Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – With work cooling means
Patent
1997-06-11
1998-11-24
Sells, James
Adhesive bonding and miscellaneous chemical manufacture
Surface bonding means and/or assembly means therefor
With work cooling means
156501, 156555, 156582, B32B 3130
Patent
active
058401520
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to apparatus for joining a first web of plastic material to a second web of absorbent material which comprises a cooling-roll, a counter-roll, and means for feeding the first and the second webs through the roll nip so as to press the webs together, wherein the plastic material in the first web is in a plastic state at the time of entering the nip. The invention is particularly intended for the manufacture of starting material for a two-layered surgical drape which comprises an upper layer of absorbent material and a bottom layer of plastic material that has provided on the underside thereof a pattern of outwardly extending projections.
One problem encountered in the design of such apparatus resides in achieving uniform cooling over the whole of the outer cylindrical surface of the cooling-roll, particularly when the cooling-roll is, at the same time, constructed to achieve vacuum forming of the first web and thus includes on its mantle surface a pattern of air-permeable moulds which coact with a vacuum box mounted disposed in the interior of the cooling-roll. It is difficult to provide such cooling-rolls with both cooling channels and suction channels without influencing the function of the arrangement in a negative sense. Furthermore, surgical drapes are produced in several different sizes, and it is therefore desirable to be able to change the pattern roll in such apparatus without undue difficulty. The plastic layer, or sheet, of such surgical drapes is also intended to form a liquid barrier, and it is therefore desirable that the manufacturing process will enable an imperviousness check to be carried out on the manufactured composite web.
SUMMARY OF THE INVENTION
An object of the present invention is to solve the aforesaid problems and to satisfy the aforesaid desiderata. In accordance with the invention, this object is achieved with an arrangement of apparatus the kind defined in the introduction which is characterized in that the cooling-roll is provided with a pattern of molds having air-permeable bottoms over at least a part of its mantle surface or outer periphery; in that a vacuum box is disposed inwardly of the cooling-roll mantle in the region in which the first web abuts the cooling-roll; and in that cooling means are provided for cooling the mantle of the cooling-roll from outside said roll.
In the case of one preferred embodiment, the cooling means include devices for applying a film of cooling liquid to the peripheral surface of the cooling-roll. Furthermore, the web feed devices are arranged to move the combined webs into abutment with the counter-roll after exiting from the nip defined between the cooling-roll and the counter-roll, and the vacuum box extends in the peripheral direction of the cooling-roll beyond said nip. The cooling-roll comprises a tubular body carried by the counter-roll and at least two further support-rolls which are mutually spaced from one another along the periphery of the tubular body and of which at least one is driven. In the case of one preferred variant, the support-rolls are arranged to apply a film of liquid on the mantle surface of the cooling-roll and part of the peripheral surface of the support-rolls is located in a water bath. The arrangement also includes means for detecting the presence of any liquid that may have been absorbed by absorbent material in the composite web comprised of said combined first and second webs, said means having the form of a moisture content measuring device.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in more detail with reference to the accompanying drawings, in which
FIG. 1 is a schematic, partially cut-away side view of a preferred embodiment of an inventive arrangement; and
FIG. 2 is a schematic view in perspective of a pattern roll forming part of the arrangement shown in FIG. 1.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The arrangement illustrated in FIG. 1 includes a metal cooling-roll 1, for instance made of bronze or steel
REFERENCES:
patent: 2607712 (1952-08-01), Sturken
patent: 2690206 (1954-09-01), Mueller
patent: 3294613 (1966-12-01), Eichler
patent: 3598681 (1971-08-01), Jeppsson et al.
patent: 3658617 (1972-04-01), Fearnow et al.
patent: 4556527 (1985-12-01), Sarcander
patent: 4576669 (1986-03-01), Caputo
Billgren Thomas
Leclercq Maurice
Robert Francis
Molnlycke AB
Sells James
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