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Main Description
The conical twin screw and barrel assembly represents a type of twin-screw equipment utilized in the field of polymer processing; it features an intermeshing, counter-rotating configuration characterized by a large diameter in the feeding section and a smaller diameter in the homogenization section, thereby facilitating the forced conveyance of materials. This equipment is suitable for the processing of plastics—such as PVC and polyolefins—and its applications have expanded into other sectors, including explosives and wood-plastic composites.
The core application focus of the conical twin-screw extruder lies in the molding of heat-sensitive materials and high-pressure processing operations.
Its primary application scenarios are concentrated within the PVC processing sector, encompassing the extrusion molding of PVC-U pipes, profiles, and sheets, as well as the production of foamed PVC products. Counter-rotating conical twin-screw extruders are frequently employed for processing rigid PVC. In municipal pipeline engineering, the PVC-M pipes produced by this equipment exhibit a ring stiffness of ≥8 kN/m², thereby meeting the rigorous strength requirements of municipal infrastructure projects.
The high-pressure, stable conveying characteristics of the conical twin-screw extruder make it well-suited for specialized fields, such as the processing of wood-plastic composites. Furthermore, conical co-rotating twin-screw extrusion technology is specifically applicable to the extrusion molding of blended wood-plastic products.
Benefiting from the advantage of requiring minimal material input, micro conical twin-screw extruders are utilized in precision processing scenarios such as laboratory-scale polymer synthesis, the preparation of pharmaceutical co-crystals, and solvent-free reactions. Micro conical twin-screw blending extruders and micro injection molding machines—which require an initial batch input of less than 5 grams—are widely employed in undergraduate laboratory instruction.
Conical co-rotating twin-screw extrusion technology has achieved industrialized application in various areas, including plastic granulation and profile extrusion. The specific power consumption of this technology is approximately 0.07 kW/(kg·h), representing a reduction in energy consumption compared to traditional equipment.
Direct answer: A conical twin screw and barrel is the plasticizing core of a conical twin screw extruder. The pair conveys, mixes, melts and pressurizes PVC compound before the die. Selection must match the extruder model, screw diameter, conical geometry, center distance, barrel cooling, PVC formulation and target output.
The twin screws work together inside the barrel to provide conveying, mixing and plasticizing. In a PVC pipe, profile, board or panel line, the screw and barrel should be considered together with the mixer, feeder, die, vacuum calibration table, haul-off and cutter. A larger extruder alone does not guarantee stable product quality if the screw geometry or tooling is mismatched.
PVC pipe extrusion with a die and calibration system matched to the required diameter range.
PVC window, door and decorative profile production with the correct profile screw design.
PVC foam board, ceiling panel and other rigid PVC board applications after formula and tooling confirmation.
Replacement of worn conical screws and barrels when the original dimensions and connection details are available.
Selection Point | Required Check |
|---|---|
Extruder model and screw specification | Confirm the conical dimensions, screw length, center distance and installation connections. |
PVC formula and filler ratio | Confirm the plasticizing requirement, abrasive loading and corrosion conditions. |
Product and die | Match screw design to pipe, profile, board, panel or other finished section. |
Output and process temperature | Confirm the required conveying, melting and cooling stability. |
Wear condition | Choose repair or replacement after checking screw flights, barrel bore and surface condition. |
Please provide the extruder brand and model, screw drawing or worn sample, screw length and diameter, barrel drawing, PVC material formula, calcium-carbonate or other filler ratio, target output, product drawing, surface-treatment requirement, voltage and delivery destination. These details help Winsoar recommend a compatible conical twin screw and barrel instead of a generic size.
With suitable screw geometry, die and downstream equipment, it can support PVC pipe, profile, board, panel and related rigid PVC extrusion projects. The finished product range depends on the complete line configuration.
The screw flights and barrel bore work as one plasticizing chamber. Incorrect clearance, geometry or connection dimensions can affect pressure, melting, output and wear.
A different base or surface material should be considered only after checking the polymer, filler, temperature, corrosion and wear conditions. The machine drawing and process data should be reviewed before approval.
Compare this product with the Extruder Screw and Barrel category, Twin Screw Extruder category, bi-metallic alloy screw and barrel and single screw and barrel.
A conical twin screw and barrel is the plasticizing core of a conical twin screw extruder. The matched pair conveys, mixes, melts and pressurizes PVC compound before the die. It is commonly used in PVC pipe, window profile, door profile, foam board, ceiling panel and other rigid PVC extrusion lines. The assembly must be matched to the extruder, product section, PVC formula, filler ratio, output and temperature control.
Application | Selection focus |
|---|---|
PVC pipe extrusion | Pipe diameter, wall thickness, die resistance, output target and plasticizing stability. |
PVC profile extrusion | Profile section, filler ratio, melt uniformity, die pressure and surface quality. |
PVC foam board or panel | Formula, foaming behavior, mixing, temperature control and output stability. |
Replacement or upgrade | Original machine drawing, screw dimensions, barrel bore, wear condition and connection details. |
The two conical screws operate inside the barrel as one plasticizing system. Incorrect center distance, conical geometry, screw length, flight clearance or connection dimensions can cause unstable feeding, poor melting, pressure fluctuation, excessive wear or difficulty maintaining product dimensions. A replacement should therefore be selected by machine data and process requirements, not by the words “twin screw” alone.
Important technical inputs include the small and large screw diameters, screw length, center distance, barrel bore, heating and cooling zones, drive connection and die-side connection. PVC formula and filler ratio are equally important. Calcium carbonate, stabilizers, lubricants and other additives affect torque, plasticizing behavior, corrosion risk and wear.
Pipe projects: confirm diameter range, wall thickness, output and die pressure.
Profile projects: provide the profile drawing, filler ratio and required surface quality.
Board and panel projects: provide formula, foaming or density target, output and temperature window.
Replacement projects: send the worn set, drawing, nameplate or measured dimensions before quotation.
Wear may be accelerated by abrasive filler, corrosive additives, unstable processing, unsuitable clearance or contaminated feed. The screw flights and barrel bore should be inspected together. Depending on the actual condition, the practical solution may be repair, re-coating, a new screw, a new barrel or a complete matched set. Surface treatment should be chosen according to the PVC compound and operating conditions.
Condition | Technical review required |
|---|---|
High calcium-carbonate or mineral filler | Check abrasion resistance, clearance, torque and expected service life. |
Corrosive PVC additives | Check corrosion resistance, temperature control and surface treatment. |
High output or thick product | Confirm conveying, melting, cooling and die-pressure requirements. |
Worn or repaired equipment | Measure the screw flights, barrel bore, centerline and connection dimensions. |
Provide the extruder brand, model, motor power and nameplate information.
Confirm the small and large screw diameters, screw length and center distance.
Provide barrel bore, barrel length, heating zones, cooling arrangement and connections.
State PVC formula, filler ratio, product type, target output and operating temperature.
Send the original drawing, worn sample, dimensional measurements and clear photographs.
Confirm material, surface treatment, delivery destination and installation requirements.
With the correct design and downstream tooling, it can support PVC pipe, profile, board, panel and related rigid PVC extrusion projects.
No. The conical dimensions, center distance, screw length, barrel bore, drive connection and process formula must be compatible with the machine.
They should be inspected together. If the clearance or bore condition is outside the process requirement, replacing only one part may not restore stable plasticizing and output.
Winsoar can review the machine data and process information to recommend a compatible conical twin screw and barrel rather than a generic spare part.
Specifications
Specification:
Model:
Φ45/97
Φ51/105
Φ55/113
Φ65/132
Φ80/155
Φ92/188
Φ115/225
Base material:
1)38CrMoAlA(JIS SACM645)
2)42CrMo(AISI 4140)
Process:
Heat treatment
Nitriding treatment
Technical Parameters:
Nitriding depth | 0.50mm-0.80mm |
Nitriding hardness | 900-1000HV |
Nitriding | <= Level 1 |
Surface roughness | Ra 0.4 |
Screw straightness | 0.015mm |
hardness after chrome plating | ≥950HV |
Chromium layer thickness | 0.025~0.085mm |
Factory & Shipment
