PP Socket Head Screws

The characteristics of PVC plastic include excellent heat resistance, low density, good mechanical properties, good chemical properties, and non-reactivity with most chemicals; in addition, it can be used in machinery and automobile manufacturing parts, electronic and electrical industrial devices, construction, and so on.

1. Heat resistance is excellent: pp products can be used for a long time in a high-temperature environment below 100 degrees, and the temperature of 150 degrees or so will not be significantly deformed.

2. The density is small: 0.81---0.91g/㎝3, the most negligible density among the commonly used plastics.

3. Pp material has good mechanical properties, high heat resistance, good chemical properties, almost no water absorption, no reaction with most chemicals, a pure texture, non-toxicity, and good electrical insulation.

4. No drying treatment is needed if it is stored properly.

5. The back pressure of the melt can be 5 bar, and the back pressure of the color powder material can be adjusted more appropriately.

6. The melting point is 160-175 ° C, and the decomposition temperature is 350 ° C. However, in the injection process, the temperature setting can not exceed 275 ° C, and the mold temperature is 50-90 ° C. For the size of the higher requirements of high mold temperature, the core temperature is lower than the cavity temperature of 5 ° C or more.

7. Injection pressure: using higher injection pressure and holding pressure, holding pressure is about 80% of the injection pressure. About 95% of strokes occur with a longer holding time when turning pressure.

8. Injection speed: To reduce internal stress and deformation, high-speed injection should be chosen, but for engraved patterns on the surface of the dark and light streaks spread by the gate, low-speed injection and a higher mold temperature are necessary.

9. Mold. General runner four has a 7mm, needle-shaped gate length of 1 1.5mm, and the diameter can be as small as 0.7mm. Edge-shaped gate length, the shorter the better, about 0.7mm, the depth of half the wall thickness, the width of the wall thickness of twice, and with the length of the melt flow in the mold cavity gradually increased, the mold must have a good exhaust, exhaust holes deep 0.025mm a 0.038mm, 1.5mm thick, to avoid Shrink marks should be used with a large and round injection port and round runners, the thickness of the reinforcement should be small.

10. pp melt viscosity with the increase in shear speed and a significant decline in the temperature is less affected.

Plastic PP Socket Head Screws in various industry's application solutions

1. Mechanical and automotive parts: polypropylene has good mechanical properties and can be directly manufactured or modified to manufacture a variety of mechanical equipment parts; Plastic PP Socket Head Screws in the manufacture of industrial piping, agricultural water pipes, motor fans, infrastructure templates, and other industries play a role in fastening connections. Modified polypropylene can be molded into bumpers, anti-scratch strips, automobile steering wheels, instrument panels, interior decorative parts, etc., significantly reducing the body's weight to save energy.

2. Electronic and electrical industrial devices: Plastic PP Socket Head Screws can be used to make the insulation shell of household appliances and washing machine liners, commonly used in wire and cable and other electrical insulation materials. They are using the weight of homopolymer polypropylene 60 ~ 80 parts, ethylene - vinyl alcohol copolymer 20 ~ 40 parts, compatibilizer (polypropylene maleic anhydride graft and ethylene - vinyl alcohol copolymer reactants) 1 ~ 10 parts, at 170 ℃ ~ 190 ℃ under the conditions of the polypropylene composite materials made of mixing with high toughness, its impact strength of up to 210J / m, with a high gas barrier properties, water vapor rate of close to 2000g - m, the water vapor rate of close to 2000g - m, the water vapor rate of close to 2000g - m. The water vapor rate was close to 2000g-μm/(m2-24h). In the preparation of barrier films, the traditional film-making process can be used for production; the process is relatively simple and produces at a low cost.

3. Construction: polypropylene fiber is the lightest of all chemical fibers. Its density is (0.90 ~ 0.92) g / cm3, with high strength, good toughness, chemical resistance and anti-microbial properties and low prices, etc., reinforced with glass fibers modified or rubber, SBS modified polypropylene is used in large quantities in the production of construction templates foamed polypropylene can be used to make decorative materials. In the event of an earthquake, polypropylene fiber ceramic concrete damage pattern for plastic damage, no fragment spalling. The selection of polypropylene fiber granulated concrete is safer than vegetal granulated concrete.

4. Agriculture, fisheries, and food industry: polypropylene can be used to make greenhouse canopies, mulch, culture bottles, agricultural tools, fish nets, etc., the production of food crates, food bags, beverage bottles, and so on. Reactive blending with waste PET (polyethylene terephthalate) to make multi-functional waste PET, multi-functional waste PET, and polypropylene in-situ fiber composite materials made of in-situ fiber composite. The composite material has waste PET to form shaped microfibers, waste PET microfibers, and PP matrix resin to form a moderately flexible potent combination of interfaces and other structural features. Waste PET, and PP composite fiber materials prepared in situ toughness and rigidity are significantly higher than the PP, and the mechanical properties of the reproducibility are relatively good. China's annual production of PET waste resources has significant economic and social benefits.

5. Textile and printing industry: polypropylene is the raw material of synthetic fibers, polypropylene fibers are widely used in producing lightweight and beautiful durable textile products, the application of polypropylene materials printed on the screen is exceptionally bright, bright and beautiful.

6. Other industries: in the chemical industry, Plastic PP Socket Head Screws can be used in the preparation of a variety of corrosion-resistant pipelines, tanks, valves, packing towers in the shaped filler, filter cloth, corrosion-resistant pumps and corrosion-resistant container lining; in the pharmaceutical industry can be used for the production of medical equipment, internal structure of the fastening connection; polypropylene can also be grafting, composite and blending process, to achieve the development of the energy sector. Polypropylene can also be utilized in the energy field through grafting, compounding, and blending.