Performance test. For mass production of plastics, vacuum drying or vacuum should be used. It is difficult to add materials during molding. For water-absorbent plastics (such as polysulfone, polymethyl, etc.) must be dried before molding. If the color masterbatch is added to the raw material, the effect is better. The following plastic mold manufacturers will introduce how to carry out the inspection and pre-heat treatment of the raw materials: Inspection and pre-heat treatment of the raw materials.

The plastics used for small batch production are mostly dried by hot air circulating drying oven and infrared heating oven. Some products require no color or transparency. For plastics with poor thermal stability, it will cause discoloration, degradation, and dry plastics should be used immediately, otherwise it should be properly stored to prevent further moisture.

The method of drying treatment should be selected Full automatic PET bottle blowing machine Manufacturers according to the properties of plastics and the amount of production.), as long as they are packaged, transported, and stored well, they generally do not need to be dried.. Before the injection molding, the inspection and pre-heat treatment of the raw materials must be done. Otherwise, defects such as streaks, silver filaments and air bubbles will appear on the surface of the plastic product, and even the polymer will be degraded during molding. The appearance and process of the raw materials should be processed before molding. Generally speaking, the temperature is high, the time is long, and the drying effect is good, but the temperature should not be too high, and the time should not be too long. The desired colorant should be added to the raw material before molding.

Seriously affect the quality of the product. Dry, good effect, short time. The contents include color, particle size and uniformity, fluidity (melt index, viscosity), heat stability, shrinkage, moisture content and the like. Polystyrene and ABS plastics are also often dried. For plastics that are not easy to absorb water (such as polyethylene, polypropylene, etc. The drying effect has a great relationship with temperature and time.How to carry out inspection and preheating of raw materials? In order to make the injection molding go smoothly, the quality of the plastic products is guaranteed. If the temperature exceeds the glass transition temperature or melting point, the plastic will agglomerate

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