Method for producing a foam web
Method for producing a sterilized foam web, wherein the method comprising the steps of preparing a wet foam ( 1 ), feeding the wet foam ( 1 ) to a head box ( 2, 11 ), distributing the wet foam by the head box ( 2, 11 ), treating the wet foam ( 1 ) with electron beam radiation ( 3 a, 3 b, 3 c ) to immobilize and sterilize the wet foam ( 1 ), receiving the electron beam treated foam on a moving wire ( 4 ) to form a foam web ( 6, 13 ), pressing and the foam web ( 6, 13 ), and drying the foam web ( 6, 13 ).
1. Method for producing a sterilized foam web, comprising the steps of:
preparing a wet foam in a mixing reactor, wherein the wet foam comprises a mixture of natural fibers, liquid and at least one foam stabilizing additive curable by electron beam radiation;
feeding the wet foam to a head box;
distributing the wet foam by the head box;
treating the wet foam with electron beam radiation to immobilize and sterilize the wet foam after the mixing reactor and before the wet foam hits a moving wire;
receiving the electron beam treated foam on the moving wire to form a foam web;
pressing the foam web, and
drying the foam web.
2. Method according to claim 1 , wherein the electron beam radiation is subjected to the wet foam at the headbox.
3. Method according to claim 1 , wherein the electron beam radiation is subjected to the wet foam before the headbox.
4. Method according to claim 1 , wherein the electron beam radiation is subjected to the wet foam after the headbox.
5. Method according to claim 1 , wherein the headbox is a single-layer headbox, and the headbox distributes the wet foam to form a single-layer foam web on the moving wire.
6. Method according to claim 1 , wherein the headbox is a multi-layer headbox, and the headbox distributes the wet foam and at least one further suspension to form a multi-layer foam web on the moving wire.
7. Method according to claim 1 , wherein the drying comprising a hot cylinder for drying the foam web.
8. Method according to claim 1 , wherein the drying comprises IR radiation for drying the foam web.
9. Method for producing a sterilized foam web, comprising the steps of:
preparing a wet foam in a mixing reactor, wherein the wet foam comprises a mixture of natural fibers, liquid and at least one foam stabilizing additive curable by electron beam radiation;
feeding the wet foam to a head box;
distributing the wet foam by the head box;
treating the wet foam with electron beam radiation to immobilize and sterilize the wet foam after the headbox and before the wet foam hits a moving wire;
receiving the electron beam treated foam on the moving wire to form a foam web;
pressing the foam web, and
drying the foam web.
10. Method for producing a sterilized foam web, comprising the steps of:
preparing a wet foam in a mixing reactor, wherein the wet foam comprises a mixture of natural fibers, liquid and at least one foam stabilizing additive curable by electron beam radiation;
feeding the wet foam to a head box;
distributing the wet foam by the head box;
treating the wet foam with electron beam radiation to immobilize and sterilize the wet foam at the headbox and before the wet foam hits a moving wire;
receiving the electron beam treated foam on the moving wire to form a foam web;
pressing the foam web, and
drying the foam web.