Abstract: A method for drying substrates using isopropyl alcohol (IPA) includes: a pre-stage in which heated fluid is injected to a bottom surface of a substrate to raise a temperature of the substrate simultaneously to injection of an organic solvent to a top surface of the substrate and injection of a dry gas to the top surface thereof to improve a vaporization power of the organic solvent; and a final stage in which the injection of the heated fluid is stopped and the organic solvent and the dry gas are injected to the top surface of the substrate.

Abstract: A method for drying a wet semiconductor substrate includes immersing the wet substrate in a rinsing liquid in a sealed drying chamber, producing a volume of vaporized drying fluid in a vapor generator, establishing fluid communication between the vapor generator and the drying chamber, transferring the vaporized drying fluid to the drying chamber by removing the rinsing liquid from the drying chamber, and allowing the vaporized drying fluid to condense on the wet substrate. The method further includes providing vacuum pressure within the drying chamber and backfilling the drying chamber with an inert gas to substantially achieve atmospheric pressure.

Abstract: The present disclosure provides an apparatus for automatically dispensing air, for example, for hand drying, through either a dedicated air only spout (side mount embodiment) or through a multi-use spout configured for dispensing water, soap and/or air. The air drying module, which is typically positioned below a counter, can be modified according to the system needs to operate with hot and/or cold air and to optionally include a filter and/or fragrance dispenser.

Abstract: A substrate drying apparatus includes a drying gas nozzle configured so that, assuming that a surface WA of the substrate W is a projection plane, regarding the drying gas flow Gf in the nozzle moving direction Dr, a collision position Gfw with the substrate W is located downstream of a projected discharge position Gfv?, the projected discharge position Gfv? being a discharge position from the drying gas nozzle projected on the projection plane. In a three-dimensional space, the drying gas flow Gf is inclined, such that an angle ? formed by an axis Ga of the drying gas flow Gf and a vertical line Wp of the substrate W is in a range from a half contact angle ?/2 to an angle determined by deducting the half contact angle ?/2 from 90°, the half contact angle ?/2 being a half of the contact angle ?.

Abstract: A system and process for drying biosolids and wherein nutrients and/or minerals are blended into partially dried biosolids. Further, the system and method compresses the mixture of biosolids and nutrients into a selected form and this is followed by completion of the drying process. In the end, a more uniform and higher value dried biosolids product is produced.

Abstract: An apparatus and method for quickly drying porous materials. A sealable chamber is connected to a cold trap which is connected to a vacuum pump. A sample is placed inside the sealable chamber. The vacuum pump is turned on and air is evacuated through the cold trap to the vacuum pump. An infrared lamp may be used to heat the chamber and sample therein directly or heated air may be allowed to enter the sealable chamber. Air may be drawn directly from the sealable chamber to the vacuum pump bypassing the cold trap. Various parameters may be used to determine if the drying process is complete, including the degree of vacuum achieved in the chamber.

Abstract: A media drying system removes a moistening liquid from a moistened medium having first and second surfaces. A liquid reservoir contains a heating liquid heated above a moistening-liquid boiling point. A rotatable liquid-blocking member has a liquid-blocking layer with an inner surface and an outer surface. A media-transport system transports the medium entrained around the liquid-blocking member so that the first surface of the moistened medium is brought into contact with the outer surface of the liquid-blocking layer. An entrained portion of the moistened medium passes through the liquid reservoir and is submerged in the warmed heating liquid. The heating liquid contacts the inner surface of the liquid-blocking layer so that heat is transferred through the liquid-blocking layer from the warmed heating liquid to the moistening liquid, or heat is transferred from the warmed heating liquid to the second surface of the moistened medium.

Abstract: A hair dryer with conditioning attachment including: a L-shaped body; an emission end; a conditioner attachment end; a conditioner container attached to the conditioner attachment end, where the conditioner container includes a compartment for storing hair conditioner; and a flow of hair conditioner through the emission end during use the hair dryer. The hair dryer may also include control buttons.

Abstract: An internal staged suppression system for suppressing a hazard occurring in a grain dryer includes a plurality of vertical column sections and at least one spray head positioned radially inward within the interior of the grain dryer. The spray head includes a deflector cap that generates a substantially horizontal spray of water sufficient to reach the walls defining the grain columns.

Abstract: A functionalized silica product includes particles of a hydrophobated silica having a thin coating of an emulsion polymer. A ratio of the hydrophobated silica to the emulsion polymer is from about 4/1 to about 50/1. The functionalized silica product is in the form of a friable crumb or a powder that may be mixed into a elastomer formulation for a rubber article, such as a tire component.

Abstract: In a process for the continuous conditioning of gypsum plaster, the gypsum plaster is passed from a calcination facility connected upstream to a gypsum plaster cooler in the form of particles. In the gypsum plaster cooler, soluble calcium sulphate anhydrite is initially converted to calcium sulphate hemi-hydrate and calcium sulphate dihydrate to calcium sulphate hemi-hydrate, and crystal defects are eliminated. Subsequently, the gypsum plaster is brought into contact with ambient air and dehumidified by the latter and thereby simultaneously cooled indirectly.

Abstract: A novel collapsible aeration system is retrofitted into a grain bin with a discharge opening in the bottom. This grain bin may have a sloped or conical hopper or a flat bottom. The aeration system is formed from a set of connected (e.g. hinged) duct sections that define a round or multi-sided duct having a minimum of three sides or faces. The sides may be flat, curved or corrugated. The collapsible aeration system is folded (collapsed), inserted into the bin via a hole, and then unfolded inside the bin. An air duct is connected to the aeration system to enable the aeration system to dry the grain in the grain bin. This technology enables existing grain bins to be retrofitted with a dryer in an easy and efficient manner.

Abstract: A method and apparatus for underwater pelletizing and subsequent drying of crystallizing polymers to crystallize the polymer pellets with out subsequent heating is shown in FIG. 5. High velocity air or other inert gas is injected into the water and pellet slurry line (120) toward the dryer near the pelletizer exit (102) at a flow rate from about 100 to about 175 m3/hour, or more. Such high-speed air movement forms a vapor mist with the water and significantly increases th speed of the pellets into and out of the dryer such that the polymer pellets leave the dryer with sufficient latent heat to cause self-crystallization within the pellets. A valve mechanism in the slurry line (150) after the gas injection further regulates the pellet residence time and a vibrating conveyor after the dryer helps the pellets to achieve the desired level of crystallinity and to avoid agglomeration.

Abstract: The recirculating dryer includes a housing having an operator control panel and a locking door mounted to a side of the housing. A rotating tumbler for holding the laundry to be dried is mounted inside the housing. Heated air is introduced through an inlet of the tumbler, and the outlet is kept closed by a flap. The heated air is recirculated and recycled through the tumbler. The air is reheated back to a predetermined temperature if the temperature falls below a level suitable for drying. A layer of moisture-absorbent material surrounds the tumbler to absorb the moisture gathered in the air from the drying process. At drying completion, the flap is opened to vent the used air. A control system controls various features with data from a thermostat and a moisture detector.

Abstract: A substrate drying apparatus includes a drying gas nozzle configured so that, assuming that a surface WA of the substrate W is a projection plane, regarding the drying gas flow Gf in the nozzle moving direction Dr, a collision position Gfw with the substrate W is located downstream of a projected discharge position Gfv?, the projected discharge position Gfv? being a discharge position from the drying gas nozzle projected on the projection plane. In a three-dimensional space, the drying gas flow Gf is inclined, such that an angle ? formed by an axis Ga of the drying gas flow Gf and a vertical line Wp of the substrate W is in a range from a half contact angle ?/2 to an angle determined by deducting the half contact angle ?/2 from 90°, the half contact angle ?/2 being a half of the contact angle ?.

Abstract: The invention relates to a method and a system for cooling torrefied material, including, applying water to the torrefied material to quench-cool the material and thereafter further cooling the torrefied material and at least part of the torrefaction gases released from the material in a common cooling device, such that components of the torrefaction gases condenses on the torrefied material within the common cooling device.

Abstract: The present invention refers to a hand dryer which, in addition to drying the hands by means of a warm air exit, also propels a sprayed germicidal or bactericidal liquid, or any other personal hygiene product. Additionally, the dryer incorporates an air freshener for emitting scents. In order to do so, it comprises a housing (1) with a separation wall (2) which separates the elements participating in the hand dryer and an isolated and independent zone in which a scent evaporation air freshener (4) participates; where a duct coming from a germicidal or bactericidal liquid container (7) ends in the warm air exit zone. In the zone where the evaporation air freshener is established, a heating element (18) for evaporating the scent is established.

Abstract: A hand dryer has a housing and at least one exit opening communicating with an interior of the housing. At least one blower motor is arranged in the interior of the housing and conveys an air stream through the at least one exit opening to the exterior of the hand dryer. A supply device with at least one discharge opening is provided, wherein the supply device is configured to supply a disinfectant to the air stream through the at least one discharge opening.

Abstract: Systems and methods are described for conductively heated vacuum-based drying of portable electronic devices. For example, a portable electronic device that has been exposed to excessive liquid is placed inside a drying chamber. The drying chamber is closed and a drying routine commences. During the drying routine, the chamber is pressurized to a vacuum level sufficient to gasify liquids inside the device, and the device is conductively heated at least to replace latent heat of vaporization lost during the pressurization. Some embodiments include techniques relating to payment processing, monitoring and feedback control, decontamination, and/or other functionality.

Abstract: A system includes a multi-feeder assembly. The multi-feeder assembly includes a first solids feeder, a liquid removal section, and a second solids feeder. The first solids feeder is configured to receive a solids flow from an upstream system. The liquid removal section is configured to reduce an amount of liquid in the solids flow. The second solids feeder is configured to receive the solids flow in series with the first solids feeder and output the solids flow to a downstream system.

Abstract: A biomass drying system includes a rotary biomass dryer that includes a helically threaded auger shaft rotatably driven by a prime mover, such as an electric motor. No external source of heat is required to dry a wet biomass material that is supplied to an input of the biomass dryer. Instead, the helical threads on the shaft have a variable width, designed to gradually increase the compression applied as the biomass material is advanced through a generally cylindrical bore in the biomass dryer. A variable compression nozzle is disposed at a distal end of the bore and can be adjusted to achieve a desired level of a parameter such as the moisture content of the dried biomass material produced by the system. The variable compression nozzle, which can be automatically controlled, includes longitudinally extending segments that are forced radially inwardly to increase the compression force applied to the biomass material.

Abstract: A multiple purpose hair dryer is disclosed. The multiple purpose hair dryer may provide hot or cold air that circulates through a top portion and a bottom portion of an elongated head. The multiple purpose hair dryer may include a plurality of upward bristles and a plurality of downward bristles that intersect alongside each other when the top portion and the bottom portion are clamped together producing a round-brush effect.

Abstract: The purpose of the present invention is to make it possible to reuse drying retardant which was used for supercritical drying.

Abstract: The industrial tumble dryer comprises a casing (1) enclosing a drum (2) to contain the clothes to be dried by means of drying air introduced into it, a low-pressure chamber (3) to extract drying air from the drum (2) and a filtering device (4) interposed in the low-pressure chamber (3). The filtering device (4) comprises a filtering element (5), means to detach fuzz from said filtering element (5) and a build-up enclosure (6) to collect the detached fuzz. In the casing (1) there is an opening (7) communicated with the build-up enclosure (6) and configured to receive a suction nozzle (8a) of an external suction device (8) to remove the fluff from the build-up enclosure (6) through suction without the need to remove the filtering element (5) or to access it.

Abstract: A media drying system removes a moistening liquid from a moistened medium, the moistening liquid having a moistening-liquid boiling point. A liquid-supply system provides a heating liquid. A liquid-heating system warms the heating liquid to a temperature greater than the moistening-liquid boiling point. A liquid-delivery system impinges the warmed heating liquid onto a surface of the moistened medium. Heat is thus transferred from the heating liquid to the moistening liquid, vaporizing the moistening liquid and removing it from the moistened medium.

Abstract: A media drying system removes a moistening liquid from a moistened medium. A heating member rotatable around an axis has a liquid-blocking layer with an inner surface and an outer surface. A backing layer affixed to the liquid-blocking layer defines a liquid cavity not including the axis. A heating liquid heated above a moistening-liquid boiling point is sealed between the liquid-blocking layer and the backing layer and in contact with the inner surface. A media-transport system transports the moistened medium so it contacts or is entrained around the liquid-blocking member. The moistened medium contacts the outer surface of the liquid-blocking layer, heat is transferred through the liquid-blocking layer from the warmed heating liquid to the moistening liquid, and the moistening liquid is vaporized and removed from the moistened medium.

Abstract: A media drying system removes a moistening liquid from a moistened medium having first and second surfaces. A liquid reservoir contains a heating liquid heated above a moistening-liquid boiling point. A rotatable liquid-blocking member has a liquid-blocking layer with an inner surface and an outer surface. A media-transport system transports the medium entrained around the liquid-blocking member so that the first surface of the moistened medium is brought into contact with the outer surface of the liquid-blocking layer. An entrained portion of the moistened medium passes through the liquid reservoir and is submerged in the warmed heating liquid. The heating liquid contacts the inner surface of the liquid-blocking layer so that heat is transferred through the liquid-blocking layer from the warmed heating liquid to the moistening liquid, or heat is transferred from the warmed heating liquid to the second surface of the moistened medium.

Abstract: A drying device has a travel path (2) along which a web (W) of paper travels, a plurality of drying ovens (10) arranged side by side along the travel path (2), a plurality of conveyor rolls (23) provided in each of the drying ovens (10) to convey the web (W) along the travel path (2), a plurality of roll units (28a to 28c) each constituted by one or more of the conveyor rolls (23) and separated from each other along the travel path (2), and a plurality of conveyor motors (29) connected to the respective roll units (28a to 28c) to rotate the conveyor rolls (23), wherein a downstream one of the roll units with respect to the travel path is rotated at a lower rotating speed than an upstream one of the roll units.

Abstract: A media drying system removes a moistening liquid from a moistened medium. A liquid-supply system provides a heating liquid heated above a moistening-liquid boiling point. A rotatable liquid-blocking member has an inner surface and an outer surface. A media-transport system transports the moistened medium along a transport path in which the moistened medium is brought into contact with the outer surface of the liquid-blocking member in a contact zone. A liquid-delivery system impinges the warmed heating liquid onto the inner surface of the liquid-blocking member so that heat is transferred through the liquid-blocking member from the heating liquid to the moistening liquid, vaporizing the moistening liquid and removing it from the moistened medium.

Abstract: A garment drying device is provided. The garment drying device has a flexible outer layer, with a flexible inner layer attached. The outer layer may be substantially planar and may have an inner surface and an outer surface. The inner layer may be substantially planar and formed of an absorbent and flexible material. The device may further have a closure structure capable of holding the device in a rolled position when closed, and allowing the device to be in an unrolled position when open.

Abstract: A domestic appliance includes an open air duct and a flow cross-section adjuster in the air duct for adjusting a flow cross-section of the air duct. The flow cross-section adjuster includes rotatably mounted blades for noise dampening purpose. The air duct and the flow cross-section adjuster are in a cooling air inflow region relative to a heat exchanger or a compressor of the domestic appliance.

Abstract: A drying apparatus provided with a total care function with respect to a substance such as bedding, a washing machine having the same, and a control method thereof may include a sterilization course, a deodorization course, a pest elimination course, a dust elimination course, and a refreshing course, and may be capable of performing each total care function in an independent manner. By changing a rotation speed of the drum according to the type and the weight of the bedding, the damage of the substance at each of the total care courses is reduced while obtaining optimal effects. By providing a standard course having all the total care functions, the manipulation efficiency is enhanced for a user who is not familiar with the manipulation of the courses and also for a user who is not in favor of the individual manipulation of the courses.

Abstract: The present invention relates to a laundry machine that can prevent as well as remove wrinkles of laundry. A laundry machine includes a drum rotatable in a cabinet; a hot air heater to supply hot air to the drum by heating air; a steam generator to supply steam to the drum; a sensor to sense a laundry amount inside the drum; and a controller to control an amount of steam supplied to the drum based on sensing results of the sensor. In another aspect of the present invention, a controlling method of a laundry machine includes sensing a laundry amount inside a drum and drying the laundry by supplying hot air to the drum. In the drying of the laundry by supplying hot air to the drum, an amount of hot air is adjusted based on the laundry amount sensed in the sensing of the laundry amount inside the drum.

Abstract: The drying oven of the present invention comprises a holey plastic plate that can make planetary rotation. The drying mechanisms may consist of classical resistance heaters, blowing heaters and/or coolers, and ultraviolet, infrared and microwave radiation sources in horizontal, vertical or intermediate angle arrangements. There is an absorbent material in a reservoir so as to absorb the excess energy transmitted by the system. The present system completes the drying procedure quickly with full automatization within a standard period without deteriorating the sample and reveals a product which is ready to further processing.

Abstract: Provided is a dryer for drying hair or the like while evenly spraying a liquid such as a medical agent without causing the same to drip off. The dryer includes: a main body having an air outlet; and an atomizer. The atomizer includes: a container detachably attached to the main body; and an ultrasonic vibration unit close to the air outlet and atomizing the liquid in the container through an ultrasonic vibrator. Disposed around a downstream side of an outlet hole is an absorber with a passage communicated with the outlet hole that is on a downstream side of the ultrasonic vibrator in a casing composing the ultrasonic vibration unit. Formed on an inner wall of the outlet hole are thin grooves extended from the ultrasonic vibrator toward the absorber. Thus, droplets on the inner wall pass through the thin grooves before being absorbed by the absorber via capillary action.

Abstract: The invention concerns a method and a device for crushing/grinding and drying a material or a material mixture (M), in which a cyclone device (10) is used that comprises an outlet (52) for gaseous medium (G) and an outlet (14) for material (M) crushed/ground and dried in the cyclone device (10). At least a part of the gaseous medium (G) that leaves the cyclone device (10) is recirculated in such a manner that it re-enters into the cyclone device.

Abstract: An apparatus for drying and classification of a material, the apparatus including a drier (1) having a rotatable drying drum (2) that is substantially horizontal or slightly inclined relative to the horizontal direction for drying a moist material being fed through a first end (3) of the drier, and a screen device (4) provided at a second end (5) of the drier to receive dried material passed through the drying drum for classification of the material. The screen device (4) is a multilayer screen including nested screen drums (6, 7, 8, 17) attached to the drying drum (2) to rotate with the drying drum about a common rotating axis (x-x).

Abstract: A radial rotary dryer improves drying efficiency for sludge and other substances, prevents clogging phenomenon, and is realized in a simple structure. The radial rotary dryer includes spaces formed by inner and outer drums and partitioned by a plurality of radial plates. The substances, which have been introduced through a drum inlet together with hot blowing air, sequentially move throughout all spaces and are dried during drum rotation. The substances are discharged through an opposite side of the inner drum. A lift plate is attached at one surface of each radial plate to improve the drying efficiency. Hammers are attached to an opposite surface of the radial plate to free-fall according to the rotation of the drum, thereby crushing the substances. The radial rotary dryer is useful to dry sewage sludge, food waste, or other industrial substances with the best drying efficiency, the minimum installation space, and a crushing function.

Abstract: A dryer comprising a housing in which there is a hollow space which is accessible from outside through a housing port and which serves to accommodate extremities, more particularly hands, to be dried by means of a current of air, and in which a device for generating the current of air is present. The dryer also includes a means for reducing germs in the current of air, such as a plasma or ion source, or a radiation source such as UV emitter or dielectric barrier discharge lamp.

Abstract: The present invention involves to the industrial automated producing method for dewatering the sludge into the dry sludge powder and the assembly thereof. The present method is to realize the industrial automated production in the industrial automated producing assembly, especially in the main equipment, dehydrator, for dewatering the sludge into the dry sludge powder, so as to dewater the sludge having the moisture content below 85% into the dry powder having the moisture content below 5%. The method and assembly of the present invention realizes recycling, reducing, stabilizing, and reusing the sludge, and can be widely applied for dewatering process of the domestic, industrial or riverway sludge or sediment.

Abstract: A hygienic razor blade dryer is provided that comprises a housing having an interior, a razor blade holder disposed within the interior that is adapted to receive a razor blade, a dryer for drying a razor blade received in the razor blade holder, and a vacuum for evacuating the air within the interior to prevent moisture buildup in the air and on the razor blade and to inhibit oxidation on the blade surfaces. A sanitizer may also be provided to sanitize the razor blade before, during or after the dryer operation.

Abstract: A covered sample plate with wells holding samples to be dried. The cover has through holes that communicate with only a portion of each well. The covered plate is inserted into a cradle of an assembly of cradles that is rotated. The cradle assembly fits into a tub and when rotated the cradles present a sold wall that functions as a centrifugal fan that drives air out through an opening in the tub. The air is dried of solvent and re-circulated back through the through holes in the cover to the sample wells.

Abstract: The present invention provides a compact device (that may be installed onto a mobile or stationary platform) for conversion of waste to sources of energy or fertilizer. The device includes multiple stages for efficient conversation and processing of waste into energy or fertilizer, including a first stage for reducing a size of received waste, a second stage for compressing the reduced sized waste into partially dehydrated waste, a third stage for grinding and further compression of received waste from second stage to pulverize the constituent parts into highly dense substantially dehydrated pellets or fertilizers, with a fourth stage for further drying of the received pellets or fertilizers and a final fifth stage for cooling the received pellets or fertilizers into highly dense pellets. The device of the present invention further includes a controller for controlling each operational stage.

Abstract: Provided is a gas supply apparatus having a source gas supply system configured to supply a source gas to a processing container using a carrier gas, wherein the source gas is generated from a liquid raw material consisting of an organic metal material. The gas supply apparatus includes a raw material storage tank configured to store the liquid raw material therein; a gas supply portion installed to the raw material storage tank and connected to a carrier gas passage, wherein the carrier gas passage allows the carrier gas to flow; a gas outflow portion installed to the raw material storage tank and connected to a source gas passage, wherein the source gas passage allows the source gas to flow; and a baffle plate configured to prevent the carrier gas injected from the gas supply portion from being brought into direct contact with a liquid surface of the raw material.

Abstract: A rack of the type for circulating air interiorly for drying multiple pairs of boots and/or gloves, where the articles to be dried are sprayed with a liquid sterilizing agent while on the rack. The blower housing, manifold and hollow members of the rack have no exterior horizontal surfaces to prevent pooling of the sterilizing agent. In addition, drain holes are provided in the blower housing, rack tubes and manifold to prevent interior trapping of sterilizing agent or moisture from condensation. In one version intended for sterilizing with power connected, a conduit in the manifold drains any liquid in the blower housing directly into the rack tubes. Another lower cost version is intended for sterilizing after electrical power has been externally disconnected and has liquid/moisture drain holes in the blower housing. Either version may be wall mounted or arranged as portable free standing single or double sided rack drying systems.

Abstract: A system for drying a surface of a substrate is provided. The system for drying a surface of a substrate comprising: a rotary support; a first dispenser fluidly coupled to a source of liquid, the first dispenser positioned above the surface of the substrate so as to be capable of applying a film of the liquid to the surface of the substrate; a second dispenser fluidly coupled to a source of drying fluid with a supply line, the second dispenser positioned above the surface of the substrate so as to be capable of applying the drying fluid to the surface of the substrate; and a proportional valve operably coupled to the supply line between the second dispenser and the source of drying fluid, the proportional valve capable of being incrementally adjusted from a closed position to an open position.

Abstract: The invention relates to a method and to an accompanying facility (1) for drying plant material (19), such as, for example, fruits, spices, plants, herbs and the like, by means of a stream of drying gas which is supplied to a drying installation. The method according to the invention is distinguished by the fact that the material to be dried is distributed to a plurality of trays (15-17) of the drying installation (1), which trays are arranged one above the other and through which gas can flow, where each tray is supplied with a portion (10, 11) of refreshed and conditioned drying gas so that an almost uniform drying rate of the material to be dried is obtained on the individual trays.

Abstract: This invention discloses systems and methods for conversion of high moisture waste materials to dry or low moisture products for recycle or reuse. The equipment systems comprise a gas turbine generator unit (preferred heat source), a dryer vessel and a processing unit, wherein the connection between the gas turbine and the dryer vessel directs substantially all the gas turbine exhaust into the dryer vessel and substantially precludes the introduction of air into the dryer vessel and wherein the processing unit forms the dried material from the dryer vessel into granules, pellets or other desired form for the final product. Optionally, the systems and methods further provide for processing ventilation air from manufacturing facilities to reduce emissions therefrom.

Abstract: A household appliance includes a container for receiving objects to be treated, an ozone generator having an intake air conduit, and an ozone eliminating device arranged in an exhaust air conduit. The exhaust air conduit is connected to the container and includes a fan for removing exhaust air from the container. The exhaust air conduit is connected to the intake air conduit of the ozone generator.

Abstract: The invention refers to a cover, comprising a fleece arranged between a top and a bottom layer which holds a super absorber. At least in one layer a permeability area which is permeable to moisture is provided through which the cover can be moistened in a controlled way.