Method for making a sheet of degradable paper, use of said sheet for making a mandrel defining a roll carrier, degradable paper sheet, and mandrel including at least one of said sheets

A method for manufacturing a roll support core, comprising:

• helically winding one or more bands, taken from a sheet of paper, around a cylinder, the sheet of paper manufactured by a method according to the following:
• supplying at least one band of water-soluble binder material in the form of a dry film, supplying at least two bands each formed from at least one ply of cellulose fiber, placing one of the at least one band of water-soluble binder material between two consecutive bands of the at least two bands of cellulose fiber, resulting in a plurality of bands, wetting, joining and pressing the plurality of bands to form a complex band, drying the complex band obtained.

A sheet of paper that disintegrates in water, comprising:

• a basis weight of between 80 and 400 g/m2, containing 20 to 70% of a water-soluble binder, the sheet of paper manufactured by a method according to the following:
• supplying at least one band of water-soluble binder material in the form of a dry film, supplying at least two bands each formed from at least one ply of cellulose fiber, placing one of the at least one band of water-soluble binder material between two consecutive bands of the at least two bands of cellulose fiber, resulting in a plurality of bands, wetting, joining and pressing the plurality of bands to form a complex band, drying the complex band obtained.

A core for rolls, comprising:

• a helical winding of one or more bands of paper, wherein each of the one or more bands is a sheet of paper that disintegrates in water, the sheet of paper comprising a basis weight of between 80 and 400 g/m2, containing 20 to 70% of a water-soluble binder, the sheet of paper manufactured by a method according to the following:
• supplying at least one band of water-soluble binder material in the form of a dry film, supplying at least two bands each formed from at least one ply of cellulose fiber, placing one of the at least one band of water-soluble binder material between two consecutive bands of the at least two bands of cellulose fiber, resulting in a plurality of bands, wetting, joining and pressing the plurality of bands to form a complex band, drying the complex band obtained.