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Silicone Injection molding services produce molded components made from silicone. Silicone rubber is a two-component, synthetic, flexible rubber-like material made from silicone elastomers that can be cured at room temperature into a solid elastomer used in molding. It is heat resistant, durable and free of allergens or leaches able chemicals. Liquid silicone is similar to normal silicone but has different processing characteristics. It is purchased as a two-part raw material with a grease-like viscosity.
Nowadays injection molding of liquid silicon rubber is becoming increasingly important. One reason for this is the increased performance requirements of the finished articles. In addition, more and more producers of rubber parts are seeing benefits in the high level of automation and productivity.
Various ways of silicone molding
Molding processes used by providers of silicon molding services include cast molding, compression molding, dip molding, injection molding, reaction injection molding, rotational molding and transfer molding.
Whereas in the cast molding process, the liquid material is poured into an open mold, in compression molding a slug of silicone is pressed between 2-heated mold halves. On the other hand dip molding is a process similar to hot dip coating, in which the finished product is the fused plastisol stripped from the dipped mold. However, in injection molding liquid silicone is forced into a cooled mold under tremendous pressure. In the Reaction Injection Molding (RIM) process two or more reactive chemicals are mixed at high speed as they are being injected into a mold. In rotational molding hollow molds filled with silicone material are secured to pipe-like spokes that extend from a central hub. In transfer molding, the two mold halves are clamped together and silicone is forced by pressure into the mold.
Why the preferred use of silicone rubber in injection molding
Silastic silicon rubber is a shear material and so its viscosity depends on shear rate. As the shear rate rises the product becomes lower in viscosity. It is this effect that is very favourable for the injection molding process. At the beginning of the injection process the injection speed profile should be programmed in such a way that the volume flow is high enough for the liquid silicon rubber not to begin to vulcanize before the cavity is filled, in order to avoid scorch of the material. Thus liquid silicon rubber is widely used for the process of injection molding due to its following characteristics:
- Solvent less with low and versatile viscosity.
- Easy mixing and pigmentation
- Rapid processing compared to solvent dispersion and usually allows a complete coating to be applied in a single pass
- Prime less adhesion to glass and some other substrates.
- Meter mixed plastic liquid silicon rubber can be dip coated or fed to a crosshead for supported extrusion coating.
To sum up
Silicon rubber molding has come a long way over the past two decades. From its roots in a few specialty applications where premium physical properties counted more than the premium price, this thermoset carved out a small but solid niche in the medical and automotive fields. Now, among a proliferation of new applications, that niche has begun to burst at the seams.
If you are going to running your business with silicone injection molding or rubber molding? Of any or your new project that needs silicone injection molding parts, we suggest you find a silicone injection molding china company to cooperate your business, when you work with a Chinese company, you will have some advantages for your new model and your business.
When you work with silicone injection molding china suppliers, you will have a very competitive price, so you could save your budget on your new model, especially if you are the first time running your one business, this will be one the most important thing to decide if your business will be going smoothly or not.
The advantages number two,
If you choose an injection mold china supplier for your plastic molding parts, silicone rubber molding parts, you will be moving faster than your local supplier, all of the Chinese mold companies are hard working, fast delivery time, this will save your time and work your project faster on the market, when you put some money into the project, faster will be faster to gain some profits from your project.
Of course there are some disadvantages when you work with a Chinese molding company, for example, the language.
But here you do not need to worry any more, in our factory we have professional technical manager who speak fluent English that will solve all of your issues, you could contact us by email or phone.