JPS60251075A - Stacker of 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 <Industrial Application Field> The present invention relates to an aggregate of packaging materials, more specifically, one-sided,
To provide an accumulation of packaging materials which are sterilized on both sides even though they have been subjected to sterilization treatment and which are free from the risk of secondary contamination.

Technical background As has been well known, in order to preserve food for a long period of time, it is essential to prevent microbial contamination. As a method to inactivate or sterilize microorganisms and enable long-term preservation of foods.

On the one hand, there is a method of heating and sterilizing the contents after filling or packaging the contents into containers or packaging materials and sealing them, such as canned, bottled, or retort foods.On the other hand, there is a method of heating and sterilizing foods that have been separately sterilized and packaging. There is a method of packaging in a sterile atmosphere using materials.

- In the latter method, that is, packaging in a sterile atmosphere using food and packaging materials that have been sterilized separately in advance, roll coating is performed with an aqueous solution of a sterilizing agent, such as an aqueous solution of hydrogen peroxide or an aqueous solution of ethyl alcohol. These sterilizing agent aqueous solutions are applied to the inner surface of the packaging material to sterilize it.

Since the wettability of the normally used heat-adhesive synthetic resin layer is poor, uniform coating cannot be achieved and the coating gradually becomes island-like. However, I wonder if the above-mentioned bactericidal agents can completely sterilize the bacteria at the same time as they are applied.

Sufficient time is required for sufficient sterilization.
There is a problem in that a sterilizing solution distributed unevenly in islands can only perform insufficient sterilization. In addition, when applied by means such as the above-mentioned roll coating, four coats on one side of the packaging material are coated.
- Since the second sterilizing agent is applied, the other side is not sterilized, and when this packaging material is rolled up or stacked after being cut, there is a problem that the one side that was supposed to be sterilized will be contaminated again. Currently, the reality is that products are sterilized twice during packaging.

By the way, the applicant of this case, for example,
No. 1 proposed a sterilizing agent composition with improved wettability to the synthetic resin layer, but when this composition is used, the composition applied to the synthetic resin layer does not become non-uniform and can be effectively sterilized. At the same time, this packaging material is rolled up,
They discovered that if they are cut and stored in stacks, the side that was not coated will also be sterilized at the same time.

<Object of the Invention> The present invention has been made based on the above-mentioned discovery, and is a packaging material that is sterilized during manufacturing with a sterilizing solution such as a hydrogen peroxide solution or an ethyl alcohol solution, and is designed to prevent secondary contamination. The object is to provide a collection of packaging materials that is safe and can therefore be immediately pulled out and packaged without having to be sterilized again during food packaging.

<Summary of the Invention> The present invention involves uniformly applying a sterilizing agent to one side of a rolled packaging material, then rolling it up again or cutting it into sheets, which are then stacked to form a synthetic resin film. It is a collection of packaging materials wrapped in

DETAILED DESCRIPTION OF THE INVENTION The packaging material according to the invention may be any material (e.g. paper, metal foil, or conventional laminated material including plastic film). has a heat-adhesive synthetic resin layer on its innermost surface, but of course such a layer may also be used. Examples of the heat-adhesive synthetic resin include polyethylene, polypropylene, ethylene-vinyl acetate copolymer, and ionomer. However, as will be described later, a mixture of water-absorbing resin powder and metal powder may also be used.

Examples of disinfectants include hydrogen peroxide and ethyl alcohol, but in addition to these, primary hypochlorous acid (IJ) can also be used, and any of these can be applied as an aqueous solution together with other additives. In addition, considering the sterilization effect, safety when coming into contact with the contents, cost, etc., hydrogen peroxide aqueous solution or ethyl alcohol aqueous solution is preferable, and among them,
A hydrogen oxide aqueous solution having a weight ratio of 35 to 35 and an ethyl alcohol aqueous solution having a weight ratio of 30 to 70 are preferred.

Some ingenuity is required in order to uniformly apply this sterilizing agent to the surface of the packaging material, but this ingenuity is described in the above-mentioned Japanese Patent Application No. 15851/1982, or in the patent application filed on the same date as the present application. It is described in the specification under the name "Method for sterilizing packaging materials."

That is, by applying a composition prepared by mixing the aqueous solution of the sterilizing agent with an oil or fat and a surfactant onto the packaging material, it is possible to uniformly apply the composition. Oils include olive oil, soybean oil, corn oil, rapeseed oil, cottonseed oil, sunflower oil, camellia oil, lard, and het.

Biological fats and oils such as cod liver oil and butter, or liquid paraffin can be used, and as the surfactant, surfactants consisting of glycerin fatty acid esters and polyglycerin fatty acid esters can be used. In addition, when the bactericidal agent is hydrogen peroxide, in order to promote its decomposition and improve its bactericidal power, hydroxide is added to the composition to improve its pH. can also be adjusted to about 75 to 80.

Another method for uniformly applying a sterilizing agent to a packaging material is a method described in a patent application filed on the same date under the title ``Method for sterilizing packaging materials.'' That is, by forming a heat-adhesive synthetic resin layer containing water-absorbing resin powder on the innermost surface of the packaging material, and applying a bactericidal agent to this innermost surface, the bactericidal agent 1 is absorbed and adsorbed to the water-based resin powder. Or it can be absorbed and applied evenly. The water-absorbing resin powder has the ability to absorb or adsorb 40 to 700 times its own weight of water, and is a vinyl alcohol-acrylic acid copolymer.

Chin p-sodium polyacrylate graft copolymer,
Although starch-acrylonitrinograft copolymers and the like are known, vinylalco-)L-acrylic acid copolymers and starch-polyacrylic acid graft copolymers are preferred. Furthermore, when the sterilizing agent is hydrogen peroxide, a heat-adhesive synthetic resin layer containing Ano L minium powder or stainless steel powder mixed with water-absorbing resin powder is provided.
Its bactericidal effect is further improved. In addition, the water-absorbing resin powder is 1 to 50 parts by weight per 100 parts by weight of the heat-adhesive synthetic resin, and the affiliated powder is 1 to 50 parts by weight per 100 parts by weight of the water-absorbing resin powder.
Mixing a trace amount of 10 parts by weight is sufficient.

It is also effective to emboss the surface of the packaging material or subject it to corona discharge or plasma discharge treatment before applying these sterilizing agents to ensure uniform application.

Application may be carried out on one side of the packaging material by any method such as roll coating, gravure coating or spray coating, but this does not preclude application to both sides (for example, by placing the packaging material in a bath containing a disinfectant). It may be applied to both sides by a method such as dipping.

The packaging material coated with the sterilizing agent is then rolled up again or cut into sheets and then stacked to prevent bacteria from entering from the outside.

Packaged in synthetic resin film such as polyethylene.

Afterwards, this packaging material is transported to a food factory and used for packaging food items in an aseptic atmosphere, but in order to ensure the sterilization effect, it must be coated with a sterilizing agent and wrapped in polyethylene, etc. , until it is unraveled and used for food packaging.
It is desirable to store it at room temperature for a certain period of time. The fixed period is, for example, 5 days, and as can be seen from the examples described later, the number of viable bacteria decreases by an order of 10' to 102 after storage for 5 days and 1 hour. Furthermore, if stored for 10 days, the order decreases by 102 to 103.

1. When using this packaging material in a food factory, in order to remove any remaining sterilizing agent, wash it with water or use infrared heating immediately before use.

Alternatively, when the chemical solution is hydrogen peroxide, it is desirable to perform decomposition using ultraviolet rays.

<Example 1> (a) [Polyethylene (thickness 30 μm) 7 papers (basis weight 6 o
9/m ) / polyethylene (thickness 15μ) / aluminum foil (thickness 9μ) / polyethylene (thickness 50μ)'' laminated material of polyethylene (thickness 50μ). 'J 106 spores/
10X 10 a! -Aspergino-Sniper 105
KE / IQ It was packaged in 100 μm thick paper.

◎Bactericidal composition (1)...30 parts by weight To 100 parts by weight of hydrogen peroxide aqueous solution, polyglycerin fatty acid ester and polyoxyethylene rubitan fatty acid ester) L
and olive oil in a weight ratio of 1:1:2 (Mixture 1)
A mixture of 5 parts by weight.

◎Bactericidal drug composition (2)...Bactericidal drug composition +116
0.4g of IJium was added and the pH was adjusted to about 8.

◎Bactericidal drug composition (3)...3o weight ratio hydrogen peroxide aqueous solution.

(c) Immediately after applying the sterilizing drug composition to this packaging material.

Number of bacteria remaining after 5 days, 10 days, and 60 days of storage (g)
I looked into it. The results are shown in Table 1.

Table 3 As can be seen from Table 3, when using a bactericidal composition containing a mixture of oil and fat and a surfactant,
The viable bacterial count of H. tilli and Hyaspenosycillus 2″Cano becomes 0 in 5 days (a decrease of the order of 106).

<Example 2> (a) [Polyethylene (thickness 30μ) 7 papers (basis weight 609
/rI? )/polyethylene (thickness 18p)/aluminum foil (thickness 9μ)” laminated sheet aluminum? fi
On the surface - (A) a synthetic resin layer consisting of 100 parts by weight of polyethylene and 10 parts by weight of tohinyl alcohol-acrylic acid copolymer; (B) a synthetic resin layer consisting of 100 parts by weight of polyethylene and 10 parts by weight of starch-sodium polyacrylate graft polymer; Synthetic resin layer, (C) synthetic resin layer consisting of 100 parts by weight of polyethylene, 10 parts by weight of vinyl alcohol-acrylic acid copolymer and 1 part by weight of aluminum powder, (D+100 parts by weight of polyethylene and vinyl alcohol-acrylic acid copolymer) A synthetic resin layer consisting of 10 parts by weight and 1 part by weight of stainless steel powder, and for comparison (E) polyethylene 100
Five types of samples A-
B+C1D+E was produced.

(b) These samples A to EK, Bacillus subtilis spore liquid 106/10 x 10d, Aspergillus subtilis
The solution was applied to different locations at a ratio of 10 pieces of Nigar liquid/10 x 10 cIIL and allowed to absorb the liquid.

(c) Samples A-E with bacteria attached in this way are
Pass the chemical solution in a bath containing a 50% hydrogen peroxide aqueous solution for about 10 seconds, then squeeze both sides of the packaging material with a squeezing roll to remove the excess, and dry in an infrared heater at about 100°G. .

After passing the sample for 5 seconds, roll it up and prepare each sample A.
-1, B-1, C-1-D-1, and E-1. In addition,
The remaining sterilizing solution immediately after drying was approximately 1.5 fl/ml.

Samples A-2 and B were prepared in the same manner as above except that +2115 weight hydrogen peroxide aqueous solution was used as the sterilizing chemical solution.
-2, C-.2, and D-2-E-2 were produced.

The residual sterilizing solution of these samples was also about 1.0% immediately after drying.
It was 5 fl/rrl.

Samples A-3, B-3,073'; D-3, and E-3 were produced in the same manner as above, except that an aqueous ethyl alcohol solution with a weight of +3170 was used as the disinfectant solution. The residual chemical solution in these samples was about (1
It was 5E//trt.

2) The 15 types of samples obtained in this way were each wrapped in a polyethylene film with a thickness of 100μ, and stored.
The number of bacteria (k) per 0x10crIt was investigated. The results are shown in Table 2vc below.

Table 2 *EtOH: Ethyl alcohol aqueous solution <Example 3><Example2> Bacterial spores prepared in the same manner as in (a) and (b) were applied to both sides, and only one side was sprayed with 30i1 hydrogen peroxide solution. After coating and drying, roll up and store. ■ Store as sheets stacked in 100 x 100 cm/crrL size (■ and ■ are overlapped (wrapped) with polyethylene 100 μ film). Check the number of viable bacteria over time. did.

The initial number of bacteria for each 10X 10c++t (both sides) is 1.
It was 05 pieces.

The check results are shown in Table 3vc.

<Effects of the Invention> As described above, according to the present invention, the sterilization effect of packaging materials that have been previously sterilized is improved by storage, so there is no risk of secondary contamination (and packaging materials that have not been sterilized) One side is also sterilized during storage.This has the effect that, for example, in a food factory, etc., it can be used as is for food packaging without having to be sterilized again.

patent applicant Toppan Printing Co., Ltd. Representative Kazuo Suzuki

Claims (1)

[Claims] (1) A collection of packaging materials made by wrapping a roll of packaging material or stacked sheets of packaging material coated with a sterilizing agent uniformly on one side with a synthetic resin film.