Car sealing strip composition and application

There is a very important car body sealing member is made ​​of a synthetic rubber seal, also known as protective molding gibs . Mainly used in door frames, side windows , front and rear windshield , hood and trunk lid , make the seal , the other also played vibration protection.
Production of sealing material is mainly polyvinyl chloride (PVC), ethylene propylene rubber (EPDM), synthetic rubber-modified polypropylene (PP-EPDM) , etc., by extrusion molding or injection molding method is made.
Compartment door seal mainly refers to the door frame and the door seal head and said seal. Door seal by definition is mounted on the door frame seal. Door seal not only to ensure tightness , but also bear the impact force when closed , hence it must be flexible , but also toughness , mainly by the dense gel matrix and sponge rubber foam tube composed of two parts . Dense gel containing metal skeleton, serve to strengthen the stereotypical strip and fixation. Sponge rubber foam tube is soft and elastic , plays compression deformation, pressure relief bounce function. In addition, some seal lip portion constituted by the color or affixed with glue fabric , color and beautiful decorative effect.
Door head and said seal structure , there are two , one for the whole sponge rubber foam tube , and another by a dense rubber and sponge rubber matrix composition . This seal glue or embedded in the door, and the door seal with , in order to increase the door and the body of the seal. Door seal head and said not every car are used , such as some economy cars would not , mainly from cost savings considerations.
Bonnet sealing strip made ​​of pure foam sponge rubber sponge rubber foam tube or pipe and compacting plastic composite structure for the engine cover with the front section of the seal. Trunk lid or rear door seal by a dense skeleton containing gum base and sponge rubber foam tubes that can withstand a certain impact, ensure that the back cover is closed seal.
There are front and rear window seal of windshield seals, glass run channel and window seals inside and outside bar .
Front and rear windshield seal surrounded by the pure gum type of connection is made , it also has considerable flexibility hardness, in between the windshield and the body play mat care, fixation and seal. Glass run channel seal by a different hardness dense rubber composition with inlaid into the body to ensure the accuracy of dimensions , to cable seals against leakage , noise effect. The lip seal is also flocked surface is attached , when the glass moves up and down the glass can be reduced and the sliding friction between the strips , but also can reduce the noise. This form is also used for sealing sunroof seal. Inside and outside the window type of glue made ​​from the pure or pure plastic and plastic composite type of structure, it comes with flocking surface , in addition to reducing the friction with the glass , but also play a decorative role .
Since the doors , hood and more complex geometry of the window , in the corner where the shape is often compared to adopt special seal. Therefore, there are car seal inscribed angle connector type and a variable cross-section type and other special seal, conventional sealing strip with a special seal both ends connected by molding processing or single-ended and then meet at the corner parts of the overall seal and parts of the installation requires special shape .
Past security seals  produced using artificial compression molding , process simple backward , shape a single , mostly H-shaped . The seal is now under the control produced using extrusion molding machine or injection molding techniques , including the composite extrusion , variable diameter extrusion, microwave curing , the surface coating technology. For example , under the control of the computer , the variable diameter seal extrusion technology in the extrusion process can change the size and shape of the cross-section shape varied , go. Thus, the seal can be close to the body , good sealing effect .