Analysis on the Development Status of Plastic Door and Window Sealing Materials in China

Material condition of plastic door and window sealing strip

At present, the sealant strip materials used in foreign countries mainly include nitrile rubber, EPDM, thermoplastic elastomer (TPE), polyurethane elastomer (P), silicone rubber, etc., and have excellent aging resistance. The use rate of EPDM rubber is higher, reaching more than 60%.

Analysis on the development status of plastic door and window sealing materials in China

In recent years, in the market of domestic door and window sealing materials, the market share of plasticized polyvinyl chloride sealing strips has reached more than 90%, and the modified high-polymerization degree polyvinyl chloride and thermoplastic elastomer sealing strip market recommended by relevant industry departments. The occupancy rate is extremely low, and most of them are concentrated in the surrounding areas of Beijing. EPDM rubber was developed by Beijing Institute of Chemical Industry in the 1960s, but its application and development on doors and windows was only put on the agenda in the mid-1990s, and in 2000 by the Capital Aerospace Machinery Company rubber plastics. The product factory was developed and developed. In the latter part of the same year, it passed the acceptance of relevant experts from the Ministry of Construction. It is currently in the stage of mass production, but it is only used by some domestic high-end door and window manufacturers. Compared with similar foreign products, the domestic EPDM rubber sealing strips are about 40% lower than the similar products in foreign countries, but they are still developing slowly. The reason is that the users have not realized that the sealing strips account for a small proportion of the total cost of manufacturing the doors and windows. Only considering cost savings, did not consider the comprehensive benefits of using high-quality high-quality sealing materials.

Sealing strip section design and mold making process

Due to the late development of the domestic plastic door and window sealing strip, the initial cross-sectional shape is relatively simple. It is limited to the "K" strip used for the glass bead seal, the large spoon used for the window frame (fan) seal, and the small "0" used by the yarn fan. "Articles, the variety is relatively simple. On the contrary, foreign sealing strips have been developed with plastic doors and windows, and their production has reached serialization and scale. The design of each product section conforms to the requirements of relevant functional functions, and the cooperation with the corresponding profiles is almost perfect. With the introduction of foreign door and window manufacturing technology, the cross-sectional shape and variety of domestic sealing strips have also undergone great changes, but due to the backwardness of domestic mold making processes and the domestic counterparts as sealing materials for one of the door and window accessories. The degree of attention is not enough, and finally the manufactured products are close to the shape of the design in terms of shape, and there are still some defects in the function of use. For example, the gap between the fitting parts is large, the pressing amount of the finished product and the amount of overlap are not up to the relevant requirements. As a result, some quality problems will inevitably occur during use.