The main process of rubber seal strip includes three parts: rubber refining, extrusion vulcanization and post-processing.
1, in the rubber refining process, through the computer strict control of various raw material formula and temperature, pressure, time and other processing conditions.Prepare granular or banded blends.PVC and TPE sealing strip can be directly selected for the appropriate particle material directly for extrusion processing.
2, the rubber seal strip in the actual production, generally put the extrusion and vulcanization process together.In the process of extrusion sulfide, all kinds of granulated or ribbon mixing rubber and skeleton materials together by extruder die compound extrusion, and the high temperature vulcanization, in this process, mouth mold design and manufacturing and sulfide, conditions for the product performance and quality plays a key role, if the mouth not ignored cause sealing strip in the extrusion die design
The fluctuation of pressure and section and the dead Angle of the flow passage will lead to the defects such as the scorch of the rubber and the poor bonding of the materials through different flow passage.Using computer software to simulate flow state and digital die technology can improve die quality and shorten die design and manufacturing cycle.Both oversulfur and undersulfur will have an adverse effect on product quality.In terms of vulcanization process, salt bath vulcanization is rarely used because it is easy to produce environmental pollution.
Most factories use microwave and hot air combined heating, through computer control of the temperature, speed, pressure at each point of the production line, can ensure the ideal vulcanization conditions and extrusion quality.According to the different parts of sealing strip installation, some sealing strips need to be flocking on the surface, spraying and in the sealing strip clamping parts add adhesive, these processes can be completed online through special devices.
PVC and TPE seal strips do not need to be vulcanized, and other processes are similar to the extrusion of rubber seal strips.
3. The post-processing process can be divided into three main processes: cutting, molding (joint, joint Angle) and post-processing.In the cutting process, the sealing strip needs to be processed to the required shape and size. In order to ensure its good machining accuracy and interchangeability, the use of multi-station joint processing equipment can achieve relatively satisfactory results.In the molding process.To ensure accurate shape, injection vulcanization molding is usually used
Method.In recent years, more and more whole cars adopt combined-type sealing strip, and compound several sections of sealing strip together.The post-processing process is developing in the direction of combination and modularization.
The post-processing process includes linings and spraying, the installation of fixed sealing strip pins and double-sided tape and fine trimming of the edge work, for some high-end cars, in the post-processing implanted sensor, when the stress reaches a certain value to send a signal, can control the work of the car window elevator motor, and has the function of preventing clamping injury.For mass production of products, the application of assembly line and robot in post-processing process is the development trend.