The history of the revolutionary development of PVC plastics

AlthoughPVC hose has some unique properties that are not found in natural materials, it has disadvantages such as low strength, poor heat resistance, and large linear expansion coefficient. Therefore, PVC hose hose often needs to be reinforced when producing door and window profiles. The general method of reinforcement is to insert metal material into the cavity of the profile and carry out secondary reinforcement. Almost all of the so-called “PVC hoses” on the market are produced by this method. However, this method of reinforcement cannot fundamentally solve the problem. Therefore, how to perform a one-off composite extrusion process of reinforcing material and PVC hose has been a subject of research. Foreign countries have advanced technology in this area.
Although PVC hose has some unique properties that are not found in natural materials, it has disadvantages such as low strength, poor heat resistance, and large linear expansion coefficient. Therefore, PVC hose hose often needs to be reinforced when producing door and window profiles. The general method of reinforcement is to insert metal material into the cavity of the profile to perform secondary reinforcement. Almost all so-called “plastic steel doors and windows” on the market are produced by this method.
However, this method of reinforcement cannot fundamentally solve the problem. Therefore, how to carry out one-off compound extrusion processing of reinforcing materials and PVC has been a subject of research. In foreign countries, PVC hose technology is relatively advanced, and steel-plastic composites, aluminum-plastic composites, wood-plastic composites and other profiles have long been introduced. These composite profiles are mainly used for structural materials and load-resistant components except for door and window profiles. There are also domestic manufacturers launched plastic composite doors and windows, can be described as genuine “plastic” doors and windows.
The earliest and simplest example of compound extrusion of PVC hoses is the well-known wire and cable. The more popular products in the past two years are aluminum-plastic composite pipes. Although the technical principles are the same, the technical difficulties of composite extrusion of rigid PVC profiles with steel sheets or profiled steels are much higher. The difficulty lies in the following: the compound extrusion die is more complex; the coextruded hard material cannot be wound like a copper wire; the bonding of the composite material to the PVC needs to be pre-treated and so on.