In the plastic injection molding machine barrel, why there are so many bubbles?
Is the baked material suitable?.Back pressure is not appropriate?.
There are two kinds of pores in the material. The first one contains moisture, and the raw material should be dried completely before processing, or at least 5% of the drier will be added during processing. The second is the material decomposition, to reduce the barrel temperature, reduce the melt pressure and speed, set the melt back pressure, but not too high; or adding appropriate amount of stabilizer in the raw material, it is not only a refueling.
Injection molding machine, also known as injection molding machine or injection machine. It is a thermoplastic or thermosetting plastic plastic molding mold made of plastic products of all shapes of the main molding equipment. It is divided into vertical, horizontal and all electric type. The injection molding machine heats the plastic, applying high pressure to the molten plastic to make it crack and fill the mold cavity.Injection molding machine barrel in the bubble is mainly divided into the following categories:Air bubble: the screw speed is too fast or the size of particles, irregular shape of the grinding material and other reasons, causing the raw material feeding time and space, gas is involved in the trip bubble.Water vapor bubbles: raw materials poor drying moisture content is too high, resulting in a large number of water entering the water vapor bubble formation in the barrel.Gas bubbles: raw material heating temperature is too high or too long residence time in the barrel (long heating time) caused by material degradation produce gas, gas bubbles travel.
