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  4. A collection of problems in the producti...

A collection of problems in the production process of PVC pipes

A collection of problems in the production process of PVC pipes

Every new operator must have encountered a lot of big and small questions when operating PVC pipe equipment.Here are some solutions to the conventional questions.
Main points of PVC pipe production process control
1. Process temperature: During start-up and normal production, temperature is one of the main factors affecting plasticization and product quality. Polyvinyl chloride plastic has poor thermal stability and is easy to decompose at high temperature. The temperature of each section must be strictly controlled; if the temperature is too low, the plasticization is not good, and the quality of the pipe is poor; if the temperature is too high, the material is easy to decompose. The specific operating temperature should depend on the raw material formula, extruder and head structure and screw speed.
2. Screw cooling: Hard polyvinyl chloride has a high melt viscosity and poor fluidity. In order to prevent the temperature of the screw from rising due to excessive friction heat and decomposing the screw sticky material, the screw must be cooled.
3. Screw speed: The choice of screw speed has a direct impact on output and quality. The screw speed should be determined according to the size of the extruder and pipe diameter. The screw speed for extruding rigid PVC pipe is 7-30 rpm. Increasing the rotation speed can increase the output, but if simply increasing the rotation speed, the material will be poorly plasticized, the inner wall will be rough, and the strength of the pipe will decrease. Therefore, the screw speed should be matched with other extrusion conditions.
4. Traction speed: In normal production, the traction speed is 1% to 10% faster than the extrusion speed of the pipe to overcome the film expansion of the pipe. The traction speed should not be too fast or too slow. If it is too fast, the pipe is easy to bend and deform. Too slow, due to the expansion of the membrane, the pipe wall will be thickened.

5. Compressed air: Compressed air can shape the tube and maintain a certain roundness. Compressed air pressure usually needs to be stable to ensure that the pipe has a certain roundness; the pressure is suddenly large and small, and the pipe is prone to slub shape. The pressure is generally 0.02 to 0.05 MPa.

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  • PLASTIC BOARD/SHEET/FILM MACHINE
    • PVC WPC FOAM BOARD MACHINE
    • SPC FLOOR SHEET MACHINE
    • PVC WPC WALL PANEL MACHINE
    • LVT FLOORING MACHINE
    • PVC MARBLE SHEET MACHINE
    • PVC FREE FOAM BOARD MACHINE
    • PP HOLLOW BUILDING BOARD MACHINE
    • PVC RIGID SHEET MACHINE
    • PVC BAMBOO CARBON BOARD MACHINE
    • PS PP BLISTER SHEET MACHINE
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    • PE OCEAN PEDAL EXTRUSION MACHINE
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    • PVC HOLLOW FENCE BOARD PRODUCTION LINE
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    • GEOMEMBRANE WATERPROOF MEMBRANE PRODUCTION LINE
    • HIGH SPEED FILM BLOWING MACHINE
    • PVC WIDE WIDTH FLOOR LEATHER MACHINERY
    • PLASTIC CUSHION MAT(CARPET)EXTRUSION LINE
    • CAST FILM MACHINE
    • EPE FOAM SHEET(FILM) EXTRUSION LINE
    • PP/HIPS/PE/PET/EVA/EVAOH SHEET MACHINE
    • XPS FOAM BOARD MACHINE
    • XPE FOAM SHEET MACHINE
    • TPU FILM PRODUCTION LINE
  • PLASTIC PROFILE MACHINE
    • PE WPC OUTDOOR PRODUCT MACHINE
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    • PE MICRO FOAMING BEACH CHAIR MACHINE
    • PVC PRICE TAG MACHINE
    • PVC DOOR WINDOW PROFILE MACHINE
    • PVC OUTDOOR SIDING BOARD PRODUCTION LINE
    • PVC YIN YANG CORNER PRODUCTION LINE
    • PVC PU SIDELINE EXTRUSION MACHINE
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    • PLASTIC SEAL STRIP EXTRUSION LINE
    • PVC WINDOW SILL BOARD MACHINE
    • PVC HOSPITAL HANDRAIL MACHINE
    • PVC CHICKEN TROUGH MACHINE
    • PVC FOLDING DOOR MACHINE
    • PC PMMA PROFILE MACHINE
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  • PLASTIC PIPE MACHINE
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    • PVC PU STEEL WIRE REINFORCED HOSE MACHINE
    • PU SPIRAL STEEL WIRE REINFORCED PIPE MACHINE
    • PE PP PVC PA SINGLE-WALL CORRUGATED PIPE EXTRUSION LINE
    • LARGE DIAMETER(HDPE/MDPE)GAS/WATER SUPPLY PIPE PRODUCT LINE
    • U-PVC/C-PVC PIPE PRODUCTION LINE
    • LED LIGHT PC TUBE PRODUCTION LINE
    • MPP ELECTRIC PROTECTION PIPE MACHINE
    • PE LARGE CALIBER HOLLOW WALL WINDING PIPE PRODUCTION LINE
    • PVC PE POROUS PIPE PRODUCTION LINE
    • PE CARBON SPRING PIPE MACHINE
    • COD CABLE BUNDLE TUBE PRODUCTION LINE
    • PE SILICON CORE TUBE MACHINE
    • PPR PIPE EXTRUSION MACHINE
    • ALUMINUM-PLASTIC COMPOSITE PIPE PRODUCTION LINE
    • PEX/PERT HEAT-RESISTANT FLOOR HEATING PIPE MACHINE
    • PE PRESTRESSED CORRUGATED PIPE MACHINE
    • PVC TPU MECIAL TUBE EXTRUSION MACHINE
    • PE AERATION TUBE MACHINE
    • METAL PRESTRESSED CORRUGATED PIPE MACHINE
    • HDPE THREADING PIPE MACHINE
    • HDPE/PP/PVC DOUBLE WALL CORRUGATED PIPE MACHINE
    • PU TUBE MACHINE
    • PP 3LAYER CO EXTRUSION SILENT PIPE MACHINE
    • PVC REINFORCED PIPE EXTRUSION MACHINE
    • PLASTIC BAR ROD EXTRUSION MACHINE
    • PA NYLON TUBE MACHINE
    • ABS PIPE EXTRUSION MACHINE
  • PET PP PE STRAPPING BAND MACHINE
    • PE FIBER STRAPPING MACHINE
    • PET STRAPS PRODUCTION LINE
    • PP STRAPS BAND MACHINE
  • RECYCLED PLASTIC GRANULATION MACHINE
    • PVC PELLETISING MACHINE
    • PE PP PELLETISING MACHINE
    • PE PP WPC GRANULE MAKING MACHINE
  • THE POLYMER MATTRESS CUSHION PILLOW MACHINE
  • BIODEGRADABLE PLASTICS MACHINERY
  • PLASTIC EXTRUSION AUXILIARY MACHINE
  • PLASTIC EXTRUDER
  • LAMINATING AND HOT STAMPING MACHINE
  • BOARD PROFILE UV PAINTING MACHINE
  • PLASTIC MONOFILAMENT MACHINE
  • PLASTIC NET MACHINE
  • MELTBLOWN CLOTH MACHINE
  • PLASTIC PRODUCT
  • FACE MASK MACHINE
    • N95 KN95 FACE MASK MACHINE
    • FLAT FACE MASK MACHINE
    • MEDICAL MASK NOSE BRIDGE STRIP MACHINE

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