JP5991710B2 - Method for producing bubble cushioning material - Google Patents

Description

The present invention relates to a method for manufacturing a bubble cushioning material , and in particular, in a field where a bubble cushioning material is used, air is supplied to a widthwise air chamber formed in advance on a material sheet so as to divide the widthwise air chamber. The present invention relates to a method of manufacturing a bubble cushioning material that seals and forms a plurality of closed cells.

  2. Description of the Related Art Conventionally, a cushioning material (or also called a filling material) having a pillow-like air chamber has been used when packing precision machines or waste products. In such a buffer material, the vertical dimension of the air chamber is usually several cm to several tens of cm, the horizontal dimension is several cm, and the thickness is 2 cm to 4 cm. For example, compared with a commercially available bubble sheet, it has a large air chamber, so that it can be used effectively (or with a small amount of use) for a relatively wide gap.

  The above-mentioned commercially available bubble sheet is usually a resin sheet manufactured by a manufacturer, and has many caps (the diameter of the cap is usually several mm) that bulges into a hollow shape. The cap film is formed and a back film laminated on the cap opening side of the cap film.

  Although the above cushioning material is effectively used for a relatively wide gap, it has a large air chamber, and the above-mentioned commercially available bubble sheet has many small air chambers for transportation. It had the disadvantage of reduced efficiency. In order to solve such disadvantages, various techniques have been proposed in which air is enclosed in an air chamber (also referred to as a field expansion type) when the user uses it.

  For example, in Patent Document 1, air is blown through an air chamber extending in the longitudinal direction of a film material, and an air chamber extending in the width direction is connected to the air chamber and then the opening of the air chamber is closed. The technology of the air cushioning material manufacturing apparatus which heat-processes along the longitudinal direction of a film material with a heating member, and manufactures an independent air chamber connection gas bag continuously is disclosed.

  Further, Patent Document 2 discloses that air is ejected from a nozzle inserted into an air chamber extending in the longitudinal direction of the film material, and an air chamber extending in the width direction is connected to the air chamber. Heating is performed along the longitudinal direction of the film material with a heating member disposed downstream of the outlet, and the air chamber is also slit longitudinally with a cutting member disposed downstream of the nozzle air outlet, and then inflated. The technology of the air shock absorbing material manufacturing apparatus which manufactures continuously the independent air chamber connection gas bag of a state is disclosed.

  Patent Document 3 also discloses an apparatus for manufacturing an expanded article from a film web having two juxtaposed film layers, the first rotation for creating a transverse seal that bonds the film layers together. A sealing device, an expansion assembly for directing gas between the film layers, and a second rotary sealing device for creating a longitudinal seal between the film layers that intersects the transverse seal, , A device that is encapsulated between a longitudinal seal, a transverse seal, and a film layer, thereby forming an inflated article.

  Further, in Patent Document 4, a plurality of air chambers that are formed of two sheets and can accommodate air are arranged at predetermined intervals, and air is supplied to one end surface of each air chamber. A technique of a bubble sheet precursor in which an air inlet to be introduced is disposed is disclosed.

  Further, in relation to the present invention, Patent Document 5 discloses that the thickness dimension B of the back sheet BS is 0.15 times the thickness dimension of the portion CSx of the cap sheet CS to be fused with the back sheet BS, that is, the original thickness. There is disclosed a technique of a bubble sheet characterized by being set to 0.3 times.

Japanese Patent No. 4504462 Japanese Patent No. 4199823 Special table 2008-537706 gazette JP 2004-306407 A JP 2008-979 A

However, the air cushioning material manufactured by the techniques of Patent Documents 1 and 2 described above has one or several large air chambers. Although it is used with a small amount of use), it is not suitable for a method of use such as wrapping the packaged body along the shape of the packaged body like a commercially available bubble sheet having many closed cells.
Moreover, although the expansion | swelling article manufactured by the technique of patent document 3 has the independent container (bubble) arrange | positioned by the longitudinal direction seal | sticker and the horizontal direction seal | sticker at the grid | lattice form, it has many independent bubbles. Like a commercially available bubble sheet, it was not suitable for the usage method of wrapping the package body along the shape of the package body.

  Furthermore, the air bubble sheet manufactured by the technique of Patent Document 4 has independent air chambers and cells arranged in a lattice shape, and is packaged like a commercially available air bubble sheet having many independent air bubbles. Although it is possible to wrap the package body along the shape of the body, it is required to distribute an appropriate amount of air to each air chamber to improve shock absorption, improve quality, productivity, etc. It was.

  Further, although the technology of Patent Document 5 can provide a bubble sheet having good strength while saving raw materials, in order to effectively use limited petroleum resources, further establishment of technology for saving raw materials. Is desired.

The present invention has been proposed in view of the circumstances as described above, and can wrap the packaged body along the shape of the packaged body, and can also absorb impact, quality, productivity, and resources. An object of the present invention is to provide a method for producing a bubble cushioning material that can improve the process .

In order to achieve the above object, in the method for producing a bubble cushioning material of the present invention, the widthwise air chambers extending in the widthwise direction are arranged in the longitudinal direction, and the widthwise air is introduced from at least one end side in the widthwise direction. A plurality of closed cells that are sealed so as to divide the widthwise air chamber while supplying air to the widthwise air chamber of the material sheet while conveying a material sheet having an air supply port for supplying air to the chamber. And a sealing step of sealing the widthwise air chamber after supplying air to the widthwise air chamber , and upper and lower sides of the sealed widthwise air chamber The stretching means disposed opposite to each other by a predetermined distance is divided into the stretching process for making the width direction air chambers the same thickness as a whole and the width direction air chambers having the same thickness as a whole. Sealed to form the plurality of closed cells There a method and a foam forming process.

Also, bubble wrap produced by the present invention, the virtual plane area of the closed cells is preferably at 900 mm ² or less.

According to the method for producing a bubble cushioning material of the present invention and the foam cushioning material produced thereby , the packaged body is arranged along the shape of the packaged body like a commercially available bubble sheet having a large number of closed cells. It can be wrapped, and impact absorption, quality, productivity, and resource saving can be improved.

FIG. 1: has shown the schematic plan view of the raw material sheet used for the manufacturing method of the foam cushioning material concerning 1st embodiment of this invention. FIG. 2: has shown the schematic plan view of the principal part for demonstrating the foam cushioning material manufacturing apparatus used for the manufacturing method of the foam cushioning material concerning 1st embodiment of this invention. FIG. 3 is a cross-sectional view taken along the line AA in FIG. FIG. 4 shows a cross-sectional view taken along the line BB of FIG. FIG. 5: has shown the schematic flowchart figure for demonstrating the manufacturing method of the foam cushioning material concerning 1st embodiment of this invention. FIG. 6: has shown the schematic plan view of the raw material sheet | seat and bubble cushioning material for demonstrating the manufacturing method of the foam cushioning material concerning 1st embodiment of this invention. FIG. 7 shows a schematic enlarged cross-sectional view of the main part for explaining the welding operation in the method for producing the bubble cushioning material according to the first embodiment of the present invention. FIG. 8: is a schematic enlarged view for demonstrating the effect of the foam cushioning material concerning 1st embodiment of this invention, (a) has shown sectional drawing of an example of a commercially available foam sheet, (b) These show sectional drawing of the principal part of the bubble buffer material concerning 1st embodiment. FIG. 9: has shown the schematic flowchart figure for demonstrating the manufacturing method of the foam cushioning material concerning 2nd embodiment of this invention. FIG. 10: has shown the schematic plan view of the raw material sheet and bubble cushioning material for demonstrating the manufacturing method of the foam cushioning material concerning 2nd embodiment of this invention. FIG. 11: has shown the schematic plan view of the raw material sheet used for the manufacturing method of the foam cushioning material concerning the 1st-2nd application example of this invention. FIG. 12: has shown the schematic plan view of the foam cushion for demonstrating the manufacturing method of the foam cushion concerning the 3rd-4th application example of this invention. FIG. 13: has shown the schematic plan view of the foam cushion for demonstrating the manufacturing method of the foam cushion concerning the 5th-6th application example of this invention. FIG. 14: has shown schematic expanded sectional drawing of the raw material sheet | seat and bubble cushioning material for demonstrating the manufacturing method of the foam cushioning material concerning the 7th application example of this invention.

[Method for producing bubble cushioning material and first embodiment of bubble cushioning material]
In the method for producing the bubble cushioning material of the present embodiment, the widthwise air chambers extending in the width direction are arranged side by side in the longitudinal direction, and air is supplied from at least one end side in the width direction to the widthwise air chamber. This is a method of forming a plurality of closed cells by supplying air to the widthwise air chamber of the material sheet while conveying the material sheet having the air opening, and sealing it so as to divide the widthwise air chamber. Moreover, the bubble cushioning material of this embodiment is the above-mentioned field expansion type, and is manufactured from a raw material sheet.
First, the material sheet used in the present embodiment will be described with reference to the drawings.

(Material sheet)
FIG. 1: has shown the schematic plan view of the raw material sheet used for the manufacturing method of the foam cushioning material concerning 1st embodiment of this invention.
In FIG. 1, the material sheet 10 is made of resin, and in the present embodiment, the material sheet 10 is made of nylon having a four-layer structure, but is not limited thereto. For example, it may have a three-layer structure of a low-density polyethylene layer + a high-density polyethylene layer + a low-density polyethylene layer. In this way, barrier properties can be improved and a single material can be used. Can be recycled.
Moreover, the raw material sheet | seat 10 makes the cylindrical sheet flat and is formed in the strip | belt shape, Therefore, the both ends of the width direction are connected, and the sheets have overlapped between both ends. Further, a pair of guided portions 14 extending in the longitudinal direction are provided at both end portions in the width direction of the material sheet 10, and the guided portions 14 are used in the bubble cushioning material manufacturing apparatus 101 described later.

Here, preferably, the material sheet 10 is a resin sheet having a multilayer structure of two or more layers, and the innermost layer (that is, when forming a sealing portion 15 for sealing or a sealing portion 16 for division described later, contact is made. A resin having a melting temperature or a softening temperature lower than that of the other layers (outer layers) may be used for the layers that meet each other.
In this way, when the dividing seal portion 16 is formed, the innermost layers melt before the other layers, so that they can be welded in a short time (almost instant), and the heating portion such as a heater is connected to the innermost layer. By setting only the temperature at which welding is possible, damage to the other layers of the material sheet 10 can be prevented. Thereby, the quality, productivity, etc. of the bubble cushioning material 1 can be improved.

This material sheet 10 has width direction air chambers 12 extending in the width direction arranged in parallel in the longitudinal direction by welded portions 111 and 112 to which the stacked sheets are welded, and has a width from the left end side in the width direction. An air supply port 13 for supplying air to the directional air chamber 12 is provided. The air supply port 13 is a left guided portion 14, and is formed by a pair of portions of the welded portion 111 in a portion that becomes the sealing portion 15 for sealing. Further, since the air chamber 12 in the width direction has a substantially elongated rectangular shape, the flow path resistance is small, and when the air is supplied while the material sheet 10 is being conveyed by the bubble cushioning material manufacturing apparatus 101 described later, Air can be supplied in a short time.
In addition, the width dimension of the welded portions 111 and 112 is not particularly limited, but is usually 0.00. It is several mm to several mm.

(Bubble cushioning material manufacturing equipment)
The method for producing the bubble cushioning material of the present embodiment can be carried out preferably using the bubble cushioning material producing apparatus 101.
Therefore, next, the bubble cushioning material manufacturing apparatus 101 will be described with reference to the drawings.
The bubble cushioning material manufacturing apparatus 101 is an example, and the bubble cushioning material manufacturing apparatus used in the method of manufacturing the bubble cushioning material is not limited to this.

FIG. 2: has shown the schematic plan view of the principal part for demonstrating the foam cushioning material manufacturing apparatus used for the manufacturing method of the foam cushioning material concerning 1st embodiment of this invention.
FIG. 3 is a cross-sectional view taken along the line AA in FIG.
FIG. 4 is a cross-sectional view taken along the line BB in FIG.
2 to 4, the bubble cushioning material manufacturing apparatus 101 includes a housing 2, unwinding means (not shown), guide means 4, cutter 5, air supply means 6, sealing welding means 7, and first welding. Means 83, first extension means 84, second welding means 85, second extension means 86, split welding means 8, and control means (not shown) are included.
The bubble cushioning material manufacturing apparatus 101 supplies air to the widthwise air chamber 12 from the left side in the width direction of the material sheet 10 while conveying the material sheet 10 described above, and seals the sealing portion 15 and the division seal. The part 16 is formed and the bubble cushioning material 1 is manufactured (see FIGS. 5 and 6).

(Casing)
The housing 2 is substantially box-shaped, and is mounted with a substrate 21, a blower 64, control means, and the like.

(Unwinding means)
The unwinding means (not shown) includes an unwinding shaft, a threaded image, a rotation support member, a support roller, and the like, and is configured to unwind the roll-shaped material sheet 10.
The roll-shaped material sheet 10 is usually wound around a cylindrical core.
Moreover, although the raw material sheet 10 is normally supplied to a user with a roll form, it is not limited to this, For example, you may supply a user with the folded form.

(Guide means)
The pair of guide means 4 includes a guide bar 41 and a guide roller 42, respectively, and is provided above the substrate 21 and facing the upstream side in the conveying direction of the material sheet 10. The pair of guide means 4 guides the guided portion 14 by inserting guide bars 41 into both ends of the raw material sheet 10 in the width direction, that is, the pair of guided portions 14 extending in the longitudinal direction.
A pair of guide means 4, a pair of cutters 5, a pair of air supply means 6, a pair of sealing welding means 7, a first welding means 83, a first extension means 84, and a second welding means 85. The second extending means 86 and the dividing welding means 8 are provided in order from the upstream side to the downstream side in the conveying direction of the material sheet 10.
Further, the bubble cushioning material manufacturing apparatus 101 has a pair of air supply means so as to be able to cope with a first application example and a second application example described later, that is, so that air can be supplied from both sides in the width direction of the material sheet 10. 6 and a pair of sealing welding means 7 are provided, but in the present embodiment, the air supply means 6 and the sealing welding means 7 may be provided only on the left side.

(Cutter)
The pair of cutters 5 are knife-like blades, provided approximately between the guide roller 42 and the air supply unit 6, and function as a pair of cutting units that cut both ends in the width direction of the material sheet 10.

(Air supply means)
Each of the pair of air supply means 6 includes a nozzle 61, a first pressing roller 62 as a first pressing means, a second pressing roller 63 as a second pressing means, a blower 64, and the like. It is provided facing the downstream side. The nozzle 61 is positioned between the lower sheet and the upper sheet of the cut material sheet 10, and supplies air to the width direction air chamber 12 through the air supply port 13.

(Sealing welding means)
The pair of sealing welding means 7 includes a first belt 74 and a second belt 79 that convey the material sheet 10 supplied with air to the width direction air chamber 12, and a first belt 74 and a second belt 74. The first heating unit 71 and the second heating unit 76 that heat the material sheet 10 via the belt 79 are provided, and are provided facing the downstream side of the air supply unit 6. This sealing welding means 7 forms a sealing portion 15 for sealing.

The first belt 74 is driven by torque from the motor, and the second belt 79 is driven by the first belt 74.
The second belt 79 is hung on a conveying roller 77 positioned above the driving roller 72 and a conveying roller 78 positioned above the driven roller 73. The conveying roller 77 and the conveying roller 78 are arranged on the upper frame. 23 is pivotally supported.
The upper frame 23 is rotatably connected to the lower frame 22 via a connecting member 24 attached to the downstream side of the lower frame 22 and a rotating shaft 25 protruding from the connecting member 24. Thereby, when setting the material sheet 10, the upper frame 23 can be rotated upward, and the material sheet 10 can be set easily.

The first heating means 71 has a belt-like heater extending along the longitudinal direction of the material sheet 10 and a temperature sensor for measuring the temperature around the heater, and is fixed to the lower frame 22.
Further, the second heating unit 76 has substantially the same configuration as the first heating unit 71.
In the bubble cushioning material manufacturing apparatus 101, the first belt 74 and the second belt 79 are configured to convey the material sheet 10, but are not limited thereto. For example, although not shown, another conveying means is further provided on the downstream side of the first belt 74 and the second belt 79, and the dividing sheet welding means 8 is provided on the material sheet 10 conveyed by the other conveying means. However, the split seal 16 may be formed. The first belt 74 and the second belt 79 normally convey the material sheet 10 continuously, but the other conveying means includes a dancer roll and the like, and intermittently conveys the material sheet 10. Alternatively, the dividing seal portion 16 may be formed on the material sheet 10 that is continuously conveyed by using, for example, a rotating roller heating unit described later as the dividing welding unit 8.

(First welding means)
The first welding means 83 has a heating means, a cradle and the like in substantially the same manner as the dividing welding means 8 described later, and an elevating means such as an air cylinder (on the downstream side of the sealing welding means 7). (Not shown) can be moved up and down. This first welding means 83 is formed with a sealing portion 15 for sealing, and a partial sealing portion 161 is formed on the material sheet 10 conveyed by the first belt 74 and the second belt 79 as will be described later. To do.

(First stretching means)
The first extending means 84 has an upper plate, a lower plate, and the like, substantially the same as the second extending means 86 described later, and is provided on the downstream side of the first welding means 83. In the first extension means 84, the upper plate and the lower plate are separated by a predetermined distance, and the width direction air chamber 12 is sealed between the upper plate and the lower plate so that the partial seal portion 161 is closed. The formed material sheet 10 is conveyed.
At this time, the unevenly expanded portion of the width direction air chamber 12 is in contact with the upper plate and the lower plate, and the air of the unevenly expanded portion moves to the unevenly recessed portion. The first extending means 84 is leveled so as to have substantially the same thickness.
Moreover, since the partial seal part 161 is formed in the width direction air chamber 12 by the first welding means 83, the first extension means 84 is made more than the case where the partial seal part 161 is not formed. After passing, the leveled condition can be maintained.

(Second welding means)
The second welding means 85 has a heating means, a cradle, and the like in substantially the same manner as the dividing welding means 8 described later, and an elevating means such as an air cylinder is provided downstream of the first extending means 84. (Not shown) can be moved up and down. The second welding means 85 forms a partial seal portion 162 with respect to the material sheet 10 that is leveled by the first extending means 84 so that the widthwise air chambers 12 have substantially the same thickness.

(Second stretching means)
The second extending means 86 includes an upper plate 861 and a lower plate 862 and is provided on the downstream side of the second welding means 85. In this second extension means 84, the upper plate 861 and the lower plate 862 are separated from each other by a predetermined distance, and the second welding means 85 provides a partial seal between the upper plate 861 and the lower plate 862. The material sheet 10 on which the part 162 is formed is conveyed.
At this time, the unevenly swelled portion of the width direction air chamber 12 is in contact with the upper plate 861 and the lower plate 862, and the air of the partially swelled portion moves to the unevenly recessed portion. The predetermined distance between the upper plate 861 and the lower plate 862 is normally set shorter than the predetermined distance between the upper plate and the lower plate in the first extension means 84, and the width direction air chamber 12 is By the second extending means 86, it is further smoothed to have the same thickness.
Moreover, since the partial seal part 162 is formed in the width direction air chamber 12 by the second welding means 85, the second extension means 86 is provided more than the case where the partial seal part 162 is not formed. After passing, the leveled condition can be maintained.

The second extending means 86 includes an upper plate 861 and a lower plate 862, but the upper plate 861 and the lower plate 862 are fixed, provided so as to be movable up and down by an air cylinder, or the like. It is provided so that it can be moved up and down in an energized state. This is substantially the same in the first extending means 84 described above.
Further, the second extending means 86 is not limited to the above configuration. For example, although not shown, instead of the upper plate 861 and the lower plate 862, it may be configured to have a pair of opposing rotating rollers.
Also, the first extending means 84 described above may have a configuration having a pair of opposing rotating rollers in a similar manner.

(Separation welding means)
The dividing welding means 8 includes a heating means 81, a cradle 82, and the like, and can be moved up and down by a lifting means (not shown) such as an air cylinder at positions substantially corresponding to the conveying roller 77 and the driving roller 72, respectively. Is provided. The split welding means 8 forms the split seal portion 16 on the material sheet 10 that is leveled by the second extending means 86 so that the widthwise air chambers 12 have substantially the same thickness. That is, the material sheet 10 is sealed so as to divide the widthwise air chamber 12 having substantially the same thickness as a whole, and a plurality of closed cells 17 are formed, thereby forming the bubble cushioning material 1.

The heating means 81 includes a plurality of rectangular bar heaters 811 (see FIG. 7) disposed in the width direction of the material sheet 10 at a predetermined pitch, and a cover 812 made of a material having excellent heat insulation properties and covering the side surface of the heater 811. And a temperature sensor for measuring the temperature around the heater 811. The heater 811 and the cover 812 are moved up and down as described later by lifting means such as an air cylinder. Further, a groove 813 and a groove 821 are formed in the cover 812 and the cradle 82 in order to avoid interference with the closed cells 17.
Further, the dividing welding means 8 usually has a sensor (not shown) for detecting a mark attached to the material sheet 10, a swollen widthwise air chamber 12, and the like. First, positioning for forming the division seal portion 16 is performed on the material sheet 10 to be conveyed.

The dividing welding means 8 is not limited to the above configuration. For example, although not shown, instead of the heating means 81, a rotary roller type heating means having a groove corresponding to each closed cell 17 on the outer peripheral surface and having a heater corresponding to each dividing seal portion 16 is provided. It is good also as a structure which has a rotating roller type receiving part in which the groove | channel corresponding to each independent bubble 17 was formed in the outer peripheral surface instead of the receiving stand 82. If it does in this way, the sealing part 16 for division | segmentation can be formed with respect to the raw material sheet 10 conveyed continuously.
Further, the first welding means 83 described above may be configured to include a rotary roller type heating means having a heater corresponding to each partial seal portion 161 and a rotary roller type receiving portion.
Further, the second welding means 85 described above may be configured to include a rotary roller type heating means having a heater corresponding to each partial seal portion 162 and a rotary roller type receiving portion.

(Method for producing bubble cushioning material)
Next, the operation of the bubble cushioning material manufacturing apparatus 101 having the above configuration, the method of manufacturing the bubble cushioning material according to the present embodiment, and the like will be described with reference to the drawings.
FIG. 5: has shown the schematic flowchart figure for demonstrating the manufacturing method of the foam cushioning material concerning 1st embodiment of this invention.
FIG. 6 is a schematic plan view of the material sheet and the bubble cushioning material for explaining the method for producing the bubble cushioning material according to the first embodiment of the present invention.
5 and 6, the method for manufacturing the bubble cushioning material 1 according to this embodiment uses the above-described bubble cushioning material manufacturing apparatus 101 to transport the material sheet 10 to the air chamber 12 in the width direction of the material sheet 10. In this method, air is supplied and sealed so as to divide the widthwise air chamber 12 to form a plurality of closed cells 17.

First, the bubble cushioning material manufacturing apparatus 101 is in a stopped state, and a roll-shaped material sheet 10 is attached to unwinding means (not shown) by the user.
Next, the end of the conveyance direction is unwound by the user in the conveyance direction side, and the raw material sheet 10 is hung on the pair of rollers 20. Subsequently, each guided portion 14 is inserted into the guide bar 41, and the material sheet 10 is moved in the transport direction by the user.
Subsequently, the material sheet 10 includes a guide roller 42, a cutter 5, an air supply unit 6, a sealing welding unit 7, a first welding unit 83, a first extension unit 84, a second welding unit 85, It is pulled by the user until it passes through the second extending means 86 and the split welding means 8. Here, the cutter 5 cuts the guided portion 14, and the cut guided portion 14 is smoothly held between the first pressing roller 62 and the second pressing roller 63. Further, the sealing welding means 7 is in a state where the upper frame 23 is rotated upward and opened,
The first welding means 83, the second welding means 85, and the dividing welding means 8 are in a state where the heating means and the cradle are open, and the first stretching means 84 and the second stretching means 86 are Since the upper plate and the lower plate are in an open state, the material sheet 10 is easily pulled along the first belt 74.
Then, the user turns the upper frame 23 downward and closes it. Thereby, the raw material sheet 10 is set in the bubble cushioning material manufacturing apparatus 101.

Next, the user turns on an operation switch (not shown) of the bubble cushioning material manufacturing apparatus 101.
In addition, the bubble cushioning material manufacturing apparatus 101 preliminarily includes the rotation speed of the motor, the heaters of the first heating unit 71 and the second heating unit 76, the first welding unit 83, the second welding unit 85, and the dividing unit. The heating temperature of the heater of the welding means 8 is set. Normally, when an operation switch (not shown) is turned on, the temperature control device controls the heaters to be heated. 64 and the motor are actuated to enter the operating state.

In FIG. 5, in the method of manufacturing the bubble cushioning material of the present embodiment, first, the material sheet 10 is transported in a state where both end portions in the width direction are guided (step S1).
That is, the bubble cushioning material manufacturing apparatus 101 in the operating state conveys the material sheet 10 in a state where the first belt 74 and the second belt 79 sandwich the end portion in the width direction of the material sheet 10. The means 4 conveys the material sheet 10 in a state in which both end portions (guided portions 14) in the width direction are guided.
This state is a state in n (n is a natural number) row in FIG.

Next, both ends in the width direction of the material sheet 10 are cut (step S2).
That is, the cutter 5 cuts the guided portion 14 that is stretched in the longitudinal direction by the guide roller 42.
This state is the state in the (n + 1) th row in FIG.

Next, air is supplied from the left side in the width direction of the material sheet 10 to the width direction air chamber 12 (step S3).
That is, the air supply means 6 presses the material sheet 10 from which the first pressure roller 62 and the second pressure roller 63 are cut against the nozzle 61, and in a state where the material sheet 10 is movably held, the discharge port of the nozzle 61 From the left side of the width direction of the raw material sheet 10, air is supplied to the width direction air chamber 12.
This state is the state in the (n + 2) th row in FIG.

Here, preferably, the air pressure discharged from the nozzle 61 is controlled so that a predetermined amount of air is supplied to the widthwise air chamber 12. If it does in this way, sufficient air quantity for each closed cell 17 to function as a buffering material can be supplied to the width direction air chamber 12.
Note that the predetermined amount of air refers to the amount of air in which the filling rate is normally 65% to 97% in the closed cells 17.
Further, the above air pressure control may be performed manually or automatically.

Next, as a sealing step, the widthwise air chamber 12 supplied with air is sealed by forming the sealing portion 15 for sealing (step S4).
That is, the sealing welding means 7 conveys the first belt 74 and the second belt 79 with the material sheet 10 supplied with air sandwiched between the width direction air chambers 12, and the first heating means 71 and the second belt 79. The two heating means 76 heats the material sheet 10 via the first belt 74 and the second belt 79 to form the sealing portion 15 for sealing extending in the longitudinal direction, whereby the air supply port 13 is sealed.
This state is the state in the (n + 3) th row in FIG.

  Here, it is preferable to control the formation position in the width direction of the sealing portion 15 for sealing so that a predetermined amount of air is supplied to the width direction air chamber 12. That is, as described above, instead of controlling the air pressure discharged from the nozzle 61, or by controlling the formation position in the width direction of the sealing portion 15 together with the air pressure, the individual bubbles 17 are An amount of air sufficient to function as a buffer material can be supplied to the widthwise air chamber 12.

Next, as the first partial sealing step, the first welding means 83 forms the partial seal portion 161 to partially seal the widthwise air chamber 12 so as to correspond to the plurality of closed cells 17. (Step S5). That is, the first partial sealing step (step S5) is provided between the sealing step (step S4) and the first extending step (step S6) described later.
The partial seal portion 161 of the present embodiment is formed at two opposing locations, one having a shape protruding upstream from the downstream welded portion 111 and the other being the upstream weld. The shape protrudes downstream from the portion 111. Moreover, it is not sealed between the partial seal parts 161 which oppose, and the air in the width direction air chamber 12 can move to the width direction.
This state is the state in the (n + 4) th row in FIG.

Next, as a first extending step, the first extending means 84 sets the widthwise air chamber 12 that is sealed and formed with the partial seal portion 161 to have substantially the same thickness as a whole (step S6).
That is, when the width direction air chamber 12 passes through the extending means 84, the unevenly expanded portion of the width direction air chamber 12 is in contact with the upper plate and the lower plate of the extending means 84, and the unevenly expanded portion. Since the air moves to the unevenly depressed portion, the width direction air chamber 12 is leveled by the first extending means 84 so as to have almost the same thickness, and is almost the same in the region where each closed cell 17 is formed. The amount of air can be distributed.
Moreover, since the partial seal part 161 is formed in the width direction air chamber 12 by the first welding means 83, the first extension means 84 is made more than the case where the partial seal part 161 is not formed. After passing, the leveled condition can be maintained.
This state is the state in the (n + 5) th row in FIG.

Next, as the second partial sealing step, the second welding means 85 forms the partial seal portion 162 so that the widthwise air chamber 12 is partially sealed so as to correspond to the plurality of closed cells 17. (Step S7).
The partial seal portion 162 of this embodiment is formed between the partial seal portions 161 facing each other, and is not sealed between the partial seal portion 161 and the partial seal portion 162. The air in the directional air chamber 12 can move in the width direction.
This state is the state in the (n + 6) th row in FIG.

Next, as a second extending step, the second extending means 86 sets the width direction air chamber 12 that is sealed and formed with the partial seal portion 162 to have substantially the same thickness as a whole (step S8).
That is, when the width direction air chamber 12 passes through the extending means 86, the portion of the width direction air chamber 12 which is bulged out in contact with the upper plate 861 and the lower plate 862 of the extending means 86, and is bulged out of shape. Since the air in the part moves to the part that is unevenly depressed, the width direction air chamber 12 is further smoothed by the second extending means 86 so as to have the same thickness, and in the region that becomes each closed cell 17, Furthermore, the same amount of air can be distributed.
Moreover, since the partial seal part 162 is formed in the width direction air chamber 12 by the second welding means 85, the second extension means 86 is provided more than the case where the partial seal part 162 is not formed. After passing, the leveled condition can be maintained.
This state is the state in the (n + 7) th row in FIG.

Here, in this embodiment, as described above, after the first partial sealing step (step S5) and the first extension step (step S6), the second partial sealing step (step S7) and the second extension step. The process (step S8) is a method that is further repeated. As a result, as described above, the width direction air chamber 12 is sealed stepwise or gradually, and the air volume is leveled each time, so that the closed cells 17 having a substantially uniform size can be formed. Can be improved.
In the present embodiment, the partial sealing step and the stretching step are repeated twice. However, the number of times of turning back is not limited to twice, and may be repeated once or three times or more, for example. .

Next, as the closed cell forming step, the split welding means 8 forms the split seal portion 16 to seal the width direction air chamber 12 having the same overall thickness so as to be divided into a plurality of pieces. Closed bubbles 17 are formed (step S9).
That is, the dividing welding means 8 corresponds to the material sheet 10 to be conveyed, the heating means 81 is lowered and the cradle 82 is raised, and the heating means 81 heats the material sheet 10 in the longitudinal direction. By forming the dividing seal portion 16 that extends, air is sealed in each closed cell 17 to form a plurality of closed cells 17.
In this way, it is possible to distribute the air amount sufficient to function as a cushioning material to each closed cell 17 and substantially the same amount of air, thereby improving the shock absorbing property of the foam cushioning material 1. Can be made.
In addition, since formation of the division | segmentation seal | sticker part 16 is performed in a short time (for example, almost instantaneously), although it depends on a conveyance speed, normally, with respect to the raw material sheet 10 conveyed, a division | segmentation seal | sticker is satisfactory. The portion 16 can be formed.
This state is the state in the (n + 8) th row in FIG.

Here, preferably, when the dividing seal portion 16 is formed, the protective member (the cover 812 in the present embodiment) that covers the heating portion (the heater 811 in the present embodiment) of the heating means 81 is the material sheet 10. After the heater 811 is sealed, the cover 812 may release the holding of the material sheet 10 after the heater 811 is separated from the material sheet 10.
Specifically, as shown in FIG. 7A, when the material sheet 10 is conveyed to a position where the dividing seal portion 16 is formed, the heating means 81 is raised and the cradle 82 is lowered. In addition, the lower end of the heater 811 is located above the lower end of the cover 812. If it does in this way, the malfunction that the heater 811 touches the sheet | seat of the width direction air chamber 12 and makes a hole in a sheet | seat can be prevented reliably.
In FIG. 7A, the material sheet 10 has a partial seal portion 161 and a partial seal portion 162, which are omitted.

Next, as shown in FIG. 7B, when the raw material sheet 10 reaches a position where the dividing seal portion 16 is formed, the heating means 81 is lowered and the cradle 82 is lifted, and the cover 812 and the cradle. The material sheet 10 is held by 82. At this time, the lower end of the heater 811 is positioned above the lower end of the cover 812.
Subsequently, as shown in FIG. 7C, the heater 811 is lowered while the material sheet 10 is held, and the material sheet 10 is melted and sealed.

Next, as shown in FIG. 7 (d), when the heater 811 is raised and the heater 811 is separated from the material sheet 10, the melted portion is solidified and the dividing seal portion 16 is formed. At this time, since the material sheet 10 is held by the cover 812 and the cradle 82, the division seal portion 16 is well formed, and the material sheet 10 becomes the bubble cushioning material 1.
Subsequently, as shown in FIG. 7E, the heating means 81 (that is, the heater 811 and the cover 812) is raised, the cradle 82 is lowered, the holding of the bubble cushioning material 1 is released, and the bubble cushioning material is manufactured. The apparatus 101 carries out the bubble cushioning material 1 in which a plurality of closed cells 17 are formed.
If it does in this way, while preventing the damage to the raw material sheet 10, the division | segmentation seal | sticker part 16 excellent in airtightness can be formed, and the quality of the foam cushioning material 1 etc. can be improved.

(Bubble cushioning material)
The bubble cushioning material 1 according to the present embodiment is manufactured by the above-described manufacturing method. The widthwise air chambers 12 extending in the width direction are arranged in parallel in the longitudinal direction, and at least one end side in the width direction (the book) In the embodiment, the bubble cushioning material is manufactured from the material sheet 10 having the air supply port 13 for supplying air from the left end portion side) to the widthwise air chamber 12.
In addition, after supplying air to the width direction air chamber 12, the bubble cushioning material 1 seals the width direction air chamber 12, and seals the sealed width direction air chamber 12 so as to divide it. Closed bubbles 17 are formed, and the virtual plane area of the closed bubbles 17 is 900 mm ² or less. The virtual plane area means an area when the air is extracted from the closed cells 17 and is flattened.

The closed cells 17 of the present embodiment have a substantially square shape, and m (m is a natural number of 2 or more, and usually several tens or more of natural numbers) in n rows (n is a natural number). .) Are formed, and m are formed in the (n + 1) th row (see FIG. 6).
In addition, as shown in FIG. 6, the bubble cushioning material 1 is first provided in the width direction air chamber 12 along the width direction via the air supply port 13 on the end side in the width direction (the left end in this embodiment). The sealing seal portion 15 is formed along the longitudinal direction so as to supply air from the (part side) and then the air supply port 13 is sealed, and then the division sealing portion 16 is sealed. By sealing the width direction air chamber 12 so as to be divided, a plurality of closed cells 17 are formed.
Further, the dividing seal portion 16 for sealing so as to divide the widthwise air chamber 12 is a longitudinal seal portion formed along the longitudinal direction.

  As described above, since the air supply port 13 is sealed in the bubble cushioning material 1, air is not exposed to the outside when the plurality of split seal portions 16 are formed. Further, before the split seal portion 16 is formed, as described above, the first partial sealing step (step S5), the first extension step (step S6), the second partial sealing step (step S7), and the first step A double-stretching step (step S8) is performed. Therefore, since the bubble cushioning material 1 has an air amount sufficient to function as a cushioning material for each closed cell 17 and substantially the same amount of air is distributed, the shock absorbing property can be improved. it can.

Further, the virtual plane area of the closed cells 17 is 900 mm ² or less. Here, More preferably, it is 400 mm < ² > or less, More preferably, it is 100 mm < ² > or less.
If it does in this way, it can wrap this to-be-packaged body easily along the shape of a to-be-packaged body (not shown) using the bubble cushioning material 1, and the bubble cushioning material 1 is differentiated from a cushioning material. Thus, the added value as a product can be improved.
In addition, it is because it becomes difficult to wrap this to-be-packaged body easily along the shape of a to-be-packaged body when the virtual plane area of the closed cell 17 is larger than 900 mm < ² >.

Further, the bubble cushioning material 1 can save resources compared to a commercially available bubble sheet.
That is, as shown in FIG. 8A, since the cap sheet 202 is vacuum-formed in the commercially available bubble sheet 201, the thickness t _CS of the peripheral edge portion of the top surface of the cap sheet 202 is usually the cap. The thickness t _CSX of the portion of the sheet 202 that is fused to the back sheet 203 is about 1/3 (t _CS = t _CSX / 3). In order to make the mechanical strength of the cap sheet 202 and the back sheet 203 forming the air chamber 204 the same, the thickness t of the back sheet 203 is set to the thickness t _CS of the peripheral edge of the top surface of the cap sheet 202. (T = t _CS ). Therefore, the bubble sheet 201 has a total thickness T ′ of each sheet as T ′ = t + t _CSX = t + 3t = 4t.
On the other hand, as shown in FIG. 8 (b), the bubble cushioning material 1 forms the closed cells 17 without vacuum forming, so the total thickness T of each sheet is T = t + t = 2t, Compared with T ′ described above, the amount of resin used can be reduced to about ½, and resource saving can be achieved.

As described above, according to the method of manufacturing the bubble cushioning material 1 and the bubble cushioning material 1 of the present embodiment, along the shape of the packaged body, like a commercially available bubble sheet having a large number of closed cells, A packaged body can be wrapped, and impact absorption, quality, productivity, and resource saving can be improved.
In addition, the manufacturing method of this embodiment can also be applied to a bubble cushioning material in which the virtual plane area of the closed cells 17 is 900 mm ² , and can improve shock absorption and the like.
Moreover, the length of the width direction of the bubble buffer material 1 is not specifically limited, For example, it is good also as about 1 m.

[Method for producing bubble cushioning material and second embodiment of foam cushioning material]
FIG. 9: has shown the schematic flowchart figure for demonstrating the manufacturing method of the foam cushioning material concerning 2nd embodiment of this invention.
FIG. 10 is a schematic plan view of the material sheet and the bubble cushioning material for explaining the method for producing the bubble cushioning material according to the second embodiment of the present invention.
9 and 10, the method of manufacturing the bubble cushioning material of the present embodiment is compared with the first embodiment described above, the first partial sealing step (step S5), the first extension step (step S6), the second Instead of the partial sealing step (step S7), the second expansion step (step S8), and the closed cell formation step (step S9), it has an expansion step (step S6a) and a closed cell formation step (step S9a). Etc. are different. In addition, the other method of this embodiment is as substantially the same as 1st embodiment.
Therefore, in FIGS. 9 and 10, the same components as those in FIGS. 5 and 6 are denoted by the same reference numerals, and detailed description thereof is omitted.
Moreover, the raw material sheet 10 of this embodiment is the same as that of the first embodiment.

After the above-described sealing step (step S4), as an extension step, the extension means sets the sealed width direction air chamber 12 as a whole to substantially the same thickness (step S6a). Note that this stretching means has substantially the same configuration as the first stretching means 84 and the second stretching means 86 described above.
That is, when the width direction air chamber 12 passes through the extending means, the unevenly expanded portion of the width direction air chamber 12 comes into contact with the upper plate and the lower plate of the extending means, and the air in the unevenly expanded portion becomes air. , The air chamber 12 in the width direction is leveled so as to have substantially the same thickness by the extending means, and substantially the same amount of air is distributed to the regions where the individual bubbles 17 are formed. be able to.
This state is the state in the (n + 4) th row in FIG.

Next, as the closed cell forming step, the split welding means 8 forms the split seal portion 16 to seal the width direction air chamber 12 having the same overall thickness so as to be divided into a plurality of pieces. Closed bubbles 17 are formed (step S9a).
That is, the dividing welding means 8 corresponds to the material sheet 10 to be conveyed, the heating means 81 is lowered and the cradle 82 is raised, and the heating means 81 heats the material sheet 10 in the longitudinal direction. By forming the dividing seal portion 16 that extends, air is sealed in each closed cell 17 to form a plurality of closed cells 17.
Even in this case, it is possible to distribute the air amount sufficient to function as a buffer material to each closed cell 17 and substantially the same amount of air, and the shock absorbing property of the bubble buffer material 1 can be increased. Can be improved.
This state is the state in the (n + 5) th row in FIG.

(Bubble cushioning material)
The bubble cushioning material 1 ′ of the present embodiment is manufactured by the above-described manufacturing method, and has a configuration substantially similar to that of the first embodiment.
Note that the bubble cushioning material 1 ′ of the present embodiment has a first partial sealing step (step S 5), a first stretching step (step S 6), and a second partial sealing step ( Since the step S7) and the second stretching step (step S8) have not been performed, the variation in the amount of air distributed to each closed cell 17 is slightly increased, but since the stretching step (step S6a) has been performed, the cushioning material Can function as well.

As described above, according to the present embodiment, substantially the same effect as that of the first embodiment is obtained, and the number of steps is reduced, so that the structure of the bubble cushioning material manufacturing apparatus (not shown) is simplified. Therefore, it is possible to reduce the size and the manufacturing cost.
The first and second embodiments have various application examples.
Next, application examples of these embodiments will be described with reference to the drawings.

<Method for producing foam cushioning material and first applied example of foam cushioning material>
FIG. 11: has shown the schematic plan view of the raw material sheet used for the manufacturing method of the foam cushioning material concerning the 1st-2nd application example of this invention.
In FIG. 11 (a), the manufacturing method of the foam cushioning material and the foam cushioning material of the first application example use the material sheet 10x that supplies air from both ends in the width direction, as compared with the first embodiment described above. Differences are made. The other methods and configurations of this application example are almost the same as those of the first embodiment.

Compared to the material sheet 10 described above, the material sheet 10x used in this application example includes a width direction air chamber 12 to which air is supplied from the left end side in the nth row, and further from the right end side. A width-direction air chamber 12 to which air is supplied is formed, and the left-side width-direction air chamber 12 and the right-side width-direction air chamber 12 are separated by a welded portion 112.
In this way, in the material sheet 10x, the width direction air chamber 12 positioned on the left side is supplied with air from the left air supply port 13, and the width direction air chamber 12 positioned on the right side is supplied with the right air supply port 13. Since air is supplied from this, the production speed can be increased and the productivity can be improved.

Further, when air is supplied only from one end side and the production speed is maintained, the number of closed cells 17 that can be formed in n rows may be limited to, for example, m. Even in such a case, according to this application example, a total of 2 m closed cells 17 can be formed in n rows. Accordingly, it is possible to provide a bubble cushioning material having a larger number of closed cells 17 in the width direction or a wider width, and the added value as a product can be improved.
In addition, since the width direction air chamber 12 located on the left side and the width direction air chamber 12 located on the right side have a substantially elongated rectangular shape, the flow path resistance is small, and the bubble cushioning material manufacturing apparatus 101 described above causes the material sheet 10x to be formed. When air is supplied while being conveyed, the air can be supplied smoothly and in a short time.

As described above, the method for manufacturing the bubble cushioning material and the bubble cushioning material of the present application example have substantially the same effects as those of the first embodiment, and can also increase productivity and added value as a product (width dimension can be increased). Value added) can be improved.
In addition, although this application example and each application example mentioned later are the application examples with respect to 1st embodiment, it is good also as an application example with respect to 2nd embodiment.

<Method for producing foam cushioning material and second applied example of foam cushioning material>
In FIG.11 (b), the manufacturing method of the foam cushioning material and foam cushioning material of a 2nd application example use the raw material sheet 10y in which the welding part 112 is not formed compared with the 1st application example mentioned above. Is different. The other methods and configurations of this application example are almost the same as those of the first application example.

Compared to the material sheet 10x described above, the material sheet 10y used in this application example has a width direction air chamber 12 in which air is supplied from the left end side in the nth row. The chamber 12 is configured such that air is also supplied from the right end side, and the left width direction air chamber 12 and the right width direction air chamber 12 are not partitioned by the welded portion 112.
In this way, the material sheet 10y is supplied with air from the left air supply port 13 and the right air supply port 13 in the width direction air chamber 12, so that the production speed can be increased and the productivity can be increased. Can be improved.

  Further, when air is supplied only from one end side and the production speed is maintained, the number of closed cells 17 that can be formed in n rows may be limited to, for example, m. Even in such a case, according to this application example, a total of 2 m closed cells 17 can be formed in n rows. Accordingly, it is possible to provide a bubble cushioning material having a larger number of closed cells 17 in the width direction or a wider width, and the added value as a product can be improved.

  Thus, the manufacturing method of the bubble cushioning material and the bubble cushioning material of the present application example can achieve substantially the same effects as the first application example.

<Method for producing foam cushioning material and third application example of foam cushioning material>
FIG. 12: has shown the schematic plan view of the foam cushion for demonstrating the manufacturing method of the foam cushion concerning the 3rd-4th application example of this invention.
In FIG. 12 (a), the bubble cushioning material manufacturing method and the bubble cushioning material of the third application example are divided seal portions for sealing so as to divide the widthwise air chamber 12 as compared with the first embodiment described above. The difference is that 16a is an oblique seal portion. The other methods and configurations of this application example are almost the same as those of the first embodiment.
Therefore, in FIG. 12A, the same components as those in FIG. 6 are denoted by the same reference numerals, and detailed description thereof is omitted.

The division seal portion 16a of this application example is formed along a direction inclined by about 45 ° with respect to the longitudinal direction, and the bubble cushioning material 1a includes closed cells 17a having a substantially parallelogram shape.
In this way, when the bubble cushioning material 1a is used by being bent along the longitudinal direction, the corners of the packaged body will surely contact the closed cells 17a, that is, the corners of the packaged body are bubble cushioned. Since it is possible to avoid the problem that the closed cell 17 does not effectively act on the corner portion due to contact with the dividing seal portion 16 of the material 1, the performance as a cushioning material can be improved.

  As described above, the method for producing the bubble cushioning material and the bubble cushioning material of the present application example can achieve substantially the same effects as the first embodiment, and can improve the performance as the cushioning material.

<Fabric Buffer Material Production Method and Fourth Application Example of Bubble Buffer Material>
In FIG. 12 (b), the bubble cushioning material manufacturing method and the bubble cushioning material of the fourth application example are divided seal portions for sealing so as to divide the widthwise air chamber 12 as compared with the first embodiment described above. 16b is a meander seal part. The other methods and configurations of this application example are almost the same as those of the first embodiment.
Therefore, in FIG.12 (b), the same code | symbol is attached | subjected about the component similar to FIG. 6, and the detailed description is abbreviate | omitted.

The division seal portion 16b of this application example is formed in a meandering shape, and the bubble cushioning material 1b has closed cells 17b in a substantially meandering shape.
In this way, when the bubble cushioning material 1b is used by being bent along the longitudinal direction, the corners of the packaged body always hit the closed cells 17b, so that the performance as a cushioning material can be improved.

  As described above, the method for producing the bubble cushioning material and the bubble cushioning material of the present application example can achieve substantially the same effects as the first embodiment, and can improve the performance as the cushioning material.

<Fabric buffer material manufacturing method and bubble buffer material fifth application example>
FIG. 13: has shown the schematic plan view of the foam cushion for demonstrating the manufacturing method of the foam cushion concerning the 5th-6th application example of this invention.
In FIG. 13 (a), the bubble cushioning material manufacturing method and the bubble cushioning material of the fifth application example are divided by the sealing part for sealing so as to divide the widthwise air chamber 12 as compared with the first embodiment described above. The difference is that 16c is a zigzag seal portion. The other methods and configurations of this application example are almost the same as those of the first embodiment.
Therefore, in FIG. 13A, the same components as those in FIG. 6 are denoted by the same reference numerals, and detailed description thereof is omitted.

The dividing seal portion 16c of this application example is formed in a zigzag shape, and the bubble cushioning material 1c has substantially regular triangular closed cells 17c.
In this way, when the bubble cushioning material 1c is used by being bent along the longitudinal direction, the corners of the packaged body always hit the closed cells 17c, so that the performance as a cushioning material can be improved.

  As described above, the method for producing the bubble cushioning material and the bubble cushioning material of the present application example can achieve substantially the same effects as the first embodiment, and can improve the performance as the cushioning material.

<Manufacturing method of bubble cushioning material and sixth application example of bubble cushioning material>
In FIG. 13 (b), the bubble cushioning material manufacturing method and the bubble cushioning material of the sixth application example differ from the first embodiment described above in that a plurality of closed cells 17d have a honeycomb structure. The other methods and configurations of this application example are almost the same as those of the first embodiment.
Therefore, in FIG. 13B, the same components as those in FIG. 6 are denoted by the same reference numerals, and detailed description thereof is omitted.

The material sheet (not shown) of this application example is formed along the width direction so that the zigzag welded portions 111d and 111d 'bent at an angle of about 120 ° face each other.
Note that the width direction air chamber (not shown) formed by the welded portions 111d and 111d ′ and the welded portion 112 has a larger flow path resistance when supplying air than the widthwise air chamber 12 described above. Is an acceptable range.

The division seal portion 16d of this application example is formed along the longitudinal direction, and the bubble cushioning material 1d has closed cells 17d having a honeycomb structure. The honeycomb structure refers to a structure in which regular hexagons are arranged without gaps.
In this way, when the bubble cushioning material 1d is used by being bent along the longitudinal direction or the width direction, the corner portion of the packaged body always hits the closed cells 17d, so that the performance as a cushioning material is improved. be able to.
Further, since the plurality of closed cells 17d have a honeycomb structure, the mechanical strength of the bubble cushioning material 1d can be improved.

  As described above, the bubble cushioning material manufacturing method and the foam cushioning material of the present application example can achieve substantially the same effects as the first embodiment, and can improve the performance and mechanical strength as the cushioning material.

<The manufacturing method of a foam cushioning material, and the 7th application example of a foam cushioning material>
FIG. 14: has shown schematic expanded sectional drawing of the raw material sheet | seat and bubble cushioning material for demonstrating the manufacturing method of the foam cushioning material concerning the 7th application example of this invention.
In FIG. 14, the manufacturing method of the bubble cushioning material and the bubble cushioning material of the seventh application example include a material sheet 10e in which the widthwise air chambers 12 (see FIG. 1) are arranged in parallel as compared with the first embodiment described above. The other difference is that one sheet 18 and the other sheet 19 are provided, and one sheet 18 is slacker than the other sheet 19. The other methods and configurations of this application example are almost the same as those of the first embodiment.
Therefore, in FIG. 14, the same components as those in FIG. 6 are denoted by the same reference numerals, and detailed description thereof is omitted.

FIG. 14A is a schematic enlarged cross-sectional view of the material sheet 10e before air is supplied, that is, in the conveying process (step S1) or the cutting process (step S2). Is, for example, a folded state or a wrinkled state.
In addition, as above-mentioned with respect to the raw material sheet | seat 10e which passed through the cutting process (step S2), an air supply process (step S3), a sealing process (step S4), a 1st partial sealing process (step S5), 1st The stretching process (step S6), the second partial sealing process (step S7), and the second stretching process (step S8) are performed (see FIG. 5).

  FIG. 14B is a schematic enlarged cross-sectional view of the bubble cushioning material 1e in the closed cell forming step (step S9), and shows a substantially central portion of the closed cell 17e. In the bubble cushioning material 1e, the other sheet 19 is substantially flat, and the closed bubbles 17e are formed so as to be thicker upward and protrude upward due to a slack portion. In this way, the closed cells 17e have a shape similar to the air chamber 204 of the bubble sheet 201 shown in FIG. 8A, and can improve the buffer absorbability at the upper edge of the welded portion 111. The performance as a material can be improved.

FIG. 14C is a schematic enlarged cross-sectional view of the bubble cushioning material 1e in the closed bubble forming step (step S9), and shows the division seal portion 16. In the bubble cushioning material 1e, when the partial seal portion 161, the partial seal portion 162, and the split seal portion 16 are formed, the other sheet 19 is stretched, so that the other sheet 19 is substantially flat. be able to.
In FIG. 14C, the partial seal portion 161, the partial seal portion 162, and the division seal portion 16 are indicated by broken lines.

As described above, the bubble cushioning material manufacturing method and the foam cushioning material of the present application example have substantially the same effects as the first embodiment, and can improve the buffer absorbability at the upper edge of the welded portion 111 and the like. It is possible to improve the performance as a cushioning material.
This application example can also be applied to the above-described second embodiment and each application example.

As mentioned above, although the preferable embodiment etc. were shown and explained about the manufacturing method of the foam cushioning material of the present invention, the manufacturing method of the foam cushioning material concerning the present invention is not limited only to the above-mentioned embodiment etc., It goes without saying that various modifications can be made within the scope of the present invention.
For example, although not shown, each bubble cushioning material may be formed with a width direction perforation extending in the width direction. In this way, the user can easily cut off and improve usability. Can do.
Further, each bubble cushioning material is normally supplied with air to the air chamber, but is not limited thereto, and for example, nitrogen may be supplied.

1, 1 ', 1a, 1b, 1c, 1d, 1e Bubble cushioning material 2 Case
4 Guide means
5 Cutter
6 Air supply means 7 Sealing welding means 8 Split welding means 10, 10 e, 10 x, 10 y Material sheet
12 Width direction air chamber 13 Air supply port 14 Guided portion 15 Sealing seal portion 16 Split seal portions 17, 17 a, 17 c, 17 d, 17 e Closed air bubbles 18 One sheet 19 The other sheet 20 Roller 21 Substrate
22 Lower frame
23 Upper frame
24 connecting member
25 Rotating shaft
41 Guide bar
42 Guide roller
61 Nozzle 62 First Pressing Roller 63 Second Pressing Roller 64 Blower 71 First Heating Means
72 Drive roller
73 Followed roller
74 First belt 76 Second heating means 77, 78 Conveying roller 79 Second belt
81 Heating means 82 Receiving base 83 First welding means 84 First extending means 85 Second welding means 86 Second extending means 101 Bubble cushioning material manufacturing apparatus 111, 111d, 111d ', 112 welding portion 161, 162 Partial seal portion 201 Bubble sheet 202 Cap sheet 203 Back sheet 204 Air chamber 811 Heater 812 Cover 813 Groove 821 Groove 861 Upper plate 862 Lower plate

Claims (8)

The width direction air chambers extending in the width direction are arranged side by side in the longitudinal direction, while conveying a material sheet having an air supply port for supplying air from at least one end side in the width direction to the width direction air chamber, Supplying air to the width direction air chamber of the material sheet, sealing to divide the width direction air chamber, a method for producing a bubble cushioning material forming a plurality of closed cells,
A sealing step of sealing the width direction air chamber after supplying air to the width direction air chamber;
A stretching step in which the widthwise air chamber is entirely made the same thickness by stretching means disposed opposite to each other by a predetermined distance above and below the sealed widthwise air chamber;
A method for producing a bubble cushioning material, comprising: a closed cell forming step of sealing the widthwise air chambers having the same overall thickness so as to be divided to form the plurality of closed cells.   2. The bubble cushioning material according to claim 1, further comprising a partial sealing step of partially sealing between the sealing step and the extension step so as to correspond to the plurality of closed cells. Manufacturing method.   The method for producing a bubble cushioning material according to claim 2, wherein the partial sealing step and the stretching step are further repeated.   The air bubble according to any one of claims 1 to 3, wherein the air pressure and / or the position of the sealing part for sealing are controlled so as to supply a predetermined amount of air to the widthwise air chamber. A method of manufacturing the cushioning material. 5. The method for producing a bubble cushioning material according to claim 1, wherein a virtual plane area of the closed cells is 900 mm ² or less. 6. The dividing seal part for sealing so as to divide the widthwise air chamber is a longitudinal seal part, an oblique seal part, a meandering seal part, or a zigzag seal part . The manufacturing method of the foam cushioning material as described in any one . The method for producing a bubble cushioning material according to any one of claims 1 to 5, wherein the plurality of closed cells have a honeycomb structure. The material sheet in which the width direction air chamber is arranged has a one sheet and the other sheet, said one sheet of claim 1 to 7, characterized in that loose than the other sheet The manufacturing method of the foam cushioning material as described in any one.

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