SPI Mold Surface Finish
The surface finish of injection molded plastic parts is crucial and is directly influenced by the finish of the mold itself. It is essential for designers to clearly communicate the required surface finish specifications to mold manufacturers to ensure the final product meets visual and functional requirements.
The Plastics Industry Association (SPI) has established standardized surface finish guidelines for injection molds, known as SPI Mold Finishes. These guidelines facilitate effective communication between product designers, engineers, and mold manufacturers. This section explores various SPI surface finishes, their roughness values, and recommended applications for plastic parts.
Surface Finish of Injection Molded Plastic Parts
Designers typically specify the required SPI surface finish on part drawings, and the mold is polished to match this specification. Consequently, the mold’s surface finish is transferred directly to the injection molded plastic parts. Commonly used SPI mold finishes according to the SPI standard help achieve the desired surface finish on molded plastic parts.
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