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Because the products produced with multi-cavity die tend to lose dimensional accuracy, it is more appropriate to use the mold with small cavity when producing precision tolerance products.
When the plastic enters the mold cavity, the air inside the mold must be discharged.Improvements in mold design. The increasing use of formwork removal and air ejector and rapid injection have made the shape and location of the exhaust system more important.The design of exhaust system has become an important part of mould design.The designer provides as many exhaust devices as possible for rapid and uniform filling of the die cavity by analyzing possible flow paths.
In order to fill the mold cavity, the processing temperature must be high enough, but low enough for rapid cooling (for thermoplastic plastics).Cooling efficiency depends on the cooling medium into the people and leave the difference in temperature, volume and velocity of the cooling medium flows through the channel, characterization of laminar and turbulent Reynolds constants and chemical properties of the cooling medium.Designers will all kinds of effective data input computer, changes in parameters such as the diameter of the hole, position, length, the number of the cooling circuit, and distance on the surface of the die and mould materials, engineers can select the best design.
The waveguide column and bushings have been used extensively to ensure the half mode alignment without lateral displacement.Until now, they have been widely used, but in cases where high alignment is required, guide posts are usually supplemented or replaced by tapered clamping devices.
Special molds for special moulds include multilayer molds, insert molds, two-color molds, injection blow moulds and co-injection molds.