The present invention concerns a process for making a core board / cone board / core liner paper, particularly kraft paper, in which fibres are pulped along with water, starch gel and other compounds in a pulper in a batch process, cleaning, agitating, screening on paper machine and calendaring to obtain monolithic core Paper. According to the present invention is characterized in that the core Board manufactured in accordance with this invention offers higher grammage monolithic board of up to 1500 grams per square meter in single layer, higher Ply Bond from 280 up to 1500 jules/m 2 , higher horizontal and vertical compression strengths for spiral and parallel winding applications.