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US 8,043,695 B2Granted
Heat shrinkable foamed sheet
AssigneeAmerican Fuji Seal, Inc.
InventorsOtis Jerome Ballard, Kevin Michael Bickett, Bruce Larry Atcher, Minoru Hasegawa
Life of this patent
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Abstract
In some preferred embodiments, a heat shrinkable foamed sheet has a foamed layer (2) constituting a core layer, and a non-foamed layer (3) constituting a surface skin layer integrally formed on the formed layer. The non-foamed layer (3) is less than about 1.55 μm in maximum surface smoothness measured in accordance with ISO8791-4. Alternatively, by regulating various dimensions of foam cells formed in the foamed layer (2) so as to fall within predetermined ranges, a heat shrinkable foamed sheet excellent in surface smoothness and printing nature can be obtained.
Claims44
A heat shrinkable foamed sheet, comprising:
- a foamed layer constituting a core layer;
- and
- a non-foamed layer constituting a surface skin layer integrally formed on the foamed layer,
- wherein the non-foamed layer is less than about 1.55 μm in maximum surface smoothness measured in accordance with ISO8791-4, and
- wherein cells in the foamed layer have an aspect ratio of length to height of 11.0 to 15.7 in a machine direction.
2 more elements
A heat shrinkable foamed sheet, comprising:
- a foamed layer constituting a core layer;
- and
- a non-foamed layer constituting a surface skin layer integrally formed on the foamed layer,
- wherein the foamed layer is less than about 20.4 μm in average equivalent diameter of
- foamed cells formed in the foamed layer in a cross-section taken along an extrusion direction of the foamed layer and less than about 20.0 μm in average equivalent diameter of foamed cells formed in the foamed layer in a cross-section taken along a direction perpendicular to the extrusion direction, and
- wherein cells in the foamed layer have an aspect ratio of length to height of 11.0 to 15.7 in a machine direction.
3 more elements
A heat shrinkable foamed sheet, comprising:
- a foamed layer constituting a core layer;
- and
- a non-foamed layer constituting a surface skin layer integrally formed on the foamed layer,
- wherein the foamed layer is less than 231.5 μm in average length of a foamed cell of the
- foamed layer in a cross-section taken along an extrusion direction of the foamed layer, and
- wherein cells in the foamed layer have an aspect ratio of length to height of 11.0 to 15.7 in a machine direction.
3 more elements
A heat shrinkable foamed sheet, comprising:
- a foamed layer constituting a core layer;
- and
- a non-foamed layer constituting a surface skin layer integrally formed on the foamed layer,
- wherein the average height of the foamed cells formed in the foamed layer in a cross-section taken along an extrusion direction of the foamed layer is less than about 15.0 μm and the average height of the foamed cells formed in the foamed layer in a cross-section taken along a direction perpendicular to the extrusion direction of the foamed layer is less than about 15.2 μm, and
- wherein cells in the foamed layer have an aspect ratio of length to height of 11.0 to 15.7 in a machine direction.
2 more elements
A heat shrinkable foamed sheet, comprising:
- a foamed layer constituting a core layer;
- and
- a non-foamed layer constituting a surface skin layer integrally formed on the foamed layer,
- wherein the foamed layer is less than about 2,511.6 μm2/cell in average area of foamed cells formed in the foamed layer in a cross-section taken along an extrusion direction of the foamed layer and the foamed layer is less than about 970.7 μm2/cell in average area of foamed cells formed in the foamed layer in a cross-section taken along a direction perpendicular to the extrusion direction of the foamed layer, and
- wherein cells in the foamed layer have an aspect ratio of length to height of 11.0 to 15.7 in a machine direction.
2 more elements
A heat shrinkable foamed sheet, comprising:
- a foamed layer constituting a core layer;
- and
- a non-foamed layer constituting a surface skin layer integrally formed on the foamed layer,
- wherein the foamed sheet is less than about 468.7 μm in average circumferential length of foamed cells of the foamed layer in a cross-section taken along an extrusion direction of the foamed layer, and
- wherein cells in the foamed layer have an aspect ratio of length to height of 11.0 to 15.7 in a machine direction.
2 more elements
A heat shrinkable foamed sheet, comprising:
- a foamed layer constituting a core layer;
- and
- a non-foamed layer constituting a surface skin layer integrally formed on the foamed layer,
- wherein the foamed layer exceeds about 195.5 cells/mm2 in average number of foamed cells formed in the foamed layer per unit area in a cross-section taken along an extrusion direction of the foamed layer, and
- wherein cells in the foamed layer have an aspect ratio of length to height of 11.0 to 15.7 in a machine direction.
2 more elements
A heat shrinkable foamed sheet, comprising:
- a foamed layer constituting a core layer;
- and
- a non-foamed layer constituting a surface skin layer integrally formed on the foamed layer,
- wherein the foamed layer is about 167.0 μm or less in average length of foamed cells of the foamed layer in a cross-section taken along an extrusion direction of the foamed layer, about 342.1 μm or less in average circumferential length of foamed cells of the foamed layer in the cross-section taken along the extrusion direction of the foamed layer, and about 349.5 cells/mm2 or more in average number of foamed cells formed in the foamed layer per unit area in the cross-section taken along the extrusion direction of the foamed layer, and
- wherein cells in the foamed layer have an aspect ratio of length to height of 11.0 to 15.7 in a machine direction.
2 more elements
A heat shrinkable foamed sheet, comprising:
- a foamed layer constituting a core layer;
- and
- a non-foamed layer constituting a surface skin layer integrally formed on the foamed layer,
- wherein the foamed layer is about 66.2 μm or less in average length of foamed cells of the foamed layer in a cross-section taken along a direction perpendicular to an extrusion direction of the foamed layer, about 138.0 μm or less in average circumferential length of foamed cells of the foamed layer in the cross-section taken along the direction perpendicular to the extrusion direction of the foamed layer, and exceeds about 647.9 cells/mm2 in average number of foamed cells formed in the foamed layer per unit area in the cross-section taken along the direction perpendicular to the extrusion direction of the foamed layer, and
- wherein cells in the foamed layer have an aspect ratio of length to height of 11.0 to 15.7 in a machine direction.
2 more elements
A heat shrinkable foamed sheet, comprising:
- a foamed layer constituting a core layer;
- and
- a non-foamed layer constituting a surface skin layer integrally formed on the foamed layer,
- wherein the average equivalent diameter of the foamed cell in the cross-section taken along the extrusion direction of the foamed layer is about 17.1 μm or less and the average equivalent diameter of the foamed cell in the cross-section taken along the direction perpendicular to the extrusion direction is about 18.4 μm or less,
- wherein the average length of the foamed cell of the foamed layer in the cross-section taken along the extrusion direction of the foamed layer is about 167.0 μm or less and the average length of the foamed cell of the foamed layer in the cross-section taken along the direction perpendicular to the extrusion direction of the foamed layer is about 66.2 μm or less,
- wherein the average height of the foamed cells formed in the foamed layer in the cross-section taken along the extrusion direction of the foamed layer is about 12.0 μm or less and the average height of the foamed cells formed in the foamed layer in the cross-section taken along the direction perpendicular to the extrusion direction of the foamed layer is about 11.6 μm or less,
- wherein the average area of the foamed cells in the cross-section taken along the extrusion direction of the foamed layer is about 1,462.0 μm2/cell or less and the average area of the foamed cells in the cross-section taken along the direction perpendicular to the extrusion direction of the foamed layer is about 549.0 μm2/cell or less,
- wherein the average circumferential length of the foamed cells of the foamed layer in the cross-section taken along the extrusion direction of the foamed layer is about 342.1 μm or less and the average circumferential length of the foamed cells of the foamed layer in the cross-section taken along the direction perpendicular to the extrusion direction of the foamed layer is about 138.0 μm or less,
- wherein the average number of the foamed cells formed in the foamed layer per unit area in the cross-section taken along the extrusion direction of the foamed layer is about 349.5 cells/mm2 or more and the average number of the foamed cells formed in the foamed layer per unit area in the cross-section taken along the direction perpendicular to the extrusion direction of the foamed layer exceeds about 647.9 cells/mm2, and
- wherein cells in the foamed layer have an aspect ratio of length to height of 11.0 to 15.7 in a machine direction.
7 more elements
Dependencies are inferred from the claim text.