Process and apparatus for the production of book covers components
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 4, 1990
Grant Date -
N/A
app pub date -
Nov 1, 1988
filing date -
Jan 15, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In the manufacture of a book cover, a cover sheet is glued to cardboard panels and portions of the sheet are folded around edges of the panels. The glued unit is then passed through a press comprising pairs of press rolls spaced apart in the direction of travel of the glued unit. One roll of each pair contains circumferentially spaced recesses along its outer periphery. The recesses prevent the application of pressing forces to the unit when the recesses reach the unit, whereby an interrupted pressing action is achieved. Each pair of rolls is operated to apply pressing forces to regions of the cover not pressed by the other pair of rolls.
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