China Plastic Handle Manufacturers Solve Problems For You

Plastic injection molding is one of the most versatile processes and is suitable for a wide range of Pet Preform applications, usually at a competitive price. However, as with almost any manufacturing process, there are other solutions worth exploring to meet more specific needs. In the case of plastic injection molding, your needs may determine that the reaction injection molding process can provide more favorable manufacturing performance and price than standard plastic injection molding processes.
If you are not familiar with the reaction injection molding process, we will study it carefully, including its similarities and differences with standard plastic injection molding. We will also study the steps of reaction injection molding and plastic injection molding, and their role in your decision making.
Plastic injection molding and reaction injection molding
plastic ball
As you may know, in plastic injection molding, the plastic resin (usually in the form of particles) is heated to the melting point (this may vary from material to material). Once melted and homogenized into an injectable liquid form, the resin is fed through an injection molding machine and pressure injected into one or more mold cavities through mold gates and runners. As pressure continues to be applied, the liquefied material fills the mold cavity and begins to cool. Once the mold is completely filled, the cooling process is typically accelerated by applying an external cooling element to the mold. This is done in order to re-present the resin in its original solid form and then, once hardened to an acceptable level, is discharged from the mold.
In reaction injection molding, the process is very similar, but there are several key differences. Different types of substrate materials are used, called thermoset materials. Thermoset materials work in a manner that is essentially the opposite of standard (or thermoplastic) resins because they are hardened by heating (or curing) rather than cooling. Reaction injection molding is also different because essentially two base polymers are combined (as opposed to plastic injection molding, plastic injection molding can be combined with materials, but not required). These two materials must be combined because they cause a reaction that fills the cavity with the material by expansion. This is the origin of the name “reaction injection molding”. Once the cavity is completely filled, it is heated. This causes the material to (irreversibly) harden and solidify.
In reaction injection molding, the important point to remember is that constant pressure is not necessarily required to “package” the mold. Because the material reacts and expands on its own (although pressure is still required to bring the material into the mold); heating rather than cooling can cause the material to harden and solidify.
Jilian Plastic Mould is a professional manufacturer of plastic molds and equipment. After years of development, it has become a China Plastic Handle Manufacturers that will be chosen by customers all over the world. If you have other problems, please feel free to contact us!

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