Steel doors and windows have a good seal

Steel doors and windows in recent years for its good tightness and quickly occupied the market, and steel doors and windows sealed and become a national focus on the promotion of building materials, and its excellent sealing doors and windows sealed with plastic credit are inseparable, doors and windows to activity on both sides and bottom of the doors and windows must be no gaps, the only way to easy to open and close. . However, these gaps also makes noise, dust, stepped in, and impact on indoor thermal insulation, the formation energy waste, in general, the gap through the house windows and doors building a total amount of heat is usually about 12% of heat loss. Thus, a good seal on the doors and windows a great influence on the quality, the sky's the main seal sealing strip is particularly critical, its quality directly determines the merits of the quality windows and doors. tamper seals
China is now widely used seals are nitrile rubber (NBR) and polyvinyl chloride (PVC) blend made of PVC, which both ozone resistance and oil resistance of NBR and cross-linking, has good physical mechanical properties, its main source of raw material PVC-rich, low prices, it has widespread applications. By working in different ways, sealing strips can be divided into two kinds of silicified and non-silicified, GB GB12002-89 for plastic door and window seals to make a more detailed set of quality standards for referrals. Silicified seal is used over oil-treated polypropylene yarn manufactured after treated with silicone oil seal waterproof doors and windows can significantly improve performance, while aging resistance, flexibility, lodging resistance has a significant increase. In the industry standard JC/T635-1995 made it clear seal must be siliconized.
Seal root is a plastic substrate, and its aging resistance, low temperature brittleness also need the right formula and quality raw materials to ensure that, otherwise it will directly affect the seal life. If both sides of the base plate on the addition of the sealing flap side down easily, can improve the sealing performance of the sealing strip as a whole, extending its life, and in the assembly process to reduce hair seal groove and seal profiles catching phenomenon.
Structurally sealing strip can be divided into common type and intermediate sandwich type. On the basis of the latter in the former, an increase in the middle of the sealing hair a siliconized polyethylene film or a nonwoven fabric to completely hermetically sealed air flow gap between the hair, so that the sealing interlayer seal seals better than 5 times normal above. With its windows and doors made of air permeability can reach the highest national level standards. security tie
Because plastic doors and windows is the result of the overall welding, seal damaged can not be replaced, so the seal windows and doors directly affect the life of a whole life. From the above analysis, we can see both sides and there is silicified laminated seal flap sealing performance, life is much better than the low-grade sealing strip (low seal life of three to five years, high-grade seal service life 20 ~ 30 years), but its price is higher than the low-grade seals (seal low priced at 0.16 yuan / m, while the high price of 0.8 yuan seal / m). Although the seal only 2% of the cost of the entire plastic window, plastic window industry, but because of intense competition, 90% of domestic enterprises is not high quality seal, door seal material currently on the market, plasticized PVC sealing strip material share of 90%, while the industry authorities recommend using a modified high degree of polymerization of PVC and thermoplastic elastomer sealing strip market share is very low.