JP2875978B2 - Packaging bag and its manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging bag in which a moisture-proof cylindrical body and a paper cylindrical body are laminated in multiple layers, the opening end of which is folded and closed, and a method for manufacturing the same.

[0002]

2. Description of the Related Art The applicant of the present invention has previously disclosed a packaging bag comprising a multi-layered cylindrical body, in which the opening edge of the innermost cylinder is projected from the opening edge of the other cylindrical body. No.-52139, which is composed of a multi-layered cylinder, the opening edge of the innermost cylinder is projected from the opening edge of the other cylinder, and the end of the innermost cylinder is connected to another cylinder. Is bent along the opening edge of the opening to form an overlapped portion, and furthermore, the innermost layer cylindrical body and the other cylindrical body are bent from the middle of the overlapped portion to form a folded portion, and the folded portion is covered with a sticking paper. Of the packaging bag thus obtained is disclosed in Japanese Unexamined Utility Model Publication No. 2-66443.
No. proposed.

In the case of manufacturing a multilayer bag, perforations are formed at equal intervals in the long tubes constituting each layer, and these long tubes are laminated and then cut along the perforations. Therefore, a cylinder projecting at one opening edge from the other cylinder is immersed at the other opening edge from the other cylinder. Further, since the packaging bag, which is closed by folding one opening edge, is filled with the contents and then sewn, the other opening edge is often trimmed.

In the above-mentioned conventional packaging bag, when a moisture-proof cylindrical body is laminated on the intermediate layer, when another cylindrical body is cut along the innermost cylindrical body at the other opening edge, cut-off pieces are cut off. Fragments (polyethylene film or the like) of the moisture-proof cylindrical body are mixed into (cut tea). However, when environmental problems have been highlighted in recent years, the processing of this cut tea has become a problem. In recent years, this has become a very serious problem in the case of mass production, because the trader does not pick up the cut tea mixed with the polyethylene film.

[0005] In addition, even if a moisture-proof cylindrical body is laminated,
Since the moisture-proof cylinder is shorter at the one opening edge than the innermost cylinder, the opening end of the moisture-proof cylinder only turns once, and the sealing property at the folded portion is insufficient.

[0006]

DISCLOSURE OF THE INVENTION The present invention is intended to provide a highly sealed folded and closed end, which does not require complicated processing during the folding operation, and is used for sewing after filling the contents. It is another object of the present invention to provide a packaging bag in which a piece of a moisture-proof cylindrical body is not mixed into a cut-off piece generated when trimming an end opposite to a closed end, and a method of manufacturing the same.

[0007]

In order to achieve the above-mentioned object, a packaging bag of the present invention comprises a laminate of one moisture-proof cylinder and a plurality of paper cylinders, and an innermost layer. A paper cylinder, then a moisture-proof cylinder, and a paper cylinder in the outer layer, and at one opening edge, the innermost layer cylinder and the next The opening edges of the moisture-proof cylinder are aligned so as to protrude from the opening edge of the outer cylinder, and the one opening edge is folded and closed. Thereby, at the other opening edge, the opening edge of the innermost cylinder and the moisture-proof cylinder is immersed below the opening edge of the outer cylinder, so that the other opening is adjusted to the shortest cylinder. Pieces of the moisture-proof cylinder are not included in the cut-off pieces generated when the edges are trimmed.

In addition, the ends of the innermost cylinder and the moisture-proof cylinder are bent to one side along the opening edge of the outer cylinder, and are superposed on the outer surface of the outermost cylinder. It is preferable to form a folded portion, form a folded portion by bending all the cylinders from the middle of the overlapping portion in parallel with the opening edge thereof, and attach a strength paper to cover the folded portion. As a result, the open ends of the innermost paper cylinder and the moisture-proof cylinder are folded three times on the outer surface of the bag to improve the sealing of the folded part, and the number of times of folding is twice as in the conventional case. Only needs to be done.

In the method of manufacturing a packaging bag of the present invention, perforations serving as opening edges are formed along a width direction on a long base paper constituting an innermost cylindrical body to constitute a moistureproof cylindrical body. After laminating the long moisture-proof film and the base paper constituting the paper cylinder laminated on the outside of the long moisture-proof film, these two moisture-proof films and the base paper are perforated along the width direction as the opening edges along the width direction. The base paper constituting the innermost cylinder, the moisture-proof film and the base paper constituting the paper cylinder laminated on the outer layer are relatively moved to form a sewing machine for the moisture-proof film. After matching the eyes with the perforations of the base paper constituting the innermost cylindrical body, and shifting the perforations of the base paper constituting the paper cylinder laminated on the outer layer, all the base papers are overlapped to form a multi-layer. Form a long tube, then separate each tube along the perforation, Closing folded one open end innermost layer of the cylindrical body and moisture resistance of the cylindrical body protrudes from the paper of the cylindrical body that is laminated on the outer layer. By perforating the base paper under the moisture-proof film and forming the perforations at the same time, it is possible to easily and accurately perform the perforation of the difficult-to-handle moisture-proof film.

[0010] Further, the opening edge of the stacked cylinder is arranged in parallel to the transfer direction of the bottomer, and one opening end of the stacked cylinder is closed by folding it with the bottomer, and at the same time, the side of the bottomer is closed. Cutting the other opening edge of the outer layer cylinder to the same length as the other opening edge of the innermost layer cylinder and the moisture-proof cylinder by the detachably incorporated slitter is performed during the transfer. It is not necessary to stop the cylinder to cut and align the other open end, so that the working efficiency is improved and the cut-off pieces are naturally dropped and discharged, which is desirable.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a packaging bag 1 is composed of a three-layer cylinder bag, and a kraft paper cylinder 2 is formed on the innermost layer.
Next, a moisture-proof cylindrical body 3 is further laminated on the outer side of the cylindrical body 3 made of kraft paper. The cylindrical bodies 2, 3, and 4 are bonded to each other at positions where the side edges of the base paper are shifted from each other to form a cylindrical shape, and the both sides are woven inward to form a crease portion 10. The moisture-proof cylinder 3 is made of a moisture-proof film such as a polyethylene film.

The opening edges of one of the innermost cylindrical body 2 and the moisture-proof cylindrical body 3 are aligned to the same length and protrude from the one opening edge of the outermost cylindrical body 4 by a width L. And a protruding end 5 is formed. Further, by forming the protruding end portion 5, the other open edge of the innermost layer cylindrical body 2 and the moisture-proof cylindrical body 3 is wider than the other open edge of the outermost layer cylindrical body 4 by a width L.
Only immersed.

One open end of the packaging bag 1 is folded and closed as follows. First, as shown in FIG. 2, the protruding ends 5 of the innermost cylinder 2 and the moisture-proof cylinder 3 are bent to one side along the opening edge of the outermost cylinder 4, and Is superposed on the outer surface of the cylindrical body 4 to form a superposed portion 6.

Next, as shown in FIG. 3, from the middle of the overlapping portion 6, all the cylinders 2, 3 and 4 are parallel to the opening edge and the same side as the projection end 5 is bent. To form a folded portion 7. As a result, the open ends of the innermost layer cylinder 2 and the moisture-proof cylinder 3 are bent three times, and the innermost layer cylinder 2 and the moisture-proof layer whose leading edge is folded inward and superimposed on the outside. Since it is covered with the end of the cylindrical body 3, the sealing performance is improved.

Next, a band-shaped strength paper 8 is stuck over the outer surface of the cylindrical body 4 of the outermost layer from the surface of the folded portion 7, and the surface is stretched over the entire length in the width direction so that the folded portion 7 is not peeled off. Cover. A tearing tape 9 is adhered to the back surface of the strength paper 8 along the width direction.
Can be pulled by a finger to break the strength paper 8 and open the folded portion 7.

Further, as shown in FIG. 4, the other opening edge of the outermost cylindrical body 4 is cut by the width L to form the other opening of the innermost cylindrical body 2 and the moisture-proof cylindrical body 3. After the contents are filled in the packaging bag 1, the other open edges of all the cylinders 2, 3 and 4 can be securely sewn with a sewing machine.

The above description is for a three-layer packaging bag 1; however, a four-layer or more packaging bag in which a suitable number of kraft paper cylinders are laminated outside a moisture-proof cylinder. It can also be. Further, in the example shown in the drawing, the opening edge of the other cylindrical body 4 is formed linearly, but may be formed in a zigzag shape.

Next, a method of manufacturing the packaging bag 1 will be described. As shown in FIG. 5, a perforation forming part B is
A tube forming portion C and a break portion D are provided in this order along the transport direction, and a first roller 11a and a second roller 11b are provided at the entrance of the perforation forming portion B, and their respective axes are transported by the bag making machine A. They are arranged side by side so as to intersect the direction. The first roller 11a guides the long base paper 12a forming the innermost cylinder 2 and the second roller 11b guides the long base paper 12c forming the outermost cylinder 4. A long moisture-proof film 12b constituting the moisture-proof cylinder 3 is disposed between them.

The base paper 12a pulled out from the first guide roller 11a is supplied to the first perforation forming device 13a.
, So that the cylinder 2
Perforations along the width direction are formed at intervals corresponding to the length. In addition, the moisture-proof film 12b is the second roller 1
1b, and then fed to a second perforation forming device 13b, whereby the moisture-proof film 12b and the base paper 12c are placed on the base paper 12c at intervals corresponding to the length of the cylindrical bodies 3, 4. Each time a perforation along the width direction is formed simultaneously. At this time, since the base paper 12c is overlapped under the slippery moisture-proof film 12b, the male mold is inserted into the base paper 12c placed on the female mold from the moisture-proof film 12b side superimposed on the base paper 12c. Thereby, the perforations can be formed easily and accurately.

The first perforation forming device 13a
The second perforation forming device 13b is linearly cut, and the innermost base paper 12a, the moisture-proof film 12
A straight perforation is formed in b and the outermost base paper 12c.

Further, the first perforation forming device 13a and the second perforation forming device 13b,
And second length adjusting devices 20a and 20b.
As shown in FIG. 6, each length adjusting device 20a, 20b
Each of the shaft roller 21 and an adjustment roller 22 rotatable around a center axis of the shaft roller 21. The first perforation forming device 13 a and the second sewing machine are moved by moving the adjustment roller 22. The base paper 12a and base paper 1 from the eye forming device 13b to the collective delivery roll 23 for collecting the base paper 12a, the moisture-proof film 12b, and the base paper 12c.
The length of 2c can be adjusted.

The innermost base paper 12a is wound around the first length adjusting device 20a and the outermost base paper 12c is wound around the second length adjusting device 20b, and the shafts of the respective length adjusting devices 20a and 20b are wound. The length of the path passing through the roller 21 and the adjustment roller 22 is adjusted to be different. As a result, the innermost base paper 12
a and the outermost base paper 12c are relatively moved so that the perforations of the innermost base paper 12a coincide with the perforations of the moisture-proof film 12b, and only the perforations of the outermost base paper 12c are slightly shifted. Has become.

Thereafter, as shown in FIG. 1, all the base papers, that is, the base paper 12a forming the innermost layer, the moisture-proof film 12b forming the intermediate layer, and the base paper 12c forming the outermost layer are superposed on each other to form a tube forming portion C. Is sent to the tube forming device 14 installed in the tub. The tube forming apparatus 14 forms a multi-layer (three-layer) long tube 19.

Feed rollers 15a, 15a for pinching and supplying the long tube 19 are arranged at a break D provided downstream of the tube forming apparatus 14, and immediately after that, a pair of tension rollers 15, 15 are installed. You. Further, a block holder 17 is provided downstream of the long tube 19 so that the block holder 17 can be intermittently approached and separated. A pair of pinch rollers 16, 16 are provided on both sides in the transport direction around the block holder 17.
Is installed.

Then, the long tube 19 is fed to the feeding roller 1.
5a, 15a and pulling rollers 15, 15 continuously pull at a constant speed, and the block holder 1 downstream therefrom is pulled.
7, the elongate tube 19 is temporarily held, and the elongate tube 19 is pinched and pulled by the pinch roller 16 in the advancing direction, whereby the base paper 12a, the moisture-proof film 12b and the base paper 12c are perforated. To separate the cylinders 2, 3, and 4. Then, the block holder 17
The distal end of the long tube 19 is engaged with the pinch roller 16 on the front side in the traveling direction.

Further, the broken cylinders 2, 3, and 4 are transferred to a well-known bottlemer E provided downstream of the broken portion D, as shown in FIG. The bottler E is provided with a bag supplying section F, a folding closing section G, and a counting and discharging section H in this order along the transport direction, and a slitter 18 is detachably attached to the side of the folding closing section G. It is.

The cylindrical bodies 2, 3, and 4 are placed on the bag supplying section F such that the other opening edge faces the side where the slitter 18 is installed, and the tubular bodies 2, 3, and 4 are downstream as they are along the arrow direction. Is transferred to Then, in the folded closing portion G, one opening edge of the stacked cylinders 2, 3, 4 is folded and closed as described above, and the other end of the outermost cylinder 4 is slitter 18. The cylindrical body 2 whose opening edge is the innermost layer
And, it is cut and aligned to the other opening edge of the moisture-proof cylindrical body 3, and the packaging bag 1 is completed. Therefore, the cylindrical bodies 2, 3,
4 is trimmed without stopping in the middle of the transfer, and the cut pieces naturally fall below the bottommer E.

In the case of manufacturing a packaging bag in which a plurality of layers of paper cylinders are laminated on the outside of a moisture-proof cylinder, the rollers around which the base paper is wound are provided by the number of cylinders.
Perforations are formed on the base paper drawn from these rollers before lamination. Furthermore, as another embodiment of the present invention, a packaging bag in which the opening edge of the innermost cylinder and the opening edge of the next moisture-proof cylinder are aligned and protruded from the opening edge of the other cylinder. In the above method, a perforation is formed on the innermost layer and the next layer so that the opening edge is linear, and a perforation forming device is formed on the base paper forming the cylindrical body of the outer layer by step cutting. Alternatively, a perforation may be formed in a zigzag shape.

[0029]

According to the first aspect of the present invention, the moisture-proof cylindrical body projects longer than the outer-layer cylindrical body together with the innermost-layer cylindrical body at one of the open ends that are closed by folding. In addition, a moisture-proof layer is interposed over the entire length of the folded portion, so that the tightness of the folded portion is very good, and the thickness of the folded portion is smaller than that of the case where all the edges of the cylindrical body are aligned. Can be made thinner. When filling the contents and closing the other open end by sewing with a sewing machine, a piece of the moisture-proof cylindrical body is mixed in a cut-off piece cut and aligned to the shortest cylindrical body. Therefore, the processing of the cut-off pieces becomes easy.

According to the second aspect of the present invention, since the opening end of the innermost layer cylinder and the moisture-proof cylinder are bent three times to prevent the opening from opening, the sealing performance is improved. The number of times of folding is further improved, and the number of times of folding is the same as that of the conventional one, so that the folding is not troublesome. Further, it is possible to prevent the folded portion from being peeled off by the strength paper.

According to the third aspect of the present invention, the base paper constituting the innermost cylindrical body and the moisture-proof film constituting the moisture-proof cylindrical body are overlapped and simultaneously subjected to perforation, thereby making it difficult to handle the moisture-proof bag. The perforation can be easily and accurately formed on the water-resistant film, and it is possible to cope with a moisture-proof film of any material.

According to the fourth aspect of the present invention, in a bottomer that transfers at a speed higher than the transfer speed of the bag making machine, the opening edges can be trimmed without stopping the machine in the middle of the transfer. The work efficiency is much higher than the conventional method in which the transfer is stopped during the formation of the cylindrical body and the other opening edge is cut off. In addition, while the bag making machine is difficult to discharge the cut pieces due to the structure of the machine, the cut off is performed by the slitter built into the side of the bottomer, so that the cut pieces drop naturally and the discharge is performed. It will be easier.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention before closing one open end of a packaging bag.

FIG. 2 is a cross-sectional view of one opening end in the middle of closing.

FIG. 3 is a cross-sectional view of one open end after closure.

FIG. 4 is an overall perspective view of a packaging bag showing an embodiment of the present invention.

FIG. 5 is a schematic diagram of a bag making machine.

FIG. 6 is a side view of a main part of the length adjusting device.

FIG. 7 is a plan view of a bottommer.

[Explanation of symbols]

 Reference Signs List A bag making machine B perforation forming part C tube forming part D break part E bottler F bag supply part G folding closing part H counting discharge part 1 packaging bag 2 innermost cylinder 3 moistureproof cylinder 4 outermost layer 5 Projecting end portion 6 Overlapping portion 7 Folding portion 8 Strength paper 9 Cutting tape 10 Folding portion 11a First roller 11b Second roller 12a Base paper constituting the innermost cylinder 12b Moistureproof film 12c Outermost layer Base paper forming cylindrical body 13a First perforation forming device 13b Second perforation forming device 14 Tube forming device 15 Pulling roller 15a Feeding roller 16 Pinch roller 17 Block holder 18 Slitter 19 Long tube 20a First long Length adjusting device 20b Second length adjusting device 21 Axial roller 22 Adjusting roller 23 Collecting delivery roll

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-66443 (JP, U) JP-A 53-95326 (JP, U) JP-A 54-32518 (JP, U) Registered utility model 3021719 (JP, U) JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) B65D 30/00-33/38 B31B 1/00-49/04

Claims (4)

(57) [Claims] 1. A single moisture-proof cylinder and a plurality of paper cylinders are laminated, and a paper cylinder is formed on the innermost layer, a moisture-proof cylinder is formed on the innermost layer. A paper cylinder is disposed in the outer layer, and the opening edge of the outer layer cylinder is aligned with the opening edge of the innermost layer cylinder and the next moisture-proof cylinder at one opening edge. A packaging bag, wherein the packaging bag is further protruded, and the one opening edge is folded and closed. 2. An end portion of the innermost cylinder and the moisture-proof cylinder at the one opening edge is bent to one side along an opening edge of the outer cylinder, and an outermost cylinder is bent. A superimposed portion is formed by superimposing on the outer surface of the body, and all the cylinders are bent from the middle of the superposed portion in parallel with the opening edge to form a folded portion, and a strength paper is adhered over the folded portion. The packaging bag according to claim 1, wherein: 3. A long moisture-proof film that forms a moisture-proof cylindrical body by forming perforations along the width direction on the long base paper that forms the innermost cylindrical body along the width direction. After the base paper constituting the paper cylinder laminated on the outside is overlapped, perforations serving as opening edges are simultaneously formed in the two moisture-proof films and the base paper along the width direction, and then, The base paper constituting the innermost cylinder, the base paper constituting the paper cylinder laminated on the moisture-proof film and the outer layer are relatively moved,
After matching the perforations of the moisture-proof film with the perforations of the base paper constituting the innermost cylinder, and shifting the perforations of the base paper constituting the paper cylinder laminated on the outer layer,
All the base papers are laminated to form a multi-layered long tube, and then each cylinder is separated along the perforation, and furthermore, the innermost cylinder and the moisture-proof cylinder are laminated on the outer layer. 2. The method for manufacturing a packaging bag according to claim 1, wherein one of the open ends protruding from the cylindrical body is folded and closed. 4. An opening edge of the stacked cylindrical body is arranged in parallel with the direction of transfer of the bottomer, and one open end of the stacked cylindrical body is closed by folding with the bottomer.
The other opening edge of the outer-layer cylinder is trimmed to the same length as the other opening edge of the innermost-layer cylinder and the moisture-proof cylinder by a slitter detachably attached to the side of the bottomer. A method for producing the packaging bag according to claim 3.