JPH04142257A - Paper bag - Google Patents

Abstract

PURPOSE:To obtain a paper bag having a closed bottom part sealed tightly to make the leakage of its contents difficult, easy to open and inexpensive to manufacture by a method wherein one side edge of a bag body is first folded and the two successive folding thereof is then made in a manner to effect its curling to form a three-folded part. CONSTITUTION:The closed bottom part 16 of a paper bag 10 is formed by folding an outer layer cylindrical body 11 projecting from the outer side edge 12b of an intermediate layer cylindrical body 12 of a stepped surface on cylindrical bodies 11 and 12 at the outer and intermediate layers and the end part of an inner cylindrical body 13 according to a folding line 17 extending along the edge 12b of the intermediate layer cylindrical body 12. A further folding is then made toward the same side as in the first folding according to a second folding line 18 extending along the inner side edge 11c of the outer layer cylindrical body 11 in a manner to effect its curling. Another folding is made of this folded part according to a third folding line 19 in a manner to effect its curling to fold all the layers in three so as to form a three- folded part 20. A protective paper 21 is placed over this three-folded part 20 in an enclosing manner and the edge parts thereof are fixedly attached to the outer wall surfaces of a bag with an adhesive agent 22 to completely close the folded part.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a paper bag, and more particularly, to a paper bag made of a multi-layer pleated cylindrical body, the bottom of the bag serves as an opening for taking out the contents. Regarding closed structures.

(Prior art) Conventionally, the bottom of a packaging body consisting of a multi-layer pleated cylindrical body is folded, and this folded part is wrapped and closed with a patch of paper with opening tape, and this closed part is used for future storage. Paper bags with openings have recently been attracting attention because of their ease of opening. The bottom closing portion of this type of paper bag is constructed as disclosed in Japanese Patent Application Laid-Open No. 2-98551 in order to reduce the number of times the bottom end of the packaging body is bent and to have a triple folded structure with less leakage. It had been.

That is, the bottom closing part of the paper bag disclosed in this publication is made by folding the bottom side end of the packaging body 1 once along the first fold line 2, as shown in FIGS. A tear-opening tape 5 that is bent in the opposite direction or in the same direction as the first folding direction at a second folding line 3 that runs approximately at the center, and extends over both outer wall surfaces of the outer layer so as to surround this folded portion 4. It was constructed by attaching a padding paper 6 with a pad and adhering it to each outer wall surface at each end thereof.

(Problem to be Solved by the Invention) However, the bottom closure part of the conventional paper bag described above has a certain degree of resistance to leakage due to its unique folding method (the folded part is triple folded when folded twice). It is very effective, but it can be used when a large pressure is momentarily applied to the outer wall of a paper bag whose mouth is closed after the contents have been filled, such as in the case of contents such as polyvinyl chloride powder. Leakage sometimes occurred from the bottom opening of the main body, which constitutes the bent portion.

In addition, when forming a closing part by bending the bottom side end of the packaging body as described above, the cutting dimension of the packaging body (the length dimension in the longitudinal direction of one side wall surface of the packaging body) must be made smaller than that of the normal packaging body. % length, which naturally led to the problem of increased paper usage and higher manufacturing costs.

The purpose of the present invention was to solve the problems of the conventional art, and the present invention is designed to solve the problems of the prior art. To provide a paper bag which is provided with an easy-to-open bottom closing part that prevents contents from leaking from the bottom opening of a main body, reduces the amount of paper used, and is manufactured at a low cost.

(Means for Solving the Problem) The paper bag of the present invention includes a plurality of pleated cylindrical bodies, and the end edge of at least one of the arbitrary cylindrical bodies is connected to the edge of the other cylindrical body. One end of the packaging body is shifted in the longitudinal direction so as not to match the bottom of the bag, which will serve as the opening for taking out the contents. Continue to fold it twice to form a triple fold, position the bottom opening of the main body at the fold of the triple fold, and surround this triple fold. It is characterized in that a patch paper with tampering tape that spans both outer walls of the main body is adhered to both outer walls to close it.

(Function) According to the paper bag of the present invention, one end side edge of the packaging body is bent once, and then the bag is folded twice in succession so as to wrap around this bent portion to form a triple folded portion. The opening at one end of the main body is located at the folded portion of this triple folded portion. In this way, when the opening at one end of the main body is located at the winding part of the triple folded part, the direction in which the opening at one end is directed is closed by the inner surface of the folded part, and as a result, the air flow from the opening at one end is prevented from flowing into the folded part. Large resistance is experienced by the inner surface of the bent portion. Therefore, when a shocking compressive force is applied to the outer wall surface of the paper bag, the pressure inside the folded part of the triple fold increases instantaneously, blocking the flow of air from the opening at one end. This prevents the contents inside from leaking.

(Example) Hereinafter, the paper bag of the present invention will be described in more detail with reference to the embodiment shown in the accompanying drawings.

FIG. 1 shows a paper bag 10 according to a first embodiment of the present invention. As is clear from FIGS. 1 and 2, this paper bag 10 has two pleated cylindrical bodies 11 and 12, an outer layer and an intermediate layer, both ends of which are cut in a straight line. The main body 14 includes a pleated cylindrical body 13 arranged as an inner layer. In this housing body 14, the stepped surfaces at both ends of each of the cylindrical bodies 11, 12 of the outer layer and the intermediate layer are formed so that the gaps therebetween are opposite to each other.

Originally, each of the cylindrical bodies of the packaging body constituting this type of paper bag has the same cutting dimension l, and each cylindrical body of the step-cut end is assembled so that a stepped surface appears at both ends. There is. In the paper bag 10 of this embodiment, the inner layer cylindrical body 13 having a straight cut end constituting the packaging body 14 has an opening side edge 13a.
is combined with another layer so as to be located longitudinally outward from the opening fold line 15 of the housing body I4 and substantially coincident with the mouth-side inward edge 11a of the outer layer cylindrical body 11. Inner layer cylindrical body 1
The reason why the opening side edge 13a of No. 3 is positioned outward in the longitudinal direction from the opening folding line 15 is that after filling the contents, the opening edge 13a is placed along the opening folding line 1
When it is folded and closed at step 5, a very large force will be applied to the folded part of the insert part along fold M15 due to internal pressure, resulting in insufficient strength and the back part may be torn. This is because it is necessary to position all the layers constituting the mounting body at the fold line portion. However, "full layer" as used herein does not necessarily mean that the wall surface must be included, but only that at least the covering part of that layer should be present.

This also applies to other embodiments described later.

Therefore, the bottom side edge 13b of the inner layer cylindrical body 13 comes out and is exposed at the opening of the step surface formed at the bottom side end of each of the outer layer cylindrical body 11 and the intermediate layer cylindrical body 12. It almost coincides with the bottom outer edge 11b of the shaped body 11.

The bottom side of the packaging body 14 serves as an opening for removing the contents after the paper bag 10 is filled with the contents, and is therefore closed to facilitate future opening. That is,
As shown in FIG. 3, the bottom closure 16 of the paper bag 10 is
The end portions of the outer layer cylindrical body 11 and the inner layer cylindrical body 13 protruding from the outer end m12b of the stepped surface of the outer layer and intermediate layer cylindrical bodies 11 and 12 are connected to the intermediate layer cylindrical body 12. is bent along a folding line 17 along the edge 12b of the outer layer cylindrical body 11, and then folded again along a second folding line 18 along the inward edge 11c of the outer layer cylindrical body 11 to the same folding side as the first fold, so as to wrap around this folded portion. Further, the entire layer is folded along the third fold line 19 so as to wrap around this folded part to form a triple folded part 20, and a cover paper 21 that straddles so as to surround this triple folded part 20. The paper 21 is closed by attaching each edge of the paper 21 to the outer wall surface with an adhesive 22. Note that a tape 23 for opening the seal, that is, tearing off the cover 21, is adhered to the inner surface of the cover 21 on the side where the folded portion is located.

The orientation of the fibers of this cover paper 21 is mainly
It is oriented in the 0-width direction. This means that generally the body 14 is formed continuously from a roll of paper, with the longitudinal direction (winding direction) of the body 14 being
4 corresponds to the longitudinal direction 0 Normally, the orientation of the fibers in the paper roll is mainly oriented in the winding direction. Even if the folded portion is surrounded, the orientation of the fibers is perpendicular to the stretching direction of the opening tape (width direction of the packaging body), so it cannot be easily torn. Therefore, the presence of the pad 21 as described above is extremely effective. In this case, by unrolling another paper roll and arranging the opening tape in the winding direction, and aligning the winding direction with the width direction of the main body, it is easy to arrange this kind of patch 21. Become.

The opening of the paper bag 100 with the bottom closed in this way is coated with a hot melt adhesive 24 that is reactivated by heat, similar to the closing part of a conventional step-cut paper bag, and after being filled with the contents, it is It is folded and pasted onto the outer wall of the main body 14 to be closed.

After the paper bag 10 of the embodiment configured as described above is filled with the contents from the mouth and the mouth is closed as described above, when taking out the contents from the paper bag 10, the bottom side of the paper bag 10 is opened. With the paper bag facing upward, pull up the opening tape 23 and tear the backing paper 21 in a straight line across the width.
The bent part of the O is stretched out to return to its original straight state, and the contents are taken out from the paper bag 10 using this part as an opening.

In this way, the cylindrical body 13 with a straight cut end is arranged as an inner layer inside the step-cut cylindrical body 11, 12, and the inner layer cylindrical body 13 is positioned in a so-called shifted state toward the bottom side, and the housing body is If the bottom end of the inner layer 14 is folded three times so as to be rolled up one after another and surrounded and fixed with the cover paper 21, the straight-cut end opening of the inner layer 13 will be located at the center of the folding of the triple folded part, As a result, the end opening is located in an extremely narrow space 25 as shown in FIG. raise it instantly. This prevents air from flowing out from the bottom end opening of the inner cylindrical body 13, thereby preventing leakage of the contents.

Further, the cylindrical bodies 11, 12, of each layer constituting the housing body 14.
13, in this embodiment, the inner layer cylindrical body 13 is shifted in the longitudinal direction with respect to other layers to the extent that it does not cause any problem to the function of the paper bag. The straight cut end of the cylindrical body can be bent three times without making the entire length of the inner cylindrical body particularly long, so the amount of paper used can be saved and an increase in manufacturing costs can be suppressed.

In the paper bag 10 of the first embodiment described above, the inner layer cylindrical body 13 whose both ends are straight-cut has its bottom edge 13b substantially aligned with the outer edge 11b of the outer layer cylindrical body 11. In this example, the inner layer cylindrical body 13 with straight cut ends is placed at a position similar to that of the packaging body 30 constituting the paper bag of the second embodiment shown in FIG. There may be. That is, in this housing body 30, the inner layer cylindrical body 13 having straight cuts at both ends has an edge 13b on the bottom side that is similar to the outer edge 11 of the outer layer cylindrical body 11 having a stepped end.
b and the outer edge 12b of the intermediate layer cylindrical body 12.

The bottom closure portion 31 of the paper bag of this second embodiment is formed as follows. The first bending at the bottom side end of the housing body 30 is performed by bending only the end portion having the outer edge 11b of the outer layer cylindrical body 11 along the fold line 17 along the edge 13b of the inner layer cylindrical body 13, and forming the inner layer cylindrical body 30. Wrap the end opening of the shaped body 13, then bend one side stepped surface of the inner layer cylindrical body 13, the intermediate layer cylindrical body 12, and one side stepped surface of the outer layer cylindrical body 11 along the fold line 18, and finally, that is, for the third time. Fold all layers along fold line 19. The thus formed three-layer folded portion 32 is surrounded and fixed with the backing paper 21 with the opening tape 23 attached, as explained in the first embodiment.

According to such a bottom closing part 31, the inner Fi cylindrical body 13
The number of times the end portion of the outer layer cylindrical body 11 is bent is two times.
The inner layer cylindrical body 13 is formed by first bending the outer step end of the inner layer 13.
Since the end opening is wrapped around and closed, the space 33 in the center of the winding where the end opening is located is narrower than the space 25 in the first embodiment, so that instantaneous leakage from the end opening is Even if there is only a small amount of air flowing out, the pressure within the space 33 will immediately rise, preventing any further air flowing out.

Therefore, the incidence of leakage of contents is further reduced.

In addition, in the paper bag according to the second embodiment, when the opening is closed, the fold
1115 is located further outward in the longitudinal direction than in the first embodiment. This is due to the fact that the inner layer cylindrical body 13 in the housing body 30 in FIG. 4 is moved upwardly in the housing body 14 in FIG. Therefore, the position of the broken line 15 has been changed accordingly. At this time, the inward stair edge ILa of the outer layer cylindrical body 11 is out of line with the fold line 15, but the bent mouth stair surface is fully bonded with the reactivated hot melt adhesive 24. Therefore, there are no problems with the closure of the opening in terms of strength and leakage.

The packaging body 40 constituting the paper bag according to the third embodiment shown in FIG. Normally, when all three layers of cylindrical bodies have step-cut ends, the edges of the cylindrical bodies of each layer are step-cut at the mouth and bottom of the main body. However, in the case of the paper bag of this embodiment, the outer layer cylindrical body 11 is shifted toward the bottom side in the longitudinal direction compared to the normal combination. placed in position.

That is, as shown in FIG. 6, the outer layer cylindrical body 11 with step-cut ends is cut to such an extent that the bottom end of the Okiseki layer cylindrical body 12 is hidden inside the outer layer cylindrical body 11 (therefore, naturally (The bottom end of the inner cylindrical body 41 is also hidden inside the outer cylindrical body)
It is shifted toward the bottom side in the longitudinal direction with respect to the cylindrical body of the other layer.

When folding the bottom of the packaging body 40 to form the bottom closing part 42 of the paper bag, first fold the step-cut end of the outer layer cylindrical body 110 in the packaging body 40 along the first fold line 17, and then Fold the entire layer along the second fold line 18 so as to wrap around this folded portion, and then fold the entire layer again along the third fold line 19 so as to wrap around this double folded portion to form a triple fold. A portion 43 is formed. After that, the backing paper 21 with the tear tape 23 that spans over this triple folded part 43 is applied, and each edge of the paper 21 is fixed to the outer wall surface with the adhesive 22 to form the bottom closing part. 42 is formed.

At the opening of the paper bag 40 with the bottom closed in this way,
An auxiliary flap 44 is attached to the back side (outer wall surface) of the stepped surface of the outer cylindrical body mouth portion of the housing body 40. The purpose of installing this auxiliary flap 44 is to completely close the mouth. That is, if this auxiliary flap 44 is not attached, when the end on the mouth side is bent along the fold line 15, one edge of the outer layer cylindrical body 11 will remain exposed on the back side of the step surface, and the middle layer will be exposed. The auxiliary flap 44 is required to prevent the outer layer cylindrical body 11 from being opened on one side. In other words, if such an auxiliary flap 44 is provided, the present invention can also be achieved by shifting the outer layer cylindrical body 11 with stepped cuts at both ends toward the bottom side with respect to the other layers, and folding the end portions so as to wrap them. Able to achieve purpose. That is,
As shown in FIG. 7, the bottom end of the outer layer cylindrical body 11, which is the bottom opening of the housing body 40, is located at the center of the folding of the triple-folded portion, and as a result, the end opening is extremely narrow. space 2
5, and the outlet side of the opening faces the inner circumferential surface of the bent portion, thereby preventing the contents from leaking as described above.

FIG. 8 shows a packaging body 50 constituting a paper bag according to a fourth embodiment of the present invention. This mounting body 50 is constructed by combining three layers of backed cylindrical bodies 51, 52, 53, each of which has a straight cut at both ends.
53 are offset from each other in the longitudinal direction so that their edges do not coincide, as is clear from FIG. That is, to describe the positions of the other layers with respect to the outer layer cylindrical body 53, the inner layer cylindrical body 51 has its opening side edge 51a further outward from the bag body than the edge 53a of the outer layer cylindrical body 53. protrudingly positioned;
Further, the middle layer cylindrical body 52 is positioned such that its opening side edge 52a is further inside the bag body than the edge 53a of the outer layer cylindrical body 53. As a result, at the bottom of the housing body 50, the edge 52b of the intermediate layer cylindrical body 52 is located furthest outward, followed by the edge 51b1 of the outer layer cylindrical body 51 and the edge 51b of the inner layer cylindrical body 51. Lined up in the longitudinal direction of the bag body.

The bottom closing portion 54 of the paper bag made of the packaging body 50 as described above is formed as follows. First, only the protruding end of the intermediate layer cylindrical body 52 at the bottom of the packaging body 50 is aligned with the first fold line 1.
7, then fold the outer layer cylindrical body 53 along the second fold line 18 so as to wrap around this folded portion, including the end portion of the outer layer cylindrical body 53, and further fold the outer layer cylindrical body 53 along the second fold line 18 so as to wrap around this folded portion. The triple folded portion 55 is formed by folding all the layers along the fold line 19 of No. 3. After that, this triple bent portion 55 is
It is fixed with a backing paper 21 in exactly the same way as in the embodiment.

Even if the main body 50 is made up of the straight-cut cylindrical bodies 51 to 53 in three layers, the bottom part can be bent three times to form a triple bent part as shown in FIG. 9, as described above. As shown in FIG. It faces the inner circumferential surface of the bent portion, which prevents leakage of the contents as described above. However, the main body 5
Even if the bottom part of the main body 50 is bent three times, the main body 50 shifts the cylindrical bodies 51 to 53 of each layer in the longitudinal direction and substantially expands the overall length, so it is difficult to cut each main body. There is no need to increase the dimensions and therefore the amount of paper used does not increase significantly.

In a paper bag made of such a packaging body 50, when closing the opening, the auxiliary flap 56 is attached to the outer layer cylindrical body 53 on the folded side of the bottom, as in the third embodiment shown in FIG.
It is glued to the outer wall surface to essentially form a staircase surface, and the end of the staircase on the mouth side is bent along the fold line 15 and glued with reactivated Hositomelt adhesive to completely close the mouth. .

In addition, FIGS. 2 to 9 showing the paper bags of each of the above-mentioned embodiments
In the figure, reference numeral 57 denotes an adhesive part (at intervals in the width direction of the main body) that adheres the outer layer and the inner adjacent layer to each other in order to increase the strength of the adhesive part at the position where the edge of the opening staircase is bent and adhered. In addition, reference numeral 58 indicates a bonded portion placed in a suitable position between each layer to join each layer.

(Effects of the Invention) As explained above, according to the paper bag of the present invention, the bottom closing part has a structure that is extremely easy to open when taking out the contents, but the contents are powder-like and This is an extremely superior paper bag that prevents the contents from leaking from the bottom opening of the packaging body even when an impactful pressure is applied to the outer wall surface, and also does not require a particular increase in the amount of paper used, so the manufacturing cost does not increase. can be provided.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a paper bag according to a first embodiment of the present invention, FIG. 2 is a schematic sectional view of a packaging body constituting the paper bag shown in FIG. - A schematic cross-sectional view showing the bottom closure of a paper bag taken along line ■, FIG.
FIG. 5 is a schematic cross-sectional view showing the bottom closing part of the paper bag according to the second embodiment, and FIG. A schematic cross-sectional view showing a packaging body constituting a paper bag according to a third embodiment.
The figure is a schematic cross-sectional view showing the bottom closing part of a paper bag according to the third embodiment, and FIG. 8 is a schematic cross-sectional view showing the packaging body forming the paper bag according to the fourth example of the present invention. FIG. 9 is a schematic sectional view showing the bottom closure of a paper bag according to the fourth embodiment, and FIGS. 10 and 11 are sectional views schematically showing the bottom closure of a conventional paper bag. . 10...Paper bag, 11.53...Outer layer cylindrical body, 12.
... Intermediate layer cylindrical body, 13,41.51... Inner layer cylindrical body, 14.30.40.50... Housing body, 16.314
2.54... Bottom closing part, 17... First fold line, 1
8...Second broken line, 19...Third broken line, 2032
．． 43.55...Triple folded part, 21...Packing paper,
23... tape for access, 25... space. Figure 1 Figure 2 Figure 4 Figure 8 Figure 10 Figure 11

Claims (1)

[Claims] A mounting body comprising a plurality of pleated cylindrical bodies, the end edge of at least one of the arbitrary cylindrical bodies being shifted in the longitudinal direction so as not to coincide with the edge of the other cylindrical bodies. Fold the edge of one end of the packaging body once in order to make one end the bottom of the bag which will be the opening for taking out the contents, then fold this folded part twice and triple-fold. for opening the packaging body, the bottom opening of the packaging body is located at the winding part of the triple-folded part, and the packaging body extends over both outer wall surfaces of the packaging body so as to surround the triple-folded part. A paper packaging characterized in that a tape-attached paper is adhered to both of the outer wall surfaces and closed.