JPH10258846A - Grain packaging bag, packaged grain, and method for fusionsealing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve daeration with constant air-permeability always secured and also to prevent rainwater or insects from entering a bag by forming a vent hole of such a size that grain may not leak with an unsealed part left for allowing difference between film lengths on both sides on a part of a fusion- sealed part. SOLUTION: When two films 3 wherein at least an internal face is made of thermoplastic synthetic resin is heat-compressed to fusion-seal, a thin rod-like metallic spacer is interposed between the surface and rear films 3, heat compression is performed from both sides by a pressurizing plate including a heater and an elastic pressurizing plate such as silicone rubber, and a vent part 5 is formed on a part of a fusion-sealed part 4 with an unsealed portion with one of the films swelling outward left. Thus even if the packaging bag 1 is filled with grain 2 and stretching force works lengthwise to the fusion-sealed part 4, excessive air in the bag can be reliably exhausted without crushing the vent part 5. In addition, since film ends 6 out of the fusion-seal 4 are normally in tight contact with each other, entrance rainwater or the like can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cereal packaging bag used for commercial packaging of cereals, mainly polished rice, cereals packaged by this packaging bag, and a fusion sealing method used for these.

[0002]

2. Description of the Related Art Various types of packaging bags for commercial use of polished rice have been proposed in the past. In order to enable degassing (air bleeding) from inside the bags after packaging, bags have been proposed. Many types in which a fine hole is provided are proposed. The conventional general structure of this degassable packaging bag is to form several holes of about 0.5 to 3 mm in the surface of the bag, or to form a 1 to 5 mm long hole in the heat-sealing seal portion at the periphery of the bag. Is formed by forming several unfused portions and degassing from the unfused portions.

[0003]

However, among the above-mentioned conventional methods, in the method of forming a small hole in the bag surface, when rain or the like is applied during transportation, rainwater easily enters the bag through the small hole, and food sanitation is required. There is a problem above. Further, in the method of forming an unfused portion in the seal portion and degassing therefrom, the conventional one has a structure in which the unfused portion is simply left at the time of the fusion seal, so that air is not removed. There is a difficulty that omission is bad. Because, in the conventional one, the film on both sides of the bag is sealed with the film on the front and back of the bag just flat, leaving the unfused part in the part. When closed, the air permeability becomes extremely poor. In addition, after packaging, the internal pressure generates a longitudinal extension force in the seal portion, so that both sides of the hole are further closed, making it almost impossible to deaerate. As a result, conventional packages cannot be stacked even as they are, making implementation difficult.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a grain packaging bag which is hardly penetrated by rainwater and the like and has excellent degassing performance. Further, the present invention is intended to provide a hygienic packaged cereal that is packaged using the above-mentioned packaging bag, is easy to carry, and is hygienic. Still another object of the present invention is to provide a fusion sealing method in which a sealing portion has a vent portion having good degassing property from the inside of the bag.

[0005]

Means for Solving the Problems The technical means of the grain packaging bag of the present invention is to leave a part of the fusion seal portion of the packaging bag made of a thermoplastic synthetic resin film at least inside unfused. A ventilation portion is formed, and a hole having a size that does not allow grain to leak is formed by providing a difference in the film length on both sides of the ventilation portion. Also, for packaging of polished rice, it is preferable that the shape of the hole of the ventilation section is 0.5 to 8 mm in length and 0.5 to 3 mm in bulge.

According to the technical means of the present invention, the grain is housed in a packaging bag made of a thermoplastic synthetic resin film at least on the inner surface, and a part of the fusion seal portion is left unfused in the packaging bag. In this way, a ventilation portion is formed, and the ventilation portion has a difference in film length on both sides to form a hole having a size that does not allow grain to leak.

The technical means of the fusion sealing method of the present invention is as follows.
When at least two films made of a thermoplastic synthetic resin are heat-pressed and sealed by fusion, a part of the seal part is left unfused to form a ventilation part, and the ventilation part is formed. Then, there is a difference in the film length between the front and back to form a hole having a size that does not allow grain to leak. Alternatively, the spacer may be interposed between the films and heated and pressed. Further, a hole may be provided in one pressurizing body, air may be taken in from the hole, and one film may be immersed and deformed in the hole at the time of heating and pressurizing.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. Numeral 1 denotes a packaging bag, which is in a sealed state after containing and packing a grain 2 such as polished rice. In the packaging bag 1 of the embodiment, since the shape of the material film 3 is tubular, both ends in the longitudinal direction are sealed 4 by heat fusion. When a bag is made by laminating films on the front and back, four turns are sealed. Material film 3 for bag 1
Any material can be used as long as at least the inner surface is a thermoplastic synthetic resin and can be heat-fused. In the embodiment, a composite film of a polyamide resin and a polyethylene resin is used. When using a composite film, it is sufficient that only the inner surface material can be fused, and the outer surface material may be non-fusible such as paper.

Reference numeral 5 denotes a ventilation portion, which is an unfused portion formed on the seal portion 4. In the embodiment, the ventilation portion 5 is provided only in one (upper in the drawing) seal portion 4. However, the ventilation portion 5 is provided in both upper and lower seal portions, or in the case of a 4-peripheral seal, on the left or right or 4 peripheral seal portions. Are also possible, and the number is also free. Details of the ventilation part 5 are shown in FIG.
As can be seen from the figure, there is a difference in the length of the film on the front and back sides in the ventilation section 5, and as a result, the longer film naturally swells outward, and a ventilation hole is formed in the inside. The length L of the ventilation part for packaging the polished rice is usually 0.1 mm.
5 to 8 mm, preferably 3 to 5 mm is appropriate, and the swelling amount H is 0.5 to 3 mm, preferably 1 to 1.5 mm.
mm is appropriate. If the hole is small, the deaeration is poor, and if the hole is large, the contents may leak, so it is appropriate to set the size, shape, number, etc. of the holes appropriately considering the size of the stored grain etc. Good.

As described above, in the ventilation part 5, there is a difference in the length of the front and back films, and a hole is formed independently. This hole is filled with rice in the bag, and the sealing part has a longitudinal extension force. Even if it acts, it does not collapse. For this reason, constant air permeability can always be secured, and surplus air in the bag is quickly and
Can be discharged reliably. The hole is provided in the seal portion, and the film end portion 6 exists outside the seal portion 4.
At this end 6, the front and back films are perfectly joined. For this reason, the air naturally opens when the air is discharged from the bag, but otherwise remains closed, so that air or the like hardly enters from the outside. Therefore, unlike a conventional bag provided with holes in the bag surface, even if rainwater or the like is applied to the bag, the bag does not enter the inside of the bag.

When the above-mentioned packaging bag is marketed as a bag alone, it is provided in a shape in which one edge is left open and a ventilation portion 5 is formed in the fusion sealing portion 4 on the other edge or the left and right side edges. . Then, a rice miller or the like who purchased the bag puts the polished rice in the bag and seals the open edge by fusion. The seal at this time may be a conventional complete seal, a conventional seal partially unfused, or a seal of the present invention. Moreover, what has been packaged in this way becomes the packaged grain of the present invention.

Next, the fusion sealing method will be described.
FIG. 3 shows a pressing operation state of the embodiment. 10
Is a pressure plate having a heater wire, 11 is another elastic pressure plate made of silicon rubber or the like, and 12 is a thin rod-shaped spacer made of metal or the like. That is, usually, both pressure plates 10,
The two films 11 and 11 are heated and pressurized from both sides to fuse the films 3 therebetween. In this embodiment, a spacer 12 is sandwiched between the two films. As a result, at the time of heating and pressing, the spacer 12
The film is not fused only at the portion where the exists, and if the spacer is removed after pressing, a hole is formed there. The size of the hole can be freely adjusted by changing the cross-sectional shape of the spacer 12. Since the spacer 12 is interposed therebetween, the portion expands only at that portion. However, since one pressure plate 11 is made of silicon rubber and has elasticity, such expansion is absorbed and the other portion is melted. There is no hindrance to wearing work. Further, the cross-sectional shape of the spacer 12 of the embodiment is trapezoidal, but other shapes such as a round shape and a square shape can be used.

FIG. 4 shows a fusion sealing method according to another embodiment. That is, the suction hole 15 is formed in one of the pressure plates 11.
Is opened, and an air suction device (not shown) is connected thereto, and air is suctioned from the hole 15 before the fusion seal. As a result, at the time of heating and pressurizing, one of the films 3 is immersed in the hole 15 as shown in the figure, so that only the portion is not fused and a hole is formed there. In the case where the ventilation portion 5 is formed by any of the embodiments shown in FIGS. 3 and 4, the swelling amount H of the ventilation portion 5 is small, and the length between the sealing portion 4 and the cut end of the film is a certain length. Therefore, the front and back films 3 are joined at the end 6 just as if the hands were joined together.

It should be noted that the present invention is not limited to the above embodiment, but can be freely implemented within the scope of the claims. In particular, the shape, size, number,
The formation location and the like can be freely adjusted according to the packaging situation. Further, the present invention can be used for packaging not only polished rice but also other cereals.

[0015]

According to the grain packaging bag of the present invention, a part of the fusion seal portion is unfused, and one of the films bulges outward to form a ventilation hole. Even if an extension force acts on the seal portion, the seal portion is not crushed, so that constant air permeability can be always secured, and the excess air in the bag can be quickly and reliably discharged. In addition, although the ventilation part is formed in the seal part, the end of the film extends out of the seal part, and here the film on the front and back is perfectly joined, so that the air in the bag is released. It opens naturally when draining, but remains closed at other times, making it difficult for air to enter the bag from the outside.As a result, compared to the conventional bag with holes formed in the bag surface, rainwater And insects are less likely to enter the bag.

According to the second aspect, the degassing property is sufficient, the rice does not leak, and it is extremely excellent for packaging of polished rice.

Since the packaged cereal of the present invention has good degassing property from the inside of the bag, it has good stability when the bags are stacked and does not cause collapse of the load. Further, even when rainwater or the like falls on the bag, water does not enter the bag, so that the stored grains are not degraded by water and are excellent in food hygiene.

According to the fusion sealing method of the present invention, it is possible to provide a simple and reliable seal by providing a vent portion having good degassing properties without using a large-scale apparatus.

Further, since the spacer according to the fifth aspect uses the spacer, a ventilation portion having a desired size can be formed easily and reliably. In addition, since a special configuration is not required for the pressurizing section, it can be carried out using the conventional apparatus as it is, and is highly practical.

The sixth aspect has an advantage that the work is easily automated since the air intake system is used.

[Brief description of the drawings]

FIG. 1 is a front view of an embodiment of a packaging bag of the present invention.

FIG. 2 is an enlarged sectional view of a ventilation section.

FIG. 3 is a sectional view showing one embodiment of a fusion sealing method.

FIG. 4 is a sectional view showing another embodiment of the fusion sealing method.

FIG. 5 is a perspective view of another embodiment of a packaged cereal.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Packaging bag 2 Grain contained 3 Packaging film 4 Sealing part 5 Ventilation part 6 End part 10, 11 Pressure plate 12 Spacer 15 Suction hole

[Procedure amendment]

[Submission date] November 10, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

As described above, in the ventilation part 5, there is a difference in the length of the front and back films, and a hole is formed independently. This hole is filled with rice in the bag, and the elongation tension in the longitudinal direction is applied to the seal part. Even if it acts, it does not collapse. For this reason, constant air permeability can always be secured, and surplus air in the bag is quickly and
Can be discharged reliably. The hole is provided in the seal portion, and the film end portion 6 exists outside the seal portion 4.
At this end 6, the front and back films are in perfect contact with each other. For this reason, the air naturally opens when the air is discharged from the bag, but otherwise remains closed, so that air or the like hardly enters from the outside. Therefore, unlike a conventional bag provided with holes in the bag surface, even if rainwater or the like is applied to the bag, the bag does not enter the inside of the bag.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction contents]

FIG. 4 shows a fusion sealing method according to another embodiment. That is, the suction hole 15 is formed in one of the pressure plates 11.
Is opened, and an air suction device (not shown) is connected thereto, and air is suctioned from the hole 15 before the fusion seal. As a result, at the time of heating and pressurizing, one of the films 3 is immersed in the hole 15 as shown in the figure, so that only the portion is not fused and a hole is formed there. In the case where the ventilation portion 5 is formed by any of the embodiments shown in FIGS. 3 and 4, the swelling amount H of the ventilation portion 5 is small, and the length between the sealing portion 4 and the cut end of the film is a certain length. because there is, front and back of the film 3 at the end portion 6 is just in the state in which contact has as combined hand.

Claims (6)

[Claims] 1. A ventilation portion is formed by leaving a part of a fusion seal portion of a packaging bag made of a thermoplastic synthetic resin film at least in an unfused state, and the ventilation portion has a double-sided film. A grain packaging bag with a difference in length to form a hole large enough to prevent grain leakage. 2. The shape of the hole of the ventilation part is 0.5 to 8 in length.
The grain packaging bag according to claim 1, wherein the swelling is 0.5 to 3 mm in mm and used for packaging milled rice. 3. A grain is accommodated in a packaging bag made of a thermoplastic synthetic resin film at least on the inner surface, and a ventilation portion is formed in the packaging bag by leaving a part of a fusion seal portion unfused. In this ventilated part, the packaging grain is formed with a hole that is large enough to prevent the grain from leaking by making the film lengths on both sides different. 4. A ventilation portion is formed by heat-pressing and sealing two films of at least the inner surface made of a thermoplastic synthetic resin, while leaving a part of the seal portion unfused. At the same time, a fusion-sealing method in which a hole having a size that does not allow grain to leak is formed by giving a difference between the front and back film lengths in the ventilation portion. 5. The fusion sealing method according to claim 4, wherein a spacer is interposed between the films at the portion where the ventilation portion is formed, and then the film is heated and pressurized. 6. The fusing method according to claim 4, wherein a hole is provided in a part of the pressing body on one side, and air is sucked from the hole to cause one of the films to be immersed and deformed in the hole during heating and pressing. Sealing method.