Multiple embossed webs
AssigneeMinnesota Mining and Manufacturing Company
InventorsClyde D. Calhoun, David C. Koskenmaki
Life of this patent
Estimating the term…
Abstract
A carrier web having at least one surface that is multiple, sequentially embossed, wherein depressions created from the prior embossing patterns(s) are preserved during the subsequent embossing pattern(s) even though the subsequent embossing pattern(s) are superimposed on the depressions from the prior embossing pattern(s). The patterns of embossing can be Euclidean or fractal created from machine tools produced using microreplication and other techniques. The carrier webs are useful for release liners for pressure sensitive adhesives and a number of other industrial and consumer applications.
Claims12
A carrier web, comprising:
- at least one surface that has a multiple embossed pattern having a first embossed pattern and a second embossed pattern, wherein the first embossed pattern forms an array of depressions, wherein the depressions of the first embossed pattern are in the second embossed pattern, wherein the second embossed pattern comprises lands and ridges between the lands, and wherein the height of the ridges over the lands ranges from about 3 to about 45 .mu.m.
A method of embossing, comprising the steps of:
- (a) embossing a carrier web having at least one surface with a first pattern, to create a first pattern of depressions;
- (b) embossing the surface with a second pattern, to create a second pattern of depressions comprising lands and ridges;
- wherein the depressions created from the first embossing step are substantially preserved during the second embossing step even though the second embossing step superimposes the second pattern on the depressions created by the first embossing step, and wherein the height of the ridges over the lands ranges from about 3 to about 45 .mu.m.
Dependencies are inferred from the claim text.