Since polyethylene PE material is a crystalline polymer, the grains have to absorb certain heat when melting, so the barrel temperature should be 10 degrees higher than its melting point.

The molecular weight over 100,000 is ultra-high molecular weight polyethylene PE material. The higher the molecular weight, the better the physical and mechanical properties, and the closer to the level of engineering materials required.

Because polyethylene PE material has the above qualities and is easy to process and mold, polyethylene PE material recycling is of great value.

Increasing the injection pressure is conducive to the melt filling the mold, due to the good fluidity of PE, so in addition to thin-walled slender products, should be fine to choose a lower injection pressure, the general injection pressure of 50 ~ 100MPa. simple shape. After the wall of larger plastic parts, injection pressure can be lower, and vice versa is high.

The Problem An injection molder needed to determine the feasibility of using a co- injection molding process to reduce the manufacturing cost of a plastic chair. The chair was to be manufactured using a virgin talc-filled polypropylene for the skin resin, and a regrind talc-filled polypropylene for the core resin. In order to justify the higher cost of building a co- injection mold the chair had to consist of at least 30% regrind.

Polyethylene PE material under the action of the atmosphere, sunlight, and oxygen will be aging, discoloration, cracking, brittle or chalking, and lose its mechanical properties.

The higher the molecular weight, the more difficult it is to process. The melting point of polyethylene PE material is 100-130C, and its low-temperature resistance is excellent. It can still maintain good mechanical properties at -60℃, but the use temperature is 80~110℃.

The barrel temperature is mainly related to the density and melt flow rate of polyethylene PE material, but also to the type and performance of the injection molding machine and the shape of the first-level plastic part.

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50-95C. Higher mold temperatures should be used for wall thicknesses below 6mm and lower mold temperatures for wall thicknesses above 6mm.

For LDPE, the barrel temperature is controlled at 140-200℃, and the barrel temperature of HDPE is controlled at 220℃, with the rear of the barrel taking the minimum value and the front taking the maximum value.

At the plastic injection molding and processing temperature, the melt will also decrease in its kill degree due to oxidation, and discoloration and streaking will occur, so care should be taken during the molding and processing and use process or when selecting materials.

Polyethylene PE material is a typical thermoplastic, which is an odorless, tasteless, non-toxic, and flammable white powder. Polyethylene PE material for the molding process is extruded and granulated waxy granule material with a milky white appearance. Its molecular weight is in the range of 10,000 to 100,000.

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The cooling temperature of the part should be uniform to minimize the difference in shrinkage rate. For optimal cycle time, the cooling cavity diameter should be not less than 8mm and the distance from the mold surface should be within 1.3d (where “d” is the diameter of the cooling cavity).

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Mold temperature has a greater impact on the crystallization condition of the plastic parts, high mold temperature, high crystallization of the melt, high strength, but shrinkage will also increase. Usually, LDPE mold temperature control at 30 ℃ ~ 45 ℃, while the HDPE temperature is correspondingly higher at 10 ~ 20 ℃.