JPS60198156A - Sterilization of plastic product - 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 [Technical Field of the Invention] The present invention relates to a sterilization method for sterilizing a large number of plastic products such as plastic films and plastic containers with alcohol.

[Technical background of the invention and its problems]

Conventionally, dry and wet heat sterilization has been common as a method for sterilizing containers. However, heat sterilization, whether dry or wet, not only takes a long time to sterilize;
Plastic products may become deformed due to heating.

Furthermore, as a method of sterilizing at room temperature, there is a method using hydrogen peroxide, but this method still poses problems in terms of environmental hygiene and food hygiene.

There is an ultraviolet irradiation sterilization method that eliminates these drawbacks. Although it can be sterilized one by one without any problems, when sterilizing many items at once, the shaded areas may not be sterilized. There was a drawback.

As a method of sterilizing a large number of plastic products at once using ethyl alcohol, which has sterilizing properties, as shown in Japanese Patent Application Laid-open No. 149231/1982, a large number of plastic products are sterilized using a plastic sterilizer. Store it in the bag of
It has been shown that ethylalconyl is added to the bag and the mouth of the bag is sealed to sterilize it.
It has the disadvantage that it cannot sterilize a large number of items uniformly, leaving some areas that cannot be sterilized.

[Purpose of the invention]

An object of the present invention is to provide a method for sterilizing plastic products using ethyl alcohol that can be sterilized at room temperature and in which there is no K that cannot be sterilized.

[Summary of the invention]

As shown in FIG. 1, the present invention stores a large number of plastic products (1) in plastic films or plastic containers in a bag (2) made of plastic snack film, and after reducing the pressure inside the bag to below atmospheric pressure. This is a method for sterilizing plastic products, in which a gas containing 6 to 10 parts by weight of ethyl alcohol vapor is sealed and sealed.

[Detailed description of the invention]

The plastic products to be sterilized include plastic materials, lids coated or laminated with plastic materials, bags having the above structure, or containers having the above structure, furthermore, plastic materials or plastic materials and paper, nonwoven fabrics,
It is a packaging material made of a laminated material with aluminum foil coated with hot melt resin, and is a glass product that easily deforms and deteriorates in quality when heated.

Next, the bags used to package a large number of the aforementioned plastic products can be made of polyethylene, polypropylene, etc., as long as they generally have almost no air permeability and can retain gas containing alcohol vapor for a certain period of time. , nylon, polypropylene coated with vinylidene chloride, etc., either alone or in a laminate, preferably with an oxygen permeability of 100"7 m224 hrs or less in order to enhance the sterilizing effect.

In order to reduce the pressure in the bag containing the plastic product to below atmospheric pressure before filling the gas containing alcohol vapor, it is best to use a gas displacement packaging machine with a vacuum chamber or a breathing type gas displacement packaging machine. , then a gas containing alcohol vapor may be enclosed.

The gas containing ethyl alcohol vapor is a gas mixed in air, nitrogen, carbon dioxide gas, or a mixture thereof containing ethyl alcohol vapor at a saturated vapor pressure or lower, and carbon dioxide gas is preferably used. The mixing amount of this ethyl alcohol vapor is
It is preferable that the amount is 3 parts by weight or more and 10 parts by weight or less because it is below the explosive limit, can be used safely, and there is little condensation of ethyl alcohol vapor, so that the sterilizing effect can be maintained.

The concentration of ethyl alcohol vapor within the above range may be selected depending on the degree of contamination of the plastic product, the material of the bag, the sterilization time, etc.

Furthermore, when the degree of contamination of the plastic product is high or in order to shorten the sterilization time, ethyl alcohol may be added as an auxiliary liquid by spraying or injecting it, or by making it supported on a suitable carrier.

〔Example〕

Example 1: Approximately 1 spore of Aspergillus niger as a filamentous fungus was placed in a polypropylene margarine container.
．． 10 containers containing 5 x 103 plants were stacked closely together.
This was placed in approximately 11 capacity bags made of a laminated material of vinylidene chloride coated polypropylene and polyethylene, treated under the following conditions, and stored at 25°C for 7 days, after which the containers were removed from the bags and the presence or absence of bacteria in each container was determined. was inspected.

In this test, culture was performed at 25°C for 10 days using a glucose/peptone medium to which chloramphenol was added.

A: Degassed carbon dioxide gas containing 10 parts by weight of ethyl alcohol using an Aiki vacuum packaging machine for about 1 minute, then filled and sealed.

B: After degassing nitrogen gas containing 10 parts by weight of ethyl alcohol using an Aiki vacuum packaging machine for 30 seconds, filling and sealing.

C: Air-containing device): Carbon dioxide gas containing 10 parts by weight of ethyl alcohol was gradually injected into the bag for about 1 minute, and the bag was sealed.

(Replacement rate 97+) The above results are shown in Table 1.

Table 1 Number of test areas The molecules in the table on the left indicate that bacteria are alive. A　O/10 Number of containers: denominator 4-transfer bacteria are alive B 2/8 Indicates the number of containers that are not included.

C1o/.

D 3/7 Example 2; 100 sheets of lid material made of printed aluminum foil (12μ) coated with hot melt resin (Dainippon Ink & Chemicals Co., Ltd. 1) After storing it in a bag and performing deaeration operation for about 50 seconds with an Aiki vacuum packaging machine, fill it with air 11 containing 10 parts by weight of ethyl alcohol, and after sealing,
When the samples were stored at 25° C. for 5 days and tested in the same manner as in Example 1, no viable bacteria were found among the 99 samples.

Furthermore, when lid materials with the same configuration were simultaneously stored in an air-containing state, bacteria were detected in 64 lid materials.

Furthermore, absorbent cotton soaked in ethyl alcohol 022I was placed on the lid material, sealed with air 11, and inspected after storage in the same manner. Survival bacteria were detected on 18 sheets, and the printing on the top lid material was smeared. occured.

On the other hand, according to the method of the present invention, no change or deformation of the lid material was observed.

〔Effect of the invention〕

Since the present invention sterilizes by the method described above, the surface of plastic products such as stacked packaging materials and materials with minute gaps can be sterilized evenly, and can be sterilized without deformation or change. Furthermore, since ethyl alcohol is used, sterilization can be performed without adversely affecting the human body.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an example of the sterilization method of the present invention. Patent applicant Toppan Printing Co., Ltd. Representative Kazuo Suzuki

Claims (2)

[Claims] (1) Plastic fin, near...? '-pH 7, a large number of plastic products in plastic containers are stored in a bag made of plastic film, and after the inside of the bag is depressurized to below atmospheric pressure, a gas containing 6 to 10 parts by weight of ethyl alcohol vapor is sealed. , a method for sterilizing sealed plastic products. (2) Does the bag have an oxygen permeability of 100cc/7? j 24
A method for sterilizing a plastic product according to claim 1, which is made of a material having an hrs or less.