The characteristics of various tent tarpaulins

At present, there are many kinds of tourist tents on the market, which can be mainly divided into two categories: one is“Alpine type”, Mainly designed to cope with relatively harsh climatic conditions, the performance indicators focus on wind resistance, rain resistance and high strength. It is more sophisticated in the selection of materials and more complicated in the production process. It belongs to the middle and professional tents and is suitable for the more complex climate environment during mountaineering and exploration. another class“tourist type”It is designed for general outings and camping. It pays more attention to economy in material selection, and the production process is relatively simple. It is a low-grade tent and can be used for camping in general environments. At present, there are 5 kinds of tarpaulin materials for the manufacture of tourist tents: (1) Canvas: strong waterproof, good heat insulation effect, not hot when the sun is shining. (2) Nylon (NYLON): bright and smooth, not easy to fade, soft texture, good strength, not easy to mold, moth-eaten, low hygroscopicity, poor air permeability, not hardening in case of freezing, easy to wrinkle and difficult to recover. (3) TC fabric: a fabric blended with polyester (terylene) and cotton (cotton), that is, polyester is woven in the warp part, and cotton yarn is woven in the weft part to synthesize TC fabric, which has both the characteristics of polyester and cotton yarn, and is resistant to Grinding, durable, good strength, good air permeability, strong texture, but too heavy, mostly used for medium and large tents. (4) Sephora: nylon and man-made fiber (rayon) blended fabric, after synthesis, it has the characteristics of nylon and rayon, the cloth surface is smooth, the air permeability is good, but the durability and strength are poor, and it is mostly used in continental cold climates. (5) CORETEX: It is a product of the new high-tech products of the United States, which is breathable, waterproof, light weight, wear-resistant and durable, but the price is quite expensive. Disaster Relief Tent On May 12, 2008, after the devastating earthquake in Wenchuan, Sichuan, tents were an indispensable part of the relief supplies sent to the disaster-stricken areas from all over the world. Tent became a shelter for the victims after the earthquake. Disaster relief tents are mainly of two types: single tents and cotton tents. The Red Cross Society of China disaster relief tents mostly use 600D×600D(2×2) Polyester PVC or PU coated waterproof chemical fiber tarpaulin. The single tent for civil disaster relief is mainly made of 333dtex/333dtex polyester yarn (300D) sky blue coated with PU waterproof chemical fiber tarpaulin. The cotton tent is mainly made of 333dtex/333dtex polyester yarn (300D) coated with PVC waterproof and low temperature resistant tarpaulin. PVC is polyvinyl chloride polymer organic matter. PVC coated fabric has the following characteristics: first, it has special properties such as rainproof, flame retardant, static resistance, and easy molding; second, it has the characteristics of low input and high output. But chlorine is one of the main elements contained in PVC, and the chlorine content of PVC is about 57%. In order to enhance the heat resistance, toughness and ductility of PVC coated fabrics, manufacturers need to add various additives in the production process, such as plasticizers and stabilizers. The plasticizer phthalic acid (ph-thalate) is widely used in PVC. CMR substances (CMR substances mean cancer-causing, gene-mutagenic, reproductive-toxic substances). And the PVC coated fabric is not breathable, it is easy to harden, become brittle, crease or break when used in winter, and it is not suitable for the alpine climate in pastoral areas. PU is a polyurethane polymer organic matter. It is a stable and low temperature resistant coating. After coating, the fabric feels plump, elastic and has a film feel on the surface. Both PVC and PU coated fabrics are functional coated fabrics, but PU coating is more complicated in manufacturing process than PVC coating, and its physical properties are better than PVC. Corresponding breathability. Due to the poor technical equipment and production environment conditions of a considerable number of factories in China, the PU coating technology produced is unstable. The actual rainproof performance of the fabric often called PU1000 coating is equivalent to PU500, and it is very uneven, and the rainproof performance cannot be guaranteed. Disaster relief tents are mainly used for temporary and short-term disaster relief. Considering the convenience and lightness of use and transportation, the fabrics used are mostly airtight or poorly breathable PVC or PU coated fabrics, which have poor thermal insulation and thermal insulation effects. The temperature in the plateau pastoral areas is low at night, and the hot air produced by the herdsmen during the daytime production and life will condense on the inner wall of the tent under the action of the cold air outside the tent.“cold room effect”; And when the sun is strong during the day and the temperature rises, the tent will“sweat”,Appear“Warm room effect”.

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