Operating Process of 5-Layer Stretch Film Making Machine
The 5-layer stretch film making machine (A-B-C-B-A configuration) is a high-speed co-extrusion system engineered for superior performance and stability. Utilizing three precision screws, this machine produces industrial-grade wrap with exceptional puncture resistance while maintaining a low-noise, energy-efficient production environment.
Technical Production Process
1. 3-Screw Raw Material Feeding (A-B-C Configuration)
The production starts with three independent extruders. This 3-screw setup optimizes material usage by feeding a 5-layer feedblock:
- Extruder A & B: Process the outer skin and sub-layers for stickiness and clarity.
- Extruder C: Processes the core layer to ensure maximum tear strength and structural integrity.
2. Independent Thermal Zone Control
Equipped with a high-precision heating system, each extruder manages independent temperature zones (ranging from 180°C to 250°C). This ensures optimal plasticization of LLDPE resins, preventing "fish eyes" and ensuring a stable, homogenous melt before co-extrusion.
3. 5-Layer Co-extrusion Feedblock & T-Die
The molten materials from the three screws are merged in a specialized 5-layer feedblock, creating an A-B-C-B-A structure. This multi-layer synergy produces a film that is thinner yet significantly tougher than conventional 3-layer films.
4. High-Speed Casting & Cooling
The film is cast onto a large-diameter chill roll. This process ensures instant quenching, which is critical for high optical clarity. The thickness tolerance is strictly maintained within ±1μm, ensuring uniform roll quality.
5. Precision Traction & Pre-stretch
The traction part utilizes high-speed rollers controlled by the PLC system. This section is engineered to provide high pre-stretch ratios (up to 400%), giving the film superior elastic memory and pallet-holding force.
6. Edge Trimming & Online Recycling
An integrated edge-trimming unit removes excess material, which is then captured and recycled online back into the extrusion process, minimizing material waste and reducing production costs.
7. PLC-Controlled Automatic Winding
The winding part is managed by a microcomputer programmable (PLC) controller with a user-friendly human-machine interface. This allows for dual-station automatic roll changing, ensuring 24/7 continuous operation without downtime.
Key Equipment Features
- Three-Screw Efficiency: High-performance extrusion with lower noise and stable running speeds.
- PLC Intelligent Control: Seamless operation through an advanced human-machine interface for precise winding and tension management.
- Material Savings: Advanced co-extrusion allows for film downgauging, reducing plastic consumption per pallet.
- Superior Load Security: The 5-layer ABCBA structure delivers exceptional puncture and tear resistance for irregular loads.
