The difference between molded rubber products and extruded rubber products
2022-01-05
Molding (compression moulding), rubber raw materials in the closed mold cavity by heating, pressure and molding into products of rubber processing methods. The products using the molding process are: miscellaneous parts, sealing rings, oil seals, etc.
Generally, the flaky rubber block is first made into a blank with a similar shape to the product, placed in the cavity of a heated mold, and then the mold is closed and pressurized to form and cure or vulcanize it, and then the product is demoulded. This method is especially suitable for the molding and processing of thermosetting products.
Advantages:
1. can be made into any shape
2. High precision, beautiful product shape rules
Disadvantages:
1. Generally, the length can only be less than 600mm
2. Long production cycle and low efficiency
3. The production process will produce a lot of raw edges and waste products
4. The mold is expensive and the development cycle is long.
Extrusion (Crowdingout), generally according to the type of polymer being processed and the shape of products or semi-finished products, selected extruder, head and die, as well as the corresponding auxiliary devices such as shaping and traction, and then determine the extrusion process conditions such as screw speed, head pressure, material temperature, and shaping temperature, traction speed, etc. In the extrusion process, the material is generally plasticized, but the shaping method is different. For example, extruded plastics often need to be cooled and shaped to solidify, while extruded rubber semi-finished products need to be further vulcanized. The use of extrusion process products are; rubber sealing strip, hose, rubber cable.
Advantages:
1. can be infinitely long
2. Fast production cycle and high capacity
3. Very little waste is produced
4. The mold is cheap, the development is convenient and fast
Disadvantages:
1. Can only be made into strips
2. Accuracy is poor, part of the shape is difficult to produce
In summary, molding and extrusion processes have their own advantages and disadvantages. Different products have different processes.
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