JPH0257562A - Cereals bag against insect and mold - Google Patents

Abstract

PURPOSE:To prevent harmful insects and mold and also prevent loss, contamination, deterioration, rot, etc. of contained cereals, by using a thermoplastic resin film including specified volume of inorganic filler and anti-mold reagent and also using the film having air holes smaller than the sereals and the harmful insects. CONSTITUTION:This sereals bag against harmful insects and mold is made of a thermoplastic resin film including 0.5-30wt.% of inorganic filler and 10 ppm-30wt.% of anti-mold reagent and also has air holes smaller than the sereals and the harmful insects. The quantity of the above inorganic filler is decided according to the thickness of the film finally formed, but it is preferable within 0.6-20wt.% in case of about 20-50mum of the film thickness and within 0.5-13wt.% for about 50-500mum. For anti-mold reagents, inorganic or organic compounds with anti-mold or anti-bacteria nature are available and those mixtures are available as well.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is an insect-proof and mold-proof bag for grains used for storing, transporting, and distributing grains, particularly for preventing loss of grains due to feeding by pests, and for preventing molds. This invention relates to insect-proof and mold-proof bags for grains to prevent contamination, deterioration, rot, etc. of grains due to increased area.

[Conventional technology]

BACKGROUND ART Conventionally, as bags for grains such as rice, bags made of a thermoplastic resin film such as polyethylene and having air circulation holes that do not allow grains to pass through have been used.

On the other hand, conventional methods for controlling pests include using pesticides such as pest repellents and insecticides, trapping pests using adhesive tape containing pheromones that have the effect of attracting pests, and vegetables. When cultivating crops such as flowers, fruit trees, etc. in greenhouses or tunnels, UV rays of specific wavelengths are reflected to increase soil temperature to promote the growth of cultivated crops and to control flying pests. A method using a pest control film containing mica coated with titanium oxide particles (Japanese Unexamined Patent Publication No. 107737/1983) is known.

However, since the conventional grain bags are open with air circulation holes, there is a problem in that pest insects such as cartilage insects can enter and consume the stored grains. If the air circulation holes were made smaller to prevent this, there was a drawback that the air circulation would be poor and mold would be more likely to grow. In particular, rice can maintain its good taste if stored in a high moisture state, but currently rice is stored with a reduced moisture content to prevent the formation of mold.

In addition, in the case of thermoplastic resin bags that do not contain inorganic fillers,
Air circulation holes expand due to chewing, scratching, etc. of pests.
There was a problem in that it was easy for pests to invade.

Furthermore, even if a commonly used pest control method is applied to grain bags, there are problems in terms of safety, pest control effectiveness, etc. For example, methods that use pesticides can cause contamination of grains,
There is a problem of toxicity to humans and livestock, and methods using adhesive tapes do not have sufficient control effects, and pest repellents and the above-mentioned insect repellent films are affected by the type of pest and light, so it is difficult to prevent pests when storing and preserving grains. Control effect is insufficient. Especially for grains such as rice, wheat, red beans, corn, and millet.

The brown weevil causes the most damage, but the application of these conventional methods to grain bags does not yield satisfactory results.

[Problem to be solved by the invention]

The purpose of the present invention, in order to solve the above-mentioned problems, is to prevent the invasion of insect pests such as cartilage beetles, as well as the generation of mold, thereby reducing the loss, contamination, deterioration, rot, etc. of stored grains. To provide an insect-proof and mold-proof bag for grains which can prevent insects and molds and preserve grains in a fresh state.

[Means to solve the problem]

The present invention consists of a film of a thermoplastic resin composition containing 0.5 to 30% by weight of an inorganic filler and 10 ppm to 30% by weight of a fungicide, and has air circulation pores smaller than grains and pests. This is an insect-proof and mold-proof bag for grain.

Examples of inorganic fillers used in the present invention include heavy calcium carbonate, light calcium carbonate, kaolin, clay, bentonite, titanium oxide, magnesium hydroxide, talc, and zeolite.

Mica, magnesium carbonate, calcium silicate, antimony oxide, diatomaceous earth, alumina, barium sulfate, waxite, silica balloon, shirasu balloon, titanium oxide coated mica, silver coated zeolite, silver coated mica, gold coated zeolite, gold coated mica, tin coated Mica, metal powder, ceramic powder, mixtures thereof, and the like can be used.

The particle size of these inorganic fillers is not particularly limited as long as it does not affect film forming, but is generally between 0.01 and 1.
The amount of these inorganic fillers contained in the film is determined in relation to the thickness of the film that is finally formed.
-For boat fishing 065-30% by weight, film thickness about 20%
0.6 to 20% by weight if the film thickness is about 50 μm, and 0.5 to 13% by weight if the film thickness is about 50 to 500 μm.

The antifungal agent may be an inorganic compound or an organic compound with antifungal or antibacterial properties, or a mixture thereof. Examples of these include mica coated with titanium oxide, zeolite coated with silver, etc. , silver-coated mica, gold-coated zeolite, gold-coated mica, tin-coated mica, thiabendazole (TBZ: 2-(4-thiazo-IJ/
L/)-1H-benzimidazole), N-(fluorodichloromethylthio)phthalimide, N-dimethyl-N
'-Phenyl-N' (fluorodichloromethylthio)sulfamide, 0-phenylphenol, chlorhexidine, 1,2-penzisothiazurin-3-one-10,
10'-oxybisphenoxazine, 2,4,5.6-
Examples include titrachloroisophthalonitrile and mixtures thereof. The content of these antifungal agents is determined in the range of 10 ppm to 30% by weight depending on their respective activities.

Among the above agents, titanium oxide coated mica, silver coated zeolite, silver coated mica, gold coated zeolite, gold coated mica,
Tin-coated mica and the like can be used both as an inorganic filler and as a fungicide.

The thermoplastic resin used in the present invention is not particularly limited, but includes low density polyethylene, high density polyethylene, ethylene/acrylic acid copolymer, ethylene/methyl methacrylate copolymer, ethylene/vinyl acetate/methyl methacrylate copolymer. , ethylene polymers such as ethylene/butene-1 copolymer, and ethylene/4-methylpentene-1 copolymer; propylene polymers such as polypropylene and maleic acid-modified polypropylene; vinyl chloride resin; mixtures thereof, etc. Can be used.

The insect-proof and mold-proof bag for grains of the present invention is made from a film of the thermoplastic resin composition containing the above-mentioned inorganic filler and mold-proofing agent, and has air circulation holes large enough to prevent grains and pests from passing through. It has the following.

The air flow particle holes may be of any shape such as a cut-out shape or a notch shape. As for the shape of the cutout.

Any shape may be used, such as a circle, a semicircle, an oval, an oval, a triangle, a square, a pentagon, a hexagon or more, and a star. In the case of notch shape, the shape is T-shape 0, L-shape, T-shape.
Examples include any shape consisting of one or more straight lines or curves, such as Y-shape, Y-shape, 10-shape, -shape, and C-shape.

The size of the air circulation hole varies depending on the type of grain and insect pest, but when targeting rice and ground insects, and in the case of a cutout shape, the major axis (longest diagonal line) should be 0.01~
1mm+, preferably 0.05 to 0.8mm, in the case of a notch shape and the length of one straight line.

Further, when two or more lines intersect, the maximum length of the straight line or broken line is preferably 0.5 to 4 mm, preferably 2 to 3.5 mm. The number of air circulation holes is not particularly limited, but may be up to 10.
Approximately 1 to 20 pieces per 0 d is preferable.

The grains to be stored in the present invention include grains that are generally stored in grain bags, such as rice, barley, wheat, buckwheat, soybeans, adzuki beans, coffee beans, and koshiyo. In addition, as pests, there are beetles such as black elephants, insects belonging to lepidoptera, etc.
Includes the general pests that parasitize the above grains.

The insect-proof and mold-proof bag for grains of the present invention can be manufactured by the following steps. First, a thermoplastic resin composition containing an inorganic filler and a fungicide is prepared by a Banbury mixer, a pressure kneader, a two-roll mixer, a single or twin-screw extrusion mixer, or a disc-type continuous kneading extruder. It can be obtained by supplying the inorganic filler and the fungicide while melting the thermoplastic resin using a machine or the like, and cross-mixing the thermoplastic resin. The inorganic filler and anti-mold agent are prepared using a Henschel mixer,
They may be mixed using a super mixer, a high-speed stirrer, or the like, or a mixture of these and a thermoplastic resin may be cross-mixed.

The thermoplastic resin composition thus obtained can be formed into a film using a conventional film processing machine such as T-die film processing, blown film processing, or calendar processing, and then fused to form a bag. The air circulation holes in the form of cutouts or notches can be easily formed in the bag thus obtained by punching the bag using a conventional punching machine.

Air ventilation holes are necessary to maintain the freshness of the grain stored inside and improve mold-proofing properties, and if there are no air ventilation holes, it may encourage the growth of mold or the freshness of the grain inside may deteriorate. , the taste is reduced. The size of the air circulation holes is determined in relation to the thickness of the film, but in the case of a normal film, it can be arbitrarily determined within the above range.

[For production]

The insect-proof and mold-proof bag for grains of the present invention stores grains such as rice and wheat inside, closes the opening by heat sealing, etc., and is used for storing, transporting, and distributing grains. This insect-proof and mold-proof bag for grain is
It has air circulation holes that are smaller than the grains and the pests that parasitize them, such as the small insects, so they prevent the invasion of pests and ensure air circulation to maintain the freshness of the grains inside and improve mildew resistance. Demonstrate the functions of Also, since it contains an inorganic filler, the film becomes hard and prevents pests such as carpenter beetles from chewing through the bag, expanding the air circulation holes, and invading the inside of the bag. Furthermore, the anti-mold agent prevents the growth of mold and maintains the freshness of the grain. In addition, since it prevents the invasion of grain insects, it also has the function of preventing the reproduction and multiplication of molds, mites, and other stored grain pests caused by the excrement of grain insects, and also prevents deterioration and rot of grain.

〔Effect of the invention〕

The insect-proof and mold-proof bag for grains of the present invention is made of a film of a thermoplastic resin composition containing an inorganic filler and a mold-proofing agent, and has air circulation holes smaller than grains and pests, so it prevents pests from entering, and It prevents the growth of mold, thereby preventing grain loss, contamination, deterioration, spoilage, etc., and maintains freshness. In particular, it can be used to preserve rice with a high moisture content, so it can prevent the taste of rice from deteriorating over a long period of time.

〔Example〕

The present invention will be explained below with reference to Examples and Comparative Examples.

Example 1 Low density polyethylene (melt index: 2) 100
Parts by weight, 25 parts by weight of heavy calcium carbonate (NCC-V2O3, average particle size 1.48μ, Nitto Funka Kogyo ■!I),
0.5 parts by weight of calcium stearate was mixed in advance with a Henschel mixer (FM-75J, fil manufactured by Mitsui Miike Seisakusho), and this mixture was mixed with a continuous kneading extruder (KCK).
, 80x2-35VEX (6), (manufactured by KCK) were melt-kneaded at a temperature of 200°C, and strands were cut to obtain granulated pellets.

A mixture of 10 parts by weight of the granulated pellets, 90 parts by weight of low-density polyethylene (melt index: 0.8), and 1000 ppm of the fungicide thiabendazole (TBZ) was mixed using a blown film processing machine (TOMY). A film with a thickness of 80 μm was obtained using a melting zone of 182°C and a die temperature of 180°C, and this was fused to obtain a bag with a length of 25 mm and a width of 15 aa. A total of 12 air circulation holes were installed in the form of five circular cutouts. One cup of brown rice (moisture 20%) was placed in this bag, the upper part of the bag was fused and bound, and two of these bags were prepared, and the insect repellent effect and mold repellent property of each bag was examined using the following test method.

Put a bag of brown rice in a glass container and add 30
The small elephants were placed in this glass container, and air holes were made at the top of the glass container with a wire mesh to prevent the small elephant insects from escaping.After two weeks, the bag was removed and the small elephant insects inside the bag were removed. The number of wards was counted.

A bag containing brown rice was placed in a mold-proof constant temperature constant temperature machine (L) I-20 (manufactured by Nagano Kagaku ■), kept at a temperature of 30°C and a relative humidity of 80%, and left for two months. The brown rice was taken out, and the growth potential of mold was visually determined and evaluated on the following four scales.

1: No growth of mold was observed and no discoloration.

2... There is very little growth of mold, and there is almost no discoloration.

3...Mold growth is observed and discoloration is observed.

4... There is significant growth of mold and significant discoloration.

Examples 2 to 5 Bags were manufactured in the same manner as in Example 1 by changing the types and amounts of the inorganic filler and anti-mold agent as shown in Table 1, and were similarly tested for insect repellent effect and anti-mold property. went.

Comparative Examples 1 to 3 Bags were manufactured in the same manner as in Example 1, and tests were conducted with bags without air holes and with different sizes of air holes.

Comparative Example 4 A bag similar to Example 1 was manufactured using only low-density polyethylene containing no inorganic filler and tested.

Comparative Examples 5 to 6 In Example 1, a bag containing no antifungal agent and a bag containing no inorganic filler or antifungal agent were manufactured, and the latter was subjected to a similar test without providing air circulation holes.

Comparative Example 7 Bags were manufactured in which the amount of zeolite added and the thickness of the bags were changed in Example 2, and the same tests were conducted.

Example 6 A bag was manufactured using ethylene/butene-1 copolymer instead of low density polyethylene and tin-coated mica as the inorganic filler in Example 1, and the same tests were conducted.

Comparative Examples 8 to 9 Bags were manufactured using titanium oxide-coated mica in Example 1, varying the amount added and the size of the air circulation holes, and the same tests were conducted.

The above results are summarized in Table-1.

The condition of the air circulation hole after the test is that the inorganic filler is 2.0
In the example containing 0.5% by weight of the inorganic filler, the area around the pores was slightly discolored due to scratching, etc., but the pore size was the same as before the test. In the case of (including), the pores were chewed off and expanded, and even in the case where no air circulation holes were provided (Comparative Example 6), the pores remained open and small insects were able to invade.

Examples 7 to 13, Comparative Examples 10 to 16 Table 2 shows the results of a similar test using the bag of Example 3 and changing the shape of the air circulation hole.

Table-2 hand Continued Supplementary Positive book November 4, 1986 1.Display of the incident 1988 Patent Application No. 205306 2. Name of the invention Insect-proof and mold-proof bag for grain 3. Person who makes corrections Relationship with the incident

Claims (1)

[Claims] (1) Inorganic filler 0.5-30% by weight and fungicide 1
1. An insect-proof and mold-proof bag for grains, comprising a film of a thermoplastic resin composition containing 0 ppm to 30% by weight, and having air circulation holes smaller than grains and insect pests.