Structure with etchable metal

• US 5,672,407 A
• Filed: 03/15/1996
• Issued: 09/30/1997
• Est. Priority Date: 02/14/1991
• Status: Expired due to Term

• Current Assignee: Graphic Packaging International LLC (Graphic Packaging International Incorporated)
• Original Assignee: Beckett Technologies Corp.
• Inventors: Beckett, D. Gregory
• Primary Examiner(s): WATKINS III, WILLIAM P
• Application Number:
  US08/618,430
• Time in Patent Office: 564 Days
• Field of Search: 428/131, 428/138, 428/457, 428/913, 428/213, 428/596, 428/137, 219/730, 219/728, 426/107, 426/234, 426/243, 99/DIG. 14
• US Class Current: 428/137
• CPC Class Codes: B65D 2581/3467 Microwave reactive layer shaped by delamination, demetallizing or embossing
• CPC Class Codes: B65D 2581/3472 Aluminium or compounds thereof
• CPC Class Codes: B65D 81/3446 specially adapted to be heated by microwaves
• CPC Class Codes: C23F 1/02 Local etching
• CPC Class Codes: H05K 1/0393 Flexible materials H05K1/038 takes precedence; specific organic compositions are classified in H05K1/0313 and subgroups
• CPC Class Codes: H05K 3/061 Etching masks
• CPC Class Codes: H05K 3/068 Apparatus for etching printed circuits
• CPC Class Codes: Y10S 428/913 Material designed to be responsive to temperature, light, moisture
• CPC Class Codes: Y10S 99/14 Induction heating
• CPC Class Codes: Y10T 428/12361 having aperture or cut
• CPC Class Codes: Y10T 428/24273 including aperture
• CPC Class Codes: Y10T 428/24322 Composite web or sheet
• CPC Class Codes: Y10T 428/24331 including nonapertured component
• CPC Class Codes: Y10T 428/2495 Thickness [relative or absolute]
• CPC Class Codes: Y10T 428/31678 Of metal

Abstract

A self-supporting layer of flexible etchable metal having a thickness of about 1 micron has a plurality of apertures formed therethrough and has a layer of etchant resistant material on each face of the metal layer in a pattern completely overlying the metal layer and the periphery of the plurality of apertures.

Claims

1. A novel element, comprising:

a self-supporting flexible layer of aluminum having a thickness of about 1 to about 15 microns, having a first face and a second face and having a plurality of apertures formed therethrough with each said aperture being in registry in each said face,

said plurality of apertures comprising a plurality of elongate slots in said self-supporting flexible layer of aluminum sized and arranged to generate thermal energy when the element is adjacent a foodstuff and exposed to microwave radiation,

a layer of aqueous sodium hydroxide -resistant material adhered to each said face of said self-supporting flexible layer of aluminum in a pattern completely overlying said aluminum layer and defining the periphery of each of said plurality of apertures, and

a layer of dielectric material adhered to and coextensive with each face of said element.

2. The element of claim 1 wherein said dielectric material is selected from the group consisting of polymeric film, paper and paperboard.

3. The element of claim 1 wherein said self-supporting flexible layer of aluminum has a thickness of about 3 to about 10 microns.