Method for producing a corrugated laminate containing waterglass
The present application relates to a method for producing a laminate comprised of alternating smooth and corrugated sheets and which are to form a corrugated structure for the manufacture of contactors, characterized by that a first starting material is impregnated with a solution comprising water glass and additive whereas the additive is present at a high level and which is later corrugated and that a second starting material is impregnated with a solution comprising water glass and additive whereas the additive is present at a moderate level and that the both starting materials are brought together after the corrugation of the first starting material whereby the adhesion is maintained at a high level. The present application also relates to a laminate obtainable by said method and a contactor manufactured from a laminate obtainable by said method.
1. A method for producing a laminate comprised of alternating smooth and corrugated sheets which are to form a corrugated structure for the manufacture of contractors for the exchange of heat, moisture and the like including the steps of:
impregnating a first formable starting material with a solution comprising water glass and an additive, wherein the additive is present at a high level and thereafter corrugating the first formable material,
impregnating a second starting material with a solution comprising water glass and an additive wherein the additive is present at a moderate level, and
thereafter bringing the first and second starting materials together after corrugating the first starting material to thereby produce a laminate.
2. A method according to claim 1 , wherein the high level is from 8.1 to 15% (DS) and the moderate level is from 00.1 to 8% (DS).
3. A method according to claim 2 , wherein the high level is 15% (DS) and the moderate level is 8% (DS).
4. A method according to claim 1 , wherein the water glass is present as a concentrated water glass solution.
5. A method according to claim 4 , wherein the concentrated water glass solution has a dry substance of 35 to 40% (DS).
6. A method according to claim 1 , wherein the corrugating is performed using a tooth contour where a pitch is from 1.3 to 1.7.
7. A method according to claim 6 , wherein the pitch is 1.43.
8. A method according to claim 6 wherein the pitch is from 1.4 to 1.6.
9. The method of claim 1 whenever said first and second starting materials are selected from a group consisting of glass fibers and cellulose materials.
10. A laminate for use in manufacturing of contractors including a first formable material impregnated with a solution comprising water glass and an additive, wherein the additive is present at a high level and the first material is corrugated, a second material impregnated with a solution comprising water glass and an additive wherein the additive is present at a moderate level, and the first and second materials being joined together to thereby produce a laminate.
11. A contractor comprising a laminate body including a first formable material impregnated with a solution comprising water glass and an additive, wherein the additive is present at a high level and the first material is corrugated, a second material impregnated with a solution comprising water glass and an additive wherein the additive is present at a moderate level, and the first and second materials being joined together to thereby produce a laminate.