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The nozzle tip insulator is made of Polyimide material (Vespel SP-1 Equivalet), used for injection molding thermoplastic such as PET bottle preforms. As thermal insulation of molten plastic to prevent freeze-off of the plastic while awaiting injection inside the hot runner system, and allowing easy color transfer between production batches, reducing downtime of the tool.
Polyimide(PI) is a product family that includes five types of this high performance polyimide resin. The unfilled grade is ideal for electrical and thermal insulation applications, while filled grades maximize the benefits of low wear, low friction, high strength, high chemical resistance, and excellent performance under extreme temperature conditions.
Lubricated or unlubricated, parts made of Polyimide(PI) offer designers exceptional flexibility to meet the demands of harsh operating environments. The material is also easily machined to tight tolerances with standard metal-working equipment.
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