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Low pressure injection is a prototype manufacturing process suitable for rapid prototyping manufacturers. It mixes polyurethane materials and injects them into rapid molds at room temperature and low pressure, forming products through chemical and physical processes such as material polymerization, cross-linking, and curing. Low pressure injection is suitable for small batch production in the product development process, as well as the production of structurally simple coverings and large thick and uneven wall thickness products.
Low pressure injection utilizes automotive prototype production to create simple molds. This process can produce products as large as car bumpers and medical carts, with a suitable quantity ranging from 15-2000 sets. In the field of automotive RIM low-pressure injection, such as bumpers, fenders, steering wheels, instrument panels, air intake grilles, door panels, front end modules, airbag covers, and other automotive interior and exterior decorations, Sijunda Hand Panel Factory has accumulated a large amount of production experience and technical methods.
Low pressure infusion process flow: Monomers or prepolymers enter the mixing head in a liquid state through a metering pump in a certain proportion for mixing. After the mixture is injected into the mold, it quickly reacts and crosslinks within the mold, and after demolding, it becomes the RIM product.
Low pressure injection molding has the following characteristics:
The process of low-pressure injection molding is not only determined by dynamics and thermodynamics, but also influenced by physical conditions;
The curing time of the material is relatively long, and the curing and cooling of the material occupy the vast majority of the time;
The formed material has thermosetting properties;
The processing is carried out under low pressure, so it is only suitable for rapid prototyping with simpler product structures.
The materials used in low-pressure injection molding are mainly polyurethane materials. By changing the mixing ratio of the materials, different material elastic moduli can be obtained to obtain the required material properties. The physical properties of the cured material are similar to ABS, PP, or PS. This process is suitable for the production of hand board products with larger wall thickness and uneven wall thickness.
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