Mechanical reasons, for example, due to abnormal conditions, the barrel is overheated, the resin is decomposed at high temperature, burned and injected into the product, or the nozzle and screw threads, check valves and other parts in the barrel cause the resin to stagnate, decompose and discolor and bring it into the product, leaving dark brown burn marks in the product.
At this time, the nozzle, screw and barrel should be cleaned. The mold reason is mainly due to poor exhaust. This burn usually occurs in a fixed place and is easy to distinguish from one situation. At this time, attention should be paid to taking measures such as adding exhaust grooves and anti-exhaust rods.
In terms of molding conditions, when the back pressure is above 300MPa, the barrel will be partially overheated and cause burns. When the screw speed is too high, overheating will also occur, generally in the range of 40 to 90r/min. When there is no exhaust groove or the exhaust groove is small, the injection speed is too high to cause overheated gas burns.
Through inspection, determine the deformation and damage of
New Car plastic accessories. Tightening: Tightening is an important maintenance operation to prevent loosening of machine parts. The necessary tightening and replacement of New Car plastic parts should be carried out. Cleaning: The basis for reducing the wear of New Car plastic parts and reducing energy loss.
Adjustment: Adjustment work is an important place to ensure that the various assemblies and New Car plastic parts of
Fuel Car can work normally for a long time. Replenishment: Replenishment work refers to the refilling and replenishment of the vehicle's lubricating oil and special working fluids during the maintenance of Fuel Car, so as to enhance the service life of the vehicle assembly and various parts.
