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Polymer.
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Injection molding training for setters

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Part 1: Prevent processing problems

Getting to know the material plastic

  • Profile of the most important thermoplastics
  • Fundamentals of polymer chemistry
  • Differentiation of plastics
  • Nomenclature – recognize what you process

Material pretreatment

  • Incoming goods – optical quality control
  • Storage, packaging and labeling
  • Drying and residual moisture
  • How does moisture absorption work?
  • Blends (dryblend and compounds)

Effect of incorrect material pretreatment

  • practical examination in the test laboratory

Material properties and their units

  • Understanding material data sheets
  • Subdivision of properties
  • Explanation of units
  • Explanation of test methods
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Part 2: Systematic sampling

Theory unit

  • Cooperation with the tool shop
  • Basic setting of the machine according to data sheet
  • Overview of the most important parameters
  • Basic program for a new mold
  • Process sequence of an injection molding cycle
  • Checking the plastic melt
  • Swelling flow
  • Filling study
  • Holding pressure
  • Cavity pressure
  • Process optimization
  • Documentation of settings and parameters

Practice unit

  • Practical exercise on the injection molding machine
  • Application of the learned knowledge
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Part 3: Molding defects and optimization

Theory unit

  • Detect and classify
  • Cause: Tool or machine parameter?
  • Optimization possibilities
  • Interaction of individual parameters

The following error patterns are predominantly treated:

  • Sink marks
  • Blowholes/vacuoles
  • Streaks (moisture, air, combustion, glass fibers and paint streaks)
  • Free jet
  • Diesel effect/Burner
  • overspray/crater
  • Record effect
  • Warpage
  • Deformation due to demolding
  • Weld line
  • Gloss differences
  • White break
  • Stress cracks

Practice unit

  • Practical exercise on the injection molding machine
  • Determination of causes on the basis of case studies
  • Application of the acquired knowledge
Your trainer
Contact PersonChristian Schumacher
Head of education and training
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