In film production machines such as 3-layer stretch film machines, 5-layer stretch film machines, and 7-layer bubble film machines, the barrel and screw assembly is a key component of the extrusion system. It is responsible for conveying raw polymer materials, melting and plasticizing them, and generating the pressure required for continuous film extrusion. A thick-walled barrel and precision screw design provides the strength and stability needed for reliable operation.
The thick-walled barrel is manufactured from high-strength alloy steel and treated with specialized hardening processes. This structure improves resistance to high pressure, high temperature, and mechanical wear during long production cycles. The reinforced barrel helps maintain accurate internal dimensions, ensuring stable material conveying and consistent heat transfer during extrusion.
The screw is designed with optimized geometry to support efficient plasticization and smooth melt flow. As the screw rotates, polymer pellets are gradually conveyed, compressed, and melted inside the barrel. Multi-zone temperature control along the barrel allows the material to transform from solid pellets into a uniform molten state under controlled thermal conditions.
This design is especially important in multi-layer film production, where different polymer materials must be processed consistently before forming the final film structure. Stable melt flow and pressure help ensure uniform layer distribution and consistent film quality.
Together, the thick-walled barrel and precision screw design maintain stable extrusion pressure, uniform melt quality, and consistent film thickness. This supports the reliable production of stretch film and bubble film with stable structure, good mechanical strength, and uniform performance.
