JPH06155638A - Manufacture of plastic special bag - Google Patents

Abstract

PURPOSE:To avoid occurrence of defective products due to positional deviation among members and prevent print slip of decorative design by making a plastic special bag of a continuous flat member or a continuous cylindrical member. CONSTITUTION:A decorative design 2 is printed on an outer face base material 1a of a pair of continuous flat members 1 and it is sealed at the center such that the printed face becomes a front face. The opposite face of the center seal face is made to be flat faces 3 and 4, and gusset faces 5 and 6 having valleylike folded parts 5a and 6a are formed therein. The gusset faces 5 and 6 are respectively superposed on the flat faces 3 and 4 and side parts at both sides are sealed with heat so as to form side parts at heat seal sides 7, 7, 8, 8. In order to form parallel heat seal parts 9a and 9b, attachment sealing for pinching an opposing flat face is performed at attachment seal members G, G. Next, corrugated heat seal parts 10... are formed, a center seal part 3a is removed, and end parts of the seal parts 10... are cut, so that a plastic special bag 11 is completed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is used not only for liquids, powders, granules, pastes, sticks and solid products, but also for liquids and jelly-like products to store contents. In this case, the present invention relates to a method of manufacturing a special plastic bag in which the bag body can be self-supporting.

[0002]

2. Description of the Related Art Conventionally, as an example of a plastic special bag having self-supporting property after storing contents, a gusset four-way seal pack 100 as shown in FIG. 10 and a standing pouch type special bag 110 as shown in FIG. It has been commercialized.

Gazette four-sided seal pack 1 shown in FIG.
00 is a gusset member 101 having valley folds inside the container,
101 are opposed to each other, and a pair of flat members 102 and 102 are opposed to each other to heat-seal each side, and the bottom side has a square bottom in a state where contents are stored. It is heat-sealed so as to form a bottom portion to have. A standing pouch-type special bag 110 shown in FIG. 11 has a pair of flat surfaces 111, 111 opposed to each other and heat sealed at their respective sides, and the bottom side thereof has a gusset member 112 having a valley fold inside the container. And a bottom portion is formed by heat-sealing each of them. Therefore, the gusset four-way seal pack 100 and the standing pouch-type special bag 110 as described above have self-supporting property when the contents are stored.

The above-mentioned gusset square seal pack 1
8A, as shown in FIG. 8A, a pair of elongated rectangular flood members 102, 102 made of the above-mentioned laminated base material face each other so that the inner surface base materials face each other, and further the flat member 102, 102 along the long sides of 102, valley fold 101
Gazette member 1 comprising the above-mentioned base material having a and 101a
After scissoring 01 and 101, respectively, as shown in FIG. 8B, the flat members 102 and 102 and the long side portions 103 and 103 on which the gusset members 101 and 101 are overlapped are heat-sealed. At the same time, both ends of the heat seal part 1 of the ship bottom type are arranged in a direction orthogonal to each other.
To form 04. Then, as shown by X in FIG. 8B, the gusset four-way seal type pack 100 as shown in FIG. 8C was completed by cutting in parallel with the ship bottom heat seal portion 104.

On the other hand, a standing pouch type special bag 1
As shown in FIG. 9 (a), 10 is a pair of elongated rectangular flat members 111, 111 made of the above-mentioned laminated base material, facing each other such that the inner surface base materials face each other, and further, the flat member 111, On both sides of the long side of 111, valley folds 112a,
Gazette member 11 made of the base material having 112a
After sandwiching 2, 112 respectively, as shown in FIG. 9B, the flat members 111, 111 and the long side portions 113, 113 on which the gusset members 112, 112 are overlapped are formed into a corrugated shape. Heat seal. Then, thereafter, the flat members 111 and 111 and the gusset members 112 and 112 heat-sealed as described above.
As shown in FIG. 9 (c), the line connecting the opposing peaks of the corrugated heat seal parts 113, 113 is heat-sealed 112 'and then along the longitudinal center line Y. And cut the heat seal parts 113, 113.
The center Z was cut off as a boundary to complete the standing pouch type special bag 110 as shown in FIG. 9 (d).

[0006]

However, as described above, the flat members 111, 111, 102, 102 and the gusset member 112, which are separate bodies, are used for both the gazette four-way seal pack and the standing pouch type special bag. , 112, 101, 101 are manufactured by heat-sealing in combination, the flat member 11
1, 111, 101, 101 and gusset members 112, 1
Defective products may occur due to misalignment between the members 12, 101, 101 or the flat member 11
1, 111, 102, 102 and the gusset member 11
When a product name, a decorative design printing, or the like is applied to each of 2, 112, 102, and 102, a misalignment or a character of the decorative design due to misalignment between the respective members is used. There is a problem that defective products such as misregistration occur.

[0007] Therefore, the present invention has been made in view of the above circumstances, and by manufacturing a plastic special bag from a single member, as described above, between the members when manufacturing a plastic bag made of multiple members. A plastic that can avoid the occurrence of defective products due to the misalignment during the positioning of the above, and at the same time avoid printing misalignment of the decorative design printing that has been caused on the product surface due to the misalignment between the members. An object is to provide a method for manufacturing a special bag.

[0008]

In order to solve the above-mentioned problems, a method of manufacturing a special plastic bag according to a first aspect of the present invention involves center-sealing one long flat member in its longitudinal direction. Second step of forming a tubular gusset surface by folding the center seal surface on which the center seal portion is formed and the surface facing the center seal surface into flat surfaces, and folding both sides of the flat surfaces into the inside thereof. And a third step of superposing each of the gusset surfaces thus formed with the flat surfaces on both sides thereof and heat-sealing both side portions thereof to form four heat-sealing side portions,
The fourth step of performing a geta seal that simultaneously forms two parallel heat seal parts on both sides of the center seal part sandwiching the long member having the heat seal side part, and the geta seal. Wave crests are present in the two heat-sealed portions and in the same plane as the two heat-sealed portions and the heat-sealing side portions in a direction perpendicular to the sealing direction and at regular intervals. A fifth step of forming a corrugated heat seal portion so as to be formed on opposing heat seal side portions, and a step of cutting each of the two heat seal portions and the bottom portion of the corrugated heat seal portion. It is characterized by consisting of six steps.

According to a second aspect of the present invention, there is provided a method for manufacturing a special plastic bag, in which, in order to solve the above-mentioned problems, one long flat member is center-sealed in the lengthwise direction to form a tubular shape. Step, a second step of forming a gusset surface having an inward fold on the facing surface of the center seal portion with one side as the side edge, the center seal portion, and the gusset surface thus formed A third step of forming a center seal processing part and two heat sealing side parts by superposing both side parts of a flat surface on both sides and heat-sealing them, and the center seal processing part and heat seal side parts The wave crests are formed in the center seal processing part and the opposite heat sealing side parts in the same plane as the center seal processing part in a direction perpendicular to the sealing direction and at a constant interval. A fourth step of forming a corrugated heat-sealed portion so that, in the bottom portion of the wave-type sealing portion,
It is characterized by comprising a fifth step of cutting each.

In order to solve the above-mentioned problems, the method for manufacturing a plastic special bag according to a third aspect of the present invention is such that a flat surface facing the longitudinal direction is formed on a long tubular member, and the flat surface is formed. The first step of folding both sides of the inside inward to form a gusset surface having a valley inside, and each of the gusset surfaces thus formed is overlapped with the flat surface on both sides thereof, A second step of heat-sealing the side parts to form four heat-sealing side parts;
The third step of performing a geta seal for simultaneously forming two heat seal parts parallel to the heat seal side part on the opposing flat surfaces of the long member on which the heat seal side part is formed; The two heat-sealing portions formed by sealing and the heat-sealing side portions are in the direction perpendicular to the sealing direction and at regular intervals, and the wave crests are in the two heat-sealing portions and in the same plane as this. A fourth step of forming a corrugated heat seal portion so that the corrugated heat seal portions are formed on opposite sides of the corrugated heat seal portion, and between the two heat seal portions and the bottom portion of the corrugated seal portion. And a fifth step of cutting.

According to a fourth aspect of the present invention, there is provided a method for manufacturing a plastic special bag, wherein, in order to solve the above-mentioned problems, a flat surface facing the longitudinal direction is formed on a long tubular member,
Folding both sides of the flat surface inward, the first step of forming a gusset surface having a valley inside, and each of the gusset surface thus formed, by overlapping with the flat surface on both sides thereof. , Heat sealing parallel to the side portions at the same time on the flat surface between the both side portions and the both side portions to form four heat seal side portions, and at the same time, the both side portions on opposite flat surfaces. A second step of forming a heat seal part parallel to the heat seal part of the flat surface and a direction perpendicular to the sealing direction of the heat seal part of the flat surface and the side part of the heat seal, and the wave crests are the heat seal part. And a third step of forming a corrugated heat seal portion so as to be formed on opposite heat seal side portions in the same plane, and a heat seal formed on the opposite flat surface. In the bottom part of the wave seal unit as part, in which is characterized by comprising a fourth step of cutting, respectively.

According to a fifth aspect of the present invention, in order to solve the above-mentioned problems, the plastic special bag is manufactured by forming a flat surface on a long tubular member, the flat surfaces facing each other in the longitudinal direction.
A first step of forming a gusset surface having a fold inside the cylinder on one side portion of the both flat surfaces, the other side portion of the both flat surfaces, and the gusset surface thus formed on both sides thereof. A second step in which a certain flat surface is overlaid and heat-sealed to form three heat-sealing side portions, and a wave crest is formed in a direction perpendicular to the heat-sealing side portions at regular intervals. A fourth step of forming a corrugated heat seal portion so as to be formed on opposing heat seal side edges in the same plane, and a fifth step of cutting each at the bottom edge portion of the corrugated seal portion. It is characterized by consisting of.

In order to solve the above-mentioned problems, a method for manufacturing a plastic special bag according to a sixth aspect of the present invention is a corrugated heat in the method for manufacturing a plastic special bag according to any one of the first to fifth aspects. At the time of the sealing step, each of the heat-sealing portion and the heat-sealing side portion and the heat-sealing processing portion formed in the lengthwise direction is subjected to trapezoidal heat-sealing with these as the bases to form a drive-in portion, and thereafter. According to each of the above-mentioned claims 1 to 5, after the final step, the upper part of the gusset portion is pulled out to the outside with a heat-sealing side portion on both sides thereof as a boundary, and poured. A mouth is formed and the upper portion of the spout is heat-sealed.

In order to solve the above-mentioned problems, a method of manufacturing a plastic special bag according to a seventh aspect is a long shape in the method of manufacturing a plastic special bag according to any one of the first to second aspects. For the flat member of the above, a multilayer laminated base material comprising an inner surface base material and an outer surface base material is used, and the inner surface base material such as linear low density polyethylene or ethylene vinyl acetate polymer is easily heat-sealed to each other. It is made of a low melting point base material, and the outer surface base material is made of a base material made of Al foil, nylon, paper or the like, and the inner surface base material becomes the inner side when center-sealing in the first step. It is characterized by being configured as follows.

In order to solve the above-mentioned problems, the method for manufacturing a plastic special bag according to claim 8 is a long shape in the method for manufacturing a plastic special bag according to any one of claims 3 to 5. For the tubular member, a multilayer blown film composed of an inner surface substrate and an outer surface substrate is used, and the same material such as linear low density polyethylene or ethylene vinyl acetate polymer is easily heat-sealed to the inner surface substrate. A low melting point base material, the outer surface base material is composed of a base material such as nylon, polyethylene terephthalate, polybutylene terephthalate, etc., and the inner surface base material is the inner side. It is characterized by that.

[0016]

According to the present invention, the plastic special bag is formed from a single continuous flat member or a continuous tubular member as in the above method, so that the plastic special bag is manufactured from a conventional multi-member. It does not require the work of aligning the members before heat-sealing between each member, thus avoiding the occurrence of defective products due to the displacement of the members, and the displacement of the alignment between the members causes At the same time, it is possible to solve the problem of misalignment of printed decorative designs.

Further, in the method of the present invention, the starting base material is formed of a single continuous member or a continuous tubular member instead of the conventional multi-member.
Other than omitting the steps such as the work of aligning the members in the conventional production line, it is possible to use the conventional production line as it is, and manufacture plastic special bags with good production efficiency without major changes in the production line. It is possible to

Further, in the method of manufacturing the plastic special bag in the method of the present invention, the flat member is an inner surface base material made of a low melting point base material capable of heat-sealing the flat materials,
Using a multilayer laminated base material consisting of an outer surface base material that is difficult to heat-bond the same materials, even in a tubular member, if the inner surface base material is the same material, the member that is easily heat-sealed and the outer surface base material are the same. By using a multi-layer blown film made of a material that is difficult to heat-bond between the materials, both the flat member and the tubular member can be heat-sealed at the time of the heat-sealing with the inner surface base material facing each other. Is
Since the bag is bonded and formed by utilizing the fusion between the inner surface base materials, it is possible to manufacture a bag that does not require an adhesive or the like.

[0019]

EXAMPLES Examples of the method for producing a plastic special bag according to the present invention will be described below. As the flat member and the tubular member used when manufacturing the plastic special bag of the following examples, those having the following configurations were used. For the flat member, a base material such as Al foil, nylon, paper, etc., which is difficult to be heat-fused by the same material such as a composite material or a composite material, is used for the outer surface substrate, and a linear low density material is used for the inner surface substrate. For the same material such as polyethylene or ethylene vinyl acetate copolymer, a base material that is easily heat-sealed is used, and a multilayer laminated base material in which these are in a laminated state is used. A base material such as nylon, polyethylene terephthalate, or polybutylene terephthalate that is difficult to heat-bond with each other is used as the outer surface base material, and a linear low-density polyethylene or ethylene pinyl acetate copolymer is used as the inner surface base material. A base material that is easily heat-sealed between the same materials is used, and a multilayer inflation film in which these are laminated is used.

(Embodiment 1) In Embodiment 1, FIG.
As shown in (a), a decorative design print 2 is applied to the outer surface base material 1a of the pair of long flat members 1 made of the above base material so that the printed surface becomes the front surface and the inner surface base material. 1
Center seal so that b is on the inside. Then, as shown in FIG. 1 (b), the center seal surface on which the center seal portion 3a is formed and the surfaces facing the center seal surface are flat surfaces 3 and 4, and both sides of the flat surfaces 3 and 4 are the inner side thereof. To form gusset surfaces 5 and 6 having valley folds 5a and 6a inside.

Then, as shown in FIG. 1C, the gusset surfaces 5 and 6 formed between the flat surfaces 3 and 4 are overlapped with the flat surfaces 3, 4, 3 and 4 on both sides thereof. Together, both sides are heat-sealed to form four heat-sealing side portions 7, 7, 8, 8. Then, Fig. 1
As shown in (d), the center seal portion 3a is sandwiched, and the opposite flat surfaces are sandwiched by using geta seal members G, G so that parallel heat seal portions 9a, 9b are formed on both sides thereof. The clog sticker is applied so as to be removed. Thereafter, as shown in FIG. 1 (e), the two heat-sealing portions 9a, 9b and the heat-sealing side portions 7, 7, 8, 8 formed by the geta seal are arranged in the sealing direction with respect to these. The corrugated heat seal is formed such that wave peaks are formed in the two heat seal portions 9a and 9b and the heat seal side portions 7 and 8 that are in the same plane as the heat seal portions 9a and 9b in the vertical direction at regular intervals. The part 10 ... Is formed.

Then, as shown in FIG. 1 (f), straight lines α, α'provided on the two heat seal portions 9a, 9b.
And the bottom portion β of the corrugated heat seal portion 10 ... Is cut and the center seal portion 3a is removed, and then the end portion of the corrugated heat seal portion 10 ... , D, C ', and D', the plastic special bag 11 of the present Example 1 as shown in FIG. 1 (g) is completed.

Therefore, the plastic special bag 11 manufactured by the method of the first embodiment having the above-described structure is different from the conventional plastic special bag manufactured by the conventional multi-member in that the space between the members at the time of heat sealing is increased. It is possible to avoid the occurrence of defective products and the like due to the positional deviation of the above, and to prevent the printing deviation of the decorative design printed on the surface of the member caused by the positional deviation between the respective members. And
Conventionally, it has been shunned that the surface of the conventional plastic special bag is subjected to a complicated decorative design in consideration of such design misalignment. It is possible to manufacture without worrying about the problem of print misalignment of the surface design, and it is possible to apply a complicated and versatile design to the surface of a plastic special bag for multiple purposes.

As shown in FIG. 1 (g), the plastic special bag 11 of the first embodiment manufactured by the above-described method has two long flat members 12a having a chevron shape at the bottom. , 12b and the flat member 1
A gusset member 13 having a shape similar to that of 2a, 12b and having a valley fold at the bottom mountain-shaped position of the shape as a boundary,
The side edges 14, 15, 16 and the bottom edges 17, 1 respectively.
8 and 19 are heat-sealed, and the plastic special bag 11 according to the first embodiment having the above configuration
When the contents are stored in and sealed and used, it has a triangular prism shape as shown in FIG. 2, and is self-supporting regardless of which surface is the bottom surface.

Therefore, the plastic special bag 11 manufactured by the above-described method of the present invention, in which the product (contents) is sealed, can be stably stored regardless of which side is the bottom. Therefore, when transporting and storing multiple stacks, it is possible to efficiently transport and store even in a limited space, and even when these are displayed in stores, they can be placed vertically and horizontally in a stable manner. Therefore, various display methods can be adopted, and the purchasing effect of products can be improved.

(Embodiment 2) In the present embodiment 2, FIG.
As shown in (a), a decorative design print 41 is applied to the outer surface base material 40a of the pair of long flat members 40 made of the above base material so that the printed surface becomes the front surface and the inner surface base material. A center seal 43a is provided so that 40b is on the inside. Then, as shown in FIG. 3B, the flat surfaces 44 and 45 facing each other are formed so that the center seal portion 43 becomes one side. Further, a gusset surface 4 having a side fold newly formed by the both flat surfaces 44 and 45 is folded inward and a valley fold 46a is formed inside.
6 is formed.

Then, the gusset surface 46 formed as described above and the flat surfaces 44 and 45 on the sides thereof are overlapped with each other to heat-seal both side portions to form heat-sealed side portions 48 and 48. The center seal portion 43 forming the one side portion is heat-sealed to form the center seal processing portion 47. Subsequently, in a direction perpendicular to the sealing direction of the center seal processing part 47 and the heat seal side parts 49, 49, at a constant interval,
The corrugated heat seal portions 49 ... Are formed so that wave peaks are formed on the heat toll processing portion 47 and the heat seal side portion 48 that is in the same plane as the heat mountain processing portion 47. Then, each of the bottom portions ε ... Of the corrugated seal portions 49 ... Formed as described above is cut, and the end portions of the corrugated heat seal portions 49 ... , H,
By cutting along G ′ and H ′ as shown in FIG. 3E, the plastic special bag 50 of the second embodiment as shown in FIG. 4F is completed.

As described above, the plastic manufacturing bag 50 of the second embodiment manufactured by the method as described above also has the same shape as that of the first embodiment, and the second embodiment is different from the first embodiment. Are opposed flat surfaces 44, 45
In, there is no long-side heat seal portion to divide it into two, therefore, by not forming the heat seal portion as described above, there is no step of cutting this portion,
Although the manufacturing efficiency thereof is better than that of the first embodiment, it is inevitable that the second embodiment is applied to a manufacturing line similar to that of the first embodiment and a flat surface having a constant width is used. The special plastic bag that will be completed will be large.

(Embodiment 3) In Embodiment 3, FIG.
As shown in (a), the inner surface base material 20b made of the above base material.
Is the inner surface, and the outer surface base material 20a forms the outer surface. The outer surface base material 20a of the cylindrical member 20 is subjected to the decorative design printing 21. As shown in FIG. Flat surfaces 22 and 23 facing each other in the longitudinal direction are formed, and both sides of the flat surfaces 22 and 23 are folded inward to form gusset surfaces 24 and 25 having valley folds 24a and 25a inside. Then, as shown in FIG. 4C, each of the gusset surfaces 24 and 25 formed as described above is overlapped with the flat surfaces 23 and 24 on both sides thereof to heat-seal the both side portions, Four heat seal side portions 26, 26, 27, 27 are formed. Subsequently, in order to form two heat seals 28a, 28b parallel to the heat seal side portions 26, 26, 27, 27 on the opposed flat surfaces 22, 23, geta seal members G, G are formed. Using the opposed flat surfaces 22, 2
Put the clogs on the clogs 3 and seal them.

After that, as shown in FIG.
Heat seal portions 28a, 28b and heat seal side portions 26, 26, 27, 27 in the direction perpendicular to the sealing direction and at regular intervals, the wave crests have the two heat seal portions 28a, 28b. After the corrugated heat seal portions 29 ... Are formed so as to be formed on the heat seal side portions 26 and 27 in the same plane as these, as shown in FIG. 4 (f), the heat seal portion 28a is formed. , 28b and the bottom portion γ of the corrugated seal portion are cut off, and the end portions of the corrugated heat seal portion 29 ... , F ′, the plastic special bag 30 of the third embodiment as shown in FIG. 4 (g) is completed.

The special plastic bag 30 of the third embodiment manufactured by the above-mentioned method has the same shape as that of the first embodiment. In the manufacturing method of the third embodiment, Unlike Example 1 and Example 2 described above, Example 1 has a starting base material which is a single long flat member 1, whereas Example 3 has Example 3.
However, there is a difference in using the continuous tubular member 20. That is, due to the difference as described above, in the first embodiment, the center seal that makes the elongated flat member 1 cylindrical is necessary, and further, the final cut is performed to remove the center seal portion 3a. In the process, it is necessary to cut two straight lines α, α that sandwich the center seal portion 3a, but in the third embodiment, such a process is not necessary. Therefore, in the third embodiment, the same effect as in the first embodiment can be obtained, and the special plastic bag having the same shape can be manufactured by a simpler process than the first embodiment. is there.

In the third embodiment, the gusset surfaces 24 and 25 and the flat surfaces 22 and 23 are overlapped with each other and both sides thereof are heat-sealed to form heat-sealing side portions 26, 26 and 27. , 27, and then, by using a clog seal on the opposite flat surfaces 22 and 23,
The parallel heat-sealing portions 28a and 28b of the book are formed, but instead of the two heat-sealing portions 28a and 28b,
A single linear heat seal may be performed, and this can be performed at the same time when the heat seal side portions 26, 26, 27, 27 are formed. According to the method, it is possible to manufacture a special plastic bag having more efficient manufacturing efficiency.

(Embodiment 4) In Embodiment 4, FIG.
As shown in (a), a decorative design printing 62 is applied to the outer surface base material 60a of the tubular member 60 in which the inner surface base material 60b of the base material forms the inner side and the outer surface base material 60a forms the outer side, and FIG.
As shown in (b), flat surfaces 63 and 64 facing each other in the longitudinal direction are formed, one side of the flat surfaces 63 and 64 is folded inward, and a gusset surface having a valley fold 65a inside is formed. 65 is formed.

Then, the gusset surface 65 formed as described above and the side portions of the flat surfaces 63 and 64 on both sides thereof are overlapped and heat-sealed as shown in FIG. At the same time as forming the seal side portions 67, 67, the one side portion is also heat-sealed to form the heat seal side portion 66. Then, in a direction perpendicular to the sealing direction of the heat-sealing side portions 66, 67, 67,
The heat-sealing side portion 66 and the heat-sealing side portion 6 in the same plane as the heat-sealing side portion 66 at regular intervals.
7 is formed, as shown in FIG. 5D, the corrugated heat seal portions 68 ... Then, at the bottom portion η of the corrugated seal portions 68 ..., Each is cut as shown in FIG. 5 (e), and the end portions of the corrugated heat seal portions 68 ... I, J, I ', J'
By performing a cutting process along the line, a special plastic bag 70 as shown in FIG.

The plastic special bag 70 manufactured as described above has the same shape as that of the first to third embodiments, and the fourth embodiment is different from the first and third embodiments. In the same manner as in the second embodiment described above, the opposing flat surfaces 63 and 64 are not provided with the heat seal portion in the longitudinal direction that divides the flat surfaces 63 and 64. Therefore, by not forming the heat seal portion as described above, There is no cutting step for this portion, and the manufacturing efficiency is better than that of the first embodiment, as in the second embodiment.
When this Example 4 is applied to a manufacturing line similar to that of Example 1 above, and a flat surface having a constant width is used,
The special plastic bag that will be completed will inevitably be large. However, in the second embodiment, one flat member 40 is used.
Center seal 43a, and after making this into a cylindrical shape,
Flat surface 4 with the center seal portion 43 as one side
4 and 45 are formed, but in the case of the present Example 4, since the member 60 which is already continuous and has a cylindrical shape is used as the starting base material, the center sealing step as in the above Example 2 is performed. It is possible to manufacture a special plastic bag more efficiently than in the second embodiment, which is not necessary.

In Examples 1 to 4 described above, since the starting base material is a single flat member or a cylindrical continuous member, the flat surface and the gusset surface are processed or heat-sealed. It is possible to completely avoid the positional deviation between the respective members, unlike the conventional method for manufacturing a plastic bag by using multiple members, without requiring alignment. Therefore, by avoiding the positional displacement of the flat surface or the gusset surface, it is possible to avoid the image displacement or the character displacement of the decorative design or the like printed on the flat surface or the gusset surface. Therefore, the plastic special bag with the above configuration can be printed on the surface with more complicated and various decorative designs, and it is possible to provide a plastic special bag that can be used for multiple purposes according to the needs of the times. It is what

Then, as described above, the method for manufacturing the plastic special bag described in Examples 1 to 4 is as follows.
All of them can be manufactured on the same manufacturing line by removing a part of the conventional manufacturing line, and the special plastic bag with good manufacturing efficiency as described above can be used without significantly changing the conventional manufacturing line. Can be manufactured.

Further, application examples of the above embodiment will be described below with reference to the drawings. The plastic special bag of the present invention may be used while the product of the contents is contained in the plastic special bag of the present invention, but the stored product is often used after being transferred to another container. . Therefore, especially when the product of the content is a fine powder or liquid, a spout for transferring the product of the content is formed from the plastic special bag in this embodiment to another container. It is convenient. Therefore, in this application example, a method for manufacturing a plastic special bag having a spout for the contents will be described in the above-described embodiment.

(Application Example) The plastic special bag of this application example is prepared in the same manner as in the above-mentioned Example 1 up to the step shown in FIG. As shown in FIG. 6 in the step shown in FIG. 6E, at the same time as forming the corrugated heat-sealing parts 10 ... Trapezoidal drive-in parts 81, 82, 83, 8
4 is heat-sealed. The subsequent cutting step is the same as the step of FIG. 1 (f) of the first embodiment. Thereafter, as shown in FIG. 7, heat-sealing 85 the upper end of the spout 86a formed by folding the upper open end of the gusset surface 5, 6 outward with the side edges of the gusset surface 5, 6 as boundaries. Is completed by. In addition,
The corner treatment as shown in FIG. 1 (f) may be performed before the cutting of each heat seal portion shown in FIG.

Accordingly, the plastic special bag 90 of the present application example having the above-mentioned structure has the same effect as that of the above-mentioned embodiment, and when the product of the stored contents is transferred to another container for use. When pouring out, it is possible to easily transfer or pour out the contents by cutting the upper end of the heat-sealed pouring port 85, and spilling the contents to the outside or spilling the contents. It is possible to prevent unnecessary waste and improve work efficiency.

Although the modified example of the first embodiment has been shown in the above-mentioned application example, in any of the second to fourth embodiments, the heat of the drive-in portion is heated when the corrugated heat seal portion is formed. By performing the sealing at the same time, it is possible to manufacture a special plastic bag having the same shape as the application example made by the modification of the first embodiment.

[0042]

As described above, according to the present invention, the plastic special bag is formed from a single continuous flat member or a continuous tubular member as in the above method, so that the plastic special bag is manufactured from conventional multi-members. As described above, it is not necessary to perform the member alignment work before the heat sealing between the members, so that the occurrence of defective products due to the position shift between the members can be avoided, and the member shift due to the position shift between the members can be avoided. At the same time, it is possible to solve the problem of print misalignment of the decorative design printed on the surface.

Further, in the method of the present invention, the starting base material is formed of a single continuous member or a continuous tubular member instead of the conventional multi-member.
Other than omitting the steps such as the work of aligning the members in the conventional production line, it is possible to use the conventional production line as it is, and manufacture plastic special bags with good production efficiency without major changes in the production line. It is possible to

Further, in the plastic special bag in the method of the present invention, it is difficult to heat-bond the flat member to the inner surface base material made of a low melting point base material capable of heat-sealing the same materials. Using a multi-layer laminated base material consisting of a simple outer surface base material, even in a tubular member, it is difficult to heat bond the inner surface base material with the same material and the outer surface base material with the same material. By using a multilayer inflation film composed of a member, both in the flat member and the tubular member, at the time of heat sealing, the inner surface base material is heat-sealed in a state of being opposed, Since the bag is adhesively formed by using fusion, the bag can be manufactured without using an adhesive or the like.

As described above, according to the method of the present invention, it is possible to surely and efficiently manufacture a special bag having a designed design, and by expanding the degree of freedom in decorating the outer bag, the needs of the times can be met. We can manufacture a variety of special plastic bags that suit your needs.

[Brief description of drawings]

FIG. 1 is a diagram for explaining a method for manufacturing a plastic special bag of Example 1 of the present invention and an application example thereof.

FIG. 2 is a diagram showing a state in which contents are stored in a special plastic bag according to an embodiment of the present invention.

FIG. 3 is a diagram for explaining a method of manufacturing a special plastic bag according to a second embodiment of the present invention.

FIG. 4 is a diagram for explaining a method of manufacturing a special plastic bag according to a third embodiment of the present invention.

FIG. 5 is a diagram for explaining a method of manufacturing a plastic special bag according to a fourth embodiment of the present invention.

FIG. 6 is a diagram for explaining one step of forming a heat seal on the drive-in portion at the time of manufacturing the plastic special bag of the application example of the present invention.

FIG. 7 is a diagram for explaining a final step of manufacturing a special plastic bag according to an application example of the present invention.

FIG. 8 is a perspective view showing a conventional gusset four-way seal pack.

FIG. 9 is a perspective view showing a conventional standing pouch type special bag.

FIG. 10 is a diagram for explaining a manufacturing process of a conventional gusset four-way seal pack.

FIG. 11 is a diagram for explaining a manufacturing process of a conventional standing pouch-type special bag.

[Explanation of symbols]

1, 40, flat members 1a, 20a, 40a, 60a, outer surface base materials 1b, 20b, 40b, 60b, inner surface base materials 2, 21, 42, 62, decorative design printing 3, 4, 22, 23, 44, 45, 63, 64, flat surface 3a, 43a, center seal portion 5, 6, 24, 25, 46, 65, gusset surface 5a, 6a, 24a, 24b, 46a, 65a, valley fold 7, 8, 26, 27 , 48, 67, heat seal side parts 47, 66, center seal processing parts 9a, 9b, 28a, 28b, heat seal parts 10, 29, 49, 68, corrugated heat seal parts 20, 60, tubular member 11 , 30, 50, 70, special plastic bag 81, 82, 83, 84, drive-in section 90, special plastic bag G with spout G, geta seal member

Claims (8)

[Claims] 1. A first step of center-sealing one long flat member in the lengthwise direction to form a tubular shape, a center seal surface having the center seal portion and a surface facing the center seal surface. As a flat surface, and the second step of forming both sides of the flat surface by folding both sides inside thereof to form a gusset surface, and overlapping each of the gusset surfaces thus formed with the flat surfaces on both sides thereof, and the both sides thereof. The third step of heat-sealing the parts to form four sides of the heat-sealing side, and two parallel pieces on both sides of the center seal part with the long member having the heat-sealing side parts formed therebetween. Vertical step with respect to the sealing direction of the two heat seal parts formed by the geta seal and the heat seal side edge part A fifth step of forming a corrugated heat seal portion so that wave crests are formed on the two heat seal portions and on the opposite heat seal side edges in the same plane as the first and second heat seal portions in the same direction. A method of manufacturing a plastic special bag, comprising: a step, and a sixth step of cutting each of the two heat seal portions and the bottom portion of the corrugated heat seal portion. 2. A first step of center-sealing one elongated flat member in the longitudinal direction to form a tubular shape, and the center-seal portion as one side, on the opposite surface of the center-seal portion. The second step of forming a gusset surface having a fold inward, the center seal portion, and the gusset surface thus formed is heat-sealed by superimposing both side portions of flat surfaces on both sides thereof, and heat-sealing. Section and two heat-sealing side portions are formed, and a wave peak is formed in a direction perpendicular to the sealing direction of the center-sealing processing portion and the heat-sealing side portion at a constant interval. A fourth step of forming the corrugated heat seal portion so as to be formed on the center seal processing portion and the opposing heat seal side portions on the same plane as the center seal processing portion, and on the bottom portion of the corrugated seal portion. The method for producing a special plastic bag is characterized by comprising a fifth step of cutting each of them. 3. A long tubular member is formed with flat surfaces facing each other in the longitudinal direction, and both side portions of the flat surface are folded inward to form a gusset surface having a valley inside. And the second step of superposing each of the gusset surfaces thus formed with the flat surfaces on both sides thereof and heat-sealing both side portions thereof to form four heat-sealing side portions. And a third step of performing a geta seal for simultaneously forming two heat-sealing portions parallel to the heat-sealing side portions on opposing flat surfaces of the long member on which the heat-sealing side portions are formed, The two heat-sealed portions formed by the geta seal and the two heat-sealed portions having the wave peaks are the same as the heat-sealed portions of the heat-sealing side portions in a direction perpendicular to the sealing direction and at a predetermined interval. In the plane A fourth step of forming a corrugated heat seal portion so that the corrugated heat seal portions are formed on opposite sides of the corrugated heat seal portion, and between the two heat seal portions and the bottom portion of the corrugated seal portion. A method for producing a special plastic bag, which comprises a fifth step of cutting 4. A gusset surface having a valley portion inside is formed by forming flat surfaces facing each other in the lengthwise direction on a long tubular member and folding both sides of the flat surface inward. Each of the first step and each of the gusset surfaces thus formed are overlapped with the flat surfaces on both sides thereof, and the flat surface between the both side portions and the both side portions is heated in parallel with the side portions. A second step of simultaneously performing sealing to form four heat-sealing side portions and simultaneously forming heat-sealing portions parallel to the both side portions on opposing flat surfaces, and the heat-sealing portion and heat of the flat surface. The corrugations are formed so that wave peaks are formed on the heat-sealing portion and on the opposing heat-sealing side portions on the same plane as the heat-sealing portion in a direction perpendicular to the sealing direction and at regular intervals. Heat Made of a plastic material, which comprises a third step of forming a seal portion, and a fourth step of cutting each of the heat seal portion formed on the facing flat surface and the bottom portion of the corrugated seal portion. Special bag manufacturing method. 5. A flat surface facing the lengthwise direction is formed on a long tubular member, and a gusset surface having a fold inside the cylinder is formed on one side of both flat surfaces. One step and the other side portions of the both flat surfaces and the gusset surface thus formed are heat-sealed by superimposing the flat surfaces on both sides thereof to form three heat-sealing side portions. In the second step, the corrugated heat-sealing portion is formed so that wave peaks are formed on the opposing heat-sealing side portions in the same plane in a direction perpendicular to the heat-sealing side portion and at regular intervals. A fourth step of forming
A method of manufacturing a special plastic bag, comprising a fifth step of cutting each of the bottom portions of the corrugated seal portion. 6. The heat-sealing portion and the heat-sealing side portion formed in the lengthwise direction during the corrugated heat-sealing step in the method of manufacturing a plastic special bag according to any one of claims 1 to 5. Also, in each of the heat-sealing processing portions, trapezoidal heat-sealing with these as bases is performed to form a drive-in portion, and subsequent steps are performed according to each of claims 1 to 5, and after the final step, A plastic special feature characterized in that the upper part of the gusset part is drawn out outward in a mountain shape with the heat seal side parts on both sides as boundaries to form a spout and the upper part of the spout is heat-sealed. Bag manufacturing method. 7. A multilayer laminated base material comprising an inner base material and an outer surface base material is used for the long flat member in the method of manufacturing a plastic special bag according to claim 1. The inner surface base material is composed of a low melting point base material such as linear low-density polyethylene or ethylene vinyl acetate polymer, which is easily melt-bonded to each other, and the outer surface base material is Al.
It consists of a base material made of foil, nylon, paper, etc.
A method of manufacturing a plastic special bag, characterized in that the inner surface base material is arranged inside when center-sealing in the first step. 8. A multilayer inflation film comprising an inner surface base material and an outer surface base material is used for the long tubular member in the method of manufacturing a plastic special bag according to any one of claims 3 to 5. The inner surface base material is made of a low melting point base material such as linear low-density polyethylene or ethylene vinyl acetate polymer which is easily heat-sealed, and the outer surface base material is nylon or polyethylene terephthalate. ,
A method for producing a plastic special bag, characterized in that it is composed of a base material made of polybutylene terephthalate or the like, and the inner surface base material is arranged inside.