Injection Molding Process | Thermoplastics

Rotating-core injection molding process increases
burst strength and reduces the detrimental effects of knit lines

Manufacturing News Center - Solvay Advanced Polymers is building a development tool to evaluate additional benefits, including improvements in dimensional stability

Alpharetta, Ga-October 14, 2004-Jobwerx News-In conventional injection molding, cylindrical or conical sections within complex parts are formed by flowing thermoplastic material around a stationary core. A molding process patented by Solvay S.A. has been shown to improve the strength of such parts by injecting the material onto a rotating core.

Two-fold and greater strength increases have been demonstrated in parts molded of semi-crystalline polymers reinforced with glass or minerals or both. The improved burst strength is achieved, in part, by the ability of the process to produce a preferred orientation in the material itself. On a macro-molecular level, the polymer chains become arranged around the circumference of a cylindrical or conical part – like the reinforcing belts under the tread of a radial tire – rather than simply along the flow path of the injected plastic. The reinforcing fibers are also arranged in this direction, greatly increasing the part’s ability to withstand internal pressure.

Rotating the core during injection also reduces the detrimental effect of knit lines or weld lines – areas formed when flow fronts meet, which results in incomplete material or fiber interaction across the front and introduces mechanical weakness.

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