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Silicone Molding Production

About Silicone Compression Molding

silicone parts compression molding workshop

For silicone molding production, our facility is equipped with more than 10 sets of professional vulcanization equipment to produce various molded silicone products.

Silicone compression molding is a common manufacturing technique used to transform uncured / unvulcanized silicone rubber into a pre-defined shape, the uncured silicone rubber material will be placed between two halves of a pre-heated tool mold.

The mold is then closed under a top force from the vulcanizer molding machine. The high pressure will force the silicone material into contact with all areas of the mold cavity.

The heat and pressure will last for a few minutes until the raw material is fully cured, so this process is also known as silicone vulcanization.

Silicone Compression Molding Production Process

1. Choose the right silicone material and durometer

The silicone molding production process begins with silicone raw material selection. Silicone rubber materials are formulated to meet different application needs, so they are divided into Different Options. Choosing the right silicone material when manufacturing a new silicone product is vital for its success.

By understanding our client’s needs properly, we will recommend the best silicone material. Based on product structure/function, application environment, performance, safety test requirement,s and customer’s budget, the most feasible material will be selected.

engineering-support-material-select

2. Silicone material compounding and mixing

Silicone raw material itself is milk-white or transparent gum-like component with no any elasticity and strength. In order to improve the characteristics of raw silicone material and to have the desired colour, silicone material will be compounded with many ingredients such as vulcanizing agent, reinforcing filler, accelerator, colorant, etc.

Silicone compounding is the complex technology of selecting and blending silicone with other ingredients. The proper mixture is crucial to the success of silicone molding production.

silicone mixing process

3. Cutting / Blanking

Silicone material after blending will be collected in large rolls covered with film to prevent dust or dirt. It then will be cut into slices by an automatic cut machine. The slices’ length and width will be controlled according to the silicone part’s weight to be molded. Silicone blanking makes it easier for our molding operators to weight the material during silicone molding production.

silicone cutting

4. Weight and place the silicone material onto preheated tool mold

Molding operators should be able to cut slices into small pieces and weight accurately, then place them quickly onto the tool mold in right place. Material weight is crucial, as too much material will lead to silicone parts size increase, and lack of material will cause small size or missing part.

5. Silicone part vulcanization molding

Silicone material will be fully cured under high temperature and pressure from vulcanizing molding machine, then the silicone parts are formed. Our molding department is equiped with 12 high precision automatic vacuum vulcanizing machines which can be used to craft more high performance silicone parts. Our sophisticated molding machines, coupled with our skilled operators, provide the capacity and flexibility to mould high-quality, high-volume silicone parts in short peroid.

silicone molding production

6. Demolding

When the silicone is fully cured, the vulcanizing molding machine will release the pressure automatically, tool mold will come out and open for molding operators to remove the molded silicone parts. The raw material will be placed again for the next round of vulcanization.

silicone molding production

7. Bur Removing

Due to the low viscosity of silicone material and high molding pressure during heating and curing, The pressurized silicone material will flow to every spaces of tool mold. Flash can be minimized with favorable designs and better tooling and accurate material weight during vulcanizer molding production. Flash will be removed mainly by hands, more precisely controlled, cryogenics deflashing can also be applicated for some cases.

Bur Removing
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