Mold Best Assurance Company Limited
Careful consideration should always be taken to part design and the chosen material, as both play significant roles in sink and warp of injection molded plastic parts.
Surface finishes play a critical role in both functionality as well as the cosmetic look and feel. Parts that are hidden may not require a surface finish at all, where exposed components might need to be visually appealing.
A popular design feature, injection molded threads give you the ability to fasten your plastic parts to other components securely with relative ease.
The injection molding process is fairly simple, plastic resin is heated to its melting point and forced through the machine and into your mold to produce your plastic parts. The leading edge of the molten material is often the coolest point and the closest to solidifying.
Stereolithography uses a UV laser to photo-cure large vats of epoxy based resin in the shape and form of an electronic 3D file. During selective laser sintering, as the stereolithography (SLA) laser moves along the vat, three dimensional parts are built layer by layer on a tray that sits just below the top of the resin line.
Selective Laser Sintering is a layer additive production process that creates three dimensional objects using a CO2 laser to melt, or sinter, and fuse selective powder molecules based on information supplied by a computer aided design (CAD) file.
Not only injection mold temperature determines melt temperature as it moves quickly through the mold. The melt temperature itself as it starts its journey through the injection mold (self-evidently) is the reference point. Speed of injection, particularly in thin sections, is of huge influence, as it will determine the degree of shear heating.
Many engineering materials like PBT (Polybutylene terephthalate) have a tendency of out-gassing. The best practices that I have to date are: Add 10mm wide vents spaced 30mm from each other all the way around parting line. Always follow the recommendations of the material company for vent depth.
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