The three main rubber molded parts manufacturing processes are compression molding, transfer molding, and injection molding
Compression molding is the oldest and least expensive method. With compression molding, a rubber compound is formed into a blank. The blank then gets placed into a mold cavity to be shaped. The heating time is slow, which results in a long curing time; the heating can vary from three minutes for thin walls to 1 hour for thick walls. Some advantages of this method include being suitable for rubber compounds with large surface areas, and the ability to be used for rubber compounds with high viscosity and poor flow properties. On the down side, the process is time consuming with a low production rate. Some of the common products made with the compression molding process include rubber seals, o-rings, electrical insulators, and rubber pads.
Transfer molding is a natural progression in development to limit the disadvantages of compression molding. The process starts out with a blank being loaded in the chamber, which is then distributed into several cavities. In this beginning stage, pre-heating takes place in the rubber, forcing the rubber to flow through channels. This pre-heating reduces the curing time and allows the rubber to flow easier and fill mold cavities efficiently. However, the molds are more complicated and expensive.
Injection molding is the third most common molding process. With injection molding, the press unit and injection unit act as two separate entities with separate controls. The press unit allows for molds to be placed horizontally or vertically. An extruder unit can also serve several presses by moving in a pre-programmed pattern. All of these result in short injection processes with high amounts of pre-heating. With this type of molding, the handling of blanks is eliminated, processes can be automated and cavities and flow channels can easily be filled.Some of the common products made with the injection molding process include rubber wiring grommet,rubber bellows etc
Each manufacturing process is ideal for producing certain types of rubber products. Understanding the processes available can make planning for manufacturing a lot easier because each process has its own cost and time limitations. Xiamen Fuste is a professiong molded rubber parts manufacturer,we can decide which manufacturing process would be most suitable based on customer's parts and their different needs. We can quote for you according to drawing,samples or ideas.For more info ,please don't hesitate to contact me :sales1@fuste.com.cn.
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