Fluoroplastic secondary processing technology.

Update:24 Aug 2018
Summary:

Due to the processing characteristics of the fluoroplas […]

Due to the processing characteristics of the fluoroplastic , it is difficult for some products to be molded at one time, and secondary processing is required to obtain a usable finished product. Secondary processing techniques include cutting, welding, lining, and inflation.
Cutting: Similar to metal cutting methods, the equipment has lathes, drilling machines, planers and so on. Note that the blank must be placed for 24 hours before cutting.
Welding: divided into two types: hot-press welding and hot-air welding. Hot-press welding is to be heated to 327 ° C or higher in a special clamp, and the pressure can be welded.
Hot-air welding rod welding is carried out by PFA purlins, which are heated and pressurized through PFA to connect the two pieces together.
Lining: Generally, PTFE black metal pipe and pipe fittings are lining with polytetrafluoroethylene and polyperfluoroethylene propylene (written in F4 and F46), which can be used for chemical anticorrosive and corrosion resistant materials.
Inflating: the product is a bellows and heat shrinkable tube, a heat shrinkable film, and the like. It is divided into continuous inflation and intermittent inflation.
For example, the tube blank of F46 heat shrinkable tube is prepared by water cooling vacuum setting method, the tube draw ratio is 3-7, the melting cone length is controlled at 10-20 mm, the inflation mold temperature is 80-160 ° C, and the inflation pressure is 0.1-. 0.2 MPa, traction line speed 80-500 mm / min. Others have inflated F4 spiral tubes.