TPU Injection Molding

A: TPU's can typically be injection molded on reciprocating screw injection molding machines. The melting curve regards a TPU depends on the amount of crystallinity a specific TPU has. In general the harder the TPU product, the more crystalline the product is.

A: TPE is generally lighter, softer, more flexible, and a bit easier to recycle than TPU. However, these desirable qualities come with some sacrifices: Compared to TPU, TPE is less resistant to abrasion, grease, oils, chemicals, and extreme temperatures, especially cold.

A: Therefore , TPU injection molding temperature control between 200 ° C ~ 240 ° C is more appropriate.

A: Wall thickness: The recommended wall thickness for TPU injection molding is between 0.5mm and 5mm. Thicker walls can lead to longer cooling times and higher production costs, while thinner walls can result in warping or deformation of the finished product.

A: Prolonged exposure to UV light can cause TPU to degrade over time and become brittle, discolored and lose its physical properties. It is not recommended to use TPU in applications that will be exposed to UV light for extended periods of time. TPU is also resistant to oils, chemicals, and weathering.

A: Injection pressure should begin near the lower end of machine range; an initial setting of 25% would be a good starting point. Similarly set towards the low end of each operation range, set back pressure to 50-75psi., and screw speed @ 40-75 RPM.