JP2006076609A - Food storage bag, raw-fabric film for food storage bag, and manufacturing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a food storage bag inexpensively manufacturable, capable of surely discharging internal gas, and preventing a flavoring ingredient from being lost due to communication with open air. <P>SOLUTION: In the storage bag capable of storing and hermetically sealing food, a film forming the bag is a laminate film composed of an internal film and an external film bonded to each other. A vent enabling air to flow is formed between the internal and external films by leaving a partially unbonded part. A vent pore capable of venting through the inside of the storage bag is formed on the internal film in the vent, and a discharge port capable of communicating with the open air is formed on the external film. When the food discharges gas in the storage bag, the gas is emitted from the discharge port 5 via the vent 4 through the vent pore 6 of the internal film 12, so that internal pressure does not rise and the storage bag does not expand. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a food storage bag, a raw film for a food storage bag, and an apparatus for manufacturing a raw film for a food storage bag. More specifically, foods such as coffee beans, raw miso, and fruits generate gas due to the progress of fermentation and respiratory action, but the storage bag expands even when the internal pressure increases due to the gas produced by such stored food. The present invention relates to a food storage bag that is not excessively ruptured or ruptured, and a raw film and a manufacturing apparatus for manufacturing the food storage bag.

Conventionally, a degassing valve is attached to a storage bag so that the storage bag does not expand or burst due to gas filling (Patent Document 1).
This degassing valve has a structure that provides a check valve function by providing a ventilation part and a valve part, since external air should not be allowed to flow in even if the gas with high gas pressure inside the bag is extracted. ing. For this reason, since the gas vent valve cannot be formed integrally with the storage bag, the gas vent valve is welded and attached after the storage bag is formed. It became complicated and the unit price of the storage bag was high.

Japanese Patent Publication No.5-79567

  In view of the above circumstances, the present invention is a food storage bag that can be manufactured at low cost, and the internal gas is surely released and does not lose aroma components due to communication with the outside air, a raw film for the food storage bag, and food storage It aims at providing the manufacturing apparatus of the raw film for bags.

The food storage bag of the first invention is a storage bag capable of storing and sealing food, wherein the film forming the storage bag is a laminated film in which an inner film and an outer film are bonded together, Between the inner film and the outer film of the laminated film, a ventilation part that allows air to flow without being partially bonded is formed, and in the ventilation part, the inner film is ventilated with the inside of the storage bag. A hole is formed, and an exhaust port capable of communicating with outside air is formed in the outer film.
The food storage bag of the second invention is characterized in that, in the first invention, the ventilation pores in the ventilation part are cuts formed in the inner film.
A food storage bag according to a third invention is the food storage bag according to the first invention, wherein the ventilation portion is provided on the surface of the storage bag so as to have a predetermined width linearly from one end to the other end of the storage bag, The exhaust port is open at both ends of the ventilation portion.
The raw film for a food storage bag according to the fourth invention is a laminated film in which an inner film and an outer film are adhered to each other, and air is not partially adhered between the inner film and the outer film of the laminated film. A ventilation portion that enables the circulation of the inside of the storage bag is formed in the inside portion of the ventilation film.
According to a fifth aspect of the present invention, there is provided an apparatus for producing a film bag for a food storage bag using a drum cutter comprising a drum that is driven to rotate and blades that are mounted at equal intervals in the circumferential direction on the outer surface of the drum. In the state where the original film according to claim 4 is wound, the drum cutter is rotated and the original film is run.

According to the first invention, when the food in the storage bag releases gas, the gas is released from the exhaust port through the ventilation hole through the ventilation pores of the inner film, so that the internal pressure does not increase and the storage bag expands. do not do. Further, in a normal state, the inner film and the outer film are in contact with each other to prevent the natural passage of air, so that the fragrance component does not escape. Since this storage bag does not use an external check valve or the like, the number of parts is small and the number of manufacturing steps is small, so that the storage bag can be manufactured at low cost.
According to the second invention, since the ventilation pores are cut, they are closed in a normal state and do not circulate with the outside air, so that the effect of preventing the loss of aroma components is high. Moreover, since the cut opens when the internal pressure increases, the gas can be released sufficiently.
According to the third invention, since the ventilation portion is formed in a tunnel shape from one end to the other end of the storage bag, the flow path until it comes into contact with the outside air becomes long, and as a result, the loss of the fragrance component normally occurs. Highly effective in prevention. However, when the internal pressure is high, since it can be released to the outside air even through the tunnel-like ventilation part, the degassing effect is sufficient.
According to the fourth invention, since the ventilation portion and the ventilation pores are formed in advance in the raw film, the laminated film is formed with the inner film inside, and the exhaust port is formed at an arbitrary portion of the ventilation portion. By simply doing, the food storage bag of the first invention can be efficiently manufactured. Moreover, if it is a food storage bag of 3rd invention, since an exhaust port can be simultaneously made only by making a bag, productivity will become higher.
According to the fifth invention, when the original film according to claim 4 is wound around the drum cutter and rotated with the drum cutter, the blade enters the original film while running the original film. Since the cuts can be made at equal intervals, the raw film for the food storage bag of the present invention can be produced efficiently.

Below, the storage bag which concerns on embodiment of this invention is demonstrated based on drawing.
FIG. 1 is a perspective view of a food storage bag according to an embodiment of the present invention. 2 is a cross-sectional view of the food storage bag of FIG. FIG. 3 is an enlarged cross-sectional view of the ventilation portion. FIG. 4 is an explanatory diagram of the food storage bag in use.

  The basic structure of the storage bag A to which the present invention is applied will be described with reference to FIGS. The storage bag A is formed into a cylindrical shape by bonding at the central bonding portion 1 where both edges of one film are aligned, the upper end edge of the cylindrical shape is bonded at the upper end bonding portion 2, and the lower end edge is bonded at the lower end bonding portion 3. It is the one that is further bonded with. The shape of the storage bag A as described above is not limited to this, and includes various forms such as a gusset bag (a bag with a gusset) and a three-sided bag.

The film constituting the storage bag A is composed of an inner film 12 and an outer film 11. The inner film 12 itself may be a single layer film or a laminated film. Further, the outer film 11 itself may be a single layer film or a laminated film.
The inner film 12 and the outer film 11 are basically used by being laminated on the entire surface. However, in the ventilation part 4 characterized by the present invention, the inner film 12 and the outer film 11 are not bonded to each other, and are formed in a tunnel shape through which air flows.
In the embodiment of FIG. 1, the ventilation portion 4 is formed from the upper end to the lower end of the storage bag A. However, the ventilation portion 4 may be partially formed instead of from the end to the end.

The structure of the ventilation part 4 will be described in more detail.
Exhaust ports 5 and 5 are formed at both ends of the ventilation portion 4. However, the exhaust ports 5 and 5 are not always kept open, and are naturally blocked when the inner film 12 and the outer film 11 of the ventilation portion 4 are in contact with each other. When the inner film 12 and the outer film 11 in the ventilation part 4 are separated from each other, for example, when gas passes, they naturally open.

Venting pores 6 are formed in the inner film 12 in the ventilation portion 4 in some places. The vent hole 6 may be a small opening because it needs only to be opened slightly to allow gas to pass when the gas pressure in the storage bag A increases. On the other hand, if it is too large, the aroma component of the stored food escapes, which is not preferable.
In the present embodiment, the ventilation pores 6 are formed by slits cut with a blade.
Further, two ventilation pores 6 formed by the cuts are provided in parallel as shown in FIG. The reason why these two ventilation pores 6 (hereinafter sometimes referred to as cuts 6) are provided in parallel is as follows.
Since the cut 6 has a narrow width, if there is only one cut, the cut 6 may not be sufficiently open, resulting in incomplete gas venting. On the other hand, when two cuts are arranged in parallel, even when the gaps between the individual cuts 6 are small with the inner film 12 being flat as shown in FIG. Also, as shown in FIG. (B), when the inner film 12 bends irregularly, the inner film 12 is easily bent at at least one of the two cuts 6, so that the gas is cut from the cuts 6 that are bent and the gap is widened. It becomes easier to pass.

Based on FIG. 4, the use condition of the food storage bag A of this embodiment is demonstrated.
In the illustrated food storage bag A, foods that generate gas such as coffee beans and raw miso are placed and swelled to some extent (however, the food is not shown).
In this state, when the food generates gas due to the progress of fermentation or respiratory action, the internal pressure in the food storage bag A gradually increases. When the internal pressure increases and a difference from the atmospheric pressure outside the food storage bag A occurs to some extent, the gas opens the ventilation pores (cuts) 6 and enters the tunnel-like ventilation portion 4, and the exhaust ports 5 at both ends thereof. Go out from. For this reason, since the internal pressure of the food storage bag A does not increase abnormally, the food storage bag A does not burst. And external air does not flow back into the food storage bag A. This is because the exhaust port 5 is lightly closed in a natural state, and atmospheric pressure does not act in the direction of opening it. Moreover, even if air enters the ventilation part 4, the external pressure does not increase from the inside of the food storage bag A, so that the air flows into the interior through the ventilation pores (cut 6). Nor.
As described above, according to the present embodiment, the internal gas pressure is discharged but the outside air is not introduced, so that the food storage bag A can be prevented from bursting while maintaining the taste of the food.
And since the food storage bag A of this embodiment does not use retrofitted parts or the like and uses only the originally necessary film, it can be manufactured at low cost without generating unnecessary material costs.

FIG. 5 shows a raw film for producing the food storage bag A.
11 is an outer film, the width is the same length as the inner film 12 mentioned later, and the edge part 1a of both sides is a part used as the center adhesion part 1 shown in FIG.
Reference numeral 12 denotes an inner film, which is a laminated film of an intermediate layer film 13 and an inner layer film 14.

  The outer film 11 is printed on the back side, but may be any film having printability. For example, a synthetic resin film such as polyethylene terephthalate or polyethylene is used.

The intermediate layer film 13 only needs to have non-breathability (gas barrier properties), and for example, vapor-deposited synthetic resin films such as polyethylene terephthalate, nylon, and biaxially stretched polypropylene are used.
The inner layer film 14 only needs to have heat sealing properties, and for example, a synthetic resin film such as polyethylene is used.

The intermediate layer film 13 and the inner layer film 14 are bonded with an adhesive 23, whereby the inner film 12 is made. Then, the printing surface side of the outer film 11 and the intermediate layer film 13 of the inner film 12 are bonded with an adhesive 22. As a result, a three-layer laminated film is produced.
Reference numeral 24 denotes a release agent, which is partially applied to the back side of the outer film 11. When the outer film 11 and the inner film 12 are laminated without applying the adhesive 22 to the in-mold part 24, a part that is not joined to each other is formed, and this part becomes the ventilation part 4.
And if the ventilation | gas_flowing pore (cut) 6 is made so that it may lead to the ventilation | gas_flowing part 4, a raw film will be completed.

Below, the manufacturing method of the said raw film is demonstrated.
6 is an explanatory view showing an in-mold process of the outer film, and FIG. 6 is an explanatory view showing a bonding process of the inner film. FIG. 7 is a diagram for explaining the notching process for the inner film, and FIG. 7 is a diagram for explaining the bonding process for the inner film and the outer film. FIG. 8A is an explanatory view of the notching step, and FIG. 8B is a perspective view of the notching drum.

  As shown in the diagram I of FIG. 6, a print 21 is applied to the outer film 11, and then a release agent 24 is applied to a necessary portion. The release agent 24 is applied in a strip shape with a desired width, and this process is called an in-mold process. On the other hand, as shown in FIG. II, an adhesive 23 is applied between the intermediate layer film 13 and the inner layer film 14 and the two films 13 and 14 are laminated together to form the inner film 12. This process is a bonding process.

Next, as shown in FIG. III in FIG. 7, a notching process is performed in which the notch 6 is made in the inner film 12 by the drum cutter 30.
A specific example of the notching process by the drum cutter 30 will be described with reference to FIG.
While winding the inner film 12 from the primary roll R1 to the secondary roll R2, the inner sheet 12 is wound around the drum cutter 30 and sent. The drum cutter 30 has a blade 32 attached to the outer surface of a cylindrical drum 31. Two blades 32 are arranged in parallel, and are provided at four locations at equal intervals in the circumferential direction. The drum 31 is rotated by a suitable drive source such as a motor.
When the drum cutter 30 having the above structure is used, the cuts 6 can be made efficiently while the inner film 12 is running as shown in FIG.

Returning to the IV diagram of FIG. 7 again, this step shows a bonding step of the outer film 11 and the inner film 12. In order to join the films 11 and 12, the adhesive 22 is sandwiched between them, but the outer film 11 is coated with a stripping agent 24 in the in-mold process, so only on the upper surface of the stripping agent 24. The portion where the outer film 11 and the inner film 12 are not bonded is formed. This portion becomes the ventilation portion 4.
Further, ventilation pores (cuts) 6 are aligned with the portion to be the ventilation portion 4.
By the above process, the raw film shown in FIG. 5 is continuously and efficiently manufactured.

It is a perspective view of the food storage bag concerning one embodiment of the present invention. It is a cross-sectional view of the food storage bag of FIG. It is an expanded sectional view of a ventilation part. It is explanatory drawing of the use condition of a food storage bag. It is an expanded sectional view of the film which comprises a food storage bag. FIG. I is an explanatory view showing an in-mold process of the outer film, and FIG. II is an explanatory view showing a bonding process of the inner film. FIG. III is an explanatory view of the notch forming process on the inner film, and FIG. IV is an explanatory view of the bonding process of the inner film and the outer film. FIG. A is an explanatory view of the notching step, and FIG. B is a perspective view of the notching drum.

Explanation of symbols

A Storage bag 4 Ventilation part 5 Exhaust port 6 Venting pore 11 Outer film 12 Inner film 13 Intermediate layer film 14 Inner layer film 22 Adhesive 23 Adhesive 24 Release agent

Claims (5)

A storage bag for storing and sealing food,
The film forming the storage bag is a laminated film in which the inner film and the outer film are bonded to each other,
Between the inner film and the outer film of the laminated film, a ventilation part that allows air circulation without being partially bonded is formed,
A food storage bag, wherein inside the ventilation film, ventilation pores that allow ventilation inside the storage bag are formed in the inside film, and an exhaust port that can communicate with outside air is formed in the outside film. The food storage bag according to claim 1, wherein the ventilation pores in the ventilation part are cuts formed in the inner film. The vent is on the surface of the storage bag.
It is provided so as to have a predetermined width in a straight line from one end to the other end of the storage bag,
The food storage bag according to claim 1, wherein the exhaust port is open at both ends of the ventilation portion. A laminated film in which an inner film and an outer film are bonded to each other;
A ventilation part is formed between the inner film and the outer film of the laminated film so that air can be circulated without being partially bonded, and the inside film can be vented to the inside of the storage bag in the ventilation part. A raw film for a food storage bag, characterized in that it has various ventilation pores. Using a drum cutter comprising a drum that is driven to rotate and blades that are attached at equal intervals in the circumferential direction on the outer surface of the drum,
An apparatus for producing an original film for food storage bags, wherein the original film is rotated while the original film is wound on the drum cutter and the original film is run.

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