The optimal extruder barrel length for TPUs is 30-32 times its internal diameter (30:1 L/D, 32:1 L/D). Although shorter barrels such
as 24:1 can be used, mixing efficiency and melt uniformity may be less than optimal. Cooling the extruder feed throat is critical to prevent
surging or bridging. Internal cooling to the screw is not needed.
Excellent-quality product has been obtained consistently with screws having the following characteristics:
Barrier screw construction
Compression ratio of 3:1
Long transition section (30% 45% of screw length)
A properly designed screw should melt the pellets and subsequently homogenize the TPU melt completely, and Barrier-type screws will give the best-quality output, and several
designs have been used successfully. A mixing section is suggested at the end of the screw, particularly if color concentrates are added.
The best performance has been with the Saxton and pineapple-type mixers.
Extrusion molding thermoplastic polyurethane elastomer is suitable for the following applications:
1.Air Bag, Cable & Wire, Belt, Film & Sheet and other extrusion parts.
2.Hose Material: Air Tube, Hose, Fire Hose, Cable & Wire.
3.Sheet Material: Film, Sheet, Conveyor Belt.
Our Screw barrel are used in PU Tube Plant, PU Pipe Extrusion Line Manufacturer
PU Tube Extrusion Line
Extruded polyurethane profiles
PU Spring extruder
pu shoes injection moulding machine
Pu Injection Moulding Machine
RIM Reaction Injection Molding - Polyurethanes
RMC - Reaction Injection Molding Polyurethane(RIM-PU)
Creating Polyurethane Products - Polyurethane Moldings
PU Foam Manufacturing
Polyurethane (PUR and PU) is a polymer composed of organic units joined by carbamate (urethane) links. While most polyurethanes are thermosetting polymers that do not melt when heated, thermoplastic polyurethanes are also available. Polyurethane polymers are traditionally and most commonly formed by reacting a di- or tri poly-isocyanate with a polyol. Both the isocyanates and polyols used to make polyurethanes contain, on average, two or more functional groups per molecule.