JP4145950B1 - Breathable bag for cereal encapsulation - Google Patents

Abstract

A breathable bag which does not impair the breathability in the handling process after enclosing cereals.
A breathable bag for encapsulating cereals is formed of a thermoplastic synthetic resin film. An inner seal line 11 and an outer seal line 12 extending in the lateral direction B parallel to each other are formed at the end edge 8 of the bag 1. The inner seal line 11 includes an inner weld portion 31 that is intermittently formed in the lateral direction B, and a breathable inner non-weld portion 32 that is formed between the inner weld portions 31. The inner non-welded portion 32 includes a first inner non-welded portion 32a that prevents passage of enclosed cereals and a second inner non-welded portion 32b that allows passage of cereals. The outer seal line 12 is on the outer side of the inner seal line 11, and has an air permeability formed between the outer weld portion 36 that is intermittently formed in the lateral direction B and the outer weld portion 36. And an outer non-welded portion 37 that prevents the passage of cereals.
[Selection] Figure 2

Description

  The present invention relates to a breathable bag capable of enclosing grains such as rice and wheat.

Conventionally, it has been well known that grains such as rice, wheat and corn are enclosed in a bag made of a thermoplastic synthetic resin film and distributed. A bag having a breathable seal line is conventionally known. For example, in a bag for cereal encapsulation disclosed in Japanese Patent Application Laid-Open No. 10-129680 (Patent Document 1), the overlapping films are welded together to extend between both side edges, in other words, parallel to each other extending in the lateral direction of the bag. A double seal line is formed. A seal line extending in the longitudinal direction of the bag is interposed between the seal lines. Each of the two seal lines includes a non-welded portion having a lateral dimension of 3 to 20 mm, and an air passage extending in the vertical direction of the bag is formed between the non-welded portion and the non-welded portion. ing. The rice bag provided with the hanging hole disclosed in Utility Model Registration No. 3132365 (Patent Document 2) has two inner and outer seal lines at the top of the bag, and a hanging hole is formed between the sealing lines. Has been. Each seal line is formed by intermittently arranging a large number of welding points and / or short welding lines in the width direction of the bag. In this bag, a ventilation path is formed by partially increasing the interval between the welding points, but the interval is suppressed to 6.5 mm or less in order to prevent leakage of rice.
Japanese Patent Laid-Open No. 10-129680 Utility Model Registration No. 3132365

  In the conventional bag, the width of the air passage is reduced or the width of the air passage is substantially reduced so that the leakage of rice grains from the air passage formed in the seal line can be prevented. A welding site is added in the vicinity of the air passage. However, in these bags, in the process of handling after the rice has been sealed, for example, in the process of being stacked on a pallet or arranged on a shelf, the end of the bag is bent along the seal line, and the air passage is substantially blocked. In some cases, the air inside the bag cannot be discharged. The bag in such a case is not preferable because the stacked state is unstable.

  Therefore, the present invention has an object to improve the conventional bag so as not to impair the air permeability of the bag in the process of handling the bag after enclosing the cereal.

  In order to solve the above-mentioned problems, the present invention is intended to be formed of overlapping thermoplastic synthetic resin films, which are formed by overlapping both side edges extending in the vertical direction in parallel with each other. It is a breathable bag for cereal encapsulating, having both end edges extending parallel to each other in the lateral direction, and a seal line is formed by welding the overlapping film to at least one of the both end edges. .

In this bag, the present invention is characterized as follows. The seal line includes at least two strips of an inner seal line and an outer seal line extending in the lateral direction. The inner seal line is closer to the inner side of the bag than the outer seal line in the longitudinal direction, and is formed between the inner weld portion formed intermittently in the lateral direction and the adjacent inner weld portions. And an inner non-welded portion that is formed. The inner non-welded portion allows the inside and outside of the bag to be ventilated and prevents passage of the enclosed cereal, and the inner non-welded portion allows the aeration and the plurality of grains arranged in the lateral direction. And a second inner non-welded portion that allows the passage of the first through second portions. The inner weld portion includes a first inner weld portion alternately arranged with the first inner non-weld portion in the lateral direction, and second inner weld portions formed on both sides of the second inner non-weld portion. The second inner welded portions facing each other via the second inner non-welded portion have a curved shape in which peripheral portions of mutually facing portions are convex with respect to the other side, and the outer sides in the longitudinal direction It extends longer than the said 1st inner side welding part so that a seal line may be approached. The outer seal line includes an outer weld portion formed intermittently in the lateral direction and an outer non-weld portion formed between the adjacent outer weld portions. The outer non-welded portion is formed so as to be able to vent the inside and outside of the bag and to prevent the passage of the cereal through the second inner non-welded portion toward the outer seal line. The distance between the inner seal line and the outer seal line in the longitudinal direction is formed so as to allow the plurality of grains to pass through the second inner non-welded portion.

  In one embodiment of the present invention, the cereal is rice, and the lateral dimension at the second inner non-welded portion is at least 20 mm.

In another one of the embodiments of the present invention, the cereal is rice, and in the lateral direction, the dimension of the first inner welded portion of the inner seal line is in the range of 1 to 10 mm, and the first inner The dimension of the non-welded portion is in the range of 0.5 to 5 mm, the dimension of the second inner non-welded portion is in the range of 20 to 80 mm, and the dimension of the outer non-welded portion of the outer seal line is 0.5. It is in the range of -5 mm.

In another embodiment of the present invention, the cereal is rice, and the distance between the first inner welded portion of the inner seal line and the outer welded portion of the outer seal line is 5 to 30 mm. Is in range.

In another embodiment of the present invention, the second inner weld portion approaches the outer seal line so as to prevent entry of the cereal between the inner seal line and the outer seal line. is doing.

In another preferred embodiment of the present invention, a finger insertion portion for using the one end edge portion as a handle is formed outside the outer seal line in the longitudinal direction to reinforce the finger insertion portion. The sheet pieces to be joined are joined to one of the overlapping films in the outer seal line and also in an additional seal line formed outside the finger insertion portion in the longitudinal direction.

In still another embodiment of the present invention, the second inner welded portion is formed in an elliptical shape or an oval shape.

The breathable bag according to the present invention has an air-permeable inner seal line and an outer seal line extending in the lateral direction in parallel to each other at at least one end edge portion. The inner seal line includes a second inner non-welded portion that allows passage of a plurality of grains arranged in the lateral direction, and the outer non-welded portion of the outer seal line is formed to prevent passage of the grain. Yes. Therefore, the cereals enclosed in the bag are prevented from passing toward the outer seal line at the inner welded portion and the first inner non-welded portion in the inner seal line, while there are a plurality of grains in the second inner non-welded portion. Grains can pass toward the outer seal line, and the passed cereals can form a group at and near the second inner unwelded portion. The group prevents the edge of the bag from being bent along the inner seal line, so the breathable bag according to the present invention has an effect of solving the problem that the bag is bent and the air permeability of the bag is impaired. Is obtained. Moreover, since the peripheral part of the 2nd inner side welding part formed so that it may mutually oppose on both sides of the 2nd inner side non-welding part has drawn the curve which becomes convex with respect to the other 2nd welding part, 2nd Even if a group of grains is formed in the inner non-welded part, the force acting on the peripheral part of the second inner welded part is dispersed by the group, and the bag is peeled off or torn at the peripheral part. Can be prevented.

  In the present invention in which the lateral dimension of the second inner non-welded portion is at least 20 mm, the effect becomes significant when the cereal is rice.

In the lateral direction of the bag, the dimension of the first inner welded part is 1 to 10 mm, the dimension of the first inner non-welded part is 0.5 to 5 mm, the dimension of the second inner non-welded part is 20 to 80 mm, and the outer non-welded part is In this invention of the form which has a size in the range of 0.5-5 mm, when grain is rice, the above-mentioned effect becomes still more remarkable.

In the invention in the form of an interval between the outer welding portion of the first inner weld portion and the outer seal line of the inner seal line within the range of 5 to 30 mm, and without unnecessarily increasing the size in the longitudinal direction of the bag The effect can be obtained.

  Other effects of the present invention will be described in the following description.

  The details of the cereal sealing bag according to the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a partially broken plan view of a breathable bag 1 made to enclose rice 40 as an example of grain 40 (see FIG. 3).

  The bag 1 is formed of a thermoplastic synthetic resin film that can be heat-welded, such as polyethylene, polypropylene, and polyester, and a vertical direction A and a horizontal direction B that are orthogonal to each other are indicated by double-headed arrows. The bag 1 is also made by welding a film formed in a tube shape in a flat state, and has a front surface portion 2 and a rear surface portion 3 that overlap each other. Has both side edges 6 and 7 extending in the vertical direction A, and both ends of the top edge 8 and the bottom edge 9 extending in the horizontal direction B at both ends of the vertical direction A. The front surface portion 2 and the rear surface portion 3 of the bag 1 are continuous at both side edge portions 6 and 7, and the inner edge of the top edge portion 8 is closer to the inside of the bag 1, and the inner seal line 11 is formed below the figure. It is formed in the upper part of the figure, which is closer to the outer side of the bag 1 than the inner seal line 11, and is welded to an outer seal line 12 parallel to the inner seal line 11, and is closed to allow ventilation. At the bottom edge portion 9, the front surface portion 2 and the rear surface portion 3 are in a separated state, and the rice 40 (see FIG. 3) is put into the bag 1 from the opening 10 formed by separating both the portions 2 and 3. Can be put. The bag 1 containing the rice 40 forms the bottom seal line 13 having an appropriate shape indicated by a phantom line on the bottom edge 9, for example, the same as the outer seal line 12, and closes the opening 10, thereby Can be encapsulated. Since the bag 1 has a pair of finger insertion portions 21 and 22 formed by slitting the overlapping front surface portion 2 and rear surface portion 3 above the outer seal line 12, the top edge portion 8 is gripped. Can be used as Such a bag 1 is preferably formed of a film that does not stretch in practice, and rice 40 is suitable for enclosing 2 to 10 kg.

FIG. 2 is an enlarged view of the top edge portion 8 of the bag 1. In the figure, the inner seal line 11 has an inner weld portion 31 that is formed intermittently in the lateral direction B, and an inner non-weld portion 32 that is formed between adjacent inner weld portions 31. The inside non-weld portion 32, a first inner non-weld portion 32a having a small size P ₁ in the transverse direction B, contains a second inner non-weld portion 32b having a larger dimension P ₂ in the transverse direction B Thus, both the first and second inner non-welded portions 32 a and 32 b form a ventilation path that communicates with the inside and outside of the bag 1. The inner weld portion 31 is formed in a spot shape and faces each other on both sides of the first inner weld portion 31a and the second inner non-weld portion 32b that are alternately arranged in the lateral direction B with the first inner non-weld portion 32a. And a second inner weld portion 31b formed as described above. Although the shape of the first inner welded portion 31a is not particularly specified, the first inner welded portion 31a is formed in a rectangle having a relatively small area in the illustrated example. The second inner welded portion 31b is a portion of the peripheral portion 43 facing each other across the second inner non-welded portion 32b so as to face the other party as formed in an elliptical shape or an oval shape in the illustrated example. It is preferable to draw a curve that is convex with respect to the opponent. The preferred second inner welded portion 31 b also extends longer than the first inner welded portion 31 a in the longitudinal direction A so as to approach the outer seal line 12.

  The outer seal line 12 includes an outer weld portion 36 that is intermittently formed in the lateral direction B, and an outer non-weld portion 37 that is formed between adjacent outer weld portions 36. The outer welded portion 36 does not particularly define its shape, but is formed in a substantially rectangular shape in the illustrated example. Each of the outer non-welded portions 37 has a dimension Q in the lateral direction B, and forms an air passage that leads to the inside and outside of the bag 1 in the outer seal line 12.

  Between the inner seal line 11 and the outer seal line 12, the first inner welded portion 31a and the outer welded portion 36 are separated by a dimension R, and the second inner welded portion 31b and the outer welded portion 36 are separated by a dimension S. is doing.

  In such a bag 1, even if the bottom seal line 13 formed on the bottom edge 9 is non-breathable, the air inside the bag 1 is allowed to flow between the first and second inner non-welded portions 32a and 32b. It can discharge | emit using at least one and the outer non-welding part 37. FIG.

FIG. 3 is a view similar to FIG. 2 in which rice 40 is put in the transparent bag 1 as cereal and a non-breathable bottom seal line 13 is formed on the bottom edge 9, and distributed to the top edge 8. The rice 40 is seen through. In the illustrated bag 1, the rice 40 is shown as being offset to one side in the lateral direction B of the bag 1 so that the first and second seal lines 11 and 12 can be clearly shown. In the following description, the rice 40 enclosed in the bag 1 in this way may be referred to as a rice grain 40. The top edge 8, is set dimension _{P 1} of the first inner non-weld portion 32a of the inner seal line 11 is sized to prevent passage of the rice grain 40, for example, 0.5 to 5 mm. The dimensional P ₂ of the second inner non-weld portion 32b, a plurality of rice grains 40 arranged in the transverse direction B is preferably 5 grains or more rice grains 40, more preferably substantially passes simultaneously rice grains 40 than 10 grains The size to be obtained is set to 20 to 80 mm, for example. The dimension Q of the outer non-welded portion 37 of the outer seal line 12 is set to a size that can prevent the passage of the rice grains 40, for example, 0.5 to 5 mm. Further, the separation dimension R between the inner seal line 11 and the outer seal line 12 is such that the rice grains 40 that have passed through the second inner non-welded portion 32b from the inside of the bag 1 are separated from the second inner non-welded portion 32b and the outer seal line 12. For example, a group 41 of about 20 grains or more can be formed between the two. However, the separation dimension S is such that the rice grains 40 forming the group 41 move in the lateral direction B between the second inner welded portion 31b and the outer welded portion 36, and the inner seal line 11 and the outer seal line 12 are moved. It is a dimension set in order to prevent entering between. The dimension is the same as or smaller than the separation dimension R, and can be set to 2 to 10 mm, for example.

  When the bag 1 is formed as described above and the inner seal line 11 is divided by the group 41 of rice grains 40 as shown in the illustrated example, the inner seal line is used when the bag 1 is transported or stacked. 11, the bag 1 is not bent at the imaginary line 39 (see FIG. 3), and the bag 1 is not sealed so as not to be exhausted in a substantial sense. However, the bag 1 is not such, and the inner seal line 11 is formed only by the first inner welded portion 31a and the first inner non-welded portion 32a, and does not have the second inner non-welded portion 32b. When the rice grains 40 enclosed are clogged just inside the inner seal line 11, the top edge portion 8 is easily bent at a virtual line 39 along the inner seal line 11, so that the bag 1 cannot be exhausted. May be. Such a state occurs in the longitudinal direction A of the bag 1, the portion above the inner seal line 11 is only a plastic film and easily deforms, but the portion below the inner seal line 11 is a plastic film. This is because the rice grains 40 are integrated and do not deform. In the present invention, the rice grains 40 form a group 41 in the second inner non-welded portion 32 b, thereby preventing the bag 1 from being bent at the virtual line 39.

  When the rice grain 40 forms the group 41 or when the bag 1 is held with the top edge 8 down and the bottom edge 9 up, the bag 1 is in the vicinity of the second inner non-welded portion 32b. Even if a high pressure acts on the front surface portion 2 and the rear surface portion 3 from the inside of the bag 1, the front surface portion 2 and the rear surface portion 3 are not peeled off or torn from the peripheral edge portion 43 of the second inner welded portion 31b. Must be a thing. For this purpose, the second inner welded portion 31b defines a curve in which the peripheral edge portion 43 is convex with respect to the other side of the second inner welded portion 31b facing each other via the second inner non-welded portion 32b. It is preferable. The second inner welded portion 31 b has such a peripheral edge 43, thereby dispersing the force to spread the second inner non-welded portion 32 b acting by the rice grains 40 in the lateral direction B over a wide range of the peripheral edge 43. Therefore, peeling and tearing at the peripheral edge 43 can be prevented.

In the bag 1, the outer non-weld portion 37 having a second inner non-weld portion 32b having a first inner non-weld portion 32a and the dimensions _{P 2} having dimensions _{P 1,} the dimension Q, the second inner weld portion 31b having a dimension S Whether or not the rice grain 40 can pass between the front surface portion 2 and the rear surface portion 3 in a portion between the outer weld portion 36 and the outer weld portion 36 is determined by these planar dimensions P ₁ and P ₂ shown in FIG. , Q, S alone is not determined. Degree of deformation of front surface portion 2 and rear surface portion 3 in a non-welded portion such as first inner non-welded portion 32a when front surface portion 2 and rear surface portion 3 of bag 1 are formed of a non-extensible film. This is because it is influenced by the welded portion formed in the vicinity of the non-welded portion. Therefore, the values of the dimensions P ₁ , P ₂ , Q, and S exemplified in the present invention are indicative, and the values actually adopted are the first and second inner welded portions 31 a and 31 b and the outer side of the bag 1. It is preferable to be determined based on conditions such as the specific arrangement of the welded portion 36, the stiffness of the film, and whether or not the film is non-extensible. In the present invention, when the rice grains 40 pass between the front surface portion 2 and the rear surface portion 3, the average particle size in the normal handling process assumed for the bag 1 in which the required amount of rice grains 40 is enclosed. This means that the rice grains 40 having the average particle size pass through, and it does not mean that the rice grains 40 having an average particle size pass when an abnormal force is applied. . Further, it does not mean that the rice grains 40 having a particle size much smaller than the average particle size mixed in the bag 1 pass through.

  In the case where the inner seal line 11 and the outer seal line 12 of the bag 1 are shaped as shown in the illustrated example, the dimension in the longitudinal direction A of the first inner weld portion 31a and the outer weld portion 36 is, for example, about 1 to 5 mm, and the lateral direction B The dimension can be set to about 1 to 10 mm, for example. The dimension in the longitudinal direction A of the second inner welded portion 31b is preferably adjusted so that the separation dimension S is the same as the separation dimension R or smaller than the separation dimension R to be 2 to 10 mm. When the capacity of the bag 1 is small and the inner seal line 11 and the outer seal line 12 are relatively close to each other and the separation dimension R is small, the separation dimension S may be set to the same value as the separation dimension R. Even in such a case, the peripheral portion 43 of the second inner welded portion 31b facing each other in the lateral direction B forms a curve that is convex toward the second inner welded portion 31b as the counterpart. Preferably it is. The welded portions 31a, 31b, and 36 in the illustrated example can be obtained by pressurizing the overlapped front surface portion 2 and rear surface portion 3 under heating, or can be obtained by performing ultrasonic welding processing. it can.

  FIG. 4 is a partially cutaway view similar to FIG. 2 showing an example of the embodiment of the present invention. The second inner weld portion 31b indicated by the phantom line in the inner seal line 11 is employed when it is desired to further reduce the separation dimension S between the second inner weld portion 31b and the outer weld portion 36 indicated by the solid line. Is illustrated. Further, the intermediate welded portion 45 formed between the second inner welded portion 31b and the outer welded portion 36 is separated from the elliptical second inner welded portion 31b or the virtual inner second welded portion 31b. It is an illustration of what was employ | adopted in order to adjust the dimension S. FIG. When the intermediate weld portion 45 is employed, the shape of the second inner weld portion 31b can be made the same as the shape of the first inner weld portion 31a. In the outer seal line 12, the adjacent outer welds 36 are formed in a state shifted in the vertical direction A. In such an outer seal line 12, an effect of facilitating the exhaust of the bag 1 by expanding the air passage in the bag 1 while preventing the passage of the rice grains 40 can be obtained. The bag 1 also has an additional breathable seal line 46 above the finger inserts 21,22. The additional seal line 46 is used to integrally join the front surface portion 2, the rear surface portion 3, and the reinforcing sheet piece 47 that overlap each other. The finger insertion portions 21, 22 are reinforced by a rectangular sheet piece 47 whose periphery overlaps the rear surface portion 3, and the sheet piece 47 is attached to the rear surface portion 3 in the outer seal line 12 in addition to the additional seal line 46. It is joined.

  This invention can also be implemented without forming the finger insertion portions 21 and 22. On the other hand, when the finger insertion portions 21 and 22 are formed, the top edge portion 8 becomes larger by that amount and is easily bent. However, the outer seal line 12 and the inner seal line 11 and the finger insertion portion as shown in the figure are used. By forming between 21 and 22, such a top edge portion 8 can also be made to have good air permeability. At this time, if the separation dimension R between the outer seal line 12 and the inner seal line 11 is set to about 10 to 30 mm, the bag 1 does not become larger due to the formation of the outer seal line 12. The bag 1 described using the rice 40 as an example can be used as a container for enclosing other grains. The dimension of each part of the bag 1 for that purpose can be determined according to what is enclosed.

  According to the present invention, it is possible to manufacture a bag having good air permeability for enclosing cereals.

The partially broken top view of a bag. The partial enlarged view of a bag. The same figure as FIG. 2 of the bag with which rice was enclosed. The figure similar to FIG. 2 which shows an example of embodiment.

Explanation of symbols

1 bag 6 side edge 7 side edge 8 end edge (top edge)
9 Edge (bottom edge)
DESCRIPTION OF SYMBOLS 11 Inner seal line 12 Outer seal line 21 Finger insertion part 22 Finger insertion part 31 Inner welding part 31a 1st inner welding part 31b 2nd inner welding part 32 Non-welding part 32a 1st non-welding part 32b 2nd non-welding part 36 Outside Welding part 37 Outside non-welding part 40 Grain 43 Peripheral part A Vertical direction B Horizontal direction R Spacing

Claims (7)

Formed of overlapping thermoplastic synthetic resin films, having both side edges extending in the longitudinal direction in parallel with each other, and both end edges extending in the lateral direction in parallel with each other on both side edges, An air-permeable bag for cereal encapsulation in which a seal line is formed by welding the overlapping film to at least one of both end edges,
The seal line includes at least two strips of an inner seal line and an outer seal line extending in the lateral direction;
The inner seal line is closer to the inner side of the bag than the outer seal line in the longitudinal direction, and is formed between the inner weld portion formed intermittently in the lateral direction and the adjacent inner weld portions. A first inner non-welded portion that allows the inside and outside of the bag to vent and prevents the passage of the encapsulated cereal, and allows the aeration. And a second inner non-welded portion that allows the plurality of grains arranged in the lateral direction to pass therethrough, wherein the inner weld portion is alternately arranged with the first inner non-welded portion in the lateral direction. The second inner welded portions facing each other via the second inner non-welded portion, the first inner welded portions being arranged and second inner welded portions formed on both sides of the second inner non-welded portion. , Peripheral edges of the parts facing each other There have Egai curve which is convex with respect to the other party, it extends longer than the first inner welded portion as in the vertical direction to approach to the outer seal line,
The outer seal line includes an outer weld portion that is intermittently formed in the lateral direction and an outer non-weld portion that is formed between adjacent outer weld portions, and the outer non-weld portion is The inside and outside of the bag can be ventilated, and the cereal can be prevented from passing through the second inner non-welded portion toward the outer seal line,
A distance between the inner seal line and the outer seal line in the longitudinal direction is formed so as to allow the plurality of grains to pass through the second inner non-welded portion. The bag.   The bag according to claim 1, wherein the cereal is rice, and the lateral dimension of the second inner non-welded portion is at least 20 mm. The cereal is rice, and in the transverse direction, the first inner welded portion of the inner seal line has a size of 1 to 10 mm, and the first inner non-welded portion has a size of 0.5 to 5 mm. The dimension of the said 2nd inner side non-welding part is in the range of 20-80 mm, and the dimension of the said outer side non-welding part of the said outer side seal line is in the range of 0.5-5 mm. Bag. The cereal is rice, and the distance between the first inner welded portion of the inner seal line and the outer welded portion of the outer seal line is in the range of 5 to 30 mm. The listed bag. Said second inner weld portion, in any one of claims 1 to 4 which is close to the outer seal line so that the can block entry of cereal into between the inner seal line and the outer seal line The listed bag. A finger insertion portion for using the one end edge portion as a handle is formed outside the outer seal line in the longitudinal direction, and the outer side with respect to one of the films on which sheet pieces that reinforce the finger insertion portion overlap. The bag according to any one of claims 1 to 5 , wherein the bag is bonded at a seal line and also bonded at an additional seal line formed outside the finger insertion portion in the longitudinal direction . The bag according to any one of claims 1 to 6, wherein the second inner weld portion is formed in an elliptical shape or an oval shape.

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