How to Choose the Right Blown Film Machine: Single Screw vs Double Screw vs 3-Layer Co-Extrusion

Choosing the right blown film machine is one of the most important decisions for film manufacturers.
The machine structure directly affects film quality, material cost, production efficiency, and long-term profitability.

In this article, we explain the differences between single screw, double screw (double-layer co-extrusion),
and 3-layer co-extrusion blown film machines to help you choose the right solution for your production needs.

1. Single Screw Blown Film Machine

Best for virgin material and transparent film production.
A single screw blown film machine is simple, stable, and easy to operate.
It provides excellent film clarity when using virgin materials and has low maintenance costs.

Typical applications include transparent packaging bags, inner liners, and lightweight films.
However, it is less suitable for high recycled material ratios and high-strength film requirements.

2. Double Screw (Double-Layer Co-Extrusion) Blown Film Machine

Designed for better cost control and material flexibility.
Double screw machines allow the use of mixed virgin and recycled materials,
while maintaining better stiffness compared to single screw machines.

They are widely used for LDPE and HDPE films, daily packaging bags,
and cost-sensitive film products.

3. 3-Layer Co-Extrusion Blown Film Machine

Designed for high-quality and high-performance films.
Each layer can serve a different function, such as strength, appearance, or cost control.

This machine offers excellent film strength, high gloss, and stable quality.
Typical applications include courier bags, high-quality packaging films, and agricultural films.

How to Choose the Right Blown Film Machine

When selecting a blown film machine, consider raw material type,
film application, cost structure, and future expansion plans.

Do not choose based on price alone.
Choose a machine that fits your long-term production strategy.

With over 40 years of experience in plastic machinery manufacturing,
we help customers select the right blown film solution.