Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – With work feeding or handling means
Patent
1996-01-02
1998-11-10
Lorin, Francis J.
Adhesive bonding and miscellaneous chemical manufacture
Surface bonding means and/or assembly means therefor
With work feeding or handling means
118249, B05D 510, B05C 116
Patent
active
058338047
DESCRIPTION:
BRIEF SUMMARY
The invention concerns the field of papers, in particular cellulose wadding, that is, absorbent paper for sanitary or household uses such as sanitary paper, paper towels, napkins, make-up removers, handkerchiefs or any similar product. Its object is an adhesive coating method and, in particular, a coating method allowing for the depositing of a minimal amount of adhesive to two mutually bonded paper sheets, in particular, made of cellulose wadding.
It is known in the field of sanitary and household papers, when manufacturing products such as sanitary paper, paper towels, and the like, to emboss paper sheets and to bond them to each other using adhesives.
A known procedure consists of embossing each paper sheet on an embossing unit composed of an engraved cylinder and a mating cylinder made of rubber, and in depositing the adhesive using an adhesive applicator onto the embossment of one of the sheets and to join the sheets using a laminator roll. This procedure allows for the creation of empty spaces between the sheets and thus a thick product with increased absorption relative to a sheet which was not embossed. However, the adhesive tends to stiffen the sheet and degrades softness.
U.S. Pat. No. 3,867,225 describes such a procedure wherein the plies are first embossed so as to provide projections of circular or elongated cross-sections and then are combined in such a manner that the projections of one of the plies nest between those of the other ply.
The bonding apparatus described in this patent consists of a combination of three rotary cylinders: a first cylinder drawing adhesive from a receptacle, a second cylinder receiving the adhesive from the first cylinder and transferring a metered amount to a third cylinder which implements adhesive deposition onto the projections of one of the plies. In order to keep the quantity of deposited adhesive within bounds, the third cylinder is engraved in such a manner that it comprises projections which alone are wetted by the second cylinder. As a result, the bonding surface between the two plies is limited to that subtended by the patterns of the projections of the depositing cylinder. In theory, this solution is satisfactory because good bonding is achieved while also controlling the sheet's stiffness. In operation, however, an amalgam composed of adhesive and fibers transferred from the sheet to the cylinder by the adhesion of the residual adhesive forms on the slopes of the projections of the third cylinder. Consequently, the apparatus is quickly fouled and product quality is degraded. Further, there is danger of destroying the rubber cladding by overheating. Therefore, frequent cleaning stops are required. A scraper cannot resolve the problem because it will not scrape the slopes of the projections.
A similar solution is offered in U.S. Pat. No. 3,672,949 to combine the plies not by meshing the projections but by combining tips against tips. In this procedure, the adhesive is deposited in a pattern of crossed lines using a bonding cylinder with corresponding topology.
U.S. Pat. No. 3,961,119 describes a procedure for manufacturing two-ply sheets embossed on cylinders with distinct helical engravings. Mutually parallel ribs are produced on each of the plies. The two plies are combined where the ribs intersect. To prevent bonding the full ply surface in the zone of the engraving flats, projections are provided where the helices of the two cylinders come into contact. Accordingly, the bonding cylinder deposits adhesives only onto the projections. However, aside from the complexity in making such embossing cylinders, this technical solution in practice is unsatisfactory.
The adhesive-depositing cylinder is smooth. It receives adhesive over its entire surface, but transfers adhesive only onto the few zones of the paper which are formed by the projections. Therefore, the residual adhesive on the cylinder surface will dry. Moreover, the cylinder traps dust and fibers, thus tending toward fouling. Fiber and adhesive agglomerates can detach and be dragged along by the s
REFERENCES:
patent: 1124858 (1915-01-01), Caruso et al.
patent: 3867225 (1975-02-01), Nystrand
patent: 4497274 (1985-02-01), Focke
Point Remy
Roussel Gilles
Ruppel Remy
Fort James France
Lorin Francis J.
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