Starting from ensuring product quality, coordinate the pressing speed, drying time, sintering temperature and time, so that the pressing, drying, and sintering processes can be coordinated. At a certain cooling rate, the larger the relative molecular weight, the smaller the crystallinity; the smaller the relative molecular weight, the greater the crystallinity. The degree of crystallinity is related to the cooling rate and relative molecular weight after sintering. (2) PTFE is a crystalline polymer.

After drying at 360℃ (1) PTFE has a very high viscosity in the molten state, and will not change from a highly elastic state to a viscous fluid state when heated to 415°C; the melt viscosity decreases with the increase of shear stress, showing the characteristics of a non-Newtonian fluid. Fast cooling rate, low crystallinity, slow cooling rate, high crystallinity. Therefore, to obtain good PTFE products, the sintering process must be strictly controlled. The entire operation process is as follows: first select the mold, install the mold, and carefully correct the center position of the mold installation.

Do not push and push in an environment where the room temperature is lower than 20℃. According to the requirements of the product, choose the material cavity and mold and install it, and strive to make the three plates parallel to the mandrel fixing plate, piston fixing plate and material cavity fixing plate, while the mandrel is perpendicular to the three plates, so as to ensure the uniformity of pipe wall thickness., the proportion of resin weight is 1/5) to make a paste.Teflon push molding production process Push molding is the most important part of the whole process. At C, the crystallization area disappears completely; when the temperature is lower than this temperature, it recrystallizes.

In order to obtain good products, it is necessary to achieve uniform fiberization, and the pushing temperature factors must be controlled, namely, the temperature of the material cavity is 30～35℃, and the temperature of the die is 50～60℃. The main factors that directly affect the crystallinity of the product are the sintering temperature and time during molding. I～20M/min, the compression ratio is 500～1000, and the die angle is 20～60.

Press it into a thick-walled cylindrical blank, put it into the barrel of the press, heat it, and press it with a plunger to form it. After trimming the blank, add it to the barrel of the pusher, lower the plunger, and start the push molding according to the established process conditions. These conditions are all necessary conditions to ensure product quality. , The aspect ratio of the die is 8-10, and the inner surface of the die must be smooth and clean.

When the temperature exceeds 327. The push tube and other products are subjected to the next connection process, namely drying, sintering zone length, and product specifications. Usually the pushing speed is 0. The 20-30 mesh sieved dispersing resin is mixed with organic additives (toluene, petroleum Gas Stove Top Protectors ether, solvent oil, etc. Pressing is also called paste extrusion molding. When designing process conditions, we must make overall considerations.