JPH06102444B2 - Vacuum sealed packaging method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention uses a packaging bag body made of a multilayer film and an opening sealing piece made of a multilayer body, and The present invention relates to a vacuum sealed packaging method for maintaining the vacuum state of a stored item and performing hermetic sealing suitable for long-term storage.

[Conventional technology]

The inner and outer layers are heat-fusible resin layers, and the intermediate layer is a multi-layer film consisting of three or more layers, which are at least gas barrier resin layers. A multilayered body composed of a flexible resin layer as an opening sealing piece, for example, bedding, clothing, etc. are stored in the packaging bag body, and the air in the packaging bag body is sucked and discharged to reduce the pressure.
The invention was invented as Japanese Patent Application Nos. 2-214816 and 241624, which are pressure-reducing hermetic packaging materials for superposing an opening sealing piece on the opening of a packaging bag body and heat-sealing the whole to hermetically seal.

[Problems to be Solved by the Invention]

According to the above-mentioned vacuum sealed packaging, the bag mouth of the packaging bag is sealed,
That is, it is surprisingly difficult to depressurize the inside of the bag and hermetically seal the bag mouth by heat fusion while maintaining this depressurized state as much as possible. If not only those who specialize in handling this but also general households use a vacuum cleaner as a device for sucking air and an iron as a device for heat fusion using the above-mentioned materials, and if vacuum packaging can be easily performed. It is intended to provide a method capable of performing vacuum packaging easily, easily and surely because it can bring a greater contribution to the home.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention comprises a packaging bag body and an opening sealing piece, and the packaging bag body has an inner and outer layer having a heat-fusible resin layer and an intermediate layer having at least a gas barrier resin layer. The opening sealing piece is made of a multi-layer film composed of three or more layers, and the opening sealing piece is a multi-layer composed of a heat resistant layer such as paper, cellophane, polyethylene terephthalate resin, and fluororesin and a heat-fusible resin layer. After using the body, the vacuum sealing packaging material to store the goods in the body of the packaging bag, the air in the body of the packaging bag is sucked and discharged, and the opening is sealed by heat-sealing the opening with the sealing piece. In this case, after storing the product in the body of the packaging bag, prior to the vacuum suction, the opening is heated from above the opening sealing piece with the heat-sealing preventing piece interposed in a part of the opening to prevent the heat-sealing preventing piece. After heat-sealing and sealing the openings other than the part where By removing the blocking piece, the air in the packaging bag body is sucked out from the non-heat-bonded portion in which the heat-bonding block piece is interposed, and then this non-heat-bonded portion is heat-bonded to form the opening. The whole is hermetically sealed.

The heat-sealing-preventing piece in this invention may be one that does not melt at the temperature at which the heat-sealing resin layer of the packaging bag body or the opening sealing piece is melted by heating, and for example, a fluororesin is used in a plastic film. There are films, and others include paper, cloth and the like.

In the present invention, for example, a nylon resin, EVOH resin, PVDC resin or the like is preferably used for the gas barrier resin layer which is the intermediate layer constituting the multilayer film forming the packaging bag body,
A polyethylene resin, particularly preferably a low-density polyethylene resin, a linear low-density polyethylene resin or EVA is used for the heat-fusible resin layer which is the inner and outer layers. A polyethylene resin or the like is used for the heat-fusible resin layer forming the multilayer body forming the opening sealing piece, preferably a low-density polyethylene resin, a linear low-density polyethylene resin or EVA is used, and the heat-resistant layer is used. As the material, paper, cellophane, polyethylene terephthalate resin, fluororesin or the like is used.

In the multilayer film from which the main body of the packaging bag is made, the inner layer means the surface which the product comes into contact when the multilayer body film is used as the bag body, and the outer layer means the surface which is the outer surface of the bag body. The term "intermediate layer" means a layer intermediate between the inner layer and the outer layer. Therefore, when the intermediate layer is only one gas barrier resin layer, the multilayer film is composed of three layers, but the intermediate layer may be composed of two or more layers. In that case, the multilayer film is composed of three layers. Although it is composed of four times or more layers, it is necessary that one of the intermediate layers is a gas barrier resin layer.

Further, the multilayer film forming the body of the packaging bag may be prepared by any method, but an annular film laminated by an inflation method is obtained, which is cut to a desired length, and one end thereof is heat-sealed or the like. It is better to block it.

In this invention, in order to improve the adhesion between the heat-fusible resin layer of the packaging bag body, for example, the linear low-density polyethylene resin and the gas barrier resin layer, for example, EVOH resin, PVDC resin, etc. When using, for example, an adhesive polyolefin resin as an adhesive resin between the resins, or when forming a layer of, for example, a low-density polyethylene resin that is a heat-fusible resin layer on cellophane, which is a heat-resistant resin layer of the opening sealing piece, It is preferable to use an anchor coating agent.

In the present invention, the peripheral wall of the opening of the packaging bag body has a finer length than the length of the opening width (the width of the opening when the packaging bag is flattened in two, which is half the length of one circumference of the opening). The two strips are provided so as to face each other by sticking, fusing, adhering, or the like, and the thin strips extending from the peripheral wall are integrated by sticking, fusing, adhering, or the like. By doing so, there is no concern about pinholes on the peripheral wall near the opening, wrinkles do not undulate on the peripheral wall, and the folded part when the packaging bag body is folded in two is fixed, so they face each other. The position of the peripheral wall does not shift, and when handling the packaging bag, the multilayer film that is the body of the packaging bag has the effect of preventing it from being easily torn from the opening.
It is not necessary in this invention.

As long as this strip is flexible and can be heat-sealed, adhered or adhered to the packaging bag, for example, there is narrow tape or paper such as polyethylene, polypropylene, polyester, nylon, etc. When heat-bonding is desired, polyethylene or EVA may be used for the heat-bonding surface.

The upper limit of the position where the strip is provided in the opening of the bag by means such as adhesion or adhesion is considered to be the position where the upper end of the strip coincides with the opening, that is, the upper end of the bag mouth. And this position may shift down, but there is a limit to that.

That is, the opening sealing piece is provided over the strip, but it is preferable that the strip does not come out of the opening sealing piece. Providing above the top edge would make the aperture sealing piece larger, which is not desirable.

[Operation] After storing the goods in the body of the packaging bag, the air inside the packaging bag is sucked and decompressed, and then the opening is heat-sealed together with the opening sealing piece. Since heat fusion requires a fairly difficult technique, the present invention assumes that the entire width of the opening is hermetically sealed by heat fusion in two steps, and the items are stored in a packaging bag. First, heat seal all the other openings except the area where the air suction tube can move in and out, then suck and discharge the air in the packaging bag to reduce the pressure to the air suction tube when the suction and discharge are completed. The entire portion can be easily hermetically sealed in the opening by pulling out and immediately heat-sealing the unfused portion where the air suction tube was present. When leaving the area where the air suction tube can go in and out as an unfused part,
If the entire width of the opening is heated with the heat-sealing prevention piece interposed in this portion of the peripheral wall, the portion where the heat-fusion prevention piece is interposed does not heat-seal, and the other portion does not heat-seal. However, this operation is simple and can be easily performed by a housewife at home. When this is completed, the heat-sealing-preventing piece may be removed, the air suction tube may be inserted to suck and discharge air, and the air suction tube may be pulled out to heat-melt only the unfused portion.

〔Example〕

 An example of an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing an example of a packaging bag body used in the present invention, and FIG. 2 is an perspective view showing an example of an opening sealing piece used in the present invention, showing a state of being folded in two. Yes, FIG. 3 is a vertical cross-sectional side view showing an example of the structure of the multilayer film which becomes the packaging bag body, and FIG. 4 is a vertical side view showing the example of the structure of the multilayer body which becomes the opening sealing piece. .

In the figure, reference numeral 1 denotes a packaging bag body, which is made of, for example, a multilayer film 2 whose configuration is shown in FIG. The multilayer film 2 is formed into an annular shape by, for example, an inflation method and cut into an appropriate length, and one end thereof is heat-sealed to form a bottom 3 and the other end is an opening 4, 5 and 6 are multilayer films. The heat fusible resin layer 2 is a linear low density polyethylene 25μ, the gas barrier resin layer 7 is an EVOH resin 12μ, and the adhesive resin 8 is an adhesive resin for bonding these layers. , An adhesive polyolefin resin 9 μ, for example. 9 is an opening sealing piece, which is the fourth
Cellophane No. 350 is used as the heat-resistant layer 10 as shown in the example of the structure, and an anchor coating agent is applied to this, and low-density polyethylene 20μ is formed thereon as the heat-fusible resin layer 11. . The opening sealing piece 9 is folded in two with the heat-fusible resin layer 11 inside and covers the opening 4 of the packaging bag body 1 to hermetically seal it.

The strip 13 may be provided on the peripheral wall 12 of the opening 4 by adhesion, fusion, adhesion or the like. This strip 13 has an adhesive layer 15 provided on a flexible substrate 14 such as polyethylene, polypropylene, polyester, nylon or paper, as shown in FIG. Adhere to the peripheral wall 12 with. Note that the adhesive layer is not required when not using adhesion, and may be a layer required for adhesion and fusion.
Further, the length of the strip 13 is longer than half the length of one round of the peripheral wall 12 of the opening 4, and two strips are provided facing the peripheral wall 12 from each side. The strips extending from the peripheral wall are integrated by adhesion, fusion, adhesion or the like. This integrated part is useful for carrying out an operation in which the strips of the left and right integrated parts are held with both hands and the peripheral wall of the opening is aligned without any deviation. Furthermore, this strip is effective in preventing the formation of pinholes on the peripheral wall, preventing wrinkles, waviness, and tearing during handling. .

An example of carrying out the method of the present invention using this will be described. First, clothes, bedding and the like are stored in the packaging bag body 1. When the packing is finished, a heat-sealing prevention piece 16 made of paper is sandwiched between the openings 4 of the packaging bag 1 and the openings 4 of the bag are properly aligned. At this time, if the strip 13 is provided, you can easily open the bag by holding both ends and pulling lightly.
They are neatly lined up and there is no rippling. Then, the opening sealing piece 9 is applied to the opening 4 by folding it in two with the heat-fusible resin layer 11 inside. When the entire surface of the opening sealing piece 9 is heat-sealed with an iron in this state, the packaging bag 1
The peripheral walls 12 of the opening 4 and the peripheral wall 12 and the opening sealing piece 9 are heat-sealed, but the portion of the peripheral walls 12 of the opening 4 in which the heat-sealing prevention piece 16 is sandwiched is not welded. Is. Next, from the outside of the opening 4, the portion where the heat-sealing preventing piece 16 is interposed is cut along the opening 4, and the heat-sealing preventing piece 16 is removed from the cutout port. With this, a passage extending between the inside and the outside of the packaging bag 1 is formed. Therefore, when the suction tube of the vacuum cleaner is inserted into this passage and the vacuum cleaner is started, the air inside the packaging bag is sucked and discharged. The inside of the bag is in a reduced pressure state. When a satisfactory depressurized state is obtained, pull out the suction tube and heat-seal the cut-out port again with an iron while maintaining the depressurized state, and the entire opening of the packaging bag and the opening sealing piece will be heat-sealed. Finish the work.

In this way, a householder can easily wear clothing,
Various items including bedding products can now be vacuum-sealed. It is needless to say that a heat-sealing machine can be used for heat-sealing without being limited to a household iron, and the use of a vacuum pump does not hinder the suction and discharge of air.

〔The invention's effect〕

As described in detail above, the present invention uses a bag made of a plastic film, and the inside of the bag is in a depressurized state, and it is extremely difficult to heat-bond the entire bag mouth while maintaining the depressurized state. However, by interposing the heat-sealing preventing piece in a part of the opening, and once performing the heat-sealing operation on the opening, the intervening portion of the heat-sealing preventing piece maintains the unfused state, This can be used as a suction and discharge path for the air in the bag, and after suction and discharge, only the very short unfused part needs to be heat-sealed, so heat-sealing under adverse conditions such as reduced pressure can also be made extremely easily. Now, not only professionals but also general households can easily carry out vacuum sealed packaging.

[Brief description of drawings]

The accompanying drawings are for explaining the present invention, and FIG. 1 is a perspective view showing an example of a packaging bag body used in the present invention,
FIG. 2 is a perspective view showing an example of an opening sealing piece, FIG. 3 is a vertical sectional side view showing an example of a structure of a multilayer film which is a packaging bag body, and FIG. 4 is a multilayer body which is an opening sealing piece. Fig. 5 is a vertical sectional side view showing an example of the constitution of Fig. 5, and Fig. 5 is a vertical sectional side view showing an example of the constitution of the strip. 1: Packaging bag body, 4: Opening 5, 6, 11: Heat-fusible resin layer 7: Gas barrier resin layer 9: Opening sealing piece, 16: Heat-fusion preventing piece

Claims (1)

[Claims] 1. A packaging bag main body and an opening sealing piece, wherein the packaging bag main body comprises three or more layers in which the inner and outer layers are a heat-fusible resin layer and the intermediate layer is at least a gas barrier resin layer. Created with a multilayer film consisting of layers, the opening sealing piece is
After storing the product in the packaging bag body using a vacuum sealing packaging material, which is a multi-layered body composed of a heat-resistant layer such as paper, cellophane, polyethylene terephthalate resin, and fluorine resin, and a heat-fusible resin layer. , The air in the body of the packaging bag is sucked and discharged, and the opening is sealed by heat-sealing the opening with a sealing piece, and after the product is stored in the body of the packaging bag, prior to vacuum suction, With the heat-sealing prevention piece interposed in one part, the opening is heated from above the opening sealing piece to heat-seal and seal the openings other than the portion where the heat-sealing prevention piece is interposed, and then heat-sealing By removing the blocking piece, the air in the packaging bag body is sucked out from the non-heat-bonded portion in which the heat-bonding block piece is interposed, and then this non-heat-bonded portion is heat-bonded to form the opening. A vacuum-sealed packaging method, characterized in that the whole is hermetically sealed.