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TOC

1.General information
Foreword
Description
Compositions
Safety precautions to observe when moulding
ELRIN acetal resins
Packaging
Recyclability of packaging waste

2.Polymer structure and processing behaviour
Glass transition and melting
PVT diagrams
Heating-cooling behaviour
Viscosity and rheological behaviour

3.Injection moulding unit
Screw design
Cylinder temperature control
Cylinder adaptor
Non-return valve (Back Flow Valve ñ BFV)
Nozzle
Evaluation of melt quality

4.Moulds
Ability to fill
Gates
Runner system
Nozzle and sprue
Hot runner mould for crystalline polymers
Vents
Undercuts
Sharp corners
Ribs design
Weld lines
Mould maintenance
Mould cleaning

5.Moulding process
Start-up and shutdown procedures
Operating conditions for DELRIN
ñ temperature settings
Operating conditions for DELRIN
ñ moulding cycle
Optimum productivity moulding
Standard moulding conditions
for ISO tensile bars
Appendix:Hold Pressure Time via in-cavity
pressure measurement

6.Dimensional considerations
Mould shrinkage
Factors affecting mould shrinkage
Mould shrinkage of filled resins
Effect of pigments
Post-moulding shrinkage
Insert moulding
Annealing
Environmental changes
Dimensional tolerances

7.Auxiliary operations
Material handling
Drying
Reground resin
Colouring
Disposal

8.Troubleshooting guide
Simulated computer screens from CAMDO

9.Index
Insert: Processing data

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