POM POM Typical Applications

POM POM Typical Applications: POM has a grp/frp pipelin coefficient of friction and good geometric stability, particularly suitable for the production of gears and bearings. Because it also has high temperature properties, it is also used for pipe device (valve, pump GMC car dvd gps), lawn equipment.
injection molding process conditions: drying: If the material is stored in a dry environment, typically does not require drying. Melting temperature: homopolymer material 190 ~ 230C; copolymer material is 190 ~ 210C. Mold temperature: 80 ~ 105C. In order to reduce shrinkage after molding mold can choose higher temperature. Injection led waterproof Switching Power Supply: 700 ~ 1200bar. Injection rate: medium or high injection speed. Runners and gates: You can use any type of gate. If you use the tunnel-shaped gate, it is best to use a shorter type. Polymer materials are recommended for hot runner nozzle. Copolymer materials for use within the hot runner can also use external runner.
chemical and physical properties: POM is a tough, flexible material, even at low temperatures is still very good creep properties, geometric stability and impact resistance properties. POM materials have both homopolymer copolymer material. Homopolymer material has a very good extension strength, fatigue strength, but not easy to process. Copolymers have good thermal stability, chemical stability and ease of processing. Both homopolymer or copolymer materials materials are crystalline materials and are not easily absorb moisture. The high crystallinity of POM cause it has a very high shrinkage rate can be high up to 2% to 3.5%. For a variety of enhanced materials have different shrinkage.
PP polypropylene Typical applications: Automotive (mainly using metal additives PP: fenders, vent pipes, fans, etc.), equipment (dishwasher door gasket, dryer vent pipe, Washing machine frame and cover, refrigerator door gaskets, etc.), consumer goods (such as lawn and garden equipment, lawn mowers and sprinklers, etc.).
injection molding process conditions: drying: If stored properly you do not need drying. Melting temperature: 220 ~ 275C, careful not to exceed 275C. Mold temperature: 40 ~ 80C, recommend the use of 50C. The degree of crystallinity determined by the mold temperature. Injection pressure: can be as large 1800bar. Injection speed: In general, high-speed injection can reduce internal pressure to a minimum. If the product surface defect, then you should use a high temperature low-speed injection molding. Runners and gates: For cold runner, the typical flow channel diameter is 4 ~ 7mm. Recommend the use of whole body is circular sprue and runner. All types of gates can be used. The typical gate diameters range from 1 ~ 1.5mm, but can also be used as small as 0.7mm gate. For the edge of the gate, the minimum wall thickness of the gate should be half the depth; minimum wall thickness of the gate width should be at least twice. PP material can use the hot runner system.
chemical and physical properties: PP is a semi-crystalline materials. It is to be more rigid than PE and has a higher melting point. As the type of PP homopolymer is higher than the temperature above 0C is very brittle, so many commercial PP material is added 1 to 4% of the random copolymer of ethylene or a higher ratio of clamp-stage ethylene content copolymer. PP copolymer-based material has a lower heat distortion temperature (100C), low transparency, low-gloss, low rigidity, but a stronger impact strength. Strength of PP increased with increasing ethylene content. Vicat softening temperature of PP is 150C. As a high degree of crystallinity, the surface of the material properties of stiffness and good resistance to scratches. PP does not exist environmental stress cracking problems. Typically, the use of glass fiber, metal additives or thermoplastic rubber modified PP method. PP turnover ranges from 1 to 40 MFR. Low MFR better impact properties of PP material, but to extend the lower intensity. MFR for the same material, copolymer-based homopolymer-type intensity ratio is higher. As the crystal, PP shrinkage rate is very high, typically 1.8 to 2.5%. And uniformity of shrinkage in the direction other than the PE-HD materials are much better. With 30% glass additive can make shrinkage to 0.7%. Homopolymer and copolymer type of PP-based materials have excellent renault megane car gps dvd to moisture absorption, resistance to acid corrosion, anti-solubility. However, it aromatic hydrocarbons (eg benzene) solvents, chlorinated hydrocarbons (carbon tetrachloride) solvents such as no resistance. PP did not like PE still has a high temperature oxidation resistance.
PPE polypropylene Typical Applications: Anal Products dishwashers, washing machines and other electrical equipment such as the controller shell, fiber coupling and so on.
injection molding process conditions: drying: It is recommended prior to processing for 2 to 4 hours, 100C for drying. Melting temperature: 240 ~ 320C. Mold temperature: 60 ~ 105C. Injection cool schoolbags: 600 ~ 1500bar. Runners and gates: You can use all types of gates. Particularly suitable for use handle-shaped gate and fan gate.