The PET sheet extrusion process in TZ-machinery utilizes a specialized design that eliminates the need for traditional crystallization and drying steps, while incorporating advanced features for efficiency and automation. Here’s a detailed breakdown of your process:
Raw Material Feeding:
Virgin PET flakes/chips are directly fed into the extruder hopper without pre-crystallization or drying, thanks to your system’s unique design.
Melting & Plasticizing:
Planetary Gear Extruder System:
– This PET Sheet Production line employs a ‘multi-screw planetary gear design’ (surrounding a central main screw) for superior melting and mixing.
– This design enhances heat transfer, reduces shear stress, and ensures uniform melt consistency.
– Vacuum degassing: Volatiles and moisture are removed via vacuum vents during extrusion, eliminating the need for pre-drying and pre-crystallizing
Filtration & Metering:
– Melt passes through a ‘screen changer’ to filter impurities.
– A ‘gear pump’ maintains precise pressure and flow rate for consistent thickness.
Sheet Formation:
– Melt is extruded through a ‘Jctimes extrusion die’ to form a continuous sheet.
– Roller Calendering: The molten PET is cooled and shaped by a precision 3-roll stack (vertical or horizontal) to achieve the desired thickness and surface finish.
Cooling & Surface Treatment:
– Chill Rolls: The sheet is cooled gradually to ensure dimensional stability.
– Oil Coating: A thin layer of oil is applied to improve surface smoothness and prevent static.
– Heating Oven (Optional): Some lines may include an oven for annealing or further thermal treatment to enhance mechanical properties.
Automated Winding:
– Fully Automatic Winders:
– Auto-Length Counting: The system measures and cuts sheets at preset lengths.
– Auto-Cutting & Splicing: Seamless transition between rolls without stopping production.
– Core Loading/Ejection: Automated roll handling fo
TZ-machinery Planetary Multi-screw PET sheet production Line:
Model Of Planetary Muilt-screw PET sheet Extrusion Machine:
| Model | Applicable Material | Screw Combination | Screw Size | Sheet Thickness (mm) | Sheet Width | Max. Extrusion Volume (kg/h) |
| TZ-120X | PET | Single screw & Planetary multi-scrwe | Φ120 | 0.15-1.6 | ≦800 | 400-600 |
| TZ-130X | PET | Φ130 | 0.15-1.6 | ≦800 | 600-900 | |
| TZ-150X | PET | Φ150 | 0.15-1.6 | ≦800 | 1000-1500 |