Polycarbonate solid sheets can be seen everywhere in daily life, such as carports and bus station awnings. All of these applications are outdoors, and the biggest problem they face is ultraviolet rays. You should know that the penetration of ultraviolet rays will break the macromolecular chains in the plastic, and the plastic will degrade, which is the so-called plastic aging. The performance of plastics will decrease with aging, and the obvious phenomenon from the appearance is that the plastic will change color, become brittle, and break easily. Therefore, the ability to defend against ultraviolet rays becomes the key to the life of the solid polycarbonate sheet for the awning. We examine it from two aspects: anti-uv adding process and single-sided and double-sided anti-uv.
The earliest anti-uv adding method is the coating process. This process is simple and crude, and is achieved by directly applying anti-uv agent on the surface of solid polycarbonate sheet for canopy. Although this adding process can also resist ultraviolet rays, it is easily affected by the outside world. The erosion of rain and wind and sand will cause a lot of loss of anti-uv coating, and it will soon be worn out. The result is that the solid polycarbonate sheet loses its protection and will age after a few months. Therefore, this backward process has also been eliminated.
Then, the mixed co-extrusion adding process appeared in the industry. This process is to mix PC raw materials with UV raw materials before producing solid polycarbonate sheet achieve anti-ultraviolet effect. This process can extend the life of the sheet better than the coating process, but it is limited to the principle of mixed co-extrusion. The distribution of PC raw materials and anti-UV particles is uneven. Neither the performance of PC nor the anti-UV performance can be brought to the extreme, and the life span reaches about 5 years.
At present, the best method of adding solid polycarbonate sheet in the industry is film composite co-extrusion. The principle of this process is to form a layer of anti-ultraviolet co-extrusion layer directly on the surface of solid polycarbonate sheet during co-extrusion to achieve the anti-uv effect. The anti-uv co-extrusion layer formed by this process is uniform and dense. The PC layer and the anti-uv layer are independent of each other and can play the best performance. It is much better than the coating process and mixed co-extrusion, and the service life is extended to 10 years or more.
In the past, many manufacturers added an anti-uv layer to the sunny side of the solid polycarbonate sheet of the awning, but later people found that even with a better adding process, the PC endurance board of the awning could not play the longest theoretical service life. Why is this? This needs to be analyzed from the propagation path of ultraviolet rays.
60% of the ultraviolet rays in the sun are transmitted through direct radiation, and 40% are transmitted through diffuse reflection. Buildings, glass curtain walls, asphalt roads, smoke and dust suspended in the air, etc. can all cause ultraviolet rays to reflect and diffusely reflect. Ultraviolet rays can be said to be everywhere. Therefore, 40% diffusely reflected ultraviolet rays will cause damage to the shady side of the Polycarbonate sheet of the awning, and naturally it will not be able to play the longest life.
Therefore, double-sided anti-uv panels can play the longest theoretical life, and can also protect solid polycarbonate sheet in the following situations. First, vertically applied panels will be exposed to ultraviolet rays at different angles in a day, and double-sided UV can block them well. In addition, double-sided anti-uv panels can also prevent workers from making mistakes in identifying the situation of facing the shady side to the sun, which can protect polycarbonate panels from multiple aspects and angles, and the service life is longer.
In the past, double-sided anti-ultraviolet solid polycarbonate sheets were mainly imported from Japan, and the price of imported sheets was high. However, there are domestic manufacturers that can produce mature double-sided anti-uv polycarbonate sheets for rain canopies. Baoding Xinhai Plastic Sheet Co., Ltd. is one of them. Its product, SINHAI Over 10 Years solid polycarbonate Sheet, is a double-sided UV product.
The in-film composite co-extrusion technology can make the anti-uv layer and the PC impact-resistant layer completely independent and bonded together. The thickness is as high as 50μm. Calculated at an annual loss of about 2-3μm, the service life of SINHAI Over 10 Years Solid polycarbonate sheet is more than ten years. Moreover, the solid roller of the solid sheet production line has a greater pressure than the hollow roller of the domestic machine, which can completely plasticize the anti-uv layer and densely cover the surface of the polycarbonate solid sheet, which can better protect against UV damage.
Company Name: Baoding Xinhai Plastic Sheet Co.,ltd
Contact Person: Sale Manager
Email: admin@cnxhpcsheet.com
Phone/Wechat/Whatsapp: +8619932587617
Country: China
Website: https://www.xhplasticsheet.com/
Post time: May-31-2024