Two Layer HM Blown Film Plant

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A two-layer HM (High Molecular Weight) blown film plant is a production system that extrudes and blows molten polymer materials, typically HDPE (High-Density Polyethylene) or LDPE (Low-Density Polyethylene), to create two-layer films for various applications like packaging, agriculture, and industry. 

Here's a more detailed description:

What it is:

  • Purpose:

    The plant's primary function is to produce two-layer blown films, which are films created by extruding molten plastic through a die and then inflating the extruded tube with air to form a bubble-like structure, which is then cooled and drawn into a flat film. 

  • Materials:

    It utilizes polymers like HDPE, LDPE, LLDPE (Linear Low-Density Polyethylene), or PP (Polypropylene). 

  • Applications:

    The resulting films find use in packaging (bags, shopping bags, food packaging), agriculture (mulch films), and industrial applications. 

How it works:

  • Extrusion: Molten polymer is extruded through a circular die, forming a tube. 
  • Inflation: Air is blown into the tube, expanding it into a bubble. 
  • Cooling and Drawing: The bubble is cooled and drawn into a flat film. 
  • Two-Layer Structure: The plant is designed to simultaneously extrude two layers of molten polymer, which adhere together to form a two-layer film. 

Key Features:

  • Screw Diameter:

    The screw diameter (e.g., 35mm, 45mm, 55mm) affects the production capacity and film thickness. 

  • Production Capacity:

    The plant can produce films with varying thicknesses and layflat widths (e.g., 200 to 1200mm). 

  • Screw Type:

    Different screw types (e.g., barrier screw, grooved feed) can be used depending on the polymer and desired film properties. 

  • Die Type:

    The die design (e.g., ABA die) influences the film structure and properties. 

  • Automation:

    Some plants are semi-automatic or fully automatic, with features like PLC control for precise process management.