What is Blown Film Extrusion?

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
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Principles of Blown Film Extrusion
Definition and Principle; Product and Applications; Film Fabrication Process; Types of Blown Film Machines
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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
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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
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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
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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
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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
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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
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Die Dismantling, Cleaning and Mounting
Die Dismantling Procedure; Die Cleaning and Care; Understand Die Assembly and Mounting
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Blown Film Extrusion Troubleshooting
Types of Trouble of Blown Film Process; Unstable Bubble; Film Appearance; Machine Malfunction
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Common Secondary Film Processing Methods
Printing; Bag Making Process; Scrap Recycling
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Quality Control of Blown Film
Quality Check for Blown Film; Production Recording; How To Report the Result of Manufacturing
- Practice Plant Operations
