パルプ製造時の温帯産材抽出成分の挙動-2-スギ心材の難蒸解性と難漂白性
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概要
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Difficulties in multi-stage bleaching (CEDED) of sulfate pulps from woods of sugi (<I>Cryptomeria japonica</I>) are attributed mostly to the wood extractives. However, these are also affected by the unusually high contents of lignin, which may prevent from penetration of cooking liquor resulting in some difficulties in cooking. To soften the trouble, short-time cooking at 180°C was shown to be preferable.<BR>Cooking of the mixed sugi and akamatsu (<I>Pinus densi flora</I>) woods was proved to be highly effective on dissolving out the harmful former extractives to the spent liquor. Moreover, seasoning of both sugi heartwoods and the woods from thinning forest for a month reveals desirable effect on brightness and color reversion, respctively. Although neither brightness of 84.8 nor PC number of 2.5 of the latter BKP are yet good enough, the values nearly correspond to those 85.1 and 2.2 of BKP from fresh sapwoods of 100 %.
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