JPS5962424A - Germless packing method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a sterile packaging method in which a coextruded film is used, the film is formed as necessary, and filling and sealing are performed continuously.

The aseptic packaging method has the advantage that there is no need to heat the food after filling it, compared to conventional long-term storage foods such as canned foods, or retort sterilization after filling and sealing, such as conventional retort foods.

Since reheating is not performed in this way, there is no quality deterioration that impairs the taste of the food, and there is no need to select special packaging materials that can withstand retort sterilization, so a wide range of materials can be used. reactor.

In recent years, aseptic packaging using plastic is being used in the fields of meat and dairy products.

This packaging requires that the plastic packaging material remain sterile and is nearly impossible to completely sterilize.

In addition, plastic films manufactured by various molding methods are contaminated by the molding environment, but in order to avoid this contamination, it is necessary to make the molding environment substantially sterile.
This cost a lot of money.

Therefore, for food packaging bags, packaging materials are currently sterilized by heat sterilization, ultrasonic waves, ultraviolet rays, radiation, or the like.

Even with these sterilization methods, there are problems with the heat resistance, dimensional stability, and integrity of packaging materials, and secondary contamination after sterilization, so that they have not become particularly widespread.

The present invention improves these drawbacks and is a sterile packaging method that uses a coextruded film, appropriately selects the sterility of the interface and the adhesive strength between the layers, makes it easy to open, and packs in a sterile state.

The present invention will be explained in detail below.

In the laminated material used in the packaging method of the present invention, the lid material (11
As shown in FIG. 1, it consists of a coextruded film of a polypropylene layer (2) and a polyethylene layer (3), both of which contain a small amount of ethylene-propylene elastomer.

Further, the container member (4) is made of a coextruded film of at least a polypropylene layer +51 and a polyethylene layer (6) to which 7 ethylene-propylene elastomers are added, as shown in FIG.

Here, the laminated materials used for the lid material (1) and container member (4) are:
The above may be used in the opposite manner.

In order to make the peel strength of the polypropylene layer (2) and the polyethylene layer (3) and the polypropylene layer (5) and the polyethylene layer (6) of the lid material (1) less than '&1001i+/15m, the polypropylene layer (2) and the polyethylene layer ( The amount of the ethylene-propylene elastomer added in 6) is suitably in the range of 5 to 20% by weight.

In addition, the polyethylene layer (3) of the lid material (1) and the container member (4)
) The thickness of the polypropylene layer (5) needs to be 30 μm or more so as not to break when peeling and winding.

The packaging method using the lid material (1) and container member (5) is as shown in FIG. Roll it out so that it looks like this.

On the other hand, the container member (4), like the lid material, is unrolled from the rolled-up raw material υ with the polypropylene layer (5) facing upward, and the polypropylene layer (5) is wound up with a winding roll 0z, and the polyethylene With the sterile surface of the layer (6) exposed, it is molded into a predetermined shape in the molding section Q3), and the molded container body Q4 is filled with the contents 09 in a sterile state. The lid material (
11 polyethylene layer (3) is rolled up with a winding roll Q6), the sterile surface of the polypropylene layer (2) is exposed, and the lid material (1) is superimposed on the container body (14).
This is a packaging method in which the product is heat-sealed at a temperature of 30°C, sealed, and then punched into a predetermined shape and packaged aseptically.

In the present invention, since a sterile material is used for packaging on the inner surface, a sterile state can be maintained without sterilization after packaging, and problems with heat resistance and dimensional stability of the material can be solved.

In addition, the container body (14) and the lid material (1) can be completely sealed by heat-sealing the polyethylene layer containing 75 to 20% by weight of ethylene-propylene elastomer and the polypropylene layer. Peel strength t400-500 g/1
Since it can be maintained at 5se, it can be easily opened by pulling the lid.

Peel strength between the above polyethylene layer and polypropylene layer'
This can be obtained by adding a large amount of ethylene-propylene elastomer to one layer in order to obtain 400 to 500 g/l 5 m, but in this case, the peel strength with other layers of the coextruded film is high ( It cannot be peeled off and removed, making it impossible to package using a sterile surface.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of one embodiment of the lid material used in the packaging method of the present invention, FIG. 2 is a cross-sectional view of one embodiment of the container member, and FIG.
The figure is an explanatory diagram showing the steps of the packaging method of the present invention. 1... Lid material 2, 5... Polypropylene layer 3.6... Polyethylene layer 4... Container member 14.
...Container body patent applicant Toppan Printing Co., Ltd.

Claims (2)

[Claims] (1) Ethylene-propylene elastomer Y Added polypropylene layer, a coextruded film of a polyethylene layer, a polyethylene layer added with an ethylene-propylene elastomer, and a coextruded film of a polypropylene layer (both of which are laminated materials) are each used as a lid material. and a sterile packaging method, in which the polyethylene layer and the polypropylene layer of the laminate are peeled off, and contents are filled between these peeled surfaces and sealed, as a container member. (2) The aseptic packaging method according to claim 1, wherein the amount of ethylene-propylene elastomer added to the polypropylene layer and the polyethylene layer is 5 to 20% by weight.