| 摘要 |
A sheet of material ( 21, 61, 81 ) formed for control bending along a bend line ( 23, 63 ) while maintaining a continuous web of material ( 26 ) across the bend line ( 23, 63 ). The sheet has at least one groove ( 22, 62, 82 ) formed therein with a central groove portion ( 24, 64, 84 ) extending in the direction of and positioned proximate to a desired bend line ( 23, 63 ). The groove is formed with a continuous web of material ( 26 ) at a bottom of the groove ( 22, 62, 82 ) and has a configuration defining at least one bending strap ( 27, 67 ) extending across the bending line ( 23, 63 ) at the end of the groove with a centerline ( 28 ) of the bending strap ( 27, 67 ) oriented obliquely across the bend line ( 23, 63 ) so that a balancing of the forces during bending of the web along the central portion ( 24, 64, 84 ) of the grooves and bending of the oblique bending strap occur and control the location of bending of the sheet. A method of preparing a sheet of material ( 21, 61, 81 ) for bending while maintaining a continuous membrane ( 26 ) across the bend line ( 23, 63 ) is also disclosed.
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