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Paper Information

Journal:   JOURNAL OF AGRICULTURAL SCIENCES   MARCH 2008 , Volume 13 , Number 1 (SUPPLEMENT); Page(s) 241 To 258.
 
Paper: 

EVALUATING THE EFFECT OF METAL IONS OF MEDIUM ELEMENTS ON THE YELLOWNESS PROPERTY OF CHEMIMECHANICAL PAPERS PRODUCED IN THE WOOD AND PAPER FACTORIES OF MAZANDARAN

 
 
Author(s):  NEMATI M., HEMMASI A.H.*, BAZYAR B.
 
* WOOD & PAPER INDUSTRIAL ENGINEERING DEPT., SCIENCE & RESEARCH CAMPUS (TEHRAN)
 
Abstract: 
This research is commissioned in order determine the Yellowness variation of chemimechanical papers produced in the wood and paper factories of Mazandaran when sample treating with metal ions of medium elements and methods of them reading. Two types of chemimechanical paper samples were prepared: bleached and unbleached papers.
Samples included two types of smears:
1. First, The samples were smeared with EDTA in different densities. This process ended in neutralization of existent ions in CMP paper samples.
2. in the second stage treatment, after dehydrating each of the above- mentioned samples that were combined with EDTA, The CMP samples were smeared with solvents including metal ions of medium elements and then put them under the radiance of UV Black Light lamps.
One of the objectives of this research was to determine what kind of effect could have different metals on the Aging and Yellowing process. In the final stage, the light specification of samples such as Yellowness was measured. The highest spoiling effect on the yellowing process was determined to be F e2+ ion and the lowest effect was issued by Al3+ ion. For decreasing the effect of each metal ion, increasing the density of EDTA, decreasing the pH of pulps and methods such as methylation methods were suggested.
 
Keyword(s): EDTA, YELLOWNESS, PHOTO YELLOWING, CMP
 
References: 
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