JPS60251015A - Method sterilizing packaging material - 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 (Field of Industrial Application) The present invention relates to a method for sterilizing packaging materials, for example, a method for sterilizing packaging materials containing foods before packaging.

Technical Background As is well known, in order to preserve foods for a long period of time, it is necessary to prevent microbial contamination. One method to inactivate or sterilize microorganisms and enable long-term preservation of foods is to fill or package the contents in containers or packaging materials, such as canned, bottled, or retort foods. There is a method in which the food is sealed and then heat sterilized, and another method is to package the food in an aseptic atmosphere using separately sterilized foods and packaging materials.

Of the latter method, that is, packaging in a sterile atmosphere using pre-sterilized foods and packaging materials, methods for sterilizing the packaging materials include, for example, methods of sterilizing with ultraviolet light, sterilization with gamma rays and electronic There are methods using wires, methods using ethylene oxide gas, and methods using aqueous solutions of disinfectants such as hydrogen peroxide and ethyl alcohol. However, all of these methods have advantages and disadvantages, and in the case of sterilization methods using ultraviolet rays, if there is a obstruction such as dirt or dust between the irradiation device and the packaging material, this area will not be irradiated and sterilization will not be possible. Ethylene oxide requires extremely large-scale irradiation equipment and deteriorates or alters packaging materials. Ethylene oxide is a gas with extremely high bactericidal power or toxicity, so strict care is required when handling it. Also, aqueous solutions of sterilizing agents are generally used in packaging materials. It has the disadvantage that it has poor wettability with packaging materials, and even when coated on packaging materials, only island-like, uneven coatings are formed, resulting in uneven sterilization.

Regarding the improvement of the wettability of a sterilizing agent aqueous solution to packaging materials, Japanese Patent Application No. 15851/1983 by the applicant of the present invention describes
A method has been proposed in which a composition is used in which an aqueous disinfectant solution is mixed with an oil or fat and a surfactant. This special request was made in 1984.
The proposal of No. 15851 relates to a composition that improves the wettability of such an aqueous bactericidal solution, but according to subsequent studies by the present inventors, it is possible to improve the wettability of a bactericidal drug composition with improved wettability. It has been discovered that the bactericidal effect can be further improved by storing it for a certain period of time, ie, 5 days or more after application.

<Objective of the Invention> The present invention has been made based on the above discovery, and an object thereof is to provide a method for most efficiently (sterilizing) packaging materials using the above-mentioned sterilizing agent composition with improved wettability. do.

<Summary of the Invention> The present invention is a method for sterilizing packaging materials, which comprises applying a composition containing a sterilizing agent, oil and fat, and a surfactant to at least one side of the packaging material, and then storing the composition for 5 days or more. .

<Specific Description of the Invention> The packaging material according to the present invention may be any material, but the packaging materials normally used for sealed packaging of foods include paper, aluminum foil, plastic film, etc., or a laminated layer thereof. The present invention is also suitable for such packaging materials. . In addition, in the sterilization treatment, it is important that the inner surface that comes into contact with foods is sufficiently sterilized, so in the present invention as well, it is desirable to apply a sterilizing agent composition to the inner surface of the packaging material.

The surface to which the bactericidal composition is applied may be subjected to embossing, corona discharge treatment, plasma discharge treatment, etc. before application in order to further ensure uniform application.

In addition to hydrogen peroxide, ethyl alcohol and potassium hypochlorite can be used as the sterilizing agent according to the present invention, but considering the sterilizing effect, safety in case of contact with contents, cost, etc. , or ethyl alcohol is preferred. These oils and fats, surfactants,
and other additives, and the hydrogen peroxide aqueous solution that can be used is, for example, 5 to 35% by weight, and the ethyl alcohol aqueous solution that can be used is 60 to 70% by weight.

In addition, the oils and surfactants mixed with this bactericidal agent are
After all, it is necessary to consider the safety when coming into contact with the contents, and biological oils such as olive oil, soybean oil, corn oil, rapeseed oil, cottonseed oil, sunflower oil, camellia oil, lard, het, cod liver oil, butter, etc. Original fats and oils or liquid paraffin can be used, and as the surfactant, surfactants consisting of higher fatty acid esters such as glycerin fatty acid esters and polyglycerin fatty acid esters can be used. The mixing ratio of these oils and fats is preferably 01 to 80 parts by weight per 1 part by weight of the surfactant.

Regarding the wettability of a polyethylene film when oil, a surfactant, and each of the oil and the surfactant are added to a 30% by weight aqueous solution of hydrogen peroxide (H, O, Although it is described in Table 1 on page 4 of the specification of No. 15851, it is reprinted in Table 1 below.

Table-1 Naruyopu vC-Shotenshi 1 (again.

In addition, the reduction in bactericidal power due to decomposition of bactericidal agents when oils and surfactants are added to bactericidal agents is also described in Table 2, page 5 of the specification of the aforementioned Japanese Patent Application No. 15851/1983. This is also reproduced in Table 2 below.The composition is prepared by adding and mixing each composition to an aqueous hydrogen peroxide solution, and the hydrogen peroxide at the time of preparation and after 24 hours is mixed with potassium permanganate. The titrated water described as purified water in the table indicates that water was simply mixed with the hydrogen peroxide solution, and neither oil nor surfactant was added.

In addition, compositions containing bactericidal agents, oils and surfactants,
Other additives may be further included as necessary. For example, when the bactericidal agent is an aqueous hydrogen peroxide solution, sodium hydroxide, calcium hydroxide, etc., which promote the decomposition of hydrogen peroxide and improve the bactericidal power, are added to the composition.
H can be adjusted to about 15 to 8.0.

The germicidal drug composition can be applied to the packaging material by any method. Examples include roll coating, gravure coating, spray coating, or application by dipping the packaging material into a bath containing the germicidal drug composition.

The packaging material coated with the sterilizing drug composition needs to be stored for 5 days or more, preferably wrapped in a plastic film or the like. Apply the substance, and after this 5
This means that food manufacturers need to package and seal the food after at least 5 days have passed, and no other process or equipment is required other than storing it at room temperature for at least 5 days. If you are concerned about residual hydrogen peroxide, you can decompose the hydrogen peroxide by heating it by opening it immediately before packaging the food, or by irradiating it with ultraviolet rays, and in the case of ethyl alcohol, you can also heat it in an oven or infrared rays. The residual drug can be removed.

<Example 1> (A) "Po") Ethylene (thickness 60μ) 7 paper (basis weight 6O
F/m) / polyethylene (thickness 15μ) / aluminum foil (thickness 9μ) / polyethylene (thickness 50μ)” laminated material. 106 spores/10XI
Di, Aspergillus niger 105 cases/1[]X1
0ct was applied.

(b) After this, apply the following (11 to () to this microorganism-coated surface.
The sterilizing drug composition of 3) was applied by dip coating, rolled up, and then packaged with polyethylene (thickness: 100 μm).

◎Bactericidal drug composition (1)... 100 parts by weight of a 30% by weight hydrogen peroxide aqueous solution, Borig 1) serine fatty acid ester, polyoxyethylene rubitan fatty acid ester, and olive oil in a weight ratio of 1=1=2 Mixture 1 mixed with
A mixture of 5 parts by weight.

◎Bactericidal drug composition (2)...Bactericidal drug composition (further added 0.4 fi of sodium hydroxide to 11, P)l
is approximately 8.

◎Bactericidal drug composition (3)...60% by weight hydrogen peroxide aqueous solution.

(c) The number of bacteria remaining on this packaging material was examined immediately after application of the bactericidal composition, 5 days after storage, 10 days after storage, and 60 days after storage. The results are shown in Table 6.

As can be seen from Table 3, when a bactericidal composition containing oil and fat and a surfactant is used, the number of viable bacteria of Aspergillus subtilis and Aspergillus niger becomes 0 in 5 days (106 decrease in orders).

<Example 2> (a) The following 131 to (9) were added to the polyethylene film.
Nine different treatments were performed. In addition, for inoculation, Bacillus subtilis spore suspension was added at 6 x 107/10 x 10 crl.
This was done by applying with an airbrush.

(2) After inoculating a polyethylene film, it was immersed in a 60% by weight aqueous hydrogen peroxide solution at 20°C for 10 seconds.

(3) After inoculating the polyethylene film, roll it up and store it for 2 weeks.

(4) After inoculating the polyethylene film, apply 5 oil % hydrogen peroxide aqueous solution, dry it appropriately, roll it up and store it for 2 weeks.

(5) After inoculating the polyethylene film, apply a 70% by weight aqueous ethyl alcohol solution, dry it appropriately, roll it up and store it for 2 weeks.

(6) After inoculating the polyethylene film, add a mixture of 30% by weight hydrogen peroxide aqueous solution, polyglycerin fatty acid ester, and olive oil at a mixing ratio of 100:1:2 to 1ml/o.
Apply 1oo and d, dry properly, roll up and store for 2 weeks.

(After inoculating Corona 111 [L on 71 polyethylene film, apply a 30% by weight aqueous hydrogen peroxide solution, dry appropriately, roll up and store for 2 weeks.

(8) A polyethylene film was subjected to corona discharge treatment, and after inoculation, a 7-0% by weight ethyl alcohol aqueous solution was applied, dried appropriately, rolled up and stored for 2 weeks.

(9) Corona discharge treatment was applied to the polyethylene film, and after inoculation, a mixture of 30% by weight hydrogen peroxide solution, polyglycerin fatty acid ester, and olive oil at a mixing ratio of 100:1:2 was applied at a rate of 0.1 ml/100 (i application, moderate Dry, roll up and store for 2 weeks.

In addition, (51i21 processing is not saved, (
4) to (6) were inoculated without corona discharge, various sterilizing agents were applied, and stored; (71 to 9) were inoculated after corona discharge, various sterilizing agents were applied, and stored. Something,
There are two processes (6) and (9) according to the present invention.

(b) Cut these treated films into 10 α × 10 steel, soak them in 100 rnl of sterile physiological saline, and cut the films into 10 × 10 CI! I checked the number of viable bacteria.

As a result, 1 JlB, 7X10 shadows, 12+ 5.6
X 10 dandruff, +315.8 X 1 0'ke, [41
6,3X 10Ske, +519. IX104
ke, f6) 8.3 x 100 ke, (715,7X 1
01 pieces, (814,8x104 pieces, (912,9X 1
It was 0'ke.

<Example 6> A polypropylene film was gravure coated with a composition prepared by mixing a 60% by weight hydrogen peroxide aqueous solution with glycerin fatty acid ester and butter, dried appropriately, rolled up and stored for one week, and then the state of secondary contamination was observed. In order to investigate this, rewinding was carried out for 30 minutes in a closed system where Aspergillus niger spores were floating. After storing this for another week, cut into pieces of 10 (1 m x 10 (m) and soak in 100 N of sterile physiological saline, then 1 ox of each film.
The number of viable bacteria per 1o and d was examined.

Also, for comparison, ethylene oxide gas (EOG)
sterilized polypropylene film, R-ray sterilized polypropylene film, gravure coated with 30% by weight aqueous hydrogen peroxide solution, dried appropriately, rolled up and stored for one week. Yahari Aspergillus niger spores. The tube was rerolled for 60 minutes in a closed system where the cells were suspended, and the number of viable bacteria was measured after storing for one week.

<Effects of the Invention> The present invention has the above-described configuration, and can efficiently sterilize packaging materials and also prevent secondary contamination.

Patent application Written amendment by Kazuo Suzuki, representative of Toppan Printing Co., Ltd. (voluntary) Commissioner of the Japan Patent Office 1. Sterilization method for labeling and packaging materials in the case 3. Person making the amendment Relationship with the case Patent applicant address Taito, Tokyo 1-5, Taito-ku, No. 1 a) “
Column 6 of ``Detailed Description of the Invention'', Contents of Amendment a) Page 11, line 5 of the specification: ``Gamma rays are corrected to ``ultraviolet rays.''

(gamma rays) in the second line of the table on page 14 of the specification
Corrected to "ultraviolet light."

Claims (1)

[Claims] 1) A method for sterilizing packaging materials, which comprises applying a composition containing a sterilizing agent, oil and fat, and a surfactant to at least one side of the packaging material, and then storing the composition for 5 days or more.