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Bias tyre is intercrossed by multilayer treads. Due to different materials, it can be divided into cotton tyre, rayon tyre, nylon tyre, polyester tyre and steel wire. Here are their features: 1. Cotton tyre. Cotton tread is made by cotton textile. Cotton is the earliest material used in tyre making. Due to its low intensity, multiple layers, high heating, slow heat transfer, few re-treading time and much water absorption, it has no longer been used. Even so, other materials still take cotton as standard, which has become a practice in tyre industry till now. 2. Rayon tyre. After cotton, rayon has been widely used, which firstly appeared on Paris Exhibition in 1889. Invented by a famous French physiologist, it has the same luster and feeling like silk but is more highly tensile than cotton. By its features like heat and fatigue resistance, it became main material of tyre making. Compared with the cotton tyre, rayon tyre is better in comprehensive performance, which made tyre industry stride forward again. Its disadvantage is hygroscopic so as that its strength will be reduced in wet condition. 3. Nylon tyre. Nylon was invented by an American chemist and published by his Dupont Corp. in 1938. Since publication, it has caused widely attention in the world. Some guys called it “Tougher than steel, thinner than spider silk, made by coal, air and water, but elastic and shining like protein fibre”. As tyre tread, nylon is more tensile, impact resistant, elastic, lower density, renewed and difficultly hydrophilic, but its disadvantages are thermal expanded and easily deformed. In winter, if vehicles parked outside for a long time, there will appear “flat spot”, which is caused by this, too.

Good tyre maintenance work, timely discover and deal with the problem, for maintaining the normal technical condition of the tyre, extending the service life is very important. Routine maintenance of tyre owners should do the following "five ground":

First, the ground check air pressure. To meet the standard tyre pressure, check air pressure to prevent tyre damage caused by abnormal pressure. Pressure is too low, will tyre deformation, a sharp increase in tyre temperature, carcass soft, resulting in unusual tread wear, tyre cord in the loose, broken, cracked or carcass grind a bad shoulder. The tyre pressure is too high carcass cord force increases, the flex resistance decreased, resulting in grinding crown, crown explosion, abnormal tread wear. At the same time, and equipment tyres due to uneven pressure overload caused by damage to a single tyre.

Second, the ground check tyre temperature. To maintain normal fetal temperature, especially in the summer to pay special attention to traffic, to avoid tyre tyre temperature rise caused by increased internal pressure, fatigue, exacerbated cause a tyre blowout.

Third, the ground dug stones. Vehicle to frequently check and remove attached to the tyre tread between the pebbles and debris, so as not to squeeze the tyre tread groove running in the gravel bottom of the base plastic stab in the flex under the action of the rubber extension of cracks along the wound.

Fourth, the ground check wear. Ensure that the tyre tread depth remaining depth of the proposed, if it is found tyre tread wear ditch logo appears, it should be replaced immediately to prevent the risk of tyre. Should also be spare no tyre sidewall inspection, if there are abnormal fetal side of the convex or serious scratch, you must stop using so as to avoid damage caused by serious accidents continue to expand.

Fifth, the ground plug hole. During the inspection, appear on the tread compound found in the small Zhakou, able to do so as far as possible be filled with raw rubber to prevent sediment intrusion cord layer, resulting in an empty bar phenomenon.

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