02188nas|a2200253 i 450000500170000000800410001703500150005810000240007324500790009726000520017630000140022849000260024250001020026850200570037052011690042765000270159665000170162370000370164070000430167770000450172071000460176581000580181185600650186920260818094944.0020219s2000    th  u m rtt  00|  a1eng d  a.b118462640 aPawilai Phopunyasak10aEffect of furnish variables and storage conditions on AKD sizing stability  aBangkok :bAsian Institute of Technology,c2000  a43 leaves1 aThesis ;vno. PP-00-9  aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Science  aThesis (M.Sc.) - Asian Institute of Technology, 2000  aMills using AKD as an internal s1zmg agent in conjunction with precipitated calcium carbonate as filler experience a loss of paper's resistance to liquid penetration with time. In this study some factors affecting this sizing loss, such as filler type, pH of stock, and storage conditions of sized paper were studied. Cobb test was used to determine and follow the development of water resistance of the AKD sized laboratory handsheets. It was found that the initial degree of sizing was critical. If the paper was sufficiently sized, no reversion occurred. High AKD addition can prevent size reversion due to any of the studied variables. AKD was an efficient sizing agent in the absence of filler. When filler was added, sizing performance of paper was suffered. Precipitated Calcium Carbonate (PCC) need lower amount of AKD than Ground Calcium Carbonate (GCC) to get adequate sizing. However, if it was not sized sufficiently, size reversion was higher and faster than GCC. High pH of stock and tropical climate boost size reversion at high PCC loading levels. But the effect was small at low addition level. The effect was also less with GCC filled handsheets.10aPapermakingxChemistry10aPaper sizing1 aRetulainen, Elias,eChairperson 1 aRuhanen, Mauno,eExamination Committee1 aNazhad, Mousa M.,eExamination Committee2 aGovernment of Finland,eScholarship donor2 aAsian Institute of Technology.tThesis ;vno. PP-00-9  3Full-Textuhttp://203.159.5.9/ait-thesis/detail.php?q=B06659