Plastic steel doors and windows are a kind of building doors and windows commonly used in our family. In the market, plastic steel doors and windows occupy half of the country. White has always been the main color of plastic steel doors and windows, but after several years of development, colored plastic steel doors and windows have become a new hot spot for market consumption. Color plastic profiles are divided into color coating, color whole, two-color co-extrusion several production methods and technical processes. The first two methods are subject to quality and cost constraints, and development is limited, and the two-color coextrusion method is the focus of research. This method is to extrude two different colors of the same kind or different kinds of materials into one whole, forming a plurality of methods of co-extrusion of PM-MA-PVC, ASA-PVC and PVC-PVC, which is optimistic for enterprises and markets.
According to the manufacturer, the ASA material not only resists degradation, aging, and fading caused by ultraviolet radiation, but also does not cause decomposition or discoloration in the oxidation and high temperature during processing. The test results show that the aging resistance of ASA is ABS. More than 10 times.
The number of swing doors and windows has increased dramatically, accounting for 90% of the total. The speed of localization of hardware fittings, insulating glass processing equipment and seals matched with energy-saving doors and windows has accelerated, and the production cost of energy-saving doors and windows has been reduced, and market sales have increased.
The overall door and window processing speed is accelerating. A few years ago, China's foam PVC door and window processing was still a blank, and today's domestically produced such products have been able to be extruded at one time to achieve localized production. Not only quickly occupied the domestic market, but also exported to more than 40 countries around the world.
However, in the development of plastic steel doors and windows, especially the plastic-steel swing doors and windows have been widely loved by consumers, mainly because of its high cost performance, and superior functions in sound insulation and energy saving sealing.
A spectacle blind or spec blind, is a safety device used to isolate a section of line or piece of equipment when the line or equipment needs to be inspected or removed from service. It is different than a valve in that the blind is a permanent or long term isolation device.
A spectacle blind is machined from a single piece of metal that is cut to match the pipe size, fit between two pipe flanges and requires an additional Gasket when it is installed. Also, the bolts will need to be lengthened depending on what piping class and size blind is used. The thickness of the spectacle blind is specified based on the line pressure and pipe size.
The specification that determines the dimensions of a spectacle blinds is ASME B16.48 - Line Blanks. A line blank conforming to this standard will be marked in the following way:
B16
Nominal Pipe Size (NPS)
Nominal Pressure Class
Material
Manufacturer's Name
If RTJ, the ring number
One end of the blind will have an opening to allow flow through the pipe during operation and the other end is solid to block flow during maintenance
Spectacle Blind Flange , Figure 8 Flange , Spacer & Spade , Spectacle Blank , Pandle Spacer
Shijiazhuang Bang dong Pipeline Technology Co,Ltd. , http://www.bd-pipefitting.com