Teflon PTFE lining high viscosity in the gel state (it does not truly melt) prevents it from being processed conventionally in extruders or injection molding. PTFE tubing is therefore dry molded or extruded in hydraulic extruders with (paste extrusion) or without (ram extrusion) lubricants. Paste extrusion of PTFE yields flexible tubing. However, it occurs in a batch process and thus long continuous lengths are limited to the batch size, unlike the melt-processible fluoropolymers FEP, PFA and ETFE.
A ram extruder is an extruder where, instead of extrusion screw, a ram or plunger is used . The ram extruder was the earliest extruder to be used in the plastics industry. This typical process is applied for producing profiles, sleeves, rod, block, tubing, lining sheet bars, etc. The ram extrusion process is very effective for specific materials like PTFE which are not extruded successfully using screw extruder.
Jiangsu Sunkoo Machine Tech Co., Ltd is a leading Manufacturer and exporter of PTFE & UHMWPE machines having rich experience of more than 12 years in China.
Main Machines: PTFE & UHMWPE Rod Ram Extruder, PTFE Tube Ram Extruder, PTFE Semi-Automatic press molding machine, PTFE Full Automatic press molding machine, PTFE Gasket Machine,Sintering equipment.