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2023
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The difference between extruded rubber seals and molded rubber seals
Usually, the common forming methods of rubber products are Molding and Extrusion, which can be made into Sealing Rings, O-rings,Oil Seals, Bellows, Diaphragms, Gromment, Rubber strips, Rubber hoses,Tube, Rubber Sleeves, Gaskets, Washer,Lip Seals and and so on. The function of the product is different, the size of the product is different, then the choice of process is also different.
一. Rubber Molding
The molding process, as the name implies, is the processing method of pressing molding. The refined sheet rubber rubber embryo is placed in the cavity of the mold, placed in the cavity of the mold, and then the mold is closed and pressurized to form and cure or vulcanize, and then the mold is released.
The molding process is suitable for thermosetting and thermoplastic products. The rubber products made by the molding process are mainly structural connectors, protective seals and electrical insulation parts, such as sealing rings, gaskets, protective sleeves, sealing plugs, edge sleeves, gaskets, oil seals, miscellaneous products. Widely used in industry and agriculture, transportation, electrical and chemical industry, construction machinery, daily supplies and other materials fields.
Advantages:
1, the product size accuracy is high, the shape is flat, the surface is smooth.
2, can be made into any shape according to demand, one molding.
3, low internal stress, small warping deformation, small shrinkage, mechanical properties are more stable.
Demerit :
1, the length of the product is limited, usually can only be made of less than 600 mm length;
2, the production process will produce flash, removal of flash workload.
3, the mold production is complicated, the development cycle is long, the efficiency is low, the cost is high.
4, the production process and press have certain technical requirements, only suitable for mass production of small products.
二. Rubber extrusion
Extrusion, also known as extrusion molding, generally according to the type and shape of the processed material, select the extruder, head and mouth die, the rubber material through the extruder cylinder and screw action, while being thermoplasticized, while pushing forward to make a variety of cross-section shape rubber products.
In the extrusion process, the rubber material is generally refined, but also through cooling curing or vulcanization and other styling methods, and the process conditions are more complex, such as screw speed, head pressure, material temperature and molding temperature, traction speed.
Extrusion process is suitable for the processing of thermoplastic rubber, the use of extrusion process can be made into sealing strip, pipe, sheet, sheet, film, a variety of complex section shape of rubber products, as well as hollow, solid, foam and other finished rubber products. Widely used in construction industry, petrochemical industry, machinery manufacturing, electronic equipment, automotive aviation and other fields.
Advantages:
1, the length is unlimited, can be produced according to the need of any length of pipe, strip, bar, profile, etc.
2, fast production cycle, high production efficiency, large output.
3, the product has no rough edge, less loss.
4, a multi-purpose machine, through the replacement of different heads and rubber materials, the production and processing of a variety of products.
Demerit :
1, can only be made into tubular, strip, ribbon products.
2, the accuracy is relatively poor, the product shape is complex and difficult to manufacture.
For more information on the dimensions, materials, product catalog and prices of molded rubber seals and extruded rubber seals, please contact us below
Contact: Emily Ke
Email: Emilyke@lanhechina.com
Tel: (86)769-85637586
Phone: (86) 138 2927 2978
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