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Some Key Factors to be Considered When PTFE Is Processed

Views: 100     Author: Site Editor     Publish Time: 2021-09-11      Origin: Site

Polytetrafluoroethylene, referred to as PTFE or F4, is a polymer of tetrafluoroethylene with excellent comprehensive properties. It is corrosion-resistant, high temperature resistant, non-stick, self-lubricating, with excellent dielectric properties and low friction coefficient, so it can be made into finished products for application. PTFE products include ePTFE tape, PTFE cable tape, PTFE thread sealing tape, etc.


In addition, common PTFE products also include PTFE rod, PTFE plate, PTFE gasket and PTFE tube. But no matter what kind of PTFE products, all need to be processed. So, what are the key points of machining of PTFE products? What should be paid attention to?



1. There Are Requirements for Knife Tools

When polytetrafluoroethylene products are machined, the utilization of machinery and equipment should be focused on and the tool edge should be very sharp. When polytetrafluoroethylene products are machined, cemented carbide tools can not be applied. After all, the cutting edge of cemented carbide tools can not be ground sharply. If it is in mandatory use, it will affect the dimensional accuracy and surface quality of PTFE products.


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2. Coolant Should Not Be Added 

When polytetrafluoroethylene products are machined, coolant can not be added. This is because the PTFE skived sheet is molded with PTFE resin and then converted into products after sintering, while the PTFE molding plate is formed at room temperature and then cooled by sintering. If the cooling fluid is added in the machining of PTFE products, it is easy to affect the quality of PTFE products. If it is applied to the use occasions again, it will not be long before the pipeline leakage occurs.



3. Pay Attention to Mechanical Speed Problem

When polytetrafluoroethylene products are machined, the rotation speed of the machine should be cared. After all, if the rotation speed is too high, it is easy to cause the material to adhere to the inner wall of the cylinder. Therefore, when PTFE products are machined, the rotation speed of the mixture should be moderate and the standard should be uniform mixing. Moreover, in order to make the extrusion aid more fully disperse on the surface of powder particles, the mixture must be sealed at room temperature (23℃ or slightly higher) for 5-15 hours. PTFE products include color PTFE tape, PTFE thread tape, gas seal tape, etc.



4. Pay Attention to Benchmarking

When polytetrafluoroethylene products are machined, take care of the determination of benchmark.

(1) Correctly Select the Positioning Datum of Parts in Machining

Only to meet the specific requirements of reliable positioning and high precision, convenient positioning, convenient processing, convenient clamping and simple fixture structure, the machining allowance of parts can be ensured.


(2) Rough Datum Is Selected and Determined according to the Selection Principle of Rough Datum

When parts have different machined surfaces, these non machined surfaces should be applied as rough datum. If the part has several non machined surfaces, the non machined surface with higher position accuracy relative to the machined surface should be taken as the rough datum. Moreover, the surface used as the rough datum should be flat and free from flash, burr or other surface defects.


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5. Care for the Processing Environment and Temperature, As Well As Some Operating Standards of Operators

Grasp the changes of environment and temperature, in order to facilitate the smooth progress of the whole process, avoid some unexpected phenomena and improve productivity. In addition, special environment also needs professional operation.


In general, only when all aspects are taken notice of, can it be ensured that the quality of PTFE products is good enough to continue to use. PTFE products also include PTFE tape for water, PTFE tape for gas, PTFE cable wrap tape, PTFE cable film, etc.