Method for producing a foam web

Patent metadata

Field	Value
Publication number	US-10301775-B2
Application number	US-201515516278-A
Country	US
Kind code	B2
Filing date	Sep 30, 2015
Priority date	Oct 3, 2014
Publication date	May 28, 2019
Grant date	May 28, 2019

Abstract

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 ).

First claim

The invention claimed is:

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.

Assignees

• Stora Enso Oyj

Inventors

• Nordström Jan-Erik
• Räsänen Jari

Classifications

• H01J37/317

  for changing properties of the objects or for applying thin layers thereon, e.g. for ion implantation (H01J37/36 takes precedence) · CPC title

• H01J31/00

  Cathode ray tubes; Electron beam tubes (H01J25/00, H01J33/00, H01J35/00, H01J37/00 take precedence; details of cathode ray tubes or of electron beam tubes H01J29/00) · CPC title

• C08J9/36

  After-treatment (C08J9/22 takes precedence) · CPC title

• D21H27/30

  Multi-ply (for surface covering D21H27/18; making on paper-making machines D21F9/00, D21F11/00) · CPC title

• D21F11/002 Primary

  by using a foamed suspension · CPC title