JP3209445B2 - Manufacturing method of flat bag with zipper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the manufacture of flat bags with zippers.
More particularly, the present invention relates to a method for manufacturing a flat bag whose mouth can be freely opened and closed by a zipper for taking out contents.

[0002]

2. Description of the Related Art Conventionally, among flat bags (containers) having opposing flat surfaces, those which heat seal around four sides of a bag (four-side sealed bags) are film materials which are materials of the flat bags. And the direction of flow of the zipper parts can be processed in the same direction. From the viewpoint of improving productivity,
Conventionally, flat bags with zippers have been manufactured by this method.
In recent years, it has been devised to attach a zipper to a material other than the four-side seal bag, and separately from the bag main body portion of the bag, a cap bag-like member having a zipper portion is previously covered with a hat. Containers made by such a method have been proposed.

[0003]

However, in a bag other than the four-side seal bag, for example, as shown in FIG. 7, a so-called center jointed bag, there is a step particularly at the center (back) seal 52. Therefore, there is a problem that even if the cap-bag-shaped member 60 provided with the zipper portion 65 is covered, the reliability is poor and difficult. In addition, 50
In the case of (1), the flow direction (C) of the film and the flow direction (D) of the zipper member are orthogonal to each other, and there is also a problem that the process of attaching the zipper member becomes complicated. The present invention has been made in view of the above circumstances, and an object of the present invention is to manufacture a flat bag with a zipper that allows easy and reliable mounting of a zipper member .
It is to provide a manufacturing method .

[0004]

[0005]

[Means for Solving the Problems] To solve such problems.
To this end, the present invention includes a cylindrical bag main body having a pair of opposed flat surfaces, and a zipper attached to an inner surface near one end of the bag main body that is to be the mouth of the bag. A method for manufacturing a flat bag with a zipper, wherein a cut is made inward from a position at two opposite ends of the mouth of the bag body to a predetermined distance, and a straight line connecting the ends of the cut is formed. As a base line, two foldable door-shaped open surfaces are formed, and the open surface is bent along the base line so that the inner surface of the open surface is exposed, and then the bag body is conveyed in its width direction. At the same time, the longitudinal direction of the zipper and the direction in which the baseline extends are made to coincide with each other, and the zipper is transported in the same direction as the bag main body, and the male member and the female member of the zipper are moved relative to the baseline. So that it is mirror-image The two open surfaces are closed so that the male member and the female member of the zipper are fitted to each other, and then the vicinity of the cut portion and the upper end are fused to form a container. The upper part was manufactured by tightly sealing.

[0006]

According to the present invention, once the method is used,
A bag body is formed, a cut is made inward along two fold lines from the mouth end of the bag body, the vicinity of the mouth of the bag body is opened, and a zipper is attached to the opened inner surface. As a result, the zipper member can be easily and reliably mounted.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 5, a flat bag 1 with a zipper according to the present invention has a cylindrical bag body 10 having a pair of opposed flat portions 11, 15; A zipper 20 is provided on the inner surface near one end on the side to be the mouth of the bag.
The zipper 20 is for freely opening and closing the mouth of the flat bag. Before the zipper is fixed, the tubular bag body 10 is basically formed by bonding the end surfaces of one sheet to each other with a joint, so that a step 37 is formed at the rear of the bag. ing.

The connecting surfaces of the flat portions 11 and 15 form fold lines 11 and 14 as shown in the figure. Further, a fusion seal surface 35 is formed at the mouth of the bag body 10 so as to seal the entire end of the mouth. Further, along the two folding lines 12 and 14 from the end of the mouth, the fusion sealing surfaces 31 and 33 are formed to a position further inside than the inside of the fixed zipper 20. This is performed in order to seal the incision once opened as described later.

The zipper 20 has a strip shape as shown in FIG. 6, and is formed by a combination of a male member 21 and a female member 25 to be fitted. The male member 21 is a substrate 22
And a convex band 23 protruding at the center of one side plane of the substrate 22, and the other flat surface 22 a of the substrate 22 (the convex band 2
3 opposite to the forming surface) is bonded to the inner surface of the flat bag. On the other hand, the female member 25 includes a substrate 26 and a concave band 28 formed at the center of one plane of the substrate 26, and the other flat surface 26 a of the substrate 26 (the side opposite to the surface on which the concave band 28 is formed) is formed. It is adapted to be adhered to the other inner surface of the opposing flat bag.

According to the manufacturing method of the present invention , the flat bag with zipper 1 is formed through the following steps. First, as shown in FIG. 1, a cylindrical bag main body 10 having a pair of flat portions 11 and 15 and formed in a palm shape is prepared. As shown in the figure, a seal fitting part 1 peculiar to the jointed palm is provided at the rear of the bag.
7 and is manufactured in advance by a commonly used method.

Next, as shown in FIG. 2, two opposing positions of the mouth end of the bag body 10, that is, a folding surface which is a continuous surface between the flat portions 11 and 15 of the bag body 10. The cuts 12a and 14a are cut inward from the upper ends of the lines 12 and 14 by a predetermined distance, respectively.
A straight line connecting the end portions of the a and a is defined as a base line L, and the door-shaped open surfaces 11a and 15a that can be bent from this portion are defined as two lines.
Form one.

Next, as shown in FIG.
1a and 15a are bent along the base line L so that the inner surfaces of the open surfaces 11a and 15a are exposed. At this time, the strip-shaped male member 21 and the female member 25 constituting the zipper 20 are transported to positions above the open surfaces 11a and 15a, respectively. As described above, since the transfer direction (A) of the bag body 10 and the direction (B) of the zipper 20 are in the same direction, the processing is facilitated, which is suitable for mechanization.

Next, as shown in FIG. 4, the male member 21 and the female member 25 of the zipper 20 are placed on the base lines L on the open surfaces 11a and 15a which are bent so that the inner surfaces are exposed.
Is fixed so as to be in a mirror image relation to Usually, they are arranged so as to be parallel along the base line L. in this case,
The fixing of the zipper members 21 and 25 is generally performed by a heat sealing method.

Next, as shown in FIG.
The two surfaces 11a and 15a which have been opened are temporarily closed so that the male member 21 and the female member 25 are fitted to each other.
1, 33 and the upper end 35 are fused to tightly seal the upper part of the container. Thus, the flat bag with a zipper of the present invention is formed, and the contents to be put into the bag are usually filled from the bottom of the flat bag in an open state, and thereafter, the bottom is sealed by fusion sealing.

In the present invention, the case where the contents are finally charged from the bottom of the bag has been described as an example. However, the bottom is sealed from the beginning, and the contents are finally charged from the zipper. Alternatively, the zipper may be closed and finally the upper end 35 may be sealed.

[0016]

According to the present invention, the bag body is formed once by a generally used method, and the bag body is formed from the mouth end of the bag body.
A cut is made inward along one of the folding lines to open the vicinity of the mouth of the bag body, and the zipper is attached to the opened inner surface, so that the zipper member can be easily and reliably mounted.

[Brief description of the drawings]

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

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

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

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

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

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

FIG. 7 is a schematic perspective view of a gas bag.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Flat bag with a zipper 10 ... Bag body part 11, 15 ... Flat part 12, 14 ... Folding line 20 ... Zipper

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B31B 1/90 321 B65D 33/25

Claims (1)

(57) [Claims] 1. A cylindrical bag having a pair of opposed flat portions.
Near the body and one end of the bag body that is to be the mouth of the bag
Flat bag with a zipper and a zipper attached to the inner surface of the zipper
The manufacturing method of the above, from two opposing positions of the mouth end of the bag body portion,
Cut each side inward to a predetermined distance, and cut
Bendable with the straight line connecting the ends of the
Two door-shaped open surfaces are formed, and the open surface is exposed along the above-mentioned base line to expose the inner surface of the open surface.
And then transporting the bag body in the width direction.
The longitudinal direction of the zipper and the direction in which the baseline extends.
The zipper is conveyed in the same direction as the bag body
Then, the male member and the female member of this zipper are
In a mirror image relationship to the inner surface of the open surface
Each allowed fixation, so that fitting the male member and the female member of the zipper
Then, the both open surfaces are closed, and then the vicinity of the cut and the upper end are
It is characterized by sealing and sealing the upper part of the container by fusion
Manufacturing method of flat bag with zipper.