The Influence of Newspaper Aging on Optical Properties of its De-Inked Pulp

Mehdi RAHMANINIA

Article Details

The Influence of Newspaper Aging on Optical Properties of its De-Inked Pulp

Authors:

Mehdi RAHMANINIA

Publisher:

TUBITAK

Journal:

Turkish Journal of Engineering and Environmental Sciences 2008 Vol.32 Issue 1, pp.35-39

Document Type:

Article

Publication Date:

12/2007

Document Language:

Turkish

Document ID (Org No.):

2000744876

Frequency:

Tri-annual

eISSN:

1303-6157

pISSN:

1300-0160

Abstract:

 

The ever increasing volume of waste newspaper indicates the  importance and availability of this paper for recycling.  However,  aging of the print, especially offset print, plays an important role  in recycling, which requires additional consideration.  The effects of  aging and sodium hydroxide on de-inking of old newspaper is  investigated.  In all, 4 natural aging periods (0, 4, 8, and 12 months) and 5  concentrations of sodium hydroxide (0%, 0.5%, 1.0%, 1.5%,  and 2.0% on bone-dry (BD) weight of the paper) were employed to  study the de-inking of offset printed newspaper.  Optical properties  of recycled paper, including brightness, yellowness, and absorption  coefficient, were measured.  The results indicate that the treatment of non-aged newspaper with 1.5%   sodium hydroxide produced the best de-inking. Aging newspaper for 4 months   and longer decreased the brightness of de-inked pulp and increased the   absorption coefficient, whereas higher doses of sodium hydroxide increased   brightness and decreased the absorption coefficient. No significant   difference was observed between 1.5% and 2% sodium hydroxide. Aging   decreased yellowness and sodium hydroxide increased it.

 

The ever increasing volume of waste newspaper indicates the  importance and availability of this paper for recycling.  However,  aging of the print, especially offset print, plays an important role  in recycling, which requires additional consideration.  The effects of  aging and sodium hydroxide on de-inking of old newspaper is  investigated.  In all, 4 natural aging periods (0, 4, 8, and 12 months) and 5  concentrations of sodium hydroxide (0%, 0.5%, 1.0%, 1.5%,  and 2.0% on bone-dry (BD) weight of the paper) were employed to  study the de-inking of offset printed newspaper.  Optical properties  of recycled paper, including brightness, yellowness, and absorption  coefficient, were measured.  The results indicate that the treatment of non-aged newspaper with 1.5%   sodium hydroxide produced the best de-inking. Aging newspaper for 4 months   and longer decreased the brightness of de-inked pulp and increased the   absorption coefficient, whereas higher doses of sodium hydroxide increased   brightness and decreased the absorption coefficient. No significant   difference was observed between 1.5% and 2% sodium hydroxide. Aging   decreased yellowness and sodium hydroxide increased it.

Article Details

The Influence of Newspaper Aging on Optical Properties of its De-Inked Pulp

Authors: Mehdi RAHMANINIA

Publisher: TUBITAK

Journal: Turkish Journal of Engineering and Environmental Sciences 2008 Vol.32 Issue 1, pp.35-39

Document Type: Article

Publication Date: 12/2007

Document Language: Turkish

Document ID (Org No.): 2000744876

Frequency: Tri-annual

eISSN: 1303-6157

pISSN: 1300-0160

Issues

Authors:

Mehdi RAHMANINIA

Publisher:

TUBITAK

Journal:

Turkish Journal of Engineering and Environmental Sciences 2008 Vol.32 Issue 1, pp.35-39

Document Type:

Article

Publication Date:

12/2007

Document Language:

Turkish

Document ID (Org No.):

2000744876

Frequency:

Tri-annual

eISSN:

1303-6157

pISSN:

1300-0160