DE2113472A1 - Drying impermeable carpeting - with air flow impinging longitudinally and moving transversely across strip - Google Patents

Abstract

Method for drying strip material esp material impermeable to air, e.g. carpeting coated on one side, uses hot air blown onto the strip, then recycled to the blower. The air leaving the blower is projected onto the strip only along a narrow band parallel to its longitudinal direction; from there it spreads transversely to one or both of the edges of the strip. optionally at increasing speed. In a prefd. appts. the carpeting is conveyed around a suction drum, the air striking the carpet at a central longitudinal slot and being guided transversely across it by a plate extending across the drum.

Description

VEPA AG V 449

Basel, Switzerland

Leiiaenstrasse 21 16-3-1971

"Method and device for drying air in particular by 1 äs s ig_en _o der _s ^c ilY: ^e .E._i.V ^l ^ t ^ üi Ghtl ^ äs si g_e η __Gü tern ^ _

The invention relates to a method and a device for drying particularly air-impermeable or difficult to airborne goods such as B. one-sided coated carpets or the like with heated on the web-shaped material blown air, the side of the goods back to a pressure generating Fan is returned to the air circuit.

There are several known devices with nozzles arranged across the width of the web, through which they operate at increased speed the heated drying air over the entire width of the goods bounces. The removal of the air is z. B. guaranteed by .transversely to the web, opposite the Viarenbahn if necessary covered air duct into which the treatment air flows in from the side and through which the air can escape over both sides of the Viarenbahn.

The efficiency of such an air duct has not proven to be sufficiently proven. The air hits the goods at high speed, but it does not absorb enough moisture n.it, perhaps because of the strong deflection after uora contact with the goods, in order to be in the separately provided air discharge.-jkan'ile to get.

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The invention is based on the object of an air duct system to develop, with which a lower-loss air flow, In particular, air removal is guaranteed in order to achieve a higher evaporation capacity per unit area of the goods to be able to.

The new air duct system is seen in the fact that the fan conveyed air is only fed to a strip that is narrow in relation to the width of the goods and aligned parallel to the longitudinal direction of the goods and from there, if necessary, under Increase in air speed parallel to and across the Viarenbahn via the edge of which is discharged towards the fan. In contrast to the previously usual method, in which the air is fed over the entire width of the web of material, is now the air conveyed by the fan is only fed over a narrow strip of the total width of the goods, from there approximately vertically to be guided towards the transport direction parallel to the material web to the fan. This measure has the consequence that the air with high, possibly even increasing due to a nozzle effect Speed is forced into intimate contact with the goods and at the same time back to the fan either only over one edge or even over both edges without any flow losses due to any resistance flows off.

Any desired device can be used as the device for carrying out this method Serving drying device, which is in a thermally insulated housing with a leading the web-shaped material, preferably sieve-shaped transport base is provided, which is assigned a fan on the front side and a heating device. The material web is then used to achieve the new type of air flow except at a square gap over the longitudinal direction of the goods with a small distance from the Weirenbahn against the air flow to be covered by an air guide plate or the like. Since the web is now completely in contrast to the usual handling Covered against the air supply over the largest part of its width is ,, the air is forced through the narrow gap left on the material web and from there parallel to it to flow back to the fan. The Abateind of Lutt

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guide plate to the goods should only be of small extent, so that the flowing air in the annular space thus created will assume a high speed, which may be by a nozzle-like arrangement of the sheet metal can be reinforced.

The blow-out cross-section of the fan is expediently with the gap provided in the middle of the material web if possible connected by an air duct, thus also through this any undesirable air turbulence above the web can be prevented.

A particularly advantageous device for carrying out the method according to the invention is intended here in addition to a tenter frame a sieve drum dryer called v / earth, on whose sieve drum the web-shaped material through the inside of the rotating sieve drum prevailing induced draft is held. The space for guiding the drying air could for example be created thereby be that the air guide plate is approximately centrally round except for the narrow gap across the width of the web around the drum shell surface covered by the good with a small distance extends. To generate the pressure difference, to generate the air speed, the Sieve drum a fan but such a fan can also be provided on both end faces. Are two fans on a sieve drum provided, the air from both fans expediently flows against each other up to the middle of the drum in air ducts, around the middle of the drum through a gap in the cover to hit the web and from there again to flow back into the suction nozzle of the fans.

In the drawing, exemplary embodiments of the device are shown of the invention shown. The technical features described and also shown on the basis of these figures are intended for themselves and also have inventive significance in combination with one another. Show it:

Figure 1 shows a section along a sieve drum dryer,

Figure 2 shows a section along the line II-II of Figure 1,

209838/0568

FIG. 3 shows a section similar to that according to FIG. 2 with a different air return and

FIG. 4 shows a section through a sieve drum dryer with a sieve drum with a fan arrangement on both sides.

The sieve drum machines shown consist of a heat-insulated housing denoted by 1, which is divided by a wall 2 into a ventilator space 3 with the ventilator 4 and into a treatment space 5 with the sieve drum 6 rotatably mounted therein. If several screening drums are arranged one behind the other, they alternately carry the product through the dryer housing 1. Another product guidance, where the product only rests on one W side, is also conceivable.

The new air duct can, on a Siebtroinmelmaschine with a be provided both upwards and downwards or with a fan 4 that blows off only in one direction. In In the exemplary embodiments, the fan 4 only blows in one direction via Ileizregister 7 in an air duct 8, which extends up to about the bottom of the sieve drum 6 over this extends and in the area of a narrow gap 9 compared to the width of the goods, the conveyed air on the web Io blows. The air conveyed by the fan 4 can be independent of the Air duct 8 only go this way, since the Viarenbahn Io k is otherwise covered by an air duct 11 across the width is.

The air guide plate is only a short distance from the material web Io arranged around the screen drum jacket section covered by the material, so that the gap S) is forced to open the material web hitting air through the narrow annular space between the cover plate 11 and the material web Io flow nut. This is also depending 'on the arrangement of the plate 11 relative to the Viarenbahn take place not only with high, but with increasing air speed.

The web of goods Io, which is either only due to the negative pressure within the Siebtronmol on the Siebtromnolmantelfläche; held

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is or possibly additionally by means of the side attacking chains 12, is driven through at high speed dried on it stroking air with high efficiency. After the air has flowed over the edge of the web, it can either, as shown in Figure 2, through the Perforation of the screen drum jacket, which is made wider than the Viarenbahn, flow into the interior of the screen drum 6, or the air flows outside the sieve drum through a gap between the fan intake and the nozzle star of the sieve drum through. The latter is shown in FIG. 3, from which it can also be seen that the air is also at the one opposite the fan Page can flow in through an opening 13 in the end wall of the sieve drum.

FIG. 4 is only intended to additionally show how an air duct with a double-sided arrangement of fans can be made possible on a sieve drum. The gap 9 is expediently always arranged in the groove of the web of material Io, so that now in the embodiment according to FIG In the middle of the web of material Io, a gap 9 for one fan 4 with the air duct 8 and a wider 9 'for the other Fan 4 'is provided with the Luftführuncjskanal 8 *.

^{L INsp} * cr _eo 2 0-9 838/0668

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Claims (9)

VEPA AG V 449 Basel / Switzerland Leimenstr. 21 16-3-1971 P a t e n t a n s prech e 1. Process for drying, in particular, air-impermeable, or goods that are difficult to ventilate, such as B. one-sided coated carpets or the like with heated on the bahnförraige good blown air, the side of the good back to a pressure-generating fan in the air circuit is returned, characterized in that the fan conveyed air overall only at a narrow compared to the width of the goods parallel to the longitudinal direction of the goods aligned strips fed and from there optionally with an increase in the air speed parallel and transversely to The web of material is carried away over its edge edges to the fan will. 2. The method according to claim 1, characterized in that! That the Air to both sides is discharged over both marginal edges of the material web. 3. The method according to claim 1, characterized in that the air only to one side, over a peripheral edge of the Viarenbahn is discharged. 4. Apparatus for performing the method according to claim 1 to 3 with a preferably sieve-shaped transport support guiding the web-shaped material in a heat-insulated housing ■ .lage, which has a fan on the front and this heating device 209838/0568 is assigned, characterized in that the web (lo) except at a narrow gap (9, 9 ^f ) over the Viarenlängsrichtung with a small distance from the web (lo) against the air flow is covered by an air guide plate (11) or the like . 5. Apparatus according to claim 4, characterized in that the Air guide plate (11) for narrowing the air space is arranged obliquely to the web (lo). 6. Apparatus according to claim 4 or 5, characterized in that the gap (9, 9 ¹ ) is provided in the middle of the web (lo). 7. Device according to one or more of claims 4 to 6, characterized in that the exhaust cross section of the fan (4, 4 ¹ ) is connected to the gap (9, 9 ¹ ) by an air duct (8, 8 '). 8. Sieve drum dryer, on the sieve drum of which the web-shaped material is held by the suction force prevailing inside the rotating sieve drum, according to one or more of claims 4 to 7, characterized in that the air guide plate (11) apart from the narrow gap (9, 9 ^f ) extends over the width of the material web (lo) approximately centrally and around the drum jacket surface covered by the material at a small distance. 9. Sieve drum dryer according to claim 8, characterized in that fans on both end faces of the sieve drum (6) (4, 4 ¹ ) are arranged, the conveyed air of which is fed to the gap (9, 9'f) of the middle of the web (lo), optionally ι air ducts (8, 8 '). +) in 2Ü9838 / G568 Blank page