What is a pvc pipe?
PVC materials have various uses, and the key points are soft PVC and hard PVC.
PVC pipe (PVC-U pipe) is a kind of hard PVC pipe, which is made of PVC resin, thickener and lubricating liquid. And extruded by a pressing method. It is a kind of plastic pipe that has been developed, designed and applied. PVC-U pipe has strong corrosion resistance, easy adhesion, low price and hard material. However, due to the leakage of PVC-U and additives, it is only suitable for water supply systems with transportation temperature not exceeding 45℃. Plastic pipes are used in drainage pipes, sewage, chemicals, heating and freezing liquids, food, ultra-pure liquids, mortar, gas, air compression and ultrafiltration devices.
PVC can be divided into soft PVC and hard PVC. Among them, hard PVC accounts for about 2/3 of the market and soft PVC accounts for 1/3. Soft PVC is usually used on the surfaces of wood floors, ceilings and leather products. However, because soft PVC contains tackifier (which is also the difference between soft PVC and hard PVC), its physical properties are weak (if the water inlet pipe must bear a certain pressure, soft PVC is not suitable for application), so its application scope is limited.
Rigid PVC has no tackifier, easy molding, good physical properties and great research and development value. In the production of polyethylene materials, many modifiers, such as thickener and tackifier, must be added. If all environmental modifiers are selected, PVC pipes are also nontoxic and odorless environmental products.
What are the characteristics of pvc materials?
1, harsh processing technology
PVC can often be widely used in decoration industry for two important reasons: first, PVC has unique properties (waterproof, rainproof, fireproof, antistatic and easy to form), and second, PVC has the characteristics of low capital investment and high output. PVC film has the characteristics of light weight and flame retardancy, which ensures the high quality of PVC film. Therefore, from all aspects, PVC is a commodity with low capital investment and high output.
Melting temperature: 185 ~ 205℃ Mold temperature: 20 ~ 50℃
Injection working pressure: up to 1500bar. Pressure test working pressure: up to 1000bar. Injection rate: In order to prevent the material from dissolving, it is usually necessary to use a very high injection rate.
Overflow channel and gate: All common gates can be applied. If small parts are produced and processed, needle gate or submerged gate should be used; For thick members, fan gate is applied. The aperture of needle gate or submerged gate shall be1mm; The wall thickness of the sector gate shall not be less than 65438 0 mm.
2, the performance is different
Generally, the film is glued to the surface of the material immediately at room temperature, so the glass film is very easy to fall off after one or two years. The PVC film is attached to the surface of the material by a common vacuum pump film press at a continuous high temperature of 1 10 degrees, and it is not easy to fall off.
PVC is completely harmless and tasteless, and has no irritation to body skin or respiratory tract. For people who are allergic to wood and patent leather, furniture or kitchenware packed with PVC film is especially suitable. According to the application of PVC film as decorative film, it can prevent the use of plywood, man-made board and plywood, reduce the amount of wood, and then reduce the damage to the jungle and even the natural environment.
The application of PVC once caused great opposition in European and American countries, and many people tried many other materials to replace PVC. But in fact, the quality of PVC is comparable to other substitutes, and the cost is more cost-effective.