Method for subdividing multilayer optical film cleanly and rapidly

The method of applying liners and using laser radiation to cut multilayer optical films addresses delamination issues, ensuring clean cuts and maintaining optical properties, suitable for applications requiring small, uniform pieces.
US20060191630A1Inactive Publication Date: 2006-08-313M INNOVATIVE PROPERTIES CO
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
3M INNOVATIVE PROPERTIES CO
Publication Date
2006-08-31
Estimated Expiration
Not applicable · inactive patent

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Abstract

Polymeric multilayer optical films, and laminate bodies that include such films, are cut or subdivided into one or more discrete pieces by removably applying a first and second liner to opposed major surfaces of the multilayer optical film. Laser radiation is then directed at the multilayer optical film through the first liner in such a way as to produce cut lines that define a plurality of pieces of the first liner and of the multilayer optical film. Thereafter, the plurality of pieces of the first liner are removed from the plurality of pieces of the multilayer optical film while the pieces of multilayer optical film are supported by the second liner. Application of the first liner to the multilayer optical film can be accomplished with electrostatics.
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Description

CROSS REFERENCE TO RELATED APPLICATIONS

[0001] This application is a continuation of U.S. application Ser. No. 10 / 268,118, filed Oct. 10, 2002, which is a continuation-in-part of U.S. application Ser. No. 10 / 152,412, filed May 21, 2002, now abandoned and claims priority thereto.FIELD OF THE INVENTION

[0002] The present invention relates to methods of cutting or subdividing an optical body comprising a multilayer optical film into a plurality of smaller pieces. BACKGROUND

[0003] Multilayer optical films, i.e., films that provide desirable transmission and / or reflection properties at least partially by an arrangement of microlayers of differing refractive index, are known. It has long been known to make such multilayer optical films by depositing a sequence of inorganic materials in optically thin layers (“microlayers”) on a substrate in a vacuum chamber. Typically, the substrate is a relatively thick piece of glass, limited in size due to constraints on the vacuum chamber volume and / ...

Claims

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