The history of the development of wallpaper:
As early as the Tang Dynasty in China, some people painted on paper to decorate the wall. In the mid-18th century, the British Morris began mass production of printed wallpapers, with modern wallpapers. With the changes of the times, the development of wallpapers has continued to develop with the development of the world economy and culture. It has experienced the development of paper, paper painting, foam paper, printing paper, embossed paper and special craft paper. process.
Like other decorative materials, wallpapers are constantly evolving with the development of the world economy and culture. The use of wallpapers in different periods is a reflection of the comprehensive factors of local economic development level, new materials science and popular consumer psychology.
The original wallpaper was drawn on paper and printed with various patterns. It has a certain decorative effect, but it is also limited to the high-level places such as the royal court for local decoration. Really large areas with other decorative materials into the home life, or in the late 1970s and early 1980s.
Throughout the 1980s, it was the period when foamed wallpapers prevailed. "Foaming" was also called netting relief foaming. It refers to the addition of a foaming agent to the raw materials, which is supplemented with high temperature during the production process, so that the foaming agent completes a process similar to "fermentation". Therefore, the wallpaper produced will have a concave and convex feel, and the hand feels soft. The advantage of this type of wallpaper is that it has a strong sense of three-dimensionality and can increase the sense of space in the room. But the shortcomings are also obvious: not wearable, easy to scratch, easy to get dirty. At present, foamed wallpaper has gradually been eliminated, but it is still visible on the ceiling of some rooms.
In the late 1980s, with the development of the plastics industry, there was a substitute for foamed wallpapers - rubber-coated wallpaper. This kind of wallpaper does not foam, so the texture is hard, which greatly improves the disadvantages of the foamed wallpaper. Waterproof, moisture-proof, durable, exquisite print, embossed texture, can display a variety of patterns and patterns on the wallpaper, its color expression, practicality has created a new page of wallpaper development. At present, the use of rubber-faced wallpapers in the world accounts for about 70%.
At the beginning of the introduction of the rubber-faced wallpaper, the silky wallpaper with a glossy texture is very popular. In the later period, with the trend of the house decoration industry changing, the matt matte wallpaper (clothing wallpaper) gradually led the trend. Wallpapers are becoming more and more powerful in terms of color and pattern, and are widely welcomed by consumers. The major manufacturers have launched fierce competition for this.
From the late 1990s to the beginning of the 21st century, cloth-like wallpapers became popular. It is expected that in 2002, as human demand for leisure, comfort and environmental protection grows, green and environmentally-friendly products will be accepted, consumers. The demand for paper wallpaper will further increase.
The popularity of current wallpapers in Japan and Russia is close to 100%, and in Europe and the United States, there is also a 50%-60% penetration rate. The current penetration rate in China is less than 1%! With the development of China's economy, people's living standards Constantly improve, I believe that wallpaper as a necessities of life, will definitely fly into the homes of ordinary people!
Flanged Ground Screw For Solar Energy Mounting system .different size flange ( head plate ) ,usualy flange size is 220*8mm ,200*8mm ,with square flange,round flange,hexagon flange ,triangle flange .
Helix flanged Ground Screw made of carbon steel Q235 ,standard of DIN EN ISO 1461-1999 .
Flange Ground screw parameter are as below :
Ground screw pipe diameter :60mm,68mm,76mm,89mm,102mm,114mm
Ground Screw pipe thickness :2.5mm,2.75mm,3.00mm,3.75mm,4.00mm,4.5mm
Ground Screw Pile length : 1000mm,1200mm,1400mm ,1500mm,1600mm,1800mm,2000mm,2100mm,2500mm,2700mm,3000mm .
Ground Screw material : carbon steel Q235
Surface treatment : hot dip galvanized .according to standard :DIN EN ISO1461-1999 ,average thickness of zinc coating :85micron
Drawing force parameter :10.7-28.5KN
Bearing capacity :20-40KN
Horizontal torsion parameters :4.5-10.5KN
packing :steel pallet
Flanged Ground Screw For Solar Energy Mounting
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