92-188 Higher Output Conical Twin Screws with Barrel For Standard Twin Screw Co-Rotating Extruder PVC Calcium

Size: 92-188
Applied Machine:CINCINNATI, BATTENFELD, KRUSSMASSEI,BAUSANO
Applied Plastics & Products:
PP,PE,ABS,PVC,Pelleting,Pipe,Profile,Sheet,WPC,PVC,Soft PVC etc
Delivery Time: 15 days
Base Materials: SACM645,SCM440
Treatment: Nitrided/Bimetallic/Chrome-Plating
Hardness: HRC65-HRC70

Product Description:

Materials of Twin Conical Screw Barrel Twin conical screw barrels are designed to endure high wear, corrosion, and thermal stresses in plastic extrusion. Common materials include:

•Alloy Steel:

•38CrMoAlA: A nitrided steel favored for its strength, toughness, and wear resistance. Nitriding achieves surface hardness of HV850-1000.

•42CrMo: Used for high torque and durability.

•304 Stainless Steel: Chosen for corrosion resistance, ideal for processing corrosive materials like PVC.

•Bimetallic Coatings: Nickel-based or tungsten coatings enhance wear and corrosion resistance, especially for abrasive or corrosive polymers.

•Surface Treatments:

•Nitriding: Boosts surface hardness (HB280-320, HV920-1000) and wear resistance, with a depth of 0.45-0.80 mm.

•Chrome Plating: Reduces adhesion and corrosion, typically 0.025-0.10 mm thick.

•Molybdenum/Tungsten Coatings: Protect screw flights, extending lifespan for high-filler or regrind materials.

Material selection depends on the polymer (e.g., PVC, PP, PE) and additives (e.g., calcium carbonate), as some, like chlorine-based compounds, are highly corrosive.

•Function of Twin Conical Screw Barrel

Twin conical screw barrels are key components in twin-screw extruders for processing plastics, rubber, and composites. Their functions include:

•Material Conveying: The conical design (larger diameter at the feed end, smaller at the discharge) efficiently transports raw material from the hopper to the die.

•Mixing and Homogenization: Intermeshing screws provide excellent shear and mixing, ensuring uniform dispersion of additives, fillers, and colors in the melt.

•Plasticizing and Melting: The screws compress and heat the material, converting it into a homogeneous melt through controlled shear and heat transfer.

•Compression and Extrusion: The conical taper increases pressure, compacting the melt for consistent extrusion through the die, ideal for profiles, pipes, or sheets.

•Versatility: Optimized for processing materials like PVC, which requires gentle handling due to thermal sensitivity, and suitable suitable for high-output applications like SPC flooring or PVC pipes.

The conical design offers higher torque and better pressure build-up compared to parallel screws, improving output and quality for specific applications.

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FAQS：

Q: When will you arrange the production?
A: We can arrange the production after order & drawings confirmation

Q: What is your factory delivery time ?
A: Standard delivery time is 20-25 days

Q: What is your accepted payment type?
A: T/T

Q: What logistic forwarder do you usually work with?
A: We work with UPS, TNT, FEDEX, SF and other logistric forwarders. Assigned your own forwarder for shipment is available.

Q: What is your warranty Time ?
A: Our warranty time is 12 months when shipment on board