Advantages - WK Paste Extruder / PTFE Extruder

Long service life through solid workmanship and use of high quality componentes
Low wall thickness tolerance through self-centering mandrel and special nozzle
Additional heatable extrusion cylinder for better extrusion quality
Measurement transducer like pressure, force and ram speed for permanent control of the extrusion process and extrusion speed
Hydraulic closure with high closing force for quick loading of the extruder
Quick loading with special loading carriage - also possible with several pre-forms, no manual touch
Special pre-form press with pre-form preparation device for multiple loading of the loading carriage i.e. extruder
Electrically adjustable mandrel
Measuring and controlling system for constant extruder speed
Controlling system for constant speed of the extrudate
Low space requirement through vertical construction
Front and back charger, vertical and horizontal possible with hydraulic and spindle drive (2 degrees of accuracy)
Delivery of complete systems possible (PTFE processing, pre-form press, paste extruder oven, winding unit as well as convoluting machine)
User-friendly and maintenance-free system
Special drying and sintering oven with adjustable blind, thus a better temperature guidance within the two zones and avoidance of explosion hazard
The paste extrusion systems are designed especially to costumers requests
Automatic adjustment of the total system as well as recording of the formula
Operating through touch screen and recording of the extrusion process parameters

Extrusion process with WK paste extruders

Paste extrusion is a process for the production of thin hoses, thick tubes (liners), wire insulation and unsintered tapes of PTFE. For the PTFE paste technique exclusively emulsion polymerization powder is used. The paste is a mixture of these spongy PTFE powder types with wetted organic fluids like gasoline, light oil etc.
The process is done in batch quantities:
The PTFE lubricant mixture firstly is pre-pressed to so-called billets (pre-forms, candles) and then put into a paste extruder which works on the principle of the ram extrusion. Then the billets are pressed through a conic nozzle in cold or slightly pre-heated condition (approx. 40-60°). The extrudate is seperated from the still containing lubricant within the drying zone and then sintered.

(See schematic design of a modern paste extruder)

At the moment more than 27 different types of paste extruders (diam.1 – 300 (600)mm, force 100 – 1500kN) for downloading respectively frontloading are available. They can also be delivered for back loading. The extruder are hydraulic respectively gear spindle driven. We also can deliver you a tailor-made system, if requested. Select your paste extruder resp. your requested system.

We have a lot more paste extruders at our disposal than listed below.