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A New Processing Method for Laser Sintering Polymer Powders at Low Bed Temperatures.

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A novel anchor film prevents part distortion in laser sintering (LS) of high-melting polymers like polyethylene terephthalate (PET) at lower bed temperatures. This innovation enables successful printing of PET at 150 °C, reducing curl and warpage.

Keywords:
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Area of Science:

  • Additive Manufacturing
  • Materials Science

Background:

  • Current laser sintering (LS) machines are limited to 200 °C bed temperatures, restricting the use of high-melting polymers like polyethylene terephthalate (PET).
  • Low bed temperatures in LS cause significant part distortion (curl and warpage) due to crystallization-induced shrinkage.

Purpose of the Study:

  • To introduce a new method for laser sintering (LS) high-melting polymers at reduced bed temperatures.
  • To overcome part distortion issues in LS using an in situ printed anchor film.

Main Methods:

  • Developed a flexible, ~70 μm thick anchor film printed in situ.
  • Utilized the anchor film to provide frictional restraint, preventing curl and warpage during LS.
  • Successfully printed polyethylene terephthalate (PET) and polyamide 12 (PA12) at significantly lowered bed temperatures.

Main Results:

  • Achieved successful printing of PET parts at 150 °C, an 80 °C reduction from standard processes, without machine stoppage.
  • The in situ anchor film effectively mitigated curl and warpage, issues typically encountered at low bed temperatures.
  • Demonstrated potential benefits for polyamide 12 (PA12) printing, including reduced powder degradation and energy consumption.

Conclusions:

  • The in situ printed anchor film is an effective solution for enabling low-temperature laser sintering (LS) of challenging polymers like PET.
  • This method offers a significant advancement over traditional methods, using a thin, detachable film instead of bulky anchoring sheets.
  • The technique holds promise for broader applications in additive manufacturing, improving material processing and energy efficiency.