The basic performance requirements of the tarpaulin are considered from the various uses of the tarpaulin. Generally, the requirements that should be met are: (1) Light weight, easy to fold, easy to handle and operate; (2) High strength, wear resistance, and long service life; ( 3) Good waterproof performance and air permeability, anti-condensation on the inside; (4) Acid and alkali resistance, mildew resistance, anti-corrosion; (5) Good weather resistance, flame retardant and fire resistance; (6) No wicking effect, no wicking effect Moisture will occur. Tarpaulins are generally required to have 'three defenses' functions. Namely waterproof, fireproof (flame retardant), mildew proof. (2) Main performance indicators In the specific product design or use, the following performance indicators of the tarpaulin should be considered. 1. Air permeability: The air permeability of tarpaulins must be considered, especially for military tent fabrics. The factors affecting air permeability include base fabric organization, density, material, type of waterproof finishing agent, and resin adhesion. With the increase of resin adhesion, the air permeability of the tarpaulin decreased. Of course this depends on the finishing agent used. Generally, most of the tents with air permeability are made of cotton, vinylon, lacquer and other short fiber fabrics finished with paraffin or acrylic resin. 2. Tensile strength: The tarpaulin must be subjected to various tensions when in use, such as tension when it is fixed: it must be subjected to additional forces such as wind, rain, and province during use. Despite these external forces, they are still required to maintain their original shape and not easily deformed. In particular, the tensile strength of large tents used as inflatable buildings is extremely important. Generally, the base fabric is made of high-strength polyester, vinylon and other long-fiber fabrics. It is waterproofed with vinyl chloride resin and chlorosulfonated polyethylene resin. The strength of the product is mainly determined by the strength of the fiber material and the density of the fabric. 3. Elongation skin and dimensional stability: As eaves tents and large tents, it is often used under tension. The elongation of the fabric should not be too large, and its dimensional stability is determined by the creep characteristics of the material. 4. Tear strength: The damage of the tarpaulin is mainly caused by tearing, so the tear strength is an important indicator of the tarpaulin.
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