Abstract: A device for depositing an adhesive substance at one or more predetermined points on wrapping material comprises rotating transfer or applicator disks with irregular profiles including areas destined for transferring the adhesive substance from a tank directly to a corresponding number of predetermined points on the wrapping material. A pair of wiper disks wipe adhesive substance from the two sides of each transfer disk ahead of the position where the adhesive substance is deposited. A dosing collar is interposed between every two wiper disks for dosing and rendering uniform in thickness the adhesive substance on the areas destined to transfer the adhesive substance. The wiper disks and dosing collars are given, in the interaction area with the transfer disks, a movement in a direction opposite to that of the transfer disks.

Abstract: An apparatus for applying latex sealing material to the facing closure flap and opposed body portion of an envelope includes a continuous belt driven conveying means having a generally triangular path, with the envelopes being fed onto the conveying means at one point in the triangle, with the conveying means gripping each of a series of envelopes along its folded edge portion opposite the flap. As the envelopes are conveyed, the flap is first unfolded through an angle of approximately 180.degree. to a generally horizontal position, after which the envelope is passed between an impression roller and a latex applicator roller at which latex is applied to the facing closure flap and the body portion of the envelope. The impression roller and glue roller are disposed at the second point of the triangular path of the conveying means, and next the envelopes are passed through a dielectric dryer for drying the latex sealing material.