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Blown Film

What is Blown Film Extrusion?

Process_Diagram-Blown_Film

  • Blown Film Extrusion is one of the most common polymer conversion processes in the world
  • Film is made by extruding molten plastic through a circular die, forming an inflated tubular bubble that moves through a cage as it cools, that is then collapsed and formed into rolls
  • The typical film blowing process consists of a series of stages, including extrusion, blowing, collapsing, and winding

HIPF Course Description

Course Objective

At the end of the course, the trainees will be able to:

  • Develop a working knowledge of and learn how to operate a Blown Film Extrusion machine
  • Understand the basics of blown film technology, the common material used, and some common problem solving situations
  • Analyze and solve practical blown film problems
  • Develop a working knowledge on maintaining a blown film machine

Course Outline

  1. Principles of Blown Film Extrusion
      Definition and Principle; Product and Applications; Film Fabrication Process; Types of Blown Film Machines
  2. Resin Materials for Blown Film
      Raw Materials Use for Blown Film Extrusion; Three Common Polyethylene Grades Used for Blown Film; Suitable Grade index for Blown Film
  3. Safety Education for Blown Film Operation
      Safety Guideline and SOP; Personal Protective Equipment (PPE); Safety Devices; Warning Signs; Safety Rules for Operation; Safety Instructions on Operation
  4. The Main Components of Blown Film Machine
      The Extruder; The Die Head and Die; The Bubble Cooling System; Bubble Stabilizer; The Take-Off System/Pinch or Nip Rolls; The Wind-Up System; Corona Treatment
  5. Die and Air Ring as Major Components for Blown Film
      Kinds of Die for Blown Film; Details of Die and How It Works; Details of Air Ring and How It Works; Die and Air Ring Care and Maintenance
  6. Introduction to the Blown Film Extrusion Machine
      BFE Process Flow; Start-Up of Blown Film Line; Quality Control for Blown Film; Scheduled Shut-Down of Blown Film Line; Emergency Shut-Down of Blown Film Line; Switching On After Emergency Stop
  7. Operating Skills for Blown Film Extrusion Technology
      Checking of Machine Conditions Before Operation; Winder Preparations; Film Guide Set-Up and Importance; Blown Film Run Preparations; Die Checking and Adjustments; Parameter Setting-Up; Switching On After Emergency Stop; Changing Die; Changing Materials and Filling Procedures
  8. Die Dismantling, Cleaning and Mounting
      Die Dismantling Procedure; Die Cleaning and Care; Understand Die Assembly and Mounting
  9. Blown Film Extrusion Troubleshooting
      Types of Trouble of Blown Film Process; Unstable Bubble; Film Appearance; Machine Malfunction
  10. Common Secondary Film Processing Methods
      Printing; Bag Making Process; Scrap Recycling
  11. Quality Control of Blown Film
      Quality Check for Blown Film; Production Recording; How To Report the Result of Manufacturing
  12. Practice Plant Operations