Patent ID: 6287424
Filing Date: 2001-09-11
Classification: D21G,Y10T

Abstract:
A method for manufacturing a paperboard product, comprising the steps of:wet laying at least one ply of pulp to form a web;removing water from said web;arranging a comfortable belt to form a nip with a calendar roll, said nip having a nip width in a range of 1 to 10 cm and a nip load in a range of 300 to 2,500 pli;heating a surface of said calendar roll to a temperature in the range of 250-400.degree. F;passing said web through said nip such that one side of said web contacts said heated calendar roll;coating both sides of said web with polymeric material after said passing step; andprinting on the side of said coated web which contacted said heated calendar roll,wherein the nip width, nip load and surface temperature of said calendar roll are selected so that a surface of said one side of said web which contacts said heated calendar has a Parker smoothness less than 6.5 and a Hagerty/Sheffield smoothness not less than 280 Sheffield units.