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The basic knowledge of the production process of the sealing strip

Number of clicks:9652018-06-21 17:07:46 Source: Hebei Shen Lian sealing parts Co., Ltd.|Silicone rubber seal|Three EPR seal|Sealing strip for building|Automobile seal

The commonly used sealing strip is made of rubber. This paper mainly introduces the production process of rubber sealing strip. The main process of rubber seals includes three parts: rubber mixing, extrusion vulcanization and post processing. In the process of rubber making, the processing conditions of various ingredients, temperature, pressure and time are strictly controlled through computers. Preparation of granular or banded mixture. For PVC and TPE seals, suitable particle materials can be directly selected for extrusion processing.
Rubber seals are generally combined with extrusion and vulcanization processes in actual production. In the process of extrusion vulcanization, various granular or banded mixtures and skeleton materials are co extruded by the die of extruder and vulcanized by high temperature. In this process, the design and manufacture of the die and the conditions and conditions of vulcanization play a key role in the performance and quality of the products. If the design of the die is unreasonable, the seal is caused by the seal. When the pressure and cross section fluctuate during extrusion, the dead angle of the flow channel will cause the coke burning and the defects of bad combination through different flow channels. The computer software is used to simulate the flow state and digital die technology, which can improve the die quality and shorten the period of the design and manufacture of the die. Sulfur and sulfur deficiency will have adverse effects on the quality of products. In the vulcanization process, the salt bath vulcanization is rarely used for environmental pollution. Most of the factories now use microwave and hot air combined heating. Through computer control the temperature, speed and pressure of each point of the production line, the ideal vulcanization strip and extrusion quality can be guaranteed. According to the different installation parts of the seal, some seals need to be flocking, spraying and adding non dry glue on the surface of the seal. These procedures can be done online through special devices.
For PVC and TPE seals, the process needs no vulcanization, and other processes are similar to the extrusion of rubber seals. Post processing can be divided into three main processes: cutting, molding, joint and post processing. In the cutting process, the sealing strip needs to be processed to the desired shape and size. In order to ensure its good machining accuracy and interchangeability, the use of multi position joint processing equipment can achieve satisfactory results. In the molding process. In order to ensure precise shape, injection vulcanization is usually used. In recent years, more and more cars have adopted a combined seal strip to compound several sections of the sealing strips. After the post processing process is developing in the direction of combination and modularization, the post processing procedures include off line flocking and spraying, the pin of the fixed sealing strip, the double side tape and the finishing work. For some high-grade cars, the sensor is implanted in the post processing. When the stress reaches a fixed value, the signal can be sent to control the car window. The work of reducing motor has the function of preventing clamping. For large quantities of products, the application of pipelining production lines and robots in post processing processes is a trend of development.
In order to maintain the image of plastic doors and windows, care for the healthy and healthy growth of this new industry, the seal manufacturer should produce the really qualified seal, and the plastic door and window assembly plant should choose the truly qualified, high quality seal. Ensure the quality of plastic doors and windows.
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