1.Cleaning barrel. The purpose of cleaning, such as barrel Central Plains has accumulated material, not cleaned on a forming operation, will bring great impact on the quality of plastic parts produced, in order to ensure the quality of plastic parts. Must clean the barrel.
  Cleaning method. If you want to take some plastic parts production, should first production of light color, low melting temperature of injection molding machine, plastic parts of the poor thermal stability, so it is convenient to clean, easy to reload. If the temperature is a new metal forming than the barrel leftover material temperature is high, should the barrel and nozzle temperature rise to the lowest temperature of processing new material, then adding new material for the continuous air injection, until the exhaust residue after increasing barrel temperature, nozzle temperature requirements for temperature, adding new material into production. If the temperature is a new metal forming than the barrel leftover material at low temperature, the barrel and nozzle temperature rise to make the materials left in a state of flow best, then cut off the heating power, adding new material with the barrel temperature is clean, the new material to new material processing temperature, and then transferred to the production. The product is heat sensitive materials left, such as barrel cleaning PVC, POM, PCTFEF3 etc, in order to prevent the decomposition of plastics, should use the two steps, namely, first with good thermal stability of plastic, such as PS, LDPE and other raw materials of transition refueling cleaning, then the processing of new material replacement transition cleaning materials. The cleaning agent. Either direct or transition refueling refueling, will consume a lot of raw material waste caused by the transition. The material barrel cleaning agent, effect is good, but also save money. It is suitable for cleaning of processing temperature range of injection molding machine barrel heat of 180 degrees -280 degrees of plastic. Cleaning method. The plunger type injection molding machine cleaning, because a large amount of memory material cylinder, and is not easy to rotate, cleaning more difficult, should be removed or using special barrel. Screw injection molding machine cleaning, usually by changing the cleaning, cleaning should understand the molding temperature range the barrel leftover material and new material, thermal stability and different kinds of plastic compatibility condition, in order to develop specific cleaning method.

2.insert preheating. The purpose of warm-up. Insert after preheating temperature, material and melting in the molding shrink, slow down inserts the surrounding melt cooling rate, shrinkage rate is relatively uniform, thermal material certain feeding effect, reduce the insert around
  The internal stress, help to reduce the block crack generated around and not reducing strength. Preheating range. Not all inserts in the molding requires preheating, such as the small insert, is easy to melt in the mold can be heated, no preheating; while for larger insert, and has a rigid molecular bonding of plastic, such as PC, PS, PSF, PPO and so on, they are easy to produce stress cracking, this kind of insert will generally require preheating. Preheating temperature. Preheating temperature to not shredded bamboo shoots embedded metal coating on the surface of the coating is limited, on the insert, usually 110-130 degrees, no coating surface of aluminium or copper insert, preheating temperature can increase to 150 degrees.