As an important indicator for measuring the quality of automobiles, automotive sealing strips play a very important role in automobiles. The sealing strip has an indispensable function in cars, as it has the function of filling gaps between body components and shock absorption. It not only needs to prevent the invasion of external dust, moisture, and smoke, but also needs to isolate the invasion or leakage of noise. The surface treatment of sealing strip flocking and spray painting can greatly improve the firmness of flocking and spray painting through plasma cleaning technology, completely replacing the primer process.

So what changes will occur to the sealing strip through the treatment of the plasma cleaning machine?

The sealing strip is produced and processed by extrusion molding method, and the previous manufacturing method is relatively simple. It can be produced and processed based on a simple mold. With the increasing standards for sealing of motor vehicles, the standards for sealing strips are also becoming higher. New technologies and materials are constantly emerging, resulting in increasingly complex production processes. For example, in recent years, with the continuous progress and improvement of thermoplastic elastomer technology, new types of thermoplastic elastomers such as TPO and TPV have become increasingly common in automotive sealing strips

This type of material has both the excellent properties of elastomers and the excellent properties of plastics, making it convenient for production and processing, as well as recyclable for reuse. This type of material is gradually replacing EPDM products. The common door sealing strip is composed of a co extruded solid carrier and a sponge rubber tube sealing strip, and the sponge part provides sealing function after being compressed by the body door frame. But when the speed of the car is very high, the external gas pressure will greatly exceed the sealing ability provided by the sponge, and thus the effect of sealing ability is not significant.

Usually, due to the very low surface tension of this type of automotive sealing rubber strip material, when using flannel, flocking, PU coating, or organic silicon coating technology, the material of this type of coating technology is difficult to adhere. In the past, manual segmented polishing technology has been commonly used to improve the roughness of the rubber strip and apply the primer. The polishing production process is time-consuming and laborious, with low production capacity, which cannot assist the extrusion equipment in online processing and is very prone to secondary pollution, The cost is relatively high, and the yield rate is low. However, with the continuous improvement of product standards. Polishing technology has long been unable to meet the ministerial and European standards of automotive manufacturing.

Surface treatment of various automotive sealing strips is carried out using the low-temperature plasma of a plasma cleaning machine. By measuring the surface energy, it can reach a maximum of 60dvnes/cm, and can remove the polishing or polyester coating process without the need for undercoating. Online processing can be achieved according to the speed of the extrusion or flocking machine, increasing production capacity, reducing costs, and not damaging the surface of the strip. It also meets the environmental standards of applying water-soluble adhesive. At present, atmospheric jet low-temperature plasma cleaning machines have long been used in the processing of products such as car door frame sealing strips, door header, window guide grooves, window side strips, front and rear windshields, and front and rear cover sealing strips.

Classification of automotive sealing strips:

1. Sealing strips are classified by installation position: mainly including front and rear windshield sealing strips, door frame sealing strips, side window sealing strips, sunroof sealing strips, engine compartment cover sealing strips, luggage compartment sealing strips, etc. Among them, the door frame sealing strip is the most in contact with the car owner, and it may come into contact with both getting on and off the vehicle.

2. Sealing strips are classified by cross-sectional shape: they can be divided into solid shapes (circular, square, flat, and polygonal), hollow shapes, and metal rubber composite shapes. The installation position of the sealing strip is closely related to the cross-sectional shape, with different and complex shapes. For rubber sealing strips, the design of cross-sectional shape is very important as it relates to sealing, buffering, installation, and the use of parts.

For example, the sealing lips on both sides of the door and window sealing strip should be in contact with both sides of the window glass with appropriate force of the same size. The length and thickness of the adhesive strip lip should be appropriate. If it is too thick or too long, it will cause excessive resistance of the glass and make it difficult to lift or lower; Being too thin or too short can lead to poor glass sealing, vibration, and rain leakage; The shape and size design of the bottom section of the sealing strip should match the shape of the window steel groove, and the combination of the two should make the elastic adhesion of the sealing strip itself to the window steel groove to prevent it from falling off.

The above classification of automotive sealing strips can be processed using plasma cleaning technology to improve surface adhesion and enhance packaging quality.