PVC Door Frame Extrusion Machine Line

The PVC/WPC door frame extrusion equipment is a technology intensive production line that focuses on producing decorative profiles such as indoor door frame lines and window frame lines with high added value and high surface requirements.

 

 

This equipment uses extrusion molding technology to continuously produce door frame profiles with excellent wooden appearance and plastic properties.

·PVC door frame: mainly made of PVC resin and calcium carbonate as raw materials, manufactured through micro foaming technology to make its texture lighter, and the surface imitates high-end wood grain through film coating or transfer printing.

·WPC door frame: Wood Plastic Composite material, with raw materials including wood powder, PVC resin, and additives. It has a stronger solid wood feel, density, and texture, and can undergo secondary processing such as sawing, planing, and sanding, making it closer to natural wood and more environmentally friendly.

Final products: high-end indoor door frames, window frames, skirting boards, and decorative lines with various complex cross-sections.

 

 

Automatic feeding → High speed hot mixing → Cold mixing → Extruder plasticization → Mold forming → Vacuum shaping → Cooling → Traction → * * Surface treatment (core process) * * → Fixed length cutting → Automatic stacking

 

 

(1) Mixing system - the cornerstone of quality

·Extremely important: Door frame materials (especially WPC) have extremely strict requirements for mixing uniformity and temperature control, directly determining the density and surface quality of the finished product.

·High speed hot mixer+cold mixer: must be equipped with a high-precision temperature control system. For WPC, it is necessary to ensure that the wood powder is fully soaked and dispersed with PVC resin and additives. Excessive temperature can cause the wood powder to coking and turn black. The cold mixer needs to quickly cool the material to below 40 ℃ to prevent clumping and pre plasticization.

 

(2) Extrusion system

·Cone shaped twin screw extruder: It is an absolute mainstream choice, but there are special requirements for door frame production:

·Efficient cooling system: WPC material contains wood powder, which generates high friction heat during extrusion. Therefore, the screw and barrel must be equipped with an efficient forced water cooling system to prevent material overheating and degradation, ensuring production stability.

·High torque design: With a large amount of wood powder and filler filling and high melt viscosity, the extruder drive system needs to have high torque output capability to ensure smooth operation under high loads.

·Wear resistance: Wood powder and calcium powder are strong wear-resistant materials, and the surface of the screw and barrel needs to be treated with double alloy nitriding or other advanced wear-resistant treatments to significantly extend the service life of the equipment.

 

(3) Forming and shaping system - accuracy determines success or failure

·Mold (Die):

·Technical core, complex structure. Precise design of the flow channel is required to ensure absolute uniformity in density and strength, and to avoid warping.

·For Co extrusion door frames (such as covering the surface with a layer of PVC protective layer of different colors), complex co extrusion molds and matching co extrusion machines are required.

·For micro foamed PVC door frames, mold design needs to consider the uniform release and control of foaming gas.

·Vacuum Calibrator Tank:

·The most critical equipment to ensure the dimensional accuracy and surface smoothness of door frames. Usually, it is a multi-stage design (4-6 stages or more), with the first stage responsible for rough shaping and the subsequent stages responsible for fine cooling and shaping.

·The design of the water tank should be reasonable to ensure even cooling and avoid internal stress warping caused by uneven cooling rates inside and outside the product.

 

(4) Traction system

·Caterpillar Haul off:

·Strong, stable, and even traction must be provided. Track blocks are usually customized according to the special shape of door frame products to increase the contact area and avoid crushing or scratching the surface of the product.

 

(5) Surface treatment system - the core link of value-added

This is the biggest difference between door frame thread and ordinary profile thread, which directly determines the final value and market competitiveness of the product.

·Option A: laminating unit - the most mainstream and most effective

·A layer of PVC/PET decorative film with high-definition wood grain and wear-resistant layer is laminated on the surface of the profile under high temperature and high pressure.

·Advantages: The finished product has excellent surface texture, waterproof, wear-resistant, scratch resistant, realistic wood grain, no need for post painting, and high efficiency.

·Plan B: UV Transfer Printing

·First, spray primer on the surface of the profile, then transfer the UV ink pattern onto the profile using a silicon glue roller with wood grain, and finally cure it with UV light.

·Advantages: Good effect, possibly lower cost than laminating, can achieve complex textures.

·Option C: Painting Line

·Mainly used for WPC door frames for surface coloring and treatment, which can retain more woody texture.

 

(6) Cutting and collection system

·Planetary cutting machine:

·Absolutely preferred. Door frames are usually solid or thick walled profiles. The circular saw blade of the planetary cutting machine revolves around the profile while rotating, allowing for precise cutting at 45 ° or 90 ° angles without squeezing or chipping, directly preparing for subsequent corner assembly.

·Automatic Stacker: Receive cut products and stack them in an orderly manner, greatly reducing manual labor and avoiding surface scratches.

 

 

Characteristics: PVC microcellular foam door frame, WPC door frame

Raw material PVC resin, large amount of calcium powder, foaming agent PVC resin, high content wood powder (40% -70%), additives.

The core requirements of the equipment require foam molds, which are extremely sensitive to temperature control. The extruder requires strong cooling, high torque, and ultra-high wear resistance.

Product features: lightweight, low cost, high hardness, heavy surface dependence on film coating, solid wood texture, can be reprocessed, environmentally friendly, warm touch.

Surface treatment must be coated with film, UV transfer printing or spray coating, choose more samples.

Market positioning in the mid-range and economy oriented market, with a large volume in the high-end market, replacing solid wood, and high profit margins.

 

 

1. Clarify product positioning: Firstly, decide whether to focus on the PVC or WPC market, which determines the investment scale and technical route.

 

2. Capacity and model matching: Select extruder models (such as SJSZ55/110, 65/132, etc.) based on market expectations. The larger the model, the higher the output.

 

3. Quality of molds and shaping tables: This is the soul of technology, directly determining the yield rate. Be sure to choose a supplier with years of experience in door frame mold design.

 

4. Surface treatment plan: The film coating plan is currently the most mature and widely accepted choice in the market, and should be considered as the preferred configuration.

 

5. Automation and Intelligence: Evaluate the degree of automation of the entire production line, such as automatic feeding, online monitoring, automatic packaging, etc., to reduce reliance on manual labor.

 

6. Comprehensive strength of suppliers: Priority should be given to suppliers who can provide "turnkey projects", including equipment, molds, formulation processes, installation and commissioning, technical training, and after-sales services. Be sure to ask them to provide samples and conduct on-site inspections.

 

Summary: Investing in a PVC/WPC door frame production line is a significant decision, as its technical complexity and investment amount are much higher than ordinary sheet metal lines. The key to success lies in choosing a comprehensive and experienced equipment supplier who can provide you with a one-stop solution from raw material formulation to final product.

 

 

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