The thermoplastic injection moulding process
Thermoplastic molding involves injecting a molten polymer (thermoplastic material) into a mould under high pressure.
In other words, this moulding technique heats and melts the plastic material which is then inserted into a closed mould. After solidification of the material, the mould can be opened and the new product component can be extracted.
In injection moulding, which is carried out by an injection moulding machine, the temperature and pressure of the plastic material are very high in order to guarantee a better smoothness inside the mould.
This process brings several advantages, like:
- high productivity and speed - this technique, in fact, allows to obtain large quantities of plastic parts in a short time, ensuring the dimensional repeatability;
- possibility of obtaining complex shapes and geometries, impossible to obtain otherwise;
- very high precision;
- reduction of production costs through automation of the entire thermoplastic moulding process.
The most common materials involved in thermoplastic moulding
Plastic stamping process requires different types of thermoplastic polymers which, according to their physico-chemical characteristics, are divided into:
- amorphous or semi-crystalline (depending on the structure)
- standard polymers or engineering polymers (depending on temperature resistance)
The plastic materials most commonly used for injection moulding include: PC polycarbonate, ABS styrene copolymers, PMMA polymethyl methacrylate, PEI polyetherimide, PPS polyphenylene sulfide, PBT polybutylene terephthalate, PPO polyphenylene thione, polyoxymethylene POM, polyarylamide IXEF, nylon PA 6 and PA 66, polypropylene PP.
Can thermoplastic polyurethane be used in injection moulding?
Idea Stampi manufacturers and markets thermoplastic polyurethane materials (TPU). These TPU polymers can be processed by a variety of techniques including injection moulding. Thermoplastic polyurethane injection moulding is easy to perform and the material can be transformed into shapes such as grips, gaskets, caps, orthotics & prosthetics, as well as many other applications. However, for this to be done effectively you need the right machinery and the right injection moulding parameters. Idea Stampi is capable of processing injection moulding on thermoplastic polyurethane materials thanks to its know-how and its mould precision.
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Which mold for thermoplastic polyurethane injection molding?
Most traditional molds will well perform with thermoplastic polyurethanes. In the process you can expect a mold shrinkage percentage of between 0.4% and 1.4% depending on the hardness of the TPU being used and the wall thickness of the part being made.
Idea Stampi: injection molding since 1986
Idea Stampi is specialized in injection molding and micro-injection molding. The production of injection molds is realized for different production volumes, depending on the customer’s needs: for small series, for medium volumes and for large volumes.
In all these cases, the molds produced by Idea Stampi guarantee a high level of precision, durability and resistance: the goal is, in fact, to satisfy to the maximum the requirements of the customer. For this reason, it is widely involved in all stages of the process, from the design to the testing of the molds.
In addition, upon request, Idea Stampi also offers its customers an injection molding service for plastic materials. Thanks to the versatility of the technique, a high level of productivity can be achieved in a short time, while reducing production costs and obtaining accurate and quality products.
Do you want to deal with thermoplastic injection molding? Idea Stampi is the perfect partner!
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