纸浆.物理测试用试验室薄板材的制备.第3部分:使用封闭水系统的常用快速Köthen纸页成形器

[中文适用范围]： ISO 5269-3:2008 规定了制备处于保留平衡状态的封闭水系统的两种程序，用于从高细粉含量的纸浆制备实验室纸张。 一种程序适用于使用传统纸张成型机制备实验室纸张，另一种程序适用于使用 Rapid-K'then 纸张成型机制备实验室纸张。 在达到保留平衡之前制备的片材被丢弃。 ISO 5269-3:2008 特别适用于机械纸浆和化学机械纸浆，以及由回收纤维制备的纸浆，即细粉含量高的纸浆，当使用 ISO 5269 中所述的开放式水系统时，细粉的保留效果较差-1 或 ISO 5269-2。 ISO 5269-3:2008 不适用于某些超长纤维的纸浆，例如来自未缩短的棉、亚麻和类似材料的纸浆。 达到保留平衡后，用于测试物理性能的实验室片材的制备遵循ISO 5269-1（传统片材成型机）或ISO 5269-2（Rapid-K'then片材成型机）中描述的程序，以相关者为准。 ISO 5269-3:2008 通常不适用于使用 ISO 5269-1 或 ISO 5269-2 的化学纸浆制备实验室纸张。 ISO 5269-3:2008 不适用于测量 ISO 亮度的实验室表的准备。 这些表可以根据 ISO 3688 准备。 [外文原描述]： ISO 5269-3:2008 specifies two procedures for preparing a closed water system which is in retention equilibrium, to be used for the preparation of laboratory sheets from pulps with a high fines content. One procedure is applicable to the preparation of laboratory sheets using the conventional sheet former and the other using the Rapid-K'then sheet former. The sheets prepared prior to attaining retention equilibrium are discarded. ISO 5269-3:2008 is especially applicable to mechanical and chemimechanical pulps, as well as to pulps prepared from recycled fibres, i.e. pulps with a high fines content for which retention of fines is poor when using the open water system as described in ISO 5269-1 or ISO 5269-2. ISO 5269-3:2008 is not applicable to some very long-fibred pulps, such as those from unshortened cotton, flax and similar materials. After retention equilibrium is attained, the preparation of laboratory sheets for testing the physical properties follows the procedures described in ISO 5269-1 (conventional sheet former) or ISO 5269-2 (Rapid-K'then sheet former), whichever is relevant. ISO 5269-3:2008 is generally not applicable for the preparation of laboratory sheets from chemical pulps for which ISO 5269-1 or ISO 5269-2 are used. ISO 5269-3:2008 is not applicable for the preparation of laboratory sheets for measuring ISO brightness. These sheets can be prepared in accordance with ISO 3688.