Resources

Additional references and resources for micro molding design.

Industry Standards

Plastics Industry Standards

  • SPI/Plastics Industry Association — Standards and Practices of Plastics Molders
  • AQ-102 — Molding tolerances for plastic materials

Medical Device Regulations

  • FDA 21 CFR Part 820 — Quality System Regulation
  • ISO 13485 — Medical devices quality management systems
  • ISO 10993 — Biological evaluation of medical devices
  • ISO 14644-1 — Cleanroom classification standards
  • ISO 14698 — Cleanroom microbial monitoring
  • USP Class VI — Biocompatibility testing for plastics

General Manufacturing

  • ISO 9001 — Quality management systems
  • IATF 16949 — Automotive quality management
  • ISO 14971 — Medical device risk management

Material Resources

Material Databases

  • Material supplier technical data sheets
  • UL Prospector (material property database)
  • CAMPUS (plastics material database)

Common Material Suppliers

MaterialMajor Suppliers
PEEKVictrex, Solvay, Evonik
LCPCelanese (Vectra), Polyplastics
PEI (Ultem)SABIC
PPSCelanese (Fortron), Solvay (Ryton)
COC/COPTOPAS, Zeon
Engineering plasticsBASF, DuPont, Covestro, SABIC
Medical SiliconeDuPont Liveo, Momentive

Micro Molding Equipment

Machine Manufacturers

ManufacturerNotable Systems
Arburg8mm micro injection unit
Wittmann BattenfeldMicroPower series
Sumitomo DemagSE7M series
BoyXS series
SodickMicro molding systems
NisseiMicro injection machines

Design Software

Flow Simulation

  • Moldflow (Autodesk)
  • Moldex3D (CoreTech)
  • Sigmasoft (Sigma Engineering)

CAD Systems

Ensure your CAD system can handle:

  • Micro-scale features accurately
  • Appropriate file tolerances for micro dimensions
  • Export formats compatible with mold maker’s systems

Measurement Equipment Suppliers

TechnologySuppliers
CMM / Micro-CMMZeiss, Hexagon, Mitutoyo
Vision systemsKeyence, OGP, Nikon
White light interferometryZygo, Bruker
CT scanningZeiss, GE, Nikon
ProfilometryMitutoyo, Taylor Hobson
Confocal microscopyOlympus, Leica

Glossary

TermDefinition
Aspect ratioRatio of feature height to width
CavityThe female portion of mold forming external part surfaces
Conformal coolingCooling channels that follow part contours
CoreThe male portion of mold forming internal part surfaces
CpkProcess capability index accounting for centering
DfMMDesign for Micro Molding
DLCDiamond-Like Carbon (mold coating)
DOEDesign of Experiments
Draft angleTaper on vertical walls to aid ejection
EDMElectrical Discharge Machining (mold making process)
FlashExcess material at parting line
Gage R&RMeasurement system repeatability and reproducibility
GateOpening where material enters the cavity
GD&TGeometric Dimensioning and Tolerancing
Hesitation effectFlow delay at micro feature entrances
IQ/OQ/PQInstallation/Operational/Performance Qualification
LCPLiquid Crystal Polymer
Meld lineWhere flow fronts meet at an angle
Parting lineWhere mold halves meet
PEEKPolyether Ether Ketone
PEIPolyetherimide
RunnerChannel delivering material from sprue to gate
Shear thinningViscosity reduction under high shear rates
Short shotIncomplete filling of cavity
Sink markSurface depression from shrinkage
SPCStatistical Process Control
SprueChannel from nozzle to runner system
UndercutFeature preventing straight-pull ejection
VariothermRapid mold temperature cycling
Weld lineWhere flow fronts meet head-on

Contact

For questions about this design guide or micro molding capabilities, contact Future Micro.


References

This design guide was compiled from authoritative industry and academic sources:

Academic & Research Publications

  1. A Review of Microinjection Moulding of Polymeric Micro Devices — PMC/MDPI
  2. The Micro Injection Moulding Process for Polymeric Components Manufacturing — IntechOpen
  3. Micro-injection moulding of polymer microfluidic devices — Microfluidics and Nanofluidics, Springer
  4. Effects of Cavity Thickness and Mold Surface Roughness on Polymer Flow During Micro Injection Molding — PMC
  5. Advanced Injection Molding Methods: Review — Materials, MDPI
  6. Modelling and Simulation for Micro Injection Molding Process — IntechOpen
  7. Recent Advances in Microinjection Molding of Polymer Materials for Biomedical Applications — Advanced Engineering Materials, Wiley
  8. A Review on Microcellular Injection Moulding — PMC/MDPI
  9. Microcellular injection molding of polymers: a review — Current Opinion in Solid State and Materials Science
  10. Micro-nanostructured polymer surfaces using injection molding: A review — ScienceDirect
  11. Microinjection molding of thermoplastic polymers: A review — Journal of Micromechanics and Microengineering
  12. Study of rheological behaviour of polymer melt in micro injection moulding — Polymer Testing
  13. Optimizing process parameters in micro injection moulding — ScienceDirect
  14. Multi-Objective Optimizations for Microinjection Molding Process Parameters of Biodegradable Polymer Stent — Materials, MDPI
  15. Study on the Effect of Processing Parameters on Residual Stresses of Injection Molded Micro-Pillar Array — PMC
  16. Fundamentals of rapid injection molding for microfluidic cell-based assays — Lab on a Chip, RSC
  17. Fabrication Methods for Microfluidic Devices: An Overview — Micromachines, MDPI
  18. Mechanical properties of the weld line defect in micro injection molding for nano filled polypropylene composites — Journal of Alloys and Compounds
  19. Replica Molding of High-Aspect-Ratio Polymeric Nanopillar Arrays — Langmuir, ACS
  20. High-aspect-ratio nanoimprint process chains — Microsystems & Nanoengineering
  21. Replication integrity of micro features using variotherm and vacuum assisted microinjection moulding — ScienceDirect
  22. Injection molding of high-precision optical lenses: A review — ScienceDirect
  23. New Considerations on the Determination of the Apparent Shear Viscosity of Polymer Melt with Micro Capillary Dies — Polymers, MDPI
  24. Rheological behavior of POM polymer melt flowing through micro-channels — European Polymer Journal
  25. Polymer Crystallization Under High Cooling Rate and Pressure — Springer
  26. Effects of Pressure and Cooling Rates on Crystallization Behavior of Isotactic Polypropylene — Polymers, MDPI
  27. Analysis of the Similarity between Injection Molding Simulation and Experiment — PMC
  28. Development of the vent clogging monitoring methods for injection molding — ScienceDirect

Industry Technical Resources

  1. Accumold — Micro Molding Design Guidelines
  2. Accumold — Design for Micro Molding
  3. Accumold — Micro Molder Requirements
  4. Accumold — Medical Micro Molding
  5. Accumold — Micro Optics Molding
  6. MTD Micro Molding — Micro Materials
  7. MTD Micro Molding — Micro Metrology
  8. MTD Micro Molding — How Thin Can We Go?
  9. Isometric Micro Molding — Thin-Walled Micro Injection Molding
  10. Isometric Micro Molding — CT Scanning
  11. Medical Micro Molding — Process Validation Protocols
  12. Medical Micro Molding — ISO 13485 Requirements
  13. Medical Micro Molding — PEEK for Medical Uses
  14. Medical Micro Molding — Materials: PEEK, LCP & Biodegradable Polymers
  15. Protolabs — Injection Molding Tolerances
  16. Protolabs — Draft Angle Guidelines
  17. Protolabs — Wall Thickness Guidelines
  18. Manufacturing Tomorrow — Tolerance Attainment in Micro Molding
  19. Manufacturing Tomorrow — Design Guidelines for Micro Molding
  20. Med-Tech Insights — Design Guidelines for Micromoulding
  21. Plastics Today — More to Micro Molding than Part Size
  22. Plastics Technology — Micromolding Sizing Up the Challenges
  23. Plastics Technology — Molding Simulation: New Frontiers
  24. Plastics Technology — Faster Is Not Always Better
  25. Plastics Technology — Vacuum Venting Keeps Molds Running Longer
  26. MoldMaking Technology — Diamond-Like Carbon Mold Coatings
  27. MoldMaking Technology — A Different Approach to Mold Venting
  28. Machine Design — CT vs CMM Comparison
  29. Makino — Micromachining Technologies
  30. EDM Intelligent Solutions — Micro Manufacturing
  31. Arburg — Micro Injection Moulding
  32. Sumitomo Demag — SE7M Micro Injection Molding Machines
  33. Moldex3D — Flow Simulation
  34. Xometry — Conformal Cooling
  35. 3D Systems — Conformal Cooling
  36. Ensinger — Micro Injection Moulding with High Performance Polymers

Standards & Regulatory Guidance

  1. FDA 21 CFR Part 820 — Quality System Regulation
  2. ISO 13485:2016 — Medical Devices Quality Management
  3. ISO 10993 — Biological Evaluation of Medical Devices
  4. USP Class VI Testing Requirements