Abstract: Multilayer meltblown fibrous webs, as well as apparatus and methods of forming the webs. The webs are produced on a rotating collector that also moves parallel to its longitudinal axis. The webs are thus formed in a helical process, and the resulting tubular web is separated in a direction parallel to a helix angle. By separating the tubular web in a direction parallel to the helix angle, a flat multilayer meltblown fibrous web is provided that allows for incorporation of feathered edges formed during the article's manufacture.
Type:
Grant
Filed:
October 28, 1998
Date of Patent:
October 31, 2000
Assignee:
3M Innovative Properties Company
Inventors:
Michael R. Berrigan, James F. Dyrud, Stanley C. Erickson, Luther E. Erickson
Abstract: Imaging articles and methods are disclosed that use dual-axis retroreflective elements such as 90 degree prisms and linear lenticular elements in which the imaging is either superimposed on the imaged object or displaced therefrom. If the imaging is superimposed on the imaged object, it is accomplished by retroreflection. If the imaging is displaced from the imaged object, it may be accomplished by dual axis retroreflection or retrotransmission.
Type:
Grant
Filed:
February 11, 1999
Date of Patent:
April 25, 2000
Assignee:
Minnesota Mining and Manufacturing Company
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