The molding properties of PP sheet in detail
2023-11-23 15:18How is PP sheet produced
PP sheet is PP resin by beer out, calendered, cutting and other processes and made, with light weight, surface bright and calm, good heat resistance, high mechanical strength, excellent chemical stability and electrical insulation, non-toxic and other characteristics, through thermoforming can be made into beverage cups, food boxes and other daily necessities.
Molding proportion of PP sheet
PP sheet is polypropylene plastic, specific gravity :0.9-0.91 g/cubic centimeter molding shrinkage :1.0-2.5% Molding temperature: 160-220℃. The density is small, the strength and stiffness can be used at about 100 degrees. It has good electrical properties and high frequency insulation and is not affected by humidity, but it becomes brittle at low temperature and is not resistant to mold aging. Suitable for making general mechanical parts, corrosion-resistant parts and insulating parts.
PP sheet formability
1. Crystallized material, small hygroscopic, easy to melt rupture, long-term contact with hot metal easy to decompose.
2. Good fluidity, but the shrinkage range and shrinkage value are large, and shrinkage holes are easy to occur. Dents, deformations.
3. The cooling speed is fast, the pouring system and cooling system should slowly dissipate heat, and pay attention to controlling the molding temperature. The direction of low temperature is obvious. It is especially obvious at low temperature and high pressure, when the mold temperature is below 50 degrees, the plastic parts are not smooth, easy to produce poor welding, leave marks, and warping deformation is easy to occur above 90 degrees.
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