The raw materials of plastic woven bags are composed of PP (polypropylene) and PE (polyethylene). During the May Day period, the PP market was relatively flat. The transaction atmosphere is less than ideal. The editor believes that the slump in the PP market may be related to the off-season of the woven bag market from May to September every year. The demand is low, and the transaction volume is naturally low. Of course, with the continuous reduction of crude oil prices, coupled with the unstable mentality of some markets, the prices of some PP markets have declined slightly, but the overall market has not changed much and the impact is minimal. In the next few months, the editor believes that the PP market transaction has limited room for growth. If there are no special circumstances, the market will maintain a stable state for a long time. Plastic woven bags have the characteristics of light weight, good electrical insulation, good corrosion resistance, and easy processing and molding. Plastic woven bags have some general characteristics of PP and its own characteristics. as follows:
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1. Lightweight
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PP is usually lighter, and the density of PP woven bags is about 0.9-0.98 grams/cubic centimeter. Commonly used plastic braids, if no fillers are added, are equal to the density of plastic. The density of plastic weaving application plastic is 0.9-0.91 grams/cubic centimeter. Usually braids are lighter than water.
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2. High breaking strength
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Plastic braid is a kind of flexible material with high breaking strength in plastic products, which is related to its molecular structure, degree of crystallinity, draft orientation, etc., and also related to the type of additives. If the specific strength (strength/specific gravity) is used To measure the plastic braid, it is higher than or close to the metal material.
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3. Good chemical resistance
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Plastic braid has good corrosion resistance to inorganic and organic substances, and it has no effect on it for a long time below 110 degrees Celsius. It has strong chemical stability to solvents, greases, etc. When the temperature is raised, carbon tetrachloride, xylene, turpentine, etc. can swell to it. It is oxidized by fuming nitric acid, fuming sulfuric acid, halogen elements and other strong oxides. It has good corrosion resistance to strong alkalis and common acids.
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4. Good wear resistance
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The friction coefficient between pure plastic braids is small, only about 0.12, which is similar to nylon. To a certain extent, the friction between plastic braids and other items has a lubricating effect.
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5. Good electrical insulation
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Pure plastic braid is an excellent electrical insulator. Since it does not absorb moisture, it is not affected by moisture in the air, and its breakdown voltage is also high. Its dielectric constant is 2.2-2.6. It is equivalent to using it as an insulating material.
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6. Environmental resistance
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At room temperature, the plastic woven fabric is actually completely free from water erosion. The water absorption rate within 24 hours is lower than 0.01%, and the water vapor permeability is also very low. At low temperature, it becomes brittle and easy to crack. Plastic braids do not get moldy.
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7. Poor anti-aging ability
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The anti-aging ability of plastic woven bags is poor, especially PP woven bags are lower than polyethylene woven bags. Its aging problems are mainly thermal itching aging, photodegradation. The poor anti-aging ability of plastic woven fabrics is one of its main deficiencies, which affects the service life and application fields of woven bags.