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Nylon reaction injection molding to manufacture complex parts

Source: Honkia Prototype   Published: 2016-08-09   Views: 329

Polyamides are semi-crystalline polymers. It has very good mechanical properties, good fatigue strength, good wear resistance, good sliding properties. Polyamides absorb different amounts of moisture, which also affect the mechanical characteristics as well as the dimensional accuracy. When producing semi-finished products, a distinction is made between the extrusion and casting processes. The casting process allows the production of polyamide composite products with larger dimensions and a higher degree of crystallinity (mechanical strength), resulting in less internal tension. The extrusion process, however, is a more economical production process.

Reaction Injection Molding Process

Reaction injection molding can be used for a variety of industries. Reaction injection molding provides designers more design freedom and can effectively produce more complex parts than other molding methods. The successful utilization of Reaction Injection Molding (RIM) to manufacture complex polyurethane parts in a single step from relatively low viscosity streams has led to a search for other chemical systems which can be manufactured by the Reaction Injection Molding process. The rapid polymerization of molten caprolactam by anionic catalysis has been utilized to develop attractive nylon Reaction Injection Molding systems. The incorporation of a rubber segment in the polymer chain allows the manufacture of high impact or even elastomeric nylon parts. The combination of a rubber phase with the high melting crystalline nylon phase provides useful properties at low temperatures as well as at elevated temperatures.

RIM Part

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