Mill practice report on Asia Paper Industrial Corporation : Special topic: Addressing the problem of repulping waste papers

Date

10-2011

Degree

Bachelor of Science in Chemical Engineering

Major Course

Major in Pulp and Paper Technology

College

College of Engineering and Agro-Industrial Technology (CEAT)

Abstract

The mill practice was held at Asia Paper Industrial Corporation, Trece Martires City, Cavite. For five-week duration, five different departments became the venues for duties assigned to the practicum students. The said plant has a three-year old problem regarding waste papers from two different suppliers, namely Maruzen and Seaside, which caused difficulties in repulping. Those waste papers did not disintegrate properly, thus, causing clogging in the draining part of the hydrapulper. The production department's initial solution was to lessen the amount of these waste paper in the furnish comprising only 10 percent, however, large flakes were still observed in the hydrapulper which resulted again to clogging. Then, they employed sodium hydroxide during repulping process, but, this did not work as well.Addressing the problem in repulping wet-strengthened waste papers was given to the practicum student, which in turn served as the special topic for the practicum report. Samples coming from Maruzen and Seaside were taken to Forest Product research and Development Institute-Pulp and Paper Testing Laboratory and Department of Forest Product and Paper Science-Wood Chemistry Laboratory for testing. Ash content, moisture content, and freeness were tested at the two laboratories. Seaside papers contain more ash than that of Maruzen. Increase in ash contents implies more fillers in the paper, thus, making it glossier in appearance. Average moisture content obtained for Maruzen and Seaside are 7.28 and 5.34 percent respectively. It is said that papers with lower moisture content require relatively high energy to repulp. Disintegration was done to determine the freeness. It was found out that Maruzen papers require only amplified shearing actions to be repulped. At two percent consistency and 3000rpm, the paper fibers were already dispersed. While for Seaside papers, an addition of t least 15mL of 5.65 per cent hypochlorite solution per 50 grams of sample is required for the disintegration to proceed. The freeness obtained for all the trials made ranges from 760 to 830mL CSF which further suggest series of refining processes to produce acceptable fibers.

Language

English

Location

UPLB College of Engineering and Agro-Industrial Technology (CEAT)

Call Number

LG 993.5 2011 E62 /S25

Document Type

Thesis

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