3-Layer Stretch Film Machine

The 3-layer stretch film machine is designed to deliver an optimal balance between mechanical performance and material efficiency. Using advanced ABC three-layer co-extrusion technology, it produces a composite film structure consisting of an outer strength layer, a middle toughening or recycled layer, and an inner cling layer. Compared with traditional 2-layer films, this structure significantly enhances overall performance, improving puncture resistance by 30–50% at the same thickness, achieving a stretch ratio of over 350%, and reducing raw material costs by approximately 15–20%.

The machine operates through a coordinated three-extruder system, where each extruder processes different resin formulations such as LLDPE, LDPE, metallocene materials, or recycled content. Extruder A typically forms the outer strength layer to provide durability, Extruder B produces the middle layer for toughness or cost optimization, and Extruder C creates the inner cling layer for reliable adhesion. Each extrusion unit independently controls temperature, typically within a range of 180–240°C, ensuring precise melting and stable material flow. The molten resins are then combined in a three-layer distributor and flat T-die to form a uniform ABC film structure.

After extrusion, the film is rapidly cooled on a large-diameter chill roll, which ensures excellent transparency and maintains thickness uniformity within tight tolerances. A closed-loop thickness control system, using X-ray or infrared sensors, continuously monitors the film gauge and automatically adjusts die gaps and extrusion output in real time. The film then passes through a traction and stretching system, where controlled speed ratios impart pre-stretch capability of up to 350%, enhancing its performance during application. Edge trimming units remove excess material for inline recycling, while an automatic winding system enables continuous, high-efficiency production with stable roll quality.

With its enhanced strength, superior stretchability, and optimized material usage, the 3-layer stretch film machine is widely used in industrial logistics, building materials packaging, and heavy-duty pallet wrapping. It provides a reliable and efficient solution for manufacturers seeking improved film performance while maintaining cost control.

Quick Comparison: 2-Layer vs 3-Layer Stretch Film