Abstract: The invention relates to a method for impregnating and drying a continuous paper web (1) by means of a urea resin dissolved in water, and to a corresponding system. Such paper webs (1) are employed for example as furniture foil or floor laminate, wherein in the known art melamine resin is used exclusively for bonding to a substrate. This is relatively expensive. Therefore the object of the invention is to create a method in which the paper web (1) which is impregnated by means of urea resin can be bonded to the substrate with a high degree of operational reliability. Said object is achieved in that the temperature of the paper web (1) is determined separately in each of the drying zones (3.1, 3.2, 3.3, 3.4), that for each of the drying zones (3.1, 3.2, 3.3, 3.4) an amount and/or a temperature of the circulating air are regulated so that the maximum temperature of the paper web (1) is 99° C., and that exhaust air is extracted from a first one of the drying zones (3.1, 3.2, 3.3, 3.

Abstract: The invention relates to a method for impregnating and drying a continuous paper web (1) by means of a urea resin dissolved in water, and to a corresponding system. Such paper webs (1) are employed for example as furniture foil or floor laminate, wherein in the known art melamine resin is used exclusively for bonding to a substrate. This is relatively expensive. Therefore the object of the invention is to create a method in which the paper web (1) which is impregnated by means of urea resin can be bonded to the substrate with a high degree of operational reliability. Said object is achieved in that the temperature of the paper web (1) is determined separately in each of the drying zones (3.1, 3.2, 3.3, 3.4), that for each of the drying zones (3.1, 3.2, 3.3, 3.4) an amount and/or a temperature of the circulating air are regulated so that the maximum temperature of the paper web (1) is 99° C., and that exhaust air is extracted from a first one of the drying zones (3.1, 3.2, 3.3, 3.

Abstract: The invention relates to a device for applying a coating material, which consists of a liquid resin and a fine-particled abrasive material, to a continuously impregnated paper web which is used in the production of abrasion-resistant laminates. Said device comprises a deflection roller whereon the paper web is arranged in the contact area, a dosing roller which is arranged in a parallel manner on the deflection roller, a narrow gap which encompasses said two rollers, and an application unit. Known application units comprise slot nozzles through which the treatment material is injected into the paper web. The problem thereof is that a complete cross-linking of the paper web is difficult to obtain and the treatment material is injected, in excess into the paper web. The aim of the invention is to overcome said problems.

Abstract: The invention relates to a device for applying a coating substance to a continuous paper web in a process for producing abrasion-resistant laminates for manufacturing decorative paper. The coating substance consists of a viscous mixture of melamine resin and alphacellulose to which particles of corundum are added, and is applied to the visible surface of the paper. The inventive device includes a deflector roll (2) on which the paper web (1) lies in an area in which it loops around; a metering roll (6) which is arranged parallel to the deflector roll (2) and forms the boundary of a gap with the same, and which is driven synchronously or almost synchronously with the deflector roll; a slit nozzle (7) for applying the coating substance either directly to the paper web (1) on the deflector roll (2) or to the metering roll (6); and a doctor blade of a rectangular piece (9) of flexible rubber type material.

Abstract: A system for treating a porous web with a liquid treatment liquid continuously moves the web along a path sequentially through a saturating station, steaming station, and drying station. A drum in the saturating station engages a back face of the web and a trough closely surrounds the drum and confronts a front face of the web. Seals form between the drum and trough a generally closed and pressurizable chamber through which the web passes and which is supplied with the treatment liquid at superatmospheric pressure so as to force the liquid against only the front face of the web. In the steaming station jets of steam are directed against the back face of the web to heat the web and disperse the treatment liquid throughout the web. The web is heated and dried in the drying station.

Abstract: A paper web impregnated with a liquid resin and following impregnation is coated with an abrasive particle containing coating mass or composition and then dried before a liquid resin is applied which does not contain the abrasive particles. The web is then finally dried and the resulting paper is particularly suitable as a cover sheet in the hot pressing of laminates since it minimizes wear of the laminate press.

Abstract: A device for impregnation of webs of porous materials with a liquid impregnating medium under increased pressure comprises a roller rotatable about a horizontal axis, a trough arranged so that the roller is partially inserted in the trough to form a chamber between an inner surface of the trough and an outer surface of the roller, a unit for supplying an impregnating medium into the chamber, and a unit forming an inlet slot for introducing a web to be impregnated into the chamber and an outlet slot for withdrawing the impregnated web from the chamber. The chamber over a path from the inlet slot to the outlet slot narrows and again increases many times.

Abstract: A suspension dryer for freshly moisturized webs of swellable paper has a row of lower nozzle beams which extend transversely to a throughgoing direction so as to be spaced from one another along a dryer length with a distance from one another and provided at an upper side with blowing openings, a row of upper nozzle beams extending transversely to the throughgoing direction at a distance from one another along the dryer length so as to be offset relative to the lower nozzle beams and provided on a lower side with blowing openings, a width of the nozzle beams arranged in an initial portion of the dryer length is greater than a width of the nozzle beams arranged in the remaining portion of the dryer length, and a distance between two adjacent ones of the nozzle beams arranged in the initial portion is greater than a distance between two adjacent ones of the nozzle beams arranged in the remaining portion.

Abstract: In known pressure impregnating devices there is a chamber, which continuously narrows in the transport direction, between a cylinder around which the web to be impregnated loops, and the inner wall of a trough containing the impregnating agent. The impregnating agent is supplied to the chamber under high pressure, which is further increased in the chamber by dynamic effects. Sealing problems arise at the inlet and outlet slits as well as at the front faces because of the high pressure. Disruptions in the operation can be created by fluff coming loose from the paper web as well as by impregnating agent penetrating between the sliding faces. The new device is intended to remedy these disadvantages, and is provided with the seals have alternating narrow gaps and wide grooves in the form of a labyrinth seal. The grooves are have drain openings for the impregnating agent flowing through.

Abstract: During thermal treatment of continuously moving metal bands more heat is supplied over a part of a treatment path to edge regions of the band per surface unit than to the center region of the band. This prevents formation of a wavy shape in the edge regions of the metal band which is advantageous for a further treatment.

Abstract: The invention relates to an apparatus for the heat treatment and/or the drying of a web of material 1 passing continuously through. In this case the web of material 1 is treated on one or both sides with infrared radiation. The infrared radiators 6, 7 can be adjusted in their radiation capacity over the width of the web of material 1 by being heated by a plurality of individual hot-gas streams which are guided parallel to the web of material 1, can be adjusted to differing temperatures or can sweep at differing flow rates over the rear sides of radiating plates 6a, 7a of the infrared radiators 6, 7.