Injection molding processing factory of transparent plastic defects and solutions

Here only discuss influence injection processing product defects of transparency, other defects, please refer to the company of injection molding processing product manual or other information. About the following: (its defects A) Silver lines: the mold filling and condensation process, the internal stress anisotropy effect, should be
force produced by the vertical direction, the resin flow occurs on the orientation, and produce different refractive index and non-current orientation and flash silking, after its
extension, may make the product appear crack. ( 2) Bubble: master in resin vapour and other gases not to go out, ( In the process of mould condensation) Or due to insufficient filling mould, the cooling surface and the
rapid condensation to form a 'vacuum'. ( 3) Injection processing product surface gloss poor: the Lord to mold roughness, premature condensation on the other hand, the resin can't copy the mold surface state, all of which make the surface to produce tiny uneven, and make the product lose luster. ( 4) Seismic lines: refers to from the sprue as the center to form dense corrugated, the reason for the melt viscosity, the front-end material has condensation, mold material to break through again after
the condensing surface, and make the surface seismic lines. ( 5) White fog, dizzy: mainly because of the dust in the air into raw material or raw material moisture content is too large,
. ( 6) White smoke, black spots: mainly due to the plastic inside the barrel, due to local overheating and make the barrel resin solution or deterioration.





most of the injection pressure injection tooling set


plastic injection mold factory injection molding processing and the control of injection pressure can be divided into usually is an injection pressure, the secondary injection pressure ( The holding) Or more than three times the injection pressure control. Pressure switch timing is appropriate, to prevent the pressure in the mold is too high, and prevent excessive or lack of material is very important. Mold volume depends on the holding stage gate closed when the pressure and temperature melting. If every time a switch from pressure to product cooling stage of the pressure and temperature are consistent, then the products of the volume will not change. Plastic injection mold factory in constant molding temperature, injection tooling decided the holding pressure is the most important parameters in dimension, the most important variable to affect the products size tolerance is the holding pressure and temperature. Example: at the end of the mold filling, the holding pressure reducing immediately, when the surface to form a certain thickness, the holding pressure rise again, so that we can with low molding mould clamping force thick wall of large products, eliminate the collapse pit and flash. Plastic mold factory is usually a plastic injection molding processing and the holding pressure and speed filling cavity when the pressure and speed of 50% ~ 65%, namely the holding pressure lower than the injection pressure is about 0. 6 ~ 0. 8MPa。 Due to the holding pressure is lower than the injection pressure, in a considerable pressure keeping time, oil pump load is low, the service life of solid fuel pump to extend, at the same time, it reduces the power consumption of the oil pump motor. Three-level pressure injection can make smooth filling mould parts, and there will be no weld line, sag, flash and warping deformation. For thin-walled parts, long small, long process large stamping molding, even cavity configuration is not balanced and not too tightly clamping parts molding is good.