At present, the method of making the type O sealing ring are mainly used compression molding production is given priority to, the curing method of moulded products mainly have three plate mold, transfer molding and injection moulded.
The oldest tablet moulding method.
Transfer molding around before and after the 1950 s began to use, and to shoot with moulded, since the 60 s gradually by the plastic industry in rubber industry.
The current trend is gradually developed injection molding method, but due to adapt to the scope of the different.
The coexist and obtain development is still a reality.
Type O sealing ring according to its characteristics is still primarily in the flat die forming method.
In mold vulcanization process, must strictly accurate vulcanizing temperature, time and pressure, and keep an eye on the vulcanization process parameters such as temperature changes, the corresponding processing, otherwise there will be a great product owe sulfur or sulfur.
If adopt the automatic control system, the whole process of vulcanization will automatically record and control, to ensure that products meet is the degree of cure.
Vulcanized rubber type O sealing ring vulcanization reaction temperature is one of the basic conditions, it directly affects the curing rate and the quality of the product.
High curing temperature, curing speed, high production efficiency.
Low curing temperature, curing speed is slow.
Curing temperature is according to the formula, the most important of these is used depends on the analysing and vulcanizing system.
Natural rubber is the most suitable vulcanization temperature is 143 ℃ - commonly
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150 ℃, synthetic rubber is 150 ℃ ~ 180 ℃ in general.
Vulcanization time usually set in accordance with the curing temperature, curing time determined by test.
Pressure in the process of vulcanization rubber seals
products, its aim is to make the flow, to the full of cavity, prevent the vulcanization process of bubble, the density of product.
Vulcanization pressure large rubber hardness, and the size of the mould.
hardness, mould size, pressure can be bigger, the opposite should be appropriately reduced pressure.
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