The gate position plays a decisive role in the shape of the cutting edge and the effect of the pressure pressure, so the strength and other properties of the molded parts are also determined.
In view of the location of the gate, which is usually specified by the injection molding parts designer and mold designer, this article is specially written for these personnel.However, injection molding manufacturers should also begin to participate in the planning phase to avoid problems that can be foreseen.
Improper positioning of gate position may cause adverse effects.
Parts made of semi-crystalline engineering polymers are designed correctly, but their performance can be damaged if the gate position is incorrect.Both enhanced resin or not enhanced resin, the following symptoms are clearly illustrates its performance is affected: flow front shape caused by melting the fusion line and air air pockets may affect the appearance of the parts, especially reinforced fiber material, its mechanical performance will be to.Changing the processing conditions will not help.
If the gate is located in the thinner part of the mould, the part of the thick wall will form contraction marks and gaps.Although the thick-walled part requires a longer time to maintain pressure, the material is crystallized faster in the thin-walled part (FIG. 1), and the thick-walled part will no longer be supplied with molten material.As a result, in addition to producing optical and mechanical problems, it also increases the shrinkage in the thick-walled region, and in non-enhanced plastics even causes warping deformation.