Food degassing bag

Abstract

Provided is a food degassing bag which has a stable gas venting operation in response to carbon dioxide gas produced in different amounts and by which a gas venting effect can be obtained even when the internal pressure of a storage bag is low. The storage bag is composed of a packaging film layer 1 and a degassing layer 2. A polyethylene layer 2A and an oxygen barrier layer 2B compose the degassing layer 2. In the degassing layer 2, gas venting through-pores 4 are opened. An adhesive layer 3 adheres the packaging film layer 1 and the polyethylene layer 2A of the degassing layer 2 together. The adhesive layer 3 is formed sequentially with non-adhesive portions showing a stripe pattern. The non-adhesive portions form degassing vents leading to the outside of the storage bag.

Claims

1. A degassing bag for storing food that is sealed by heat sealing at an edge portion of a sheet which is composed of a packaging film layer and a degassing layer adhered to an inner side of the packaging film layer by an adhesive layer; wherein the degassing layer is composed of a polyethylene layer and an oxygen barrier layer and provided with gas venting through-pores penetrating through the degassing layer; the adhesive layer adhering the packaging film layer and the oxygen barrier layer of the degassing layer together includes adhesive portions to which adhesive is applied and non-adhesive portions to which no adhesive is applied so as to form a plurality of degassing vents fluidly communicating with the gas venting through-pores; the adhesive portions and non-adhesive portions are alternately placed so as to present a stripe pattern thereby the plurality of degassing vents formed by the non-adhesive portions leads to the outside of the storage bag at the edge portion of the degassing layer sealed by heat sealing; longitudinal edges of the degassing layer of the degassing bag are positioned apposed one another and heat sealed along the edge portion; and at least a portion of the through-pores of the portion of the degassing layers heat sealed together are overlaid on one another.

2. The food degassing bag according to claim 1, wherein the adhesive layer has an area ratio set to 3 to 2, of adhesive portions applied with an adhesive and non-adhesive portions having no adhesive applied.

3. The food degassing bag according to claim 2, wherein the non-adhesive portions show 0.25 mm to 0.35 mm-wide band shapes, and the through-pores are formed as 2 mm-wide and 3 mm-long pores penetrating through the degassing layer at intervals of 4 mm therearound.

4. The food degassing bag according to claim 1, wherein the non-adhesive portions show 0.25 mm to 0.35 mm-wide band shapes, and the through-pores are formed as 2 mm-wide and 3 mm-long pores penetrating through the degassing layer at intervals of 4 mm therearound.

5. The food degassing bag according to claim 1, wherein the oxygen barrier layer is formed by a vapor deposited aluminum layer.

6. The food degassing bag according to claim 1, wherein the oxygen barrier layer is formed by a vapor deposited silica layer.

7. The food degassing bag according to claim 1, wherein said plurality of degassing vents extend at an angle with respect to the edge portion of the sheet.

8. The food degassing bag according to claim 7, wherein a longer dimension of said gas venting through-pores extends substantially parallel to the edge portion of the sheet.

9. The food degassing bag according to claim 1, wherein a longer dimension of said gas venting through-pores extends substantially parallel to the edge portion of the sheet.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a back view showing an example of a bag body of the present invention.

(2) FIG. 2 is a sectional view of the main part of the present invention in a state where a pore portion is formed to penetrate through a degassing layer.

(3) FIG. 3 is a sectional view of the main part of the present invention showing an example of a bag body of the present invention.

(4) FIG. 4 is a sectional view of the main part of the present invention showing a state in which the degassing layers are put together at a heat seal portion.

DETAILED DESCRIPTION OF THE INVENTION

(5) The present invention has thus realized the original object such as having a stable gas venting operation in response to carbon dioxide gas produced in different amounts and also allowing to obtain a gas venting effect even when the internal pressure of the storage bag is low.

(6) Hereinafter, an example of the present invention will be described. Reference symbol 10 shown in the figures denotes a storage bag which stores food that produces carbon dioxide gas such as coffee beans or miso (refer to FIG. 1). The storage bag 10 is composed of a packaging film layer 1 and a multi-layered degassing layer 2 adhered to an inner side of the packaging film 1, and is closed by heat sealing.

(7) The packaging film layer 1 is formed of polyester with a printing 1A, and the multi-layered degassing layer 2 is adhered via an adhesive layer 3 to the inner side of the packaging film layer 1.

(8) The degassing layer 2 has a two-layer structure in which a polyethylene layer 2A and an oxygen barrier layer 2B are laminated. Because polyethylene is a breathable material, gas produced inside the storage bag 10 is transmitted through the polyethylene layer 2A to be discharged. On the other hand, the oxygen barrier layer 2B is formed of a material having high gas barrier properties, and is formed by a vapor deposited aluminum layer or a vapor deposited silica layer. Using a vapor deposited aluminum layer for the oxygen barrier layer 2B also enables sealing in the aroma of coffee beans, tea leaves, or the like.

(9) Also, in the degassing layer 2, gas venting through-pores 4 penetrating through the degassing layer 2 are opened in advance (refer to FIG. 2). The through-pores 4 are by penetrating through the polyethylene layer 2A and the oxygen barrier layer 2B by means of laser light irradiated toward the degassing layer 2. The illustrated through-pores 4 are formed as 2 mm-wide and 3 mm-long pores penetrating through the degassing layer 2 at intervals of 4 mm therearound. Moreover, the adhesive layer 3 is provided on the oxygen barrier layer 2B of the degassing layer 2 to be adhered to the packaging film layer 1. In addition, the through-pores 4 can be set in arbitrary shapes such as elliptic or oblong shapes.

(10) The adhesive layer 3 is a layer that adheres the oxygen barrier layer 2B and the packaging film layer 1 together, and is applied at a side close to the oxygen barrier layer 2B with a pressure sensitive adhesive. This adhesive layer 3 shows a striped shape by adhesive portions 3A applied with the pressure sensitive adhesive and non-adhesive portions 3B applied with no pressure sensitive adhesive (refer to FIG. 2). The non-adhesive portions 3B form degassing vents leading to the outside of the storage bag 10.

(11) The adhesive portions 3A of the adhesive layer 3 are applied with a pressure sensitive adhesive and dried, and then overlaid with the packaging film layer 1 and the degassing layer 2 and wound up by a roll to be pressurized for adhesion. On the other hand, the non-adhesive portions 3B are in a simply pressure-fitted state because no pressure sensitive adhesive is applied thereto.

(12) In the adhesive layer 3 thus configured, the adhesive portions 3A and the non-adhesive portions 3B are set to 3 to 2 in area ratio. According to experimentation, sufficient degassing could not be performed when the area ratio of the adhesive portions 3A and the non-adhesive portions 3B was set to 2 to 1. It was revealed as well when the area ratio of the adhesive portions 3A and the non-adhesive portions 3B was set to 1 to 1 that the adhesion strength declines. Further, forming the non-adhesive portions 3B in 0.25 mm to 0.35 mm-wide band shapes enabled always performing stable degassing in response to changes in internal pressure. At this time, the through-pores 4 were formed as 2 mm-wide and 3 mm-long pores at intervals of 4 mm therearound.

(13) According to the present invention, gas produced inside the storage bag 10 reaches the adhesive layer 3 through the through-pores 4 penetrating through the degassing layer 2 to be discharged externally form the non-adhesive portions 3B of the adhesive layer 3 (refer to FIG. 3). Also as in a back portion of the storage bag 10, putting the polyethylene layers 2A of the degassing layers 2 together to form a heat seal portion 11 results in a structure having a higher degassing ability because the through-pores 4 and the polyethylene layers 2A are overlaid (refer to FIG. 4).

(14) In addition, the storage bag 10 is not limited in shape to the illustrated example, and the present invention can be applied as long as it is a storage bag 10 having a multi-layered structure of the packaging film layer 1 and the degassing layer 2, such as, for example, a storage bag 10 provided at a bottom portion and side faces thereof with gussets. Also, as the food to be stored in the storage bag 10, a wide variety of food that produces carbon dioxide can be stored, besides coffee beans, miso, etc.

(15) The present invention is industrially applicable because it can be valuably used for hunting or sport shooting.

(16) Note that, this invention is not limited to the above-mentioned embodiments. Although it is to those skilled in the art, the following are disclosed as the one embodiment of this invention.

(17) Mutually substitutable members, configurations, etc. disclosed in the embodiment can be used with their combination altered appropriately.

(18) Although not disclosed in the embodiment, members, configurations, etc. that belong to the known technology and can be substituted with the members, the configurations, etc. disclosed in the embodiment can be appropriately substituted or are used by altering their combination.

(19) Although not disclosed in the embodiment, members, configurations, etc. that those skilled in the art can consider as substitutions of the members, the configurations, etc. disclosed in the embodiment are substituted with the above mentioned appropriately or are used by altering its combination.