Stock material or miscellaneous articles – Structurally defined web or sheet – Continuous and nonuniform or irregular surface on layer or...
Patent
1996-02-07
1998-04-07
Loney, Donald
Stock material or miscellaneous articles
Structurally defined web or sheet
Continuous and nonuniform or irregular surface on layer or...
428156, 428166, 428172, 428178, 428198, 428219, 428340, 156209, 156290, 156291, 156292, 162109, 162113, 162314, 162362, B32B 300, B31F 122
Patent
active
057362238
DESCRIPTION:
BRIEF SUMMARY
The objects of the present invention are novel multi-layer papers, a device/apparatus and a method for their manufacture.
FIELD OF INVENTION
In particular, the invention concerns household and domestic papers, especially embossed paper based on cotton wadding or creped tissue paper. In this field, there is much interest in high absorption paper also having great softness and good mechanical strength.
BACKGROUND OF THE INVENTION
Already for many years multi-layer papers have been used in this field. As a rule, two or three previously embossed layers are made to slightly bond to one another with adhesive deposited upon the ends of the projections made during embossing.
Presently, two different procedures for embossing, assembly and bonding are used which result in two different structures. A first structure involves two identical embossings on two separate paper plies in order to provide projections on the plies and forming a laminate from these two plies. The projections of the two plies point toward the laminate inside and are bonded to each other at their ends. This procedure implements what is appropriately called a "tip to tip" assembly. Such a procedure, as well as the laminates made by it, are described in U.S. Pat. No. 3,414,459. This procedure in essence allows for making two-layer papers having the structure of FIG. 6 of U.S. Pat. No. 3,414,459. A variation also described in that patent and shown in FIG. 7 consists in sandwiching an unembossed ply between the two embossed ones before bonding the tips.
Another procedure, described in particular in U.S. Pat. No. 3,867,225, also provides a laminate of two embossed plies which are also arranged in such a manner that the projections point inward the laminate whereby the projection ends of one of the two plies are coated with adhesive and the bonding is carried out in a position such that the projections of one ply nest between two projections of the other ply. This is the so-called "nested" structure.
In general and as regards household uses, assemblies of embossed plies of paper are sought which essentially combine softness, pleasant touch, good absorption and good mechanical strength.
OBJECTS AND BRIEF DESCRIPTION OF THE INVENTION
Applicant has done research in this field and now has discovered a novel structure composed of at least three plies of embossed paper. The structure has improved softness because more air is trapped between the paper layers while at the same time mechanical strength is increased.
Accordingly, the present invention proposes a novel structure of multi-layer embossed paper evincing properties heretofore never combined. The invention also relates to a method and apparatus for making these multi-layer papers.
In one of its essential features, the invention concerns a multi-layer paper composed of at least three embossed plies of paper having regularly distributed projections and including two so-called external plies of which the respective projections are placed tip to tip and an embossed third, so-called middle, ply of which the projections nest between the projections of one of the two external plies.
Such a structure simultaneously offers the advantages of the above noted "tip to tip" and "nested" structures without incurring the drawbacks of either one and, in particular, the structure of the invention improves the mechanical strength over that of a simple "tip-to-tip" structure and also improves the softness of a simple "nested" structure.
Accordingly, the multi-layer papers of the invention offer simultaneously good structural stability, good crush resistance whereby they are kindred to nested products, and increased thickness whereby touch and softness are improved.
As regards the multi-layer papers of the invention, the two external plies generally have identical embossings, i.e., they have the same repeat patterns and the same magnitudes. These two plies are arranged symmetrically so that the ends of their projections are mutually opposite.
The projections of the middle ply are nested between the projections of
REFERENCES:
patent: 5382464 (1995-01-01), Ruppel et al.
Loney Donald
River James
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