Coextruded articles, dies and methods of making the same
Assignee3M Innovative Properties Company
InventorsRonald W. Ausen, William J. Kopecky
Life of this patent
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Abstract
Coextruded articles comprising first and second layers each having first and second opposed major surfaces and between the first and second layers a series of first walls providing a series of microchannels, and methods for making the same. Embodiment of coextruded articles described herein are useful, for example, in cushioning applications where high levels of compression are desired.
Claims15
A coextruded article comprising first and second layers each having first and second opposed major surfaces and between the first and second layers a series of first walls providing a series of microchannels, wherein there are at least 5 first walls per centimeter, wherein each wall has a height extending from the first layer to the second layer, wherein for each wall there is a first average width along the first 2 percent of the height of the wall, wherein for each wall there is a second average width along the last 2 percent of the height of the wall, wherein for each wall there is a third average width along the remaining 96 percent of the height of the wall, and wherein for at least 50 percent by number of the walls, the first average widths are less than the third average widths.
A coextruded article comprising first and second layers each having first and second opposed major surfaces and between the first and second layers a series of first walls providing a series of microchannels, wherein there are at least first walls per centimeter, wherein each wall has a height extending from the first layer to the second layer, wherein for each wall there is a first average width along the first 2 percent of the height of the wall, wherein for each wall there is a second average width along the last 2 percent of the height of the wall, wherein for each wall there is a third average width along the remaining 96 percent of the height of the wall, and wherein for at least 50 percent by number of the walls, the first average widths are less than the third average widths, wherein there are demarcation lines between the walls and the first and second layers.
A coextruded article comprising first and second layers each having first and second opposed major surfaces and between the first and second layers a series of first walls provide a series of microchannels, wherein there are at least 5 first walls per centimeter, wherein each wall has a height extending from the first layer to the second layer, wherein each wall has an average width along its respective height, wherein no width of a wall exceeds more than ±20 percent of the average width for that wall, wherein there is an average width of the walls, and wherein no average width of a respective wall exceeds more than 5 percent of the average width of the walls.
Dependencies are inferred from the claim text.