Security seals functional requirements

Seal used to keep the body door, windows and other moving parts, and front and rear window, triangular windows, which are not part of the dynamicaccory plastic padlock security seals, seal shape and cross-section should be used to meet the requirements of different parts and different functions. 

Seal used to keep the body door, windows and other moving parts, and front and rear window, triangular windows, which are not part of the dynamic high security bolt seals, seal shape and cross-section should be used to meet the requirements of different parts and different functions. 

The purpose of the sealing strip: 

① keep the car to avoid the rain, dust, heat and sound insulation; 

② When the body is subjected to vibration and distortion, the pull tight security seals also cushion, shock absorption, keeping the role of glass; 

③ on the edge of the transfer windows for decoration; 

Sealing material, natural rubber is often used early and later development as ethylene, propylene rubber, nitrile rubber, synthetic rubber as the main, there are polyvinyl chloride resin. For fixed window edge portion of the front, rear, triangular windows, etc., there is also a variety of bonding forms (such as direct bonding method or rubber band bonding method). 

As the synthetic rubber foam should have a good performance, which requires: 

Excellent weather resistance; 

For coating with a non-polluting; 

Residual deformation; 

Low water absorption; 

At low temperatures can be maintained good flexibility; 

Heat resistance; 

Good wear resistance. 

Door seal with the body is a more difficult position, sealing requirements are relatively strict, should be pull tight plastic seals part of a long, cross-sectional shape of the different parts of the seal, and the doors open and close frequently. 

Door seals to achieve the basic shape has three sections: the curved type, compression type, complex. The different parts of the seal practical shape is much more complex. 

The arrangement of the door seals are: door-mounted (fixed seal around the door), body-mounted (seal fixed on the frame around the doorway), doors, body double mount (around doors and openings around seals are installed on both sides). 

Obviously, doors, body double stainless steel cable ties improves the vehicle installation tightness. Can use different parts, made of a variety of complex cross-sectional shape. To enhance the sealing effect. On limousine often set three, four seals, pillars and roof side before installing parts quadruple sealed beam structure. This multi-channel stainless steel cable tie crevices are generally arranged in the front door, in addition to having a sealing function, as well as automotive noise reduction effect. 

Some cars doorway stainless steel wire ties is made of foam rubber and metal frame with clamping surface portion of the plastic extrusion while. The foam part is used EPDM (EPDM), a density of 0.6 ± 0.18/cm3, i.e., the sheath gripping assembly portion of the surface of PVC is used, hardness of 65 ± 5HS; metallic material used in the skeleton low carbon cold rolled steel sheet, the surface requires bright; clamping portion of the surface with a pattern, the pattern of shapes and colors and interior colors and patterns to match, played a role in beautifying the interior. 

Chlorinated polyethylene (PEC) section of the above three properties with rubber materials are, in contact with the glass surface with a flocking, the extrusion section. self-locking cable ties requires no less than the entire 48h, higher than 60 ℃, the installed state (stuffed) allowed the aging pattern, it should be able to withstand continuous partial flocking alternating load wear test, and require nitrogen Test 1 000 hours of light allowed to discoloration due to higher product quality requirements, process more complicated, more difficult, there are some difficulties in the current domestic production.