Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – Automatic and/or material-triggered control
Patent
1998-05-26
2000-03-07
Ball, Michael W.
Adhesive bonding and miscellaneous chemical manufacture
Surface bonding means and/or assembly means therefor
Automatic and/or material-triggered control
156553, 156582, 156209, 156290, B29C 5904
Patent
active
06032712&
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to an embossing and laminating machine comprising a first embossing cylinder with a surface provided with a first set of protuberances, a second embossing cylinder with a surface provided with a second set of protuberances, the said two embossing cylinders forming a nip, and a first and a second pressure roller interacting with the first and the second embossing cylinder respectively; and in which the protuberances of the said first and the said second sets are made in such a way that in the said nip some of the protuberances of the first set coincide with some protuberances of the second set, while other protuberances of the first set are out of phase with corresponding protuberances of the second set.
PRIOR ART
Embossing machines are commonly used for the processing of paper layers in order to form a semi-finished product intended for the production of rolls of toilet paper, rolls of kitchen towels, tissues, paper serviettes, and the like.
A device and a method of the conventional type are described, for example, in EP-B-0,370,972.
These devices are commonly provided with two symmetrical embossing cylinders of the same diameter such that, in the area of closest approach of the two cylinders, where they are virtually in contact with each other, and where two layers are joined by means of pressure and gluing in order to form a composite strip material, there is an exact correspondence between the protuberances of one cylinder and the protuberances of the other cylinder. Basically, the protuberances of one cylinder are disposed according to a right-hand spiral and the protuberances of the other cylinder are disposed according to a left-hand spiral, the spirals having equal but opposite inclinations with respect to the axes of the corresponding cylinders. This produces a strip product in which the protuberances of one layer coincide with those of the other layer and adhere to them, the protuberances being pressed against each other after an adhesive has been applied to the protuberances of one of the layers.
To overcome certain problems which arise when cylinders provided with very small and very closely-packed protuberances are used, it has been proposed (EPA-0,426,548) that two layers should be embossed with different patterns, in other words patterns in which in at least one direction of alignment the protuberances of one layer have a different interval from that of the protuberances disposed in the same direction on the other layer. In this way a strip is obtained in which the layers are in contact with each other in restricted areas and not over the whole area of the strip. In this way, there is the advantage that the two embossing cylinders do not have to be perfectly in phase in order to achieve exact correspondence between all the points, something which is particularly difficult once the dimensions of the points have been reduced.
In practice, only some of the protuberances of one embossing cylinder correspond to the protuberances of the other cylinder in the nip between the two embossing cylinders through which the strip of paper is made to pass in order to join and laminate the two layers from which it is formed. Thus there are areas on both embossing cylinders in which the protuberances are subjected to mechanical stresses (where the layers are joined) and large areas where the protuberances are not subject to stresses (where there is no reciprocal correspondence between the protuberances of the two cylinders).
The pressure exerted on the two layers during lamination between the embossing cylinders is considerable. When, as in EP-A-0,426,548, the areas of contact are reduced, there is a concentration of the stresses, an increase in the specific pressure and consequently a gradual and concentrated crushing of the material constituting the protuberances in the areas of contact.
Indeed, it has been found that the embossing cylinders made to produce a strip material as described in EP-A-0,426,548 deteriorate far more rapidly than conventional embossing cylind
REFERENCES:
patent: 3414459 (1968-12-01), Wells
patent: 3961119 (1976-06-01), Thomas
patent: 4742968 (1988-05-01), Young, Jr. et al.
patent: 5096527 (1992-03-01), Biagiotti
patent: 5667619 (1997-09-01), Alikhan
PCT/IT 96/00240 International Search Report.
Ball Michael W.
Fabio Perini S.p.A.
Tolin Michael A
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