Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – With bending – folding – winding – or wrapping means
Patent
1998-05-26
2000-04-25
Yao, Sam Chuan
Adhesive bonding and miscellaneous chemical manufacture
Surface bonding means and/or assembly means therefor
With bending, folding, winding, or wrapping means
156580, 156209, 156290, B32B 3108, B32B 3120
Patent
active
060532327
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. 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.
2. 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.
An embossing and laminating device and a method of the conventional type are described, for example, in U.S. Pat. No. 3,414,459. The device described therein has completely identical and symmetrical embossing cylinders, with protuberances aligned in lines parallel to the axes of the corresponding cylinders. To overcome certain disadvantages of this device, EP-B-0,370,972 describes an embossing machine in which the cylinders are completely symmetrical with respect to each other and the protuberances are aligned in lines, all of which are inclined with respect to the axes of the corresponding cylinders.
The embossing cylinders of these known devices (called tip-to-tip machines) are symmetrical and must be perfectly in phase, in such a way that in the area of their closest approach, where they are virtually in contact with each other at the positions of their protuberances and where the two layers are joined by pressure and gluing, there is an exact correspondence between all the protuberances of one cylinder and the corresponding protuberances of the other cylinder. Essentially, the protuberances of one cylinder are disposed in a right-hand spiral and the protuberances of the other are disposed in a left-hand spiral, the spirals having equal and opposite inclinations with respect to the axes of the corresponding cylinders. In this way a strip product is obtained, in which the protuberances of one layer coincide with those of the other layer and adhere to them, when one set of protuberances has been pressed against the 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 joined to each other in restricted areas and not over the whole area of the strip.
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 two layers to be joined and laminated are made to pass. Thus there are small areas on both embossing cylinders in which the protuberances are subjected to mechanical and compressive 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).
In embossing machines of the tip-to-tip type, the two embossing cylinders are kept exactly in phase and are adjusted so as to keep the protuberances of one cylinder always exactly in phase with the protuberances of the other cylinder. For this purpose, the two cylinders are connected mechanic
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 96/00238 International Search Report.
Fabio Perini S.p.A.
Yao Sam Chuan
LandOfFree
Embossing and laminating machine with embossing cylinders having does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Embossing and laminating machine with embossing cylinders having, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Embossing and laminating machine with embossing cylinders having will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-985723