JPS6111190B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing aseptic packaging materials.

Conventionally, various methods are known as methods for aseptically packaging foods and the like by sterilizing packaging materials.

For example, there is a method of packaging food products by sterilizing the packaging material with hot water, chemicals, etc., or with blow-molded products, the bolts are sterilized by the heat during molding, and immediately after that, the food is filled to ensure sterility. There are methods of packaging according to the condition. In addition, by using a coextruded film, the inner surface of the coextruded film is heat sterilized to extrude the resin that does not easily adhere to each other, and then the non-adhesive inner surface is opened and food is filled into the sterile non-adhesive surface. There are methods to make this happen. However, the above-mentioned methods have one or more drawbacks, and it is currently impossible to obtain a fully satisfactory packaged product.

For example, in the above method, the method of sterilizing the packaging with chemicals, hot water, etc. requires a post-treatment such as a drying process to remove the sterilization, and also adds complicated factors such as the influence of residues. There are also physical sterilization methods such as ultraviolet high-frequency heating, but it is difficult to completely sterilize. Furthermore, in the method of supplying sterile packaging materials using coextrusion, one side of the film can be used as a packaging material after separation;
The other film often has to be discarded. In other words, in the process of manufacturing packaging materials, the width is usually wide, but in the subsequent stage of supplying it to the filling machine, it is often slittered to make it narrower.Therefore, one side of the film after separation becomes narrower, so it can be reused. This makes it difficult to dispose of, which is disadvantageous in terms of cost. Another drawback is that the surface opposite to the sterile surface is fed into the filling machine while still having bacteria attached to it.

As a result of various studies to package food aseptically as described above, the inventor of the present invention has found that packaging materials can be supplied aseptically by using a method of coextruding resin. Thus, the present invention was completed by discovering that foods and the like can be packaged aseptically.

The present invention described above will be explained in more detail below.

First, in the present invention, as shown in FIG. 1, two types of thermoplastic resins that do not have thermal adhesiveness to each other are coextruded and laminated onto a resin film 1 that has thermal adhesiveness with the thermoplastic resin. A laminated film A is produced by laminating thermoplastic resin films 2 and 3 on the resin film 1, and then, as shown in FIG. 2, the laminated film A is laminated in a sterile room or the like. The thermoplastic resin film 2 and the same thermoplastic resin film 3 are peeled off, and then, as shown in FIG. The packaging material of the present invention can be obtained by overlapping them and heating and pressurizing them to laminate them.

Although not shown in the drawings, in the present invention, instead of extruding two types of thermoplastic resins onto a resin film to produce a laminated film as described above, the resins constituting the resin film and the resins that have thermal adhesive properties to each other are used. The packaging material of the present invention can also be obtained by simultaneously co-extruding two types of thermoplastic resins in three layers to form a three-layer laminate film, and then carrying out the following steps in the same manner as described above. In addition, in the present invention, 2
Different types of thermoplastic resins may be coextruded to form a two-layer laminate film, which may be laminated to a resin film by thermal lamination. In this case, the resin film may be coated with an adhesive or the like if necessary.

In the present invention as described above, the coextruded thermoplastic resin film is heat sterilized by heating during extrusion molding, and the film surfaces are peeled off to form a packaging material. Therefore, the surface sterilized by heating during coextrusion is exposed, making it possible to obtain a packaging material in an almost sterile state.

In the above-mentioned invention, as the two types of thermoplastic resins that do not have thermal adhesiveness to each other, known resins can be used in any combination, for example,
A combination of resins having different molecular structures or a combination of an amorphous polymer and a crystalline polymer can be used.

Specifically, for example, a combination of vinylidene chloride resin and polyolefin resin, a combination of polyamide resin and polyolefin resin, a combination of polyester resin and polyolefin resin, or a combination of polypropylene resin and polyethylene resin. Combinations etc. can be used. Next again,
In the present invention, examples of the resin film include polyolefin resin films such as polyethylene and polypropylene, polyvinyl chloride resin films, polyvinylidene chloride resin films, acrylic resin films, polyester films,
Any known resins such as polyamide film, polystyrene film, polycarbonate film, and others may be used.

In the present invention, the resin film may be coated with an adhesive if necessary.

According to the present invention, there is no unused film to be discarded, and both sides of the supplied packaging material are sterile. Conventional methods for sterilizing packaging materials in aseptic filling machines include hydrogen peroxide sterilization and UV sterilization. However, there are recent concerns about the safety of hydrogen peroxide sterilization, including carcinogenicity, and
With the UV sterilization method, complete sterilization is difficult because if there is dirt or other particles attached, the shaded area cannot be sterilized. However, according to the present invention, since sterilization is performed by heat, sterile products can be produced safely and economically.

Next, an example of the use of the packaging material obtained according to the present invention will be described. For example, as shown in FIG. and then transfer the packaging material 12 to a second sterile chamber 13.
supply within. Inside this sterile chamber 13, a molding mold 14 for molding a resin film, a filling part 15 for food, etc. are arranged. First, the supplied packaging material 12 is molded into a cup shape by the molding mold, and then , the desired food is filled into the cup container 16 from the food filling section 15 .

On the other hand, a third sterile chamber 17 is arranged adjacent to the second sterile chamber 13, from which a sterile resin film 18 serving as a lid for the cup 16 is further supplied into the second sterile chamber 13. This resin film 18 is supplied onto the cup container 16 through a guide/heating roll 19, and then the resin film 18, which will become a lid, is thermocompressed onto the cup container 16 using a heating plate 20, etc., and then the cup container is placed in the sterile chamber 13. It can be sent outside and the individual cups can be cut to obtain a sterile packaged product. Alternatively, as shown in FIG. 5, a winding roll having two sheets of the packaging material 12, 12' of the present invention wound thereon is arranged in the sterile chamber 11, and then,
The two packaging materials 12, 12' are fed into the second sterile chamber 13. Next, packaging material 12,1
2' is a guide roll 21, a heat roll 23, 2
3' etc., and then two packaging materials 12, 1
A filling section 15 for food, etc. is disposed between 2', and the packaged object, such as food, is supplied from the filling port of the filling section while sealing the back.

Thereafter, they are sequentially bottom-sealed with a sealer 24, and then sent out of the chamber 13 and cut into individual pieces to obtain aseptically packaged products. Furthermore, as shown in FIG.
1, two winding rolls for winding up the packaging materials 12, 12' of the present invention are disposed in the packaging material 12, 12'.
12' is supplied to the second sterile chamber 13, and one of the packaging materials 12 is provided with a hole punching machine 25, a spout mounting part 26, which are arranged in the sterile chamber 13,
Drilling, spout mounting, cap mounting, etc. are performed using the cap mounting portion 27 and the like.

The packaging material 12 is then replaced with the other packaging material 12'.
The bags are overlapped with each other and both are sealed with a four-sided sealer 28 or the like to produce a bag. Since this bag is sealed in a sterile chamber and isolated from the outside air, the inside is sterile, and food, etc. can be filled aseptically through the spout to obtain a sterile packaged product. .

Next, the present invention will be explained in more detail with reference to Examples.

Example 1 Printing ink/Made kraft paper 80g/ ^m3 /Polyethylene 20μ/A foil 7μ/Polyethylene 20μ
A laminated film with the specifications was made, and a coextruded film of 20μ of nylon and 40μ of low-density polyethylene was made using a regular round die method coextruder.
(The nylon and low-density polyethylene are removable and have an interlaminar strength of 20 g/cm.) A base laminated film is laminated on this co-extruded film using an ordinary dry laminating method with an adhesive interposed therebetween, and the film is wound up.
Specifications are low density polyethylene 40μ nylon 20μ/
Adhesive/Printing ink/Grafted kraft paper 80g/
m ² /low density polyethylene 20μ/A foil 7μ/low density polyethylene 20μ, which is fed to a sterile three-sided seal filling machine (Figure 4). When unwinding from winding, low density polyethylene 40μ nylon 20μ
The surface is peeled off and is made of 20μ nylon / laminating agent / printing ink / 80g/m ² of kraft paper / polyethylene
20μ/A foil 7μ/Low density polyethylene 20μ Low density polyethylene 40μ specification. The laminated film unwound into the filling machine passes between rolls heated to 200°C under pressure. This results in
20μ polyethylene and 40μ low density polyethylene are thermally laminated, and the two separated laminated films are integrated. Next, add sterile milk while sealing. The inside of this filling machine is maintained in a sterile state, and therefore, together with the sterile film, it becomes a sterile packaging system as described above.

[Brief explanation of the drawing]

1, 2, and 3 are cross-sectional views of the packaging material showing the outline of the process of manufacturing the packaging material of the present invention, and FIGS. 4, 5, and 6 are sectional views of the packaging material of the present invention. FIG. 2 is a schematic configuration diagram showing an example of how packaging materials are used. 1...Resin film, 2, 3...Thermoplastic resin film.

Claims (1)

[Claims] 1 Two types of thermoplastic resins that do not have thermal adhesiveness to each other are coextruded and laminated on a resin film 1 that has thermal adhesiveness with the thermoplastic resin, and a thermoplastic resin film is formed on the resin film 1. 2 and 3 are laminated, and then the thermoplastic resin film 2 and the thermoplastic resin film 3 of the laminated film are peeled off, and then the non-peeled surface of the thermoplastic resin film 3 is peeled off from the resin film 1. A method for producing a packaging material characterized by laminating the outer surface of the material by heating and pressurizing the two.