JPS6374449A - Packaging material for preventing occurrence of stored grain insect pest - Google Patents

Abstract

PURPOSE:To obtain a packaging material capable of preventing occurrence of insect pests in grains during storage and providing observation of the contents from the outside, by constituting the packaging material of an at least partially light-transmitting plastic film containing a pearlescent pigment kneaded therein. CONSTITUTION:A packaging material consisting of an at least partially light- transmitting plastic film obtained by kneading 0.1-20wt% pearlescent pigment, e.g. titanium oxide-coated mica, basic lead carbonate, bismuth chloride, etc., therein. Although the titanium oxide-coated mica, basic lead carbonate, bismuth chloride, etc., are cited as the pearlescent pigment used, the titanium oxide- coated mica pigment prepared by coating the surface of scaly mica flakes with fine particulate titanium oxide is preferred because of no toxicity. Polyethylene is particularly preferred as the plastic material for forming the film. If the amount of the pearlescent pigment blended is too small, no effect is obtained. Conversely, it the amount is too much, the film becomes opaque. Thereby the amount within the range of 1-5wt% is particularly preferred.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a packaging material that can prevent pests from infesting grains during storage.

It is well known that grains, especially rice, are susceptible to damage from insects such as brown elephants during storage. These pests lay their eggs on the raw powder at the time of harvest, and if conditions such as light, temperature, and humidity are right during storage, the eggs transform into larvae, and eventually become adults and reproduce. Therefore, the eggs of these pests are always laid in the powder, and if the environment is conducive to growth, these pests will appear in the powder and the milled rice processed from it.

Light-transparent plastic films such as polyethylene have come to be used as packaging materials for grains, especially polished rice. For example, this product is widely used as a packaging material for milled rice because it allows consumers to observe the contents without opening the bag. Even in grains packaged in such light-transmitting plastic film bags, pests such as the brown elephant will appear if the environment is suitable for growth as described above. For this reason, rice retailers are equipped with refrigerators and store grain in plastic bags at all times. If you use a container that does not transmit light, such as a paper bag, pests will be less likely to occur even when stored at room temperature compared to polyethylene film bags, but it will not be possible to observe the contents without tearing the package, and There are inconveniences such as the inability to close the mouth with a seal.

Therefore, the present inventors developed a material that is light-transparent so that the contents can be observed from the outside, but which, like light-opaque materials, can prevent pest infestation even when stored in pest-prone conditions. After searching for packaging materials, they found that plastic films such as polyethitane with pearlescent pigments were suitable for this purpose.

Therefore, the present invention provides a packaging material for grain storage consisting of an at least partially light-transparent plastic film incorporating 0.1 to 20% by weight of a pearlescent pigment such as titanium mica, basic lead carbonate, or bismuth chloride. provide.

Pigments that produce pearl-like luster due to light interference phenomena are used, for example, in the production of artificial pearls. Titanium mica, basic lead carbonate, bismuth chloride, and the like are known as pearlescent pigments, but titanium mica pigments, which are made by coating the surface of scale-like mica flakes with fine particles of titanium oxide, are preferred because they are nontoxic.

The plastic material forming the film may be any plastic that is inherently transparent and flexible. Examples include plasticized polyvinyl chloride, polyethylene, polypropylene, polyester, etc. Polyethylene is particularly preferred.

If the amount of the pearlescent pigment is too small, the effect will be ineffective, and if it is too large, the film will become opaque, so the appropriate amount is generally 0.1 to 20% by weight, particularly 1 to 5% by weight.

Although the above blending amount is for direct inking into the film, the purpose can also be achieved by applying a paint containing pearlescent pigment in an amount corresponding to that in solid bone to a film that does not contain pearlescent pigment.

The packaging material of the present invention is generally processed into bags and used,
Other forms can also be used.

In addition, grains include rice, barley, wheat, buckwheat, and their flours, beans, coffee beans, koshiyo, etc.
Pests are not limited to beetles such as the black elephant, but also include insects belonging to the order Lepidoptera, mites, etc.

In order to confirm the effectiveness of the packaging material of the present invention in preventing pest outbreaks, the following experiment was conducted.

A polyethylene bag kneaded with 2% by weight of titanium mica pigment (TP-690 manufactured by Teikoku Kako ■) and a polyethylene bag containing no titanium mica pigment as a control were prepared.

These polyethylene bags were simultaneously filled with polished rice polished using a rice milling machine and heat-sealed.

Five test bags and five control bags were randomly stored in a bright room at room temperature. The test was conducted during the summer.

After one week, the bags were opened and inspected with the naked eye for the appearance of adult black elephants and gray whales. Although no pests were observed in the milled rice stored in polyethylene bags containing titanium mica, In the polished rice packaged in the control polyethylene bag without the fertilization, large numbers of gray elephants and gray whales were observed.

After a further three months, the bag containing the titanium mica was opened, but no adult moths of K. kokusai or K. kokukushi were observed.

Dear Commissioner of the Patent Office, December 1, 1986
, Indication of the case Patent Application No. 221215 of 1985 2, Name of the invention Packaging material for preventing the occurrence of stored grain pests 3, Person making the amendment Relationship to the case Name of the patent applicant Teikoku Kako Co., Ltd. 4, Agent voluntary Contents of the amendment 1. Insert the following between page 4, line 12 and line 13 of the specification.

Claims (1)

[Claims] A packaging material for grain storage comprising an at least partially light-transparent plastic film into which 0.1 to 20% by weight of a pearlescent pigment such as titanium mica, basic lead carbonate, or bismuth chloride is kneaded.