Methods for manufacturing elastic film laminates
AssigneeFitesa Film Products LLC
InventorsStephen D. Bruce, Jeffrey A. Middlesworth
Life of this patent
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Abstract
A method of manufacturing an elastic film laminate includes stretching an elastic film in at least one direction at a first draw ratio, relaxing the elastic film, stretching the elastic film at least once more in the at least one direction at a second draw ratio less than the first draw ratio, and laminating the elastic film to at least one substrate web.
Claims18
A method of manufacturing an elastic film laminate, the method comprising, sequentially:
- initially stretching an elastic film in at least one direction at a first draw ratio;
- relaxing the elastic film so that the elastic film is under a tension in a machine direction suitable to carry and support the elastic film in the machine direction;
- subsequently stretching the elastic film at least once more in the at least one direction at a second draw ratio less than the first draw ratio to a stretched state;
- and
- laminating the elastic film, while in the stretched state, to at least one substrate web after the initial stretching and also following the subsequent stretching at the second draw ratio,
- wherein the first draw ratio is 4:1, and
- wherein the second draw ratio is 3.1:1.
A method of manufacturing an elastic film laminate, the method comprising, sequentially:
- initially stretching an elastic film in at least one direction at a first draw ratio;
- relaxing the elastic film so that the elastic film is under a tension in a machine direction suitable to carry and support the elastic film in the machine direction;
- subsequently stretching the elastic film at least once more in the at least one direction at a second draw ratio less than the first draw ratio to a stretched state;
- and
- laminating the elastic film, while in the stretched state, to at least one substrate web after the initial stretching and also following the subsequent stretching at the second draw ratio,
- wherein the first draw ratio is 5:1, and
- wherein the second draw ratio is 4.5:1.
A method of manufacturing an elastic film laminate, the method comprising, sequentially:
- initially stretching an elastic film in at least one direction at a first draw ratio;
- relaxing the elastic film so that the elastic film is under a tension in a machine direction suitable to carry and support the elastic film in the machine direction;
- subsequently stretching the elastic film at least once more in the at least one direction at a second draw ratio less than the first draw ratio to a stretched state;
- and
- laminating the elastic film, while in the stretched state, to at least one substrate web after the initial stretching and also following the subsequent stretching at the second draw ratio,
- wherein the first draw ratio is 5:1, and
- wherein the second draw ratio is 4:1.
Dependencies are inferred from the claim text.