Process for producing rubber products
In the production process of rubber products, the process of making various shapes and sizes is made by using a calender or an extruder, which is called forming. Forming methods are1. rolling formingThe utility model is suitable for making simple sheet and plate shaped articles. It is a method of pressing compound rubber into a certain shape and a certain size of film by calender. It is called calendering forming. Some rubber products, such as tires, adhesive tape, hose and other textile fiber materials, must be coated with a thin layer of glue on the fiber, also known as glue or glue, the process of gluing is generally completed on the calender. Fiber material needs drying and dipping drying before calendering. The purpose is to reduce moisture content of fiber material, avoid evaporation and foaming, and increase the temperature of fiber material, so as to ensure the quality of calendering process. Dipping is a necessary process before cementing. The purpose is to improve the bonding property of fiber and rubber.2. extrusion moldingFor more complex rubber products, such as tyres, tread, hose, and wire surface coating, shall be made by extrusion molding. It is a method of continuous molding with a certain plastic compound into the extruder's hopper, the extrusion of the screw under the internal screw, and through a variety of dies, also known as the templates. Before extrusion, the material must be preheated to make the material soft and easy to extrude so as to obtain a smooth and accurate rubber product.3. moldingIt can also be used to make some rubber products with complex shapes, such as leather bowl and sealing ring. The rubber material is placed in the mold and shaped by heating.
In order to adapt to the different conditions of use, to achieve a variety of performance, also in order to improve the performance of rubber products and reduce the cost must be added with different chemicals in raw. Mixing is the mixing of raw rubber and compound mixing, placed in the mixing machine by mechanical mixing with the role of agent, uniformly dispersed in rubber in a process. Mixing is an important process in the production of rubber products. If the mixture is uneven, it can not give full play to the role of rubber and mixture, and affect the performance of products. People get glue mixing after the production of various rubber products for mixing it is semi-finished materials, rubber products, commonly known as the glue are usually sold as a commodity buyers can directly process material, need to use the rubber vulcanization. According to the formula, a series of different grades and varieties with different performances are selected.
Rubber elastic, lack of necessary processing plasticity properties, therefore not easy to process. In order to improve the plasticity, so the rubber mastication, so the mixing of ingredients easily dispersed in rubber, which also helps to improve the permeability of the fabric into rubber and molding in rolling and molding process. The long chain molecular degradation were called plasticity forming process of mastication. Mechanical plastication and mixing two kinds of thermoplastic plastic mixing method of rubber. Mechanical plasticization is the reduction of long chain rubber molecules at shorter temperatures through the mechanical extrusion and friction of the extruder, which changes from a high elastic state to a ductile state. Hot hot mastication is to pass into the rubber in the compressed air in the heat and oxygen under the effect of the degradation of long chain molecules to obtain shorter plasticity.
The 1. main raw materials of rubber products with rubber as basic material, and rubber is grown in tropical, subtropical and the rubber tree bark collected by artificial cut.2. various compounding agents are auxiliary materials used to improve some properties of rubber products.3. fiber material (cotton, linen, wool and all kinds of man-made fiber, synthetic fiber and metal materials, steel wire) is used as rubber products skeleton material, in order to enhance the mechanical strength, limit product variant. In the preparation of raw materials, the ingredients must be accurately weighed according to the formula. In order to make the rubber and the complexing agent can mutually mixing, need to process material. Rubber to 60--70 C drying room drying soft gel, gel breaking and then cut into small pieces, with a massive agent. Such as wax, stearic acid, rosin and so on to be crushed. If the powder containing mechanical impurities or coarse screening to remove liquid such as pine tar, ancient Malone needs heating, melting, evaporation and filter impurities, complexing agent to dry or easy to agglomerate, when mixing if not dispersed vulcanized bubbles will affect the quality of the products
There are many kinds of rubber products, but the production process is basically the same. The basic process of rubber products in general solid rubber - rubber as raw materials including: plastication, mixing, calendering, extrusion, molding, curing 6 basic processes. Of course, raw materials preparation, finishing, inspection, packaging and other basic processes are indispensable. The processing of rubber mainly deals with the contradictory process of plasticity and elasticity. Through a variety of techniques, the elastic rubber plastic rubber has become the addition of various additives made of semi-finished products, and then through the vulcanization has semi-finished plastic and rubber products into high elasticity and good mechanical performance.
