US2018237990A1PendingUtilityA1

Method and apparatus for producing microfibrillated cellulose fiber

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Assignee: STORA ENSO OYJPriority: Aug 27, 2015Filed: Aug 23, 2016Published: Aug 23, 2018
Est. expiryAug 27, 2035(~9.1 yrs left)· nominal 20-yr term from priority
Inventors:Isto HeiskanenHenri KastinenLars AxrupSaija PollanenJani KorhonenPetri SuhonenTeemu TiainenMatti Vakevainen
D21C 9/007D21H 11/18D21D 1/20D21D 1/26D21D 1/008D21D 1/306D21D 1/06Y02W30/64D21D 1/34
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Claims

Abstract

Method for producing microfibrillated cellulose(MFC), wherein the method comprising the steps of: Pre-treating of chemical pulp, such that, the pulp reaches a Schopper-Riegler (SR) value above 50, and refining the pulp, at a consistency of 3-6%, in a refiner with refiner blades, wherein the height of the refiner blades is in the range 2-3 mm.

Claims

exact text as granted — not AI-modified
1 . Method for producing microfibrillated cellulose (MFC) comprising the steps of:
 pre-treating of chemical pulp, such that, the pulp reaches a Schopper-Riegler (SR) value above 50, and   refining the pulp, at a consistency of 3-6%, in a refiner with refiner blades, wherein the height of the refiner blades is in the range 2-3 mm.   
     
     
         2 . Method according to  claim 1 , wherein the refining step further comprises that the cutting edge length (CEL) during refining is higher than 70 km/rev. 
     
     
         3 . Method according to  claim 1 , wherein the surface edge load (SEL) during refining is lower than 0.5. 
     
     
         4 . Method according to  claim 1 , wherein the pH during refining is higher than 8. 
     
     
         5 . Method according to  claim 1 , wherein the temperature during the refining step is higher than 40° C. 
     
     
         6 . Method according to  claim 1 , wherein the refining step further comprises that the refiner blades rotating with a rotation speed of 1000-1600 rpm. 
     
     
         7 . Method according to  claim 1 , wherein the pre-treating step comprising a pre-refining of the chemical pulp. 
     
     
         8 . Apparatus for producing microfibrillated cellulose (MFC) from chemical pulp, characterized in that the apparatus is a refiner for refining chemical pulp with refiner blades, wherein the height of the refiner blades are in the range of 2-3 mm and wherein the cutting edge length (CEL) value of the refiner is higher than 70 km/rev. 
     
     
         9 . Apparatus according to  claim 8 , wherein the refiner is a conical refiner. 
     
     
         10 . Method according to  claim 1 , wherein the surface edge load (SEL) during refining is lower than 0.3. 
     
     
         11 . Method according to  claim 1 , wherein the pH during refining is higher than 9. 
     
     
         12 . Method according to  claim 1 , wherein the temperature during the refining step is higher than 50° C.

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