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Introduction of fep tube and fep tube processing and forming process
- Categories:Industry news
- Author:FEP tube lady
- Origin:FEP tube lady
- Time of issue:2008-04-19 15:21
- Views:
Introduction of fep tube and fep tube processing and forming process
- Categories:Industry news
- Author:FEP tube lady
- Origin:FEP tube lady
- Time of issue:2008-04-19 15:21
- Views:
1. Introduction: The full name of FEP is Fluorinated ethylene propylene, which translates to fluorinated ethylene propylene copolymer (perfluoroethylene propylene copolymer). English trade name: Teflon* FEP, which is a class of chemical substances. FEP is a copolymer of tetrafluoroethylene and hexafluoropropylene. The melting point of FEP crystal is 304°C and the density is 2.15g/CC (grams/cubic centimeter).
FEP can be applied to soft plastics, and its tensile strength, wear resistance, and creep resistance are lower than many engineering plastics. It is chemically inert and has a low dielectric constant over a wide temperature and frequency range
Second, what is the fep tube?
Polyperfluoroethylene propylene (F46, FEP) heat shrinkable tube.
2.1 Performance, parameters
Volume resistance>1018ΩM, surface resistance>1013Ω, arc resistance>165 seconds, no leakage, low friction, dynamic friction coefficient 0.2-0.3, non-sticky, water, oil and water contact angle θ=114о, non-combustible air will not burn (oxygen index>95VOL% ), the shrinkage ratio is 1.7:1
2.2 Features
Temperature resistant, F46, FEP heat shrinkable tube: -200--200℃
Fusible polytetrafluoroethylene (PFA) heat shrinkable tube: -200--250℃
Corrosion resistance is only elemental fluorine at high temperatures, alkali metals play a role with it, and have no effect on all other concentrated and dilute inorganic organic acids, alkalis, and esters.
2.3 Application
Teflon FEP heat-shrinkable tube has outstanding wear resistance, chemical corrosion resistance and high temperature performance, especially suitable for high temperature performance occasions, used for insulation protection and pressure relief at connection welds and identification of coated components.
fep tube extrusion molding fep tube manufacturer
3. Fep tube extrusion molding
FEP processing and forming process: fep tube manufacturer: Teflon tube
FEP, like other fusible fluoroplastics, uses common methods for hot molding, die-casting and extrusion (vacuum and air pressure molding). In standard equipment, all molded parts in contact with molten fluoroplastics should be made of corrosion-resistant alloys. When processing fusible fluoroplastics, it should be heated to 400℃. In order to obtain the real melt and its homogenization, the plasticizing section should be specified in the processing unit. During FEP processing, highly toxic volatiles are released at high temperatures. Therefore, the exhaust fan should be activated during all high-temperature (>200℃) operations.
3.1. Molding (pressing) molding
To press a thin plate with a thickness of 1 to 2mm, you can use a flat die or a limiter of the required thickness, consisting of two (upper and lower) coated nickel or chromium metal plates. In order to prevent adhesion to the metal surface, the metal and polymer Add an aluminum foil liner with a thickness of 0.05 to 0.2 mm in between. Place the polymer-containing mold or restrictor on the flat plate of the press heated to 290～310℃, and keep it at this temperature for 25～30min, and then press it under a pressure of 20MPa and keep it at this pressure for about 2 min, then stop heating and cool to 240～250℃ under pressure (cold water can be used to cool the plate of the press), loosen the pressure, and remove the press mold or the restrictor with polymer and metal plate from the press. Cool to room temperature and open the mold.
3.2. Extrusion
The extrusion method can prepare films with a thickness of 0.01-0.2mm for wire and cable insulation, thin-walled tubes, plates, container products and fibers. In order to obtain a uniform melt and cause the large surface heat transfer of the extruder structure, the length-to-diameter ratio of the barrel should be 25-30:1, and the barrel should have three or four independent heating sections, and each heating section should Equipped with thermocouple and temperature regulator. The temperature in the barrel can be raised from 270-320°C to 370-400°C according to section, throughput, and material. It is best to use a metering screw with rapid compression (compression ratio of 3:1). Extrusion of film (tube type and flat seam type), wire insulation and fiber preparation all use melt stretching. At this time, the temperature of the melt and the amount of stretching (orientation) depend on the type of product. When preparing thin-walled products, the screw speed is ~10r/min, and the plate can reach ~70r/min.
3.3. Die casting molding
The die-casting method is processed at a temperature of 250～370℃ (according to? 43?Organo-FluorineIndustry 2009 Phase 3), the injection pressure is 50～150MPa and the injection rate is fine-tuned. The flow rate of the polymer melt must be stable. The mold should be preheated to 200-250°C, and the shrinkage of the polymer melt in the mold varies from 0.9% to 1.5% depending on the wall thickness and molding conditions. When the melt flows in a nozzle of any size, the shear rate is proportional to the movement rate of the polymer melt, and is also related to the movement rate of the piston. When the shear rate of the melt exceeds the critical value, the melt fractures, linting and delamination on the surface. In order to prevent the fracture of the melt, the flow rate of the melt should be reduced and a large-diameter nozzle should be used.
Four, FEP application areas:
1. The scope of application of FEP is the same as that of PTFE. It is used in electrical, radio, electronics, chemical industry, machinery manufacturing, refrigeration, medicine and other industrial sectors.
2. FEP is used as film printing board, wire and cable insulation, generator wire winding, electrical insulation parts (thin plates, rods, tubes, frames and insulators), corrosion-resistant structural products (oil-free lubrication mechanical parts), paint and varnished glass cloth . Excellent corrosion resistance makes it used in chemical work equipment, heat exchangers, fractionation towers, pumps, valves, tubes, seals, tube linings, laboratory transparent utensils, etc. FEP extruded thin-walled tubes are used in heat exchangers, and are suitable for heating and cooling highly corrosive liquids in the range of -200 to 200°C.
3. FEP parts used in the refrigeration industry can withstand the test of low temperature well. FEP sheets are used to prepare air pressure and vacuum (French) products.
4. FEP is used as wire and cable insulation for various purposes, and is especially suitable for wires and micro electronic components of electronic assembly circuits.
5. FEP film is used as a seal for capacitors, diaphragms, and chemical equipment, and is used to make printed boards and flexible cables in the printing industry.
6. The film can be welded, can be processed in vacuum, can be coated with metal, the surface does not need to be activated, and can be bonded with metal and glass cloth under heating and pressure.
7. FEP film has a particularly high gas permeability resistance, so it is used as a diaphragm separating the sensitive element of the gas analyzer from the analyzed gas.
My sister’s home with Teflon tube, Shenzhen DanKai Technology Co.,ltd., whose predecessor was Dongguan Dandi Insulation Material Co., Ltd. Fluoroplastic Material Factory, which was established in 1998, specializes in FEP, R&D, production and sales of PFA, PTFE and other fluoroplastic tube, rod, sheet and film products and other insulating materials. The company has a senior R&D team with international standards and a production line of fluorine plastic products imported from abroad. Some fluoroplastic products have passed ISO9001, SGS, FDA certification, and have been fully affirmed by domestic and foreign cooperative customers such as Huawei, Foxconn, Midea, ZTE, Intel, and AirTAC. The main products of the company are: ①Tubes: Ptfe tube, Fep tube, Pfa tube, Pvdf tube; ②Heat shrinkable tube: Ptfe heat shrinkable tube, Fep heat shrinkable tube, Pfa heat shrinkable tube, Pvdf heat shrinkable tube; ③Plate rod Membrane: Ptfe board and rod film, Fep board and rod film, Pfa board and rod film, Pvdf board and rod film; ④Insulation materials: silica gel, PE, PVC, UPE, etc.; ⑤Special category: PFA imported connector, spiral tube, spring tube , Rotary cut tube, welding rod, tee, straight-through, gasket, joint, taper rod, flared tube, sealing tube, braided tube, bellows, etc. At the same time, fluorine plastic products of various specifications can be customized and processed according to customer requirements.
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