Wet laid sheet material of a microfibrillated material composition
AssigneeStora Enso OYJ
InventorsIsto Heiskanen, Nina Ruhoniemi, Vesa Lepisto, Jouni Tuomela, Susanna Tapio, Toni Jurvanen, Petri Suhonen
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Abstract
A wet laid sheet material formed from a fibrous web, characterized in that the initial fibrous web contains >50% a calculated dry microfibrillated material composition by weight of the total fiber material content in the web, wherein the fibrillated material composition has a SR value of >70; and in that the moisture content in the sheet material is >30 wt.-%.
Claims24
A wet laid sheet material comprising a fibrous web that contains >50% calculated as a dry microfibrillated material composition by weight of the total fiber material content in the web, wherein the microfibrillated material composition has a SR value of >70;
- and wherein the moisture content in the sheet material is >30 wt.-%.
A method of forming a wet laid sheet material from a wet fibrous web in a paper machine, wherein an initial wet fibrous web contains >65% dry microfibrillated material composition by weight of the total fiber material content in the web, wherein the microfibrillated material composition has an SR value of >70, and wherein the moisture content in the sheet material is >30%, the method comprising the steps of:
- i) providing a stock suspension containing >65% dry microfibrillated material composition by weight of the total fiber material content in the suspension, in a head box of the paper machine;
- ii) supplying said stock suspension onto a first wire in a forming section of the paper machine in such a way that the initial wet web is formed;
- and
- iii) wet pressing said wet web in a press section of the paper machine, thereby forming said wet laid sheet material.
Dependencies are inferred from the claim text.