In the short mold core or cavity shallow (less than 5 mm) cone angle of at least 0.25 ° per side, when deep cavity and core increased from 1 to 2 inches (25.4 ÷ 50.8 mm) cone angle should increase 2 ° on each side. Bevel angle necessary for Plastics Polyolefins and Acetals and small size only 0.5 ° bevel angle, but for large-sized products, taper angles can request up to 3 °. With harder materials such as Polystyrene, Acrylic, ... even for the small size, the minimum taper angle of 1.5 ° must. Noting that the smaller cone angle, requires greater thrust; so can damage the product if the product is not yet fully hardened.
When not designing drainage angle or improper design mold, the friction between the surface and the mold product will be great. Meanwhile, the product will be trapped in the mold or if the matter ejected in the product surface will also fail, taking in too big push to do Thun surface.
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