Abstract: The problems caused by chemical and thermal shrinkage of hard roll covers, are reduced by the inclusion of one or more intermediate compressive layers between the metal roll substrate and the outer cover, or cover. A compressive layer has the properties of being rigid enough to allow the cover to be applied to the roll, and compressible enough to deform and absorb the stresses which occur as the cover is shrinking during processing.In one embodiment, the intermediate compressive layer comprises a three dimensional fabric that is filled preferably with a thermoset resin system which cures at lower temperature than cover. In a second embodiment, the precise amount of shrinkage in the roll is predetermined to a high enough degree of accuracy so that a depth for the fabric layer can be used to compensate for the amount of shrinkage, thereby eliminating the need for filling. In a third embodiment, the compressive layer is comprised of a meltable material wherein said material melts at cure temperatures.

Abstract: The invention relates to a premanufactured covering which mainly consists of a thermoplastic material and which covering is intended for roads, parking areas, etc. The covering has reflective material, friction material or the like on the intended upward surface. The covering according to the invention is characterized in that the material includes a visible temperature indicator when being applied.

Abstract: This invention relates to a blank, which when formed into a gable-top container with an extensible pouring spout, eliminates "duckbilling" and allows the gable-top container to form more easily. Such structures of this type, generally, eliminate "duckbilling" or the folding out of the pouring spout through the use of reverse or inverted score lines located in the top of the gable-top container.

Abstract: Compositions and methods for manufacturing composite laminate structures incorporating sheets having a moldable matrix are disclosed. Suitable compositions are prepared by mixing together a water dispersable organic binder, water, and appropriate additives (such as aggregates and fibers) which impart predetermined properties so that a sheet formed therefrom has the desired performance criteria. The compositions are formed into sheets by first extruding them into a sheet and then calendaring the sheet using a set of rollers. The calendered sheets are dried in an accelerated manner to form a substantially hardened sheet. The drying process is performed by heated rollers and/or a drying chamber. The inorganically filled sheets so formed may have properties substantially similar to sheets made from presently used materials like paper, cardboard, polystyrene, or plastic. Such sheets can be rolled, pressed, scored, perforated, folded, and glued before or after being incorporated into composite laminate structures.

Abstract: A method of manufacturing a plastic shell by providing a printed applique having a central portion with a peripheral skirt portion having an edge, then inserting the applique into the recess on a first side of a mold. The skirt of the applique has a length greater than the depth of the recess, so that the edge of the skirt extends beyond the parting line. The second side of the mold is closed to enclose the recess, and has a second recess that receives the edge of the skirt on the second side of the parting line. Plastic material is injected into the closed mold pressing the applique against the first side, and providing a bezel with an applique that covers the exterior of the front portion, and which extends to cover the skirts beyond the parting line.

Abstract: A moisture absorbent material comprises a porous matrix of absorbent alumina, the volume of the pores of the matrix being between 60 and 90%, preferably 80 to 85% of the volume of the material. The average diameter of the pores is between 5.times.10.sup.-9 and 1.times.10.sup.-6 m. The pores contain a crystalline deliquescent compound, preferably calcium chloride, in an amount of between 4 and 20%, preferably between 8 and 12%, by weight, excluding any water of crystallization, with respect to the total weight of the material. The absorbent may be incorporated in a shoe insole and absorbs up to 1.5 ml moisture per gram of dry material whilst generating heat, thereby maintaining the feet of the user both warm and dry.

Abstract: A base board for a layered corrugated fiberboard structure comprises a corrugated fiberboard material including a corrugating medium having flutes, first folds along which the corrugated fiberboard material is folded in the shape of the inverted letter V, and second folds along which the corrugated fiberboard material is folded in the shape of the letter V, and the first folds and the second folds are formed in the corrugated fiberboard material in parallel to each other and in an alternate arrangement so as to extend perpendicularly or at an angle other than a right angle to the flutes. The second folds are lines of perforations, and portions of the corrugated fiberboard material that forms an outer surface when folded are incised along the lines of perforations.

Abstract: A film blank for packages, especially for folding boxes, has impressed fold lines (BL) in the form of groove-like depressions (5), which extend from a film upper face (3) and at the base of the depressions (5) are closed off from the other film face (4). The base of the depressions (5) has zones (8) of greater depth T.sub.2 and zones (9) of lesser depth T.sub.1 alternating along its length. For ease of manufacture with close tolerances, smooth running and improved insensitivity to cracking the zones (9) of lesser depth T.sub.1, are bounded by circular arcs 10 of radius R at least 1.1 mm the center of curvature (M) of which lies on the other side a line (L) which connects the zones (8) of greater depth T.sub.2 together. Preferably, the zones (9) of lesser depth T.sub.1 merge with the zones (8) of greater depth T.sub.2 at an acute angle ".alpha." from 0.degree. to 60.degree., and the points (P') where the zones (8) of greater depth T.sub.2 and zones (9) of lesser depth T.sub.1 meet are rounded concavely.

Abstract: Improved method of applying guide markings to a writing surface such as posterboard. The guide markings are visually perceptible at a writing distance away from the posterboard, and substantially imperceptible at a viewing distance away from the--writing surface.

Abstract: A formed piece comprises a substantially cylindrical outer surface layer of sheet material extending along a longitudinal axis of the formed piece from a first end to a second end of the formed piece, and inner layers of sheet material within the outer surface layer randomly arranged and creating air gaps between at least a portion of the inner layers. The surface layer and inner layers of sheet material are twisted around the longitudinal axis of the formed piece and along the length of the longitudinal axis.

Abstract: A small particle toner image is formed on a primary image member (21), such as a photoconductor; electrostatically transferred to an intermediate transfer member (42); and then electrostatically transferred to a receiving sheet. The intermediate transfer member (42) includes a substrate, a compliant blanket (19), and a thin, hard overcoat (80) sectioned into small, discreet segments (81).

Abstract: The present invention provides a heat transfer printing sheet comprising a substrate sheet, and a thermally-expandable ink layer formed thereon, comprising as an expanding agent a thermally-expandable micro-capsule containing therein an easily-volatilizable hydrocarbon, and a binder resin having a number-average molecular weight of 1,000 to 30,000.The present invention also provides a heat transfer printing sheet comprising a substrate sheet, a release-property-controlling layer and a thermally-expandable ink layer comprising an expanding agent and a binder, in the mentioned order.

Abstract: Compositions and methods for manufacturing sheets having a highly inorganically filled matrix. Suitable inorganically filled mixtures are prepared by mixing together an organic polymer binder, water, one or more inorganic aggregate materials, fibers, and optional admixtures in the correct proportions in order to form a sheet which has the desired performance criteria. The inorganically filled mixtures are formed into sheets by first extruding the mixtures and the passing the extruded materials between a set of rollers. The rolled sheets are dried in an accelerated manner to form a substantially hardened sheet, such as by heated rollers and/or a drying chamber. The inorganically filled sheets may have properties substantially similar to sheets presently made from traditional materials like paper, paperboard, polystyrene, plastic, or metal. Such sheets can be rolled, pressed, scored, perforated, folded, and glued.

Abstract: The present invention relates to a polymer panel with a sealing membrane for making electrical and mechanical connections through the panel. The invention further relates to a method of processing such panel.

Abstract: A water based crackle finish for surfaces includes a base coating having a low molecular weight polymer dissolved in an aqueous solution. Disposed on the dried base coating is a coating having an aqueous emulsion of a high molecular weight polymer which is dried. If desired, a stain coating, a sealer coating and a glaze coating and combinations thereof may be disposed on the surface under the base coating. Also, if desired, a fly-speck coating and a top coating may be applied over the crackle coating. A method of applying the coating is disclosed.

Abstract: The problems caused by chemical and thermal shrinkage of hard roll covers, are reduced by the inclusion of one or more intermediate compressive layers between the metal roll and the outer cover, or "topstock". A compressive layer has the properties of being rigid enough to allow the cover to be applied to the roll, and compressible enough to buffer and absorb the stresses which occur as the cover is shrinking during processing.In one embodiment, the intermediate compressive layer comprises a three dimensional fabric that is filled preferably with a thermoset resin system which cures at lower temperature than cover. In a second embodiment, the precise amount of shrinkage in the roll can be predetermined to a high enough degree of accuracy so that a depth for the fabric layer can be used to compensate for the amount of shrinkage, thereby eliminating the need for filling. In a third embodiment, the compressive layer is comprised of a wax material.

Abstract: Improved posterboard is formed from a rectangular posterboard having vertical side edges and horizontal top and bottom edges. Guide marking are applied to the posterbboard. The guide markings are visually perceptible at a writing distance away from the posterboard, and substantially imperceptible at a viewing distance length away from the posterboard.

Abstract: Packing material and method in which a sheet of paper stock is folded in opposite directions along alternate parallel lines to form a series of ridges and valleys, cuts are made in the stock at intervals spaced along the ridges, and sections of the stock adjacent to the cuts are folded in a reverse direction along the fold lines at the ridges to form downwardly extending pleats beneath the ridges. The material can be crumpled for use as a dunnage material or wrapped about an item to be protected. In one disclosed embodiment, the material can be compressed for shipping and storage and expanded for use. In another, which is particularly suitable for use as a protective wrap, the folded stock is affixed to a backing sheet.

Abstract: The invention concerns a package padding and an apparatus for forming same. The package padding is continuous and web-like and formed of superimposed paper courses (1,2,3). On the substantial surface area of one paper course (2) has with a pair of shaping rolls (16,17) been embossed a cellular padding structure. The package padding comprises a punch joint region (5) formed with the aid of a pair of punch joint rolls (18,19), and an intact area (7) substantially free of punchings, the package padding being more bulky and fluffy in the region thereof than in the punch joint region (5). In the embossed paper course (2) have by means of the speed differential of the punching rolls (18,19) and the shaping rolls (16,17) been folded pleats (8) so that the package padding contains per unit length of the package padding a greater length of paper material of the second paper course (2) than of paper material of the first paper course (1).

Abstract: A molding obtained by laminating resinous plates of 0.05 to 1 mm thick, prepared by impregnating 20% by volume or more of a reinforcing fiber with a thermoplastic resin, and molding the resultant laminate, wherein sections where deviation or deformation is caused by an external force, or preferably nonjoining parts having an area of 5 to 60% based on the area of the location where impact is absorbed, are provided between the laminated layers constituting the molding, or the laminated layer surface where the impact is absorbed is formed with a shape having a curvature of 5 to 20 mm in radius. The molding absorbs impact force significantly and prevents efficiently human body, etc. from the shock upon striking.

Abstract: A gas permeability control film having a barrier property against water, bacteria, and viruses, an oxygen gas permeation amount controlled to fall within the range of 10.sup.3 to 10.sup.7 cc/m.sup.2 .multidot.24 hours.multidot.25.degree. C., and a controlled carbon dioxide gas permeation amount. The gas permeability control film has an organic film in which non-through pores having an average opening width falling within the range of 0.5 .mu.m to 150 .mu.m are formed at a density of 500 to 200,000 pores/cm.sup.2.

Abstract: Decorative pleats have two cuts made in each of two or more pleats and the fold of the pleat is reversed between the cuts. When used as a decorative display for a photograph, picture, merchandise or other item, the cuts may be made angularly to hold the item in place. Cuts may be perpendicular to the fold of the pleat, angular to the fold, zigzag, curvilinear or of other shape. The pleats may be a blind, a lantern or of other shape.

Abstract: A sculpture is provided having cuts extending from an exterior surface to an internal position. The cuts are then smoothed using a solvent and simultaneously dyed with an appropriate pigment. The resulting internal faces exhibit both reflectivity and translucency depending on the illumination and viewing angles.

Abstract: A method of simulating a creeper for mechanics servicing a vehicle spaced from a floor and for catching vehicle drippings provides a sheet of cellular material with a lower surface for contacting the floor therealong and with a parallel upper surface. That method and simulated creepers provide for a catching of vehicle drippings and avoid a need for creeper casters by coating the upper surface of that sheet with a dripping-impervious layer facing the vehicle having a lower surface friction than the cellular sheet at its lower surface so that a mechanic may slide along the surface of that layer while the lower surface remains stationary on the floor.

Abstract: The matter of concern is the reflection of a radio wave such as a television broadcast wave from a laminated panel having a substrate low in reflectance for radio waves and a layer relatively high in reflectance for radio waves. The reflection is greatly reduced by dividing the reflective layer into a plurality of discontinuous segments by a series of relatively narrow slits such that the width of each segment in the direction parallel to the direction of the electric field of the radio wave is not greater than 1/3 of the wavelength of the radio wave. The invention is suitable for application to a heat reflecting glass with a heat reflecting film having a surface resistivity below about 500 .OMEGA./.quadrature., and in that case it is preferable that the width of each segment of the heat reflecting film is not greater than 1/20 of the wavelength.

Abstract: A fiberboard, preferably made by consolidating a water-felted mat without added binder and being suitable for pressure-molding into a hardboard door facing having a high degree of fidelity to the contours of the die set, is incised on both the major face and the obverse face with incisions having a depth of from about 10% to about one third the thickness of the board. The incisions are aligned on lines that are preferably arranged at right angles across the face of the board. The lines are preferably spaced a maximum of about 0.5 inches apart, and the incisions on each line are discontinuous, preferably separated by a maximum of about 0.5 inches.

Abstract: Construction and method of making a decorative cracked glass laminate in tile, panel, sheet, plate, veneer or in situ form. It comprises three layers laminated together, an inner backing layer, a substantially light-transparent outer layer, and a decoratively cracked glass intermediate layer sandwiched between the inner and outer layers. The intermediate layer, preferably a mirror, is made of tempered glass and the outer layer is made of annealed glass. The laminate is made by laminating the inner and outer layers to the intermediate layer while it is in uncracked condition, and then causing it to crack in situ as by cutting into an exposed edge. Alternatively, the two glass layers may be laminated together and then laid in a backing material such as plastics which then forms the backing layer of the two-glass laminate.

Abstract: Ceramic materials to be insert-cast are disclosed, which each contain not less than 65% by volume of aluminum titanate as a crystalline phase, and have an average particle diameter of crystals thereof being not less than 10 .mu.m, Young's modulus of 50 to 2,000 kgf/mm.sup.2, compression strength of 5 to 40 kgf/mm.sup.2, and porosity of 5 to 35%. Ceramic port liners are also disclosed, which are free from cracking due to compression force during insert-casting, peeling-off during use, and facilitate insert-casting. To attain this, a reinforcement which meets either one or both of requirements that differences in coefficient of thermal expansion at 800.degree. C. and Young's modulus between the reinforcement and a material constituting the port liner body are in a range of .+-.0.1% and in a range of .+-.1,000 kgf/mm.sup.2, respectively, is filled into a depressed portion at an outer peripheral surface of the port liner body to form an integrated structure with a flat or swelled surface.

Abstract: A multilayered reflective polymeric body of alternating layers of polymers wherein at least a portion of the layers are in a folded-over relationship is provided along with a coextrusion apparatus and method of preparing the multilayer polymeric body. The reflective polymeric body includes at least first and second diverse polymeric materials having a sufficient number of alternating layers of the first and second polymeric materials such that a portion of the light incident on the body is reflected. The first and second polymeric materials differ from each other in refractive index by at least about 0.03. The reflective body is thermoformable and may be fabricated into wall panels, dishware, decorative trims, and the like, and may also find use in security applications such as credit cards, credit card emblems, or on currency.

Abstract: A product press formed from a paperboard and a method for forming the same is provided, wherein the product includes a press formed three-dimensional curvilinear region having a desired shape and containing a formation improvement structure for facilitating the press formation and maintenance of the desired product shape and for preventing the machine directionality of the paperboard from distorting the product from its desired shape. The press formed paperboard product of the preferred embodiment comprises a planar wall having a periphery which is at least partially curvilinear and a peripheral wall angularly oriented with respect to the planar wall. The peripheral wall extends along at least a portion of the curvilinear periphery of the planar wall and the closest portion of the peripheral wall is spaced a substantial radial distance from the periphery of the planar wall.

Abstract: A vinyl floor covering to accommodate wood subfloor contraction and expansion as well as rolling load incorporates a foamed plastisol encapsulated glass mat which may be cut to form pivot points and expanded under a controlled pre-stressed condition. The glass mat serves as a carrier during manufacture and an "elastic glass" reinforcing layer during use as either tension or loose-lay flooring. The floor covering may be a true hybrid surface covering which is capable of accommodating the dimensional change of a target subfloor by utilizing the characteristics of both tension floorings and loose-lay floorings.

Abstract: A cushioning device includes a plurality of liquid cells encapsulated in a flexible substrate sheet wherein each liquid cell is filled with water therein and the cells are juxtapositionally disposed on the sheet so that a cellular sheet may serve as a cushioning device for a user's seating, leaning or wearing for comfortable cushioning purposes.

Abstract: An improved insulating glass assembly incorporates an articulated low relief structured glass sheet as one or both external faces of the assembly. The low relief structured glass sheet is composed of a formation of external convex curvatures and a corresponding array of internal concavities, defined and separated by a plurality of imparted graphic lines and a corresponding plurality of internal retaining ridges. Unique optical effects are intrinsic to the structured glass sheet. The disclosure includes the mold apparatus for manufacturing low relief structured glass sheets.

Abstract: A vinyl tension floor covering includes a reinforcing layer, preferably disposed below the neutral bending plane. The floor covering elongates in at least one direction due to a controlled pre-stressed condition and tends to return to its original pre-elongated dimension. Reinforcing layers expand in the across machine direction as well as machine direction in response to a tensile stretching force in the machine direction or roll-up growth.

Abstract: A vinyl floor covering to accommodate wood subfloor contraction and expansion as well as rolling load incorporates a foamed plastisol encapsulated glass mat which may be cut to form pivot points and expanded under a controlled pre-stressed condition. The glass mat serves as a carrier during maufacture and an "elastic glass" reinforcing layer during use as either tension or loose-lay flooring. The floor covering may be a true hybrid surface covering which is capable of accommodating the dimensional change of a target subfloor by utilizing the characteristics of both tension floorings and loose-lay floorings.

Abstract: A breathable metallized polyolefin film is prepared by: melt embossing a highly filled polyolefin film to impose a pattern of different film thickness therein; stretching the melt embossed film to impart greater permeability in the area of reduced thickness in comparison to the areas of greater thickness; and coating the resulting stretched embossed film with a suitable metal.

Abstract: A scribed paperboard sheet and a method for its manufacture is characterized by scribing a plurality of parallel guidelines in a finished paperboard web while the web is being tensioned. Adjustable scribing knife assemblies are provided for simultaneously scribing both surfaces of the web, following which the web of scribed paperboard is cut into individual sheets. The depth of penetration and the lateral spacing of the scribing knives are controlled to define a particular scribed layout of lines in the surfaces of the paperboard sheets. Alternatively, a grid of guidelines may be scribed into the web by an embossed roller arranged adjacent a tension roller to define a nip through which the paperboard web passes.

Abstract: As articles of manufacture, iridescent plastics are provided. The plastics include at least one surface having a layer of material adhered thereto, the layer of material having a plurality of fractures formed therein whereby light is reflected from the fractures to impart an iridescent quality to the surface. A process for forming iridescent plastics or for imparting an iridescent quality to a plastic member is also provided.

Abstract: The present invention relates to a new fabric which is rich in a new, raw material feeling which has been unparalleled before, a fashionable feeling and an unexpected feeling and to its method of preparation. The fabric of the present invention is a three dimensional fabric having a unique structure characterized by a structure wherein a mass of a number of apexes of piled fibers is made in a body to form a scaly structure and a number of said scaly structures cover the surface layer of the fabric.

Abstract: A method and apparatus for making a pliable wallcovering. The wallcovering replicates the appearance of aged, cracked plaster wall finishes, can be readily hung over existing walls, and is durable. In the method of making the wallcovering a putty-like joint compound mixture is applied to a pliable stretchable woven sheet. The sheet is comprised of strands forming interstitial openings extending through the sheet. The joint compound mixture is forced through the interstitial openings and is allowed to dry. The dried joint compound mixture is cracked in a manner which renders the wallcovering pliable.

Abstract: Film-backed pressure-sensitive adhesive tape that resembles conventional creped paper-backed masking tape but can be torn cleanly with the fingers, is prepared by extruding an isotactic polypropylene film, passing it through the nip between a rubber roll and a water-cooled embossed steel roll at a temperature and rate such that predominantly crystalline film is obtained. The embossed roll imparts a ridge-and-valley configuration to one surface of the film, valleys extending crosswise of the tape and having a depth greater than half the total film thickness. When the smooth face of the film is coated with pressure-sensitive adhesive, the resultant tape can be torn readily, using only the fingers, in a straight line crosswise of the tape. When subjected to a stretching force in the machine direction (at right angles to the ridges and valleys), the tape elongates uniformly without "necking down." A specific embodiment of this invention is a sterilization indicator tape made with the above described film.

Abstract: An apparatus and technique for strengthening and reinforcing book bindings. A laminate having a polyester face sheet is coated on one side with adhesive. A backing sheet is releasably secured to the adhesive. The backing sheet is split down the center thereof to define a removable center strip with adjacent side strips on each side thereof. These three strips facilitate the method of application of the laminate to reinforce and secure a book binding.

Abstract: Disclosed is a method for producing an original for use in an overhead projector through an electrophotographic process. The method comprises a process for applying a first light-transmissive toner onto a surface of a transparent film, a process for heat-fixing the first light-transmissive toner on the film so that particles of the first light-transmissive toner are not melted completely and such that a diffusive surface is formed, a process for applying a second light-transmissive toner onto the diffusive surface corresponding to a document image, and a process for heat-fixing the toner image on the diffusive surface so that particles of the second light-transmissive toner forming the toner image are melted completely and that a toner image having a smooth surface is formed.

Abstract: A copper foil sheet is pasted onto the surface of a semiconductor module case to shield it from static electricity and noise. The sheet is provided with cross-cut lines corresponding to the positions of protruding parts on the surface of the case such that the sheet can be pasted along the contours of these protruding parts to improve its shielding effects.

Abstract: A carpeting material of nonwoven synthetic thermoplastic resin fibers, capable of being folded so as to fit onto sharply irregular surfaces such as car trunk liners, made by the process of needle-looming a nonwoven carpeting material having higher and lower melting temperature synthetic thermoplastic resin fibers, subjecting the material to sufficient heat to soften and subsequently harden and rigidify one side of the carpeting, and then punching two substantially parallel rows of regularly spaced slots in the back side of the carpeting material. The slots of one row are arranged so that they are staggered in relation to the slots of the parallel row. The arrangement of slots in the back side of the carpeting enables it to be sharply folded while maintaining tear resistance.

Abstract: A grid system for stabilizing an underlayer and providing a support surface ncludes 60 longitudinally extending polyethylene strips which are bonded one to another in an offset manner and are adapted for providing a grid. The grid has a first collapsed orientation wherein the strips are generally linearly aligned and substantially contiguous and a second expanded orientation wherein the strips are generally longitudinally sinusoidal for providing a plurality of cells. The cells are filled with compacted naturally occurring beach sand. An asphalt layer is applied to the upper surface of the grid and penetrates the cells to a predetermined depth for thereby providing a roadway surface adapted for vehicler traffic.

Abstract: A breathable polyolefin film is prepared by melt embossing a highly filled polyolefin film to impose a pattern of different film thickness therein and by stretching the melt embossed film to impart greater permeability in the areas of reduced thickness in comparison to the areas of greater thickness.

Abstract: A process for the production of synthetic coverings for floors, walls, etc. which exhibit a cracked effect is presented. The process includes the step of depositing on a compatible substrate, a plastisol coating composition containing a gel previously prepared from a mixture of two materials, the mixture being comprised of (1) a solid sorbent agent and (2) a solvent which causes swelling by absorption of the solvent in and on the sorbent agent; or alternately, by an aqueous dispersion of a (1) dry mixture of PVC and of (2) a plasticizer containing at least one resin forming a gel in water. Subsequent to depositing this plastisol coating on the substrate, a thermal treatment for the formation of a film or for drying is carried out at a sufficient temperature whereby an irreversible process of preliminary gelling of the coating and shrinkage of the gel by desorption of the solvent from the sorbent agent or by evaporation of the water, respectively, simultaneously occurs.

Abstract: A textile substrate is intended to serve as a support for bio-transformations and phase separations.The manufacturing method consists in: making filaments from fibers; forming a substructure in the form of a continuous cloth; forming a fleece of fibers on one side of said cloth. The cloth is manufactured in such a way as to develop within it a transverse heterogeneity of a kind to confer on said cloth a tendency to roll up on itself, the structural configuration of the support is determined by an operation to cut a plurality of slits repeated in the direction in which the cloth is manufactured.

Abstract: A floor covering such as a nap mat or carpet of washable type comprises a rubber or plastic back, wherein the nap or tufts is/are fastened in the back material. The floor covering has means for increasing the drain of liquid from the nap when the floor covering is subjected to the influence of a force, such as a pressing force, a centrifugal force, and/or a pressure difference between the front and rear side of the floor covering. This means may be a normally closed perforation of the back material and/or an intermediate tissue via which the nap is secured to the back material. Preferably the intermediate tissue is a non-woven material, mainly consisting of synthetic fibres having a weight of 100-300, preferably 250 g per m.sup.2, a fibre thickness of 5-30, preferably 8 decitex, and a tissue thickness of 1-5, preferably 2 mm. Thereby a nap mat or carpet is achieved having a short drying time and/or provides a small drying energy consumption after washing.