Radial tire structure design and process requirements
Width of Extruded Film with Wide Width According to the theory of rubber calendering process, the compressibility of the rubber volume is very small. In fact, it can be considered that the rubber material is incompressible, that is, the volume of the rubber material will not change before and after rolling. . Therefore, while the thickness of the sizing material is being compressed, it must be accompanied by a corresponding extension of the width and length. The pressure-sensitive adhesive material flows in the direction of the force, so that the rubber material produces a large amount of extension in the direction of rotation of the cylinder (ie, the direction perpendicular to the axis of the cylinder) with a small variation in width and a widening factor β≈1, that is, The compression feed width b is close to the desired product width b. Thus, in the range of the contact angle of the calender, the greater the thickness of the deposit, the greater the extension in the direction of rotation of the drum. From the rolling process theory above, the width of the film fed into the nip of the two-roll calender (i.e., the width of the film extruded from the wide head) should be close to the desired product width. In the wide head, the rubber material is distributed over the entire width through the fishtail runner. Inserts can be placed in the fishtail runners. When it is necessary to change the width of the wide-width head extrusion film, the insert can be replaced. To adjust. The main technical parameters for producing the inner liner by the roll head extrusion method are as follows: extruder screw diameter D150mm; screw length; most; calender roll specification Υ400×1100mm; roller shape on roll belt type, lower roll plane (not Belt type); roller maximum temperature 120 °C; maximum width of the rolling speed sheet 850mm; film composite centering error ± 3.4 The main advantages and disadvantages Roller head extrusion method The advantages of producing inner liner mainly in the following aspects: 1) The product produced is free from bubbles; (2) The product has a wide range of thickness and can produce thicker film; (3) The wide extruder head guarantees the best feeding of the calender; (4) The product has high precision and the whole Thickness error in width is small; (5) Belt type film can be produced according to tire structural design requirements. Its disadvantages are the high cost of "type sets" and equipment investment. At present, most of the Chinese tire manufacturers use radial roller head extrusion or four-roll calendaring when producing radial tire inner liners. The product quality produced by the extrusion method is better than the calendering method, but the equipment investment is also much higher than the calendering method, and currently it mainly depends on imports. Therefore, the domestic tire machinery factory should adopt the digestion and absorption of these two production methods, and develop a more economical and practical production equipment suitable for China's national conditions under the premise of structural design and technological requirements for radial tires. Tools & hardware refers to all kinds of metal devices made of iron, steel, aluminum and other metals through forging, calendering, cutting and other physical processing.
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