JPS5820624A - Method of sterilizing sealed bag with mouth - 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 relates to a method for killing sealed bags.

Conventionally, there is a known method of sterilizing the inside of a sealed bag with a cap, supplying the sterilized bag, and opening and filling the bag in an aseptic atmosphere. It is.

Conventionally, ethylene oxide sterilization and gamma ray sterilization have been used to sterilize the inside of this sealed bag. However, in the case of ethylene oxide sterilization, in the case of sealed bags with a gas-filled bag, ethylene oxide does not enter the inside of the sealed bag, so sufficient sterilization effect cannot be obtained. In addition, due to the sterilization method using gamma rays, the polyolefin resin used in the company's products was decomposed by the gamma rays, producing an odor, and Japanese people had a unique radiation allergy. It has the disadvantage that it is undesirable for food applications.

As a result of research to eliminate the above-mentioned drawbacks, the present inventor has found that mold and yeast adhering to the inside of the sealed bag can be sterilized by immersing the sealed bag in heated water.
We have discovered that this can prevent acidic foods such as juice from spoiling, and have completed the present invention based on this knowledge.

That is, the gist of the present invention is the sterilizing power θ2 of a sealed bag with a mouth, which is characterized by immersing the sealed sealed bag in heated water and heat sterilizing the inside of the date sealed bag. According to the invention,
Since heat sterilization is used, there are not only hygienic issues but also less influence on packaging materials and food contents, and it is also possible to sterilize date-sealed bags with a single gas barrier layer, which was previously considered difficult.

Hereinafter, each invention will be explained in detail with reference to one drawing.

The method of sterilizing a sealed bag with a mouth according to the present invention consists of immersing a sealed sealed bag in heated water to heat sterilize it.

When a sealed bag is immersed in heated water and heated, dry heat sterilization occurs because there is little moisture inside the date sealed bag, and the sterilization effect is lower than that of heat sterilization. 1/12 of the heat resistance of L? It is 1/30th place. However, the types of microorganisms that cause spoilage differ depending on the food contents; for example, in the case of acidic foods such as juice, normal bacteria cannot grow and mold becomes a problem.

It is a type of yeast, and if mold and yeast are sterilized, acidic foods such as juice can be prevented from spoiling. By the way, mold and yeast are sensitive to heat, so dry heat sterilization can also be used to sufficiently sterilize them.

As shown in Fig. 1, the sealed bag used in the method of the present invention is a bag in which an upper film (1) made of two or more layers of synthetic resin film and a lower film (2) are heat-sealed. (4), the bag (4)K is equipped with a spout (5) for injecting or pouring out the contents, and a cap (7) is attached to the spout (5),
The inside of the bag is completely isolated from the outside air. In the drawings, (3) indicates a heat-sealed portion at the end of the bag, and (6) indicates a heat-sealed portion between the bag (4) and the spout (5).

Films used as constituent materials for the bag (4) include:
Polyethylene, ethylene-vinyl acetate copolymer, polyethylene resin such as ionomer resin, polypropylene,
A monolayer film of a thermoplastic resin film such as polyamide or polyester, a coextrusion film thereof, or a laminated film using the above-mentioned thermofusible resin film via a contact layer can be used. Particularly, preferred thermoplastic resin films for use in the sealed bags of the present invention are those that can withstand heat sterilization, such as polypropylene, polyamide, polyester, medium- and high-density polyethylene, and the like.

Furthermore, in the present invention, since it is possible to sterilize sealed bags with [ ] having barrier properties, metal foils, films such as polyvinylidene chloride, or single or laminated films or coextruded films of metal foils and the above-mentioned thermoplastic resin films are used. It is possible to use a composite film obtained by laminating the thermoplastic resin film or a laminated film of the thermoplastic resin film or a coextruded film coated with metal.

Example stretched polyamide (thickness 15μ)/aluminum foil (thickness 9μ)
/Double bag 101 made of a laminated film of unstretched polypropylene (thickness 70μ) and unstretched polypropylene film
(46cm x 46cs*) A black mold spore was numbered 10' on the inner surface of a sealed bag with a mouth, which was equipped with a spout made of K polypropylene and sealed with a polypropylene cap. The mixture was placed in a retort pot and heated at 120°C for 1 hour. Thereafter, orange juice that had been aseptically sterilized at high temperature for a short period of time was filled using a back-in-box bacterial filling machine. When 20 bags were tested and the contents were checked for deterioration after being stored at 30°C for 2 weeks, no spoilage was found in the contents. In addition, the D value of black mold spores on packaging materials in dry heat sterilization at 120'C is 2.
It was 5 minutes.

As detailed above, according to the present invention, contents that are easily oxidized, such as orange juice, can be filled aseptically.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a date-sealing bag used in the method of the present invention. (1)...Top film (2)...Bottom film (3)...Bag body end (4)... ...Bag body (5) ...Spout spout (6) ... Heat seal part (7) ...
... Cap patent applicant Dai Nippon Printing Co., Ltd. Agent Atsumi Konishi, patent attorney Figure 1:, 14 z 3143-

Claims (1)

[Claims] A method for sterilizing a date-sealed bag, characterized by immersing the sealed bag in heated water and heat-sterilizing the inside of the date-sealed bag.