SPI Mold Surface Finish:
The surface finish of injection molded plastic parts is directly influenced by the finish of the mold itself. Designers must clearly communicate the required surface finish specifications for molded plastic parts to the mold manufacturers. This ensures that the final product meets the desired visual and functional requirements.
To facilitate effective communication between product designers, engineers, and mold manufacturers, the Plastics Industry Association (SPI) has established standardized surface finish guidelines for injection molds. These standardized finishes are referred to as SPI Mold Finishes. This section will explore the various SPI surface finishes, their associated roughness values, and the recommended applications for plastic parts.
Surface Finish of Injection Molded Plastic Parts:
Designers typically specify the required SPI surface finish directly on the part drawings. The mold is then polished to match the specified surface finish of the part. As a result, the surface finish of the mold is directly transferred to the injection molded plastic parts. According to the SPI standard, the following SPI mold finishes are commonly used to achieve the desired surface finish on molded plastic parts:
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