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

The biaxially oriented poly(lactic acid) films prepared using simultaneous biaxial stretching were perforated by CO2 laser with the power of 60 W. The focal spot diameter was fixed at 103 μm. Pulse durations were varied from 1 to 30 μs, which corresponds to the fluence from 1.4 to 42.6 J/cm2. The pe...

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Veröffentlicht in:Packaging technology & science 2018-08, Vol.31 (8), p.545-556
Hauptverfasser: Winotapun, Charinee, Kerddonfag, Noppadon, Daud, Witchuda, Chinsirikul, Wannee, Takarada, Wataru, Kikutani, Takeshi
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container_issue 8
container_start_page 545
container_title Packaging technology & science
container_volume 31
creator Winotapun, Charinee
Kerddonfag, Noppadon
Daud, Witchuda
Chinsirikul, Wannee
Takarada, Wataru
Kikutani, Takeshi
description The biaxially oriented poly(lactic acid) films prepared using simultaneous biaxial stretching were perforated by CO2 laser with the power of 60 W. The focal spot diameter was fixed at 103 μm. Pulse durations were varied from 1 to 30 μs, which corresponds to the fluence from 1.4 to 42.6 J/cm2. The perforated microhole size increased with increasing laser energy. The shape of microholes was circular for the films of equi‐biaxial stretching, whereas elliptical microholes were formed with its long and short axes corresponding to the directions of higher and lower stretch ratios, respectively. Comparing the laser perforation behavior of the as‐drawn films and annealed films, the opening of a microhole in the annealed films started at higher laser fluence, and at the same fluence the size of microhole was smaller. Gas transmission rates of the biaxially oriented poly(lactic acid) films with different thicknesses were examined. The oxygen transmission rates (OTR) of film improved with increased microhole diameter. The OTR of films containing 1 microhole/103 cm2 (hole diameter of ~110 μm) was 184, 150, and 98 cm3/d in comparison with the OTR for the original films without microhole of only 16, 10, and 8 cm3/d, respectively. Packaging films with OTR higher than 100 cm3/d (equivalent to the 9700 cm3/m2/d) are required to create a modified atmosphere inside the package of fresh produce for shelf‐life extension. Measured OTR and CO2TR values of the 3 different shapes of microhole were compared and discussed. The biaxially oriented poly(lactic acid) films prepared using simultaneous biaxial stretching were perforated by CO2 laser. The formation of circular or elliptical microhole was found to depend on the difference of stretch ratio of film in machine and transverse directions. Measuring the OTR and CO2TR values of the different hole shapes on film, hole area is the key important parameter affecting gas transmission through the microhole. Gas transmission rates of films with different thicknesses were also examined.
doi_str_mv 10.1002/pts.2381
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The OTR of films containing 1 microhole/103 cm2 (hole diameter of ~110 μm) was 184, 150, and 98 cm3/d in comparison with the OTR for the original films without microhole of only 16, 10, and 8 cm3/d, respectively. Packaging films with OTR higher than 100 cm3/d (equivalent to the 9700 cm3/m2/d) are required to create a modified atmosphere inside the package of fresh produce for shelf‐life extension. Measured OTR and CO2TR values of the 3 different shapes of microhole were compared and discussed. The biaxially oriented poly(lactic acid) films prepared using simultaneous biaxial stretching were perforated by CO2 laser. The formation of circular or elliptical microhole was found to depend on the difference of stretch ratio of film in machine and transverse directions. Measuring the OTR and CO2TR values of the different hole shapes on film, hole area is the key important parameter affecting gas transmission through the microhole. 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source Wiley Online Library Journals Frontfile Complete
subjects Annealing
biaxially oriented films
Carbon dioxide
Carbon dioxide lasers
Fluence
Gas transmission
laser perforation
Lasers
Life extension
Microholes
modified atmosphere packaging
Perforation
poly(lactic acid)
Polylactic acid
Stretching
title Effect of biaxial‐simultaneous stretching conditions on OTR and CO2 permeation of CO2 laser perforated poly(lactic acid) film
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