JPS63232164A - Packaging material made of synthetic resin having deodorizing and freshness-holding function and manufacture thereof - 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 synthetic resin packaging material having deodorizing and freshness preserving functions and a method for producing the same, and the present invention relates to a synthetic resin packaging material having deodorizing and freshness preserving functions, and a method for producing the same. This invention relates to a synthetic resin packaging material that is superior and has good molding workability, and a method for producing the same.

[Conventional technology]

As is well known, packaging materials made from synthetic resins have been used in various fields. In this case, packaging films and containers used for fresh foods such as vegetables (9 g) and fish are generally considered to be strong.

In addition to barrier properties (in the case of film), stability, hygiene, economy, etc., in recent years, deodorizing functions have also been added.

Freshness preservation functionality is also required.

For this reason, research has been carried out on substances that have a deodorizing function of 9g degree retention, and among the usual deodorizing agents that retain 9g degree, a mixed powder of ferrous sulfate powder and sodium bicarbonate powder has a deodorizing ability of 9g degree. It has been found that this powder has excellent retention properties and is suitable, and research has been conducted to add and mix this mixed powder into a synthetic resin material and mold it into a synthetic resin packaging material.

[Problem that the invention seeks to solve]

Applicant Mizu is also one of the people who has been engaged in the above research, but he simply added and mixed a mixed powder of ferrous sulfate powder and sodium bicarbonate powder to a synthetic resin material, and created synthetic resin molded films and synthetic resin molded containers. There are the following problems with just molding.

That is, when mixing a specified substance that enables deodorization and freshness preservation into a synthetic resin material and expecting the desired deodorization and freshness preservation effects, it is necessary to mix a certain amount of the above substance into the synthetic resin material. However, the above-mentioned conventional technology uses only a mixed powder of ferrous sulfate powder and sodium bicarbonate powder as the substance that enables this deodorizing and freshness preservation effect, so the sodium bicarbonate is less effective against the synthetic resin. The mixing volume is relatively large, and the sodium bicarbonate itself has the property of producing a large amount of gas when heated. In addition, it has the property of being easily agglomerated. Therefore, ■ Because the amount of sodium bicarbonate in the synthetic resin material is relatively large, the amount of gas generated in the entire molding material during heating and kneading increases, making molding difficult.More specifically, better molding is required. Sodium bicarbonate is concentrated in certain localized areas, and the amount of gas generated per unit volume of the molding material is large in these localized areas, making molding difficult in this sense as well. ■Even if it were possible to form a film or a container, the above substances would be concentrated in certain areas and the amount mixed in other areas would be small. The freshness preservation effect is good, but the deodorization and freshness preservation effects of other parts are poor, and the material is uneven, making it impossible to obtain a material that can withstand use as a whole.

Therefore, the purpose of the present invention is to create a synthetic resin molded packaging material that has deodorizing and freshness preserving effects by using ferrous sulfate monosodium bicarbonate, which has relatively good deodorizing performance and retention performance, but does not generate gas. In order to prevent the absolute amount of sodium bicarbonate powder from becoming too large, other substances that have deodorizing and freshness-preserving abilities are mixed into the synthetic resin material. By keeping the mixing ratio relatively small, the overall amount of gas generated during molding heating is reduced and molding operability is improved. However, the new substance has the ability to widely disperse and stabilize the mixed powder of ferrous sulfate and sodium bicarbonate in synthetic resin materials without unevenly agglomerating. The aim is to improve the dispersibility of the powder and sodium bicarbonate powder in the synthetic resin material and the stability of the dispersion state, and to average the amount of gas generated in each part of the material, that is, to increase the amount of gas generated particularly locally. The purpose is to make molding easier without having to
Ferrous sulfate, sodium bicarbonate, and newly added substances are dispersed on average in each part, and as a result, each part exhibits deodorizing performance and freshness preservation performance uniformly. We provide the manufacturing method.

[Means 1 for solving the problem] In order to achieve the above object, the present invention has the following technical means. That is, the first invention of the present application provides a synthetic resin packaging material such as a film or container shape formed by mixing a synthetic resin material with a mixed powder of ferrous sulfate powder and sodium bicarbonate powder; The mixed powder of ferrous sulfate powder and sodium bicarbonate powder added to the resin material is further mixed with insoluble mineral powder, and the mixed powder is adjusted to have a fine particle size. Deodorizing, characterized by
It is a synthetic resin packaging material that has a g-retaining function.

Further, the second invention of the present application is to dry ferrous sulfate powder and sodium bicarbonate powder, mix them in an arbitrary weight ratio, add this mixed powder to a synthetic resin material, heat knead it, and then form a film. In a method for manufacturing a synthetic resin packaging material having deodorizing and g-retaining functions that is molded into a container shape; optionally further adding an insoluble mineral substance powder to the above mixed powder of ferrous sulfate powder and sodium bicarbonate powder. Synthetic resin packaging material with deodorizing and freshness preserving functions, characterized by adding and stirring the mixed powder in a proportion of This is the manufacturing method.

The ferrous sulfate in the above is Fe5Oa ・1 to 1.
Any of 5H20, Fe5Oa and 7H20 can be used, and sodium bicarbonate, NaHCO3, can be any of sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, and sodium bicarbonate. Examples of the above-mentioned insoluble mineral substances include zeolite, acid clay, china clay, bentonite, talc, sand, diatomaceous earth, and perlite. The acidic clay mentioned above is the same as what is called thin clay, and the white china clay is kaolin,
It is synonymous with kaolite, koryo clay, and china clay.

Talc is acidic magnesium metasilicate, steatite,
It is the same as and includes soapstone, talc, and talcum.

Further, as the synthetic resin, any moldable resin such as polyethylene, polypropylene, polystyrene, polyvinyl chloride, etc. can be used. The mixing ratio of the ferrous sulfate powder and the sodium bicarbonate powder in the above can be arbitrarily selected depending on the application and required performance, such as 1:9. Further, the mixing ratio of these mixed powders and the insoluble mineral substance powder can be arbitrarily selected, such as 8:2, depending on the application and required performance. Furthermore, the mixing ratio of the mixed powder of the above three substances and the synthetic resin material, 1 to 9 of the synthetic resin material,
It can be arbitrarily selected depending on the purpose and required performance.

However, as mentioned above, even if the mixing ratio of each component is arbitrary, in the synthetic resin packaging material of the present invention and its manufacturing method, ferrous sulfate and sodium bicarbonate are simply used to provide the necessary deodorizing and freshness preservation functions. This method does not use only the powder of the above powder, but also contains powder of an insoluble mineral substance as a substitute for a part of the powder. In other words, the amount of sodium bicarbonate is relatively reduced.

Now, regarding the particle size of each of the above substance powders, it is desirable that they be fine. That is, after mixing the insoluble mineral substance powder with the mixed powder of ferrous sulfate powder and sodium bicarbonate powder, the whole of these powders is at least The particle size is adjusted to 60 microns or less, preferably finer, but the fineness of the ferrous sulfate powder and sodium bicarbonate powder depends on the fluidity in the synthetic resin material during molding. This contributes to improving the uniformity of the deodorizing and freshness preservation functions.On the other hand, as for the particle size of the insoluble mineral powder, the finer the particle size, the greater the specific surface area. When iron powder and sodium bicarbonate powder are mixed and stirred into a synthetic resin and heated for molding, better dispersibility can be achieved and the dispersibility can be stabilized.

Furthermore, various machines such as a Henschel mixer or a tumbler blender can be used for mixing the above-mentioned powders and drying in the preliminary stage, and a suitable machine such as a pen or type extruder can also be used for the heating mixing machine. can be used. In addition, any method can be used for forming synthetic resin packaging materials, such as the inflation method for films and blow molding, injection molding, and sheet vacuum forming for containers. be.

Therefore, in the above manufacturing method, ferrous sulfate powder and sodium bicarbonate powder are mixed, insoluble mineral powder is mixed and stirred, and these are mixed into a synthetic resin material and kneaded by heating. Although the method of molding and forming a synthetic resin packaging material has been described, the synthetic resin packaging material (film, container) of the first invention of the present application is as follows.

It can also be implemented by the following method based on this method. That is, a mixed powder of ferrous sulfate powder and sodium bicarbonate powder is mixed and stirred with an insoluble mineral powder of zeolite, then mixed with a synthetic resin powder prepared in advance, and then heated and kneaded with an extruder or the like. The primary material is then molded into pellets or beads. This-
In the case of molding the next material, the amount of the mixed powder of these three is increased relative to the synthetic resin material. The next material created in this way is then added to and mixed with a normal synthetic resin material, heated and kneaded, and then molded, just like the previous one.
It can be a synthetic resin packaging material that has deodorizing and g-retaining functions.

〔Example〕

Next, embodiments of the present invention will be described in detail.

Example 1: See FIG. 1 The heptahydrate FeSO4.7H20 of ferrous sulfate powder 1 was thoroughly dried 2 using a rotary kiln dryer. On the other hand, the sodium bicarbonate powder 3NaHCO3 was sufficiently dried in a hot air circulating dryer4. Then, the ferrous sulfate powder and sodium bicarbonate powder were mixed in a weight ratio of 1=9, and this was dried at a low temperature without drying at a high temperature all at once. Zeolite powder 6 was then mixed 7 into these. That is, in terms of weight ratio, a mixed powder of ferrous sulfate powder and sodium bicarbonate powder is 8, and zeolite powder is 2, which are mixed 7 and 8, the particle size of these powders is adjusted to 5 microns, and low density polyethylene 9 (Toyo In addition, the above mixed powder was added in a weight ratio of 1 to 9 parts of polyethylene (10 days), mixed with 10 liters of polyethylene, and then heated and kneaded in 11 L, and molded into a packaging film with a thickness of 30 microns by the inflation method for 12 sheets. . The resulting packaging film 13 was subjected to the following test.

[Deodorizing effect test-■] ■Sample 50 samples of packaging film produced by the above method
X 200 m long (weight 0.24 g) was used.

■Test method Collect 10 mJ of 28% ammonia water into a 300 ml Erlenmeyer flask, and after completely gasifying it, put one sheet of the sample into the Erlenmeyer flask and store it at 25°C for a specified period of time. After the elapsed time, the residual concentration of ammonia in the Erlenmeyer flask was measured using a Kitagawa gas detector.

■Test results Ammonia deodorizing ability after 5 minutes e * * * 6,800 PPm after 30 minutes
...4,000 PP+w120 minutes later fist...-3,4
It was 00PPm.

[Deodorizing effect test-■] ■Sample 50X of packaging film sample made by the above method
200+ss+ (weight 0.28g) was used.

■Test method 1mM of 800 PPm sodium sulfide aqueous solution and 0.1mJl of 1N sulfuric acid are placed in a 300+JL Erlenmeyer flask to generate hydrogen sulfide, one sample is placed in the Erlenmeyer flask, and after a predetermined period of time, Kitagawa using a type gas detector.

The residual concentration of hydrogen sulfide in the flask was measured.

■Test results The deodorizing ability of hydrogen sulfide is 1 day later ΦΦ fist・80 PPm 3 days later・Φ・・30 PPm 7 days later...Φ・　I　PPm　　.

[Freshness retention test 1 ■Sample Packaging film made by the above method 2 (IOX 250 mm was used.

■Test method The items listed below were wrapped and stored in a refrigerator at 5°C for 6 days, after which the freshness was evaluated by a panel of 5 (2 men, 1 woman, 3 women).

(■Test results The test results are shown below in comparison with a conventional product. Here, the conventional product is a normal polyethylene packaging film.

Example 2 Diatomaceous earth was used as an insoluble mineral substance instead of the zeolite powder in the first example. Other numerical values and the like are the same as in Example 1. In this case as well, test 1
I got the following results.

[Deodorizing effect test-■] (Sample D: Sample of packaging film produced by the above method/115
0x200mm (weight 10-24g) was used.

■Test method Collect 10ml of 28% ammonia water into a 300mM Erlenmeyer flask, and after gasifying it completely, put one sheet of the sample into the Erlenmeyer flask and store it at 25℃ for a specified period of time. After the elapsed time, the residual concentration of ammonia in the Erlenmeyer flask was measured using a kita type gas detector.

■Test results The deodorizing ability of ammonia is as follows: After 5 minutes ・ ・ ・ Pot ill, 800 Pρ■
30 minutes later II+1--4.2002PI1120 minutes later・
- Fist: 3,500 PPm'.

[Deodorizing effect test-■] ■Sample Packaging film sample 5QX produced by the above method
200a+v (weight 0.24g) was used.

■Test method Put 1ml of 800 PPs sodium sulfide aqueous solution and 0.1+fL of 1N sulfuric acid into a 300m1 Erlenmeyer flask to generate hydrogen sulfide, put one sheet of the sample into the Erlenmeyer flask, and after a predetermined period of time, The residual concentration of hydrogen sulfide in the flask was measured using a north-side gas detector.

■Test results The deodorizing ability of hydrogen sulfide is 1 day later...Φ・80 PPm 3 days later...@30PP■ 7 days later, fist, φ3 PPm.

Comparative Example 1 Conventional polyethylene film sample 50 x 200
mm (weight 0.24 g) and a sample 50X 20 (m (J
iIO, 25g), and a sample of polyethylene mixed with only zeolite powder 50X 200 layers (weight 0
．． The ammonia and hydrogen sulfide deodorizing ability values of 24 g) are shown below.

The test method was the same as in Examples 1 and 2 for comparison.

[Deodorizing ability of ammonia-PPm-] [Deodorizing ability of hydrogen sulfide-pp■-] Example 3 Ferrous sulfate powder and sodium bicarbonate powder at a weight ratio of 1:9
Then, zeolite powder was added to this mixed powder at a weight ratio of 4:1.

The particle size was adjusted to 5 microns. On the other hand, low density polyethylene (manufactured by Toyo Soda Kogyo Co., Ltd., product name Vetrocene 180) was adjusted to a particle size of 200 mesh, and 70 parts by weight of this polyethylene was added, thoroughly mixed with a Henschel mixer, and a bent type extruder
The mixture was heated and kneaded to produce synthetic resin pellets.

Thereafter, this pellet was mixed with natural resin and molded into a packaging film. In the case of this example as well, remarkable deodorizing ability and freshness preservation function were observed compared to conventional products.

〔Effect of the invention〕

As detailed above, according to the present invention, an insoluble mineral powder is added to a mixed powder of ferrous sulfate powder and sodium bicarbonate powder. Therefore, in order to maintain a predetermined deodorizing ability of 9g at#, the absolute amount of sodium bicarbonate can be reduced. This is because an insoluble mineral powder, which itself has deodorizing and freshness preserving functions, is mixed instead.

As a result, the absolute amount of gas generated from sodium bicarbonate during heating for molding can be reduced, and molding operability is improved, that is, degassing operations for obtaining high quality are facilitated. Furthermore, by adding powder of an insoluble mineral substance, sodium bicarbonate, which is naturally prone to agglomeration, can be widely dispersed in the synthetic resin material and its dispersibility can be stabilized. Sodium bicarbonate is not mixed unevenly, and the amount of sodium bicarbonate mixed per unit volume of the material is averagely dispersed and small, so in this sense as well, the amount of gas generated can be kept low. Moreover, since the insoluble mineral substance powder has a large specific surface area, the above-mentioned dispersion performance is extremely good.

For these reasons, ferrous sulfate and sodium bicarbonate, which have the ability to deodorize and maintain freshness, are equally dispersed in each part of the formed film or synthetic resin packaging material in the form of a container. will be better demonstrated.

[Brief explanation of drawings]

The accompanying drawing is a flow sheet showing an example of the manufacturing method of the present invention.

Claims (6)

[Claims] (1) In synthetic resin packaging materials such as films and containers formed by mixing a mixed powder of ferrous sulfate powder and sodium bicarbonate powder with a synthetic resin material; The above-mentioned mixed powder of ferrous sulfate powder and sodium bicarbonate powder is further mixed with an insoluble mineral substance powder, and the mixed powder is adjusted to have a fine particle size. ,
Synthetic resin packaging material with freshness preservation function. (2) Deodorization according to claim 1, wherein the insoluble mineral substance powder is zeolite powder;
Synthetic resin packaging material with freshness preservation function. (3) The synthetic resin packaging material having deodorizing and freshness preservation functions as set forth in claim 1, wherein the packaging material is a packaging film. (4) The synthetic resin packaging material having deodorizing and freshness preserving functions as set forth in claim 1, wherein the packaging material is in the shape of a container. (5) After drying ferrous sulfate powder and sodium bicarbonate powder, mix them in any weight ratio, add this mixed powder to a synthetic resin material, heat knead it, and then mold it into a film or container shape. In the method for producing synthetic resin packaging materials with deodorizing and freshness preservation functions: Add insoluble mineral powder in any proportion to the above-mentioned mixed powder of ferrous sulfate powder and sodium bicarbonate powder, and mix and stir. A method for producing a synthetic resin packaging material having deodorizing and freshness preservation functions, which comprises finely adjusting the particle size of these mixed powders and then mixing the mixed powder with a synthetic resin material in an arbitrary ratio. (6) Deodorization according to claim 5, characterized in that the insoluble mineral substance powder is zeolite powder;
A method for manufacturing synthetic resin packaging materials with freshness preservation function.