Welcome to ANDA
Welcome to ANDA
In today’s building world, people want materials that last longer, cost less over time, and don’t hurt the planet as much. Wood-plastic composite (WPC) door frames have become a popular choice for exactly those reasons. Builders, contractors, and homeowners like them because they resist water, bugs, and rot—problems that regular wood doors always face.
But how do factories make these tough, good-looking frames in large quantities? That’s where a WPC door frame profile production line comes in. It’s the complete setup that turns simple raw materials into finished door frames ready for doors anywhere in the world.
This guide walks you through everything: what WPC really is, how the line runs day to day, why it matters for your projects, and what to think about if you ever need to produce or buy these frames.
WPC stands for wood-plastic composite. Manufacturers mix fine wood powder—often from recycled sawdust—with plastic resins (usually PVC or PE) and a few additives. The result looks and feels a lot like real wood, yet it laughs at moisture and termites.
Traditional wooden door frames swell, crack, or get eaten by insects in damp bathrooms or outdoor entrances. Pure PVC frames can feel cheap and sometimes bend in hot sun. WPC sits right in the middle. It keeps the warm look of timber but adds the toughness of plastic.
A finished WPC door frame won’t rot if water splashes on it for years. It doesn’t need paint every few seasons. And because factories use recycled wood waste and plastic, it’s a greener option than cutting fresh trees.
Walk into any new apartment building in Asia, the Middle East, or South America these days, and chances are the interior door frames are WPC. Why the sudden love?
· Zero termite worries — big deal in tropical countries.
· No warping in humid bathrooms or kitchens.
· Easy cleaning — just wipe, no repainting.
· Fire resistance is usually better than solid wood.
· Matches perfectly with WPC or laminate flooring because you can print wood-grain or marble patterns right on the surface.
All of that comes from running the material through a proper WPC door frame profile production line. Without the right equipment, you can’t get the density, surface finish, and strength that make these frames stand out.
A modern WPC door frame profile production line isn’t just one machine—it’s a series of stations working together like an assembly line. Each part has a job, and everything runs continuously once it’s dialed in.
Everything starts with wood powder (40–60%) and plastic granules. Factories dry the wood powder first so it doesn’t clump. Then high-speed mixers spin everything together with additives—stabilizers, coupling agents, lubricants, and sometimes color pigments. The mix comes out looking like coarse sand, ready to melt.
The mixed material drops into a twin-screw extruder. Two intermeshing screws turn inside a heated barrel, pushing and melting the blend under high pressure. Special screw designs made just for wood-plastic mixes prevent burning the wood fibers while still melting the plastic perfectly. Temperatures run between 160–190 °C, carefully controlled zone by zone.
The molten material gets forced through a custom die—the metal plate that gives the door frame its exact cross-section. Dies can make hollow frames, solid ones, frames with gasket grooves, or even folding-door profiles. Right after the die, the soft profile enters a vacuum calibration table.
Water tanks and vacuum pull the hot profile tight against cooling calibrators. This step locks in the exact dimensions and creates a smooth skin. Without strong vacuum, the frame would swell or warp as it cools.
A caterpillar haul-off with soft rubber pads grabs the cooled profile and pulls it at a steady speed—matching the extruder output perfectly. An automatic flying saw cuts the frames to 2.2 m, 3 m, or whatever length the customer wants. Finally, a stacker gently lays them down for packing.
Many lines include online embossing rollers that press wood-grain texture while the surface is still warm. Others add lamination units that glue on PVC foil with marble, oak, walnut, or teak designs. Some factories even print directly with UV printers for photorealistic looks.
Machine | What It Does | Why It Matters |
High-speed hot/cool mixer | Blends wood powder + plastic + additives | Even mixing = consistent quality all day long |
Conical twin-screw extruder | Melts and pushes the compound | Gentle on wood fibers, high output, stable pressure |
Profile die & calibrators | Forms and cools the exact shape | Determines final dimensions and surface smoothness |
Vacuum calibration table | Strong cooling + sizing | Prevents warping, gives glossy skin |
Haul-off unit | Pulls the profile at constant speed | No stretching or thickness variation |
Automatic cutter | Cuts to length with dust collection | Clean cuts, safe operation |
Stacker / tipping table | Collects finished frames | Reduces handling damage |
Optional embossing / lamination | Adds texture or printed foil | Makes frames look like real wood or stone |
Factories that try to make door frames on a general-purpose WPC decking line usually regret it. Door frames need tighter tolerances, smoother surfaces, and perfect corners for miter joints. A dedicated WPC door frame profile production line delivers:
· Higher daily output — 2–3.5 tons per 24 hours is common.
· Less material waste — precise control means almost no rejected pieces.
· Better surface quality — customers love frames that look painted right out of the machine.
· Flexibility — switch dies in a couple of hours to run skirting, architraves, or window sills on the same line.
· Large residential developers building thousands of apartments.
· Hotel chains renovating bathrooms and corridors.
· Door manufacturers who want ready-made frames instead of machining wood.
· Export companies shipping flat-packed frames to Africa, Middle East, and Latin America.
Even the best WPC door frame profile production line needs care. Clean the screws every 3–6 months. Check vacuum pump filters weekly. Keep spare calibrator plates on hand. Train operators to watch melt pressure—if it climbs too high, wood fibers might be scorching. Simple habits like these keep the line running 20+ hours a day with almost no downtime.
Based in Zhangjiagang, China—right in the heart of the country’s extrusion machinery cluster—Zhangjiagang Anda Machinery Co., Ltd. has focused on plastic and WPC extrusion lines since 2013. With a 3,000 m² factory and more than 40 skilled workers, they have delivered over 1,000 complete lines worldwide. Their WPC door frame profile production lines are known for reliable European-brand electrics, thoughtful designs that make die changes fast, and strong after-sales support—including engineers who fly out for installation and training. Customers in Saudi Arabia, India, Vietnam, Turkey, Colombia, and many other countries keep coming back because the machines simply run, day after day.
A well-designed WPC door frame profile production line has changed how the building industry thinks about interior doors. It takes recycled waste materials and turns them into frames that outlast wood, cost less to maintain, and look beautiful for decades. Whether you’re a contractor tired of replacing rotted wooden frames or a factory owner looking to enter the fast-growing WPC market, understanding how these lines work helps you make smarter choices.
A: Mostly wood powder (40–60%) from recycled sources and PVC resin, plus small amounts of additives for strength, UV protection, and color.
A: On a good line, changing from, say, a 100 mm door jamb to a skirting profile takes 2–4 hours—mostly heating the new die and adjusting calibrators.
A: Yes. Because plastic surrounds every wood fiber, termites can’t eat it. Many projects in Southeast Asia and Africa now specify WPC frames for that reason alone.
A: Absolutely. You just change the die and calibrator set. Many factories run hollow for interior use and solid for higher-impact areas on the same line.
A: Very. Most wood powder comes from sawmill waste, and many factories now use recycled PVC too. Plus, the frames themselves last decades longer than wood, so far less replacement waste over time.
