What is the function of the car door frame seal
There is a very important car door frame seal in the car body, which is a seal made of synthetic rubber, also known as a protective mold insert. It is mainly used on door frames, side windows, front and rear windshields, engine covers and trunk lids. It not only plays the role of sealing strips, but also plays the role of vibration reduction protection. Then, let's understand what the car door frame sealing strips are effect!
The car door frame seal mainly refers to the door frame seal and the door seal. Door frame sealing strip, as the name suggests, is a sealing strip embedded in the door frame. The door frame sealing strip must not only ensure airtightness, but also bear the impact force when the door is closed. Therefore, it must be both elastic and tough. It is mainly composed of dense rubber matrix and sponge rubber foam tube. The dense rubber contains a metal skeleton, which plays a role in strengthening the shape and fixing of the rubber strip. The sponge foam tube is soft and elastic, deformed under pressure, and rebounds after unloading. In addition, the lips of some sealing strips are made of colored glue or cloth, which is beautiful in color and decorative.
There are two structures of the automobile door frame sealing strip, one is all-sponge rubber foam tube, and the other is composed of dense rubber matrix and sponge rubber. This sealant is pasted or inlaid on the car door, and cooperates with the door frame sealing strip to increase the sealing effect between the car door and the body. Door seals are not used in every car, for example, some economical cars do not, this is mainly from the aspect of cost saving.
The engine cover sealing strip is composed of pure sponge rubber foam tube or sponge rubber foam tube and dense rubber, which is used to seal the engine cover and the front part of the vehicle body. The sealing strip of the trunk lid or the back door is composed of a dense rubber matrix with a skeleton and a sponge rubber foam tube, which can withstand a certain impact force and ensure the sealing of the back cover when it is closed.
Automobile door frame seal strips are mainly made of polyvinyl chloride (PVC), ethylene propylene rubber (EPDM), synthetic rubber modified polypropylene (PP-EPDM) and other materials, which are formed by extrusion molding or injection molding.
Automobile door frame seals are divided into front and rear windshield seals, window glass run groove seals and inner and outer window seals. The front and rear windshield sealing strips are surrounded by pure rubber strips, which have elasticity and considerable hardness, and play the role of buffering, fixing and sealing between the windshield and the body. The window glass run groove sealing strip is composed of sealant with different hardness, which is embedded in the car body to ensure the accuracy of size matching and achieve the functions of sealing, anti-leakage 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 rubber strip when the glass moves up and down, and can also reduce noise. This form of weatherstripping is also used for skylight weatherstripping. The inner and outer rubber strips of the car window are made of pure rubber strips or a composite of pure rubber strips and plastic parts. It has a flocked surface that both reduces friction with the glass and is decorative.
In the past, automotive door frame weatherstrips were produced by manual compression molding. The technology is simple and backward, and the shape is single, mostly H-shaped. At present, the production of automobile door frame sealing strip adopts computer-controlled extrusion molding or injection molding technology, including composite extrusion, variable diameter extrusion, microwave vulcanization, surface spraying and other technologies. For example, under the control of the computer, the variable-diameter extrusion technology can change the size and shape of the section during the extrusion process of the sealing strip, and complete various shapes at one time. In this way, the sealing strip can be closely attached to the vehicle body, and the sealing effect is good. Due to the complex geometric shapes of doors, covers and windows, special-shaped sealing strips are often used at the corners. Therefore, there are special sealing strips such as angle joint type and variable cross-section type for automobile sealing strips. Conventional sealing strips and special sealing strips are molded to be connected at both ends or single-ended, which can meet the requirements of integral sealing strips at corners and seams. Mounting requirements for special shape parts.