A4 Conference proceedings

A Study on Usage of on-site Multi-monitoring System in Laser Processing of Paper Materials


Open Access publication

LUT Authors / Editors

Publication Details
Authors: Piili Heidi
Publication year: 2015
Language: English
Related Journal or Series Information: Physics Procedia
Title of parent publication: 15th Nordic Laser Materials Processing Conference, Nolamp 15
Volume number: 78
Start page: 147
End page: 156
JUFO-Level of this publication: 1
Open Access: Open Access publication

Abstract
Laser technology provides advantages for paper material processing as it is non-contact method and provides freedom of geometryand reliable technology for non-stop production. Reason for low utilization of lasers in paper manufacturing is lack of publishedresearch. This is main reason to study utilization of on-site multi-monitoring system (MMS) in characterization of interactionbetween laser beam and paper materials. Target of MMS is to be able to control processing of paper, but also to get betterunderstanding of basic phenomena.Laser equipment used was TRUMPF TLF 2700 CO2 laser (wavelength 10.6 μm) with power range of 190-2500 W. MMS consistedof spectrometer, pyrometer and active illumination imaging system. This on-site study was carried out by treating dried kraft pulp(grammage of 67 g m-2) with different laser power levels, focal plane position settings and interaction times.It was concluded that spectrometer and pyrometer are best devices in MMS; set-up of them to laser process is easy, they detect datafast enough and analysis of data is easy afterwards. Active illumination imaging system is capable for capturing images of differentphases of interaction but analysis of images is time-consuming. When active illumination imaging system is combined withspectrometer and pyrometer i.e. using of MMS, it reveals basic phenomena occurring during interaction. For example, it wasnoticed that holes created after laser exposure are formed gradually. Firstly, small hole is formed to interaction area and after thathole expands, until interaction is ended.

Last updated on 2017-22-03 at 13:53