Abstract:
A device for applying a liquid as a thin continuous film to a passing workpiece strip has a runoff face and an intake face both extending a full width of the workpiece strip and meeting at an upwardly directed spillover weir. A diverter has a face juxtaposed with the intake face and forming therewith a storage compartment and a lip having a face juxtaposed with the runoff face at the spillover weir. Liquid is fed under pressure to the storage compartment so that the liquid rides up the intake face, over the spillover weir, and down the runoff face to a lower edge thereof whence it drops onto the passing workpiece strip. The lip face blocks any liquid that overshoots the spillover weir and deflects it back onto the runoff face.
Abstract:
The invention relates to a method for generating three-dimensional transparent patterns on a non-woven fabric or similar, whereby, for example, hot air is sucked through openings which form the pattern in the circumferential surface of a drum. The openings are straight or curved gaps instead of conventional holes and together with other openings form the desired pattern. The air or similar, flowing through the gaps, presses the fibres into the gaps and the vacuum on the inner side of the drum sucks said fibres onto the patterning.
Abstract:
A strengthened nonwoven is made at least in part of spun microfibers that are strengthened by hydrodynamic needling, alone or together with other fibers such as also staple fibers and/or endless fibers. The microfibers are spun from a polymer melt of only one certain polymer from a plurality of spinning apertures, and the spun filaments are drawn by gas streams accelerated to high velocity by an accelerating nozzle such as a Laval nozzle and, due to further production conditions, each fiber receives before solidification an internal hydrostatic pressure that is higher than the ambient gas pressure so that each fiber cracks in the longitudinal direction and splits up into a plurality of fine endless filaments.
Abstract:
The invention relates to a device comprising a rotationally mounted drum, which is flown through by a fluid from the exterior to the interior. The stable casing of the drum is provided over the periphery thereof with a sieve-shaped hole structure. The inventive device also comprises permeable outer bellows, which radially cover the casing on the exterior. One more support such as wire gauze is optionally placed between said outer bellows and the sieve drum casing in order to increase the distance between the sieve drum casing and the outer bellows. According to the invention, a tensioning element, which extends in an axial direction and which is enlarged at least once in a radially direction over the working width of the sieve drum, is mounted in a manner that enables it to be axially displaced in order to tension, in any case, the outer bellows with the sieve drum lateral surface between the outer surface of the sieve drum casing and the inner surface of the outer bellows. After the tensioning element is displaced in an axial direction, the outer bellows are brought into frictional contact in an all-over manner with the sieve drum lateral surface whereby preventing the formation of folds in the outer bellows over a long period of time.
Abstract:
A discontinuous nonwoven formed by a carder or other nonwovens formed from filaments have a higher strength in the longitudinal direction than in the transverse direction on account of the longitudinally oriented lengths of fibres after the hydrodynamic needle punching, for example. This situation can be improved if the pre-bonded nonwoven undergoes a reorientation of the fibres, for example, during a lateral stretching treatment. The fibres already intertwined in the nonwoven are at least partially reoriented, for example, in the transverse direction. In this new position another hydrodynamic bonding treatment can then take place in order to fix this new position. In this way, the nonwoven is generally stronger than would be possible without this reorientation of the fibres.
Abstract:
The novel product consists of hydrodynamically bonded non-woven layers of which at least four layers are stacked and are than joined to one another by only using hard water jets.
Abstract:
There are known drum jacket constructions that consist solely of perforated sheet metal. There are also known constructions, which, in order to increase the distance between the drum and the surrounding perforated sheet-metal wire gauze, consist of sheet metal with trusses configured e.g. as sheet-metal rings, or of honeycomb sheet-metal strips that are welded together, or of screwed constructions devoid of welding joints. The simplest solution for increasing said distance is a construction comprising a normal screen drum with struts bent into a U-shape that are screwed to the exterior, whereby the wire gauze lies on the external edges of said struts. Said drum however has a low buckling resistance, which is a required characteristic for the drying of tissue or paper. The novel drum jacket construction thus consists of an intersecting structure of sheet-metal strips, whose rings and strips are provided with corresponding insertion slots. The rings and strips are pushed into one another, so that they are at the same radial height and are screwed together. The free flanks of the insertion slots of the sheet-metal strips and also the sheet-metal ring are interconnected in a fixed manner by at least one respective additional connecting plate, using the screws.
Abstract:
Method and device for producing perforated nonwovens by hydrodynamic needling. A nonwoven with a basically clean hole structure on a drum with plastic elevations can be produced by energy-rich water jets. Depending on the thickness of the fibers used in the nonwoven, however, certain fibers can nevertheless be stretched transversely across a hole. In order to avoid or eliminate this, the perforated nonwoven is subjected to singeing flames after drying.
Abstract:
A device is known for heat treatment of permeable webs of goods with a housing in which at least one screen roller is mounted and a pumping device is associated endwise with the roller, said pumping device drawing a processing medium in the formal of a vapor and/or gas out of the screen roller, with the through-flow area of the roller, in other words the working width of the screen roller, being capable of being determined by a width-adjusting device on the screen roller. A screen roller of this kind is improved according to the invention ifa) at least in the area covered by the web of goods, it has two coaxially mounted permeable screen roller jackets located with a distance between them,b) a width-adjusting device is provided between the outer and inner screen roller jackets, said devicec) being adjustable by a spindle on the axis of the screen roller, andd) the inner screen roller jacket is made permeable only in the area that corresponds to the minimum working width of the roller.A design of this kind is suitable for large differences in working width and also for smaller screen roller diameters without resulting in non-uniform processing over the working width.
Abstract:
In dye applicators that operate by the pouring principle, it is known to store the liquid flowing over an overflow barrier in a liquid supply chamber located in front of it. To produce a dye applicator that can be adjusted to the desired working width, this liquid supply chamber is divided several times by a limiting wall and a liquid supply bore is associated with each of the liquid supply chambers thus formed. The liquid supplied through hoses to the individual supply chambers is distributed stepwise in such fashion that the respective supply openings are connected at both ends in the direction of the working width with first branch lines of the same length, at whose respective ends intermediate outflow openings are provided, to which second branch lines are connected in the same fashion on both sides in the direction of the working width, with said lines being shorter by half of the first branch lines and having a reduced cross section, with the outflow openings provided at the ends for example. According to the invention, the respective first branch lines are located in a plane parallel to that of the outflow openings and the liquid is distributed to the outflow openings through the second branch lines from the plane of the first branch lines to the plane of the outflow openings. In this manner, a fine striped pattern can be produced by dying.