Polyurethane PU Processing Screw Barrel
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Polyurethanes are used in the manufacture of high-resilience foam seating, rigid foam insulation panels, microcellular foam seals and gaskets, durable elastomeric wheels and tires (such as roller coaster, escalator, shopping cart, elevator, and skateboard wheels), automotive suspension bushings, electrical potting compounds, high performance adhesives, surface coatings and surface sealants, synthetic fibers (e.g., Spandex), carpet underlay, hard-plastic parts (e.g., for electronic instruments), condoms and hoses. (Source - Wikipedia)
We make Screw barrel for PU extrusion as well as PU Injection Molding
Our Highly precised zero tolerance (0.1) and fair price policy make us the most reliable screw barrel manufacturer for PU industry.
screw diameter 32mm to 200mm
screw length Maximum 5 meter in one piece and up to 9 meter in two piece.
Barrel OD upto 300mm.
Material- EN41B nitriding steel, Musco grade.
Gas nitriding- Thickness from 0.5 to 0.7 mm, hardness ~ 60-70 HRC ~ 1000 HV.
Production time- Within 4 weeks depending on the complexity of the part.
Nitriding: Gas medium, Liquid medium, Plasma Medium (Require special order from customer)
Bimetalllic coating: ranging from 4% tungsten carbide powder coating to 88% tungsten carbide powder via HVOF robotic technology. (Require special order from customer)
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.
Screw Design
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)
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.
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