ALLIED COMPANIES
What is Extrusion Blow Molding?



Extrusion Blow Molding produces hollow shaped articles, with the following steps:
  • Resin is heated and plasticized by an extruder
  • The molten resin is extruded so that it forms a tube-shaped parison matching the size of the product using the die
  • The Parison is enclosed by the mold halves and the bottom is squeezed during pinch-off stage
  • Air is then forced into the parison and presses it against the inner walls of the mold
  • The product cools down and becomes solid in the mold, the air pressure is released
  • The mold is opened and the product is transferred to post cooling and deflashing unit then taken-out by article discharge
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 blow molding technology, plastics behavior and common problem solving situations
  • The ability to recognize processing conditions that affect quality
  • The ability to analyze and solve practical blow molding problems
  • Learned and understood safety practices in the workplace
Course Outline
  1. Introduction to Blow Molding

    2. Molding Methods and Industry Size; Principles of Blow Molding; Types of Blow Molding; Advantages; History; Applications; Materials; Molds; Parts and Functions; Process and Operation

  2. Blow Molding Operation Safety Practices

    3. Workshop Safety Practices; Proper Clothing At Work; Safety Devices; Warning Signs; Sources of Danger; Safety Instructions

  3. The Extrusion Blow Molding Machine

    4. The Extrusion Blow Molding Process; Machine and Equipment Parts, Functions and Specifications; Blow Molds; 5-Media Used in Blow Molding

  4. Mold and Machine Maintenance

    5. Mold Maintenance; Machine Maintenance; Machine Daily Inspection List; Care and Maintenance Schedule; Cleaning the Scrap Mill

  5. Extrusion Blow Molding Machine Operation

    6. Blow Molding Machine Start-up Procedure; Shutdown Procedure; Mold Change-over and Set-up Procedure; Changing Die/Tools; Changing Materials and Masterbatch; Purging the Extruder

  6. Machine and Blow Molding Process Troubleshooting

    7. Parison Defects; Appearance Defects; Container Performance Defects; General Machine Malfunctions

  7. Product Quality Testing

    8. Quality and Quality Control – Definition; Classes of Product Defects; Laboratory Tests and Quality Control Test Methods; Product Quality Evaluation

  8. Practice Training

    9. Orientation on Workshop Facilities and Safety Equipment; Familiarization on Parts and Functions of Machines and Equipment; Machine Operation Demonstration by Senior Instructor; Starting and Shutting Down Machine by Trainees; Machine Parameters Setting; Parison Adjustment and Optimization; Blow Pin Adjustment

    Deflasher and Article Transfer Adjustment; Product Sampling and Evaluation; Mold and Toolings Change-over and Set-up; Process and Machine Trouble Shooting; Raw Material Preparation; Changing Materials and Masterbatch; Purging the Extruder; Scrap Mill Operation and Recycling

Extrusion Blow Molding Workshop Gallery