Method and device for creating a hinge-like bendable zone in a sheet of paper, paperboard, cardboard or foil
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United States of America Patent
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Apr 5, 2011
Grant Date -
Jan 24, 2008
app pub date -
Jul 11, 2007
filing date -
Jul 18, 2006
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a method for producing a hinge-like bend line (3a,b, 4a,b or 5a,b) in a sheet (1) of paper, paperboard, cardboard or foil, particularly a brochure cover, by rotatively driven tools (7.1, 7.2), the bending line (3a,b, 4a,b or 5a,b) is produced by roll bending without scoring the material in the form of a scoring bead. The roll bending is preferably realized by the cooperation of a tool edge (12a) of a first rotary tool member (8.1) with a conical outside surface (11a) of a second rotary tool member (9.1). The roll bending process lowers the bending resistance of the sheet (1) in the region of the bending point (3a,b, 4a,b or 5a,b), wherein the sheet (1) is simultaneously pre-bent in a certain direction along the bending point (3a,b, 4a,b), e.g., in order to take into account the position of the brochure cover on the book block at the spine edges (the sheet is pre-bent inward in a U-shaped fashion).
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