標準號：ISO 5269-3-2008
中文標準名稱：紙漿.物理測試用試驗室薄板材的制備.第3部分:使用封閉水系統的常用快速K?then紙頁成形器
英文標準名稱：Pulps - Preparation of laboratory sheets for physical testing - Part 3: Conventional and Rapid-K?then sheet formers using a closed water system
標準類型：Y31
發布日期：1999/12/31 12:00:00
實施日期：1999/12/31 12:00:00
中國標準分類號：Y31
國際標準分類號：85.040
適用范圍：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.