JPH09142488A - Paper bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To preclude the possibility of a leakage of contents by a method wherein matters to be stored can be filled by utilizing a tubular bulb and a strong mouth is provided. SOLUTION: A side wall 20 of a flat cylindrical body 3 is folded along a first lateral fold line 5 formed close to the end edge of an opening of the body 3 to form the opening, and a second lateral fold line 7 is formed on each side of the line 5, in parallel to the line 5, and a proximal end of a tubular bulb 13 is pasted to the outer surface of one side of the opening to interconnect the interior and exterior of the body 3 and both side edges of the bulb 13 are positioned inside the line 7. And the periphery of an inner supporting paper 9 for closing the opening 21 is pasted to the periphery of the opening 21 and the outer surface of the proximal end of the bulb 13 and adhesives are applied to the outside of the line 7 at an opened part of the side wall 20, and the side wall is folded inwardly from the line 7 so that an outer supporting paper 12 is pasted to the outer surface of the side wall.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper bag suitable for containing fine particles such as chemical substances, abrasives and grains.

[0002]

2. Description of the Related Art Conventionally, a hinge valve consisting of a valve tube and a folded leaf hinge is attached to a sewn or pleated portion at a corner of a partially folded terminal closing portion of a bag by means of a lower leaf of the valve. A paper bag that incorporates the hinged valve into the bottom fold of the bag by folding the side flaps along the fold lines that extend beyond the side edges of the tube to utilize the tube portion of the valve tube as the fill end. Is the real public sho 50
Proposed as No. -1450.

However, the thick and thick folds that are piled up in multiple layers are easily peeled off, and the folds are raised when the valve pipe is erected and the objects to be stored are filled, so that the folds are adhered when loading or transporting. There is a risk of peeling off the broken portion or causing backflow of the stored object during the filling operation to cause powder leakage.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a paper bag which can be filled with an object to be stored by using a tubular valve, has a strong mouth and is free from fear of leaking contents. .

[0005]

In order to achieve the above-mentioned object, the paper bag of the present invention has a first lateral fold line formed in parallel to the opening end edge of the flat tubular body, and the first lateral fold line is formed. The side wall of the tubular body is folded open from the line to form an opening, and two second horizontal folding lines parallel to the first horizontal folding line are formed on both sides of the first horizontal folding line. The proximal end portion of the tubular valve is attached, and the tubular valve communicates the inside and outside of the tubular body, and the tube side edges on both sides of the tubular valve are positioned inside the second lateral folding line to close the opening portion. The periphery of the internal force paper is attached to the peripheral edge of the opening portion and the outer surface of the base end portion of the tubular valve, and an adhesive is applied to the outside of the second horizontal folding line at the folded open portion of the side wall of the tubular body. At the same time, it is folded inward from the second horizontal folding line and external force paper is attached to the outer surface thereof.

[0006] With the bottom portion folded and adhered, the object to be stored is filled through the tubular valve. In addition, the double internal force paper and external force paper reinforce the bottom portion, and the internal force paper completely closes the opening portion to prevent powder leakage.

The tubular valve is composed of a piece of paper folded through a bending line intersecting the first horizontal folding line and a tube body having a base attached to the upper piece of the piece of paper, and the lower piece of the piece of paper is the above-mentioned piece. It is desirable that the bending line is placed inside and the tape is attached to the outer surface of one side of the opening. As a result, the lower piece and the upper piece of the paper piece can be rotated from the bending line to stand up at an angle at which the tube attached to the upper piece can be easily filled, and after the filling, the piece is laid down and placed in the bottom. Can be stored. Further, the paper piece of the tubular valve closes the gap between the internal force paper and the opening portion on both sides of the tubular body, and blocks the powder leakage from both sides of the base portion of the tubular body.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows the bottom of the paper bag 1, and FIGS. 2 and below show the manufacturing process of the paper bag 1. The paper bag 1 is manufactured in the following manner by a bag making device (not shown). First, FIG.
As shown in FIG. 5, a plurality of layers of rectangular base papers 2 are stacked and side edges of the base papers 2 are attached at positions different from each other to form a tubular body 3 having upper and lower openings. The material of the base paper 2 is appropriately selected according to the type of the stored items, and the number of stacked sheets can be changed depending on the weight of the stored items.

This tubular body 3 is sent from the bag feeder to the aligning section, aligned in the aligning section, and then transferred to the device with oblique lines. Hereinafter, the opening edge of the tubular body 3 on the filling side will be described. As shown in FIG. 3, the device with oblique lines scribes diagonal fold lines 4 symmetrically from both sides of the opening edge of the flattened cylindrical body 3 toward the slightly upper side edges thereof. It

Next, as shown in FIG. 4, by the first creasing device, a first horizontal folding line parallel to the opening edge is provided between the intersections of both side edges of the tubular body 3 and the diagonal folding line 4. 5 is formed.
Then, as shown in FIG. 5, the tubular body 3 is opened by the opening device.
The side walls 20, 20 are folded outward from the first lateral folding line 5, and both sides of the side walls 20, 20 are folded along the diagonal folding line 4. As a result, the opening portion 21 surrounded by the opening edge is formed, and the triangular folding portions 6 are formed on both sides of the opening portion 21.

Next, as shown in FIG. 6, two second horizontal folding lines 7, 7 parallel to the first horizontal folding line 5 are formed from the first horizontal folding line 5 by the second creasing device. Formed at intervals. The second lateral folding lines 7 and 7 are formed with a specified width so as to be located slightly outside both side edges of the tubular body 14 of the tubular valve 13 described later.

The tubular valve 1 is provided on the outer surface of one side of the opening portion 21.
The base end of 3 is attached. The tubular valve 13 is made of the same or the same type of paper as the base paper 2, and as shown in FIG. 7, a rectangular paper piece 16 folded along a bending line 15 at the center of the width direction and an upper piece 17 of the paper piece 16. And a tube body 14 having a base attached to the outer surface of the. The tube body 14 is formed to have a diameter corresponding to the thickness of the supply nozzle of the object to be stored and a length corresponding to the size of the supply nozzle. The width of the tubular body 14 when folded flat is slightly narrower than the distance between the second lateral folding lines 7, 7. The length of the paper piece 16 is longer than the width of the flat tube body 14.

In order to attach the tubular valve 13 to one side of the opening portion 21, first, as shown in FIG. 8, the paper piece 16 is attached to the outer surface of the inner end portion of the folding portion 6 via the lower piece 18 thereof. . Next, as shown in FIG. 9, the tube body 14 is attached to the central portion of the upper piece 17 of the paper piece 16. At this time, the paper piece 16 is arranged so that the bending line 15 faces inward, and the tube body 14 is arranged so that the base end edge of the tube body 14 and the bending line 15 coincide with each other. As a result, the inside and outside of the tubular body 3 are communicated with each other by the tubular body 14.

Further, as shown in FIG. 10, the inner end of the folding portion 6, the outer side of the second lateral folding line 7, and the tubular valve 13 are provided.
The hatched portion on the outer surface of the base end portion of is the annular attachment portion 8. Then, as shown in FIG. 11, the internal force paper sticking device applies an adhesive to the portion of the internal force paper 9 having the same shape as the outer shape of the sticking portion 8 or a slightly larger rectangular shape, which corresponds to the sticking portion 8. It is attached to the outer surface of the attachment part 8. This internal paper 9
Is composed of a sheet of paper of the same or similar material as the base paper 2.

Next, as shown in FIG. 12, an adhesive is applied by a bottom gluing device to the portions of the side wall 20 of the tubular body 3 which are opened and folded and which are outside the second lateral folding lines 7, 7. To be done. After that, as shown in FIG. 13, the molding plate folds the parts outside the second lateral folding lines 7, 7 to which the adhesive has been applied, inwardly, so that they are on each other and on the internal force paper 9 and the folding part 6. It will be attached to.

External force paper 12 is attached to the outer surface of the bottom which is folded and attached as described above, as shown in FIG. The external force paper 12 has a rectangular shape slightly narrower than the interval between the second horizontal folding lines 7 and slightly longer than the second horizontal folding line 7. When it is necessary to print the product name, the unsealing method, or the like on the outer surface of the external force paper 12, it is further transferred to the printing unit and the display is printed appropriately.

The paper bag 1 having the bottom portion is pressed by the pressing device, counted by the counting stack device, and discharged from the bag making device. The paper bag 1 discharged from the bag-making apparatus is put into a metal detector to confirm the presence of metal, is inspected and packed, and is sent to a packing line.

The tip of the tubular body 14 may be simply flatly pressed and closed after the object to be stored is put in, or may be adhered by heat sealing or the like. Further, since the other opening edge of the tubular body 3 is not used for throwing in the object to be stored, the internal force paper 9 and the external force similar to the opening edge on the filling side can be obtained without mounting the tubular valve 13. Paper 12
To be blocked. At this time, the internal force paper 9 and the external force paper 12
It is easy to open by attaching a cut tape to each.

[0019]

According to the paper bag of the first aspect of the present invention, since the object to be stored can be filled through the tubular valve in a state where the mouth portion is folded and adhered, not only the filling work can be performed very efficiently but also the internal force paper and Since the mouth is double reinforced with external force paper, it is extremely strong. In addition, since the opening is completely blocked by the internal force paper, shock is applied during loading, transportation, etc., and the part of the tubular body that is folded and pasted peels off, or the tubular valve is filled during filling. Even if the bulge rises and the bottom part floats up, there is no concern that the stored items stored inside will leak out.

According to the paper bag of the second aspect, the tube can be erected at an angle at which the tube can be easily filled, and the filling operation is further facilitated. After the completion of the filling, the tube can be laid down and folded into the bottom. Therefore, the tubular valve does not get in the way. In addition, since the paper piece forming a part of the tubular valve closes the gap between the opening portion on both sides of the tubular body and the internal force paper, the fine powder that floats up inside the bag when the object to be stored is filled with the pressure inside the bag. As it rises, it will not blow out from both sides of the tube and will not leak outside the bag.

[Brief description of the drawings]

FIG. 1 is a partially cutaway plan view of a bottom portion of a paper bag showing an embodiment of the present invention.

FIG. 2 is a plan view showing a first step of the manufacturing process of the paper bag.

FIG. 3 is a plan view showing a second step of the manufacturing process of the paper bag.

FIG. 4 is a plan view showing a third step of the manufacturing process of the paper bag.

FIG. 5 is a plan view showing a fourth step of the manufacturing process of the paper bag.

FIG. 6 is a plan view showing a fifth step of the manufacturing process of the paper bag.

FIG. 7 is a perspective view of a tubular valve.

FIG. 8 is a plan view showing a sixth step of the manufacturing process of the paper bag.

FIG. 9 is a plan view showing a seventh step of the manufacturing process of the paper bag.

FIG. 10 is a plan view showing an eighth step of manufacturing the paper bag.

FIG. 11 is a plan view showing a ninth step of manufacturing the paper bag.

FIG. 12 is a plan view showing a tenth step of the manufacturing process of the paper bag.

FIG. 13 is a plan view showing an eleventh step of manufacturing the paper bag.

FIG. 14 is a plan view showing a twelfth step of the manufacturing process of the paper bag.

[Explanation of symbols]

 1 Paper bag 2 Base paper 3 Cylindrical body 4 Diagonal folding line 5 First horizontal folding line 6 Folding part 7 Second horizontal folding line 8 Adhesion part 9 Internal force paper 12 External force paper 13 Tubular valve 14 Tube body 15 Bending line 16 Paper piece 17 Top Piece 18 Lower piece 20 Side wall 21 Opening part

[Procedure amendment]

[Submission date] December 26, 1995

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Fig. 5

[Correction method] Change

[Correction contents]

[Figure 5]

[Procedure amendment 2]

[Document name to be amended] Drawing

[Name of item to be corrected] Fig. 10

[Correction method] Change

[Correction contents]

FIG. 10

Claims (2)

[Claims] 1. A first horizontal folding line is formed near the opening edge of the flat tubular body in parallel with the opening end edge, and a side wall of the tubular body is folded open from the first horizontal folding line to form an opening portion. , Two parallel second horizontal folding lines are formed on both sides of the first horizontal folding line, and the proximal end portion of the tubular valve is attached to the outer surface of one side of the opening, and the tubular valve The inside and the outside of the tubular body are communicated with each other, the tube side edges on both sides of the tubular valve are located inside the second lateral folding line, and the periphery of the internal force paper that closes the opening portion is surrounded by the peripheral edge of the opening portion and the base end of the tubular valve. The adhesive is applied to the outer surface of the tubular body, the adhesive is applied to the outside of the second horizontal folding line at the folded and opened portion of the side wall of the tubular body, and the second lateral folding line is folded inward to apply external force to the outer surface. A paper bag characterized by sticking paper. 2. The tubular valve comprises a piece of paper folded through a bending line intersecting the first horizontal folding line, and a tube body having a base adhered to an upper piece of the piece of paper, and a bottom portion of the piece of paper. The paper bag according to claim 1, wherein the piece is attached to the outer surface of the one side portion of the opening portion with the bending line inside.