Isostatic Pressing Molding of PTFE
Polytetrafluoroethylene (PTFE) isobaric forming process is also known as hydraulic forming, used to manufacture the larger volume of PTFE sleeve, storage tank, hemisphere shell, large round plate, tower column, round tube and for cutting large sheet of large blank, square billet, etc., can also manufacture the whole lining PTFE composite structure of the three-way elbow, guide tube and other complex shape products. PTFE isoppress molding has the characteristics of simple equipment, fast production, simple mold structure and convenient operation, uniform product pressure, good quality, saving resin and so on.
1.The application of corrosion resistance. Due to the defects in corrosion resistance of rubber, glass, metal alloys and other materials, it is difficult to meet the harsh conditions of temperature, pressure and chemical media coexistence environment, resulting in considerable losses. PTFE material has become the main corrosion resistant material in petroleum, chemical, textile and other industries because of its excellent corrosion resistance. Its specific applications include: conveying corrosive gas conveying pipe, exhaust pipe, steam pipe, rolling machine high pressure oil pipe, aircraft hydraulic system and cold pressure system of high and low pressure pipe, distillation tower, heat exchanger, tank, tank lining, valves and other chemical equipment. The performance of sealing parts has a great impact on the efficiency and performance of the whole machine. PTFE material has corrosion resistance, aging resistance, low friction coefficient and non-viscosity, a wide range of temperature resistance, good elasticity characteristics make it very suitable for the manufacture of high corrosion resistance requirements, the use of temperature above 100℃ seals. Such as machines, heat exchangers, high pressure containers, large diameter containers, valves, pump groove flange seals, glass reaction pot, plane flange, large diameter flange seals, shaft, piston rod, valve rod, worm gear pump, pull rod seals and so on.
2. Low friction performance in load application. Due to the friction part of some equipment should not be oil lubrication, such as in the lubricating oil will be dissolved in solvent and failure occasions or papermaking, pharmaceutical, food, textile and other industrial products need to avoid lubricating oil contamination, which makes the filled PTFE material into mechanical equipment parts oil-free lubrication (direct load) of the most ideal material. This is because the material has the lowest friction coefficient of any known solid material. Its specific uses include for chemical equipment, paper machinery, agricultural machinery bearings, used as piston rings, machine tool guide rail, guide ring; In civil engineering is widely used as bridge, tunnel, steel structure roof truss, large chemical pipeline, storage tank support slider, as well as used as bridge support and bridge rotation.
The suspension grade PTFE resin in the highest pressure of 35MPa isostatic molding, isostatic technology is the use of PASCAL principle, sealed in the flexible mold is pressed PTFE resin or has a closed shell added PTFE resin solid workpiece placed in a high pressure cylinder full of fluid pressure medium, The high-pressure equipment is used to exert a certain pressure on the pressure medium in the cylinder, and the pressure is equally transferred to the interface of the flexible die or workpiece through the pressure medium, so that the pressed material or workpiece has a certain volume deformation under the action of the constant static pressure, so as to achieve the constant static pressure pressing. If the pressed material is a powdery material, the powder in the envelope will be uniformly compressed and densified when pressure is applied equally to the surface of the flexible die, and its shape is smaller than and similar to the cavity of the flexible die.
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