Rubber molding process
The rubber mixture is placed in the model, using the vulcanizer pressing process under specified conditions of time, pressure and temperature. The main process includes mixing - mixing - extrusion - feeding - molding - vulcanization - mold opening - burr removal - inspection - packaging - storage. The products using the molding process are: miscellaneous parts, sealing rings, oil seals and so on. Generally, the powder flake rubber block is first made into a blank similar to the shape of the product, placed in the cavity of the heated mold, and then the mold is closed and pressurized, so that it is formed and cured or vulcanized, and then the product is obtained by demudding. This method is especially suitable for the molding processing of thermosetting products.
Process characteristics
1. It can be made into any shape.
2. High precision, beautiful product shape rules.
3. The production process will produce a lot of raw edges and waste products.
4. The mold cost is expensive and the development cycle is long.
Rubber extrusion process
The rubber material in the extruder screw extrusion, through a certain shape of the mouth (hollow products are mouth core type) for continuous modeling process. Generally, according to the type of polymer processed and the shape of the product or semi-finished product, the extruder, head and mouth die are selected, as well as the corresponding auxiliary devices such as styling and traction, and then the extrusion process conditions such as screw speed, head pressure, material temperature, and styling temperature, traction speed are determined. The process is mainly used for the production of rubber products with complex section shapes or hollow, such as rubber hose, tape, tire tread rubber and so on. The main process includes hot refining of rubber (cold feed extrusion does not need to go through hot refining), rubber supply, extrusion, cooling, cutting, picking and parking. In actual production, extrusion process can be divided into hot feed extrusion method and cold feed extrusion method according to the feed form. In the extrusion process, the material is generally plasticized, but the styling method is different. For example, the extruded plastic often needs to be cooled to make it solidified, while the semi-finished product of extruded rubber needs to be further vulcanized. Products using the extrusion process are: rubber seal, rubber hose, rubber sheath cable.
Process features:
1. Fast production cycle and high capacity.
2. Very little waste is produced.
3. Mold development is convenient and fast.
4. Accuracy is less, some shapes are difficult to produce.
Rubber injection technology
The rubber material is injected directly from the cylinder into the model vulcanization molding method, which mainly includes feeding, plasticizing, injection, pressure holding, vulcanization, molding and other processes. The process requires the same temperature of the inner and outer layers, and can be quickly vulcanized during vulcanization. In the actual production, adjusting the viscosity of the compound Mooney, rationally designing the vulcanization process and selecting the appropriate vulcanizing agent and accelerator are helpful to improve the production efficiency and yield of injection molding recycled latex products. The rubber products produced by this process have good quality and are widely used in automotive, medical, machinery and other fields.
Process flow
1. Preparatory work: including rubber raw material screening, drying, preheating and other operations, as well as mold design, manufacturing and debugging.
2. Material production: The dry rubber particles are added to the rubber extruder, and the material is pre-treated through a series of processes such as heating and extrusion.
3. Molding: The pre-treated rubber material is sent into the mold by the injection machine for the molding process. At this time, a certain pressure and temperature need to be connected to make the rubber raw material form the product of the desired shape and size.
4. Compression release: After the molding is completed, it is necessary to cool down and release the rubber products from the mold.
Process characteristics
1. Single production capacity: the single production capacity of rubber injection molding machine is generally between tens of grams and several kilograms, which greatly improves the output of finished products.
2. High product accuracy: The rubber injection molding machine can precisely control the temperature, pressure and other parameters of the material during the molding process, thus greatly improving the accuracy of the product.
3. Short molding cycle: Because rubber injection molding can form multiple products at the same time, and the production capacity is large, the molding cycle is relatively short.
4. High quality of finished products: rubber injection molding can reduce products because of uneven forming, bubbles and other problems, so that the quality of products is greatly improved.
Rubber molding process, extrusion process and injection process in the production of rubber products have an important position, each process has its own unique characteristics and scope of application, enterprises can choose the right process according to the needs and requirements of the product to improve production efficiency and product quality. With the continuous progress of science and technology, these processes will continue to develop and improve, providing more powerful support for the development of the rubber products industry.
Disclaimer: This article is a network reprint, copyright belongs to the original author. However, because there are many reprints, or can not confirm the real original author, so only indicate the reprint source, such as mismarking the source, involving the copyright of the work, please contact us, we will delete the content in the first time! Information source network, slightly collated, only for the reference of rubber industry technicians, there is no commercial purpose.
Follow-up want to know more about rubber related information, please pay attention to Hengxin rubber and plastic manufacturers.