Books – strips – and leaves – Book – element thereof – or accessory therefor – Covers
Patent
1974-06-18
1976-04-27
Schnall, Jerome
Books, strips, and leaves
Book, element thereof, or accessory therefor
Covers
156212, 156257, 156272, 156273, 264295, B42D 100
Patent
active
039530566
ABSTRACT:
For binding books with plastic covers, this invention cuts the covers from plastic stock such as calendered sheets or continuous webs; and the plastic is preferably one that can be cut from the stock with a die used with a high frequency electromagnetic field for softening the plastic. In the preferred method, a tear line is formed around the outline of the cover and the cover is torn from the sheet with a smooth tear. The leaves constituting the filler for the book are assembled, stabilized with adhesive and then trimmed before assembly with the cover. With plasticized covers, provision is made for preventing migration of the plasticizer into the adhesive with possible resulting loss of strength of the adhesive. By using electromagnetic adhesive to stabilize the filler, the adhesive can be activated by an alternating electromagnetic field when desired to secure the filler to the spine portion of the cover.
REFERENCES:
patent: 2393541 (1946-01-01), Kohler
patent: 2478132 (1949-08-01), Schade
patent: 3088753 (1963-05-01), Sendor
patent: 3093396 (1963-06-01), Segreto
patent: 3168424 (1965-02-01), Sendor
patent: 3454694 (1969-07-01), Delaire et al.
patent: 3730806 (1973-05-01), Heller et al.
Bookwrights, Inc.
Schnall Jerome
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