Book with cover and method and apparatus for making the cover

Details Book with cover and method and apparatus for making the cover Book with cover and method and apparatus for making the cover

1976-11-24

1978-09-05

Skogquist, Harland S.

Books, strips, and leaves

Book, element thereof, or accessory therefor

Covers

B42D 302

Patent

active

041114604

ABSTRACT:
This invention provides an improved book and book cover, and apparatus for making book covers from laminated plastic material where one layer of the laminate is of sufficient stiffness for the front and rear panels of the book cover; and the other layer has good characteristics for hinges for the cover. Both layers are preferably coextruded to make a composite plastic sheet. The apparatus displaces material from the first layer down to the second layer to provide a groove over the hinge layer; and the apparatus is adjustable to make covers for books of different size and thickness. The covers have one layer that heats when exposed to a dielectric field of a predetermined frequency; and the hinge layer undergoes no consequential heating by the dielectric field that heats the first layer.

REFERENCES:
patent: 3168424 (1965-02-01), Sendor
patent: 3228709 (1966-01-01), Tooker
patent: 3318618 (1967-05-01), Mullen
patent: 3345196 (1967-10-01), Goldbeck
patent: 3957287 (1976-05-01), Hall

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