Glass Interleaver Paper Produced With Coarse Fibers

Abstract

A paper for use as a slip sheet interleaver for the protection of glass surfaces in which the paper comprises a sheet with a basis weight of 15-60 lb/3,000 ft2, has a bulk density less than 0.75 g/cm3, and has an average fiber coarseness greater than 0.18 mg/m. In comparison to conventional interleaver sheets, this paper is produced from a refined pulp having high coarseness.

What is claimed is: 
     
         1 . A paper used as a slip sheet interleaver for the protection of glass surfaces, the paper comprising a sheet with a basis weight of 15-60 lb/3,000 ft 2 , having a bulk density less than 0.75 g/cm 3 , and an average fiber coarseness greater than 0.18 mg/m. 
     
     
         2 . The paper of  claim 1 , wherein the sheet comprises at least 10% coarse fibers. 
     
     
         3 . The paper of  claim 2 , wherein the at least 10% coarse fibers comprise a set of fibers selected from a group consisting of one or more of southern softwood kraft, southern hardwood kraft, mercerized fibers, Coastal Douglas Fir, Radiata Pine, Fluff Pulp, and synthetic polymeric fibers. 
     
     
         4 . The paper of  claim 1 , wherein the sheet comprises at least 80% coarse fibers. 
     
     
         5 . The paper of  claim 4 , wherein the at least 80% coarse fibers comprise a set of fibers selected from a group consisting of one or more of southern softwood kraft, southern hardwood kraft, mercerized fibers, Coastal Douglas Fir, Radiata Pine, Fluff Pulp, and synthetic polymeric fibers. 
     
     
         6 . The paper of  claim 1 , wherein the sheet has a basis weight of 25-40 lb/3000 ft 2 , a bulk density less than 0.65 g/cm 3 , and an average fiber coarseness greater than 0.20 mg/m. 
     
     
         7 . The paper of  claim 1 , wherein the sheet has a Scott Bond strength greater than 200 g. 
     
     
         8 . The paper of  claim 1 , wherein the sheet has a Scott Bond strength greater than 250 g. 
     
     
         9 . The paper of  claim 1 , wherein the sheet has a Parker smoothness greater than 7.5 μm on both sides 
     
     
         10 . The paper of  claim 1 , wherein the sheet has a Parker smoothness greater than 8.5 μm on both sides. 
     
     
         11 . The paper of  claim 1 , wherein the sheet has a surface roughness (Sa) greater than 4.5 μm on both sides. 
     
     
         12 . The paper of  claim 1 , wherein the sheet has a surface roughness (Sa) greater than 5.0 μm on both sides. 
     
     
         13 . The paper of  claim 1 , wherein the sheet has a void volume greater than 1.30 g/g. 
     
     
         14 . The paper of  claim 1 , wherein the sheet has a void volume greater than 1.40 g/g. 
     
     
         15 . The paper of  claim 1 , wherein the sheet has an average fiber length (LWFLA) less than 1.9 mm. 
     
     
         16 . The paper of  claim 1 , wherein the sheet has an average fiber length (LWFLA) less than 2.1 mm. 
     
     
         17 . The paper of  claim 1 , wherein the sheet has a short fiber and fines content greater than 10% in which the short fibers and fines are less than 0.5 mm. 
     
     
         18 . The paper of  claim 17 , wherein the sheet has a long fibers content greater than 5% in which the long fibers are greater than 3.5 mm. 
     
     
         19 . The paper of  claim 1 , wherein the sheet has a content of medium length fibers between 0.9 mm and 2.7 mm of less than 55%. 
     
     
         20 . The paper of  claim 1 , wherein the sheet has a short fiber and fines content greater than 15% in which the short fibers and fines are less than 0.5 mm. 
     
     
         21 . The paper of  claim 1 , wherein the sheet has less than 0.5 parts per million (ppm) poly dimethyl siloxane (PDMS) content. 
     
     
         22 . The paper of  claim 1 , wherein the sheet has less than 0.35% ash content. 
     
     
         23 . The paper of  claim 1 , wherein the paper comprises a binding agent. 
     
     
         24 . The paper of  claim 23 , wherein the binding agent is selected from the group of adhesives consisting of acrylic latex, styrene butadiene copolymer, butadiene acrylonitrile copolymer, polyurethane, polyvinyl acetate, polyvinyl alcohol, natural rubber or other nature-based adhesive, polyvinyl chloride, polychloroprene, epoxy, phenol, urea-formaldehyde, and thermal melt adhesive. 
     
     
         25 . The paper of  claim 23 , wherein the binding agent is fiber comprised of at least one polymer selected from the group of polymers consisting of polyolefin, polyester, polyamide, polylactide, polycaprolactone, polycarbonate, polyurethane, polyvinyl acetate, polyvinyl chloride, polyvinyl alcohol, polyacrylate or polyacrylonitrile, and ionomer. 
     
     
         26 . A method of making the paper of  claim 1 , the method comprising the use of refining equipment, refining energy level, and fiber types to produce the paper comprising fibers having a wide fiber length distribution wherein the sum of short fibers and fines and long fibers is greater than 20% of the fiber mix in which the short fibers and fines are less than 0.5 mm and in which the long fibers are greater than 3.5 mm. 
     
     
         27 . A method of making the paper of  claim 1 , the method comprising the step of using of a paper machine forming section to make the paper, in which the forming section includes at least one of a Fourdrinier, Inclined Wire Former, Cylinder Former, Twin Wire Former, Gap Former, Top Former, Multi-layer Former, and Tanmo. 
     
     
         28 . A method of separating sheets of glass using the paper of  claim 1 , the method comprising separating two sheets of glass by positioning the paper therebetween.