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Analysis of the status quo of automobile sealing strip industry

by:ORK      2022-11-02
The production and processing technology of automobile sealing strip products is mainly divided into two categories: one is rubber seals-based sealing strip products. The processing technology of such products includes rubber mixing process (two-stage rubber mixing), multi-material composite extrusion Production process (hard glue, soft glue, color glue, sponge glue, metal frame, reinforcement wire, etc.), heating vulcanization process (microwave vulcanization, hot air vulcanization, glass bead fluidized bed vulcanization, salt bath vulcanization, vulcanization tank vulcanization, etc.) , Post-processing technology (cutting, vulcanization joint, electrostatic flocking, surface spraying, bonding, etc.); Second, the sealing strip products are made of plastic and thermoplastic elastomer (TPE) as raw materials. Such products do not require heating and vulcanization. After extrusion, it only needs to be cooled and formed, the production line is relatively short, and the equipment is relatively simple. In terms of the composite extrusion process of automobile weather strips, the degree of automation is relatively high, and the domestic technology is relatively mature. There are many companies that can design, process and debug the extrusion production line according to the needs of automobile weather strip enterprises. Compared with foreign extrusion production lines, the price of domestic production lines is low, only about 1/3 of imported production lines, and the equipment capacity index is relatively low. One of the most important parameters of the composite extrusion process of automobile weather strips is the extrusion speed during normal production. The factors that determine the quality of the process parameters, in addition to the capacity of the complete production line equipment, the material, structure, and formula design suitable for high-speed extrusion will play a great decisive role. At present, this parameter is generally divided into three grades: less than 10M/min, 10M—20M/min, more than 20M/min. Most of the domestic automotive sealing strip companies are within 10M/min, a few joint ventures and Chinese-funded enterprises reach 10M-20M/min, while foreign automotive sealing strip companies are basically above 20M/min. In terms of post-processing technology after extrusion of automobile weather strips, due to the low labor cost in China and the generally low degree of automation, it is a labor-intensive process. However, with the continuous development of the national economy, the domestic labor cost will gradually increase, and various automobile sealing strip enterprises will gradually introduce and develop post-processing production equipment with a high degree of automation. In addition, in the post-processing technology of automobile weather strips, with the development of science and technology, a number of new processes and equipment have emerged, such as the emergence of rotary electrostatic flocking equipment, which solves the problem of multi-directional flocking of automobile weather strips; The automatic nylon fastener assembly machine replaces the traditional way of manually assembling fasteners, which can not only improve production efficiency, reduce the number of workers, but also avoid the occurrence of quality problems such as missing and wrong installation of fasteners; variable-section composite extrusion technology is extremely Greatly improve the installability, sealing, decoration and other functions of automotive weather strip products; various film tapes (flocking tapes, PE wear-resistant tapes, TPV color decorative tapes, etc.) The original production process is improved, the production cost is reduced, and the industrial chain of the automotive sealing strip industry is also extended. At present, the main material of automobile sealing strip generally adopts EPDM or polyvinyl chloride plastic (PVC). Ethylene-propylene-diene rubber seals (EPDM) is an elastomer material polymerized from ethylene and propylene monomers with a small amount of non-conjugated diene. The unsaturated double bond is introduced on the upper part, so it has excellent weather resistance, heat resistance, ozone resistance, ultraviolet resistance, good processing performance and low compression set. It is the first choice for the production of automotive sealing strips. The service life of automobile sealing strip produced with EPDM material can reach more than ten years. PVC materials are mostly used in automotive weather strips with higher surface decoration requirements, such as roof trim strips, inner and outer sealing strips of windows. With the development of the automobile industry, more and more new materials can be used for the processing and production of automobile weather strips. Among them, thermoplastic elastomer (TPE) material is the most prominent new type of environmental protection material, which is mainly divided into polyolefin (TPV, TPO); polyurethane (TPU); polyester (TPEE): polyvinyl chloride (TPVC) ); polyamides (TPAE) and other types of thermoplastic elastomers. Polyolefin (TPV, TPO) thermoplastic elastomer materials are mainly used in automotive sealing products. These materials have a small friction coefficient with glass and good wear resistance. They can be used as automotive glass guide grooves and door glass. Materials for strips and some auxiliary sealing strips. In addition, more and more attention is paid to environmental protection requirements in the auxiliary materials of various automotive weather strips, such as the application of various environmentally friendly adhesives and water-based coating materials. Company website: https://www.orksealing.com/
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