The basic process
With modern industry especially the rapid development of chemical industry, rubber products, but its production process is basically the same. In general solid rubber (rubber) products as raw materials, production process, it mainly includes:
Raw material preparation, mixing, mixing, forming and vulcanization, rest and inspection
2. raw material preparation
The main material rubber products are rubber, complexing agent, fiber materials and metal materials. Which is the basic raw materials; compounding agent is some auxiliary materials in order to improve the performance of rubber added; fiber materials (cotton, linen, wool and synthetic fiber and synthetic fiber) and metal materials (steel wire, copper wire) as skeleton material for rubber products, to enhance the mechanical strength, limit the product variant.
In raw material preparation process, accurate weighing ingredients must be in accordance with the formula. In order to make the rubber and the complexing agent can mutually mixing, the need for processing of some materials: content from rubber plantations
To rubber at 60--70 deg.c drying room drying soft, then cut into small pieces of broken plastic glue,;
Block complexing agent such as paraffin, stearic acid and rosin to crush;
Powder compound agent containing mechanical impurities need to be removed if the screening of coarse or;
Liquid complexing agent (pine tar, ancient Malone) need heating, melting, evaporation and filter impurities;
Complexing agent to dry, otherwise easy to agglomerate, mixing old can not be evenly dispersed bubbles during the vulcanization, thus affecting the quality of products;
Rubber elastic, lack the necessary performance when processing (plasticity), so it is not easy to process. In order to improve the plasticity, so the rubber mastication; thus, the mixing of ingredients easily dispersed in rubber; at the same time, in the rolling forming process is also helpful to improve the permeability of the rubber material (into fabric inside) and forming mobility. The long chain molecules were degraded, the formation process of plasticity is called plastication. Mechanical plastication and mixing two kinds of thermoplastic plastic mixing method of rubber. Mechanical plasticization is the effect of mechanical extrusion and friction on the structure of a long chain rubber at a rather high temperature, which causes the degradation of long chain rubber molecules to become shorter and from a high elastic state to a plastic state. Hot hot mastication is to pass into the rubber in the compressed air in the heat and oxygen under the effect of the long chain molecular degradation becomes shorter, resulting in plasticity.
From the content of rubber plantation
In order to adapt to the different conditions of use, to achieve a variety of performance, but also to improve the performance of rubber products and reduce the cost, must be added with different chemicals in the raw. Mixing is the mixing of raw rubber and compound mixing,
In rubber machine, through mechanical mixing, the agent completely and uniformly dispersed in the rubber in a process. Mixing is an important process in the production of rubber products. If the mixture is not uniform, it can not give full play to the role of rubber and mixture, and affect the performance of the product. Rubber obtained after mixing, known as mixing, it is made of various rubber products, semi-finished materials, commonly known as glue, are usually sold as a commodity, buyers can directly feed rubber products processing, which requires the use of rubber vulcanization. According to the formula, mixing with different brands and varieties of a series of different properties, selection.
In the production process of rubber products, the use of rolling machine or extruder made of pre process, every kind of shapes of different sizes, called molding. The molding methods are:
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Calenderingmolding is suitable for the manufacture of sheet and plate products simple. It is a method to press the compound rubber through the calender to form a certain shape and a certain size of film, called calendering. Some rubber products (such as tires, adhesive tape, hose, etc.) used in textile fiber material, must be coated with a thin layer of glue (glue on the fiber is also called glue or wipe glue), gluing process is generally completed on the calender. Fiber materials need to be dried and dipped in rolling before drying, the purpose is to reduce the moisture content of the fiber material (to avoid evaporation and improve foaming) fiber material temperature, to ensure the quality of rolling process. Dipping is a necessary step before hanging glue, in order to improve the bonding performance of fiber material and rubber.
Extrusion molding for rubber products is more complex, like a tire tread, rubber hose, metal surface coating by extrusion molding manufacturing method. It is a method of continuous molding with a certain plastic mixture into the hopper of the extruder, under the screw extrusion, through a variety of mouth shape (also known as model).. Before extrusion, the rubber must be preheated so as to make the rubber soft and easy to extrude, so as to obtain a smooth and accurate rubber product. This article from the rubber information network
Molding can also be used to manufacture some complex shape molding methods (such as leather, rubber products, sealing ring) with the Yin and Yang of the mould, glue placed heating molding in the mold.