The UPVC resin as main raw material added with a certain proportion of stabilizer, coloring agent, fillers, or ultraviolet light absorbers is squeezed to form profile which is made into door and window sashes by cutting, welding and screw joint, then the sashes are decorated with sealing joint strips, wool tops and hardware fittings, etc., or embedded with steel lining (reinforced bars) in the cavity with certain length for enhancing the rigidity of profile, and such kind of door and window is called plastic-steel door and window.
Plastic-steel door and window are commonly-used in households, obtaining 50% of market shares. White is always the dominant tone of plastic-steel door and window, but over years, colorful plastic-steel door and window has becoming a new hot spot in the market. There are several production technologies or processes of colorful coating, colorful entirety, two-tone coextrusion employed for colorful plastic-steel profile, but the former two methods are restricted due to quality and cost, and two-tone coextrusion method is the focus of our research. It will integrate the same or different materials in two colors by extrusion e.g. PM-MA-PVC, ASA-PVC or PVC-PVC, looks promising.
As manufacturers say, ASA for its part can not decompose or fade under circumstances of oxidization in atmosphere and high temperature processing, besides resisting degradation, aging and fading caused by ultraviolet irradiation. The test results show its aging resistance is 10 times or more that of ABS.
Side-hung door and window are leaping on the market, accounting for 90% already. The accelerated domestication of hardware fittings matched with the energy-saving doors and windows, hollow glass processing equipment and sealing elements promotes the cost reduction of energy-saving doors and windows, and the market sales volume increase.
The processing of integrated doors and windows speeds up now. Our country still had no ability to make PVC door and window a few years ago, but now, we realize one-time extrusion molding and domestication successfully. The products rapidly occupy the domestic markets, and are exported to over forty countries in the world.
However, plastic-steel side-hung doors and windows are especially popular with consumers, mainly because of its higher cost performance and superior properties in aspects of acoustic insulation, thermal insulation, and energy conservation and sealing.