An expert in PVC tarpaulin / PVC film industry since 2002

What properties do flame retardant fireproof tarpaulins need to have when they are manufactured?

by:LINYANG     2023-03-26
There are many kinds of flame retardant and fireproof tarpaulins with different functions, such as fireproof tarpaulins, rainproof tarpaulins, car tarpaulins, etc. When choosing a tarpaulin, the first thing to look at is the raw material of the tarpaulin, to see if there are substances that are harmful to the human body, and to smell if there is a choking smell. If you want to buy a large number of tarpaulins, it is good that you can go to the manufacturer to have a look, go to the field, compare the quality, and take a look at the price. Shading and waterproofing are the main functions of tarpaulins. When purchasing tarpaulins, you can test them on the spot, check the waterproof function with water, and you can stretch the tarpaulins to test the effect of blocking sunlight. 1. What properties do flame retardant and fire retardant tarpaulins need to have when they are manufactured? 1. Air permeability: The air permeability of tarpaulins needs to 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, tents with air permeability are mostly made of cotton, vinylon, lacquer and other short fiber fabrics finished with paraffin or acrylic resin. 2. Tear strength: The damage of the tent is mainly caused by tearing, so the tearing strength It is an important indicator of tarpaulin. The tear strength is related to whether the tarpaulin will break due to the action of flying foreign objects or expand to the surrounding after forming holes for some reasons, forming large structural cracks. So, when the tension is high. Both high tensile strength and high tear strength are required for the tarpaulin. 3. Elongation skin and dimensional stability: As a canopy tent and a large tent, 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. Water resistance: Water resistance of fire-retardant and fire-resistant tarpaulins is an important feature of tarpaulins. Through impregnation and finishing, vinyl chloride tree fat is filled in the gaps of the fabric to form a coating film. If the resin adhesion amount per unit area exceeds a certain level, water resistance will not be a problem. If the coating film is thin, when it is bent, rubbed or worn on the surface, the coating film is easily broken, which may cause muddy water. 5. Flame retardancy: From the stability of use, the tarpaulin is required to have good flame retardancy. Flame retardancy can be obtained by selecting flame retardant fibers and flame retardant base fabrics. It can also be achieved by adding flame retardant to the coating agent. The amount of flame retardant added is directly related to the flame retardant effect. 6. Tensile strength: The tarpaulin must bear various tensions during 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. Waterproof finishing 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. 2. How to detect the density of flame retardant and fireproof tarpaulin? (1) Direct measurement method of tarpaulin: The direct measurement method is completed by means of a cloth mirror or a fabric density analysis mirror. The length of the scale of the fabric density analysis mirror is 5cm. Under the analysis lens, a long glass piece is engraved with a red line. When analyzing the fabric density, move the lens and align the red line on the glass piece and the red line on the scale at the same time. Between the yarns, take this as the starting point, and count the yarns while moving the lens until the 5cm scale line is this. The number of output yarns is multiplied by 2, which is the density value of 10cm fabric. When counting the number of yarns, take the center between the two yarns as the starting point. If the count reaches the end point, it exceeds 0.5, and when it is less than one, it should be counted as 0.75. If it is less than 0.5, then 0.25 root count. Generally, 3-4 data should be measured for fabric density, and then the arithmetic mean value should be taken as the measurement result. (2) Indirect test method for tarpaulin: This method is suitable for fabrics with high density and small yarn characteristics. At first, after analyzing the fabric structure and the number of weave cyclic warp yarns (the number of weave cyclic weft yarns), and then multiplying the number of weave cycles in 10cm, the product obtained is the warp (weft) yarn density. The calculation unit of the density of flame retardant and fireproof tarpaulin fabric is in metric system, which refers to the number of warp and weft yarns arranged within 10cm. The size of the density directly affects the physical and mechanical indicators of the fabric's appearance, feel, thickness, strength, folding resistance, air permeability, abrasion resistance and thermal insulation performance, and it is also related to the cost of the product and the size of the production rate.
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