China Scratch Mat

The opener, mixing box, carding machine and netting machine must be grounded as a whole to eliminate or reduce the static electricity generated during fiber transfer, carding and netting.As we all know, PTFE fiber has high static electricity, low crimp, smooth fiber, poor cohesion, and high density. The control of uniformity is a very important indicator in the production of needle punched filter felt.

Control of uniformity and surface density of needle-punched felt In the application of needle-punched filter felt, the uniformity directly affects its service life. Overcoming these difficulties involves the key technology for the production of 100% PTFE needle punched filter materials. It is very difficult to comb and lay such fiber. (2) Adjust the position of the inclined curtain of the carding machine and the conveying curtain of the web-laying machine, so that the wool net can be completely transferred, and reduce the problem of net breakage caused by the weight and small cohesive force of the PTFE fiber wool n

Adjust the speed of each transfer point to solve the problem of the fleece being pulled off due to the small cohesive force between the fibers and the excessively fast transfer speed. In order to ensure the smooth carding and transfer of PTFE fibers, and reduce the abnormal net leakage and net breakage, some parts of the equipment must be modified and adjusted to solve the problems of carding, netting, and netting.

Transform the distance between the reciprocating drive of the net-laying machine and the bottom curtain to be adjustable, so that the drop between the transfer points of the net-laying machine is adjustable, and control the different surface density of the wool net to be continuously and normally transferred, and solve the problem of The problem of network disconnection caused by self-heavy weight and small cohesive force between fibers during the laying process.

The modification and adjustment of the equipment are as follows:  Adjust the distance between the cylinder and the work roll, transfer roll, and doffer in the carding machine so that the fibers can be combed smoothly and reduce the effect of small PTFE fiber curl on the carding; The distance between the knife and the doffer allows the output fleece to be completely peeled from the doffer, ensuring that the carding machine can output the fleece continuously and evenly.

In order to ensure the uniformity of 100% PTFE needle punched filter felt, the following measures should be taken:. 1 Carding, web formation and web-laying According to the characteristics of PTFE fiber, it needs to be treated with antistatic, select a suitable antistatic agent, spray it evenly on the fiber, and then leave it to balance for a certain period of PTFE adhesive tape time

　　 Teflon PTFE: PTFE (polytetrafluoroethylene) non-stick coating can be used continuously at a high temperature of 260 ℃, the highest use temperature can reach 290-300 ℃, very low friction coefficient, good wear resistance and excellent chemistry stability.

Teflon spraying (paint), the English name is TEFLON, is a kind of fluorine coating with PTFE coated fiberglass tape polytetrafluoroethylene as the matrix resin, because of the pronunciation, it is usually called Teflon, Teflon, Teflon Dragon, Teflon, Teflon, etc. Its flexible applicability makes it widely used in: cookware, tableware, fuiture, molds, home appliances, automobiles, machinery, medicine, technology and so on.

Teflon (Teflon) coating is a special high-performance coating (paint) that combines heat resistance, chemical inertness, excellent insulation stability and low friction. It has comprehensive advantages that other coatings cannot compete.  Teflon is divided into four types: PTFE, FEP, PFA, and ETFE. (all are the transliterations of TEFLON)

Filled products containing glass fibers are suitable for sintering in nitrogen. . has developed rapidly in chemical anti-corrosion.. The sintering process of the filled product is the same as that of pure PTFE. Commonly used fillers according to these requirements are: glass fiber, carbon fiber, graphite, quartz sand, molybdenum disulfide, amorphous carbon, calcium fluoride, bronze powder, ceramics, polyimide, polyphenylene, polyparahydroxyformate, etc. Improve the pressure resistance, wear resistance, cold flow resistance, heat resistance, dimensional stability, etc.

Solvent mixing, the solvent is acetone or methanol, suitable for glass fiber filled PTFE. New application areas of PTFE. But for filled products containing MoS2, it is required to sinter in air at 360°C or in nitrogen at 380°C. Main applications It is used as oil-free lubrication bearings, bearing pads, piston rings, machine tool guides, etc. in the machinery industry. PTFE filled in foreign countries is generally completed by PTFE resin production plants, such as HosTaflonTF4000 series and HosTaflonTF3000 series of Hoechst in Germany And the HosTaflon2000 series.

In our country, because PTFE BBQ Mesh Mats PTFE resin production technology lags behind processing technology, PTFE filling technology is completed in product processing plants. of PTFE by adding different fillers such as inorganic, metal, and polymer to the PTFE resin. Compared with pure PTFE, the filled products have 5-10 times higher pressure resistance, 1000 times higher wear resistance, 80% lower linear expansion coefficient, 5 times higher thermal conductivity, and reduced volume resistance and surface resistance.

In recent years, the application of filled PTFE as the lining of pipes, valves, pumps, etc.Among polytetrafluoroethylene (PTFE) products, filled polytetrafluoroethylene (PTFE) products are the one with the largest output. There are currently three mixing methods used to fill PTFE: (1) The dry mixing process requires the mixing device to be fast, uniform and free of dead ends, and is suitable for products with general requirements.

The molding pressure of the filled PTFE product depends on the volume ratio of the filler in the PTFE, such as: 250 bar with 5% filler; 350 bar with 6%-10% filler; 500 bar with 12%-25% filler ; With more than 25% filler molding pressure 700 bar. Filled PTFE products generally adopt a compression molding process: the quality of filled PTFE products mainly depends on the choice of resin filler, the design of the formula, the uniformity of material mixing and other factors. (3) Wet mixing: The products formed by this process have high mechanical strength, low wear and good corrosion resistance

The reactivity of these compounds is very high. The principle is: Na transfers the outermost electrons to the empty orbital of naphthalene to form anionic radicals; then forms an ion pair with Na+, releasing a large amount of resonance energy, and forming a mixed solution of dark green metal organic compounds.064nm) is greater than that of hydrogen atoms (0.

The helical conformation just surrounds the PTFE's carbon chain skeleton, which is vulnerable to chemical attack, forming a tight and complete;fluorinated; protective layer, so that the PTFE main chain is not attacked by any exteal reagents, so that PTFE has other materials Unmatched solvent resistance, chemical stability, and low cohesive energy density; at the same time, the carbon-fluorine bond is extremely strong, with a bond energy of 460.05~1u0026mu;m, the surface tension of PTFE is 18. Because the radius of fluorine atoms (0. When in contact with PTFE, sodium can break the CF bond, tear off part of the fluorine atoms on the surface of PTFE, and leave a carbonized layer on the surface ,

Polar groups such as COOH; the depth of the carbonized layer is about 0. Structural analysis of PTFE properties: In PTFE, fluorine atoms replace hydrogen atoms in polyethylene. The unbranched symmetrical main chain structure of PTFE also makes it highly crystalline, so processing is more difficult.1.2 High temperature melting method The advantage of this method is that it has better weather resistance and heat resistance than other methods, and is suitable for long-term outdoor use; the disadvantage is that PTFE will release a toxic substance during high temperature sintering, and the shape of the PTFE membrane is not easy to maintain.

Reducing agent method (sodium-naphthalene solution replacement method) The sodium-naphthalene solution replacement method is the sodium-naphthalene solution replacement method that has better effect and wider application among the various modification methods currently known.2kJ/mol, which is much higher than the carbon-hydrogen bond (410 kJ/mol) and carbon- Gas Stove Top Protectors The carbon bond (372 kJ/mol) is high, which makes PTFE have better thermal stability and chemical inertness.

In addition to sodium-naphthalenetetrahydrofuran corrosive solution, treatment solutions such as sodium-biphenyldioxane and sodium-naphthalene glycol dimethyl ether also have good effects.5u0026times;10-3N/m, and the surface has high surface energy.028nm), the carbon-carbon chain is stretched from the plane of the polyethylene and twists and tus. 2.. Surface modification method of PTFE: 2.

Ductility; at the same time, PTFE has poor creep resistance and is prone to cold flow. In addition, the electronegativity of the fluorine atoms is extremely large, and the tetrafluoroethylene monomer has perfect symmetry, which makes the attraction and surface energy between PTFE molecules low, so that PTFE has a very low surface friction coefficient and good at low temperature. The conformation gradually twists to the helical conformation of PTFE