JPH0524535U - Wrapping paper bag - Google Patents

Abstract

(57) [Summary] [Purpose] An outer cylinder valve can be formed using ordinary paper not coated with a thermoplastic resin adhesive.
When forming the packaging paper bag, it can be formed using a low-cost starch-based adhesive. The opening can be closed and adhered by using a piece of sticker paper having a size required to close the opening of the outer cylinder valve, and the cost of the paper bag itself is reduced. The sticker paper piece can be easily inserted and attached to the opening of the outer cylinder valve. A thermoplastic resin adhesive is coated on a side surface of a seal paper piece formed in a size necessary for closing an opening of an outer cylinder valve to a desired thickness. After inserting the seal paper piece into the opening of the outer cylinder valve and melting and hardening the thermoplastic adhesive to attach it, fold back the seal paper piece protruding outside so that it is located in the opening and coat it with the thermoplastic resin adhesive. Fold it back so that the cut surface faces the other inner surface.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention is a packaging paper bag made of kraft paper that has an outer cylinder valve for introducing the contents inside, and more specifically, can be attached to an automatic supply device, and easily heat seals the opening of the outer cylinder valve after supply. Regarding the wrapping paper bag that can.

[0002]

[Prior art]

 In a paper bag made of kraft paper that can be attached to the automatic feeder, an outer cylinder valve made of kraft paper that is in communication with the inside is attached to one side of the upper or lower part of the bag.

That is, after folding the kraft paper into a flat tubular shape, the upper sides of the kraft paper are folded back inward in a triangular shape, and the kraft paper formed in a square shape is adhered to the upper surface of the folded back piece. The upper part of the paper bag containing is folded and bonded so that the ends overlap each other to form a flat cylindrical outer cylinder valve.

In the above-mentioned kraft paper for the outer cylinder valve, a hot melt adhesive, which is a thermoplastic resin adhesive, is applied over the entire inner surface in order to enable heat seal processing after the contents are supplied into the paper bag. It is coated.

[0005]

[Problems to be solved by the device]

 However, although the kraft paper used for the conventional applicable piece is heat-sealed only a few cm from the open end of the outer cylinder valve, the hot melt adhesive is coated on the entire inner surface. ..

Therefore, the cost of the kraft paper itself, which constitutes the outer cylinder valve, has been high, which has been a cause of increasing the manufacturing cost of the packaging paper bag.

When the kraft paper of the outer cylinder valve is attached to the upper surface of the folded piece of the wrapping paper bag in a state where it is attached, a gap is likely to be formed in the mating surface, and the contents leak out from this gap. Have

In order to prevent this drawback, conventionally, the end of the kraft paper of the outer cylinder valve is folded back inward with a predetermined width to expose the coated surface of the hot melt adhesive, and this folded back piece is folded back into the packaging paper bag. It is glued in such a way that it cuts into the inside of one piece.

However, in order to bond the kraft paper of the outer cylinder valve in which the hot melt adhesive is exposed to the folded piece of the packaging paper bag, the kraft paper not coated with the thermoplastic resin adhesive is bonded. Since the ordinary starch-based adhesive used for the above could not be bonded, vinyl acetate-based adhesive had to be used.

Therefore, there is a problem in that the manufacturing process of the paper bag becomes complicated and the manufacturing cost becomes high by switching the adhesive to be used.

The present invention was devised to solve the above-mentioned conventional drawbacks, and the purpose thereof is to use a paper piece of a size necessary for closing the opening of the outer cylinder valve. Another object of the present invention is to provide a wrapping paper bag that can reliably close the opening.

Another object of the present invention is a packaging paper bag which can be manufactured by attaching an outer cylinder valve by using a low-cost starch-based adhesive, which can reduce the cost. To provide.

[0013]

[Means for solving problems]

 Therefore, in the present invention, in a wrapping paper bag in which the upper and lower parts of the main body of the paper bag, in which the outer cylinder valve made of paper is adhered so as to communicate with the inside, is closed, the present invention has a After inserting the seal paper piece coated with the thermoplastic resin adhesive on the side surface, melt and cure the thermoplastic adhesive so that it can be attached, and the thermoplastic resin adhesive on the seal paper piece on the other inner surface of the outer cylinder valve. It is characterized in that the coating surfaces face each other and the opening can be adhesively closed.

[0014]

[Function of the device]

 Since the present invention is configured as described above, when the outer cylinder valve is attached to the main body of the paper bag, the outer cylinder valve is formed by the paper which is not coated with the thermoplastic resin adhesive. It can be attached using a starch-based adhesive.

Since the seal paper piece that closes the opening-side end of the outer cylinder valve is formed to have a size necessary to close the opening, the entire surface of the paper that constitutes the outer cylinder valve is covered with the thermoplastic resin. The cost can be reduced as compared with the one coated with a binder.

Then, after inserting the sticker paper into the opening, it is heat-pressed and adhered, and then folded back so that one coated side surface faces the other inner surface of the opening.

When the opening is heated and pressed in this state, the thermoplastic resin adhesive exposed inside is melt-cured and the opening can be closed without pinholes.

[0018]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing an outline of a packaging paper bag.

FIG. 2 is an exploded perspective view showing a mounting state of the outer cylinder valve.

FIG. 3 is a partial perspective view showing a state in which the seal paper is attached to the outer cylinder valve.

The paper bag body 3 of the wrapping paper bag 1 is formed by folding a quadrilateral kraft paper into a flat tubular shape and adhering the overlapping side edges.

Then, both sides of the upper end portion and the lower end portion of the paper bag body 3 are folded back inward in a triangular shape to form a mounting piece 5 having an opening 7 in the middle portion.

A folding line 9 (shown by a broken line in FIG. 2) is provided on the front side and the back side of the upper end and the lower end of the paper bag body 3 including the attachment piece 5 so that the ends partially overlap each other. ing.

An outer cylinder valve 11 is attached to the upper portion of the paper bag body 3. The outer cylinder valve 11 is made of a craft paper or the like, and has a depth width of the opened mounting piece 5 and a lateral width protruding from the inner end of the mounting piece 5 to the outside of the paper bag body 3 by a predetermined width. A folded-back portion 11a is formed on the edge with an appropriate width.

The outer cylinder valve 11 is bonded with the folded-back portion 11 a inserted into the inner end of the attachment piece 5, and then the folded-back line 9 is formed between the upper ends of the paper bag body 3 including the attachment piece 5. Are folded inward and bonded to form a flat cylindrical body.

In the lower part of the wrapping paper bag 1, after the lower end of the paper bag body 3 including the attachment piece 5 is folded back along the folding line 9, the overlapping edges are adhered to close the opening 7.

A sticker paper 15 is attached to the inner surface of the outer opening 13 of the outer cylinder valve 11.

The sticker paper 15 is made by coating the adhesive surface 15a of kraft paper with a hot-melt resin adhesive at a desired thickness, and the width of the inner edge is larger than the width of the outer opening 13 of the outer cylinder valve 11. The trapezoid is formed in a shorter shape and has an outer edge longer than the width of the outer opening 13 of the outer cylinder valve 11.

Therefore, the lateral width of the sticker paper 15 shown by the broken line 14 in FIG. 3 matches the width of the outer opening 13.

The width from the broken line 14 to the outside is sufficient for closing and adhering the outer opening 13 of the outer cylinder valve 11, and the width from the broken line 14 to the inside is on the inner surface of the outer opening 13. The width is set to be sufficient for adhering the roll paper 15.

After the inner edge of the seal paper 15 is inserted into the outer opening 13 with the inner surface of the outer cylinder valve 11 and the adhesive surface 15a aligned, the outer cylinder valve 11 is heated and clamped. The hot-melt resin adhesive thus coated is melt-cured and adhered.

The seal paper 15 adhered in the outer opening 13 is folded so that its outer edge is located in the outer opening 13.

Next, the operation of the wrapping paper bag 1 configured as described above will be described.

FIG. 4 is a partially cutaway perspective view showing a state where the outer opening 13 of the outer cylinder valve 11 is heat-sealed.

After inserting the inner edge of the seal paper 15 into the outer opening portion 13 of the outer cylinder valve 11, the outer opening portion 13 side of the outer cylinder valve 11 is heat-pressed to attach the seal paper 15. Kick

At this time, since the inner edge of the sticker paper 15 is set to be shorter than the width of the outer opening 13, the sticker paper 15 can be easily inserted into the outer opening 13 and the sticker paper 15 can be easily inserted. Since the position of the broken line 14 in FIG. 3 and the width of the outer opening 13 are the same, when the insertion is restricted, the seal paper 15 can be wedged into the outer opening 13 of the outer cylinder valve 11 to be attached. ..

When the seal paper 15 is attached as described above and the contents are supplied through the cylindrical supply nozzle (not shown) attached to the outer cylinder valve 11 in which the outer opening 13 is widened. The contained items are accommodated in the paper bag body 3 through the opening 7.

After the supply nozzle is removed after the above-mentioned accommodating work, the outer cylinder valve 11 is folded into a flat shape, and then the entire opening side of the outer cylinder valve 11 is heated and pressure-fitted to the outer opening 13 of the outer cylinder valve 11. The hot melt resin adhesive on the adhesive surface 15a of the seal paper 15 thus melted and hardened causes the outer opening 13 to be closed and adhered.

At this time, since the outer edge of the seal paper 15 is set longer than the width of the outer opening 13, the adhered surfaces at both ends of the folded seal paper 15 face the other inner surface of the outer cylinder valve 11. Although the adhesion is restricted by the melted hot melt resin adhesive as shown in FIG. 4, the adhesive melts into both ends of the outer opening 13, so that the outer opening 13 is firmly bonded without pinholes. Can be closed.

The adhesive force of the sticker paper 15 is adjusted by appropriately setting the thickness of the hot melt resin adhesive coated on the adhesive surface 15a.

As described above, in this embodiment, unlike the conventional outer cylinder valve, the outer opening 13 of the outer cylinder valve 11 can be closed with a sufficient adhesive force by using the seal paper 15 having a small area. The production cost of the packaging paper bag 1 can be reduced.

Further, since the outer cylinder valve 11 itself is made of kraft paper which is not coated with a hot melt resin adhesive, a usual starch-based adhesive used when forming the packaging paper bag 1 is used. It can be attached to a part of the paper bag main body 3 and the time to switch between the starch-based adhesive and the vinyl acetate-based adhesive can be eliminated as compared with the conventional manufacturing method, and the manufacturing efficiency is improved. be able to.

In the above description, the side of the seal paper 15 located inside the outer opening 13 is shorter than the width of the outer opening 13, and the side outside the outer opening 13 is longer than the width of the outer opening 13. Although it has a trapezoidal shape, as shown in FIG. 5, two sheets of seal paper 51 and 53 each having a thermoplastic resin adhesive coated on one surface and formed to a length shorter than the width of the outer opening 13 are used, To the outer opening 13 of the outer cylinder valve 11, press one end of each seal paper 51, 53 against each outer cylinder valve 11 and attach them so that the middle portions overlap each other, and then heat press-bond them. It may be the one.

Even in this case, after the seal paper is attached to the outer opening 13 of the outer cylinder valve 11, the portion protruding outward is folded back inward so that the coated surface of the thermoplastic resin adhesive is covered with the seal paper 51. It is made to face the inner surface of the outer cylinder valve to which 53 is not attached.

[0046]

[Effect of the device]

 Therefore, the present invention can provide a wrapping paper bag which can surely close the opening by using a piece of paper of a size required to close the opening of the outer cylinder valve.

In addition, the present invention can provide a wrapping paper bag which can be manufactured by attaching an outer cylinder valve using a low cost starch-based adhesive and which can be manufactured at low cost. Noh.

[Brief description of drawings]

FIG. 1 is a perspective view showing an outline of a wrapping paper bag.

FIG. 2 is an exploded perspective view showing a mounted state of an outer cylinder valve.

FIG. 3 is a partial perspective view showing a state in which a seal sheet is attached to an outer cylinder valve.

FIG. 4 is a partially cutaway perspective view showing a state where the outer opening of the outer cylinder valve is heat-sealed.

FIG. 5 is a schematic perspective view showing a modified embodiment of the present invention. 1: Wrapping paper bag 3: Main body 11: Outer cylinder valve 13: Outer opening 15: Seal paper

Claims (4)

[Scope of utility model registration request] 1. A wrapping paper bag having a paper bag main body having an upper part and a paper bag main body adhered so as to communicate with the inside and having the upper part and the lower part closed. After inserting a piece of sealing paper coated with a plastic resin adhesive, melt and cure the thermoplastic adhesive so that it can be attached, and face the inner surface of the outer cylinder valve with the thermoplastic resin adhesive coating surface of the sealing paper piece. A wrapping paper bag characterized in that the opening can be adhesively closed. 2. A wrapping paper bag having a paper bag main body having an upper part and a paper bag main body bonded to communicate with the inside and having the upper part and the lower part closed. After inserting a trapezoidal piece of sealing paper coated with a plastic resin adhesive, the inner edge of which is shorter than the opening width of the outer cylinder valve and the outer edge of which is longer than the opening width, the thermoplastic adhesive is melted and cured. The packaging paper bag is characterized in that the opening can be adhesively closed by facing the other inner surface of the outer cylinder valve with the thermoplastic resin adhesive coated surface of the seal paper piece. 3. A wrapping paper bag having a paper bag main body having an upper part and a paper bag main body bonded to communicate with the inside and having the upper part and the lower part closed, wherein heat is applied to one side of the outer opening of the outer cylinder valve. A plastic resin adhesive is coated, and a plurality of pieces of sealing paper having a length shorter than the opening width are inserted so that the outer ends of the pieces of sealing paper come into close contact with the ends of the openings and overlap at the middle of the openings. A package characterized in that the thermoplastic adhesive can be melt-cured to be attached, and the opening can be adhesively closed by making the coating surface of the thermoplastic resin adhesive on the seal paper piece face the other inner surface of the outer cylinder valve. paper bag. 4. A piece of seal paper thermally bonded to the opening of the outer cylinder valve is folded back so that one side coated with a thermoplastic resin adhesive faces the other inner surface of the outer cylinder valve.
Wrapping paper bag.