Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1990-11-01
1993-04-27
Lesmes, George F.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
428289, D04H 158
Patent
active
052060810
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an absorbent and heat insulating fiber slab which comprise cellulose fibers bound together by means of an inorganic flame-proof binder.
By flame-binder is meant here a binder which can only be ignited with difficulty and which is self-extinguishing.
One important advantage afforded by cellulose-fiber based slabs is that the fibers do not present a health hazard, as opposed to asbestos fibers, mineral wool fibers and glass wool fibers for instance, which must be handled with extreme caution when in a free, unbound state. Distinct from fibers of this last mentioned kind, cellulose fibers are also suited for transportation with the aid of pneumatic devices and are able to pass through transporting fans without being hacked into small pieces.
It is known to impregnate cellulose fibers with, for instance, a solution of water glass and to press the resultant mass into a compact sheet or web.
Such sheets, however, to a large extent lack sound absorbing and heat insulating properties and are unable to fulfill the intended function in, for instance, prefabricated building elements or wall structures, mainly because the originally flexible fibers are so tightly packed together, and so impregnated with binder as to become totally rigid. Consequently, it is a prime object of the present invention to provide a fiber slab or a fiber mat of the kind defined in the introduction in which the individual fibers are, to a large extent, joined to one another by punctiform adhesive bonds, and in which said individual fibers have not been impregnated with binder and retain a high degree of mobility in the formed slab and therewith the ability to convert acoustic energy to thermal energy, and in which the fibers enclose air inclusions therebetween, such as to be heat insulating.
This object is realized to the full with the inventive fiber slab or fibre web defined in the claims, and described hereinafter with reference to the accompanying drawings, in which
FIG. 1 illustrates plant machinery for manufacturing the inventive slabs;
FIG. 2 illustrates in larger scale a slab forming chamber and a blower section co-acting therewith;
FIG. 3 illustrates the capillary effect utilized in forming the stable, open structure or fiber matrix; and
FIG. 4 is a simplified illustration of the construction of the fiber matrix .
FIG. 1 is a simplified illustration of plant machinery according to the invention. It is assumed in the following description that the inventive slabs are formed from a cellulose-fiber starting material, fluff, this material optionally being formed into continuous lengths which are subsequently cut, e.g. sawn into slabs of desired length measurements. Referring to the plant machinery illustrated in FIG. 1, in the manufacture of a continuous cellulose fiber web, cellulose fibers (fluff) are fed into a cyclone 1, through an infeed opening 2, and are then introduced into a mixer 3, where the fibers are mixed with air. The fiber/air mixture is passed from the mixer 3 to a portioning or metering unit 4, which dispenses said mixture in given quantities per unit of time, with the aid of a feed screw not shown. The metered quantities of fiber mass are drawn by suction into a conduit 6 connected to the inlet side of a fan 5, and are transported in the form of a suspension through a further conduit 7 to an elongated, tapering accelerating nozzle 8, from where the mass or suspension enters a forming chamber 9. During the passage along the tapering accelerating nozzle 8, the individual fibers in the suspension are imparted kinetic energy of such high value that when exiting from the nozzle 8, the fibers will enter the forming chamber 9 in an essentially rectilinear movement path. The top and bottom surfaces of the forming chamber 9 are defined by two substantially mutually parallel air permeable, endless belts 10 and 11. The belts 10 and 11 extend over rollers 12, 13, 14, 15, 16 and 17, of which at least the rollers 13 and 16 are driven, for instance by the motor 18 which drives the belt 10. The belts 1
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Lesmes George F.
Raimund Chris
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