闽台台塑PP 5090T

PP的市场前景:
PP有着广阔的应用前景。随着高分子材料加工设备的不断进步和增容技术手段的提高，越来越多的共混体系可以采用动态硫化技术进行加工，这必将会导致一系列性能优良、成型加工方便、设计灵活的热塑性硫化胶出现，传统的硫化橡胶应用领域将越来越多地被热塑性硫化胶所取代，PP在工业领域和生活消费领域的应用必将得到更为迅猛的发展.PP在我国的销量已一个月大约70万吨左右，目前中国是世界上用量的消费国，随着生活的多姿多彩PP产品越来越多，让消费者感受到科学的优越性。
PP molding characteristics:1. Crystalline material, hygroscopicity is small, easy to occur melt fracture, long-term contact with hot metal is easy to decome.
2. PP has good fluidity, but its shrinkage range and shrinkage value are large, and it is easy to produce shrinkage cavity, dent and deformation.
3. The cooling speed is fast, the pouring system and cooling system should slow heat dissipation, and pay attention to control the molding temperature. When the material temperature is low temperature and high pressure, it is easy to orientate. When the mold temperature is lower than 55 ℃, the plastic parts are not smooth, easy to produce poor fusion and flow marks, and warpage deformation occurs when the temperature is above 95 ℃. Glass fiber is the main reinforcement material, which can significantly improve the tensile strength of PP plastics. Generally, the content of glass fiber is less than 40%. It is generally considered that when the fiber length is greater than 0.2 mm, the effect is better when the diameter of glass fiber is more than 10 microns. With the increase of glass fiber content, the processing fluidity of reinforced PP decreases correspondingly, but it is still a kind of plastic with good fluidity

PP成型特性：
1.结晶料，吸湿性小，易发生融体破裂，长期与热金属接触易分解。
2.PP流动性好，但收缩范围及收缩值大，易发生缩孔，凹痕，变形。
3.冷却速度快，浇注系统及冷却系统应缓慢散热，并注意控制成型温度.料温低温高压时容易取向，模具温度低于55度时，塑件不光滑，易产生熔接不良，流痕，95度以上易发生翘曲变形。玻璃纤维是主要的增强材料，可以显著提高PP塑料的拉伸强度。玻纤含量一般不**过40%，一般认为在纤维长度大于0.2mm时有改性效果，其玻纤的直径在十几个微米时效果较好。玻纤含量时，增强PP的加工流动性相应下降，但仍属流动性较好的塑料

PP process introduction:PP melting temperature: 225-285c, do not exceed 280C. PP mold temperature: 42-82c, 52C is recommended. The degree of crystallization is mainly determined by the mold temperature.
Injection pressure: up to 1850 bar.
PP injection speed: the use of high-speed injection molding can reduce the internal pressure to the minimum. If there are defects on the surface of the product, low-speed injection molding at higher temperature should be used.
PP runner and gate: for cold runner, the typical runner diameter range is 5-8mm. It is recommended to use the injection port and runner with round body. All types of gates are available. Typical gate diameters range from 1-1.5mm, but Gates as small as 0.8mm can also be used. For edge gates, the minimum gate depth should be half the wall thickness; the minimum gate width should be at least twice the wall thickness.

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