Mold Best Assurance Company Limited
Simply accessing monitoring data online, in real time, can help you address underperforming tools and build new ones when needed.
For the first-time multishot molder, equipment selection is often a daunting task. Should the molder invest in a new or used two-shot press? Would it be best to use an existing press with open capacity and convert it to a two-shot machine?
All three tooling methods allow molders to combine two or more resins. They can be combined in two general ways—chemical or heat/melt bonding or through a mechanical or interlock bond. Chemical bonds are created when one material molecularly binds to another, in effect creating an adhesive resin skin between first-and second-shot materials.
When it comes to the injection mold, its design and construction are determined by the relationship and shape of the two materials used to create the part. The multishot mold style will determine the specific kind of multishot press and any ancillary equipment required to mold the part.
Multishot molding adds significant value to plastic products: soft-touch enhancements (for hand tools, toothbrushes, razor handles, writing instruments); performance improvements via molded-in gaskets, o-rings, seals; permanent graphics through the use of additional colored resins; and part functionality with in-mold-assembly techniques.
Companies that don’t engage and then decry the lack of skilled workers, need to take a step back, according to Ginsburg. “I think for industry to say, ‘They should just show up at my front door so I can plug them in,’ that’s not the way it works.
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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