Reaction Injection Molding Factory Low Volume Manufacturing Big Parts Quickly And Economically
Reaction Injection Molding (RIM, also named Low-Pressure Injection Molding) is an ideal process to low volume manufacturing the large plastic parts quickly and economically. Firstly, the liquid bi-component polyurethanes are injected into a mixer at certain amount ratio and meanwhile mixed well by the mixer, then the mixture is injected into the tooling cavity quickly at room temperature and low pressure to form the parts.
Reaction Injection Molding Process Steps:
Mixing: two liquid polyurethanes are mixed together in a mixer at certain amount ratio.
Injection: the mixed liquid polyurethanes are injected into mold cavity under low pressure and room temperature.
Reaction: The liquid mixture reacts and cures inside the mold cavity and forms a solid part.
Demolding: The solid part is manually taken out from the mold cavity.
The fairly low viscosity of the bi-component polyurethanes delivers high flowability that allows for the low injection molding pressure as well as temperature, which brings the feasibility of low tooling performance. So our RIM toolings are mostly made of epoxy resin and silicone rubber (sometimes aluminum or ABS) instead of mold steel.
One advantage of RIM is its ability to produce large parts with a smooth and high-quality surface finishing, as well as the complex geometries and intricate details. Another advantage of RIM is its ability to produce parts with high strength and durability, which makes RIM parts ideal for applications that durability is a critical factor, such as industries of automotive, medical devices, aerospace, etc.
This was an Engine Casing that was originally manufactured by the sheet metal fabrication with lots of welding. To save cost, customer modified the design of this casing to be Reaction Injection Molded. The different wall thicknesses of 5/7/10/20 mm brought challenge to shrinkage control.
Industry Applications:
RIM is commonly used in the low volume manufacturing or prototyping of automotive, aerospace, medical devices, and consumer goods parts. Such as automotive bumpers & grills, body panels, interior components, aerospace ducting, large enclosures, big housings and medical covering shells.
We are respected in RIM industry in China, the RIM service we send out to global market are quick, economical and quality that are proven by the customers used our service, especially from automobile field. We look forward to doing more and better by our continuously improving RIM expertise and experience.
One shot of injection molding time was around 40 seconds. More big size and volume of the part, More time of the reaction injection molding. Insert Molding and Overmolding were also feasible for our RIM process. 4 stainless steel M6 nuts were inserted for injection molding.
Due to the low injection molding temperatures and pressures, RIM is well-suited for molding large parts with variable wall thickness and smooth surface finishes. We can also benefit from its relatively high turnover rate, which makes it proficient in handling low to middle volume production projects. In addition, RIM parts have high tensile strength, heat resistance, and good resistance to corrosive acids or solvents. However, prolonged exposure to sunlight can degrade polymer-based parts.
The high strength of our RIM parts had our RIM process low volume manufactured the large shell parts properly, economically and quickly. The finished RIM parts for delivery. The parts were packaged economically and safely to be delivered by cheap sea freight that took around 25 days.
Quality and Service are the true reasons that HONKIA survives and grows up in the market since our establishment. We saw some of our competitors are making money by playing around the quality and then lose the market faster than we think. We do know that is not a sustainable business pattern.
How does HONKIA compare to other suppliers on price?
Compared to other Chinese suppliers, we choose not to compete on price but to offer the high level of quality, rapid response, and professional results. That’s why some customers cooperate with us for many years, compared with the price, they need a reliable partner to avoid serious losses caused by annoying after-sales service or even the trouble of finding no one.
What if I am not completely satisfied with the parts I receive?
HONKIA will free remake or amend the returned parts that you are not completely satisfied, or refund the full arrived payment, though this is rarely happened in the past. Any disputes based on a subjective or unilateral determination shall be discussed and negotiated to reach a reasonable result. Our continuing business relies on earning your confidence in our ability to meet and exceed the reasonable expectations.
