JPH07137750A - Enclosed double bag - Google Patents

Abstract

PURPOSE:To provide an enclosed double bag which does not cause damage and pin holes or the like even when a hard material is contained and the bag is deaerated. CONSTITUTION:An inner bag 10 is closely stuck to an outer bag 20 at the seal formed at the outer side and the inside of inner bag is hermetically sealed to form an enclosed double bag 1. And an air path 34 is formed at a part of the outer side in order to secure an air stream against the space between the inner and outer bags 10, 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed double bag suitable for storing and distributing a hard material such as coffee beans in a sealed state.

[0002]

2. Description of the Related Art Generally, coffee beans such as coffee beans, which do not like moisture, are put into a bag in a fixed amount and are circulated under reduced pressure and sealed. As the bag for sealing, a laminated sheet in which gas impermeable materials are laminated is used.

In such a sealed bag body, the portion other than the inlet portion for accommodating the inner filler is adhered, the inner filler is accommodated in the bag body under a reduced pressure atmosphere close to a vacuum, and then the inlet portion is heated. Sealing is performed by bonding.

Therefore, when the filling material is a hard material such as coffee beans, the bag itself adheres to the coffee beans, and the unevenness of the coffee beans appears on the surface of the bag as it is.

[0005]

However, if a large number of such bag bodies containing the filler are stacked and transported in a box, a considerable load is applied to the bag body on the lower side. Further, due to vibration or the like, the bag bodies are rubbed against each other and pin holes or the like are generated in the bag body. For this reason, there is a problem in that the reduced pressure sealed state cannot be maintained and defective products are generated.

This problem is not limited to coffee beans and is common to the case where the filling material is relatively hard.

In view of the above problems, an object of the present invention is to prevent pinholes or the like from being generated in a bag that is depressurized and sealed even when the filling material is a hard material such as coffee beans. An object is to provide a sealed double bag that has an orderly appearance.

[0008]

DISCLOSURE OF THE INVENTION The present invention comprises an inner bag made of a gas impermeable material and an outer bag having a makeup process such as letters and figures. Each of the inner bag and the outer bag. While adhering the inner bag and the outer bag in the seal portion formed on the outer side portion, in a sealed double bag body configured to seal the inside of the inner bag, a part of the outer side portion, The hermetically sealed double bag body is formed with an air flow passage for ensuring air flow in the space between the inner bag and the outer bag.

Particularly, in the case where the closed double bag is a gusset type bag having a top seal portion, a bottom seal portion and a back seal portion formed on one side surface, the air flow passage Is preferably formed in the back seal portion, and more preferably formed in the lower outer side portion when the back seal portion is laid down in order to make the air flow passage inconspicuous.

[0010]

In the hermetically sealed double bag of the present invention, the air flow passages communicating between the inner bag and the outer bag are provided in the seal portions formed on the outer peripheral portions of the inner bag and the outer bag. Therefore, by leaving the sealed double bag which is decompressed and sealed in the atmosphere, an air layer comes to be present between the inner bag and the outer bag, and this air layer serves as a buffer between the bags. It will function as a material.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The concrete structure of the hermetically sealed double bag of the present invention will be described below with reference to FIGS.

FIG. 1 is a perspective view in which the present invention is applied to a gusset type sealed double bag. The closed double bag 1 comprises an inner bag 10 made of a gas-impermeable plastic film or metal foil, and an outer bag 20 made of a plastic film on which makeup processing such as letters and figures is applied.

At the outer peripheral portions of the inner bag 10 and the outer bag 20, the upper seal portion 3 is formed on the upper portion, the lower portion which is the bottom portion, and the back portion, respectively.
1, the lower seal portion 32 and the back seal portion 33 are heat-bonded to bond the inner bag 10 and the outer bag 20 and to further seal the inside of the inner bag 10.

The material of the inner bag 10 is, for example, a stretched plastic film of polypropylene, polyester, nylon or the like, a gas impermeable barrier layer, and the inner bag 10.
It is preferable to use a laminated sheet obtained by sequentially laminating the resin layer for sealant, which is the inner peripheral surface layer, of the above.

The barrier layer is formed in the inner bag 10 in an amount of oxygen permeation of 20 ° C. under a dry condition of 10 cc / m ² · 24 hrs.
The purpose is to have a condition of atm or less. For example, metal foil such as aluminum foil, zinc oxide, silicon oxide,
Vapor deposition films of inorganic oxides such as indium oxide, titanium oxide and aluminum oxide, and oxides of amphoteric metals, barrier plastic films such as ethylene-vinyl alcohol copolymer and vinylidene chloride, ethylene-vinyl alcohol copolymer and chloride A plastic film coated with a barrier resin such as vinylidene may be used.

The sealant resin layer is for forming a sealed portion by the inner bag, and is laminated at a position which becomes an inner peripheral surface layer of the inner bag 10. For example, low density polyethylene, polypropylene, ethylene-vinyl acetate. Copolymers may be utilized.

On the other hand, as the material of the outer bag 20, a stretched plastic film such as polypropylene, polyester, nylon or the like, which has been subjected to makeup processing such as letters and figures by back-printing, or a laminate of this stretched plastic film and a thermoplastic resin film. A film or the like is suitable.

As described above, the inner bag 10 and the outer bag 20 may be formed of laminated sheets, but they are shown as one sheet for convenience in the drawings.

Further, the seal portions formed on the outer peripheral portions of the inner bag and the outer bag are formed by forming a heat seal layer on the adhesive surface in advance or by dry laminating or the like. For this heat-sealing layer, low-density polyethylene, polypropylene, or ethylene-vinyl acetate copolymer can be used as in the above-mentioned resin layer for sealant.

More specifically, a rectangular sheet for the inner bag 10 and a sheet for the outer bag 20 having the same shape are superposed on each other, and as shown in FIG. By bending and bending so that the central portion has a palm-shape, and by heat-bonding the lower region shown by diagonal lines and the joint portion of the palm-shape, a double bag body having an open upper portion is formed.

In FIG. 2, for convenience, the sheet for the inner bag 10 and the sheet for the outer bag 20 are shown as one sheet. Further, the joint portion of the shape of the palm is bent so as to be parallel to the surface of the bag body as shown by an arrow in FIG.

The double bag thus obtained was filled with an internal filler such as coffee beans under a reduced pressure atmosphere, and then the upper region was heat-bonded under the same atmosphere to obtain a closed double bag shown in FIG. Get body 1.

In the present embodiment, as shown in FIG. 1, by forming seal missing portions at several positions in the heat-bonded portions of the outer side portions of the inner bag and the outer bag in the back seal portion 33, respectively. In a part of the back seal portion 33, a plurality of air flow passages 34 are formed to secure air circulation in the space between the inner bag 10 and the outer bag 20. It is sufficient if the width of the air flow passage 34 is about 5 mm or more, and it is sufficient if about 10% of the length of the back seal portion 33 is the air flow passage 34.

In the air flow passage 34, a heat seal layer for adhering the inner bag 10 and the outer bag 20 is not formed in a portion corresponding to the air flow passage 34, or an adhesive for dry lamination is not arranged. As a result, an airflow passage 34 as shown in FIG. 3 is formed in the back seal portion 33 as a seal escape portion.

Thus, when the air flow passage 34 is present,
When filling the inner filler under a reduced pressure atmosphere, even if heat bonding is performed in a state where the air between the inner bag 10 and the outer bag 20 is drawn, the air flow passage 34 Air enters the space between the inner bag 10 and the outer bag 20 through
An air layer 35 as shown in is formed.

On the other hand, when the inner filler is coffee beans, the inner bag 10 is closely attached to the coffee beans in order to reduce the pressure and to seal the inner bag 10, and the surface thereof has irregularities.

However, when the air layer 35 as shown in FIG. 4 is present, even when a large number of bag bodies having irregularities are stacked on the surface of the inner bag 10 due to the inner filler, the above-mentioned air layer 35 is formed.
Acts as a cushioning material between the adjacent bag bodies, and it is possible to prevent friction between the inner bag 10 and the inner filling material or the unevenness of the bag bodies due to vibration or the like.

As a result, even if the inner filler is a hard substance such as coffee beans, it is possible to prevent the inner bag 10 from being scratched or pinholes caused by rubbing.

If the air flow passage 34 is formed not on the front side of the back seal portion 33 as shown in FIG. 1 but on the back side, that is, the back seal portion in contact with the back surface, the air flow passage 34 becomes inconspicuous. .

Although the gusset type bag has been described in the above embodiment, the present invention is not limited to this, and the pillow type,
It can be applied to various sealed double bags such as a stand pack type and a three-sided seal type.

[0031]

According to the hermetically sealed double bag of the present invention, the adhesive portions between the inner bag and the outer bag are formed on the outer peripheral portions of the inner bag and the outer bag, respectively, and the air is passed through the adhesive portions. By forming a passage and forming an air layer between the inner bag and the outer bag, even if the bag is a decompressed and sealed bag filled with a hard material, scratches and pinholes will occur on the inner bag. It is possible to prevent the occurrence of defective products during transportation.

Further, the sealed double bag of the present invention has a good appearance because it has a neat appearance even if it is a depressurized and sealed bag.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a closed double bag body of the present invention, which is a gusset-type bag body filled with an inner filler.

FIG. 2 is a perspective view for explaining a method for producing a gusset type bag body.

3 is a partial cross-sectional view taken along the line AA of FIG.

4 is a cross-sectional view taken along the line BB of FIG.

[Explanation of symbols]

 1 Sealed Double Bag 10 Inner Bag 20 Outer Bag 31 Upper Seal Part 32 Lower Seal Part 33 Back Seal Part 34 Air Flow Path 35 Air Layer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshinori Imoto 1-1-1, Ichigaya-Kagacho, Shinjuku-ku, Tokyo Dai Nippon Printing Co., Ltd.

Claims (2)

[Claims] 1. An inner bag made of a gas impermeable material, and an outer bag having a makeup process such as letters and figures formed on the outer peripheral portions of the inner bag and the outer bag. While sealing the inner bag and the outer bag in the seal portion, in a sealed double bag body for sealing the inner bag,
An air flow passage for ensuring the flow of air to the space between the inner bag and the outer bag is formed in a part of the seal portion formed on the outer peripheral portion. Double bag. 2. A sealed double bag is a gusset bag having a top seal part, a bottom seal part, and a back seal part formed on one surface of a side part, and the air flow passage is provided with the back seal part. The sealed double bag body according to claim 1, wherein the sealed double bag body is formed in a portion.