In modern manufacturing, rapid prototype rubber parts injection molding technology has gradually become a key means to improve production efficiency and product quality. Especially the application of Liquid Silicone Rubber (LSR) provides tremendous advantages to this process.
Liquid Silicone Rubber (LSR) is a non-toxic, heat-resistant, and highly resilient flexible thermoset material. Its rheological properties are characterized by low viscosity, rapid curing, shear thinning, and a relatively high coefficient of thermal expansion. These properties make LSR the ideal material for manufacturing rapid prototype rubber parts. LSR is typically divided into A and B compounds, which are quantitatively mixed in a 1:1 ratio. After thorough mixing with a static mixer, the compound is injected into the injection molding system. This process not only enables one-time molding but also effectively reduces waste and supports automated production, significantly improving production efficiency.
LSR is widely used in the medical and healthcare industries, including sealed infusion systems, dialysis filters, hearing aid components, baby pacifiers, nipple shields, household appliance intake valves, and medical device components. Its excellent thermal stability, cold resistance, electrical insulation properties, elasticity, waterproofing, moisture resistance, and chemical resistance make LSR the preferred material for manufacturing rapid prototype rubber parts.
In the injection molding process of rapid prototype rubber parts, LSR as a bi-component liquid material is accurately mixed in a 1:1 ratio. The mixed material enters the plastification system, which has homogenization and mixing functions. The mixed material is injected into a hot mold via a screw system. At mold temperatures of 170–200°C, the LSR undergoes a curing reaction. This injection molding technique enables LSR to precisely shape complex rubber parts. Additionally, because a cold runner system is used, the mold's runner must be kept sufficiently cool to avoid leakage. Once injection is complete, the needle valve immediately seals the nozzle, ensuring precise forming of the product.
In the production of rapid prototype rubber parts, the selection of the feeding system is crucial to molding quality. Common feeding systems include:
This system is capable of moving up and down to feed materials, maintaining stable pressure. A and B pumps are synchronized through hydraulic and pneumatic control to ensure feeding reliability and accuracy.
A general-purpose pump that can only feed in one direction, suitable for scenarios that do not require synchronized feeding.
This pump is designed with a check valve to prevent backflow of materials, ensuring feeding stability.
Typically used in conjunction with a unidirectional pump, suitable for applications that require high precision in material metering.
Through these feeding systems, manufacturers can choose suitable configurations based on production needs to optimize the injection molding process of rapid prototype rubber parts, thereby enhancing production efficiency and product quality.
Overall, the injection molding process of rapid prototype rubber parts fully utilizes the excellent performance of LSR through precise mixing, temperature control, and feeding systems, ensuring the production of high-quality rubber parts. This technology not only improves production efficiency but also provides reliable solutions for various industrial applications.
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