Method for applying starch to a paper or paperboard web
AssigneeStora Enso OYJ
InventorsKaj Backfolk, Isto Heiskanen, Johanna Lyytikainen
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Abstract
The invention relates to a method for applying starch to a paper or paperboard web, the method comprising the steps of: providing an aqueous suspension comprising starch particles and at least 1 wt %, based on the dry solid content of the suspension, of an amphiphilic polymer, creating a foam of the aqueous suspension, and applying the foam to the paper or paperboard web. The invention further relates to a paper or paper board product obtained by the method.
Claims15
A method for applying starch to a paper or paperboard web, the method comprising the steps of:
- providing an aqueous suspension comprising starch particles and at least 1 wt %, based on a dry solid content of the aqueous suspension, of an amphiphilic polymer, wherein the starch particles are uncooked or partly uncooked starch, wherein the starch particles are not nanofibrillated or microfibrillated cellulose, and wherein the suspension contains less than 1% of a surfactant based on the dry solid content of the suspension,
- creating a foam from the aqueous suspension, wherein a solid content of the foamed aqueous suspension is in a range of ≥15 wt % to ≥50 wt %, based on a total weight of 100 wt % of the foamed suspension;
- and
- applying the foam to the paper or paperboard web.
A method for applying starch to a paper or paperboard web, the method comprising the steps of:
- providing an aqueous suspension comprising starch particles and at least 1 wt %, based on a dry solid content of the aqueous suspension, of an amphiphilic polymer,
- creating a foam from the aqueous suspension, and
- applying the foam to the paper or paperboard web, wherein the foam is applied to a paper or paperboard web having a solid content of less than 50 wt %, based on a total weight of 100 wt % of the paper or paperboard web.
Dependencies are inferred from the claim text.