JP2017190170A - Valve bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve bag preventing a granular material from leaking, facilitating inserting a filling nozzle, and preventing application of manufacturing loads.SOLUTION: A valve bag has bottom walls, an inner patch and a nozzle insertion part. The valve bag is such that: a pair of outside folding bottom walls 15 and 16 are adhered to each other, are adhered to one inside folding bottom wall in a pair of inside folding bottom walls 17 and 18, and are not adhered to the other inside folding bottom wall; the inner patch 14 has an inner patch body and an inner patch folding part; the inner patch body is not adhered to the external surface of one inside folding bottom wall, is adhered to the external surface of the other inside folding bottom wall, and is adhered to the internal surfaces of the pair of outside folding bottom walls; the inner patch folding part is adhered to the internal surfaces of the pair of outside folding bottom walls; and the nozzle insertion part is formed from one inside folding bottom wall and the inner patch body.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a valve bag having a valve for filling powder particles such as wheat flour and cement.

  The valve bag into which powder such as wheat flour and cement is filled is filled with the powder through the nozzle, and thus has a nozzle insertion portion at the bottom. The valve bag into which such a granular material is put has a bottom wall formed by bending the opening end of the cylindrical body.

  In the present specification, the bottom wall is not limited to the bottom wall that becomes the lower side when the valve bag is arranged, and may be arranged in the other direction. The width refers to the thickness direction of the filled valve bag (in the drawing, the front and back direction on the both sides where the cylindrical body is crushed, and the vertical direction on the bottom of the cylindrical body developed in the drawing). The length refers to the width direction of the filled valve bag (in the drawing, the left and right direction on the both sides of the cylindrical body, the left and right direction on the bottom of the tubular body developed in the drawing). Show things. For the outside, the outside direction of the completed valve bag is shown as outside, and for the inside, the inside direction of the completed valve bag is shown as inside.

  As a prior art of such a valve bag, there are those disclosed in Patent Document 1 and Patent Document 2.

The valve bag of the prior art 1 disclosed in Patent Document 1 (a mode in the case where no block paper piece is provided) is manufactured as follows.
The upper part near the open end of the cylindrical body folded with the left and right side lines as mountain fold lines is folded at the first fold line parallel to the edge, and the left and right triangular folded parts are in a rectangular shape between them. An open portion is formed. Thereby, the opening edge part of a cylindrical body is expand | deployed by the hexagon shape formed by the part which folded right and left triangle shape, and the part opened rectangularly.
The width of the bottom wall of the valve bag is defined by the distance between a pair of second folding lines parallel to the edge. Glue is applied to the outer surface of the left side triangle-shaped folded part between the second folding lines and the part opened in a rectangular shape is pasted, and a valve in which both sides of the cylindrical body are folded and crushed is pasted. .
Thereafter, the inner patch is applied. The width of the inner patch is longer than the interval between the second folding lines, and the length is such that the left and right triangular folded portions and a part of the bulb are covered. Further, the glue is not attached to the portion surrounded by the second folding line of the opened portion.
The upper part of the open end of the expanded cylindrical body is folded at the second folding line on the upper side together with the inner patch, the trapezoidal folded part is glued on the inner surface, and the open end of the expanded cylindrical body is The lower part is similarly bent and glued.
For filling the valve bag with the powder particles, the filling nozzle is inserted into the valve, and the powder particles are filled through the opened portion on the inner surface side of the inner patch.

In the prior art 1 of Patent Document 1, since the inner patch attached to the folded portion of the triangular shape is folded together at the second folding line, the filled granular material is along the second folding line. It has a certain effect against leakage to the outside. However, there is a gap between the bent portion formed by folding and collapsing the cylindrical body on both sides in the width direction of the bulb, and the bent inner portion of the second folding line of the triangular folded portion facing it. May occur and leakage may occur along this portion.
In addition, since the valve and the inner patch are separate members, the number of parts increases, and problems such as an increase in manufacturing process and cost associated therewith may occur.

The valve bag of the prior art 2 disclosed in Patent Document 2 applies an inner patch provided with a cut hole in place of the valve and the inner patch of Prior Art 1 disclosed in Patent Document 1, and the valve bag is applied to the inner patch. This is a valve bag with added functions. The width of the cut hole is formed to be longer than the interval between the bag body folding lines. The manufacturing method of the valve bag of the prior art 2 disclosed by patent document 2 is as follows.
The opening end portion of the cylindrical body is developed into a hexagonal shape formed by the left and right triangular folded portions and the rectangular opening portion, glue is attached to a predetermined range, and the inner patch is attached. . The predetermined range to which the glue is applied is a portion where the inner patch overlaps, and is a range of the outer portion exceeding the bag body folding line and the left and right triangular folded portions. Moreover, glue cannot be attached to the inner part of the folded bag main body at the opened part. Furthermore, no glue is applied to the outer portion of the bag body folding line at the opened portion and facing the cut hole of the inner patch.
Glue is applied to a predetermined range, which is a range between the inner patch where the upper end portion of the opened opening end portion overlaps and the triangularly folded portion, and the portion on the right side of the cut hole. The upper portion of the opened end of the opening is folded at the upper bag body folding line, and the outer folding bottom wall is bonded.
Similarly, the lower portion of the opened end of the opening is also formed by bending the bag main body folding line so that the cut hole is not glued and bonding the outer folding bottom wall.
The valve bag is filled with the granular material by inserting a filling nozzle between the inside of the outer folding bottom wall and the outer surface of the left triangularly folded portion, and through the inner patch cut hole. Is filled.

  In the valve bag of the prior art 2 of Patent Document 2, the inner patch is attached to the outside of the bag body folding line and folded together with the outer folding bottom wall, so that the granular material is formed along the folding line of the bag body folding line. It can prevent leaking outside. In particular, on the side where the filling nozzle is inserted, since there is no valve like the valve bag of Prior Art 1 of Patent Document 1, there is a bent portion of the valve and the corresponding folded portion of the bag main body folding line. There is no leakage from the gap. Moreover, the number of parts can be reduced by providing the inner patch with a valve function.

Japanese Patent No. 3360800 JP-A-2015-193414

However, the valve bag of the prior art 2 disclosed in Patent Document 2 has the following problems.
In order to attach the inner patch to the bottom of the expanded cylindrical body, glue is applied to a predetermined range, but the range of the portion corresponding to the cut hole on the outside of the bag body folding line must be excluded, That work is a burden. In addition, when it is omitted or cannot be excluded accurately to exclude the gluing of the part corresponding to the cut hole, the outer folding bottom wall is connected to the upper and lower side parts of the bottom of the expanded cylindrical body through the cut hole. It will stick. In that case, when the filling nozzle is inserted to fill the granular material, the tip of the filling nozzle comes into contact with the adhered portion, which may cause an obstacle to insert the filling nozzle or the bag body may be broken. is there. In addition, the presence of the attached portion does not ensure the necessary opening area of the cut hole, which may impair the filling efficiency.

  When affixing the inner patch to the developed bottom, it is necessary to align the inner patch side folding line of the inner patch with the position of the bag body folding line. In that case, it is also necessary to align the positions of the cut holes and corresponding portions from which the glue is removed. In addition, it is necessary to align the both ends of the cut hole in the width direction so as to be outside the bag body folding line. These are matters to be considered especially when a manufacturing error occurs in the arrangement of the cut holes in the inner patch. In addition, when a manufacturing error occurs in the width dimension of the inner patch, the position of the cut hole may be changed, which is the same. For example, an inner patch manufactured by placing one end of the both ends in the width direction of the cut hole inside the inner patch side folding line due to a manufacturing error is pasted with the inner patch side folding line aligned with the bag body folding line. In this case, when the filling nozzle is inserted, the tip of the filling nozzle may be caught by one end of the cut hole, and the cut hole may be broken from that portion.

An inner patch is affixed to the left triangular folded portion where the filling nozzle is inserted, and a step is formed at the end of the inner patch by the thickness. When the filling nozzle is inserted between the inner surface of the outer folding bottom wall and the outer surface of the left triangle-shaped folded portion in order to fill the granular material, the tip of the filling nozzle may get caught in the step. is there. As a result, the inner patch and the left triangularly folded portion may be torn, the inner patch may come off, or the operation of inserting the nozzle itself may be hindered.
In addition, the right end portion in the length direction of the cut hole is attached to the outer folding bottom wall, and a step is generated by the thickness of the inner patch in this portion, and the filling nozzle is inserted. A similar problem can occur.
In addition, the problem that the tip of the filling nozzle is caught by the step as described above is the same for the valve provided at the folded portion of the left triangular shape in the valve bag of the prior art 1 of Patent Document 1. Can occur.

  Accordingly, an object of the present invention is to provide a valve bag that does not cause powder particle leakage, is easy to be filled by inserting a nozzle, and does not impose a burden on manufacturing, in view of the above-mentioned problems of the prior art. It is.

  The invention according to claim 1 of the present application is a valve bag having a bottom wall formed by bending an open end of a cylindrical body, an inner patch, and a nozzle insertion portion into which a filling nozzle can be inserted. The bottom wall includes a pair of inner folding bottom walls positioned relative to each other and a pair of outer folding bottom walls positioned opposite to the inner folding bottom wall, the outer folding bottom walls being The inner patch is bonded to one inner folding bottom wall of the pair of inner folding bottom walls and not bonded to the other inner folding bottom wall, and the inner patch is an inner patch. A main body, and an inner patch folded portion provided continuously through bent portions that are bent at both sides in the width direction of the inner patch main body, and the outside of the pair of inner folding bottom walls and the pair of outer folding bottoms. A pair of inner walls The inner patch body is disposed so as to overlap a part of both outer surfaces of the folding bottom wall, and the width of the inner patch body is the same as the distance between the folded portions of the pair of outer folding bottom walls, Is longer than the distance between the pair of inner folding bottom walls, and the inner patch body is not bonded to the outer surface of the one inner folding bottom wall, and the other inner folding bottom wall Bonded to the outer surface, bonded to the inner surface of the pair of outer folded bottom walls, the inner patch folded portion is bonded to the inner surface of the pair of outer folded bottom walls, the nozzle insertion portion, The valve bag is formed of the one inner folding bottom wall and the inner patch main body.

  The invention according to claim 2 of the present application is characterized in that the inner patch main body includes an inner patch closing portion, and an inner patch insertion bent piece continuously provided via the inner patch closing portion and the bending portion. The patch insertion folding piece is not bonded to the outer surface of the one inner folding bottom wall, and the nozzle insertion portion is formed by the one inner folding bottom wall and the inner patch insertion folding piece. The valve bag according to claim 1.

  The invention according to claim 3 of the present application is characterized in that the inner patch main body includes an inner patch closing portion, and an inner patch sealing bent piece continuously provided via the inner patch closing portion and the bending portion, The valve bag according to claim 1 or 2, wherein the inner patch-sealed folded piece is bonded to the outer surface of the other inner folding bottom wall.

  In the invention according to claim 4 of the present application, the inner patch insertion bent piece and / or the inner patch sealed bent piece is bent via a bent portion that is bent on both sides in the width direction of the inner patch body. 4. The valve bag according to claim 2, wherein a folded portion is provided continuously, and the folded piece folded portion is bonded to inner surfaces of the pair of outer folded bottom walls.

  In the invention according to claim 5 of the present application, the length of the inner patch insertion folded piece from the bent portion to the tip of the inner patch closed portion is the inner patch closed folded portion of the inner patch inserted folded portion. The valve bag according to claim 4, wherein the valve bag is longer than a length from the bent portion to the tip.

  The invention according to claim 6 of the present application is a hot melt capable of bonding the inner patch insertion bent piece and the inner patch closing portion to the outer surface of the inner patch insertion bent piece or the inner surface of the inner patch closing portion. The valve bag according to any one of claims 2 to 5, wherein an adhesive is provided.

  The invention according to claim 7 of the present application is capable of bonding the inner patch sealing bent piece and the inner patch closing portion to the outer surface of the inner patch sealing bent piece or the inner surface of the inner patch closing portion. The valve bag according to any one of claims 3 to 6, wherein a hot melt adhesive is provided.

  The invention according to claim 8 of the present application is a hot melt adhesive capable of bonding the inner patch folded portion and the folded piece folded portion to the outer surface of the inner patch folded portion or the inner surface of the folded piece folded portion. The valve bag according to any one of claims 4 to 7, wherein the valve bag is provided.

  With the configuration according to claims 1 to 8, it is possible to realize a valve bag that does not cause powder particle leakage, is easy to be filled by inserting a nozzle, and does not impose a burden on manufacturing.

It is explanatory drawing of the manufacturing process of the valve bag in embodiment of this invention. It is explanatory drawing of the manufacturing process of the valve bag in embodiment of this invention. It is explanatory drawing of the manufacturing process of the valve bag in embodiment of this invention. It is explanatory drawing of the inner patch of the valve bag in embodiment of this invention. It is explanatory drawing of the inner patch of the valve bag in embodiment of this invention.

Hereinafter, an embodiment of a valve bag of the present invention will be described with reference to the drawings.
While explaining the process of manufacturing the valve bag of the present invention, each configuration of the valve bag of the present invention will be described as appropriate.
The valve bag is manufactured by bending craft paper or the like into a tubular body.

  As shown in FIG. 1A, the left and right side lines 1 and 2 of the cylindrical body 50 are bent and crushed into a mountain fold line. As shown in FIG. 1 (b), the upper part of the open end of the cylindrical body 50 is bent along the valley fold line 3. At the same time, the mountain fold lines 4 and 5 are folded to form left and right triangular folded portions 9 and 10 and a rectangular opening 6 opened in a rectangular shape therebetween. Thereby, the opening end part of the cylindrical body 50 is developed into a hexagonal shape formed by the left and right triangular folding parts 9 and 10 and the rectangular opening part 6.

Of the opened opening end portion of the cylindrical body 50 shown in FIG. 1B, the trapezoidal portion in the paper surface direction from the valley fold line 3 is the opening end unfolding upper portion 7. Moreover, the opening end expansion | deployment lower part 8 is the part which carried out the trapezoid shape of the paper fold direction from the valley fold line 3 among the expansion | deployment opening edge parts of the cylindrical body 50 shown by FIG.1 (b).
As shown in FIG. 1 (b), a valley fold line is set in each of the open end unfolded upper portion 7 and the open end unfolded lower portion 8, and these are bent (the bent portion is the bottom wall forming bent portion 11, Thus, the outer folding bottom walls 15 and 16 which are trapezoidal outer bottom walls are formed. Further, of the left and right triangular folding portions 9 and 10, the inner base portion where the home base shape portion between the bottom wall forming bent portions 11 and 12 is located inside the outer folding bottom walls 15 and 16. These are the bottom walls 17 and 18. The outer folding bottom walls 15 and 16 are arranged so as to overlap the inner folding bottom walls 17 and 18.

As shown in FIG. 1 (c), in order to affix the inner patch 14, the U-shaped of the opening end unfolding upper portion 7 and the opening end unfolding lower portion 8 (left and right triangular folding portions 9, 10 and rectangular opening 6). An adhesive is applied to the predetermined range 21. A portion of the left inner folding bottom wall 17 covered by the inner patch 14 forms a nozzle insertion portion into which the filling nozzle is inserted, and thus an adhesive is not attached. Further, no adhesive is applied to the portion between the bottom wall forming bent portions 11 and 12 in the rectangular opening 6.
As shown in FIG. 2A, the inner patch 14 is affixed to the outside of the bottom wall forming bent portions 11 and 12 and covering a part of the left and right triangular folded portions 9 and 10.

The inner patch 14 to be attached will be described.
4A is a development view of the inner patch 14, and FIG. 4B is a perspective view of the inner patch 14.
The inner patch 14 has an inner patch main body and an inner patch folding portion. The inner patch body is composed of an inner patch blocking portion 14a and an inner patch insertion bent piece 14b. The inner patch folding part is composed of inner patch closing folded parts 14g, 14h and inner patch insertion folded piece folding parts 14i, 14j.
The inner patch insertion bent piece 14b is connected to the inner patch closing portion 14a through a width direction bent portion 14c bent by a mountain fold line in FIG.
The inner patch closed folded portions 14g and 14h are connected to both sides in the width direction of the inner patch closed portion 14a via length direction bent portions 14d and 14e which are bent by a valley fold line in FIG.
Inner patch insertion folded pieces 14i and 14j are connected to both sides of the inner patch insertion folded piece 14b in the width direction via lengthwise bent portions 14k and 14l that are bent by a mountain fold line in FIG. Has been.
The inner patch insertion folded-back portions 14i and 14j are also connected to the inner patch closed folded portions 14g and 14h via a width-direction folded portion 14c that is folded along a mountain fold line in FIG.
As shown in FIGS. 4A and 4B, a hot melt adhesive 14f is applied to a portion of the inner patch insertion bent piece 14b that overlaps the left inner folding bottom wall 17. The hot melt adhesive 14f is provided to seal the nozzle insertion portion between the inner patch insertion folded piece 14b and the left inner folding bottom wall 17 after the filling nozzle is inserted and the granular material is filled. .

FIG. 4B shows a state in which the inner patch insertion folded piece 14b and the inner patch insertion folded piece folding portions 14i, 14j are bent halfway along a mountain fold line that becomes the width direction folded portion 14c. The inner patch insertion folded piece 14b is bent until the inner patch closed folded portion 14a and the inner patch inserted folded piece folded portions 14i, 14j are folded over the inner patch closed folded portions 14g, 14h, respectively. The inner patch 14 is affixed to the opening end unfolding upper portion 7 and the opening end unfolding lower portion 8 with the inner patch insertion bent piece 14b facing the inner patch closing portion 14a. Thereafter, as shown in FIGS. 2 (c) and 3 (b), the inner patch closed folded portions 14 g and 14 h and the inner patch insertion folded piece folded portions 14 i and 14 j are bent together with the outer folded bottom walls 15 and 16. It is done.
The length from the width direction bent portion 14c to the tip of the inner patch insertion bent piece 14b may be a length that protrudes from the left inner folding bottom wall 17 when the inner patch 14 is attached. By doing so, a smooth filling operation can be performed at the time of filling the granular material, and the effect of preventing the backflow is further enhanced.

  As shown in FIGS. 1C and 2A, the inner patch 14 is attached so that the left inner folding bottom wall 17 and the inner patch insertion bent piece 14b are not bonded. The inner patch blocking portion 14 a is bonded to the outer surface of the right inner folding bottom wall 18. The inner patch closing folded portions 14g and 14h are bonded to the inner surfaces of the outer folded bottom walls 15 and 16 outside the valley fold lines of the bottom wall forming folded portions 11 and 12, respectively. A nozzle insertion part is comprised by the left inner folding bottom wall 17 and the inner patch insertion bending piece 14b.

When the inner patch 14 is affixed, it is necessary to align the position of the inner patch 14. At this time, the valley fold lines of the length direction bent portions 14 d and 14 e of the inner patch 14 are connected to the bottom wall forming bent portion 11, Overlay the 12 valley fold lines. All that is between the left inner folding bottom wall 17 and the inner patch insertion bent piece 14b and sandwiched between the bottom wall forming bent portions 11 and 12 is inserted into the nozzle only by performing such alignment. Part.
In the case where the notch hole is provided in the inner patch as in prior art 2, the notch hole must be aligned simultaneously with the alignment of the folding line of the inner patch. Compared to this case, the configuration of the present invention improves the working efficiency. Further, in the case where the incision hole is provided in the inner patch as in the prior art 2, when an error in the size of the incision hole or an error in the position of the incision hole provided in the inner patch occurs, for example, When the inner patch is manufactured by mistake so that one end in the width direction is inside the bent line of the inner patch, align the bent part of the inner patch with the bent part that forms the bottom wall. When the filling nozzle is inserted, one end of the punched hole remaining in the nozzle insertion portion comes into contact with the tip of the filling nozzle and the inner patch is broken. Such a problem can be avoided by using the present invention.

  As shown in FIG. 2B, an adhesive is applied to a predetermined range 22 of the inner patch blocking portion 14 a and the right inner folding bottom wall 18 that overlaps the outer folding bottom wall 15. Since the filling nozzle is inserted into the left inner folding bottom wall 17, no adhesive is applied to the portion overlapping the outer folding bottom wall 15. Also in this step, in the prior art 2, since the adhesive must be applied excluding the cut hole portion, the efficiency is improved.

As shown in FIG. 2 (c), the open end expanded upper portion 7 is bent at the valley fold line of the bottom wall forming bent portion 11 to form the outer folded bottom wall 15. The inner surface of the outer folding bottom wall 15 is bonded to the outer surface of the inner patch blocking portion 14 a and the outer surface of the right inner folding bottom wall 18.
When the opening end unfolding upper portion 7 is bent along the valley fold line of the bottom wall forming bent portion 11, the lengthwise bent portion 14d of the inner patch closing folded portion 14g is bent together. Therefore, it becomes difficult to produce a gap along the bottom wall forming bent portion 11, and leakage of the granular material can be prevented. Moreover, since the length direction bending part 14k of the inner patch insertion bending piece folding | returning part 14i is also bend | folded, the effect which prevents the leakage of a granular material further becomes large on the nozzle insertion part side.

  As shown in FIG. 3A, the adhesive is applied to a predetermined range 23 of the outer folding bottom wall 15, the inner patch blocking portion 14 a and the right inner folding bottom wall 18, which overlaps the outer folding bottom wall 16. Attached. Since the nozzle is inserted into the left inner folding bottom wall 17, no adhesive is applied to the portion overlapping the outer folding bottom wall 16. Also in this step, in the prior art 2, since the adhesive must be applied excluding the cut hole portion, the efficiency is improved.

As shown in FIG. 3 (b), the opening end unfolding lower portion 8 is bent along the valley fold line of the bottom wall forming bent portion 12 to form the outer folded bottom wall 16. The inner surface of the outer folding bottom wall 16 is bonded to the outer surface of the outer folding bottom wall 15, the outer surface of the inner patch blocking portion 14 a, and the outer surface of the right inner folding bottom wall 18.
When the opening end unfolding lower portion 8 is bent along the valley fold line of the bottom wall forming bent portion 12, the lengthwise bent portion 14e of the inner patch closing folded portion 14h is bent together. Therefore, it becomes difficult to produce a gap along the bottom wall forming bent portion 12, and leakage of the granular material can be prevented. Moreover, since the length direction bending part 141 of the inner patch insertion bending piece folding | returning part 14j is also bend | folded, the effect which prevents the leakage of a granular material further increases on the nozzle insertion part side.

  In the state shown in FIG. 3B, the bottom wall of the valve bag is formed, and then the valve bag is filled with the granular material by the filling nozzle. The filling nozzle is inserted into a nozzle insertion portion formed by the outer surface of the left inner folding bottom wall 17 and the inner surface of the inner patch insertion bent piece 14b. After filling with the granular material, the nozzle insertion portion is sealed as necessary. The sealing is performed by heating the hot melt adhesive 14f attached to the inner patch insertion bent piece 14b described above. Moreover, you may make it further cover the outer patch which is not shown in figure as needed.

  During or after filling, the lengthwise bent portions 14d and 14e of the inner patch closing folded portions 14g and 14h are both bent along the bottom wall forming bent portions 11 and 12, so that a gap is not easily generated. It is possible to prevent leakage of the granular material. Moreover, since the nozzle insertion part side is also bent together with the length direction bent parts 14k and 14l of the inner patch insertion bent piece folding parts 14i and 14j, the effect of preventing leakage of the granular material can be further increased. .

  The nozzle insertion portion for inserting the filling nozzle is formed by the outer surface of the left inner folding bottom wall 17 and the inner surface of the inner patch insertion folding piece 14b. The left inner folding bottom wall 17 includes the prior art 1 and the prior art. As shown in FIG. Therefore, when the filling nozzle is inserted, the tip of the nozzle does not come into contact with the step, and a smooth nozzle insertion operation can be performed.

  Since the inner patch insertion bent piece 14b is connected to the inner patch closing portion 14a via the width direction bent portion 14c, it is possible to prevent the filled powder from flowing backward from the nozzle insertion portion. it can. In addition, when the length of the inner patch insertion bent piece 14b is set so that the tip of the inner patch insertion bent piece 14b is positioned on the rectangular opening 6 side from the left inner folding bottom wall 17, While the backflow prevention effect is enhanced, it is also possible to obtain an effect of rectifying the flowing granular material when filling the granular material.

In order to bond the inner patch closing portion 14a and the inner patch insertion bent piece 14b after filling, a hot melt adhesive (not shown) is provided on the inner surface of the inner patch closing portion 14a or the outer surface of the inner patch insertion bent piece 14b. May be. By doing so, leakage of the powder after filling can be further prevented.
Also, hot melt bonding (not shown) is applied to the outer surface (when the valve bag is completed) of the inner patch closing folded portions 14g and 14h or the inner surface (when the valve bag is completed) of the inner patch insertion folded piece folded portions 14i and 14j. An agent may be provided. Even in that case, leakage of the powder after filling can be further prevented.

  In this embodiment, inner patch insertion folded pieces 14b are provided with inner patch insertion folded pieces 14i and 14j. However, the inner patch insertion folded piece folding portions 14i and 14j may not be provided. In this case, the inner patch insertion bent piece 14b is not restrained by the inner patch inserted bent piece folding portions 14i and 14j, and thus the function as a backflow prevention valve for the powder during filling is improved.

  FIG. 4C shows an inner patch 141 according to another embodiment of the present invention. The inner patch 141 has a configuration in which the inner patch insertion folded piece 14b and the inner patch insertion folded piece folding portions 14i and 14j of the inner patch 14 of the previous embodiment are omitted. The inner patch 141 includes an inner patch body of the inner patch closing portion 141a and inner patch folding portions of the inner patch closing folded portions 141g and 141h. The inner patch closed folded portions 141g and 141h are connected to each other on both sides in the width direction of the inner patch closed portion 141a via lengthwise bent portions 141d and 141e that are bent by valley fold lines. 141f is a hot-melt adhesive 141f provided inside the inner patch closing portion 141a to close the nozzle insertion portion after filling.

  The inner patch 141 is affixed to the predetermined range 21 in FIG. 1C in the same manner as the inner patch 14 of the previous embodiment, and the nozzle is inserted between the outer surface of the left inner folding bottom wall 17 and the inner surface of the inner patch blocking portion 141a. Forming part. If it is the inner patch 141 of this structure, it can be set as the valve bag which has a simpler nozzle insertion part.

FIG. 4D is an inner patch 142 according to another embodiment of the present invention. This inner patch 142 is provided with an inner patch sealing folded piece 142m via a folded portion on the opposite side of the inner patch insertion folded piece 14b of the inner patch blocking portion 14a of the inner patch 14 of the previous embodiment. Is. The inner patch 142 has an inner patch body and an inner patch folding portion. The inner patch body is composed of an inner patch blocking portion 142a, an inner patch insertion bent piece 142b, and an inner patch sealing bent piece 142m. The inner patch folding part includes inner patch closed folding parts 142g and 142h, inner patch insertion folded piece folding parts 142i and 142j, and inner patch sealing folded piece folding parts 142n and 142o.
The inner patch sealing bent piece 142m is connected to the inner patch closing portion 142a via a width direction bent portion that is bent by a mountain fold line.
Inner patch sealing folded piece folding portions 142n, 142o are connected to both sides of inner patch sealing folded piece 142m in the width direction via lengthwise folded portions 142p, 142q that are folded by valley fold lines.
The inner patch sealing folded-back portions 142n and 142o are also connected to the inner patch closing folded portions 142g and 142h via widthwise folded portions that are folded along a mountain fold line.

  The inner patch 142 is affixed to the predetermined range 21 in FIG. 1C in the same manner as the inner patch 14 of the previous embodiment, and the outer surface of the left inner folding bottom wall 17 and the inner surface of the inner patch insertion bent piece 142b are attached. A nozzle insertion part will be comprised. By providing the inner patch sealing folded piece 142m and the inner patch sealed folded piece 142n, 142o, it is possible to further prevent the powder particles from leaking on the opposite side of the nozzle insertion portion.

  As for the inner patch sealing folded piece 142m and the inner patch sealed folded piece folded portions 142n and 142o of the inner patch 142, as in the previous embodiment, the inner patch sealed bent portion 142a or the inner patch sealed folded portion 142a is folded. The outer surface of the piece 142m, and the outer surface (when the valve bag is completed) of the inner patch closing folded portions 142g and 142h or the inner surface (when the valve bag is completed) of the inner patch sealed folded folded portions 142n and 142o A hot melt adhesive (not shown) may be provided.

  4A, 4B, and 4D of the present embodiment, the inner patch insertion bent pieces 14b and 142b are provided on the inner patch closed portions 14a and 142a via the width direction bent portions 14c and 142c. However, it is also possible to provide the inner patch insertion folded pieces 14b, 142b at the tips thereof by winding the folded pieces inwardly via the bent portions. Leakage can be further prevented by providing folded portions on both sides in the width direction of the bent piece provided in the inner winding so that the outer folded bottom wall is folded at the same time. Such an inner winding folded piece and the folded portion may be applied to the inner patch sealing folded piece 142m of FIG.

  4 (a), 4 (b), and 4 (d) of the present embodiment, the inner patch insertion folded piece folding portions 14i, 14j, 142i, and 142j are bent from the width direction folded portions 14c and 142c to the inner patch insertion folded portions. Although it is provided over the entire length to the tip of the pieces 14b and 142b, it may be provided in a part as shown in the developed view of FIG. 5A and the perspective view of FIG. 5B. . In this case, the presence of the inner patch insertion folded piece folding portions 14i, 14j, 142i, 142j maintains the effect of preventing the leakage of the granular material, and the inner patch insertion folded pieces 14b, 142b Since there are portions that are not constrained by the folded-back portions 14i, 14j, 142i, and 142j, it is possible to have a function of preventing backflow and rectification of the granular material.

In this embodiment, the cylindrical body is crushed by both side lines, and the opening end portion is illustrated as a valve bag formed by developing it into a hexagonal shape with a triangular folding portion and a rectangular opening portion therebetween. That is, an embodiment in which the present invention is applied to a valve bag having a bottom portion constituted by a trapezoidal outer folding bottom wall and a home base inner folding bottom wall is described.
However, the present invention can also be applied to valve bags having other bottom walls. For example, even a valve bag having a bottom portion formed of a trapezoidal outer folding bottom wall and a rectangular inner folding bottom wall can be applied.
In addition, each technical matter in any embodiment may be applied to other embodiments as an example.

6 Rectangular opening 7 Open end expanded upper part 8 Open end expanded lower part 9 10, Triangular folded part 11, 12 Bottom wall forming bent part 14 Inner patch 15, 16 Outer folded bottom wall 17, 18 Inner folded bottom wall 14a Inner patch closed (Inner patch body)
14b Inner patch insertion folded piece (inner patch body)
14c Width direction bent part 14g, 14h Inner patch closed folded part (inner patch folded part)
14i, 14j Inner patch insertion folded piece folded part (inner patch folded part)

Claims (8)

A valve bag having a bottom wall formed by bending an opening end portion of a cylindrical body, an inner patch, and a nozzle insertion portion into which a filling nozzle can be inserted,
The bottom wall is
A pair of inner folded bottom walls positioned relative to each other, and a pair of outer folded bottom walls positioned opposite to and overlapped with the inner folded bottom wall,
The outer folding bottom wall is bonded to each other and is bonded to one inner folding bottom wall of the pair of inner folding bottom walls, and is not bonded to the other inner folding bottom wall,
The inner patch is
An inner patch main body, and an inner patch folded portion continuously provided via a bent portion that is bent on both sides in the width direction of the inner patch main body,
The outer side of the pair of inner folding bottom walls and the inner side of the pair of outer folding bottom walls, are arranged so as to overlap a part of the outer surface of both of the pair of inner folding bottom walls,
The width of the inner patch body is the same as the distance between the folded portions of the pair of outer folding bottom walls, and the length of the inner patch body is longer than the distance between the pair of inner folding bottom walls. ,
The inner patch body is not bonded to the outer surface of the one inner folding bottom wall, is bonded to the outer surface of the other inner folding bottom wall, and is bonded to the inner surfaces of the pair of outer folding bottom walls. And
The inner patch folding part is bonded to the inner surfaces of the pair of outer folding bottom walls,
The nozzle insertion part is
The valve bag is formed by the one inner folding bottom wall and the inner patch main body. The inner patch main body has an inner patch closing portion, and an inner patch insertion bent piece continuously provided through the inner patch closing portion and the bent portion,
The inner patch insertion folded piece is not bonded to the outer surface of the one inner folding bottom wall,
The nozzle insertion portion is
The valve bag according to claim 1, wherein the valve bag is formed by the one inner folding bottom wall and the inner patch insertion bent piece. The inner patch main body has an inner patch closing part, and an inner patch sealing bent piece continuously provided via the inner patch closing part and the bending part,
The valve bag according to claim 1 or 2, wherein the inner patch-sealed bent piece is bonded to an outer surface of the other inner folding bottom wall. The inner patch insertion folded piece or / and the inner patch sealed folded piece is provided with a folded piece folded portion continuously via a folded portion folded on both sides in the width direction of the inner patch body,
4. The valve bag according to claim 2, wherein the bent piece folding portion is bonded to inner surfaces of the pair of outer folding bottom walls. 5.   The length of the inner patch insertion folded piece from the bent portion to the tip with the inner patch closed portion is from the bent portion to the tip of the inner patch closed folded portion of the inner patch inserted folded portion. The valve bag according to claim 4, wherein the valve bag is longer than the length of the valve bag.   A hot melt adhesive capable of adhering the inner patch insertion bent piece and the inner patch blocking portion to the outer surface of the inner patch insertion bent piece or the inner surface of the inner patch closing portion is provided. The valve bag according to any one of claims 2 to 5, characterized in that   A hot melt adhesive capable of adhering the inner patch sealing bent piece and the inner patch closing portion to the outer surface of the inner patch sealing bent piece or the inner surface of the inner patch closing portion is provided. The valve bag according to any one of claims 3 to 6, characterized in that:   A hot melt adhesive capable of bonding the inner patch folded part and the folded piece folded part to the outer surface of the inner patch folded part or the inner surface of the folded piece folded part is provided. The valve bag according to any one of claims 4 to 7.

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