Development of Multi-functional Mulch Papers and Evaluation of Their Performance(Part 3) -Defoaming Treatment during Trial Production of Mulch Papers and Their Influence on Wet End System-

다기능성 멀칭지의 개발 및 적용성 평가(제3보) -시제품 생상시 공정 백수의 거품제거 처리 및 그 영향에 관하여-

It is required to use substantial amount of wet strength resin for producing multi-functional mulch papers since these paper products shold maintain its strength properties when they exposed to outdoor weather for several months. While producing mulch papers it is usual to observe significant amount of foam at white water silo. Thus it is imperative to use defoaming or antifoaming agents. In this study diverse defoaming and antifoaming agents have been tested for their effective-ness in eliminating foams that produced. It was shown that combined use of a silicone type defoamer and a fatty acid type anti-foaming agent was msot effective in eliminating foams. These chemicals were used in trial production of mulch papers and their influence on paper-making wet end system was examined including one pass retention cationic demand con-ductivity pH etc. It was found that the defoaming agents were very effective for removing foams in trial production. Tensile strengths of the mulch papers produced were significantly greater than commericial mulch papers produced in Japan.