JP2000177029A - Method and apparatus for manufacture synthetic resin bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing synthetic resin bags in which lengthy synthetic resin films are supplied, the films are welded together to make welded films in which the synthetic resin bags are molded continuously, and the welded films can be cut continuously into the individual bags without applying tension. SOLUTION: In a synthetic resin bag manufacturing apparatus in which synthetic resin films are welded together to mold synthetic resin bags B continuously, the welded films are cut into the individual bags by a cutting part D comprising a lower table 18, a cutting blade holding plate, a fitting part for the holding plate, and a mechanism part which moves the fitting part vertically, and the bags are carried out by a discharge part E comprising a belt conveyer 33, belt-shaped metal cutting blades 23 are arranged in a cutting shape on the cutting blade holding plate, non-cutting parts are formed in the cutting blades 23, and the welded films are cut with connection parts 32 left.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a synthetic resin bag, and more particularly to a method for continuously forming a synthetic resin bag on a long film body by heat welding. The present invention relates to a method and an apparatus for manufacturing a synthetic resin bag that is cut and divided into bags.

[0002]

2. Description of the Related Art Conventionally, in the production of synthetic resin bags,
Usually, a manufacturing apparatus A ′ as schematically shown in FIG. 11 is used.

[0003] The manufacturing apparatus A 'comprises a forming section C for performing heat welding while feeding a synthetic resin film body, and a cutting section D' for cutting and separating each synthetic resin bag B. .

In the forming section C, first, a long synthetic resin film body 2 formed by appropriately laminating various synthetic resins, paper, or aluminum foil so as to obtain required physical properties is used as the raw roll body 1. Supplied.

The long synthetic resin film body 2 is cut into long front and rear wall film bodies 3 and 4 at a separation polymerization section 5, and the long front and rear wall film bodies 3 and 4 are polymerized so as not to be displaced from each other. Sent while being sent.

In FIG. 11, reference numeral 6 denotes a long front and rear wall film body 3,
A bottom gusset supply unit inserted between the four gussets 4. The bottom gusset 7 is fed while folding a synthetic resin film body similar to the long synthetic resin film body 2 into a V-shape. ing.

Although not shown, an openable zipper and an opening thread other than the bottom gusset 7 may be inserted between the long front and rear wall film bodies 3 and 4 similarly to the bottom gusset 7.

After the bottom gusset 7 is inserted into the required position between the long front and rear wall film bodies 3 and 4, heat welding is performed by the heaters 8 and 9 to the required shape to form a synthetic resin bag B shape.

In FIG. 11, the arrangement of the heaters 8 and 9 is shown in a simplified manner. However, in the heat welding, the heat welding process is divided into several times according to the temperature to be used and the shape of the heat welding. At the same time, continuous heat welding is performed while the long front and rear wall film bodies 3 and 4 are pressed by the heaters 8 and 9 having various shapes according to the welding place.

In the following, the long front and rear wall film bodies 3 and 4 which have been subjected to continuous heat welding in the shape of a synthetic resin bag B are referred to as a welded film body 10.

The synthetic resin bag B is made of
Is cut off from the welding film body 10 by punching and cutting by a cutting die d 'of the cutting portion D', and is taken out to a carry-out belt conveyor 11 or the like.

In FIG. 11, reference numeral 12 denotes a winding roll for winding the welded film body 10 from which the synthetic resin bag B has been punched.

[0013]

However, in the above manufacturing apparatus, when punching and cutting each synthetic resin bag from the welded film body, it is necessary to apply tension to the welded film body to withstand the punching pressure. However, it has been difficult to accurately and continuously feed and continuously cut the welded film without causing a feeding deviation and a cutting deviation while applying a certain tension.

As a method of punching and cutting without applying tension to the welded film body, there is a method of arranging a male mold and a female mold at a cutting portion and performing punching and cutting with the same mold.
The cost of the mold was high, which was a major obstacle to reducing the manufacturing cost.

In addition, an apparatus for removing the cut and separated synthetic resin bag from the cutting section is required, and the apparatus itself is increased in size and complexity, and maintenance is complicated.

When a secondary cutting step of separately cutting into a required shape is performed after the provisional cutting to avoid an increase in the size of the apparatus, there is a problem that the number of steps increases and the working efficiency decreases. there were.

In particular, when the synthetic resin bag is formed of a thick film or a film containing aluminum foil, or when the synthetic resin bag is provided with an internal structure such as a zipper or an opening thread, the secondary At the time of cutting, it is difficult to cut in a state in which a plurality of synthetic resin bags are stacked, and it is necessary to cut one by one, resulting in very poor work efficiency.

[0018]

In order to solve the above-mentioned problems, according to the present invention, a long front wall film made of a synthetic resin film and a long rear wall film are attached to each other. While polymerizing and feeding in the transport direction, if necessary, a bottom gusset made of a synthetic resin film body,
Alternatively, an openable zipper, an opening thread, etc. are inserted between the long front and rear wall film bodies, and are welded at regular intervals into a container shape to form a continuously molded welded film body of a synthetic resin bag, which is connected at the cutting section. It is another object of the present invention to provide a method of manufacturing a synthetic resin bag, wherein each synthetic resin bag is punched and cut from the welded film body while leaving a portion.

According to the second aspect of the present invention, a long front wall film body and a long rear wall film body made of a synthetic resin film body are superposed on each other and fed in a feeding direction. If necessary, insert a bottom gusset consisting of a synthetic resin film body, or an open / close zipper, an opening thread, etc. between the long front and rear wall film bodies and heat-weld the container at regular intervals to form a container made of synthetic resin. A synthetic resin bag manufacturing apparatus for forming a welded film body in which bags are continuously formed, and a cutting unit for punching and cutting each synthetic resin bag from the welded film body to the synthetic resin bag manufacturing apparatus. An unloading unit consisting of a belt conveyor for unloading the cut synthetic resin bag is provided, and the cutting unit includes a lower table, a cutting blade holding plate, an attachment portion of the cutting blade holding plate, and the attachment portion. It consists of a mechanism to move up and down. A metal band-shaped cutting blade is arranged in a cutting shape on the blade holding plate, and an uncut portion is formed in the band-shaped cutting blade, and punching and cutting is performed while leaving a connecting portion in the welded film body. To provide a synthetic resin bag manufacturing apparatus.

Further, as described in the third and fourth aspects, at the time of punching and cutting, the synthetic resin bag end protruding from the cut portion toward the discharge portion is pressed from above onto the upper surface of the belt conveyor of the discharge portion. It is also characterized in that it has a pressing body, and that the pressing body is provided in the attachment portion of the cutting section.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION The method and apparatus for manufacturing a synthetic resin bag according to the present invention is a method for punching and cutting each synthetic resin bag from a long welded film body which is continuously heat-welded into a synthetic resin bag shape. In the punching and cutting step.

Therefore, the steps before the punching and cutting step are as follows:
It is almost the same as the conventional manufacturing method and manufacturing process.

As described in the related art, first, a long front wall film body and a long rear wall film body made of a synthetic resin film body are superimposed on each other and fed in the feeding direction. At the same time, if necessary, a bottom gusset made of a synthetic resin film body, or an openable zipper, an opening thread, etc. are inserted between the long front and rear wall film bodies and heat-sealed at regular intervals into a container shape to synthesize. This is a welded film body that is continuously formed from a resin bag.

Recognition marks are provided between the respective synthetic resin bags of the welding film body, and the feeding of the welding film body to the cutting process is controlled while recognizing the recognition mark by a recognition device. Make up.

The cutting section comprises a lower base, a cutting blade holding plate, a mounting portion for the cutting blade holding plate, and a mechanism for moving the mounting portion up and down. The welded film body is fed in between, and in conjunction with the vertical movement of the mechanism, the welded film body fed to the upper surface of the lower base is pressed from above by the cutting blade holding plate and cut into each synthetic resin bag. I do.

The cutting blade holding plate is provided with a metal band-shaped cutting blade shaped into a cutting shape, and the cutting blade holding plate is used for punching and cutting. In addition to this, it is possible to perform punching and cutting into an arbitrary shape in the transport direction as well.

In addition, by simply replacing the cutting blade holding plate according to the external shape of each synthetic resin bag, it is possible to cope with synthetic resin bags of various shapes and not to use a cutting blade by a mold. As a result, the cost of forming the cutting blade can be reduced, and the manufacturing cost can be reduced.

An elastic body such as urethane foam, which is thicker than the height of the band-shaped cutting blade protruding from the mounting surface, is attached to the surface of the cutting blade holding plate on which the band-shaped cutting blade is provided. By doing so, it is possible to prevent the synthetic resin bag from getting stuck in the band-shaped cutting blade.

The band-shaped cutting blade provided on the cutting blade holding plate is provided with at least one uncut portion such as a minute notch, and is formed by punching and cutting the welded film and the synthetic resin bag. Is cut while leaving the connecting portion between them.

By forming the connecting portion, the remaining portion of the welded film body outside the synthetic resin bag is connected to the synthetic resin bag in a state where the remaining portion is connected to the synthetic resin bag. Can be carried out.

After unloading, the remaining portion of the welded film body connected to the synthetic resin bag is cut apart to separate the remaining portion from the synthetic resin bag, thereby forming a single synthetic resin bag. Can be obtained.

The carry-out section is constituted by a carry-out belt conveyor and a pressing body disposed above the belt conveyor. At this time, the driving speed of the belt conveyor is higher than the feeding speed of the welding film body.

At the time of cutting the welded film body at the cutting section,
A part of the welded film body fed to the cutting section by the feeding roller is in a state of protruding from the cutting section toward the carry-out section.

In this state, the welded film body is cut into the respective synthetic resin bags, and the pressing body is moved up and down in conjunction with the vertical movement of the attachment portion for separation, so that the pressing body is carried out. A part of the welded film body protruding toward the part is configured to be pressed against the upper surface of the belt conveyor from above.

The synthetic resin bag pressed on the upper surface of the belt conveyor is separated from the welding film body by being pulled by the driving of the belt conveyor, is directly conveyed by the belt conveyor, and is mounted on the mounting table.

By adopting the structure of the cutting section and the unloading section, the welding film can be cut without applying tension, and the structure of the cutting apparatus can be simplified.

Further, by disposing the pressing body at the mounting portion, the pressing body can be inevitably linked with the vertical movement of the mounting portion. It is possible to eliminate the need for a mechanism that is linked to movement.

When the synthetic resin bag is completely separated from the welded film body without providing an uncut portion on the band-shaped cutting blade, the remaining portion is completely separated, so that the remaining portion is separated from the cut portion. It cannot be pulled out and remains uncut in the cutting section, making continuous cutting impossible.However, a non-cut section is formed on the band-shaped cutting blade, and punch cutting is performed while the connecting section remains in the welded film body. Thus, continuous cutting can be performed without such inconvenience.

[0039]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the overall configuration of a synthetic resin bag manufacturing apparatus A will be described in detail with reference to FIG.

The synthetic resin bag manufacturing apparatus A includes a forming section C for performing thermal welding while feeding a synthetic resin film body, a cutting section D for cutting and separating each synthetic resin bag B, and a cutting section D. It comprises an unloading section E for unloading the synthetic resin bag B.

(Regarding the molding part C) The construction of the molding part C is almost the same as that of the conventional synthetic resin bag manufacturing apparatus.
Hereinafter, the configuration of the molded portion C will be described in some detail.

In FIG. 1, reference numeral 1 denotes an original fabric roll obtained by winding a long synthetic resin film body 2 into a roll shape. The long synthetic resin film body 2 is made of various synthetic resins so that required physical properties can be obtained. It is formed by appropriately laminating paper, paper, or aluminum foil.

On the front surface of the synthetic resin film body 2, the design of the synthetic resin bag B is printed.
The back surface is subjected to a sealant process, and is wound into a roll to form a raw roll body 1, which is usually supplied in this state.

The printing performed on the long synthetic resin film body 2 is usually performed by printing the front wall pattern and the rear wall pattern of the synthetic resin bag B side by side in the width direction of the long synthetic resin film body 2. The long synthetic resin film body 2 is cut into two rows of strip-shaped film bodies between the front wall design and the rear wall design in the separation polymerization section 5, and each of the long synthetic resin film body 2 and the long front wall film body 3 is cut off. The film body 4 is fed while being polymerized so as not to be shifted from each other.

The bottom gusset supply section 6 folds the synthetic resin film into a V-shape to form a bottom gusset 7.
The gusset 7 is inserted between the long front and rear wall film bodies 3 and 4.

Although not shown, an open / close zipper and an opening thread 7 '(see FIG. 6) other than the bottom gusset 7 are inserted between the long front and rear wall film bodies 3 and 4, similarly to the bottom gusset 7.

The components to be inserted between the long front and rear wall film bodies 3 and 4 are the above-mentioned bottom gusset 7, an opening and closing zipper,
The configuration is not limited to the opening thread 7 ', and a necessary component may be appropriately inserted.

After the necessary components such as the bottom gusset 7, the opening / closing zipper and the opening thread 7 'are inserted into the required positions between the long front and rear wall film bodies 3 and 4, heat welding is performed by the heaters 8 and 9 to the required shape. Is going.

In FIG. 1, the arrangement of the heaters 8 and 9 is shown in a simplified manner. However, as described in the description of the prior art, in the case of heat welding, the temperature to be used and the shape of the heat welding are used. The heat welding process is performed several times according to the welding process, and continuous heat welding is performed while pressing the long front and rear wall film bodies 3 and 4 by the heaters 8 and 9 of various shapes according to the welding place. It is body 10.

Although not shown in FIG. 1, before and after the heat welding to the synthetic resin bag shape by the heaters 8 and 9, a punching step by punching and a step of forming a cleavage line are inserted as necessary. You may.

In the synthetic resin bag manufacturing apparatus A of this embodiment,
As shown in FIG. 2, side edges parallel to the transport direction of the welding film body 10 are cut in advance by the side edge cutting blades 13, 13, and the width direction dimensions are adjusted.

1 and 2, reference numeral 14 denotes a cutting blade attachment portion, 15 denotes a side edge welding film body, 16 denotes a feeding guide body,
Reference numeral 17 denotes a take-up roller for winding the side edge welding film body 15, and F denotes a recognition mark detector.

The recognition mark detector F includes the welding film 1
The configuration is such that the recognition mark P disposed at 0 is recognized, and the feeding control of the welding film body 10 fed to the cutting portion D is performed.

The recognition mark P is disposed between the synthetic resin bags B formed on the welding film body 10 and substantially at the center in the width direction of the welding film body 10 (FIGS. 2 and 5). ), The occurrence of a feeding deviation is small, and the occurrence of a cutting deviation at the cutting portion D can be prevented.

In FIG. 1, R is a feed roller, and in the synthetic resin bag manufacturing apparatus A of the present embodiment, the cutting section is sent out by the feed roller R using the rigidity of the welding film body 10. It is configured to intermittently feed the welding film body 10 to D.

(Regarding Cutting Section D) As shown in the front view of FIG. 3, the cutting section D includes a lower table 18 and a cutting blade holding plate 19.
And the attachment portion 20 of the cutting blade holding plate 19, and the attachment portion 20
And a mechanism section 21 for moving up and down.

The cutting blade holding plate 19 is, as shown in FIG.
A plate 22 having a shape capable of being attached to the attachment portion 20, which is usually made of wood made of plywood, is provided with a metal band-shaped cutting blade 23 on the plate 22. It was done.

The band-shaped cutting blade 23 is a thin metal band-shaped flat plate having one side edge serving as a blade portion 24. The band-shaped cutting blade 23 is formed into a cut shape by bending and bending the band-shaped cutting blade 23. , Are arranged on the cutting blade holding plate 19.

Further, the band-shaped cutting blade 23 of the cutting blade holding plate 19
An elastic body 26 such as urethane foam, which is thicker than the height of the band-shaped cutting blade 23 protruding from the mounting surface 25, is attached to the mounting surface 25 on which the 23
Of the synthetic resin bag B cut by the same band-shaped cutting blade 23
Prevents getting stuck.

The material of the elastic body 26 is not limited to urethane foam, and any material having elasticity, such as foamed polyester or natural rubber, may be used.

As shown in FIG.
As shown in (a), the uncut portion 2 due to the minute notch 28
7 are formed in at least one place.

The non-cut portion 27 is not only formed by the notch 28 shown in FIG. 5A, but also, for example, as shown in FIG. The cutting line 30 (see FIG. 6) formed by the blade portion 24 may be formed in any discontinuous state.

In FIG. 5B, reference numeral 31 denotes a band-shaped cutting blade 2.
3 is a band-shaped cutting blade fixing nail provided on the band-shaped cutting blade 23 in order to dispose 3 on the plate 22.

The above-mentioned cutting blade holding plate 19 is attached to the mounting portion 20, and the welding film body 10 is fed between the lower base 18 and the cutting blade holding plate 19, and interlocks with the vertical movement of the mechanism 21. Then, the welding film body 10 fed to the upper surface of the lower base 18 is pressed from above by the cutting blade holding plate 19 so as to be cut into the respective synthetic resin bags B.

However, since at least one or more (two in this embodiment) non-cutting portions 27 are formed in the blade portion 24 of the band-shaped cutting blade 23, the same band-shaped cutting blade 23 is formed.
After the cutting, the cutting line 30 in which the connecting portion 32 remains at the position of the welded film body 10 corresponding to the uncut portion 27 can be formed (see FIG. 6 or FIG. 2).

As shown in FIG. 2, the connecting portion 32 allows the synthetic resin bag B to
The synthetic resin bag B is pulled out to the carry-out section E with the remaining portion b connected.

As shown in FIG. 6, the remaining portion b is a portion corresponding to a welding margin of the synthetic resin bag B formed by heat welding on the welding film body 10.

(Regarding the Unloading Unit E) As shown in FIGS. 2 and 3, the unloading unit E is provided with a belt conveyor 33 for unloading,
And a pressing body 34 disposed above the belt conveyor 33.

In this embodiment, pressing rollers 35, 35 made of synthetic rubber are used as the pressing members 34, and the pressing rollers 35, 35 are disposed on the holding shaft 36.

The holding shaft 36 is supported by bearings 38, 38 extending from the vertical movement mechanism 37, and the vertical movement mechanism 37 is attached to the attachment section 20 by the mechanism 21 of the cutting section D.
The pressing body 34 is configured to move up and down by moving the holding shaft 36 up and down in conjunction with the up and down movement of.

When the attachment portion 20 moves up and down for cutting at the cutting portion D, the welding film 1
0 is stopped, and in this state, the welding film body 10 of the cutting portion D is cut, and the welding film body 10 protruding from the cutting portion D toward the carry-out portion E is pressed by a pressing roller as a pressing body 34. Belt conveyor 3 by 35,35
3 Lightly press on the upper surface (see FIG. 2).

In FIG. 3, M is a drive motor for driving the belt conveyor 33.
3 is driven at a speed higher than the feeding speed of the welding film body 10 by the feeding roller R.

The synthetic resin bag B cut off from the welding film body 10 at the cutting portion D is pressed against the upper surface of the belt conveyor 33 by the pressing rollers 35, 35, and is pulled by the drive of the belt conveyor 33 to be cut. It is pulled out from D, transported as it is, and mounted on the mounting table 39.

By forming the cutting section D and the unloading section E as described above, the welding film body 10 can be reliably cut without applying tension. The resin bag B can be taken out.

However, when the synthetic resin bag B is separated from the welding film body 10 without providing the uncut portion 27 on the band-shaped cutting blade 23, the remaining portion b is completely cut off at the cut portion D. However, the remaining portion b could not be taken out from the cut portion D, and the remaining portion b was left in the cut portion D, so that continuous cutting was impossible.

Then, by connecting the synthetic resin bag B and the remaining portion b with the connecting portion 32, the unloading portion E pulls out the synthetic resin bag B and also takes out the remaining portion b together to perform continuous cutting. It is possible.

The drawn synthetic resin bag B and the remaining portion b
Is conveyed by the belt conveyor 33, is placed on the mounting table 39, and then the remaining portion b is cut off from the synthetic resin bag B to make the synthetic resin bag B alone.

Since the synthetic resin bag B and the remaining portion b are connected only by one or a plurality of minute connecting portions 32, the remaining portion b can be easily cut off from the synthetic resin bag B. Can be separated from each other.

As another embodiment of the unloading section E, FIG.
As shown in FIG. 6, the welding film body 10 extruded from the cutting portion D by the feeding by the feeding roller R is pressed so that the cutting lines 30a and 30b are positioned between the cutting portion D and the pressing body 34. A body 34 may be provided.

The connecting portions 32a and 32b are provided on the cutting lines 30a and 30b, respectively, so that the feeding roller R can send the cutting lines D from the cutting portion D.

Further, one of the connecting portions 32a, 32b of the cutting lines 30a, 30b is connected to the other connecting portion 32b,
The width of the connection is made shorter than 32a. In this embodiment,
Of the two cutting lines 30a and 30b, the connecting portion 32b formed on the cutting line 30b located on the cutting portion D side is formed shorter.

Then, when the welding film 10 is pressed by the cutting blade holding plate 19 of the cutting portion D, and the cutting lines 30 a and 30 b are formed on the welding film body 10, the elastic body 26 disposed on the cutting blade holding plate 19 is used. The welding film body 10 is in a pressed state. In this state, when the synthetic resin bag B is pressed against the belt conveyor 33 by the pressing body, the belt conveyor 33 is driven to move the cutting portion D and the pressing body 34. A tensile force can be applied to the welding film body.

This pulling force is applied to the cutting lines 30a and 30b.
The synthetic resin bags B can be separated from the welded film body 10 by acting on the connecting portions 32a and 32b disposed in the first and second connecting portions 32b having a shorter connecting width. .

The difference in the width of the connection between the connecting portions 32a and 32b is adjusted by the length of the uncut portion 27 formed on the band-shaped cutting blade 23.

By disposing the pressing body 34 as described above, for example, even if the cutting interval is short,
A synthetic resin bag manufacturing apparatus A can be used.

As another embodiment of the unloading section E, instead of providing the vertical movement mechanism section 37, as shown in the plan view of FIG. 8A and the front view of FIG. A mounting body 20 is provided with a pressing body holding part 40, and the pressing body holding part 40
The pressing roller 35 may be provided continuously via the holding arm 41.

By disposing the pressing roller 35 in this manner, the pressing roller 35 moves up and down in conjunction with the up and down movement of the attachment section 20, and the synthetic resin bag B located on the upper surface of the belt conveyor 33 is moved from above. The synthetic resin bag B can be pulled out.

The plan view of FIG. 9A and the plan view of FIG.
As shown in the front view of (b), a pressing plate 42 made of a plate is directly extended on the attachment portion 20, and is made of a synthetic resin located on the upper surface of the belt conveyor 33 in conjunction with the vertical movement of the attachment portion 20. Bag B
May be configured to be pressed from above.

In FIG. 8B and FIG. 9B, the cutting blade holding plate 19 attached to the attachment portion 20 is drawn in a simplified manner, and only the band-shaped cutting blades 23 are shown. I have.

The plate used for the pressing plate 42 may be made of metal or plastic, and the synthetic resin bag positioned on the upper surface of the belt conveyor 33 when the mounting portion 20 reaches the lowermost position. Forming is performed so that B is pressed from above.

By disposing the pressing roller 35 and the pressing plate 42, which are the pressing members 34, on the attachment portion 20 of the cutting section D, the vertical movement mechanism section 37 is not provided in conjunction with the vertical movement of the cutting section D. Also, the pressing body 34 can be linked to the vertical movement of the cutting section B, so that the configuration of the unloading section E can be simplified and maintenance can be facilitated.

(Other Embodiments) In the above embodiment,
Although the side edge welding film body 15 parallel to the transport direction of the welding film body 10 is cut off in advance, the dimensions in the width direction are adjusted, and then cut into the respective synthetic resin bags B, as another embodiment. As shown in FIG. 10, the cutting line 30 'of the entire outer peripheral edge of the synthetic resin bag B' may be formed at one time by one cutting at the cutting portion D.

A discontinuous portion is also formed at the cutting line 30 'by the connecting portion 32', and the separated synthetic resin bag B 'is formed.
And the remaining portion b 'around the synthetic resin bag B' is cut into a connected state.

Further, a band-shaped cutting blade 23 'for separation is provided on the cutting blade holding plate 19, and the welded film body 10 on which the cutting line 30' in the shape of the synthetic resin bag B 'is formed is removed.
Cut each synthetic resin bag B 'surrounded by the remaining portion b'.

In the synthetic resin bag manufacturing apparatus A of the present invention, in order to separate the synthetic resin bag B from the welding film body 10, the band-shaped cutting blade 23 adapted to the outer shape of each synthetic resin bag B is used. Since the cutting is performed by punching and cutting using the cutting blade holding plate 19 having the same, it is possible to cope with a synthetic resin bag B having any shape, and the versatility of the synthetic resin bag manufacturing apparatus A can be improved.

Further, by using the cutting blade holding plate 19 having the band-shaped cutting blade 23 instead of the cutting blade using a die as the cutting blade used for cutting, the production cost of the cutting blade can be reduced, and the equipment investment is reduced. Thus, a wide variety of synthetic resin bags B can be manufactured.

Further, since the synthetic resin bag manufacturing apparatus A can be cut continuously, productivity can be improved as compared with the conventional manufacturing method.

[0098]

According to the present invention, the following effects can be obtained.

When the welded film body is cut, by cutting while leaving the connecting portion between the synthetic resin bag and the remaining portion, the remaining portion can be pulled out from the cutting portion together with the synthetic resin bag, Continuous cutting can be performed without applying tension to the welded film body.

Since a mechanism for applying tension to the welded film body can be eliminated, the mechanism of the apparatus can be simplified, and the maintenance of the cut section can be facilitated, and the workability can be improved. .

In particular, a pressing force strong against cutting pressure, such as a synthetic resin bag having an internal structure such as a zipper or an opening thread, or a synthetic resin bag using a rigid film body such as an aluminum foil. Even if it is a synthetic resin bag that needs to be manufactured, it is possible to reliably separate and form each synthetic resin bag by configuring it to continuously perform from molding to cutting of the welded film body. Performance can be improved.

By performing the cutting of the welding film body by punching and cutting with a metal band-shaped cutting blade, a cutting die can be prepared at low cost, and not only in the width direction of the welding film body but also in the feeding direction. In any of the above, any cutting shape can be adopted.

By simply replacing the cutting blade holding plate attached to the cutting section, it is possible to perform cutting corresponding to various container shapes, and it is possible to cope with the production of various types at low cost.

The synthetic resin bag which has been cut off by having a pressing body for pressing the end portion of the synthetic resin bag projecting from the cutting portion toward the unloading portion from the cutting portion to the upper surface of the belt conveyor of the unloading portion from above. Can be easily taken out of the cut portion.

Since the pressing body for discharging the detached synthetic resin bag is provided at the attachment portion of the cutting portion, the pressing body is moved up and down in conjunction with the up and down movement of the attachment portion. Therefore, the structure of the carrying-out section can be simplified, and maintenance can be facilitated, so that workability can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of a synthetic resin bag manufacturing apparatus according to the present invention.

FIG. 2 is an explanatory view of a main part of a synthetic resin bag manufacturing apparatus according to the present invention.

FIG. 3 is a front view of a cutting section and a carry-out section of the synthetic resin bag manufacturing apparatus according to the present invention.

FIG. 4 is a perspective view of a cutting blade holding plate.

FIG. 5 is an explanatory view of a non-cut portion provided on the band-shaped cutting blade.

FIG. 6 is an explanatory diagram of a synthetic resin bag cut by the synthetic resin bag manufacturing apparatus according to the present invention.

FIG. 7 is an explanatory view of another embodiment of the carrying-out section.

FIG. 8 is an explanatory view of another embodiment of the carrying-out section.

FIG. 9 is an explanatory view of another embodiment of the carrying-out section.

FIG. 10 is an explanatory view of a main part of a synthetic resin bag manufacturing apparatus according to another embodiment.

FIG. 11 is a schematic explanatory view of a conventional synthetic resin bag manufacturing apparatus.

[Explanation of symbols]

 Reference Signs List A Synthetic resin bag manufacturing device B Synthetic resin bag b Residual part C Molding part D Cutting part E Carrying part F Recognition mark detector P Recognition mark 10 Welding film body 13 Side edge cutting blade 14 Cutting blade attachment part 15 Side edge Welding film body 16 Feeding guide body 18 Lower base 19 Cutting blade holding plate 23 Band-shaped cutting blade 30 Cutting line 32 Connecting part 33 Belt conveyor 34 Pressing body 35 Pressing roller 36 Holding shaft 38 Bearing

Claims (4)

[Claims] 1. A long front wall film body and a long rear wall film body made of a synthetic resin film body are superposed on each other and fed in the transport direction, and if necessary, made of a synthetic resin film body. Insert the bottom gusset or open / close zipper, opening thread, etc. between the long front and rear wall film bodies, and heat-weld it into a container shape at regular intervals to form a continuously molded welded film body of a synthetic resin bag. A synthetic resin bag manufacturing method, comprising punching and cutting each synthetic resin bag from the welded film body while leaving a connecting portion in the portion. 2. A long front wall film body and a long rear wall film body made of a synthetic resin film body are superposed on each other and fed in the transport direction, and if necessary, made of a synthetic resin film body. By inserting a bottom gusset or opening / closing zipper, opening thread, etc. between the long front and rear wall film bodies and heat-welding them at regular intervals into a container shape, a synthetic resin bag is formed continuously to form a welded film body A synthetic resin bag manufacturing apparatus, comprising: a cutting section for punching and cutting each synthetic resin bag from a welding film body; and a belt for carrying out the cut synthetic resin bag. An unloading section consisting of a conveyor is arranged, and the cutting section is composed of a lower base, a cutting blade holding plate, an attaching portion of the cutting blade holding plate, and a mechanism for moving the attaching portion up and down,
A metal band-shaped cutting blade is arranged in a cutting shape on a cutting blade holding plate, and an uncut portion is formed in the band-shaped cutting blade, and punching and cutting are performed while a connecting portion remains in a welded film body. Synthetic resin bag manufacturing equipment. 3. A pressing body for pressing an end portion of a synthetic resin bag projecting from a cutting portion to a discharge portion side at the time of punching and cutting from above to an upper surface of a belt conveyor of the discharge portion. Synthetic resin bag manufacturing equipment. 4. The synthetic resin bag manufacturing apparatus according to claim 3, wherein the pressing body is provided at an attachment portion of the cutting portion.