JPH0433307B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a packaging film characterized by containing an antifogging agent and a synthetic zeolite. To provide a packaging film which can be preserved and has an excellent effect of preserving the freshness of fruits and vegetables. [Prior Art] In order to preserve freshness by preventing ripening and aging of fruits and vegetables during transportation or storage, fruits and vegetables have traditionally been placed in cardboard boxes or plastic containers, or wrapped in plastic film. ,
Transport and storage at low temperatures is commonly practiced. In addition, recently, Japanese Patent Publication No. 56-42888, Japanese Patent Publication No. 56-144048, Japanese Patent Publication No. 58-193678, Japanese Patent Publication No. 1988-
209934, JP-A No. 60-94056, etc., gas adsorbents, moisture absorbers, gas decomposers, etc. are sealed in air-permeable pouches, which are packaged and stored together with fruits and vegetables when packaging them. However, a simple method has been proposed that adjusts the oxygen gas concentration, carbon dioxide gas concentration, moisture, etc. inside the packaging container or packaging bag, or adsorbs and removes ethylene gas, which promotes the ripening of fruits and vegetables, and has attracted attention. ing. [Problems to be solved by the invention] However, transportation and storage at low temperatures requires large-scale equipment, high costs, and is inconvenient to handle.
There is a problem in that phenomena such as low temperature damage are observed.
In addition, the method of enclosing gas adsorbents in small bags and packaging them together with fruits and vegetables, which has been attracting attention recently, requires preparing each type of small bag, and in some cases, several small bags may be packed at the same time. There are problems such as the need for packaging and storage, which makes the packaging work complicated and time-consuming. [Means for Solving the Problems] As a result of intensive studies by the present inventors to solve the above problems, we found that either an antifogging agent and synthetic zeolite are added and kneaded into a synthetic resin, or the antifogging agent is adsorbed on silica. The present inventors have discovered that an excellent freshness retention effect can be obtained by packaging fruits and vegetables with a synthetic resin film obtained by adding and kneading zeolite and synthetic zeolite to a synthetic resin, and have arrived at the present invention. That is, the present invention provides a packaging film for fruits and vegetables made of a synthetic resin to which 0.1 to 5.0% by weight of an antifogging agent with a melting point of 40°C or lower and 3 to 20% by weight of synthetic zeolite type X is added.
Excellent freshness retention can be obtained simply by wrapping fruits and vegetables with the film of the present invention. The synthetic zeolite used in the present invention includes SiO ₂
Synthetic zeolite type X, which has a molar ratio of 2.4 to 2.8 between Al 2 O 3 and Al ₂ O ₃ , has a higher silica content than type A, and has a pore diameter of 9 to 10 Å, has excellent selective adsorption ability for various compounds.
preferable. The amount of synthetic zeolite added to the film of the present invention is 3 to 20% by weight. If it is less than 3% by weight, the effect is small, and if it is more than 20% by weight, there are problems such as poor appearance of the film, decrease in strength of the film, and easy breakage during film formation. The antifogging agents used in the present invention include polyhydric alcohol fatty acid esters, alkylene oxide adducts of polyhydric alcohol fatty acid esters, higher aukol alkylene oxide adducts, polyoxyalkyl phenol ethers, and polyoxyalkenyl phenol ethers. can be given. These may be used alone or in combination of two or more. It can also be used by adsorbing it onto silica. Here, the polyhydric alcohol of the polyhydric alcohol fatty acid ester refers to ethylene glycol, propylene glycol, butanediol, glycerin, polyglycerin, polyethylene glycol, pentaerythritol, trimethylolpropane, sorbitan, sorbitol, sucrose, etc. refers to fatty acids with 2 to 22 carbon atoms such as acetic acid, butyric acid, caproic acid, caprylic acid, capric acid, lauric acid, palmitic acid, stearic acid, oleic acid, linoleic acid, linolenic acid, ricinolenic acid, and erucic acid. Mixed fatty acids such as , coconut oil, palm oil, soybean oil, cottonseed oil, beef tallow, chicken tallow, and fish oil are also used. Further, the higher alcohol alkylene oxide adduct is a product obtained by adding 2 to 30 moles of ethylene oxide, propylene oxide, etc. to a saturated or unsaturated alcohol having 10 to 20 carbon atoms. Among these antifogging agents, those with a melting point of 40°C or lower are preferable because the film surface is less cloudy due to the antifogging agent that bleeds onto the film surface and has good transparency. It is particularly preferable to use the antifogging agent by adsorbing it on silica in advance, since this has the effect of suppressing the antifogging agent from bleeding onto the film surface and preventing the antifogging agent from scattering. The amount of these antifogging agents added to the film of the present invention is 0.1 to 5.0% by weight, preferably 0.3 to 2.0% by weight.
It is. If it is less than 0.1% by weight, the effect is insufficient, and if it is more than 5% by weight, the film surface becomes too sticky and the opening of the bag becomes difficult, which is not preferable. Examples of the synthetic resin used in the film of the present invention include polyethylene polypropylene, ethylene-vinyl acetate copolymer, ethylene-butylene copolymer, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, polystyrene, and polyester. The method for producing the film of the present invention includes an antifogging agent,
Alternatively, the antifogging agent adsorbed on silica, synthetic zeolite, and synthetic resin are mixed at a predetermined concentration in a mixer such as a tumbler, and the mixture is formed using ordinary molding methods such as inflation processing, T-die processing, and calender processing. Either by processing the mixture into a film using a processing method, or by kneading the mixture at the predetermined concentration using a Banbury kneader, single-screw or multi-screw type kneader, etc., and adding the antifogging agent and synthetic zeolite. A method of uniformly kneading and dispersing a synthetic resin and molding it into a film using the above-mentioned normal molding method;
Alternatively, the antifogging agent and synthetic zeolite are mixed with a synthetic resin so that the concentration is higher than the predetermined concentration, kneaded with the above-mentioned kneading machine, etc. to make a masterbatch, and then a new synthetic resin is added, Examples include a method of diluting it to a predetermined concentration and molding it into a film using a normal molding process. Furthermore, additives such as lubricants, antioxidants, and anti-blocking agents may be added to the film of the present invention, if necessary. [Function] The film of the present invention contains an antifogging agent and a synthetic zeolite that are uniformly dispersed and mixed, preventing water droplets from adhering to it and efficiently adsorbing and removing ethylene gas, which is a ripening hormone for fruits and vegetables. can be suppressed. In other words, by mixing synthetic zeolite with an antifogging agent, which can control the ingredients, composition, and pore diameter, and can provide uniform and stable quality, instead of using natural zeolite, the antifogging agent's surfactant effect is also added. Synthetic zeolite is uniformly dispersed in the film, resulting in a film that is free from adhesion of water droplets and has excellent adsorption properties for ethylene gas. or,
By uniformly dispersing synthetic zeolite,
The transparency and appearance of the film are very good. [Effects] When vegetables, fruits, and other fruits and vegetables are packaged with the film of the present invention, water droplets do not adhere to them, and ethylene gas, which promotes the ripening of fruits and vegetables, is adsorbed and removed. It is also possible to prevent ripening and aging from being accelerated by the action of ethylene gas, and fruits and vegetables can be stored for a long time without losing their freshness. Products packaged with the film of the present invention can be transported from the production area to the market without the use of refrigerators, refrigerated trucks, etc., with little loss of freshness and without lowering the product value. In addition, when the film of the present invention is used for fruits and vegetables stored in ordinary households, they can be preserved for a long period of time and can be consumed without waste. [Examples] The present invention will be specifically explained below using Examples. Example 1 70 parts by weight of low density polyethylene and synthetic zeolite
13X, 25 parts and diglycerin monooleate ester, 5 parts as an antifogging agent, are kneaded in a twin-screw type mixer to produce a masterbatch.
Furthermore, 20 parts of this masterbatch and 80 parts of low density polyethylene were mixed in a tumbler, and a film with a thickness of 30 μm was produced by an inflation method. Furthermore, a film was produced in the same manner using synthetic zeolite 3A instead of the synthetic zeolite 13X (Comparative Example-6).On the other hand, as a comparative example, low-density polyethylene alone (comparative example-1) and low-density polyethylene 75 parts and synthetic zeolite 13X25
20 parts of this masterbatch and 80 parts of low-density polyethylene were mixed in a tumbler (Comparative Example-2), and a synthetic zeolite 13X was used instead of the synthetic zeolite 13X. Zeolite 3A was mixed with low density polyethylene in the same manner (Comparative Example 3) and a film was produced by the inflation method. Fresh shiitake mushrooms were filled and packaged in each of the films mentioned above, air-tightly sealed and stored at room temperature (16-21°C), and the freshness retention effect was compared based on changes in appearance (color) and odor (aroma). The results are shown in Table 1. As shown in Figure 2, the film of the present invention exhibits excellent effects.

【table】

[Table] Comparative example 3
Examples 3, 4, 5 40 parts of 5 mole ethylene oxide adduct of lauryl alcohol adsorbed on 60 parts of silica15
24 parts of synthetic zeolite 10 Thickness by inflation method
A 30μ film was produced (Example 3). or,
Also 25 parts of masterbatch and low density polyethylene
175 parts were similarly mixed in a tumbler, and a film with a thickness of 30 μm was produced by the inflation method (Example 4). Further, 7.5 parts of the above antifogging agent adsorbed on silica, 12 parts of synthetic zeolite 10X, and 380.5 parts of polyvinylidene chloride resin were mixed uniformly in a tumbler, and then mixed using an inflation method using a steam-heated extruder. A film with a thickness of 30 μm was produced (Example 5). Examples of the present invention-3, 4, 5
Apples were air-tightly packaged with each film and a low-density polyethylene film (Comparative Example-4) and a polyvinylidene chloride film (Comparative Example-5) as comparative examples, and stored at room temperature (16 to 21°C). , we tested the freshness preservation effect by looking at changes in the appearance, taste, and aroma of apples. The results are shown in Table-2. The film of the present invention shows excellent effects.

【table】

[Table] Examples 6 and 7 20 parts of sorbitan lauric acid ester and 30 parts of polyoxyethylene 5-nonylphenol ether were mixed and adsorbed on 50 parts of silica, 4 parts, synthetic zeolite 13X, 7 parts, and low density polyethylene 89 The mixture was extruded and kneaded using a screw-type twin-screw mixer and processed into pellets, which was then processed into a film with a thickness of 30 μm using the usual inflation method (Example-
6). In addition, polypropylene was used instead of the low-density polyethylene and extruded and kneaded in the same manner using a twin-screw mixer, processed into pellets, and a film with a thickness of 30 μm was produced by a water-cooled inflation method ( Example-7). Broccoli was airtightly packaged using each of the films of Examples 6 and 7, individual films of low density polyethylene and polypropylene as comparative examples, and films mixed with 7% by weight of synthetic zeolite 13X, and placed in a refrigerator (5 to 6 ℃), and compared the number of days until the broccoli changes color from fresh green to yellow and develops a strange odor.The broccoli wrapped with the film of Example 6 and the film of Example 7 showed that 9 days had elapsed. However, yellowing and odor were observed from the 4th day on the films made of low density polyethylene and polypropylene alone, and when 7% by weight of synthetic zeolite 13X was mixed in. The low-density polyethylene and polypropylene films were also observed to yellow and develop a strange odor from the 5th day onwards. The film of the present invention mixed with an antifogging agent and synthetic zeolite showed very great effects.

Claims (1)

[Claims] 1. A packaging film for fruits and vegetables made of a synthetic resin to which 0.1 to 5.0% by weight of an antifogging agent having a melting point of 40°C or less and 3 to 20% by weight of synthetic zeolite type X are added. 2. The antifogging agent with a melting point of 40°C or less is selected from polyhydric alcohol fatty acid esters, alkylene oxide adducts of polyhydric alcohol fatty acid esters, higher alcohol alkylene oxide adducts, polyoxyalkyl phenol ethers, and polyoxyalkenyl phenol ethers. The packaging film for fruits and vegetables according to claim 1, characterized in that it has a melting point of 40°C or less.