plastic injection products
If that workpiece material Banzhu cold near the gate to fog or bright colors with stripes or the like from the starting gate if the worm attached to the top of the curved scar, plastic injection products they are from the plastic into the cavity due to excessive forward or packing role of the material was squeezed into the cavity caused by the cold, because the radio Tsui or forward material flow of cooling to the heat transfer in the cavity before the part is cooled into the cure, when the expansion through the narrow gate and into the cavity, the the formation of melt fracture, and immediately after the hot melt material was later pushed own, so he became the cold material spot.
Solution:
(1) cold material well to create good. Also consider the gate on the form, size and location, to prevent the material of the cooling rate gap.
(2) radio Tsui Centre degrees should be fine, shoot Tsui and feed on the mold with a good size to design to prevent leakage of material or cause a cold material to be brought into the cavity.
(3) a good degree of mold exhaust. Gas interference would occur opacity of the gate stripe.
(4) increase mold temperature. Slow injection speed, increasing the injection pressure, injection time to reduce the packing and reduce the holding pressure.
(5) Dry good plastic. Less lubricant to prevent the powder was contaminated.
[ Author: simon] [ Date: 5/20/2010 ] [ Hits: ]
