US 4,638,757 AGranted

Apparatus for spreading jointing adhesive on a paper web which make one side of a form envelope

AssigneeOplatek Oy

InventorLasse Sandgren

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Abstract

An apparatus for spreading jointing adhesive on each side of a crosswise tear-off perforation on a paper web which makes one side of form envelopes, said apparatus comprising an adhesive spreading roll (2, 2") and a counter roll (6) for passing therebetween said paper web (7) with crosswise tear-off perforations. The periphery of adhesive spreading roll (2) is provided with two parallel arrays of adhesive nozzles (2a) extending longitudinally of the roll. In order to adapt the apparatus to forms of various sizes (to perforation gaps of various lengths), the distance of nozzle arrays (2a) from the center axis of rotation (3) of gluing roll (2) is adapted to be varied either in a manner that there are used several replaceable adhesive spreading rolls (2) having different diameters or in a manner that several nozzle rails (2b, 2c) having different heights can be replaced and fitted in a groove (2d) provided on roll (2').

Claims9

Dependent claims

In an apparatus for applying jointing adhesive to opposite sides of transverse perforations defining tear lines on a paper web, the combination comprising a rotatably mounted adhesive spreading roll;

a rotatable counter roll oppositely disposed to said adhesive spreading roll;
means for passing a paper web having transverse perforations at regular longitudinal intervals between said adhesive spreading roll and said counter roll;
said adhesive spreading roll having two parallel arrays of adhesive dispensing nozzles with adhesive dispensing distal ends extending lengthwise of said adhesive spreading roll for applying adhesive at regular longitudinal intervals to a paper web;
means for supplying adhesive under pressure to said nozzles;
and means for altering the radial distance between the adhesive dispensing nozzle distal ends and the axis of rotation of an adhesive spreading roll in said apparatus whereby the interval between the application of adhesive to a paper web by said parallel arrays of adhesive dispensing nozzles is altered.

2 more elements

Dependencies are inferred from the claim text.