Banner for LabNotes
From Lab Notes
Contact Information
Forest Products Laboratory
One Gifford Pinchot Drive
Madison, WI 53726-2398
Phone: (608) 231-9200
Fax: (608) 231-9592
Email

 

You are here: FPL Home  / Information Products & Services  / Publications

Requested Product

Title: Predicting photoyellowing behaviour of mechanical pulp containing papers

Source: Proceedings of the 59th APPITA Annual Conference and Exhibition incorporating the 13th ISWFPC (International Symposium on Wood, Fibre, and Pulping Chemistry), held in Auckland, New Zealand (May 16-19, 2005). [Carlton, Victoria, Australia]: APPITA, c2005.

Author(s)Agarwal, Umesh P.

Publication Year: 2005  View PDF »

Category: Journal Articles

Abstract: It is well known that paper produced from mechanical-pulp-containing fiber furnish yellows upon exposure to light. Although the accelerated light-aging test method has been used to compare papers and predict long term performance, the reliability of the light-aging method has been questioned. Therefore, a method that can correctly predict a paper's light stability is desirable. In this work, a new technique is proposed that is capable of ranking papers for their photoyellowing characteristic and is based upon the amount of the pulp-hydroquinone present. The technique entails quenching, by oxygen, of the laser-induced fluorescence (LIF) of paper. The LIF of both mechanical pulp containing papers and hydroquinone model was found to be sensitive to molecular oxygen indicating that the latter structures were almost certainly the cause of the oxygen sensitivity of the paper's LIF. The hydroquinone structures have already been shown to be involved in the mechanism of photoyellowing. Using the LIF method, photoyellowing behavior of 15 printing and writing papers- both mechanical pulp-containing and mechanical pulp-free - was predicted and compared to the papers' ranking based on the accelerated light aging test. For these papers, photostability rank from accelerated aging and fluorescence quenching were found to be some what different. The reasons for such differences are not yet clear. Irrespective of the disparity, the conclusion was that the oxygen sensitivity of the LIF is a method that is potentially suitable to predict the photostability of the mechanical pulp containing papers.

Keywords: Photoyellowing, mechanical pulping, paper, photostability, hydroquinone, accelerated aging, fluorescence

File size: 124 kb(s)

This publication is also viewable on Treesearch:  view
RITS Product ID: 12154
Current FPL Scientist associated with this product
Agarwal, Umesh P.
Research Chemist
  

Additional items that might interest you
View the video celebrating FPL's 100 years of public service in 2010, from the producers of the Greatest Good....view

Research Highlights from FPL....view

Termite Eradication: A search for the Holy Grail.... view

Moisture Management in Residential Construction Series videos...view

Wood Floor Systems in Residential Construction Series videos....view
- FPL's Mission and Strategic Plan -

FPL's mission is to identify and conduct innovative wood and fiber utilization research that contributes to conservation and productivity of the forest resource, thereby sustaining forests, the economy, and quality of life. ... ..more »

- FPL Research Emphasis Areas -
Advanced Composites

As an integral part of the FPL mission, we improve the long-term sustainability of our Nation's forests by creating valuable composite products from biobased materials ... ..more »


Advanced Structures

The FPL has been in the forefront of wood-frame housing research since 1910 and has long been recognized as a world leader in such housing-related areas as engineered wood ... ..more »


Forest Biorefinery

We all know the compelling reasons that the United States needs to reduce its dependence on fossil fuels. Historically, the greatest increases in energy demand have been for transportation fuels ... ..more »


Nanotechnology

A leader in wood products research for over a century, the FPL is positioning itself to become the lead Federal research facility for the application of nanotechnology in forest products ... more »


Woody Biomass Utilization

Forests in the United States contain a substantial amount of small-diameter, overstocked, and underutilized material.FPL research projects are exploring the potential of the small-diameter ... ..more »