The uses and components of car weather strips

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The car body has a very important seal, which is a sealing strip made of synthetic rubber, also called a protective molding strip. It is mainly used in door frames, side windows, front and rear windshields, engine hoods and trunk lids, where it not only plays a sealing role, but also plays a role in vibration reduction and protection.

The sealing strip of the carriage door mainly refers to the sealing strip of the door frame and the door head sealing strip. Door frame sealing strip, as the name implies, is a sealing strip embedded in the door frame. The door frame sealing strip must not only ensure tightness, but also withstand the impact of closing the door. Therefore, it must be both elastic and tough. It is mainly composed of a dense rubber matrix and a sponge rubber bubble tube. The dense glue contains a metal skeleton, which strengthens the shape and fixation of the strip. The sponge rubber tube is soft and elastic, and has the function of deforming under pressure and rebounding after pressure relief. In addition, the lip portion of some sealing strips is made of colored glue or is covered with fabric, which has beautiful colors and decorative effects.

There are two structures of door sealing strips, one is a full sponge rubber bubble tube, and the other is composed of a dense rubber matrix and sponge rubber. This kind of sealant is pasted or embedded on the car door and cooperates with the door frame sealing strip to increase the sealing effect between the door and the car body. Door seals are not used in every car. For example, some economy cars do not have them. This is mainly due to cost savings.

The sealing strip of the engine cover is composed of pure sponge rubber tube or sponge rubber bubble tube and dense glue, and is used to seal the engine cover with the front of the car body. The sealing strip of the trunk lid or back door is composed of a dense rubber matrix with a skeleton and a sponge rubber tube, which can withstand a certain impact force and ensure the sealing when the back cover is closed.

The sealing strips are mainly made of polyvinyl chloride (PVC), ethylene propylene rubber (EPDM), synthetic rubber modified polypropylene (PP-EPDM), etc., and are made by extrusion molding or injection molding.

Car window seals include front and rear windshield seals, window glass guide groove seals and inner and outer window strips. The front and rear windshield sealing strips are made of pure rubber strips. They are elastic and fairly hard, and play a role in cushioning, fixing and sealing between the windshield and the car body. The window glass guide groove sealing strip is composed of dense glue with different hardnesses and is embedded into the car body to ensure consistent size matching and achieve the functions of sealing, leakage prevention and sound insulation. The lip of the sealing strip is also pasted with a flocking surface, which can reduce the sliding friction between the glass and the strip when the glass moves up and down, and can also reduce noise. This form of sealing is also used for sunroof sealing. The inner and outer strips of the window are composed of pure rubber strips or pure rubber strips with plastic parts. It has a flocked surface, which not only reduces friction with the glass, but also plays a decorative role.

In the past, sealing strips were produced using manual molding, with crude and backward technology and a single shape, mostly H-shaped. Current sealing strip production uses extrusion molding or injection molding technology under computer control, including composite extrusion, variable diameter extrusion, microwave vulcanization, surface spraying and other technologies. For example, under computer control, variable-caliber extrusion technology can change the size and shape of the cross-section during the sealing strip extrusion process, with various shapes and in one go. In this way, the sealing strip can be close to the car body and the sealing effect is good.

Due to the complex geometric shapes of car doors, hoods and windows, sealing strips with special shapes are often used at corners. Therefore, automobile sealing strips also have special sealing strips such as corner joint type and variable cross-section type. Conventional sealing strips and special sealing strips are connected at both ends or single-end connected through molding processing, which can meet the requirements of the overall sealing strip at the corner and Installation needs for special shaped parts.