Abstract: The paper web is passed on the production line between at least one pair of rollers, of which one is of soft material driven at greater speed, the hard material roller presenting a base roughness RA of less than 5 and along its entire lateral surface having incisions that are precisely spaced.

Abstract: A method for producing extensible paper, comprising the following stages:feeding a mix of vegetable fibres to a kneader member,mixing the mix with water in the kneader,beating the fibres to obtain a pulp,transferring the beaten pulp into a flow chest,feeding the beaten pulp from the flow chest onto a paper web formation cloth with consequent reduction of the water percentage by gravity and vacuum,pressing the web, with consequent further reduction of its water content,initial drying of the paper web to a substantially constant moisture content of between 15% and 65%,compacting,final drying to a moisture content of between 15% and 4%, preferably 10%-8%,glazing,wherein:the beating stage is carried out by rubbing the fibres in a multistage unit to obtain a pulp having a degree of beating of at least 30.degree.