WPC Door Frame Machine
Product Overview
The WPC Door Frame Machine produces solid-structure wood-plastic composite door frames that provide a durable, moisture-resistant alternative to wooden door frames. These frames maintain dimensional stability in humid environments, eliminating the warping, swelling, and rotting that plague wooden frames.
Built around an SJSZ-80/156 conical twin-screw extruder, the line features a solid profile die for door frame cross-sections, reinforced calibration table, and online surface treatment system. It produces frames 100-250mm wide and 30-40mm thick with 30-50% wood powder content, matching standard door frame dimensions.
WPC door frames are solid profiles — unlike the hollow door panels — because frames must support the door weight, hinge loads, and installation stresses. The solid cross-section provides superior screw retention for hinge mounting and structural connections, with screw withdrawal resistance comparable to medium-density wood.
The online surface treatment system applies wood grain finishes via hot stamping or lamination, creating frames that visually match WPC door panels for a coordinated appearance. The surface treatment also provides UV resistance for frames exposed to sunlight through glass doors.
Key Features
Conical twin-screw extruder
Solid profile die for door frames
Reinforced calibration table
Online surface treatment
Cutting and stacking system
Production Process
From raw material to finished product — each step is engineered for quality and efficiency.
Wood-PVC Compound Mixing
Dried wood flour (60-80 mesh, <2% moisture) is mixed with PVC powder, coupling agents, stabilizers, and lubricants in a high-speed hot/cold mixer system.
Extrusion
The WPC compound is plasticized at 155-175°C in the conical twin-screw extruder. Temperature control prevents wood fiber degradation while ensuring complete PVC gelation.
Solid Profile Die Forming
The molten WPC flows through a solid profile die creating the door frame cross-section with hinge reinforcement areas and sealing grooves.
Calibration & Cooling
A reinforced vacuum calibrator handles the heavy solid profile. Extended cooling ensures complete solidification without internal stress or warping.
Surface Treatment
Wood grain hot stamping or film lamination applies a decorative finish matching WPC door panels. UV stabilizers in the finish protect against sunlight exposure.
Cutting & Packaging
Profiles are cut to standard door frame lengths (2100mm, 2200mm) with synchronized cutting. Frames are packaged with protective wrapping.
Technical Specifications
| Extruder Model | SJSZ-80/156 |
|---|---|
| Frame Width | 100mm - 250mm |
| Frame Thickness | 30mm - 40mm |
| Wood Powder Content | 30-50% |
| Production Speed | 2-4 m/min |
| Total Power | ~100-150 kW |
Why Choose Wings Plastic
Solid Structure
Unlike hollow WPC doors, door frames are solid profiles providing superior screw retention and structural support — essential for hinge mounting and door weight bearing.
Dimensional Stability
WPC frames don't warp, swell, or rot in humid conditions — eliminating the primary failure mode of wooden door frames in bathrooms, kitchens, and tropical climates.
Matching Finishes
Online hot stamping applies the same wood grain patterns as WPC door panels, creating visually coordinated door and frame sets for premium interior packages.
Coupling Agent Chemistry
Maleic anhydride coupling agents chemically bond wood fibers to PVC, achieving screw withdrawal resistance comparable to MDF — sufficient for standard door hinge installation.
Pre-Drilling Not Required
The solid WPC structure allows direct screw driving without pre-drilling (unlike hollow profiles), simplifying installation and reducing labor costs on construction sites.
Quality Assurance
Every production line undergoes rigorous quality verification before delivery:
- Screw withdrawal resistance tested at multiple points along the frame
- Profile straightness verified over full length using laser alignment
- Surface finish inspected for pattern consistency and adhesion quality
- Moisture absorption tested per 24-hour water immersion protocol
Typical Applications
Frequently Asked Questions
Yes, solid WPC frames with proper coupling agents provide screw withdrawal resistance of 150-250 N/mm — comparable to MDF and sufficient for standard interior doors up to 40kg. For heavier doors, metal reinforcement inserts are recommended.
Yes, we use the same wood grain hot stamping foils for both doors and frames, ensuring visual consistency. Custom patterns can be developed for coordinated door and frame packages.
WPC frames cost 20-40% less than solid wood frames of equivalent dimensions. The cost advantage increases with wood powder content. Additionally, WPC frames require no painting, further reducing installed cost.
Yes, WPC frames can be cut, drilled, and routed using standard woodworking tools. Carbide-tipped blades are recommended for clean cuts. No special equipment is needed.
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