JP6519979B2 - Defect inspection apparatus and defect inspection method - Google Patents

Description

  The present invention relates to a defect inspection apparatus for inspecting the presence or absence of a defect related to leakage for a container which can be filled with predetermined contents, and a defect inspection method for inspecting a container using the defect inspection apparatus, particularly The present invention relates to a defect inspection apparatus and a defect inspection method for inspecting the presence or absence of a defect by making the internal pressure of a container higher than the external pressure.

Conventionally, food, medicine, cosmetics and the like, which are required to prevent the leakage of contents, to prevent deterioration, to secure safety, etc., have been sealed in a container. In addition, defect inspection has been performed on the container in order to detect defects (leakage) such as pinholes and cracks.
In the technical field of such defect inspection, various techniques have been proposed for the purpose of improving inspection accuracy and inspection efficiency.

For example, the object of defect inspection is a pouch, and the pouch is inserted in a box-shaped regulating member having a space inside, the pressurized gas is supplied to the inside of the pouch, and the internal pressure or flow rate of the pressurized gas supply path is An apparatus has been proposed which determines the presence or absence of a leak in a pouch by measurement (see, for example, Patent Document 1).
As another technique, for example, a pouch is inserted between two regulation members which are plate members arranged in parallel at a predetermined interval, and a pressurized gas is enclosed to measure the internal pressure of the expanded pouch. An apparatus has been proposed which determines that a pouch with a low internal pressure leaks when there is a difference in the internal pressure of a plurality of pouches (see, for example, Patent Document 2).

JP, 2013-002812, A JP 2001-108568 A

However, the inspection apparatus described in Patent Documents 1 and 2 described above (hereinafter referred to as a conventional inspection apparatus) has the following problems.
The conventional inspection apparatus is directed to a pouch filled with a content such as a beverage, and the object of the inspection is to detect a defect such as a pinhole present in the pouch.
The pouch has, for example, a shape called a flat bag in which two laminated sheets are stacked and sealed at four sides by heat welding. Further, as shown in FIGS. 27 (i) and 27 (ii), the pouch includes a standing pouch 51a having a fold 53a at a bottom 52, a gusset pouch 51b having a fold 53b at a side 54, and the like.
Here, in the conventional inspection apparatus, a flat bag pouch is to be inspected, but it is desirable to inspect the presence or absence of a defective portion also for the standing pouch 51a and the gusset pouch 51b as in the case of the flat bag.
However, when the standing pouch 51a or the like is inspected using a conventional inspection apparatus, there are cases where it is not possible to detect a defective portion present in the pouch 51a, 51b.

For example, as shown in FIG. 28 (i), the standing pouch 51a is inserted between the regulating members (in the figure, two plate-like members), and the pressurized gas is enclosed inside the standing pouch 51a. I assume.
As a result, the standing pouch 51a is expanded, but in the folded portion 53a, the periphery of the fold 55 is overlapped and in close contact. In particular, when the distance between the control members is narrow, such an overlap appears prominently.
Then, if there is a defective portion on the contact surface portion which is a close contact portion of the folded portion 53a, the gas sealed in the standing pouch 51a will not leak from the defective portion to the outside. Then, the internal pressure of the standing pouch 51a does not decrease, so there is a problem that the defect portion can not be detected.

Further, when the internal pressure is increased too much when the gas is sealed in the standing pouch 51a, as shown in FIG. 28 (ii), the folding portion 53a bulges and pops out, resulting in deformation called buckling. There are times when
Such deformation should be avoided because it also causes peeling of the thermal welding at the edge of the folded portion 53a.
However, if the internal pressure of the standing pouch 51a is lowered to avoid such deformation, the amount of gas leaking from the defect portion to the outside is reduced, which results in a decrease in inspection accuracy.
Therefore, there has been a demand for a technique that can prevent the occurrence of buckling while raising the internal pressure of the standing pouch 51a to a certain value or more.

Furthermore, although the two problems described above all relate to the folding portion, for example, when there is a defective portion in the sheet on the front side or the sheet on the back side of the pouch, there are times when these defective portions can not be detected. The
For example, as shown in FIG. 28 (i), when the standing pouch 51a is inserted between two regulating members and the pressurized gas is enclosed, the sheet on the front side and the sheet on the back side of the standing pouch 51a are Each contacts the inner surface of the regulating member. Then, the front side sheet and the back side sheet are pressed by the pressurized gas in the direction toward the inner side surface of the regulating member.
Then, when there is a defective portion in the contact surface portion which is a portion in contact with the inner side surface of the regulating member among the front side sheet or the rear side sheet, the defective portion is blocked by the inner side surface of the regulating member As a result, the pressurized gas inside the standing pouch 51a does not leak from the defect portion to the outside.
As a result, the internal pressure of the standing pouch 51a does not decrease, so that the conventional inspection apparatus has a problem that the defective portion can not be detected.
This problem may occur not only in the standing pouch 51 a but also in the pouch of the flat bag and the gusset pouch 51 b.

The present invention has been proposed in view of the above circumstances, and a defective portion existing in a folded portion of a bag-like container which is an inspection object, a front side sheet or a back side sheet of the bag-like container , or an inspection object The defect which exists in the bottom of the cup-shaped container can be detected with certainty, while the deformation called buckling is avoided at the bottom of the folded-in portion of the bag-like container or the bottom of the cup-like container . An object of the present invention is to provide a defect inspection apparatus and a defect inspection method which can be improved.

In order to achieve the above object, a defect inspection apparatus according to the present invention includes a gas supply unit that supplies a gas to the inside of an inspection object, and a defect inspection unit that includes a unit that detects the presence or absence of a defect in the inspection object. The apparatus is an outer surface of the contact surface portion and the inspection object when the contact surface portion is a portion of the surface of the inspection object which is in contact with another member or a portion where the surfaces of the inspection object are in contact with each other. preparedness breathable securing means for the space is communicated or contact, breathable securing means, the surface in contact with the contact surface portion, have a rough surface of the arithmetic average roughness Ra = 1.4μm~10μm, The contact surface portion is a concave portion of the object to be inspected, the air permeability ensuring means is disposed in contact with the concave portion and pressed against the concave portion, the object to be inspected is a cup-shaped container, and the concave portion is a cup It is configured to be a bottom recessed toward the inside of the container .

The defect inspection method of the present invention is a defect inspection method including a positive pressure step of supplying a gas to the inside of the inspection object and a detection step of detecting the presence or absence of a defect in the inspection object. When a portion of the surface of the object to be in contact with another member or a portion of the surface of the object to be in contact is the contact surface portion, the contact surface portion and the space outside the object to be inspected There is a contacting step of contacting the contact surface portion with air permeability securing means for communicating or contacting, and the air permeability securing means comprises an arithmetic mean roughness Ra = 1.4 μm to 10 μm on the surface contacting the contact surface portion. of rough surfaces possess, contact surface portion is a concave portion of the object to be inspected, breathable securing means, to a position in contact with the recess, is arranged pressed against the recess, the inspection object is a cup-shaped container And the recess is the bottom recessed towards the inside of the cup-like container It is as a method.

According to the defect inspection apparatus and the defect inspection method of the present invention, the folded portion of the bag-like container which is the inspection object, the contact surface portion of the sheet on the front side or the back side of the bag-like container , or the cup which is the inspection object Since the air permeability ensuring means is brought into contact with the bottom of the container, it is possible to reliably detect the defective portion existing on the contact surface.
Further, by pressing the air-permeable securing means against the folded portion of the bag-like container which is the contact surface portion or the bottom of the cup-like container, it is possible to avoid the occurrence of deformation called buckling.
And since the occurrence of buckling is prevented in this way, the internal pressure of the bag-like container or the cup-like container which is the inspection object can be increased to a pressure suitable for defect inspection, and the inspection accuracy is improved. Can be

It is a front view which shows the structure of the defect inspection apparatus concerning 1st embodiment of this invention. It is an external appearance perspective view which shows the structure of a pouch. It is the schematic which shows the structure of a gas detection apparatus. It is a figure which shows the structure of the air permeability ensuring member which has a groove-like ventilation part, Comprising: (i) is a top view, (ii) is a left view, (iii) is a front view. It is a figure which shows the other structure of the air permeability ensuring member which has a groove-shaped ventilation part, Comprising: (i) is a top view, (ii) is a left view, (iii) is a front view. It is a figure which shows the structure of the air permeability ensuring member formed with the porous material, Comprising: (i) is a top view, (ii) is a left view, (iii) is a front view. It is a figure which shows the structure of the air permeability ensuring member which has several rod-shaped part, Comprising: (i) is a top view, (ii) is a left view, (iii) is a front view. It is a perspective view which shows the structure of the ventilation ensuring means for surfaces which has a ventilation part of a V-shaped groove. It is a perspective view which shows the structure of the ventilation ensuring means for surfaces which has a ventilation part of a square groove. It is a perspective view which shows the structure of the ventilation ensuring means for surfaces which has several convex part. It is a perspective view which shows the structure of the air permeability ensuring means for surfaces formed with the porous material. It is a front view which shows the structure of a defect inspection apparatus, Comprising: While raising a chamber lid, it is a figure which shows the state which retracted the gas supply nozzle and the air permeability ensuring member, and accommodated the to-be-tested object in the chamber main body. It is a front view which shows the structure of a defect inspection apparatus, Comprising: It is a figure which shows the state which lowered the chamber cover. It is an external view which shows the structure when the chamber of the defect inspection apparatus shown in FIG. 1 is seen from S direction. It is a front view which shows the structure of a defect inspection apparatus, Comprising: It is a figure which shows the state which vacuum-adsorbed the upper edge part of the to-be-inspected object, and raised the chamber lid. It is a front view which shows the structure of defect inspection apparatus, Comprising: It is a figure which shows the state which inserted the gas supply nozzle in the upper opening of the to-be-inspected object. It is a front view which shows the structure of a defect inspection apparatus, Comprising: It is a figure which shows the state which lowered the chamber cover. It is a front view which shows the structure of a defect inspection apparatus, Comprising: It is a figure which shows the state which enclosed the gas in the inside of a to-be-inspected object. It is a front view which shows the structure of a defect inspection apparatus, Comprising: It is a figure which shows the state which made the air permeability ensuring member approach into the folding part of a to-be-inspected object. It is an external view which shows the structure when the chamber of the defect inspection apparatus shown in FIG. 1 is seen from T direction. It is a front view which shows the structure of a defect inspection apparatus, Comprising: It is a figure which shows the state which encloses gas in the inside of a to-be-inspected object, and inspects the presence or absence of a defective part. It is the schematic which shows the structure of an optical detection means. 5 is a chart showing experimental results of Example 1; 5 is a chart showing experimental results of Example 2; It is a front view which shows the structure of the defect inspection apparatus concerning 2nd embodiment of this invention. It is a front view which shows the structure of the defect inspection apparatus concerning 3rd embodiment of this invention. It is an external appearance perspective view which shows the structure of a standing pouch and a gusset pouch. It is sectional drawing which shows the state of the pouch which was inserted between the control members and sealed gas.

The defect inspection apparatus of the present invention uses a container capable of being filled with contents such as a beverage as an inspection object, and a defect (leakage) such as a pinhole or a crack which causes leakage of the contents exists in the inspection object It is an apparatus which checks whether it is. Further, in the defect inspection apparatus according to the present invention, when a portion of the surface of the inspection object to be in contact with another member or a portion of the inspection object to be in contact with each other is a contact surface portion It is characterized in that it has ventilating means for communicating or contacting with the space outside the object to be inspected.
Hereinafter, specific embodiments of the defect inspection apparatus and the defect inspection method of the present invention will be described with reference to FIGS.

[First Embodiment of Defect Inspection Device and Defect Inspection Method]
(I) Defect Inspection Device The defect inspection device of the present embodiment is a gas that leaks from the inside of the inspection object through the defect part to the outside when the pressure inside the inspection object is higher than the external pressure. By detecting the presence or absence of a defect.
As shown in FIG. 1, the defect inspection apparatus 10A of the present embodiment includes a chamber 11, a gas supply means 12, an adsorption means 13, an exhaust means 14, a gas detection means 20, an air vent securing means 30 for a folded portion, and an air vent for the surface. A property securing means 40 is provided.

Here, the chamber 11 is a rectangular parallelepiped box, and a hollow storage space 111 having a size capable of storing the inspection object 50 is formed therein.
The chamber 11 has a chamber body 112 forming a rectangular lower half and a chamber lid 113 forming an upper half, and the chamber body 112 and the chamber lid 113 can be separated.
The chamber body 112 is a shallow bottom, tray-like member having an opening in the upper surface portion, and a predetermined horizontal surface (for example, a bottom surface inside the housing for housing the chamber 11 so that the opening is upward) Etc.).
The chamber lid 113 is a shallow bottom, tray-like member having an opening in the lower surface portion, and the chamber lid 113 is opposed to the opening of the upper surface portion of the chamber main body 112 with the opening facing downward. By mounting on the chamber main body 112, a hollow storage space 111 is formed between the chamber main body 112 and the chamber lid 113.

A chamber opening / closing means 114 for raising or lowering the chamber lid 113 is provided above the chamber lid 113.
The chamber opening / closing means 114 can be constituted by, for example, an air cylinder or the like, and the upper end of the chamber lid 113 is connected to the end of the axis of the air cylinder and the chamber lid 113 is lifted Let down.

The chamber body 112 has a rectangular plate-like bottom portion 115 and a side wall 117 erected upward from the periphery of the bottom portion 115.
Further, the chamber lid 113 has a rectangular plate-shaped upper plate portion 116 and a side wall 118 provided to stand downward from the peripheral edge of the upper plate portion 116.
An airtight holding member 119 for sealing the inside of the chamber 11 is disposed on one or both of the upper surface of the side wall 117 of the chamber body 112 and the lower surface of the side wall 118 of the chamber lid 113. For example, packing or the like can be used for the airtight holding member 119.
By disposing the airtight holding member 119 like this, in a state where the chamber lid 113 is placed on the chamber main body 112, for example, in the state shown in FIG. It can be kept sealed.

The inspection object 50 is stored in the storage space 111 of the chamber 11.
The inspection object 50 is a container that can be filled with a beverage, food, cosmetics, chemical product, etc. as its contents. However, in the present embodiment, the pouch 51 is the inspection object 50 as a representative example of the container.
The pouch 51 is a container in which a film formed of a synthetic resin such as polypropylene or polyester and an aluminum foil are laminated (laminated) and a laminate sheet (sheet 56) obtained by this processing is formed in a bag shape. .

The pouches 51 are commercially available in various shapes.
A typical example is one in which two rectangular sheets 56 are stacked so as to be stacked, and the edges are heat-welded with a predetermined width (flat bag).
In addition, there is a standing pouch 51a having a bottom portion 52 provided with a folding portion 53a folded at the bottom of the two sheets 56 while being folded in the shape of "く" toward the inside of the two sheets 56 (see FIG. 27 (i), see Figure 2). The folding portion 53a is a concave portion that functions as a gusset that connects the end portions of the two sheets 56. The standing pouch 51a can stand on its own by expanding the bottom portion 52 provided with the folding portion 53a.
Furthermore, in the pouch 51, there is a gusset pouch 51b in which a folding portion 53b is provided on the side portion 54 (see FIG. 27 (ii)). The gusset pouch 51b can increase the internal volume by expanding the side portion 54 provided with the folding portion 53b which is a concave portion.
Further, the pouch 51 is provided with a spout 57 (see FIG. 27 (ii)). The spout 57 is a cylindrical molded article formed of hard plastic or the like. The spout 57 is generally provided at the central portion of the upper edge 58 of the pouch 51, and functions as an inlet for filling the contents and an inlet for sucking the contents.

As described above, when the pouches 51 are classified according to their shapes, there are types such as flat bags, standing pouches 51a and gusset pouches 51b, and there are also pouches provided with a spout 57. The defect inspection apparatus 10A of the present embodiment can be the inspection object 50 for any of the pouches 51.
However, when performing inspection using defect inspection apparatus 10A, pouch 51 does not provide spout 57 on upper edge 58 as shown in FIG. 2 and does not heat weld upper edge 58 (as shown in FIG. Alternatively, only the right end portion and the left end portion of the upper edge portion 58 are heat-sealed), and the upper opening 59 is provided, and is stored (set) inside the chamber 11.

The gas supply means 12 is a positive pressure means for supplying a gas for inspection to the inside of the inspection object 50.
The gas supply unit 12 includes a gas supply source 121, a supply pipe 122, a gas supply nozzle 123, a nozzle drive unit 124, a valve 125, and a biasing member 126.
The gas supply source 121 compresses clean air to a predetermined pressure and supplies it. As the gas supply source 121, for example, an oilless compressor or a blower can be used. In addition, clean air means air from which dust etc. were removed by the filter etc.
The supply pipe 122 is a pipe for feeding the gas supplied from the gas supply source 121 to the inspection object 50 stored inside the chamber 11.

The gas supply nozzle 123 is for feeding the gas sent through the supply pipe 122 into the inside of the inspection object 50.
The gas supply nozzle 123 is provided outside the chamber 11 and near the side walls 117 and 118.
Further, the gas supply nozzle 123 is provided with a through hole for passing a gas. One end opening of the through hole is connected to the supply tube 122 and the other end opening is open towards the chamber 11.
Furthermore, a tubular portion 127 is provided on the surface of the gas supply nozzle 123 facing the chamber 11 so as to protrude therefrom. The tubular portion 127 has a through hole formed therein, and is inserted into the upper opening 59 of the inspection object 50 to supply the gas sent from the supply pipe 122 to the inside of the inspection object 50.

The nozzle drive means 124 moves the gas supply nozzle 123 in a direction toward the chamber 11 or in a direction away from the chamber 11. For example, an air cylinder or the like can be used as the nozzle drive means 124.
The valve 125 is provided in the middle or at the end of the supply pipe 122 and controls the flow of gas flowing inside the supply pipe 122.
The biasing member 126 biases the gas supply nozzle 123 upward. For the biasing member 126, for example, a coil spring can be used.

The adsorption means 13 opens and closes the upper opening 59 of the inspection object 50 stored in the storage space 111 of the chamber 11.
The adsorption means 13 includes through holes 131 and 132, a vacuum hose (not shown), and a vacuum pump (not shown).
The through hole 131 is the upper surface of the side wall 117a in the side wall 117a of the chamber body 112 (the side wall 117a on which the upper edge 58 of the pouch 51 is placed when the pouch 51 is placed on the bottom 115 of the chamber body 112). From the bottom to the bottom.
The through hole 132 is formed in the side wall 118a of the chamber lid 113 (the side wall 118a of the chamber lid 113 located above the side wall 117a of the chamber body 112) from the lower surface to the upper surface of the side wall 118a. It is a hole.
The vacuum pump is connected to the inside of the through hole 131 of the chamber main body 112 and the inside of the through hole 132 of the chamber lid 113 by a vacuum hose, and the inside of each of the through holes 131 and 132 is put in a vacuum state.

Specifically, the suction unit 13 having such a configuration is used in the following procedure.
The inspection object 50 is stored in the storage space 111 of the chamber 11. At this time, the upper edge 58 of the pouch 51, which is the inspection object 50, is held between the side wall 117 a of the chamber body 112 and the side wall 118 a of the chamber lid 113. That is, the upper edge 58 of the pouch 51 is positioned between the upper opening of the through hole 131 formed in the side wall 117 a of the chamber body 112 and the lower opening of the through hole 132 formed in the side wall 118 a of the chamber lid 113. To do.
When the vacuum pump is driven to evacuate the through holes 131 and 132, the upper edge 58 of the lower sheet 56 a of the two sheets 56 constituting the pouch 51 is the chamber body 112. The upper edge 58 of the sheet 56 b located on the upper side is vacuum adsorbed to the lower opening of the through hole 132 of the chamber lid 113.

  Next, when the chamber opening / closing means 114 is driven to move the chamber lid 113 upward, the upper edge portion 58 of the upper sheet 56 b of the pouch 51 is lifted in a state of vacuum suction in the through hole 132 of the chamber lid 113. On the other hand, the upper edge portion 58 of the lower sheet 56 a of the pouch 51 is fixed to the through hole 131 of the chamber main body 112 in a vacuum-adsorbed state. As a result, the pouch 51 is in the state in which the upper opening 59 is open.

  Subsequently, the tubular portion 127 of the gas supply nozzle 123 is inserted into the upper opening 59 of the pouch 51. Then, the chamber opening / closing means 114 is driven to lower the chamber lid 113. Thereby, the upper edge portion 58 of the upper sheet 56 b of the pouch 51 descends in a state of being vacuum-adsorbed to the through hole 132 of the chamber lid 113, and the upper opening 59 of the pouch 51 sandwiches the tubular portion 127 of the gas supply nozzle 123 Close in

The exhaust means 14 is for releasing the gas in the storage space 111 of the chamber 11 to the outside.
For example, when the inspection object 50 stored in the storage space 111 of the chamber 11 is expanded with positive pressure, the exhaust means 14 releases the gas in the storage space 111 of the chamber 11 to the outside.

The gas detection means 20 is a means for detecting that the gas enclosed in the inside of the inspection object 50 leaks to the outside through the defect part.
Although various apparatuses can be used for the gas detection means 20, the gas detection apparatus 21 which measures the quantity of the leaked gas can be used as an example.
As shown in FIG. 3, the gas detection device 21 includes a detection gas storage unit 211 in communication with the storage space 111 of the chamber 11 and a gas detection unit 212 in communication with the detection gas storage unit 211. .

The gas detection device 21 operates as follows. When the gas sealed in the inside of the inspection object 50 leaks from the defect portion of the inspection object 50 to the outside, the gas inside the storage space 111 of the chamber 11 moves to the detection gas storage unit 211. At this time, the amount of gas leaked from the defect portion of the inspection object 50 and the amount of gas moving from the storage space 111 of the chamber 11 to the detection gas storage portion 211 are the same.
Next, when the gas moved from the storage space 111 of the chamber 11 is stored in the detection gas storage unit 211, the gas in the detection gas storage unit 211 moves to the gas detection unit 212. At this time, the amount of gas moving from the storage space 111 of the chamber 11 to the detection gas storage unit 211 is the same as the amount of gas moving from the detection gas storage unit 211 to the gas detection unit 212.
Then, the gas detection unit 212 detects that the gas has moved. For example, a pressure gauge or a flow meter can be used for detection. Thereby, it can be detected that the inspection object 50 has a defect.
The gas detection unit 212 receives signal output means (not shown) for outputting an electrical signal when the gas moved from the detection gas storage unit 211 is detected, and the output electrical signal is input to And a determination unit (not shown) including a computer that determines the presence or absence of a defective portion at 50.

Further, in the gas detection device 21, when the gas leaks from the defect portion of the inspection object 50, the gas in the storage space 111 of the chamber 11 according to the amount of the leaked gas and immediately after the gas leaks. Moves to the detected gas storage unit 211. In practice, the gas in the storage space 111 of the chamber 11 enters the inside of the tube 213 connecting the chamber 11 and the detection gas storage unit 211, and the gas inside the tube 213 is in the detection gas storage unit 211. It flows inside.
Furthermore, when the gas inside the tube 213 flows into the inside of the detection gas storage unit 211, the gas inside the detection gas storage unit 211 is in the inside of the tube 214 connecting the detection gas storage unit 211 and the gas detection unit 212. The gas in the inside of the tube 214 flows into the gas detection unit 212.
The movement of these gases is performed instantaneously, so that test results can be obtained in a short time.

The air vent securing unit 30 for the folding portion is a space (a storage space 111 for the chamber 11) on the outer surface of the inspection object 50 of the surface of the folding portions 53a and 53b of the inspection object 50 stored in the storage space 111 of the chamber 11. Means for maintaining the air permeability for communicating with or contacting the
The folded portion air permeability ensuring means 30 includes an air permeability ensuring member 31 and a member driving means 32.

The air permeability ensuring member 31 is a member that is pressed from the outside against the folded portions 53a and 53b of the inspection object 50, and has the following three functions.
The first function is a function of expanding the folding portions 53a and 53b.
The second function is to make the surfaces of the folding portions 53 a and 53 b communicate with or contact the storage space 111 inside the chamber 11.
The third function is a function to prevent the occurrence of deformation called buckling which causes the inward portions 53a and 53b to bulge outward.

  The first function is that the inspection object 50 stored in the storage space 111 of the chamber 11 is expanded due to the gas filling, and the folded portions 53 a and 53 b overlap and adhere around the fold 55 (i.e. the inspection object In the case where the surfaces of the folded portions 53a and 53b are in contact with each other among the 50 surfaces) (see FIG. 28 (i)), when the overlapping portion is a contact surface portion, it is a contact surface portion By inserting the air permeability ensuring member 31 into the gap between the overlapping portions, the folded portions 53a and 53b are pushed and spread.

By this function, it is possible to detect a defective portion present in the folded portions 53a and 53b.
For example, in a state where the air permeability ensuring member 31 is not pressed and the peripheries of the folds 53 of the folding portions 53a and 53b overlap and adhere closely, the contact surface portion which is the overlapping portion is the storage space 111 of the chamber 11. Therefore, even if there is a defect in the contact surface, the gas enclosed in the inspection object 50 does not leak to the external storage space 111 through the defect. Can not detect leaks and can not detect defects.
On the other hand, in the state where the air-permeable securing member 31 is pressed and the folded portions 53a and 53b are spread, the gas sealed in the inside of the inspection object 50 passes through the defect portion existing in the folded portions 53a and 53b. It can leak to the external storage space 111. Thereby, the gas detection means 20 can detect a defect by detecting a leak.

However, in the case where the surface of the air permeability ensuring member 31 is a flat surface having almost no unevenness, when the air permeability ensuring member 31 is pressed against the indented portions 53a and 53b, the defective portion existing in the indented portions 53a and 53b is However, since the air permeability ensuring member 31 is pressed, the defect portion is closed from the outside. In particular, since the pressurized gas is enclosed in the inside of the inspection object 50 and the internal pressure is in a high positive pressure state, the inward parts 53 a and 53 b of the inspection object 50 are air permeable securing members 31 by the internal pressure. The closed state of the defective portion by the air permeability ensuring member 31 is maintained by being pressed toward the surface of the lower surface of the cover.
Then, even if the air-permeable securing member 31 spreads the folded portions 53a and 53b, the pressurized gas no longer leaks to the external storage space 111 through the defect portion existing in the folded portions 53a and 53b. The means 20 can not detect a defect.

Therefore, the air permeability ensuring member 31 has the second function described above. That is, the air permeability ensuring member 31 has a function of causing the surfaces of the folding portions 53 a and 53 b to communicate with or contact the storage space 111 of the chamber 11.
As a specific configuration for realizing this function, the air permeability ensuring member 31 has an air vent 33.
The venting portion 33 ventilates the surfaces of the folding portions 53a and 53b with the storage space 111 of the chamber 11 in a state where the ventilation securing member 31 pushes and spreads the folding portions 53a and 53b, or It is to be in direct contact.

As a specific example of the ventilation | gas_flowing part 33, as shown, for example to FIG. 4, FIG. 5, there exist several groove part 331 formed in the surface of the plate-shaped air permeability ensuring member 31. As shown in FIG.
The groove portion 331 is a concave portion formed in a linear or curved shape when the surface of the air permeability ensuring member 31 is viewed in plan.
A plurality of grooves 331 are formed on the surface of the air permeability ensuring member 31. The plurality of grooves 331 may or may not be disposed in parallel. If not parallel, the plurality of grooves 331 may or may not intersect. In the case of crossing, the crossing points may be a plurality of places or one place. In the case of one location, the plurality of grooves 331 may have a shape extending radially from one point.

When a plurality of grooves 331 are arranged in a line and in parallel, the longitudinal direction of the grooves 331 may be the width direction of the air permeability ensuring member 31 as shown in FIG. As shown in 5, the longitudinal direction of the air permeability ensuring member 31 (the same direction as the direction in which the air permeability ensuring member 31 is moved by the member driving means 32) may be employed. Furthermore, the longitudinal direction of the groove portion 331 may be oblique to the upper surface end of the air-permeable member 31.
Furthermore, the cross-sectional shape of the groove part 331 can be made into V shape, as shown, for example in FIG. 4, FIG. However, the cross-sectional shape of the groove portion 331 is not limited to the V-shape, and may be, for example, a U-shape or a U-shape.

As another specific example of the ventilation part 33, for example, as shown in FIG. 6, the pore 332 of the ventilation securing member 31 formed of a porous material can be mentioned.
Further, as still another specific example of the ventilation portion 33, for example, as shown in FIG. 7, a space between rod-like portions positioned between each of a plurality of rod-like portions 334 provided on the side surface of the plate-like base 333 The part 335 is mentioned.
Furthermore, as another specific example of the ventilation | gas_flowing part 33, the recessed part among the uneven | corrugated shapes of the surface when the surface of the air permeability ensuring member 31 is processed by sand blast is mentioned, for example.
Moreover, as another specific example of the ventilation | gas_flowing part 33, the uneven | corrugated shaped recessed part which is a satin finish when a satin finish process is given to the surface of the breathability ensuring member 31, for example is mentioned.

The air permeability ensuring member 31 provided with the ventilation part 33 having any one of these shapes pushes and spreads the folding parts 53a and 53b of the inspection object 50, and a defect part existing in the folding parts 53a and 53b. The gas that has leaked through can be discharged to the storage space 111 of the chamber 11 through the vent 33.
Specifically, the vent 33 functions as follows.
The air permeability ensuring member 31 contacts the outer surface of the folded portions 53a and 53b when the folded portions 53a and 53b of the inspection object 50 are spread. However, the ventilation securing member 31 is provided with the ventilation part 33, so the whole of the surface of the ventilation securing member 31 is not in contact with the outer surfaces of the folded parts 53a and 53b, and the ventilation part 33 is formed. Only the portion that is not in contact is in contact, and the portion in which the vent 33 is formed is not in contact.
Moreover, as shown in FIGS. 4-7, in the surface of the air permeability ensuring member 31, the ventilation | gas_flowing part 33 is formed densely or in the wide range. For this reason, only a very small part of the surface of the air permeability ensuring member 31 where the ventilation part 33 is not formed comes into contact with the outer side surfaces of the folded parts 53a and 53b.
In this case, the area in contact with the air permeability ensuring member 31 is reduced on the outer side surfaces of the folded portions 53a and 53b. Therefore, the possibility that the defective portion existing in the folded portions 53a and 53b is blocked by the air permeability securing member 31 is extremely reduced.
As a result, the pressurized gas sealed inside the inspection object 50 can leak to the outside through the defect portion, and the leaked gas can move to the storage space 111 of the chamber 11. Therefore, the gas detection means 20 can detect a leak and can detect a defect.

Although the rod-like portion 334 shown in FIG. 7 is formed to have a hexagonal cross section, it is not limited to a hexagonal one, and can be formed to any shape such as a square or a circle.
Further, although the number of rod-like portions 334 is five in FIG. 7, the number is not limited to five, and any number may be provided.
Furthermore, in the rod-like portion 334, the entire circumferential surface is not in contact with the indented portions 53a, 53b of the inspection object 50, but there are places such as hexagonal slopes that do not contact the indented portions 53a, 53b. This portion does not contact the folded portions 53a and 53b, and thus functions as the ventilation portion 33.
In addition, a groove may be provided in the circumferential direction on the circumferential surface of the rod-like portion 334, and the groove may be used as the ventilation portion 33.

Moreover, although the ventilation | gas_flowing part 33 makes the surface of folding part 53a, 53b, and the storage space 111 of the chamber 11 connect or contact, communication and contact differ in the following point.
For example, the surfaces of the folding portions 53a and 53b are separated from the storage space 111 of the chamber 11 by the interposition of the air permeability securing member 31, and the ventilation portion 33 ventilates the surfaces of the folding portions 53a and 53b and the storage space 111. When possible, vents 33 communicate them. On the other hand, the boundary between the chamber 11 and the storage space 111 is not necessarily clear as in the inter-rod portion space portion 335 shown in FIG. 7 as an example of the ventilation portion 33 and can be regarded as a part of the storage space 111 With regard to the ventilation portion 33, the surface of the folding portions 53a and 53b is in direct contact with the storage space 111 by the ventilation portion 33 contacting the surfaces of the folding portions 53a and 53b.
That is, when the ventilation part 33 can not be grasped as a part of the storage space 111, the expression of communication is used, and when the ventilation part 33 is regarded as a part of the storage space 111, the expression of contact is used. . However, in any case, the ventilation part 33 plays a role of connecting the surfaces of the folding parts 53 a and 53 b and the storage space 111 of the chamber 11 so as to allow air flow.

Furthermore, the air permeability ensuring member 31 has a third function. The third function is a function to prevent a situation in which the folding portions 53a and 53b of the pouch 51 bulge outward to cause deformation called buckling.
When a gas is sealed inside the pouch 51 stored in the storage space 111 of the chamber 11 and becomes positive pressure, the folded portions 53a and 53b may expand outward and a deformation called buckling may occur.
Therefore, by pressing the air permeability ensuring member 31 from the outside against the folded portions 53a and 53b, the bulging of the folded portions 53a and 53b is suppressed, and the occurrence of buckling is prevented.
And since the occurrence of buckling can be prevented as described above, the air pressure inside the pouch 51 can be increased to a desired air pressure, and a sufficient amount of gas leaking from the defect portion to the outside can be secured. Thereby, the gas detection means 20 can detect the leak in a defect part reliably. Therefore, the accuracy of defect inspection can be enhanced.

  In FIG. 1, the air permeability ensuring member 31 is disposed at a position opposed to the folding portion 53 a provided on the bottom portion 52 of the inspection object 50. However, in the case where the gusset pouch 51b in which the folded portion 53b is provided on the side portion 54 is the inspection object 50, the air permeability ensuring member 31 is disposed at a position facing the folded portion 53b.

The member driving means 32 moves the air permeability ensuring member 31 in a direction toward the chamber 11 or in a direction away from the chamber 11.
For example, an air cylinder or the like can be used as the member driving means 32.

The surface air permeability ensuring means 40 is an air permeability ensuring means for causing the surface of the inspection object 50 stored inside the chamber 11 to communicate with or contact the storage space 111 of the chamber 11 outside the inspection object 50. It is.
The surface air permeability ensuring means 40 is provided on a portion of the inner side surface of the chamber 11 where the surface of the lower sheet 56a of the inspection object 50 or the surface of the upper sheet 56b contacts. Specifically, for example, a surface air permeability ensuring unit 40 is provided on the top surface of the bottom portion 115 of the chamber main body 112 on which the inspection object 50 is placed. In addition, a surface air permeability ensuring unit 40 is provided at a portion with which the surface of the inspection object 50 expanded by the gas enclosure comes in contact, for example, the lower surface of the upper plate portion 116 of the chamber lid 113.
The surface air permeability ensuring means 40 shown in FIG. 1 is a member formed separately from the chamber 11 and in a plate or sheet shape. The surface air permeability ensuring means 40 is disposed on the upper surface of the bottom portion 115 of the chamber main body 112 and the lower surface of the upper plate portion 116 of the chamber lid 113. However, the surface breathability ensuring means 40 provided on the upper surface of the bottom 115 of the chamber body 112 may be formed directly on the upper surface of the bottom 115 as a part of the chamber body 112. In addition, the surface air permeability ensuring means 40 provided on the lower surface of the upper plate portion 116 of the chamber lid 113 may be directly formed on the lower surface of the upper plate portion 116 as a part of the chamber lid 113.

In the surface air permeability ensuring means 40, the ventilation part 42 is formed on the inspection object contact surface 41 which is at least a surface with which the inspection object 50 contacts.
In the state where the surface of the inspection object 50 is in contact with the inspection object contact surface 41 of the surface air permeability ensuring means 40, the ventilation portion 42 contacts the inspection object contact surface 41 among the surfaces of the inspection object 50. When the portion in question is a contact surface portion, the contact surface portion and the storage space 111 of the chamber 11 communicate or contact with each other.

As a specific example of the ventilation part 42, as shown in FIG. 8, the some groove part 43 formed in the to-be-tested object contact surface 41 of the plate-like or sheet-like air permeability ensuring means 40 for surfaces is mentioned, for example.
The groove portion 43 is a concave portion formed in a linear shape or a curved shape when the inspection object contact surface 41 is viewed in plan.
A plurality of grooves 43 are formed in the inspection object contact surface 41. The plurality of grooves 43 may be arranged in parallel or may not be parallel. If not parallel, the plurality of grooves 43 may or may not intersect. In the case of crossing, the crossing points may be a plurality of places or one place. In the case of one location, the plurality of grooves 43 may have a shape extending radially from one point.
In addition, the length of the linear or curved groove portion 43 is preferably longer. In particular, one end of the linear portion or the like reaches one end side of the surface air permeability securing means 40, the linear portion or the like It is desirable for the other end to reach the other end of the surface air permeability ensuring means 40. With such a length, the entire surface of the groove 43 is not covered by the expanded surface of the test object 50, so that the surface of the test object 50 and the storage space 111 of the chamber 11 can be communicated. Thus, the gas leaked from the defect portion of the inspection object 50 can be detected by the gas detection means 20.

Furthermore, although the groove 43 shown in FIG. 8 has a V-shaped cross section, the groove 43 is not limited to the V-shape, and may be, for example, a wedge (see FIG. 9), or It may be U-shaped or the like.
In addition, although a projecting portion 44 is formed between each of the plurality of grooves 43 (see FIGS. 8 and 9), the sectional shape of the projecting portion 44 may be triangular as shown in FIG. Alternatively, it may be rectangular as shown in FIG. In addition, the cross-sectional shape of the protruding portion 44 may be, for example, a trapezoidal shape, a polygonal shape, a semicircular shape, an arch shape, or the like. However, since it is preferable to minimize the contact area between the test object contact surface 41 of the surface air permeability ensuring means 40 and the surface of the test object 50 as much as possible, the shape of the protruding tip of the protruding portion 44 is It is desirable that the shape is in the shape of a bowl or a semicircle.

Further, as another specific example of the ventilation portion 42, for example, as shown in FIG. 10, a plurality of convex portions 45 projecting in a parabolic shape are formed on the test object contact surface 41 of the surface air permeability ensuring means 40. The concave portion 46 located between the plurality of convex portions 45 can be used as the ventilation portion 42.
Furthermore, as another specific example of the ventilation part 42, for example, as shown in FIG. 11, the pores 47 of the surface air permeability ensuring means 40 formed of a porous material can be mentioned.
Moreover, as another specific example of the ventilation part 42, the recessed part in the uneven | corrugated shape of the surface when the surface of the air permeability ensuring means 40 for surfaces is processed by sandblasting is mentioned, for example.
Furthermore, as another specific example of the ventilation part 42, for example, there is a concave-convex shaped concave part which is a satin finish when the surface of the surface breathability securing means 40 is finished with the satin finish.
When the vent portion 42 is the groove portion 43 or the concave portion 46, the width and the depth of the vent portion 42 are determined so that the surface of the inspection object 50 in contact with the vent portion 42 enters the vent portion 42. It is desirable to decide accordingly. That is, a gas is sealed in the inspection object 50 stored inside the chamber 11 and expanded, and the surface of the inspection object 50 comes into contact with the inspection object contact surface 41 of the surface air permeability ensuring means 40 and the ventilation portion The width and the depth of one vent portion 42 are determined to such an extent that a space is secured between the inner side surface of the vent portion 42 and the surface of the inspection object 50 when entering into the inside of 42. Is desirable.

The surface breathability ensuring means 40 provided with the vent portion 42 having any of these shapes ventilates the gas that has leaked to the outside through the defect portion existing on the surface of the inspection object 50. It can be discharged to the storage space 111 of the chamber 11 through the portion 42.
Specifically, the ventilation unit 42 functions as follows.
The inspection object 50 stored in the storage space 111 of the chamber 11 has the surface of the lower sheet 56 a on the inspection object contact surface 41 of the surface air permeability ensuring means 40 disposed on the upper surface of the bottom portion 115 of the chamber main body 112. Contact In addition, when gas is sealed in the inside of the inspection object 50, the inspection object 50 expands and the inspection of the surface air permeability ensuring means 40 whose surface is disposed on the lower surface of the upper plate portion 116 of the chamber lid 113. Contact the object contact surface 41; Here, since the ventilation portion 42 is formed on the inspection object contact surface 41 of the surface air permeability ensuring means 40, the inspection object contact surface 41 is in contact with the entire surface of the inspection object 50. Instead, the portion where the ventilation portion 42 is formed will not come in contact with the surface of the inspection object 50.
Moreover, as shown in FIG. 8 to FIG. 11, in the inspection object contact surface 41, the plurality of ventilation parts 42 are formed densely and in a wide range. As a result, only a very small portion of the inspection object contact surface 41 where the ventilation portion 42 is not formed comes into contact with the surface of the inspection object 50.
Then, on the surface of the inspection object 50, the area in contact with the inspection object contact surface 41 is reduced, so that the defect portion existing on the surface of the inspection object 50 is blocked by the surface air permeability ensuring means 40. There is very little chance of being
Therefore, the pressurized gas can leak to the outside through the defect portion, and the gas can move to the storage space 111 of the chamber 11, so that the gas detection means 20 can detect the leak in the defect portion and the defect You can detect parts.

(II) Defect Inspection Method Next, a defect inspection method according to the present embodiment will be described with reference to FIGS.
The defect inspection method of the present embodiment is a method of inspecting the presence or absence of a defect in the inspection object 50 using the defect inspection apparatus 10A having the above configuration.
In FIGS. 12 to 21, the gas supply means 12 and the gas detection means 20 are omitted for the sake of convenience of the description.
Moreover, in this defect inspection method, the case where the standing pouch 51a is the inspection object 50 will be described.

First, the defect inspection apparatus 10A in a state in which the standing pouch 51a which is the inspection object 50 is not stored in the storage space 111 of the chamber 11 is prepared.
At this time, the chamber lid 113 is placed on the chamber body 112.

Next, the chamber opening / closing means 114 is driven to move the chamber lid 113 upward. As a result, the chamber lid 113 is separated from the chamber body 112 and lifted upward, the storage space 111 of the chamber 11 communicates with the outside of the chamber 11, and the inside of the chamber body 112 is open.
In addition, when the chamber cover 113 is lifted upward, the downward pressing of the gas supply nozzle 123 of the gas supply means 12 received from the chamber cover 113 is released. Therefore, the gas supply nozzle 123 is lifted upward by a predetermined height by the biasing by the biasing member 126.

Next, the gas supply nozzle 123 is moved in a direction (horizontal direction) away from the chamber 11 by driving the nozzle drive means 124.
Subsequently, by driving the member driving means 32, the air permeability ensuring member 31 of the air permeability ensuring means 30 for the folding portion is moved in a direction (horizontal direction) away from the chamber 11.
By going through these steps, the gas supply nozzle 123 and the air permeability ensuring member 31 are not positioned above the chamber body 112, and the chamber lid 113 is positioned at a distance from the chamber body 112. You will come to As a result, the upper side of the bottom 115 of the chamber body 112 is opened (see FIG. 12).

On the upper surface of the bottom portion 115 of the chamber main body 112, a surface air permeability ensuring means 40 is attached. The inspection object 50 is placed on the inspection object contact surface 41 which is the upper surface of the surface air permeability ensuring means 40.
At this time, the standing pouch 51a (hereinafter simply referred to as the pouch 51), which is the inspection object 50, is kept horizontal, and the sheet 56 located on the lower side of the two sheets 56 constituting the pouch 51 is the lower sheet 56a. Then, the pouch 51 is placed on the test object contact surface 41 with the surface of the lower sheet 56 a facing the test object contact surface 41 of the surface air-permeable securing means 40.
Further, the upper edge portion 58 of the pouch 51 is placed on the upper surface of the side wall 117 a (the side wall 117 a of the side wall 117 closer to the gas supply nozzle 123) of the chamber main body 112. At this time, the upper opening of the through hole 131 formed in the side wall 117 a of the chamber body 112 is closed by the upper edge 58 of the pouch 51.

Then, the chamber opening / closing means 114 is driven to move the chamber lid 113 downward (see FIG. 13). Thus, the chamber lid 113 is placed on the chamber body 112.
Subsequently, the vacuum pump (not shown) of the suction unit 13 is driven. As a result, the inside of the through hole 131 of the chamber body 112 is in a vacuum state, and the upper edge portion 58 of the lower sheet 56 a of the pouch 51 is vacuum adsorbed. Further, the inside of the through hole 132 of the chamber lid 113 is in a vacuum state, and the upper edge portion 58 of the upper sheet 56 b of the pouch 51 is vacuum adsorbed.
Here, on the upper surface of the side wall 117a of the chamber body 112, a recess 16a is formed having a shape in which the upper edge 58 of the lower sheet 56a of the pouch 51 and the lower half of the tubular portion 127 of the gas supply nozzle 123 are accommodated. (See Figure 14). Further, on the lower surface of the side wall 118a of the chamber lid 113, a concave portion 16b is formed in which the upper edge portion 58 of the upper sheet 56b of the pouch 51 and the upper half portion of the tubular portion 127 of the gas supply nozzle 123 are accommodated.
Then, in the recess 16a of the chamber body 112, of the portion where the upper edge 58 of the lower sheet 56a of the pouch 51 fits, the vicinity of the portion where the lower half of the tubular portion 127 of the gas supply nozzle 123 fits (in FIG. An upper surface opening of the through hole 131 is formed on the right side and the left side of the portion in which the lower half of the tubular portion 127 of the gas supply nozzle 123 is accommodated. Further, of the portion where the upper edge portion 58 of the upper sheet 56b of the pouch 51 fits in the recess 16b of the chamber lid 113, the vicinity of the portion where the upper half of the tubular portion 127 of the gas supply nozzle 123 fits (in FIG. The lower surface opening of the through hole 132 is formed on the right side and the left side of the portion in which the upper half of the tubular portion 127 of the supply nozzle 123 is accommodated. Furthermore, a portion in which the lower half of the tubular portion 127 of the gas supply nozzle 123 is accommodated in the recess 16a of the chamber body 112, and a portion in which the upper half of the tubular portion 127 of the gas supply nozzle 123 is accommodated in the recess 16b of the chamber lid 113 And a substantially circular opening, which is formed by

Then, the chamber opening / closing means 114 is driven to raise the chamber lid 113 (see FIG. 15). As a result, the chamber lid 113 is separated from the chamber body 112 and lifted upward.
At this time, the upper edge 58 of the lower sheet 56a of the pouch 51 is vacuum-adsorbed by the through hole 131 of the chamber main body 112, and therefore does not move upward and is fixed on the upper surface of the side wall 117a of the chamber main body 112 Be done.
On the other hand, since the upper edge portion 58 of the upper sheet 56 b of the pouch 51 is vacuum-adsorbed by the through hole 132 of the chamber lid 113, it moves upward as the chamber lid 113 rises.
As a result, the upper edge 58 of the lower sheet 56a of the pouch 51 and the upper edge 58 of the upper sheet 56b are separated, and the upper opening 59 of the pouch 51 is largely opened.

  Subsequently, the gas supply nozzle 123 is moved in a direction (horizontal direction) close to the chamber 11 by driving the nozzle drive means 124 (see FIG. 16). Thereby, the tubular portion 127 formed in the gas supply nozzle 123 is inserted into the inside of the upper opening 59 of the pouch 51.

Subsequently, the chamber opening / closing means 114 is driven to lower the chamber lid 113 (see FIG. 17).
At this time, the side wall 118a of the chamber cover 113 is also lowered as the chamber cover 113 is lowered, but since the tubular portion 127 of the gas supply nozzle 123 is located below the side wall 118a, the side wall 118a is a gas It descends while pushing down the tubular portion 127 of the supply nozzle 123. As a result, the entire gas supply nozzle 123 is pushed downward, which is the direction opposite to the upward biasing direction by the biasing member 126.

The lowered chamber lid 113 is placed on the chamber body 112.
The tubular portion 127 of the gas supply nozzle 123 is inserted between the upper edge 58 of the lower sheet 56 a of the pouch 51 and the upper edge 58 of the upper sheet 56 b in a state of being inserted inside the upper opening 59 of the pouch 51. It is caught in between. The upper edge 58 of the lower sheet 56 a and the upper edge 58 of the upper sheet 56 b of the pouch 51 are sandwiched between the upper surface of the side wall 117 a of the chamber body 112 and the lower surface of the side wall 118 a of the chamber lid 113. It becomes.

Furthermore, when the upper opening 59 of the pouch 51 into which the tubular portion 127 of the gas supply nozzle 123 is inserted is closed, the pouch 51 is sealed.
However, here, the chamber lid 113 is not completely closed with respect to the chamber body 112, but the pouch 51 is closed so as to be able to hold the pouch 51 in a sealed state. This is because gas can be supplied to the inside of the pouch 51 and, thereafter, the air permeability ensuring member 31 of the air permeability ensuring means 30 for the folding portion is made to enter the storage space 111 of the chamber 11.
In order to realize such closing of the chamber lid 113, the airtight holding member 119 (packing) provided on the upper surface of the side wall 117 of the chamber body 112 and the airtight holding member provided on the lower surface of the side wall 118 of the chamber lid 113. 119 (Packing) should be thickened.

Then, the valve 125 (see FIG. 1) of the gas supply means 12 is opened and the pressurized gas discharged from the gas supply source 121 is introduced into the pouch 51 through the tubular portion 127 of the gas supply nozzle 123. Supply (see FIG. 18).
Thereby, the pouch 51 is inflated under positive pressure.
In the pouch 51, the end of the folded portion 53a (the connected portion between the folded portion 53a and the lower sheet 56a and the connected portion between the folded portion 53a and the upper sheet 56b) spreads in the vertical direction as the pouch 51 expands. , Will be open. The distance between the connecting portion of the folded portion 53a and the lower sheet 56a and the connecting portion of the folded portion 53a and the upper sheet 56b is higher than the thickness (height in the vertical direction) of the air permeability ensuring member 31. Keep it.

Subsequently, by driving the member driving means 32, the air permeability ensuring member 31 of the folded portion air permeability ensuring means 30 is moved in a direction (horizontal direction) close to the chamber 11 (see FIG. 19). Then, the air permeability ensuring member 31 enters the storage space 111 through the second opening 16 d (see FIGS. 18 and 20) formed between the side walls 117 and 118 of the chamber 11 for passing the air permeability ensuring member 31. Let Furthermore, a contact step is performed in which the air permeability ensuring member 31 is advanced between the folded portions 53a overlapping each other and disposed in a state of being in contact with the outer surface of the folded portion 53a.
As a result, the folded portions 53a are in a state in which the outer side surfaces that are in close contact with each other are separated and pushed apart.

  Then, the chamber opening / closing means 114 is driven to press the chamber lid 113 downward, and the chamber lid 113 is completely closed with respect to the chamber body 112. At this time, the airtight holding member 119 of the chamber body 112 and the airtight holding member 119 of the chamber lid 113 are crushed to make the chamber 11 in a sealed state.

Further, a positive pressure process of supplying the pressurized gas discharged from the gas supply source 121 (see FIG. 1) further to the inside of the pouch 51 through the tubular portion 127 of the gas supply nozzle 123 is performed (see FIG. 21).
Thus, when the pouch 51 has a defect, the gas supplied to the inside of the pouch 51 leaks to the storage space 111 of the chamber 11 through the defect.
Further, when the folded portion 53a of the pouch 51 has a defective portion, the gas supplied to the inside of the pouch 51 passes through the defective portion, and the ventilating portion 33 of the air permeability ensuring member 31 of the breathable portion securing means 30 for the folded portion. Leak to the storage space 111 of the chamber 11.

Furthermore, in the pouch 51 in which the internal pressure is positive, the surface of the lower sheet 56a is in contact with the upper surface of the air-permeable surface securing means 40 provided in the chamber body 112, and the surface of the upper sheet 56b is It contacts the lower surface of the surface air permeability ensuring means 40 provided on the chamber lid 113.
Thereby, when a portion in contact with the surface air permeability ensuring means 40 in the lower sheet 56a and the upper sheet 56b of the pouch 51 is the contact surface portion, when there is a defective portion in the contact surface portion, the pouch 51 The gas supplied to the inside of the chamber leaks to the storage space 111 of the chamber 11 through the defect portion, through the vent portion 42 of the surface air permeability ensuring means 40.
And the gas detection means 20 detects a leak, and performs the detection process which detects that the pouch 51 has a defect.

Thus, the presence or absence of a defect in the inspection object 50 can be inspected by implementing the defect inspection method of the present embodiment.
In addition, when gas is sealed in the inside of the pouch 51 which is the inspection object 50 stored in the storage space 111 of the chamber 11, the folding portion 53 a of the pouch 51 may overlap and adhere around the fold 55. The folded portion 53a can be pushed apart by pressing the air permeability ensuring member 31 of the air permeability ensuring means 30 for the folded portion from the outside of the contact surface portion which is the close contact portion of the folded portion 53a.
And, even when there is a defective portion in the folded portion 53a, the ventilating portion 33 is formed in the breathable securing member 31, so the gas leaking from the defective portion to the outside passes through the ventilating portion 33 and the storage space of the chamber 11 Since the gas is discharged to 111, the leak at the defective portion can be detected by the gas detection means 20.

  Furthermore, even when there is a defective portion in the contact surface portion of the lower sheet 56a or the upper sheet 56b of the pouch 51 that contacts the surface air permeability ensuring means 40, the air permeability portion 42 is formed in the surface air permeability ensuring means 40 Since the gas leaked to the outside from the defect portion is discharged to the storage space 111 of the chamber 11 through the vent portion 42, the gas detection means 20 can detect the leak at the defect portion.

In addition, since the air-permeable member 31 is pressed from the outside to the folding portion 53a of the pouch 51, the folding portion 53a does not bulge outward even when the pouch 51 is positively pressurized, and is referred to as buckling. There is no deformation. For this reason, the air pressure inside the pouch 51 can be increased to a desired air pressure, and the amount of gas leaking from the defect portion can be secured sufficiently, so that the gas detection means 20 can reliably detect the leak, and thereby the defect inspection Accuracy can be increased.
Moreover, since the chamber 11 accommodates the whole to-be-tested object 50, the presence or absence of a defect can be test | inspected with respect to the to-be-tested object 50 whole.

  In the defect inspection method of the present embodiment, the case where the standing pouch 51a is the inspection object 50 has been described, but the inspection object 50 is not limited to the standing pouch 51a, and the gusset pouch 51b or flat bag is used. It may be a pouch 51.

(III) Gas Detection Means The defect inspection apparatus 10A shown in FIG. 1 includes the gas detection device 21 having the configuration shown in FIG.
However, the gas detection means 20 is not limited to the gas detection device 21. For example, the optical detection means 22 having the configuration shown in FIG. 22 can be used.

(Optical detection means)
The optical detection means 22 is a means for detecting the gas pushed out from the detection gas storage unit 211 using the Schlieren method.
Specifically, the optical detection means 22 includes a light source 221, a first lens 222, a second lens 223, a nozzle 224, a knife edge 225, and an observation means 226.
The light source 221 emits light.
The first lens 222 collimates the light from the light source 221 into a parallel light flux.
The second lens 223 condenses the parallel luminous flux.
The nozzle 224 sends the gas pushed out from the detection gas storage unit 211 to the parallel luminous flux as a detection gas.
The knife edge 225 partially blocks the light source image.
The observation means 226 forms an image of the light source and observes the distribution of refraction in the parallel light flux.
By using the optical detection means 22 having such a configuration as the gas detection means 20, the gas pushed out from the detection gas storage unit 211 is visualized as the distribution of the refractive index in the parallel light flux, and detected accurately. Can.

  Here, as the detection gas, a gas having a refractive index different from that of the atmosphere inside the optical detection means 22 is used.

In addition, the temperature of the detection gas may be controlled so that the atmosphere and the refractive index inside the optical detection means 22 are different.
Temperature control can be realized by providing a heating unit such as a heater or a cooling unit such as a Peltier device or a water cooler in the detected gas storage unit 211.
By adjusting the temperature, the difference between the refractive index of the detection gas and the refractive index of the atmosphere inside the optical detection means 22 can be easily increased, so that the detection performance can be improved.
Further, for example, air can be used as the gas supplied to the inside of the inspection object 50, the gas in the storage space 111 of the chamber 11, and the gas in the detection gas storage unit 211. By using air, it is not necessary to use an expensive gas such as helium, which can reduce the running cost.
The optical detection means 22 is configured to perform the Schlieren method, but is not limited to this. For example, the optical detection means 22 may be configured to perform the shadow graph method, the Mach-Zehnder method, or the like.

(Diaphragm)
The detection gas storage unit 211 can be provided with a diaphragm as a partition member.
The diaphragm is a partition plate for dividing the detection gas storage unit 211 into the upstream side and the downstream side, and has flexibility. When the gas from the storage space 111 of the chamber 11 flows to the upstream side of the detection gas storage unit 211, the diaphragm is deformed to the downstream side according to substantially the same volume.
By providing the diaphragm, the gas sealed in the detection gas storage unit 211 and the gas detection unit 212 can be different from the gas in the storage space 111 of the chamber 11. For example, the former gas can be carbon dioxide and the latter gas can be ordinary air.
Since the carbon dioxide and the air are separated by the diaphragm, it is possible to avoid the problem that the concentration of carbon dioxide does not decrease inside the detection gas storage unit 211 and the refractive index fluctuates.

Further, by providing the diaphragm, even when the gas enclosed in the detection gas storage unit 211 and the gas detection unit 212 and the gas in the storage space 111 of the chamber 11 are different, mixing can be prevented. Therefore, the degree of freedom in gas selection can be increased, and usability and the like can be improved.
In addition to the diaphragm, for example, a bellows-like sheet (not shown) may be used as the partition member.

(IV) Examples Hereinafter, the present invention will be described in more detail by way of specific examples.

(IV-1) Example 1
As a defect inspection apparatus, a defect inspection apparatus 10A provided with the configuration shown in FIG. 1 was prepared.
Moreover, as the gas detection means 20, the optical detection means 22 (Shrelin apparatus) provided with the structure shown in FIG. 22 was used.

An aluminum plate material (aluminum A5052P (JIS standard H4000)) having a thickness of 5 mm was used as the air permeability ensuring member 31 of the air permeability ensuring means 30 for the folding portion.
Two sheets of this ventilation securing member 31 were prepared. In one of the two sheets, the aeration portion 33 was not processed on the surface, and the surface roughness was set to arithmetic average roughness Ra = 0.2 μm. In the other case, the surface was textured, and the concavo-convex concave portion, which is a textured surface, was used as the ventilation portion 33, and the surface roughness was Ra = 10 μm.
The distance between the upper surface of the surface air permeability ensuring means 40 provided on the upper surface of the bottom portion 115 of the chamber main body 112 and the lower surface of the surface air permeability ensuring means 40 provided on the lower surface of the upper plate portion 116 of the chamber lid 113 is , 7 mm.

The to-be-tested object 50 prepared the standing pouch 51a as a sample.
Further, in the folded portion 53a of the standing pouch 51a, a pinhole with a diameter of 100 μm was formed at one place as a pseudo defect.

After preparing the defect inspection apparatus 10A and the inspection object 50, an experiment was conducted with the contents of the “(II) defect inspection method” described above.
In addition, experiments were conducted for the following three cases.
(I) When the air permeability ensuring member 31 is not pushed into the folding portion 53a of the standing pouch 51a ("no pressing of the air permeability ensuring member 31" shown in FIG. 23)
(Ii) When the air permeability ensuring member 31 whose surface roughness is Ra = 0.2 μm is pushed into the folding portion 53a of the standing pouch 51a (“the air permeability ensuring member 31 has a depression (surface not shown in FIG. 23) Ra = 0.2 μm) ”)
(Iii) When the air permeability ensuring member 31 whose surface roughness is Ra = 10 μm is pushed into the folding portion 53a of the standing pouch 51a ("the air permeability ensuring member 31 is pressed (surface finish processing Ra = shown in FIG. 10 μm) ")
In any of these (i) to (iii), the gas supplied from the gas supply means 12 to the inside of the inspection object 50 is air, and the pressure is 10 kPa.

The results of the experiment are shown in FIG.
As shown in the figure, in the case of (i), a defect (pinhole) present in the folded portion 53a of the standing pouch 51a was not detected.
This is because in the folding portion 53a of the standing pouch 51a, the periphery of the fold 55 is laminated and closely attached, the pinhole is closed in the laminated folding portion 53a, and the gas enclosed inside the standing pouch 51a leaks from the pinhole It is thought that it is because it became impossible state.

Also in the case of (ii), no defect (pinhole) was detected.
This is because the air permeability ensuring member 31 is pushed into the folding portion 53a of the standing pouch 51a, so that the circumference of the fold 55 can be expanded, and the tightness of the folding portions 53a can be eliminated, but the folded air permeability is secured Since the surface roughness of the member 31 is fine, the surface of the air permeability ensuring member 31 and the surface of the folding portion 53a are in close contact with each other, the pinhole is closed by the surface of the air permeability ensuring member 31, and inside the standing pouch 51a. It is considered that this is because the sealed gas can not leak from the pinhole to the outside.

In the case of (iii), a defect (pinhole) was detected.
This is because the air tightness securing member 31 is pushed into the folding portion 53a of the standing pouch 51a to cancel the close contact state around the fold 55, and the surface roughness of the air tightness securing member 31 pushed in is rough. The surface of the air permeability ensuring member 31 has a concavo-convex shape, and the concave portion of the concavo-convex shape is not in close contact with the surface of the folding portion 53a as the aeration portion 33, thereby avoiding blocking of the pinhole and standing pouch 51a. It is considered that the gas sealed inside is leaked to the external storage space 111 through the pinhole.

(IV-2) Example 2
As a defect inspection apparatus, a defect inspection apparatus 10A provided with the configuration shown in FIG. 1 was prepared. Moreover, as the gas detection means 20, the optical detection means 22 (Shrelin apparatus) provided with the structure shown in FIG. 22 was used.
The distance between the upper surface of the surface air permeability ensuring means 40 provided on the upper surface of the bottom portion 115 of the chamber main body 112 and the lower surface of the surface air permeability ensuring means 40 provided on the lower surface of the upper plate portion 116 of the chamber lid 113 is , 7 mm.

An aluminum plate material (aluminum A5052P (JIS standard H4000)) having a thickness of 5 mm was used as the air permeability ensuring member 31 of the air permeability ensuring means 30 for the folding portion.
Four sheets of this ventilation securing member 31 were prepared. In one of the four sheets, the aeration portion 33 was not processed on the surface, and the surface roughness was set to arithmetic average roughness Ra = 0.2 μm. In the other case, the surface was sandblasted, the surface roughness was Ra = 1.4 μm, and the concave and convex portion on the surface was used as the ventilation portion 33. In the other case, the surface was textured by etching and the surface roughness was set to Ra = 4.6 μm, and the concavo-convex concave portion, which is a textured surface, was used as the ventilation portion 33. Furthermore, the other sheet was given a satin finish by etching on the surface, the surface roughness was Ra = 10 μm, and the concavo-convex concave portion having a satin finish was used as the ventilation portion 33.
The surface roughness of each of the four air permeability ensuring members 31 was measured using a surface roughness and contour shape measuring machine (Surfcom 2000 SD3 (Surfcom is a registered trademark)) manufactured by Tokyo Seimitsu Co., Ltd.

The to-be-tested object 50 prepared the standing pouch 51a as a sample.
Further, in the folded portion 53a of the standing pouch 51a, a pinhole with a diameter of 100 μm was formed at one place as a pseudo defect.

After preparing the defect inspection apparatus 10A and the inspection object 50, an experiment was conducted with the contents of the “(II) defect inspection method” described above.
Moreover, in this experiment, the air permeability ensuring member 31 of 4 sheets mentioned above was prepared beforehand, and 1 sheet was attached to defect inspection apparatus 10A, and the said experiment was done. And it verified whether a defective part (pin hole) was able to be detected about each of four sheets of air permeability securing members 31.
In addition, also when using any of the four air permeability ensuring members 31, the gas supplied to the inside of the to-be-inspected object 50 from the gas supply means 12 was made into air, and the pressure was 10 kPa.

The results of the experiment are shown in FIG.
As shown in (i) of the figure, in the case of using the air permeability ensuring member 31 having a surface roughness Ra of 0.2 μm, a defective portion (pinhole) present in the folded portion 53a of the standing pouch 51a is detected. It was not.
This is because the air permeability ensuring member 31 is pushed into the folding portion 53a of the standing pouch 51a, so that the circumference of the fold 55 can be expanded, and the tightness of the folding portions 53a can be eliminated, but the folded air permeability is secured Since the surface roughness of the member 31 is fine, the surface of the air permeability ensuring member 31 and the surface of the folding portion 53a are in close contact with each other, the pinhole is closed by the surface of the air permeability ensuring member 31, and inside the standing pouch 51a. It is considered that this is because the sealed gas can not leak from the pinhole to the outside.

On the other hand, as shown in the figures (ii) to (iv), when the air permeability ensuring member 31 having a surface roughness Ra of 1.4 μm, Ra of 4.6 μm and Ra of 10 μm is used, any defects are obtained. Part (pinhole) was detected.
This is because the air tightness securing member 31 is pushed into the folding portion 53a of the standing pouch 51a to cancel the close contact state around the fold 55, and the surface roughness of the air tightness securing member 31 pushed in is rough. The surface of the air permeability ensuring member 31 has a concavo-convex shape, and the concave portion of the concavo-convex shape is not in close contact with the surface of the folding portion 53a as the aeration portion 33, thereby avoiding blocking of the pinhole and standing pouch 51a. It is considered that the gas sealed inside is leaked to the external storage space 111 through the pinhole.
From the results of this experiment, it was found that the surface roughness of the air permeability ensuring member 31 should be at least Ra = 1.4 μm or more.

Second Embodiment of Defect Inspection Device and Defect Inspection Method
Next, a second embodiment of the defect inspection apparatus and defect inspection method of the present invention will be described with reference to FIG.
The figure is a front view which shows the structure of the defect inspection apparatus of this embodiment.
The present embodiment is different from the first embodiment in the inspection object and in the configuration of the defect inspection apparatus based on the difference of the inspection object. That is, in the first embodiment, the object to be inspected is a pouch having an opening at the upper edge, whereas in the present embodiment, the object to be inspected thermally welds all the edges including the upper edge. It differs in that it is a sealed pouch. In the first embodiment, the defect inspection apparatus includes the gas supply unit, whereas in the present embodiment, the defect inspection apparatus includes a vacuum unit for evacuating the storage space of the chamber. It differs in that it is equipped and does not have gas supply means. Furthermore, a pressure gauge or a helium leak detector can be used as the gas detection means. When using a helium leak detector, the inside of the sealed pouch is pre-filled with helium. Other components are the same as in the first embodiment.
Therefore, in FIG. 25, the same components as in FIG. 1 will be assigned the same reference numerals and detailed explanations thereof will be omitted.

As shown in FIG. 25, the defect inspection apparatus 10B of the present embodiment includes the chamber 11, the exhaust means 14, the gas detection means 20, the air vent securing means 30 for the folded portion, the air vent securing means 40 for the surface, and the vacuum means 15. Have.
Here, the vacuum means 15 is a positive pressure means for relatively making the inside of the inspection object 50 have a positive pressure by bringing the storage space 111 of the chamber 11 into a vacuum state.
The vacuum unit 15 includes a vacuum pump 151, a vacuum pipe 152, and a valve 153.
The vacuum pump 151 is connected to the storage space 111 of the chamber 11 by a vacuum pipe 152, and evacuates the inside of the storage space 111.
The valve 153 is provided in the middle or at the end of the vacuum pipe 152, and controls the discharge of gas inside the storage space 111 by the vacuum pump 151.

The air vent securing unit 30 for the folding portion is a space (a storage space 111 for the chamber 11) on the outer surface of the inspection object 50 of the surface of the folding portions 53a and 53b of the inspection object 50 stored in the storage space 111 of the chamber 11. Means for maintaining the air permeability for communicating with or contacting the
The folded portion air permeability ensuring means 30 is provided with the air permeability ensuring member 31. The air permeability ensuring member 31 is fixed to the side wall 117 of the chamber main body 112. In other words, the air vent securing means 30 for the folding portion does not have a member driving means. This is because after the storage space 111 of the chamber 11 is in a vacuum state, it is difficult to allow the air permeability ensuring member 31 to enter the storage space 111 while maintaining the vacuum state.

The target of the defect inspection performed using the defect inspection apparatus 10B is a sealed pouch 51c in which all the edges are sealed by heat welding.
The sealed pouch 51c may be any of a flat bag, a standing pouch 51a, and a gusset pouch 51b. Also, the spout 57 may be attached or may not be attached.

The defect inspection method performed using the defect inspection apparatus 10B is performed in the following procedure.
In addition, what made the standing pouch 51a the sealed pouch 51c is made into the to-be-tested object 50 here.

The defect inspection apparatus 10B in a state in which the inspection object 50 is not stored in the storage space 111 of the chamber 11 is prepared.
At this time, the chamber lid 113 is placed on the chamber body 112.
The chamber opening / closing means 114 is driven to raise the chamber lid 113. As a result, the chamber lid 113 is separated from the chamber body 112 and lifted upward, the storage space 111 of the chamber 11 communicates with the outside of the chamber 11, and the inside of the chamber body 112 is exposed and open.

Next, the inspection object 50 (a standing pouch 51a which is a sealed pouch 51c) is placed on the surface air-permeable securing means 40 provided on the upper surface of the bottom portion 115 of the chamber main body 112.
At this time, the standing pouch 51a is placed on the surface air permeability ensuring means 40 in a state where the air permeability ensuring member 31 is inserted into the folding portion 53a of the standing pouch 51a. As a result, the air permeability ensuring member 31 is disposed in contact with the folded portion 53a of the standing pouch 51a (contacting step).

  Subsequently, the chamber opening / closing means 114 is driven to lower the chamber lid 113. Thus, the chamber lid 113 is placed on the chamber body 112. Then, the storage space 111 of the chamber 11 is sealed.

Then, the vacuum pump 151 of the vacuum unit 15 is driven. As a result, the storage space 111 of the chamber body 112 is in a vacuum state (positive pressure step), and the standing pouch 51a is expanded.
At this time, the surface of the lower sheet 56a of the standing pouch 51a is in contact with the upper surface of the air-permeable securing means 40 for the surface of the chamber body 112, and the surface of the upper sheet 56b of the standing pouch 51a is for the surface of the chamber lid 113. It contacts the lower surface of the ventilation securing means 40.
Further, in the folded portion 53a of the standing pouch 51a, since the air-permeable securing member 31 is inserted, the periphery of the fold 55 does not overlap and is spread.

Furthermore, after the vacuum pump 151 of the vacuum means 15 is driven to reduce the pressure (vacuum degree) of the storage space 111 to a predetermined pressure, the valve 153 is closed. As a result, when there is a defect in the standing pouch 51a, the gas inside the standing pouch 51a that has become positive pressure leaks from the defect into the external storage space 111.
The gas detection means 20 detects the leak to detect that the standing pouch 51a has a defect (detection step).

  Further, even when there is a defective portion on the contact surface portion which is a close contact portion when the standing pouch 51a is expanded by the positive pressure and the periphery of the fold 55 of the folded portion 53a adheres, the air permeable securing member 31 on the contact surface portion Because the folded portions 53a are not in close contact with each other, the gas inside the standing pouch 51a can leak to the outside through the defect portion. And since the ventilation part 33 is formed in the breathable securing member 31 arrange | positioned, the gas which leaked outside from the defect part is discharged | emitted by the accommodation space 111 of the chamber 11 through the ventilation part 33. As shown in FIG. Thereby, the leak at the defect portion can be detected by the gas detection means 20.

Furthermore, even when there is a defect in the lower sheet 56a or the upper sheet 56b of the standing pouch 51a, the gas that has leaked from the defect to the outside is formed because the air-permeable portion 42 is formed in the surface air permeability ensuring means 40. Since the gas is discharged into the storage space 111 of the chamber 11 through the vent portion 42, the gas detection means 20 can detect the leak at the defect portion.
In addition, since the air-permeable securing member 31 is pressed from the outside to the folded portion 53a of the standing pouch 51a, the folded portion 53a bulges outward even if the storage space 111 of the chamber 11 is in a vacuum state. There is no deformation called buckling. As a result, the positive pressure state inside the pouch 51 can be maintained, and the amount of gas leaking from the defect portion can be sufficiently secured, so that the gas detection means 20 can reliably detect the leak at the defect portion. The accuracy of defect inspection can be improved.

  In the defect inspection method of the present embodiment, the case where the standing pouch 51a is the inspection object 50 has been described, but the inspection object 50 is not limited to the standing pouch 51a, and the gusset pouch 51b or flat bag is used. It may be a pouch 51.

[Third Embodiment of Defect Inspection Device and Defect Inspection Method]
Next, a third embodiment of the defect inspection apparatus and defect inspection method of the present invention will be described with reference to FIG.
The figure is a front view which shows the structure of the defect inspection apparatus of this embodiment.
The present embodiment differs from the first embodiment in the inspection object and in the configuration of the defect inspection apparatus based on the difference in the inspection object. That is, in the first embodiment, the inspection object is a pouch, whereas in the present embodiment, the inspection object is a cup-shaped container. In the first embodiment, the defect inspection apparatus is configured to inspect the pouch as an inspection object, whereas in the present embodiment, the defect inspection apparatus can inspect the cup-shaped container as the inspection object. It differs in that it has the following configuration. Other components are the same as in the first embodiment.
Therefore, in FIG. 26, the same components as in FIG. 1 will be assigned the same reference numerals and detailed explanations thereof will be omitted.

As shown in FIG. 26, a defect inspection apparatus 10C of the present embodiment includes a chamber 11, a gas supply means 12, a gas detection means 20, and a ventilation securing means 60 for the bottom.
Here, the chamber 11 is a hollow rectangular solid box, and is formed in a shape that can accommodate the cup-shaped paper container 70 which is the inspection object 50.
The gas supply means 12 supplies gas to the inside of the paper container 70 stored in the chamber 11.

The bottom portion air permeability ensuring means 60 is a plate-like member provided between the inner bottom surface of the chamber 11 and the bottom surface of the bottom portion 71 of the paper container 70.
The bottom portion breathability securing means 60 has a function to prevent the occurrence of buckling or the outward deformation of the bottom portion 71 of the paper container 70, and the storage space 111 where the lower surface of the bottom portion 71 of the paper container 70 is outside the paper container 70. And the function to make it contact or contact.
The former function is that the upper surface of the bottom air permeability ensuring means 60 is in contact with the lower surface of the bottom 71 of the paper container 70, and the upper surface of the bottom air permeability ensuring means 60 on the lower surface of the bottom 71 of the paper container 70. It is exerted by the fact that the contacting part is horizontal.
That is, when the gas is sealed in the inside of the paper container 70, the bottom portion 71 which is a concave portion recessed toward the inside of the paper container 70 tries to expand downward, but for the bottom Since the air permeability ensuring means 60 is disposed and the lower surface of the bottom 71 is in contact with the air permeability ensuring means 60 for the bottom, the bottom 71 can not bulge downward.
In addition, since the portion of the upper surface of the bottom portion breathability ensuring means 60 contacting the lower surface of the bottom portion 71 of the paper container 70 is horizontal, the bottom portion 71 contacting the upper surface of the bottom portion breathability ensuring means 60 is also horizontally maintained. Get down.
By these, the bottom air permeability ensuring means 60 can exhibit the function of preventing the occurrence of buckling in the bottom 71 of the paper container 70 or the deformation to the outside.

The latter function is exhibited by providing the ventilation portion 61 to the bottom air permeability ensuring means 60.
The ventilation portion 61 is a portion formed in a shape for communicating or contacting the lower surface of the bottom portion 71 of the paper container 70 with the storage space 111 located outside the paper container 70.
The shape of the ventilation portion 61 is the same as the shape of the ventilation portion 33 of the ventilation portion 30 for folding portion in the first embodiment (for example, the shape of the ventilation portion 33 shown in FIGS. 4 to 7). be able to.
When the bottom air permeability ensuring means 60 is disposed below the bottom 71 of the paper container 70, the lower surface of the bottom 71 of the paper container 70 is in contact with other members (bottom air ventilation ensuring means 60) Become.
Then, when there is a defect such as a pinhole at the bottom 71, the upper surface of the air permeability ensuring means 60 for the bottom closes the defect, and the gas sealed inside the paper container 70 passes through the defect and goes outside. And the gas detection means 20 can not detect the leak at the defect portion.
Therefore, the ventilation portion 61 is provided in the bottom portion ventilation securing means 60.
As a result, the lower surface of the bottom 71 of the paper container 70 is in fluid communication with the storage space 111 located outside the paper container 70 through the ventilation part 61, so that the gas enclosed in the paper container 70 is defective. The gas can be leaked to the outside through the vent, and the gas is discharged into the storage space 111 of the chamber 11 through the vent portion 61, so that the gas detection means 20 can detect the leak at the defective portion.

  The defect inspection method of the present embodiment, that is, the method of inspecting the presence or absence of a defect in the inspection object 50 using the defect inspection apparatus 10C is the same as the defect inspection method of the first embodiment, Description of is omitted.

As described above, according to the defect inspection apparatus and the defect inspection method of the present embodiment, even when the inspection object 50 is the paper container 70, it is possible to inspect the presence or absence of the defective portion in the paper container 70.
Even when there is a defect in the bottom 71 of the paper container 70, the gas leaked from the defect to the outside passes through the gas vent 61 because the gas vent 61 is formed in the bottom air permeability ensuring means 60. Since the gas is discharged into the storage space 111 of the chamber 11, the leak at the defect portion can be detected by the gas detection means 20.

  Furthermore, since the bottom air permeability ensuring means 60 is pressed against the bottom 71 of the paper container 70 from below, the bottom 71 does not expand outward even if gas is supplied to the inside of the paper container 70. , Deformation called buckling does not occur. As a result, the positive pressure inside the paper container 70 can be maintained, and the amount of gas leaking from the defective portion can be sufficiently ensured, so that the gas detection means 20 can reliably detect the leakage at the defective portion. The accuracy of defect inspection can be improved.

As mentioned above, although the preferable embodiment was shown and demonstrated about the defect inspection apparatus of this invention, the defect inspection apparatus which concerns on this invention is not limited only to embodiment mentioned above, A various change in the range of this invention It goes without saying that implementation is possible.
For example, the inspection object to be inspected by the defect inspection apparatus of the present invention can correspond to various shapes. The shape is not particularly limited, and examples thereof include a film, a cup, a cup, a cylinder, and a bag. Moreover, as a material which comprises a to-be-tested object, there exist plastic, paper, a metal etc., for example. Furthermore, the application includes a tank, a film, a lid, a container and the like, and in particular, it is suitable to use for an empty container.

Further, instead of the gas supply means, means for dropping liquefied nitrogen into the object to be inspected and closing means for closing the upper opening of the object to be inspected can be provided. As a result, liquefied nitrogen is vaporized inside the sealed inspection object, and the inside of the inspection object can be made to have a positive pressure.
Furthermore, in each embodiment mentioned above, although the defect inspection apparatus which detects the leak of the gas from the defect part of a to-be-inspected object was demonstrated, this invention is limited to the application to the defect inspection apparatus which performs such detection. For example, the present invention can be applied to an inspection apparatus disclosed in Patent Documents 1 and 2, that is, an inspection apparatus that measures the internal pressure of an object to be inspected and detects a decrease in the internal pressure.

10A, 10B, 10C Defect inspection device 12 Gas supply means (positive pressure means)
20 Gas detection means (detection means)
30 Permeability securing means 31 for the folded portion Permeability securing member 33 Ventilation section 331 Groove section (concave portion)
332 Pore 40 Surface air permeability securing means 42 Ventilation part 43 Groove part (concave part)
46 concave portion 47 pore 50 test object 51 (51a to 51c) pouch (bag-like container)
53a, 53b Perforated portion 60 Bottom surface ventilation means 61 ventilation portion 70 paper container 71 bottom portion

Claims (2)

A defect inspection apparatus comprising: gas supply means for supplying a gas to the inside of an inspection object; and means for detecting the presence or absence of a defect in the inspection object,
When a portion of the surface of the inspection object in contact with another member or a portion of the inspection object in contact with each other is a contact surface portion,
A venting device for communicating or contacting the contact surface portion with the space outside the object to be inspected ;
Said vent ensuring means, the surface in contact with said contact surface portion, have a rough surface of the arithmetic average roughness Ra = 1.4μm~10μm,
The contact surface portion is a recess of the inspection object,
The air permeability ensuring means is disposed to be pressed against the recess at a position contacting the recess,
The inspection object is a cup-shaped container,
The defect inspection device according to claim 1, wherein the recess is a bottom portion recessed toward the inside of the cup-shaped container . A defect inspection method comprising: a positive pressure step of supplying a gas to the inside of an inspection object; and a detection step of detecting the presence or absence of a defect in the inspection object,
When a portion of the surface of the inspection object in contact with another member or a portion of the inspection object in contact with each other is a contact surface portion,
It has a contacting step in which the contact surface portion is brought into contact with the contact surface portion, with a ventilation securing means for bringing the contact surface portion into communication or contact with the space outside the inspection object .
Said vent ensuring means, the surface in contact with said contact surface portion, have a rough surface of the arithmetic average roughness Ra = 1.4μm~10μm,
The contact surface portion is a recess of the inspection object,
The air permeability ensuring means is disposed to be pressed against the recess at a position contacting the recess,
The inspection object is a cup-shaped container,
The defect inspection method , wherein the concave portion is a bottom portion recessed toward the inside of the cup-shaped container .

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