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Classification for rubber sealing strip

Classification for rubber sealing strip

Seals can be based on profile, method of curing, use location and purpose, material classified in several ways.

, Car door rubber seal by profile category.
Can be divided into solid products (round, square, flat shape), hollow products and metal-rubber composite products and so on. Among them, more than 60% of metal-rubber composite sealing strip. Section design for the rubber seal is essential. First is the sealing lip shape, size, design, sealing lips should be the same on both sides, suitably sized force from the Windows contacts on both sides of the glass. Lip side length, and thick should appropriate, had thick, and had long will makes glass lifting resistance partial big, had thin, and had short and will led to glass have not to good of guide and sealed, produced vibration, and noise, and leak rain phenomenon; second is section bottom shape, and size design, Windows steel slot section Shang has raised, its role is to Assembly guide slot, so, guide slot section bottom should design out corresponding structure, both easily loaded into, and can using sealed article itself of elastic attached in steel guide slot within, prevent its prolapse; last is outside take side of shape, and size, In order to improve the appearance of Groove exterior body and should fit tightly.

Bis, sealed by vulcanization method can be divided into:

(1) non-continuous curing method (extrusion tape by a length after cutting, put in autoclave, extrusion molding of rubber semi-finished products into the sulfide in the model);

(2) continuous curing method (microwave continuous curing method, salt baths for continuous vulcanization, hot-air continuous curing method and other methods). A. microwave continuous curing composite seal: microwave curing technology is applied after the energy crisis in the 1970 of the 20th century abroad and been widely promoted production technology. Adoption of technology of microwave continuous curing production consists of a metal core and solid core rubber and sponge materials composite rubber Strip, and, in terms of energy and improve efficiency, device is superior than the other continuous curing method. This technology has been recognized around the world for the production of extruded products the best method. Characteristics of microwave heating is the heat generated in the object to be heated, rather like a regular from external input, not only heating and distribution, improve product quality and greatly shorten the time taken to heat. B. continuous Vulcanized seal salt bath: salt bath containing sulfide nitrite salt bath systems, environmental pollution is large, has gradually been phased out. C. hot air curing sealing strip: hot air curing has developed into the strong wind-type sulfide, which uses high temperature, high speed and hot air vulcanization (Tmax:450 ° c, and Vmax:60m/s) can be achieved using the flame effect of pretreatment, while security is greatly improved.

Four, according to the rubber seal material categories:

Automotive sealing rubber materials having dense rubber, hard rubber and sponge three. Hard rubber hardness up to Shaw of the A95. Sealing compound widely used anti-aging, low temperature resistance, moisture resistance, chemical resistance, especially ozone aging resistance of ethylene-propylene-diene rubber (EPDM). EPDM can be used with steel, steel wire braid, TPE, flannel, flocking, PU coating, silicone coating compound, car interior and the outside world and their own waterproof, dust, noise, heat, vibration, wear and decorative role. EPDM sealing strip can be stable under normal circumstances for more than 10 years. Can also choose has good ozone resistance and good aging resistance in Chloroprene rubber (CR). Taking into account the technological properties of commonly used compound, sometimes used with rubber, natural rubber (NR) and CR, and styrene-butadiene rubber (SBR) three kinds of rubber or polyethylene (PE), EPDM, NR-rubber and to improve ozone resistance.

In recent years, with Thermoplastic Elastomer (TPE) technology continues to grow and mature, and applications continue to grow. The raw materials in the manufacture of seals, EPDM the main raw materials used in the past are constantly updated and developed. Has excellent physical properties and good machining property of long chain branching in new EPDM can be controlled so that it better curing performance, and can increase the extrusion speed and product yields. New thermoplastic elastomers such as TPO and TPV materials applied in automotive sealing strip is also increasing. Works fine properties of these materials are elastic, but also has excellent characteristics of plastic, easy processing, and recycling reuse, which is gradually replacing the EPDM products.