3 Layer Stretch Film Making Machine: Core Technology Analysis and Industry Application Guide
Release time:
2025-03-11 17:28
The 3 layer stretch film making machine is a core model in the field of plastic packaging equipment, realizing the continuous production of high-strength, highly ductile films by means of multi-layer co-extrusion blown film technology. With the growing demand for functional films in the global logistics and agricultural sectors, the advantages of this machine in reducing packaging costs and improving material utilization are becoming increasingly prominent. This article will provide readers with a comprehensive analysis of the technical principles, production processes and industry applications.
First, the core technical advantages of 3 layer stretch film making machine
1. Multi-layer co-extrusion blown film technology
Three-channel extrusion system: adopting independent screw to control the raw materials of outer layer (wear-resistant layer), middle layer (barrier layer) and inner layer (heat sealing layer), and accurately adjusting the ratio of melt index (MI) and layer thickness.
Intelligent temperature control module: Segmented heating (180-250°C) ensures consistent material fluidity in all layers, avoiding interface delamination or air bubble defects.
Synchronized stretching process: Bi-directional stretching ratio (4:1 longitudinal, 3:1 transverse) enhances film puncture resistance, which is suitable for downstream high-speed slitting of stretch film rewinders.
2. Energy saving and automation design
Frequency conversion drive system: reduces energy consumption by 15-20%, supports 0.005mm thickness error control, and reduces raw material waste.
Waste material recycling system: Recycling of trimmings through on-line plastic granulator machine, realizing 99% raw material utilization rate.
Second, the production process and equipment selection guide
1. Core production link
Ratio of raw materials: LLDPE (tear-resistant) is used for the outer layer, PA (oxygen barrier) for the middle layer, and mLLDPE (low-temperature heat sealing) for the inner layer.
Co-extrusion blown film molding: three extruders synchronously convey the melt, blowing and expanding into film bubbles through the ring die, cooling and shaping after winding.
Post-processing: slit into customized width by stretch film rewinder to meet the end packaging requirements.
2. Selection of key parameters
Capacity matching: select line speed (50-150m/min) according to film width (800-3000mm) and thickness (0.008-0.05mm).
Function expandability: support the addition of anti-UV, anti-fog droplet and other functional masterbatch to expand the application scenarios such as agricultural greenhouse film.
Manufacturer qualification: Refer to the certification standard of China Machinery Industry Association, prefer suppliers with ISO 14001 environmental protection certification.
Industry application and technological innovation
1. Mainstream application scenarios
Industrial packaging: 3-layer co-extruded film is used for pallet wrapping, with tensile strength ≥25MPa, reducing logistics and transportation loss by 30%.
Agricultural film: the middle EVA barrier layer reduces UV penetration and extends the service life of greenhouses to more than 5 years.
Electronic protection: the inner conductive material prevents static adsorption and protects precision components.
2. Future technology trends
AI process optimization: Predict the melt flow state through machine learning and adjust the screw speed and temperature parameters in real time.
Bio-based materials: Develop PLA/starch composite layer to reduce the amount of petroleum-based plastics by 30%.
IoT Integration: Access to the cloud management system of Brückner Group in Germany, realizing global factory equipment status monitoring.
With multi-layer co-extrusion technology and intelligent design, Wintech 3 layer stretch film making machine is promoting the packaging industry to transform to high strength and environmental protection. Enterprises need to combine the characteristics of raw materials and end-use demand, choose the appropriate plastic granulator and stretch film rewinding machine co-production, while focusing on bio-based materials and AI technological innovation, in order to seize the first opportunity in the global market.
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