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AssigneeScott Paper Company
InventorsCharles R. Mason, David K. Osteen, Lawrence Vaalburg
Estimating the term…
The method of autogenously bonding a nonwoven web formed predominantly of thermoplastic fibers is characterized by the steps of directing heat into the web from only one surface thereof to preheat the web, and then directing the preheated web through a bonding nip formed between opposed rolls, one of said rolls being hotter than the other roll, being capable of heating the web surface it engages to a temperature above the melt point of the thermoplastic fibers and being positioned to engage the surface of the web opposite the one into which heat was directed during the preheating operation; said webs being preheated by means completely independent of the opposed rolls that form the bonding nip, and most preferably by infrared panels. The nonwoven product formed in accordance with this method also forms a part of the instant invention.
A method of autogenously bonding a nonwoven web formed predominantly of thermoplastic fibers, characterized by the steps of directing heat into the web from only one surface thereof to preheat the web, and then directing the preheated web through a bonding nip formed between opposed rolls, one of said rolls being hotter than the other roll, being capable of heating the web surface it engages to a temperature above the melt point of the thermoplastic fibers and being positioned to engage the surface of the web opposite the one into which heat was directed during the preheating operation;
A method of autogenously bonding a nonwoven web formed predominantly of thermoplastic fibers and having a basis weight no greater than about 0.0339 kg/m.sup.2 (1 oz./yd..sup.2), characterized by the steps of directing heat into the web from only one surface thereof to preheat the web, and then directing the preheated web through a bonding nip formed in part by a heated roll that is capable of heating the web surface it engages to a temperature above the melt point of the thermoplastic fiber and being positioned to engage the surface of the web opposite the one into which heat was directed during the preheating operation for creating autogenous bonds that, on the engaged surface, are substantially melt bonds penetrating only partially through the web thickness.
A method of making an autogenously bonded web comprising the steps of:
A method of making an autogenously bonded web comprising the steps of:
An autogenously bonded nonwoven web, said web, prior to bonding being weaker in the cross-machine-direction than in the machine-direction, characterized in that the autogenous bonds on one surface include substantially continuous molten bonds extending in a direction, in the plane of the web, for reinforcing the web in the cross-machine-direction, said molten bonds extending only partially through the thickness of the web, said bonded web having a cross-machine-direction wet tensile energy absorption level of at least about 3.15 m-kg/m.sup.2 (80 inch-grams/in.sup.2) and a cross-machine-direction wet tensile strength exceeding 9.83 kg/m (250 gms/in.).
Dependencies are inferred from the claim text.