CO2 laser ablative etching of polyethylene terephthalate

Effect of biaxial‐simultaneous stretching conditions on OTR and CO2 permeation of CO2 laser perforated poly(lactic acid) film

“…. There are several studies in the literature addressing a study of lasers interacting with polymer materials . However, only a few works reported the production of a breathable packaging film by laser .…”

Excimer laser polymer ablation: the first 20 years

“…In this picture bond breaking will occur principally from the ground electronic state of the molecule. That a purely thermal process can produce effective polymer ablation has been confirmed by a number of investigations using long wavelength pulsed CO 2 lasers, where the photons coupled to vibrational modes of the molecule [14,15]. The general findings (threshold behaviour, dependence on absorption coefficient) mirror quite closely those for excimer lasers when account is taken of the generally lower absorption coefficients for vibrational transitions.…”

Ablation of organic polymers by tea CO2 laser.

“…The etch rate model was improved by taking into account the existence of the threshold fluence and optical reabsorption by the ablation plume in the laser pulse duration [7]. Since the onset of the polymer ablation by the pulsed C02 laser was reported to exist within the incident pulse duration [4], the etch rate model is applicable to the TEA C02 laser ablation of the PEEK film and the required laser energy density for the decomposed unit volume of the polymer appears to be constant. As assumed by the etch rate model, the linearity of the etch rate to the fluence also implies that the ablation plume does not absorb the laser energy.…”

“…Based on the linear etch rate model mentioned above, the decrease of the slope means that the ablated fragments re-absorb the laser energy within the pulse duration and/or the number density of decomposed bondings increases as the laser fluence is increased. Dyer et al reported that light weight fragments are increased as the fluence is increased in the polyethylene telephthalate (PET) ablation with pulsed C O2 laser [4].…”

“…Since photothermal reactions in the excimer laser ablation were pointed out [1,2], the organic polymer ablations were carried out using an oscillation line of selected pulsed C02 lasers which could effectively excite vibrational-rotational states of the polymers [3][4][5] .The success of these ablations was demonstrated by taking advantage of the TEA C02 laser wavelength selectivity between 9 ,am and 11 µm.…”