Laser Cutting and Engraving Polyester | ULS

Polyesters are a class of polymers that include PET (polyethylene terephthalate), PET-G and Mylar®. Laser processing of polyesters can be performed with either a 9.3 or 10.6 micron CO2 laser. Polyesters do not readily absorb the energy from the 1.06 micron fiber laser and is not recommended for this material. Laser cutting of polyesters with a CO2 laser results in clean edges free of discoloration and limited melting. Laser engraving of polyesters with a CO2 laser results in depth, high contrast, and limited melt back at the point of ablation. Laser marking of polyesters with a CO2 is not recommend as the wavelength will not make a contrasting mark.

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Originally Posted by

Mylar is a trade name for PET film, sometimes referred to as polyester film - in case you want to source it out from plastic sheet suppliers. It is very dimensionally stable under thermo stresses compared to PETG or PC films. I cut it all the time, but only when its laminated to other polymers, and the PET layer cuts great.

I read some thread here a while back about cutting PET for solder masks for circuit boards, where they didn't want any hint of a lip on the melted edge (which you will get if too high power / slow speed). SO they rastered the tiny 1mm square openings instead of vector cut them, and the openings were perfectly cut - look up mylar circuit board and you will find the thread.

I always mask the PET prior to cutting (I use Flexmark - a 1mil poly film with light tack adhesive from Flexcon). The mask helps a lot.

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