Über die Eignung von thermo-mechanischem und chemo-thermo-mechanischem Holzstoff (TMP und CTMP) aus Buchen- und Kiefernholz für die Herstellung von mitteldichten Faserplatten (MDF). Tl.1. Aufschluß des Holzes und Eigenschaften der Faserstoffe

A condensed review on the state of the art of the production of medium density fibre boards is given. Thereafter, results of investigations on pulping beech and pine wood under different conditions according to the TMP- and CTMP-process are presented. The pulps derived from both wood species were analysed for some of their physical and chemical properties. The results reveal: Waste water from the CTMP-process has higher chemical and biological oxygen demand. The CTMP-process seems to be milder than the TMP-process as it leads to pulps with higher fibre length, especially in case of beech. The content of acetyle groups is much lower in CTMP-pulps than in TMP-pulps, CTMPpulps emit also more acetic acid than TMP-pulps. With increasing pulping temperature the pH-value decreases and the buffering capacity towards alkali increases.