Method for forming webs of transversely extensible fibrous material, in particular paper, and apparatus for implementing the method
AssigneeGiorgio Trani
InventorsGiorgio Trani, Marion Sterner
Life of this patent
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Abstract
A method for producing webs of transversely extensible fibrous material, in particular paper, characterised by causing a web (12) of pliable fibrous material having a water content between 20% and 80% to adhere to at least one continuous elastic band elastic (6, 26, 31, 46, 66) adhering to the lateral surface of a first rotating roller, provided on its lateral surface with at least one circumferential cavity and to temporarily and locally pre-stretched said band by making it to enter into said at least one cavity for interference from at least one second rotating roller having its axis parallel to the axis of the first roller.
Claims20
A method for producing webs of transversely extensible fibrous material, in particular paper, comprising:
- causing a web of pliable fibrous material having a water content between 20% and 80% to adhere to at least one continuous elastic band adhering to a lateral surface of a first rotating roller, provided on its lateral surface with at least one circumferential cavity;
- and
- causing said band to become temporarily and locally pre-stretched by making it enter into said at least one cavity for interference from at least one second rotating roller having its axis parallel to the axis of the first roller.
An apparatus for producing webs of transversely extensible fibrous material starting from a web having a moisture content between 20% and 80%, comprising:
- an endless band of elastic material wrapping a first rollered member provided with at least two outer rollers, with at least one circumferential cavity delimited by said two outer rollers, and with means for securing the longitudinal edges of said endless band to said outer rollers;
- and
- a second rollered member brought into interference with said first rollered member to cause that surface of said band not secured to said outer rollers to enter said cavity.
Dependencies are inferred from the claim text.