Pergolas are mainly composed of two parts: the aluminum alloy main frame and the tarpaulin. Tarpaulin products such as pergolas and awnings have functions of rainproof, heat insulation, and cold resistance, so they require certain special performance. Here, HeLi will tell you what essential performance characteristics the tarpaulin must have. When designing or using products, the following performance indicators of the tarpaulin must be considered.
The breathability of the tarpaulin must be considered, especially for military awning fabrics. The influencing factors of breathability include the organization and density of the bottom fabric, the material, the type of waterproof agent, and the amount of resin adhesion. As the amount of resin adhesion increases, the breathability of the tarpaulin decreases. Of course, this is related to the type of finishing agent used. Generally, most breathable tents are made from short-fiber fabrics such as cotton, polyester, and acrylic resin finishing.
The tarpaulin must withstand various tensions during use, such as tension during fixation and additional forces such as wind, rain, and snow during use. Despite these external forces, the tarpaulin must maintain its original shape and not easily deform. This requires the tarpaulin to have high tensile strength and should not have too much difference in the tensile strength of the warp and weft. It is especially important for large inflatable tents used in building construction to have high tensile strength. Generally, the bottom fabric is made of high-strength polyester or polyester fabrics. A waterproof coating of chlorinated vinyl resin or chlorosulfonated polyethylene resin is applied. The strength of the product is mainly determined by the strength of the fiber material and the fabric density.
As roof canopies and large tents are frequently used under tension, the fabric should not elongate too much, and its size stability is determined by the creep characteristics of the material.
The damage to the tarpaulin is mainly caused by tearing, so tear resistance is an important indicator of the tarpaulin. Tear strength is related to whether the awning fabric will rupture due to the impact of foreign objects or form a large structural tear after the formation of holes due to certain factors. Therefore, when the tension is high, the tarpaulin cover should have high tensile strength and tear resistance.
Water resistance is an important characteristic of the tarpaulin. Through impregnation, chlorinated vinyl resin is filled in the gap between the fabric's organization to form a coating. If the amount of resin adhesion per unit area exceeds a certain level, water resistance is not a problem. If the coating is thin, it may rupture when bent, rubbed, or subject to surface wear, which may cause water leakage.
For safety reasons, the tarpaulin must have good flame resistance. Flame resistance can be achieved by selecting flame-resistant fibers and substrates or by adding flame retardants to the coating. The amount of flame retardant added is directly related to the flame retardancy effect.
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