JP2001315797A - Bag with having side gazette and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bag having a side gazette in which a rigid bag bottom portion melted and adhered to the lower end of the bag is installed and this has a bag opening portion that is positioned at the upper part of a commodity storing chamber and can be freely opened or closed by a seal opening piece. SOLUTION: Each of both sides of a bag member having both front and rear bag surfaces constituted by front and rear films is provided with a first gazette and a second gazette bent and formed in a substantial V-shaped sectional form toward a commodity storing chamber inside the bag. A header portion is formed by a thick core material sheet integrally arranged at least an upper part of the bag. The bag is provided with the bag bottom part positioned at the lower end and having the front and rear films. There is provided a bag opening portion positioned below the header part and communicated with the commodity storing chamber through a slit for use in cutting and opening the front film part in a width direction of the front bag surface. Further, there is provided the seal opening piece suspended down in a vertical direction to cover the bag opening part from near the header and freely adhered to the front bag surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag with side gussets provided with gussets on both sides and a method of manufacturing the same.

[0002]

2. Description of the Related Art Bags with side gussets have been proposed which allow a large storage space for goods.

When a bag with such a side gusset is made of a synthetic resin film, a tube having a gusset part which is bent in a substantially V-shaped cross section on both sides is provided at intervals in the longitudinal direction. A configuration is employed in which the bag is separated in the width direction by opening, whereby a single bag is obtained.

[0004] In order to provide a bag which can be suspended and displayed in a state in which the product is packaged, even in a bag with a side gusset, a header portion provided with a core material sheet is formed on the top of the bag. For this reason, the bag body with the side gusset is always always limited to the bottom-opening bag body having the bottom part opened.

[0005]

In the conventional bottom-opening type bag body, after storing goods in the bag body with the bottom part opened, the bottom part is closed. The closing means may be a heat sealing method in which the front and back film portions of the bag are welded and sealed to each other after the product is stored. However, considering the convenience of opening the user, the heat sealing method is not preferable, and a detachable adhesive means such as an adhesive is used. It is desirable to provide an openable and closable sealing piece provided with.

However, bags with side gussets are
Originally, since the purpose is to store a bulky product, the weight of the product is relatively large, and there is a problem that the sealing piece with the opening at the bottom closed cannot withstand the load of the product. In particular, in a sales form in which it is desired that the customer opens the product displayed at the store and removes it from the bag and examines it, the customer abandons the purchase of the product and attaches the sealing piece casually when inserting the product into the bag again. It is expected that
It is feared that the product easily falls off from the displayed bag due to poor adhesion.

[0007]

SUMMARY OF THE INVENTION The present invention is directed to a bag with side gussets, which has a rigid bag bottom welded to the lower end of the bag, and is located at the top of a product storage chamber by a sealing piece. It is an object of the present invention to provide a bag having a bag opening which can be opened and closed.

Therefore, the bag with the side gusset of the present invention is constituted as a means by forming the front and back film portions on both sides of the bag body having a front and back film surface, each having a substantially V-shaped cross section toward the inner product storage room. In a configuration including a bent first gusset portion and a second gusset portion, and a header portion provided with a thick core sheet integrally provided at least on an upper portion of the bag body, the bag body is located at a lower end. A bag opening having a bag bottom portion on which the front and back film portions are welded together, and a bag opening portion which is located below the header portion and communicates with the product storage chamber through a slit which cuts the front film portion in the width direction of the front bag surface. And a sealing piece extending downward from the vicinity of the header portion so as to cover the opening of the bag and adhering freely to the front bag surface.

The manufacturing method according to the present invention is configured as a first means for manufacturing the bag with the side gussets. The manufacturing method according to the present invention is characterized in that a band-shaped film provided with a core material sheet continuously or intermittently in a longitudinal direction is formed. A folding step of forming the front and back film portions by folding along the axis, forming a folded portion on one side edge, and forming a short side edge and a long side edge on the other side edge, and the folded portion. A first gusset portion is formed by bending inward into a substantially V-shaped section, and a second gusset portion is formed by bending the long side edge inward into a substantially V-shaped section. A gusset forming step of superposing the free end of the long side edge constituting the open end of the second gusset part on the free end of the short side edge, and welding the superposed free end to form the front and back film portions. No. on both sides of the A gusseted tube forming step of forming a tube body having a gusset part and a second gusset part, an incision step of incising the tube body by forming a slit in the width direction of the front film part, and a tape-shaped film formed of the tube A seal that is fed out from the cross direction with respect to the front film portion of the body, welds the vicinity of the side edge of the tape-shaped film in the width direction of the front film portion, and cuts and separates the tape-shaped film at the side edge of the tube. A piece forming step, and then, a welding / separating step of forming the bottom seal portion by welding the tube body in the width direction and dividing the tube body in the transverse direction to make the bottom seal portion the bag bottom. On the point.

The manufacturing method of the present invention is configured as a second means. The front and back film is formed by folding a strip-shaped film provided with a core sheet continuously or intermittently in a longitudinal direction along a longitudinal axis. Forming a folded portion on one side edge and forming a short side edge and a long side edge on the other side edge, and folding the folded portion inwardly into a substantially V-shaped section. While forming the first gusset part by bending, the second gusset part is formed by bending the long side edge inwardly into a substantially V-shaped cross section,
A gusset forming step in which the free end of the long side edge constituting the open end of the second gusset portion is superimposed on the free end of the short side edge, and the superposed free end is welded to form the front and back film portions. A tube forming step with a gusset that forms a tube body having a first gusset part and a second gusset part on both sides, an incision step of cutting the tube body by forming a slit in the width direction of the front film part, and a tube A bag bottom forming step of forming a bottom seal portion by welding the body in the width direction; and cutting off the front film portion by leaving only the back film portion of the tube body in the vicinity of the bottom seal portion. Strip preparing step of forming a scheduled header section by a front film section facing the section and a core sheet superposed on the front film section, and forming a planned sealing strip section by the remaining back film section. Forming a sealing piece along the bottom seal portion in the width direction, folding the sealing piece portion over the header portion, and welding the sealing piece in the width direction. The above-mentioned bag body is obtained by performing the bag bottom portion forming step, the sealing piece preparing step, and the sealing piece forming step at intervals in the longitudinal direction of the tube body.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings.

(First Embodiment) FIG. 1 shows a first embodiment of a bag with side gussets of the present invention, and a method for manufacturing the bag is shown in FIGS. 2 and 3.

(Structure of Bag) The bag body 1 has front and back film portions 3 and 4 sandwiching a product storage room 2 to form a front and back bag surface, and has a substantially V-shaped cross section on both sides toward the product storage room 2. It has a bent first gusset part 5 and a second gusset part 6, and a thick core material sheet 7 is superimposed on at least one inner surface of the front and back film parts 3, 4, in the illustrated example, on the inner surface of the front film part 3. The bag 1 is formed by the upper end region of the core sheet 7.
At least at the upper portion of the header portion. Normal,
The front and back film portions 3 and 4 are made of a thin synthetic resin film, and the core sheet 7 is made of a relatively thick synthetic resin sheet or synthetic paper. In the illustrated embodiment, the gusset portions 5 and 6 on both sides extend over the entire length of the bag body 1 including the header portion 8. The header portion 8 includes a hanging hole formed through the front and back film portions 3 and 4 including the core material sheet 7 or a notch formed hook or the like so as to enable the hanging display of the bag body 1. Means 9 are formed.

The bag 1 has a bag bottom 10 at the lower end where the front and back film portions 3 and 4 are welded. In the case of the illustrated embodiment, the front and back film portions 3 and 4 are welded to the bag bottom portion 10 in a sandwich shape with the core material sheet 7 interposed therebetween.

A gusset part 5 is provided below the header part 8.
6, a slit for cutting the front film portion 3 in the width direction of the front bag surface is formed, thereby forming a bag opening 11 communicating with the product storage room 2. In the case of the illustrated embodiment, the bag opening 11 formed of a slit is formed in the front film portion 3 in order to enable communication with the product storage room 2 from outside the front film portion 3.
The slit is extended to the gusset portions 5 and 6 while leaving only the back film portion 4. However, when the core material sheet 7 is superposed on the back film portion 4 and the product storage room 2 is formed between the core material sheet 7 and the front film portion 3, only the front film portion 3 is cut out. Thus, the bag opening 11 may be formed.

A sealing piece 12 extends downward from the vicinity of the header 8 so as to cover the bag opening 11. That is, a portion near the upper end of the sealing piece 12 above the bag opening 11 is welded 13 in the width direction of the front film portion 3, and an adhesive means 14 is provided at a free end (lower inner surface) of the sealing piece 12. The welding 13 in the width direction enables mutual welding between the sealing film 12 and the front film portion 3 and also mutual welding between the front film portion 3 and the core material sheet 7. Therefore, the core material sheet 7 is integrated with the front and back film portions 3 and 4 at the welded portion 13 and the bag bottom portion 10. The bonding means 14 is a known one in which a pressure-sensitive adhesive such as an adhesive is covered with a release tape.

In this embodiment, the product storage room 2
The bag 1 has an input port 15 opened at the upper end. Therefore,
After storing the product in the bag body 1, the inlet 15 is closed by welding the back film portion 4 and the upper edge of the core material sheet 7, and the bonding means 14 of the sealing piece 12 is attached to the front film portion 3.
The bag opening 11 is sealed by adhering to the bag.

(Structure of the manufacturing method) A method of manufacturing such a bag with side gussets will be described. As shown in FIG. 2A, a belt-shaped strip having a continuous core material sheet 7a in the longitudinal direction is provided. By folding the film 1a along the longitudinal axis, the front and back film portions 3a and 4a are formed, and a folded portion 16 is formed on one side edge, and a short side edge portion 17 is formed on the other side edge.
Then, a long side edge 18 is formed (turning step). It is preferable to transfer the core material sheet 7a in a state where the core material sheet 7a is welded to a predetermined portion of the strip-shaped film 1a. However, the core material sheet elongate body 7a and the strip-shaped film 1a may be transferred in a state of being overlapped. .

Subsequently, as shown in FIG. 2B, the first gusset portion 5a is formed by bending the folded portion 16 inward in a substantially V-shaped section, and the long side edge portion 18 is formed. Is bent inwardly into a substantially V-shaped section to form a second gusset portion 6a, and the free end 18a of the long side edge portion 18 constituting the open end of the second gusset portion is connected to the short side edge portion 17a. (The gusset forming step). In forming the first gusset portion 5a, one side edge of the core sheet 7a serves as a bending guide edge.

Thereafter, as shown in FIG. 2 (C), the polymerized free ends 17a, 18a are blown off by a fusing blade 19 and welded to form first gusset portions on both sides of the front and back film portions 3a, 4a. The tube body 20 including the 5a and the second gusset part 6a is formed (tube forming step with gusset).

Before and after the tube forming step, and preferably immediately after, as shown in FIG. 2C, a slit 1 in the width direction is formed in the front film portion 3a and the core sheet 7a.
The tube 20 is incised by forming 1a (incision step). In the case of the illustrated example, the protection plate 2 inserted from between the free ends 17a and 18a of the film before reaching the fusing blade 19 so that the slit 11a does not reach the back film portion 4a.
0a is interposed between the core material sheet 7a and the back film portion 4a, and the slitter 21 composed of a fusing blade or a cutting blade is lowered on the protective plate 20a, so that the back film portion 3a to the gusset portions 5a, 6a. To form a slit 11a.

Thereafter, as shown in FIG. 3, the slit film 11a provided with the bonding means 14a near one side edge is fed out from the cross direction with respect to the front film portion 3a of the tube body 20, thereby forming the slit 11a. The tape-like film 12a is welded 13a in the width direction of the front film portion 3a in the vicinity of the other side edge of the tape-like film 12a.
a is positioned at the side edge of the tube body 20 and divided, thereby forming the sealing piece 12 (sealing piece forming step).

The vicinity of the welding 13a (except for the slit 11
On the side opposite to (a), the suspension means 9a is formed by punching out the tube body 20 with a fusing blade or the like (suspension means processing step). As a result, the region of the tube body 20 where the suspension means 9a is provided constitutes the pre-header 8a. The suspension means processing step may be performed before or after the sealing piece forming step.

The tube body 20 is provided with the pre-header section 8a.
Or, in the vicinity thereof (but on the side opposite to the sealing piece 12), the front and back film portions 3a, 4a with the core material sheet 7a interposed therebetween.
Are welded in the width direction to form the bottom seal portion 10a, and the tube body 20 is cut transversely along the bottom seal portion 10a (weld cutting step). The formation of the bottom seal portion 10a may be performed before or after the sealing piece forming step, but the division of the tube body 20 is preferably performed after the bottom seal portion 10a is formed.

The above-described incision step, sealing piece forming step, suspension means processing step, and fusing and cutting step are performed during the intermittent transfer of the tube body 20 in the longitudinal direction. The bag with the side gusset shown in FIG.
It can be obtained one by one from 0.

(Second Embodiment) FIG. 4 shows a second embodiment of a bag with side gussets of the present invention, and the method for producing the bag is shown in FIGS.

(Structure of Bag) The structure of the bag with the side gusset is basically the same as that of the first embodiment shown in FIG. 1, and therefore, only the different components will be described. In the embodiment, the charging port 15 is provided at the upper end of the bag body 1, whereas in the second embodiment, as shown in FIG.
The upper portion of the product storage room 2 is closed by welding the back film portion 4 to the core material sheet 3 in the width direction above the bag opening portion 11. Further, the front and back film portions 3 and 4 are welded together with the core material sheet 3 sandwiched along the upper edge of the bag 1.
Three. In addition, only one of the welds 22 and 23 may be provided. Other configurations are the same as those of the first embodiment shown in FIG. 1, and thus the above description is referred to.

(Structure of Manufacturing Method) A method of manufacturing such a bag with side gussets will be described.
The gusset forming step, the tube forming step with the gusset, and the incision step are shown in FIG. 2 (A), FIG. 2 (B), FIG.
Since this is the same as the first embodiment described based on (C), the drawing and the above description are referred to.

Thereafter, a sealing piece forming step as shown in FIG. 5 is performed. The sealing piece forming step is the same as that described in the first embodiment, and the tape-like film 12a provided with the bonding means 14a near one side edge is formed into a tube 2
0, the slit 11a is covered by being fed out from the cross direction with respect to the front film portion 3a, and the vicinity of the other side edge of the tape-like film 12a is welded 13a in the width direction of the front film portion 3a. 3a is located at the side edge of the tube body 20 and cut off, thereby forming the sealing piece 12. Further, similarly to the first embodiment, a suspension means processing step is performed, and the suspension is performed by punching out the tube body 20 with a fusing blade or the like in the vicinity of the welding 13a (the side opposite to the slit 11a). Means 9a are formed,
As a result, the region of the tube body 20 where the suspension means 9a is provided constitutes the pre-header 8a.

In the second embodiment, at the same time as or before or after the welding 13a of the tape-like film 12a is performed, the back film portion 4a is formed with the width of the core material sheet 7a corresponding to the position facing the welding 13a. In the direction of welding 22a. Therefore, this point is different from the first embodiment.

The tube body 20 is provided with the pre-header section 8a.
Or, in the vicinity thereof (but on the side opposite to the sealing piece 12), the front and back film portions 3a, 4a with the core material sheet 7a interposed therebetween.
Are welded in the width direction to form the bottom seal portion 10a (welding step). This is the same as in the first embodiment.

By the way, after the bottom seal portion 10a is formed, the tube body 20 is cut transversely along the bottom seal portion 10a (cutting step). This point is the same as in the first embodiment. In the second embodiment, the bottom seal portion 10a is divided so as to be divided into two parts, so that one is left as the bottom seal portion 10a, and the other part is used to form a weld 23a along the divided edge of the header scheduled portion 8a. Let me know.

The above-described incision step, sealing piece forming step, suspension means processing step, and fusing / cutting step are performed during the intermittent transfer of the tube body 20, and these steps are performed at predetermined intervals in the longitudinal direction of the tube body 20. By carrying out, the bags with the side gussets shown in FIG. 4 are obtained one by one from the tube body 20.

(Third Embodiment) FIG. 6 shows a third embodiment of a bag with side gussets of the present invention, and the method of manufacturing the bag is shown in FIGS. 2 and 7.

(Structure of Bag) The bag 1 has front and back film portions 3 and 4 sandwiching the product storage room 2, and has a substantially V-shaped cross section on both sides toward the product storage room 2. It has a bent first gusset part 5 and a second gusset part 6, and a thick core material sheet 7 is superimposed on at least one inner surface of the front and back film parts 3, 4, in the illustrated example, on the inner surface of the front film part 3. The bag 1 is formed by the upper end region of the core sheet 7.
At least at the upper portion of the header portion. Normal,
The front and back film portions 3 and 4 are made of a thin synthetic resin film, and the core sheet 7 is made of a relatively thick synthetic resin sheet or synthetic paper. In the illustrated embodiment, the gusset portions 5 and 6 on both sides extend over the entire length of the bag body 1 including the header portion 8. The header portion 8 includes a hanging hole formed through the front and back film portions 3 and 4 including the core material sheet 7 or a notch formed hook or the like so as to enable the hanging display of the bag body 1. Means 9 are formed.

The bag 1 has a bag bottom 10 to which the front and back film portions 3 and 4 are welded at the lower end. In the case of the illustrated embodiment, the front and back film portions 3 and 4 are welded to the bag bottom portion 10 in a sandwich shape with the core material sheet 7 interposed therebetween.

Below the header section 8, the front film section 3 is provided.
Is formed in the width direction of the front bag surface, thereby forming a bag opening 11 communicating with the product storage room 2. In the case of the illustrated embodiment, in order to be able to communicate with the product storage room 2 from the outside of the front film part 3, the bag opening part 11 formed of a slit cuts out both the front film part 3 and the core material sheet 7 and the back film. The slit is extended to the gusset parts 5 and 6, leaving only the part 4. However, when the core material sheet 7 is superposed on the back film portion 4 and the product storage room 2 is formed between the core material sheet 7 and the front film portion 3, only the front film portion 3 is cut out. Thus, the bag opening 11 may be formed.

The back film portion 4 is located above the bag opening 11 and is welded 22 in the width direction of the core material sheet 7, thereby closing the upper part of the product storage room 2. The back film part 4
Is extended long, and the extended portion is folded back so as to surround the header portion 8 to form a skin portion 12b. The skin portion 12b is positioned above the bag opening portion 11 so that the surface film portion 3 Is welded 13 in the width direction of
Piece 1 extending downward so as to cover bag opening 11
2 is formed, and an adhesive means 14 is provided on the inner surface of the free end (the inner surface of the lower end) of the sealing piece 12. The suspension means 9 is provided so as to penetrate the header section 8 including the skin section 12b. The welding 13 enables mutual welding of the sealing film 12 and the front film portion 3 and also mutual welding of the front film portion 3 and the core material sheet 7. Therefore, the core material sheet 7 has the front and back film portions 3 and 4 at the welded portions 13 and 22 and the bag bottom portion 10.
It is integrated into. The bonding means 14 is a known one in which a pressure-sensitive adhesive such as an adhesive is covered with a release tape.

(Structure of Manufacturing Method) A method of manufacturing such a bag with side gussets will be described.
The gusset forming step, the tube forming step with the gusset, and the incision step are shown in FIG. 2 (A), FIG. 2 (B), FIG.
Since this is the same as the first embodiment described based on (C), the drawing and the above description are referred to.

Thereafter, as shown in FIG. 7A, the tube body 20 is welded in the width direction to thereby form the bottom seal portion 10.
a is formed (bag bottom forming step). Before and after this bag bottom portion forming step, the gusset portion 5 except for the back film portion 4a of the tube body 20 near the bottom seal portion 10a.
By cutting off the front film portion 3a including a and 6a, a pre-header portion 8a is formed by the front film portion 3a facing the cut portion and the core sheet 7a superposed on the front film portion 3a, and the remaining back film portion is formed. Bonding means 1 in the width direction of the inner surface of 4a
By providing the sealing film 4a, the expected sealing piece 12b is formed by the back film portion 4a (sealing piece preparing step).

Further, after dividing the expected sealing piece 12b in the width direction along the bottom seal part 10a, as shown in FIG. 7B, the expected sealing piece 12b is placed on the expected header part 8a. The sealing piece 12 is formed by folding and welding 13a in the width direction (sealing piece forming step). At this time, the back film portion 4a is welded 22a to the expected header portion 8a. Therefore, the header section 8 is completed from the header section 8a, and the suspension means 9 is formed on the header section 8 (suspension means forming step).

By performing the above-described cutting step, bag bottom forming step, closing piece preparing step, closing piece forming step and hanging means forming step at intervals in the longitudinal direction during the intermittent transfer of the tube body 20, FIG. Is obtained from the tube body 20 one by one.

(Fourth Embodiment) FIG. 8 shows a fourth embodiment of a bag with side gussets of the present invention, and the method of manufacturing the bag is shown in FIGS. 9 and 10.

(Structure of Bag) The bag 1 has front and back film portions 3 and 4 with the product storage room 2 interposed therebetween, and has a substantially V-shaped section on both sides toward the product storage room 2. It comprises a first gusset part 5 and a second gusset part 6 formed by bending, and is located at the upper part of the bag body 1 and at least one inner surface of the front and back film parts 3 and 4, in the illustrated example, the inner surface of the front film part 3. A thick core material sheet 7 is superposed, and a header portion 8 is formed on the upper portion of the bag body 1 by the core material sheet 7. Although the core sheet 7 is provided on the inner surface of the front film portion 3 in the illustrated example, it may be provided on the opposite side, that is, on the outer surface of the front film portion 3. Normally, the front and back film portions 3 and 4 are made of a thin synthetic resin film, and the core sheet 7 is made of a relatively thick synthetic resin sheet or synthetic paper. In the illustrated embodiment, the gusset portions 5 and 6 on both sides extend over the entire length of the bag body 1 including the header portion 8. The header portion 8 includes a hanging hole formed through the front and back film portions 3 and 4 including the core material sheet 7 or a notch formed hook or the like so as to enable the hanging display of the bag body 1. Means 9 are formed.

The bag 1 has a bag bottom 10 to which the front and back film portions 3 and 4 are welded at the lower end. In the case of the illustrated embodiment, the front and back film portions 3 and 4 are welded to the bag bottom portion 10 in a sandwich shape with the core material sheet 7 interposed therebetween.

The front film portion 3 is provided below the header portion 8.
Is formed in the width direction of the front bag surface, thereby forming a bag opening 11 communicating with the product storage room 2. The slit extends from the front film portion 3 to the gusset portions 5 and 6, leaving only the back film portion 4.

The back film portion 4 is located above the bag opening 11 and is welded 22 in the width direction of the core material sheet 7, thereby closing the upper part of the product storage room 2. The back film part 4
Is extended long, and the extended portion is folded back so as to surround the header portion 8 to form a skin portion 12b. The skin portion 12b is positioned above the bag opening portion 11 so that the surface film portion 3 Is welded 13 in the width direction of
Piece 1 extending downward so as to cover bag opening 11
2 is formed, and an adhesive means 14 is provided on the inner surface of the free end (the inner surface of the lower end) of the sealing piece 12. The suspension means 9 is provided so as to penetrate the header section 8 including the skin section 12b. The welding 13 enables mutual welding of the sealing film 12 and the front film portion 3 and also mutual welding of the front film portion 3 and the core material sheet 7. Therefore, the core material sheet 7 has the front and back film portions 3 and 4 at the welded portions 13 and 22 and the bag bottom portion 10.
It is integrated into. The bonding means 14 is a known one in which a pressure-sensitive adhesive such as an adhesive is covered with a release tape.

(Structure of Manufacturing Method) A method of manufacturing such a bag with side gussets will be described. As shown in FIG. 9A, short core material sheets 7a are spaced apart in the longitudinal direction.
Are folded back along the longitudinal axis so that the front and back film portions 3a, 4a are intermittently provided at intervals.
(a), a folded portion 16 is formed on one side edge, and a short side edge portion 17 and a long side edge portion 18 are formed on the other side edge (folding step). The core sheet 7a is a belt-like film 1.
It is preferable to transfer in a state where it is welded to a predetermined location a.

Subsequently, as shown in FIG. 9B, the first gusset portion 5a is formed by bending the folded portion 16 inward in a substantially V-shaped section, and the long side edge portion 18 is formed. Is bent inwardly into a substantially V-shaped section to form a second gusset portion 6a, and the free end 18a of the long side edge portion 18 constituting the open end of the second gusset portion is connected to the short side edge portion 17a. (The gusset forming step).

Thereafter, as shown in FIG. 9 (C), the polymerized free ends 17a, 18a are blown off by a fusing blade 19 and welded to form first gusset portions on both sides of the front and back film portions 3a, 4a. The tube body 20 including the 5a and the second gusset part 6a is formed (tube forming step with gusset).

Before and after the tube forming step, preferably immediately after, as shown in FIG.
A slit 11a in the width direction is formed in the front film portion 3a at a position near (1) to cut the tube body 20 (cutting step). In the case of the illustrated example, the protective plate 20a inserted from between the free ends 17a and 18a of the film before reaching the fusing blade 19 is inserted between the front and back film portions 3a and 4a so that the slit 11a does not reach the back film portion 4a. And a slitter 21 composed of a fusing blade or a cutting blade is lowered on the protective plate 20a to thereby remove the front film portion 3a.
To the gusset portions 5a, 6a to form a slit 11a.

Thereafter, as shown in FIG. 10 (A), the bottom seal portion 10a is formed by welding the tube body 20 in the width direction at a position spaced from the core material sheet 7a by a predetermined distance (bag). Bottom forming step). Before and after this bag bottom portion forming step, the front film portion 3a including the gusset portions 5a and 6a is cut off except for the back film portion 4a of the tube body 20 located between the bottom seal portion 10a and the core sheet 7a. As a result, the front film portion 3a facing the cut portion and the core material sheet 7a superposed on the front film portion 3a,
a is formed, and by providing the bonding means 14a in the width direction of the inner surface of the remaining back film portion 4a, the expected back piece 12b is formed by the back film portion 4a (sealing piece preparation step).

Further, after the sealing piece expected portion 12b is divided in the width direction along the bottom seal portion 10a, as shown in FIG. 10B, the sealing piece expected portion 12b is connected to the header expected portion 8a.
The sealing piece 12 is formed by folding back on and welding 13a in the width direction (sealing piece forming step). At this time, the back film portion 4a is welded 22a to the expected header portion 8a. Thus, the header section 8 is completed from the header section 8a, and the suspension means 9 is formed on the header section 8 (suspension means forming step).

By performing the above-described incising step, bag bottom forming step, closing piece preparing step, closing piece forming step, and hanging means forming step at intervals in the longitudinal direction during the intermittent transfer of the tube body 20, FIG. Is obtained from the tube body 20 one by one.

(Modified Embodiment) Of course, the present invention is not limited to the illustrated embodiment, and various design changes are possible. For example, in the above embodiment, the bonding unit 1
Although the configuration in which the sealing member 4 is provided on the sealing piece 12 is shown, an adhesive means 14 may be provided on the outer surface of the front film part 3 facing the sealing piece 12. May be provided with the bonding means 14.

[0056]

According to the present invention, although the bag is a bag with a side gusset, it has a rigid bag bottom 10 welded to the lower end of the bag 1 and is located at the top of the product storage chamber 2 to close the sealing piece. Since the bag body provided with the bag opening portion 11 which can be opened and closed by the opening 12 is constituted, the bag member 1 can be repacked after the product is taken out from the bag body 1 by opening and closing the sealing piece 12, and the gusset portions 5, 6 Even in a state where a relatively heavy product is wrapped and displayed in a suspended state by effective use, there is an advantage that there is no risk of the product falling off due to its own weight.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of a bag with a side gusset according to the present invention, wherein (A) is a front view, (B) is a longitudinal sectional view,
(C) is a perspective view.

FIG. 2 shows an embodiment of a bag manufacturing method according to the present invention,
(A) is a perspective view showing a bending step, (B) is a perspective view showing a gusset forming step, and (C) is a perspective view showing a gusseted tube forming step and a cutting step.

FIG. 3 is a perspective view showing a sealing piece forming step and a welding cutting step in the first embodiment of the bag manufacturing method according to the present invention.

4A and 4B show a second embodiment of a bag with a side gusset according to the present invention, wherein FIG. 4A is a front view, FIG.
(C) is a perspective view.

FIG. 5 is a perspective view showing a sealing piece forming step and a welding cutting step in a second embodiment of the bag manufacturing method according to the present invention.

FIG. 6 shows a third embodiment of a bag with a side gusset according to the present invention, wherein (A) is a front view, (B) is a longitudinal sectional view,
(C) is a perspective view.

FIG. 7 shows a third embodiment of the bag manufacturing method according to the present invention, wherein (A) is a perspective view showing a bag bottom portion forming step and a sealing piece preparing step, and (B) is a sealing piece forming step and hanging means forming. It is a perspective view showing a process.

FIG. 8 shows a fourth embodiment of a bag with a side gusset according to the present invention, wherein (A) is a front view, (B) is a longitudinal sectional view,
(C) is a perspective view.

FIG. 9 shows a fourth embodiment of the bag manufacturing method according to the present invention, wherein (A) is a perspective view showing a bending step, (B) is a perspective view showing a gusset forming step, and (C) is a tube with a gusset. It is a perspective view which shows a formation process and a cutting process.

10A and 10B show a third embodiment of a bag manufacturing method according to the present invention, wherein FIG. 10A is a perspective view showing a bag bottom portion forming step and a sealing piece preparing step, and FIG. 10B is a sealing piece forming step and hanging means forming. It is a perspective view showing a process.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bag body 2 Product storage room 3 Front film part 4 Back film part 5, 6 Gazette part 7 Core material sheet 8 Header part 9 Hanging means 10 Bag bottom part 10a Bottom seal part 11 Bag opening part 11a Slit 12 Sealing piece 14 Adhesion means

Claims (3)

[Claims] 1. A first gusset portion and a second gusset portion, each of which has a substantially V-shaped cross section, are formed on both sides of a bag body having front and back film surfaces formed by front and back film portions. In the configuration in which the header portion is provided by a thick core sheet integrally provided at least on the upper portion of the bag body, the bag body includes a bag bottom portion where the front and back film portions are welded and located at the lower end, A bag opening is provided below the header portion and communicates with the product storage room by a slit that cuts the front film portion in the width direction of the front bag surface, and further covers the bag opening from near the header portion. Characterized in that the bag is provided with a sealing piece which is suspended and extended so as to be freely attached to the surface of the outer bag. 2. The method for producing a bag with side gussets according to claim 1, wherein a band-shaped film provided with a core material sheet continuously or intermittently in a longitudinal direction is folded back along a longitudinal axis. A folding step of forming a front and back film portion, forming a folded portion on one side edge, and forming a short side edge and a long side edge on the other side edge, and a substantially V-shaped cross section with the folded portion facing inward The first gusset portion is formed by bending the first gusset portion, and the second gusset portion is formed by bending the long side edge portion inwardly into a substantially V-shaped section. A gusset forming step of overlapping the free end of the long side edge constituting the end with the free end of the short side edge, and welding the overlapped free end to form first gusset portions on both sides of the front and back film portions. With a second gusset part A step of forming a tube with a gusset to form a tube body; a step of incising the tube body by forming a slit in the width direction of the surface film portion; and a direction intersecting the tape-shaped film with respect to the surface film portion of the tube body. And sealing the side of the tape-shaped film in the width direction of the front film part, and positioning the tape-shaped film at the side edge of the tube body to separate the tape-shaped film. A bottom seal portion is formed by welding in a width direction, and the bottom seal portion is made into a bag bottom portion by dividing a tube body in a transverse direction.
A method for producing a bag with side gussets, the method comprising: 3. A method for producing a bag with side gussets according to claim 1, wherein a band-shaped film provided with a core sheet continuously or intermittently in a longitudinal direction is folded back along a longitudinal axis. A folding step of forming a front and back film portion, forming a folded portion on one side edge, and forming a short side edge and a long side edge on the other side edge, and a substantially V-shaped cross section with the folded portion facing inward The first gusset portion is formed by bending the first gusset portion, and the second gusset portion is formed by bending the long side edge portion inwardly into a substantially V-shaped section. A gusset forming step of overlapping the free end of the long side edge constituting the end with the free end of the short side edge, and welding the overlapped free end to form first gusset portions on both sides of the front and back film portions. With a second gusset part A step of forming a tube with a gusset to form a tube body, a step of incising the tube body by forming a slit in the width direction of the surface film portion, and forming a bottom seal portion by welding the tube body in the width direction A bag bottom portion forming step, and by cutting off the front film portion leaving only the back film portion of the tube body in the vicinity of the bottom seal portion, the front film portion facing the cut portion and the core material sheet superimposed on the front film portion Forming a pre-scheduled portion by forming a pre-sealable portion with the remaining back film portion, and separating the pre-sealable portion in the width direction along the bottom seal portion. A sealing piece forming step of folding the scheduled portion onto the header scheduled portion and welding in the width direction, wherein the cutting step, the bag bottom forming step, the sealing piece preparing step, and the sealing piece forming step are performed. Method for producing a bag with side gusset, characterized in that to obtain a bag body according to claim 1 by performing at a longitudinally spacing of the cube body.