Injection molding

The injection molding is refers to each kind of injection molding product general designation injection molding which produces by the injection molding machine, including each kind of packing, components and so on. Was mainly after materials and so on polyethylene or polypropylene and increased many kinds of organic solvents made. The plastic choice mainly decides in the plastic type (thermosplasticity or thermosettingness), the outset shape as well as the product contour and the size. The manufacture plastic injection molding parts injection molding uses the mold pressing, the transmission compression molding generally, also uses the injection molding. The lamination, the mold pressing and the hot formation are cause the plastic to take shape in the plane. The above method, may use in the rubber processing. In addition, but also has take the liquid state monomer or the polymer as raw material casting and so on. In these methods, squeezes out with the injection molding uses many, is also the most basic formation method.
The injection molding main technological parameter includes:

1. material tube temperature: The melt material temperature is very important, shoots the material plastic injection moldings cylinder temperature which uses is only the guidance. The melt rubber temperature may shoot the mouth place measurement or the use air spray method measures. Shoots the material cylinder's temperature hypothesis to be decided by the melt rubber temperature, the screw rod rotational speed, the back pressure, shoots estimates with the injection molding cycle. If you have not processed some specific rank plastic the experience, please from lowest hypothesis start. For ease of the control, shot the material cylinder to divide the area, but was not all establishes for the same temperature. If the operation time long or operates under the high temperature, please the first area's temperature hypothesis for the low value, this prevent the plastic premature melting and the divergence. Before the injection molding starts, guarantees the hydraulic fluid, the hopper sealer, the mold and shoots the material cylinder to be under plastic injection mould the correct temperature.

2. melt material temperature: The melt temperature plays the leading role to the melt flow properties, as a result of the revertex concrete melting point, the so-called melting point has not been under a molten state temperature section, the revertex member chain's structure and the composition is different, thus is also different to its fluid influence, the rigid molecular chain is been obvious the temperature effect, like PC, PPS and so on, but flexible molecular chain for example: plastic injection PA, PP, the PE uniform flux mobility is not obvious through the change temperature, therefore should act according to the different material to correct the reasonable injection molding temperature.

3. mold temperatures: Because some plastic materials the crystallization temperature is high, the plastic injection mouldings crystallization velocity is slow, needs to compare Gao Muwen, somewhat as a result of the control size and the distortion, or the drawing of patterns need, must the high temperature or the low temperature, like PC requests above generally 60 degrees, but PPS to achieve the good outward appearance and the improvement fluidity, sometimes the mold warm needs above 160 degrees, thus the mold temperature to improves the plastic injection mold product the outward appearance, the distortion, the size, the jello mold aspect has the function which cannot arrive estimates.

4. injection pressures: The melt overcomes the resistance which the advance needs, the immediate influence product's size, the weight and the distortion and so on, the different revertex product must the injection pressure to be different,plastic injection molding regarding looks like materials and so on PA, PP, will increase the pressure to cause its fluidity obviously to improve, injection pressure size decision product density, namely outward appearance glossiness. It does not have the fixed value, but the mold fills is more difficult, the injection molding pressure also increases.