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How to Select a Suitable PVC Profile Extrusion Production Line?
一、According to the Profile Type:
● Door and window profiles / Wide-width Panels: Preferred use is a conical twin-screw extruder with a high-speed mold and a vacuum shaping table (such as the YF series profile production line).
● Multi-hole Threading Tube: It needs to be equipped with a multi-hole mold and a synchronous traction and cutting system, and the traction speed must be above 40m/min.
● Decorative Lines / Low-foaming Panels: High-end equipment with foaming screw technology and precise temperature control system is required.
二、Output Requirements of PVC Profile Extrusion Line
The basic PVC profile production line has an extrusion capacity of 60-700kg/h. If high production is required, a high-speed extruder can be selected (such as the main machine extrusion capacity ≥ 500kg/h).
三、Key Points for Selecting Core Equipment of PVC Profile Production Line
| Components | Key Parameters/Techniques | Recommended Configuration Examples |
| Extruder | Conical twin screws are preferred (to adapt to the characteristics of PVC materials), and must support variable frequency speed regulation and temperature control accuracy of ±1°C. | YF Series Parallel/Conical Twin Screw Extruder Unit |
| Mould | Customized according to the profile section, polished and hard-plated molds are recommended to improve surface finish | T-type mold (suitable for complex profiles) |
| Cooling & Calibration | The vacuum shaping table is ≥4 meters long and equipped with a cooling system. The vacuum degree reaches -0.096MPa to stabilize the profile size. | 11m long shaping table (suitable for wide panels) |
| Haul-off & Cutting | The traction force should be ≥10kN, the moving speed of the cutting machine should be synchronized with the traction force, and imported PLC control is recommended to achieve automatic fixed-length cutting. | Servo motor drive cutting system |
PVC Profile Production Line Structure
1. Batching System
● Function: Accurately measure and mix various raw materials required for the production of PVC door and window profiles, such as PVC resin, stabilizer, lubricant, filler, colorant, etc. Different formulas will determine the performance of the profile. For example, the amount of stabilizer added affects the weather resistance and thermal stability of the profile, and the filler will change the cost and certain physical properties of the profile.
● Working Process: The raw materials are transported to the batching scale through the automatic feeding device. The batching scale accurately weighs each raw material according to the preset formula, and then fully mixes them in the high-speed mixer to prepare for subsequent extrusion molding.
2. Extrusion System
● Function: The mixed raw materials are heated and plasticized and extruded through a specific die to form the required profile shape. This is the core link of the production line and determines the basic appearance and dimensional accuracy of the profile.
● Working Process: The mixed material enters the extruder barrel and is pushed by the rotation of the screw. The material is heated, sheared and compressed in the barrel and gradually plasticized. When the material reaches a suitable flow state, it is extruded through a die that matches the shape of the profile to initially form the profile outline.
3. Cooling & Calibration System
● Function: The hot extruded profile is quickly cooled to fix the shape and keep the dimensions stable. This step is crucial to the dimensional accuracy and surface quality of the profile.
● Working Process: The newly extruded profile enters the cooling and shaping die, where it is cooled by circulating water inside the die, causing the profile surface to cool down and solidify quickly. Subsequently, the profile is further cooled by a spray water tank to ensure that the entire cross section can be fully cooled and shaped.
4. Haul-off System
● Function: The cooled and shaped profiles are pulled out of the production line at a stable speed, while the length and stretching ratio of the profiles are controlled to ensure the dimensional accuracy and internal structural uniformity of the profiles.
● Working Process: The traction machine clamps the profile through rubber rollers and pulls the profile at a set speed. The traction speed must match the extrusion speed to avoid problems such as excessive stretching or accumulation of the profile.
5. Cutting System
● Function: According to the set length, the continuous profile is cut into the required fixed-length products to facilitate subsequent processing and use.
● Working Process: When the profile reaches the set length, the saw blade of the cutting device starts quickly to cut the profile. The cut profile is transported to the stacking area through the conveyor device.
6. Stacking system
● Function: The cut profiles are stacked in order for easy storage and transportation.
● Working Process: The conveying device places the cut profiles steadily on the stacking rack and arranges them according to certain rules to ensure that the profiles are stacked neatly to avoid deformation and damage.