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Injection Molding Guide - Lubrizol

POLYMER SOLUTIONSI njection Molding Guide2 Injection Molding Guide IntroductionLifeScience LifeSciences is a business within The Lubrizol Corporation that provides innovative polymer solutions for healthcare products. Among the chemical technologies employed by LifeSciences are thermoplastic polyurethane elastomers (TPUs). LifeSciences TPUs are grouped into several families of products with varying chemical and physical characteristics. They can be readily converted to durable, tough, impact-resistant articles such medical device housings, tubing connectors, etc., on conventional thermoplastic Injection - Molding brochure is intended to provide general guidelines for equipment, procedures and Molding machine conditions that will help the customer obtain the best possible performance from the the Lubrizol LifeSciences of TPU Molding grades.

A straight, open nozzle with a full internal taper tip is recommended. A positive-shut-off, antidrool nozzle can be helpful but is not a necessity. If the particular machine or mold design requires a long nozzle or a nozzle extension, it should be well insulated with heater bands so that there are no cold spots. The harder TPU compounds,

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injection pressure minimizes the possibility of producing highly stressed parts. This is significant because many new thermoplastic polyurethane molded parts are painted, and paint systems require baking for 30 minutes at 122°C (250°F). Under these conditions, any molded-in stresses would relieve and the result would be a distorted part.

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