Prevention of bacterial spore formation in a broke system of a board machine
AssigneeKemira Oyj
InventorMarko Kolari
Life of this patent
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Abstract
The invention relates to a method for preventing or delaying bacterial sporulation in the broke system of a board or paper machine by lowering the content of transition metals in the broke to a level unfavorable for sporulation. Preferably bacterial cells present in the broke system of the board or paper machine are not substantially killed by the procedure used for lowering the content of the transition metals. The invention further relates to a method for producing packaging board or packaging paper having a low bacterial spore content.
Claims20
Method for preventing or delaying bacterial sporulation in the broke system of a board or paper machine, wherein the method comprises the step of lowering the content of transition metals in the broke by chelation to a level unfavorable for sporulation;
- said procedure used for lowering the content of the transition metals not substantially killing bacterial cells present in the broke system of the board or paper machine.
Method for producing packaging board or packaging paper, wherein broke is used in producing the packaging board or packaging paper, comprising the steps of:
- lowering the content of transition metals in the broke to a level unfavorable for sporulation, said procedure not substantially killing bacterial cells present in the broke system of the board or paper machine;
- and
- producing packaging board or packaging paper.
Method for preventing or delaying bacterial sporulation in the broke system of a board or paper machine, comprising the steps of:
- contacting a chelating agent with a broke in the broke system;
- and
- binding transition metals in the broke with said chelating agent, thereby lowering the content of transition metals to a level unfavorable for sporulation, said procedure used for lowering the content of the transition metals not substantially killing bacterial cells present in the broke system of the board or paper machine.
Method for producing packaging board or packaging paper, wherein broke is used in producing the packaging board or packaging paper, comprising the steps of,
- contacting a chelating agent with a broke in the broke system;
- binding transition metals in the broke with said chelating agent, thereby lowering the content of transition metals to a level unfavorable for sporulation, said procedure used for lowering the content of the transition metals not substantially killing bacterial cells present in the broke system of the board or paper machine;
- and
- producing packaging board or packaging paper.
Dependencies are inferred from the claim text.