Oriented polymeric articles and method
First Claim
1. A method of forming layered arrays of fiber elements comprising:
- forming a polymeric film havinga body having a first surface and a second surface and having a longitudinal dimension, anda plurality of elongate microstructured surface features disposed on the first surface of the body in a direction substantially parallel to the longitudinal dimension of the body, wherein the microstructured surface features are substantially parallel;
stretching the polymeric film in a direction substantially parallel to the longitudinal dimension of the body;
separating the stretched polymeric film along generally longitudinally disposed separation lines to define a plurality of discrete fiber elements, wherein one or more of the fiber elements have at least one microstructured surface feature thereon;
arranging a first layer of the discrete fibers elements in an array of fiber elements so that the longitudinal dimensions of the fiber elements of the first layer are aligned in a first direction wherein the longitudinal dimensions of the fiber elements of the first layer are substantially parallel; and
overlaying the first layer with a second layer of the discrete fiber elements defined by another array of fiber elements so that the longitudinal dimensions of the fiber elements of the second layer are aligned in a second direction wherein the longitudinal dimensions of the fiber elements of the second layer are substantially parallel.
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Abstract
Stretched articles, such as oriented polymeric films or fibers, having microstructure features on at least one surface thereof, and processes for making such articles, are disclosed. A method of making fibers comprises forming a polymeric film having a body having a first surface and a second surface and having a longitudinal dimension. The film also comprises a plurality of elongate microstructure features disposed on the first surface of the body in a direction substantially parallel to the longitudinal dimension of the body, wherein the elongate microstructure features are substantially parallel. The method further comprises stretching the polymeric film in a direction substantially parallel to the longitudinal dimension of the body, and fibrillating the stretched polymeric film along the longitudinal dimension of the body to provide one or more fibers, wherein each fiber has at least one microstructure feature thereon.
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Citations
20 Claims
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1. A method of forming layered arrays of fiber elements comprising:
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forming a polymeric film having a body having a first surface and a second surface and having a longitudinal dimension, and a plurality of elongate microstructured surface features disposed on the first surface of the body in a direction substantially parallel to the longitudinal dimension of the body, wherein the microstructured surface features are substantially parallel; stretching the polymeric film in a direction substantially parallel to the longitudinal dimension of the body; separating the stretched polymeric film along generally longitudinally disposed separation lines to define a plurality of discrete fiber elements, wherein one or more of the fiber elements have at least one microstructured surface feature thereon; arranging a first layer of the discrete fibers elements in an array of fiber elements so that the longitudinal dimensions of the fiber elements of the first layer are aligned in a first direction wherein the longitudinal dimensions of the fiber elements of the first layer are substantially parallel; and overlaying the first layer with a second layer of the discrete fiber elements defined by another array of fiber elements so that the longitudinal dimensions of the fiber elements of the second layer are aligned in a second direction wherein the longitudinal dimensions of the fiber elements of the second layer are substantially parallel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification