JP3100749B2 - Gusset bag with zipper and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gusset bag, and more particularly to a gusset bag with a zipper whose opening is openable and closable for taking out contents.

[0002]

2. Description of the Related Art Conventionally, among flat bag containers having opposing flat surfaces, those which heat seal around four sides of a bag (four-side sealed bags) are made of a film material which is a material of the flat bag container. Processing can be performed by making the transport direction and the flow direction of the zipper part the same, and from the viewpoint of improving productivity, containers with zippers have been conventionally manufactured by this method. Recently, even if it is something other than a four-sided seal bag, it has been devised to attach a zipper, and apart from the bag body part of the bag,
There has been proposed a container made by a method in which a cap-sack-shaped member provided with a zipper portion is previously applied as if a cap were applied.

[0003] Gusset bags having a so-called "town" on both sides of the bag have a wide range of uses, especially because of their excellent self-sustainability and excellent capacity, and we would like them to be zippered. There are many requests to that effect.

[0004]

However, the gusset bag has a problem that it is difficult to attach the zipper, especially since the gusset has a folded portion. Another problem is that the processing is complicated because the flow direction of the film in the bag and the direction of the zipper are different.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a gusseted bag with a zipper in which a zipper member can be easily and reliably mounted, and a method of manufacturing the same.

[0006]

SUMMARY OF THE INVENTION In order to solve such a problem, the present invention is directed to a bag which is folded inward into a pair of opposing flat portions constituting the front and rear sides of a bag. With a zipper including a cylindrical bag main body having two side surfaces formed so as to have a folding line, and a zipper attached to an inner surface near one end of the bag main body on the side to be the mouth of the bag. A gusset bag, wherein the bag main body is positioned at two corners that are both ends of one of the plane portions of the fusion seal surface at the mouth end of the bag main body and the four corners of the bag main body. ,Each,
A fusing seal surface formed to cut inwardly to a predetermined distance and to seal the once cut incision, wherein the zipper has two end portions of the incision in the bag body. The straight line connecting is used as a base line so as to be once mounted in a folded door-like open surface.
Also, a pair of opposing planes that constitute the front and back sides of the bag
Part and a fold line that is folded inward in a fold
Cylindrical bag body having two side surfaces formed as described above
And an inner surface near one end on the side of the bag body portion which is to be the mouth of the bag
Gusset bag with zipper with zipper attached to
And one zipper member constituting the zipper is
On one inner surface of the flat portion, the other zipper member is attached to the flat portion.
Are attached to the other inner surface of the
The side with the folded line is folded into the one side.
One end of the flat portion is formed by both ends in the longitudinal direction of the lid member.
It was configured to be pressed against the surface and fixed.

Further, according to the method of manufacturing a gusseted bag with a zipper of the present invention, two corners, which are both ends of one of the plane portions, of the four corners of the bag body for opening the mouth of the bag body. From each, a cut is made inward to a predetermined distance, and a straight line connecting the two end portions of the cut is used as a base line,
Two bendable door-shaped open surfaces are formed, and the open surfaces are bent along the base line so that the inner surface of the open surface is exposed, and male members of a zipper are respectively formed on the inner surfaces of the open surfaces. And the female member is fixed so as to be in a mirror image relationship with the base line, and the two surfaces are closed and closed so that the male member and female member of the zipper are fitted. The vicinity and the upper end portion of the container were fused so that the upper portion of the container was tightly sealed.

[0008]

According to the present invention, the bag body is formed once by a generally used method, and both ends of one of the four corners of the bag body are opened to open the mouth of the bag body. From each of the two corner positions, a notch is cut inward to a predetermined distance to form two bendable door-shaped open surfaces, and on this open surface, the male member of the zipper and Since the female member is fixed so as to be in a mirror image relationship with the center line of the mouth of the bag, the mounting of the zipper member can be performed easily and reliably.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A gusseted bag 1 with a zipper according to the present invention has a pair of opposed flat portions 11 and 13 forming the front and rear sides of the bag.
And a cylindrical bag body 10 having two side surfaces 21 and 21 formed so as to have fold lines 23 and 23 folded inward in a fold shape, and a bag of the bag body 10. A zipper 30 attached to the inner surface near one end on the side to be the mouth Q. The zipper 30 is for opening and closing the bag mouth freely.

The bag body 10 seals the entire end 28a of the mouth Q of the bag body and the side faces 28b, 28b from the mouth end to a position further inward than the zipper fixing position S. Seal surface 28 (the surface indicated by hatching) formed as described above.

The zipper 30 is once mounted in a folded door-like open surface with a straight line connecting the two ends of the notch in the bag body as a base line. This state will be further clarified by referring to the manufacturing method described later.

The zipper 30 has a band shape as shown in FIG. 6, and is formed by a combination of a male member 31 and a female member 35 to be fitted. The male member 31 is a substrate 32
And a convex band 33 protruding at the center of one side of the substrate 32, and the other flat surface 32a of the substrate 32 (the convex band 3).
3 opposite to the forming surface) is bonded to the inner surface of the bag body. On the other hand, the female member 35 includes a substrate 36 and a concave band 38 formed at the center of one plane of the substrate 36, and the other flat surface 36 a of the substrate 36 (the side opposite to the concave band 38 forming surface) is formed. It is adapted to be adhered to the other inner surface of the opposing bag body.

The gusseted bag 1 with a zipper of the present invention is formed through the following steps. First, as shown in FIG. 1, a pair of opposed flat portions 1 constituting the front side and the rear side of the bag.
1, 13 and a fold line 2 folded inward in a fold shape
Two side surfaces 21 and 2 formed to include
1 is prepared.

Next, as shown in FIG. 2, of the four corners A, B, C, and D of the mouth end of the bag body 10, the positions of the two corners which are both ends of any one of the plane portions 11 are shown. (For example,
C, D), a cut is made inward to a predetermined distance from each, and a door-like openable surface 11a, 13a that can be bent with a straight line L connecting the ends of the two cuts as a base line.
(Including a part of the folded side). That is,
Cuts 15, 15 are made inward from the upper end of the joint between the flat portion 11 and the side surfaces 21, 21 of the bag body 10 to a predetermined distance, respectively. These cuts have substantially the same depth.

Next, as shown in FIG.
1a and 13a are bent along the base line L so that the inner surfaces of the open surfaces 11a and 13a are exposed. At this time, the strip-shaped male member 31 and the female member 35 constituting the zipper 30 are transported to positions above the open surfaces 11a and 13a, respectively. As described above, since the transport direction (E) of the bag body 10 and the direction (F) of the zipper 30 are in the same direction, the processing is facilitated, which is suitable for mechanization.

Next, as shown in FIG. 4, the male member 31 and the female member 35 of the zipper 30 are mounted on the base surfaces L on the open surfaces 11a and 13a which are bent so that the inner surfaces are exposed.
Are fixed so as to be in a mirror image relationship with respect to. Usually, they are arranged so as to be parallel along the base line L. in this case,
The fixing of the zipper members 31 and 35 is generally performed by a heat sealing method.

Next, as shown in FIG.
The two surfaces 11a and 13a which have been opened are once fitted and closed so that the male member 31 and the female member 35 are fitted to each other.
8b, 28b and the upper end 28a are fused to tightly seal the upper part 28 of the container (the sealing surface is indicated by oblique lines). In this manner, the gusseted bag with the zipper of the present invention is formed, and the contents to be put into the bag are usually filled from the bottom of the bag in an open state, and then the bottom is fusion-sealed.

In the present invention, the case where the contents are finally charged from the bottom of the bag has been described as an example, but the bottom is sealed from the beginning and finally the contents are charged from the zipper. Alternatively, the zipper may be closed and finally the upper end 28a may be sealed. Further, in the present invention, the male member 31 and the female member 35 of the zipper 30 can be attached to the inner surface of the bag body 10 while being fitted in advance.

[0019]

According to the present invention, the bag body is formed once by a commonly used method, and one of the four corners of the bag body is opened to open the mouth of the bag body. From each of the two corners, which are both ends, a notch is cut inward to a predetermined distance to form two foldable door-shaped open surfaces, and a male zipper is formed on each of the open surfaces. Since the mold member and the female member are attached, the attachment of the zipper member can be performed easily and reliably.

[Brief description of the drawings]

FIG. 1 is a schematic view showing one step of a manufacturing process of a gusseted bag with a zipper of the present invention.

FIG. 2 is a schematic view showing one step of a process of manufacturing a gusseted bag with a zipper of the present invention.

FIG. 3 is a schematic view showing one step of a manufacturing process of the gusseted bag with a zipper of the present invention.

FIG. 4 is a schematic view showing one step of a process of manufacturing a gusseted bag with a zipper of the present invention.

FIG. 5 is a schematic perspective view showing one step of a manufacturing process of the gusseted bag with a zipper of the present invention, and is a final form view of the gusseted bag with a zipper.

FIG. 6 is a schematic perspective view illustrating the configuration of a zipper.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Gusset bag with a zipper 10 ... Bag main body part 11, 13 ... Plane part 21, 21 ... Side surface 23, 23 ... Folding line 30 ... Zipper

Claims (3)

(57) [Claims] 1. A cylindrical shape having a pair of opposed flat portions forming the front side and the rear side of a bag, and two side surfaces formed so as to have a folding line folded inward in a fold shape. A gusseted bag with a zipper, comprising: a bag body portion; and a zipper attached to an inner surface near one end of the bag body portion on the side to be a mouth portion of the bag, wherein the bag body portion has a mouth portion of the bag body portion. Of the fusion seal surface at the end and the four corners of the bag body, two cuts are made inward from the two corners, which are both ends of one of the flat portions, to a predetermined distance inward, respectively. And a fusible sealing surface formed so as to seal the incised portion, wherein the zipper has a door-like shape that is once folded, with a straight line connecting two end portions of the cut of the bag body portion as a base line. A gusseted bag with a zipper, which is mounted in an opening surface. 2. A pair of opposed sides forming a front side and a rear side of a bag.
The pair of flat parts and the fold line folded inward in a fold
Tubular bag having two sides formed to comprise
A body portion, instrumentation to the inner surface of one end near the side of the mouth of the bag of the bag body portion
A gusseted bag with a zipper
The one zipper member that constitutes the zipper has a flat surface portion.
On one inner surface, the other zipper member is
Said side faces each having a fold line which is attached to the inner face and which is folded inward in a fold form
However, due to the longitudinal ends of the one zipper member,
Make sure that it is pressed against one inner surface of the
A gusseted bag with a zipper. 3. A cylindrical shape having a pair of opposed flat portions forming the front side and the rear side of the bag, and two side surfaces formed to have a folding line folded inward in a fold shape. A method for manufacturing a gusseted bag with a zipper, comprising: a bag body portion; and a zipper attached to an inner surface near one end of the bag body portion on a side to be a mouth portion of the bag, the method comprising: In order to open the part, of each of the four corners of the bag body, two incisions are made inwardly from the two corners, which are both ends of one of the plane parts, to a predetermined distance inward, respectively, and the two end parts of the incision are cut. The connecting straight line is used as a base line, and two bendable door-shaped open surfaces are formed. The open surface is formed along the base line on the inner surface of the open surface. Attach them so that they are mirror images of the base line. And the female member
A method for manufacturing a gusseted bag with a zipper, characterized in that the two faces are closed and closed, and thereafter, the vicinity of the cut portion and the upper end are fused and the upper part of the container is tightly sealed.