PVC Door Frame Machine
Product Overview
The PVC Door Frame Extrusion Line produces rigid multi-chamber PVC door frame profiles up to 240mm wide. These profiles serve as structural frames for interior and exterior doors, requiring high rigidity, impact resistance, and precise dimensions for proper door installation and operation.
Built around an SJSZ-80/156 conical twin-screw extruder, this line features a multi-cavity die specifically designed for door frame profiles, a reinforced vacuum calibration table, and a heavy-duty haul-off unit capable of handling the substantial profile weight. Production speeds of 3-5 m/min deliver consistent output for door frame manufacturing operations.
Door frame profiles present unique challenges compared to window profiles — they require greater wall thickness (typically 2.5-3.5mm), more internal chambers for rigidity, and often include integrated features such as hinge reinforcement pockets, lock mechanisms channels, and weatherstripping grooves. Our die design accommodates these complex features while maintaining uniform material flow.
The line supports both single-material PVC door frames and co-extruded designs where a recycled PVC core is combined with a virgin PVC skin for cost optimization. This co-extrusion capability can reduce raw material costs by 20-30% while maintaining surface quality and mechanical performance.
Key Features
Conical twin-screw extruder
Multi-cavity die for door frame profiles
Reinforced vacuum calibration
Heavy-duty haul-off unit
Synchronized cutting system
Production Process
From raw material to finished product — each step is engineered for quality and efficiency.
Material Compounding
PVC compound with enhanced impact modifier (CPE 10-12 parts) and high filler loading (CaCO3 30-40 parts) is prepared for maximum rigidity and cost efficiency.
Extrusion & Plasticizing
The compound is processed at 170-190°C in the conical twin-screw extruder. Higher torque requirements for filled formulations are handled by the heavy-duty gearbox.
Multi-Cavity Die Forming
The precision die creates the complex door frame cross-section with multiple internal chambers, hinge pockets, and sealing grooves. Flow balancing ensures uniform extrusion.
Calibration & Cooling
The profile passes through a reinforced vacuum calibrator designed to handle the heavy profile weight. Extended cooling time ensures complete solidification.
Co-Extrusion (Optional)
A co-extrusion unit can apply a virgin PVC skin over a recycled core, reducing material costs while maintaining premium surface appearance.
Haul-off & Cutting
A heavy-duty haul-off unit pulls the profile through the cooling section. A synchronized cutter trims profiles to standard door frame lengths.
Technical Specifications
| Extruder Model | SJSZ-80/156 |
|---|---|
| Max Profile Width | 240mm |
| Cavity Structure | Multi-chamber |
| Production Speed | 3-5 m/min |
| Total Power | ~85-120 kW |
| Line Length | ~25m |
Why Choose Wings Plastic
Heavy-Duty Construction
Reinforced frame, oversized gearbox, and heavy-duty haul-off handle the weight and torque requirements of large 240mm door frame profiles with high filler content.
Multi-Chamber Die Design
Custom die creates 4-6 internal chambers for maximum rigidity while maintaining uniform wall thickness — critical for door frame structural performance.
Co-Extrusion Cost Savings
Optional co-extrusion system allows using recycled PVC for the core and virgin PVC for the visible surface, reducing material costs by 20-30% without quality compromise.
Integrated Features
Die accommodates integrated hinge reinforcement pockets, lock channels, and weatherstripping grooves — reducing post-extrusion machining requirements.
Extended Cooling
Longer calibration table and additional cooling zones ensure complete solidification of thick-walled profiles, preventing post-extrusion deformation.
Quality Assurance
Every production line undergoes rigorous quality verification before delivery:
- Profile straightness verified over 6m length using laser alignment
- Chamber wall thickness measured at multiple points to ensure structural integrity
- Surface hardness tested per Shore D to verify formulation adequacy
- Screw withdrawal resistance tested at hinge pockets to verify reinforcement
Typical Applications
Frequently Asked Questions
While the extruder can handle both, door frame dies and calibrators are significantly larger. We recommend dedicating the line to door frames for optimal efficiency, or planning for 4-6 hour changeovers.
Using recycled PVC core with virgin skin typically saves 20-30% on raw material costs. The co-extrusion unit is an optional add-on that pays for itself within 6-12 months depending on production volume.
For door frames, 30-40 parts CaCO3 provides good rigidity and cost efficiency. Higher loadings (up to 50 parts) are possible but may impact impact resistance. We provide formulation guidance based on your target market requirements.
Yes, the die is designed to accommodate standard European and American door hardware — hinge plates, lock mechanisms, and weatherstripping. Custom hardware integration can be designed upon request.
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