Bookbinding: process and apparatus – Process – Of adhesive binding
Patent
1988-10-13
1990-03-20
Bell, Paul A.
Bookbinding: process and apparatus
Process
Of adhesive binding
281 151, 281 211, 412 6, B42B 500, B42C 900
Patent
active
049096931
ABSTRACT:
In a method of joining printed sheets to form a pad by compressing the top of the stacked sheets between the plates of a printed press the sheets are printed on coated paper having sufficient microporosity to retain on the surface the adhesive agents of the ink employed. The sheets are printed with an ordinary ink which polymerizes naturally in air. A pressure of 100 to 250 daN/cm.sup.2 and preferably greater than 150 daN/cm.sup.2 is applied between the press plates over an area reserved for gluing. The microporosity of the paper as measured by the offset test on the I.T.G. machine using Lorilleux 3800 ink gives the following optical density results: after 15 seconds: 0.30 to 0.80; after 60 seconds: 0.10 to 0.60. A plurality of stacked pads separated by heating or heated separators may be pressed simultaneously. The press plates may carry complementary waffle or groove patterning in the area reserved for gluing. The press plates may be covered with a non-stick film which may be a silicone-based product.
REFERENCES:
patent: 3560290 (1971-02-01), Sendor et al.
Bell Paul A.
Calendriers Jean Lavigne
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