PVC pipe is a kind of plastic pipe made of polyvinyl chloride resin, stabilizer, lubricant, etc., which is extruded by hot pressing. PVC pipe, full name Polyvinylchlorid, is mainly composed of polyvinyl chloride. In order to enhance its heat resistance, toughness and ductility, other ingredients will be added. This article will introduce in detail How pvc pipes are manufactured?
How PVC pipes are manufactured?
1. Raw materials need to be prepared, mainly including PVC resin, stabilizer, lubricant, filler, etc. Among them, PVC resin is the main raw material used to manufacture PVC pipes, accounting for about 70% of the total raw material cost. The role of the stabilizer is to prevent the degradation and aging of PVC resin during processing, the role of the lubricant is to improve the processing performance of PVC resin, and the role of the filler is to reduce the cost of PVC pipes and improve some of its properties.
2. Mixing and preheating: Mix all raw materials evenly according to the formula ratio and premix them at an appropriate temperature to ensure the uniformity and stability of the raw materials. Then, the raw materials through the preheating system to reach a temperature range suitable for extrusion.
3. Extrusion: Use a single-screw extruder or a twin-screw extruder to extrude the preheated raw materials through the die head. The temperature control of the extruder is the key, including the temperature control of the feeding section, plasticizing section, homogenizing section, and molding die to ensure that the molten PVC has the desired shape.
4. Cooling and shaping: The extruded PVC pipe is quickly cooled by a cooling device to maintain its shape and dimensional stability. The cooled PVC pipe is further shaped by a shaping device to ensure the uniformity of its diameter and wall thickness.
5. Traction and cutting: The shaped PVC pipe is pulled to the specified position by a tractor, and then the PVC pipe is cut into standard lengths (such as 3M per pipe) by a cutting machine. It can also be cut into customized lengths according to customer requirements.
6. Printing and inspection: Print the brand logo, specifications, implementation standards, and other general information on the body of the PVC pipe. After printing, the finished product is inspected for quality, including the inspection of indicators such as appearance, size, mechanical properties, and flame retardancy, to ensure that the product quality meets the standards and customer needs.
7. The manufacturing process of PVC pipes involves processes such as raw material preparation, mixing, plasticizing, molding, cooling, and packaging. Each process parameter needs to be strictly controlled to ensure the quality and performance of PVC pipes.
Advantages and characteristics of PVC pipes
1. Physical properties: PVC pipes have excellent surface hardness and tensile strength, high safety factor, small linear expansion coefficient, small deformation under temperature, small thermal conductivity and elastic modulus, and excellent anti-freezing performance.
2. Corrosion resistance: PVC pipes have very good corrosion resistance to inorganic acids, alkalis, salts, and other substances, are suitable for industrial sewage discharge and transportation, and have good resistance to ripening. They can withstand corrosion from various chemical media, including acid resistance, alkali resistance, corrosion resistance, etc.
3. Service life: The service life of PVC pipes can reach more than 50 years, with good anti-aging properties, and can block ultraviolet rays and radiation, so that the product will never fade.
4. Convenient installation: The connection of PVC pipes can be made by bonding, which is simple in construction, easy to operate, and has high installation efficiency.
5. Environmentally friendly and non-toxic: The raw materials of PVC pipes are composed of carbon and hydrogen, without any toxic heavy metal salt stabilizers. They have passed the inspection of national authoritative agencies and are the best pipes for tap water piping. They do not harm water quality (sanitation and non-toxic).
6. Lightweight: PVC pipes are light in weight, which can greatly reduce transportation costs and installation construction intensity.
7. Good water tightness: Whether the installation of PVC pipes is connected by bonding or rubber rings, they have good water tightness.
