JPH066033Y2 - Multi-layer bag - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a multi-layer bag, and more particularly, to a multi-layer bag with staircase pleats (commonly called a pleated pinch bag) that has leak-proof measures and is easy to manufacture. .

[Conventional technology]

At the bent portion formed at the end of the multi-layer pleated pinch bag, the fold and the inner surface of the wall surface of the bag body facing the fold are adhered to each other to ensure the closure of the upper and lower ends, and A proposal for preventing leakage of contents from a portion is made in Japanese Utility Model Publication No. 50-28976.

In order to achieve the same purpose, Japanese Patent Publication No. 59-44259 discloses only a bag wall having closure flaps at the upper and lower ends of the bag and the inner surfaces of the fold wall adjacent to the bag wall.
It is disclosed that it is sufficient to bond them to each other, including the fold line portion of the bag body side edge that is sandwiched between these two portions.

Further, in actual terms, since the upper and lower ends are closed, when the flaps for closing are bent from the respective lips toward the other wall side toward the center of the bag body, the position of the folding line of the bag body side edge does not shift. It has been proved that if the inner surfaces of the bag wall having the closing flap portion and the fold wall portion adjacent thereto are partially adhered to each other, for example, in a plurality of spots, it is sufficiently effective to prevent leakage.

[Problems to be solved by the invention]

However, in the bag manufacturing process, it was extremely difficult to apply an adhesive to the inner surface of the bag body and bond it on the machine. That is, even if the adhesive can be applied to the inner surface of the innermost layer paper while the base paper is flat on the cylinder making machine,
The adhesive applied in the tube-making process comes into contact with the molded plate and is removed, or it adheres to the molded plate and causes trouble.

The present invention eliminates the above-mentioned drawbacks of the prior art, mechanically applies an adhesive that adheres at room temperature on a cylinder making machine, and forms an inner surface of a bag wall having a closing flap and a fold wall adjacent to the bag wall. An object of the present invention is to provide a multi-layer bag having a structure that can be easily adhered to each other.

[Means for solving problems]

To achieve the above object, the multi-layer bag of the present invention is composed of multiple layers and has pleats on both sides, and one of the front and rear walls of the upper and lower ends of the bag body is closed above and below the other, respectively. Front and rear edges of the upper and lower mouth edges are arranged in a stepwise manner in the upper and lower directions, and the closing flap portions at the upper and lower end portions are respectively provided from the respective edges. Bending toward the other wall side near the center of the bag body, in a multi-layer bag with staircase pleats that is attached and closed on the surface of the bag body, at least the folding of the fold wall portion adjacent to the closing flap portion The perforation is provided in the layer constituting the inner surface of the bag inside the portion, and at the site of the perforation, an adhesive is applied between the layer adjacent to the outer side of the perforation, and the adhesive is exuded from the perforation. With a bag wall and The inner surface mutual fold walls, characterized in that the adhesion at the four corners of the bag body.

[Action]

In the multi-layer bag of the present invention, perforations are provided at the four corners of the bag body, inside the folding folds at the upper and lower ends, in the layers forming the inner surface of the fold wall portion adjacent to the bag wall having the closing flap portion. , At the perforation site,
Since the adhesive is applied between the layers adjacent to the outer side, the applied adhesive does not contact the forming plate of the cylinder making machine,
After passing through the forming plate, the inner surfaces of the bag wall having the closing flap and the fold wall adjacent to the bag wall are adhered to each other at the four corners of the bag with an adhesive that oozes out from the perforation. , Bending the closing flaps at the lower end toward the other wall from the mouth edge toward the center of the bag, and when attaching and closing the bag on the bag surface, the position of the folding line on the bag side edge does not shift. The function of preventing leakage of the contents from these parts is achieved.

〔Example〕

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings, but the present invention is not limited thereto.

FIG. 1 is a perspective view of a three-layer tubular body in which a multilayer bag of one embodiment of the present invention is formed, as seen from the front wall side, and FIG. 2 is the tubular body of FIG. 1 from the rear wall side. 3 and 4 are perspective views of the tubular body shown in FIGS. 1 and 2 as viewed from the inner layer side. In FIG. 4, a part of the inner layer paper is shown for convenience of explanation. It shows the condition after excision. FIG. 5 is a partial perspective view showing a state in which a fold at one corner of the tubular body of FIG. 1 is opened.
Figure (a) shows the state immediately after passing through the forming plate of the cylinder making machine, Fig. 5
(b) shows the state after a certain time has passed.

In the figure, reference numeral 1 is a cylindrical front wall, 2 is a cylindrical rear wall, 3 is a closing flap portion, 4 is a fold front wall, 5 is a fold rear wall, 6 is a folding curve, 7 is a perforation, 8 is an adhesive, 9 is a stretched portion or a is an outer layer, b is an intermediate layer, and c is an inner layer.

The multi-layer bag of this embodiment is formed from the tubular body shown in FIGS. 1 and 2. That is, it consists of 3 layers a, b, c, and 9
a, 9b, and 9c are outer layer a, middle layer b, and inner layer c that have pleats on both sides, and the rear wall 2 of the tubular body projects above the front wall 1 at the upper end, and At the lower end, the front wall 1 projects downward from the rear wall 2 to form closing flaps 3, and at the upper end, the closing flaps 3
The outer wall a, the middle layer b, and the inner layer c are arranged in this order on the rear wall 2 that forms the inner wall c, the inner layer c, the middle layer b, and the outer layer a are arranged on the front wall 1 in this order, and the closing flap portion 3 is formed at the lower end portion. The inner wall c, the middle layer b, and the outer layer a are arranged in this order from the top on the front wall 1 forming the above, and the outer layer a, the middle layer b, and the inner layer c are arranged in this order from the top on the rear wall 2. It should be noted that at any one of the ends of such a tubular body, the closing flap portion 3 is bent along the folding curve 6 onto the wall on the opposite side to be attached / closed to the surface of the tubular body to form an open bag. After filling the contents in the opening bag, the closing flap portion 3 at the opening end is bent along the bending line 6 on the wall on the opposite side, and is stuck to the surface of the bag body to be closed. Since these are exactly the same as the case of the known pinch bag, detailed description will be omitted.

In the multi-layer bag of the present invention, as shown in FIG. 3, the closing flap portions 3 are provided at the four corners of the stepped pleated tubular body.
In the folded part for closing the bag end of the fold wall adjacent to
The perforations 7 are provided in the layer forming the inner surface of the bag, that is, in the inner layer c, at the upper end of the fold back wall 5 and at the lower end at the portion closer to the end than the folding curve 6 of the fold front wall 4, and as shown in FIG. As shown in FIG. 3, an adhesive 8 is provided at the outside of the perforation 7, that is, between the intermediate layer b and the interlayer.
After the application, the adhesive 8 oozing out from the perforation 7 with the passage of time causes the inner surfaces of the bag wall having the flaps 3 for closing at the four corners of the tubular body and the fold wall adjacent to the bag wall, that is, the upper end. The inner surfaces of the rear wall 2 and the pleated rear wall 5 are adhered to each other at the portion, and the inner surfaces of the front wall 1 and the pleated front wall 4 are adhered to each other at the lower end.

The multi-layer bag of this embodiment can be automatically manufactured using conventional bag making equipment. That is, using a normal cylinder-making machine (commonly known as step-cut tuber) having a perforation device and an adhesive application device for common-layer bonding of multi-layer bags, which is commonly referred to as a lateral glue device, is used to manufacture a tubular body with step-cutting pleats. In doing so, when the base paper is in a flat state, the perforation 7 can be provided at a predetermined position of the inner layer paper c together with the perforations for cutting the upper and lower ends by the perforation device. Further, the adhesive 8 is an adhesive of a type that is bonded at room temperature, which is the same as the adhesive that is usually used for interlayer bonding of multilayer bags, and at the same time when the adhesive for interlayer bonding is applied by the horizontal glue device, the inner surface of the intermediate layer paper b is Can be applied to the same site as the perforation 7. Next, as shown in FIG. 5 (a), the base paper has an adhesive 8 for perforation 7
While still exuding from the sheet, it passes through the forming plate, is formed into a tubular shape, and is separated into a tubular body having a predetermined length along the above-described upper and lower end cutting perforations by the cutting device of the tube making machine. After passing through the molding plate, the adhesive 8 exudes from the perforations 7 as shown in FIG. 5 (b), and the inner surfaces of the rear wall 2 and the fold back wall 5 are mutually at the upper end, and at the lower end, the front. The inner surfaces of the wall 1 and the pleat front wall 4 are adhered to each other.

In the multi-layered bag of the present invention, the bag layer provided with perforations for exuding the adhesive is a layer that constitutes the inner surface of the bag at the adhesively bent portion of the fold wall portion adjacent to the closing flap portion, The bag is not limited to the innermost layer and may be the intermediate layer.

Further, the shape of the perforation 7 is not limited to the intermittent line extending in the width direction of the bag shown in the drawings, and for example, one at each of the four corners of the bag.
It may be a single hole or a plurality of round holes.

[Effect] In the multi-layer bag of the present invention, at the four corners of the bag body, in the folding folds at the upper and lower ends, the layers forming the inner surface of the fold wall adjacent to the bag wall having the closing flap are formed. Perforation is provided, and at the site of the perforation,
Since an adhesive of a type that adheres at room temperature is applied between the layers adjacent to the outside thereof, the applied adhesive does not contact the forming plate of the cylinder making machine, and after passing through the forming plate, With the adhesive that oozes out from the perforations, the inner surfaces of the bag wall having the closing flap portion and the fold wall portion adjacent thereto are adhered to each other at the four corners of the bag body.
Bending the closing flap portion of the lower end from each mouth edge toward the other wall side near the center of the bag body, when sticking on the bag body surface and closing, the position of the folding line of the bag body side edge does not shift, It is possible to prevent the contents from leaking from these parts.

As described above in detail, according to the present invention, it is possible to provide a staircase-cutting pleated multi-layer bag (commonly called a pleated pinch bag) which has a leak-proof measure and is easy to manufacture.

[Brief description of drawings]

FIG. 1 is a perspective view of a three-layer tubular body in which a multilayer bag of one embodiment of the present invention is formed, as seen from the front wall side, and FIG. 2 is the tubular body of FIG. 1 from the rear wall side. 3 and 4 are perspective views of the tubular body shown in FIGS. 1 and 2 as viewed from the inner layer side. In FIG. 4, a part of the inner layer paper is shown for convenience of explanation. It shows the condition after excision. FIG. 5 is a partial perspective view showing a state in which a fold at one corner of the tubular body of FIG. 1 is opened.
Figure (a) shows the state immediately after passing through the forming plate of the cylinder making machine, Fig. 5
(b) shows the state after a certain time has passed. 1 to 5, 1 ... Front wall of tubular body, 2 ... Rear wall of tubular body 3, Flap for closing, 4 ... Front wall of pleats 5 ... Rear wall of folds, 6 ... Folding curve 7 ... Perforation, 8 ... Adhesive 9 ... Trunk, a ... Outer layer b ... Intermediate layer, c ... Inner layer

Claims (1)

[Scope of utility model registration request] 1. A closure flap comprising a plurality of layers and having pleats on both sides, and one of upper and lower ends of the bag body having closure flaps projecting upward and downward from the other, respectively. The ends of each layer of the front and rear walls of the lower mouth edge are arranged in a stepwise manner in the upper and lower directions, and the closing flaps at the upper and lower ends are located on the other side of the mouth edge toward the center of the bag body. In a multi-layer bag with staircase folds that is folded to the side and attached to the bag surface to close it,
At least a perforation is provided in the layer forming the inner surface of the bag inside the folding portion of the fold wall portion adjacent to the closing flap portion, and at the site of the perforation, between the layer and the layer adjacent to the outside thereof. Apply adhesive,
A multi-layer bag characterized in that an inner surface of a bag wall having the closing flap portion and an inner surface of a fold wall portion adjacent to the bag wall are adhered to each other at four corners of the bag body with an adhesive that exudes from the perforations.