Paper product and method for manufacturing

Abstract

The invention relates to a paper product and a method for manufacturing a paper product. In an embodiment, the invention includes a paper product including a paper substrate comprising a web of fibers having a first surface and a second surface and having a selective indicator provided over the first surface, the first surface observably different than the second surface under a selective condition. A first release coating can be provided over the first surface or the second surface. In an embodiment, the invention includes a method for forming a paper product comprising applying a composition having a selective indicator to a web of fibers having a first surface and a second surface, wherein the composition is applied to the first surface and results in the first surface being observably different under a selective condition. The method further includes applying a first release composition to one of the first surface or second surfaces to form the paper product.

1 . A paper product comprising: 
 a paper substrate comprising a web of fibers having a first surface and a second surface and having a selective indicator provided over the first surface, the first surface observably different than the second surface under a selective condition; and    a first release coating provided over the first surface or the second surface.    
     
     
         2 . The paper product of  claim 1 , further comprising a second release coating provided over the surface opposite the first release coating.  
     
     
         3 . The paper product of  claim 2 , wherein the paper product comprises a differential release liner.  
     
     
         4 . The paper product of  claim 1 , wherein the selective indicator is provided on the first surface.  
     
     
         5 . The paper product of  claim 1 , wherein the selective condition comprises UV light.  
     
     
         6 . The paper product of  claim 1 , wherein the selective indicator is an optical brightener.  
     
     
         7 . The paper product of  claim 1 , the optical brightener comprising at least one of stilbene derivatives, styryl derivatives of benzene and biphenyl, pyrazolines, bis(benzoxazol-2-yl) derivatives, coumarins, carbostyrils, and naphthalimides.  
     
     
         8 . The paper product of  claim 1 , the optical brightener comprises diamino stilbene, diethanolamine, or diisopropanol amine.  
     
     
         9 . The paper product of  claim 1 , the optical brightener comprising a stilbene derivative.  
     
     
         10 . The paper product of  claim 1 , the optical brightener comprising diamino stilbene.  
     
     
         11 . The paper product of  claim 1 , the first release coating comprising a polyorganosiloxane.  
     
     
         12 . The paper product of  claim 11 , the first release coating comprising polydimethyl siloxane.  
     
     
         13 . The paper product of  claim 2 , the second release coating comprising a polyorganosiloxane.  
     
     
         14 . The paper product of  claim 13 , the second release coating comprising polydimethyl siloxane.  
     
     
         15 . The paper product of  claim 2 , the first and second release coatings comprising a combined amount of about 0.6 lbs. per 3000 ft 2 .  
     
     
         16 . The paper product of  claim 1 , wherein the web of fibers has a weight of between 30 lbs./3,000 ft. 2  and 120 lbs./3,000 ft. 2 .  
     
     
         17 . The paper product of  claim 1 , wherein the web of fibers has a Canadian Standard Freeness value of between about 50 cm 3  and 500 cm 3  according to TAPPI test T 227.  
     
     
         18 . A method for forming a paper product comprising: 
 (a) applying a composition comprising a selective indicator to a web of fibers having a first surface and a second surface, wherein the composition is applied to the first surface and results in the first surface being observably different under a selective condition; and    (b) applying a first release composition to one of the first surface or second surfaces to form the paper product.    
     
     
         19 . The method of  claim 18 , further comprising applying a second release composition to the surface opposite the surface that the first release composition was applied to.  
     
     
         20 . The method of  claim 19 , wherein the paper product comprises a differential release liner.  
     
     
         21 . The method of  claim 18 , the selective condition comprising UV light.  
     
     
         22 . The method of  claim 18 , the selective indicator comprising an optical brightener.  
     
     
         23 . The method of  claim 22 , the optical brightener comprising at least one of stilbene derivatives, styryl derivatives of benzene and biphenyl, pyrazolines, bis(benzoxazol-2-yl) derivatives, coumarins, carbostyrils, and naphthalimides.  
     
     
         24 . The method of  claim 22 , the optical brightener comprising diamino stilbene, diethanolamine, or diisopropanol amine.  
     
     
         25 . The method of  claim 22 , the optical brightener comprising a stilbene derivative.  
     
     
         26 . The method of  claim 22 , the optical brightener comprising diamino stilbene.  
     
     
         27 . The method of  claim 18 , the first release composition comprising a polyorganosiloxane.  
     
     
         28 . The method of  claim 18 , the first release composition comprising polydimethyl siloxane.  
     
     
         29 . The method of  claim 19 , the second release composition comprising a polyorganosiloxane.  
     
     
         30 . The method of  claim 19 , the second release composition comprising polydimethyl siloxane.  
     
     
         31 . The method of  claim 19 , wherein the first and second release coatings are applied in amounts to result in a combined release liner coating weight of about 0.6 lbs. per 3000 ft 2 .  
     
     
         32 . The method of  claim 18 , wherein the web of fibers has a weight of between 30 lbs./3,000 ft. 2  and 120 lbs./3,000 ft. 2 .  
     
     
         33 . The method of  claim 19 , wherein the web of fibers has a Canadian Standard Freeness value of between about 50 cm 3  and 500 cm 3  according to TAPPI test T 227.  
     
     
         34 . A method for forming a paper product comprising: 
 applying a first release composition to a surface of a web of fibers to form a paper product, the web of fibers having first and second surfaces, the web of fibers having a selective indicator provided on or provided over the first or second surface so that the first surface and the second surface are observably different under a selective condition.    
     
     
         35 . The method of  claim 34 , further comprising applying a second release composition to the surface opposite the surface that the first release composition was applied to.  
     
     
         36 . The method of  claim 34 , wherein the paper product comprises a differential release liner.  
     
     
         37 . The method of  claim 34 , the selective condition comprising UV light.  
     
     
         38 . The method of  claim 34 , the selective indicator comprising an optical brightener.  
     
     
         39 . The method of  claim 38 , the optical brightener comprising at least one of stilbene derivatives, styryl derivatives of benzene and biphenyl, pyrazolines, bis(benzoxazol-2-yl) derivatives, coumarins, carbostyrils, and naphthalimides.  
     
     
         40 . The method of  claim 38 , the optical brightener comprising diamino stilbene, diethanolamine, or diisopropanol amine.  
     
     
         41 . The method of  claim 38 , the optical brightener comprising a stilbene derivative.  
     
     
         42 . The method of  claim 38 , the optical brightener comprising diamino stilbene.  
     
     
         43 . The method of  claim 34 , the first release composition comprising a polyorganosiloxane.  
     
     
         44 . The method of  claim 34 , the first release composition comprising polydimethyl siloxane.  
     
     
         45 . The method of  claim 35 , the second release composition comprising a polyorganosiloxane.  
     
     
         46 . The method of  claim 35 , the second release composition comprising polydimethyl siloxane.  
     
     
         47 . The method of  claim 35 , wherein the first and second release coatings are applied in amounts to result in a combined release liner coating weight of about 0.6 lbs. per 3000 ft 2 .  
     
     
         48 . The method of  claim 34 , wherein the web of fibers has a weight of between 30 lbs./3,000 ft. 2  and 120 lbs./3,000 ft. 2 .  
     
     
         49 . The method of  claim 34 , wherein the web of fibers has a Canadian Standard Freeness value of between about 50 cm 3  and 500 cm 3  according to TAPPI test T 227.