PURPOSE: To increase the strength of a laminated paper sheet, and enable the clean laminated surface of the sheet to be used for finish cleaning after peeling off a contaminated sheet by bonding each sheet with such strength as allowing easy separation in the laminated paper sheet having both sides coated like a mesh with water insoluble bonding material.

CONSTITUTION: A pulp material made of marcerized conifer bleached Kraft pulp is formed into a sheet of 25g/m2 weight, using a Fortliner/Yankee patter machine. One side of the sheet is coated with a self-cross-linking type acrylic binder as a bonding material (coating material). Two sheets so coated are bonded to each other and dried. In this case, the aforesaid two sheets are bonded with strength allowing easy separation. Also, the amount of the coating material to be used is 6g/m2. According to this construction, both of a laminated paper sheet and a separated sheet give enough strength for use in a cleaning work.