Abstract: A process used to cut and model sheets of leather or other modellable materials, according to which cutting and modeling are carried out by means of a die and a lid-punch that cooperate to cut a leather sheet positioned and tightened between the die and the lid-punch according to predefined cutting lines and at the same time model the sheet in a stable way by a plastic film injected on one of the two sides of the sheet.
Abstract: An extended nip press machine, similar to those used in the paper industry, for use in the leather industry to remove water from hides after the tanning process. The leather press consists of a shoe whose surface substantially matches the radius of an opposing pressure roll. Moving across the shoe is an endless belt, which is lubricated by a thin film of oil. Between the belt and corresponding pressure roll pass two endless felt belts, which are the means of conveying the leather hides. The nip formed by the shoe press is dramatically longer than a conventional press nip, thereby increasing the dewatering efficiency of the leather press.
Abstract: A modular oscillating head, particularly for stretching and softening industrial hides and similar products, comprising flexible mats (31, 32) for the continuous longitudinal advancement of the hides between at least one pair of plates with facing tools upon which actuation means act for producing their relative oscillation along a working plane (n) substantially perpendicular to that of the advancement. Two moving plates (7, 8) are provided anchored to respective beating bodies (3, 4) positioned on opposite sides with respect to a fixed supporting structure (2) along the working plane (.pi.). The beating bodies (3, 4) are provided with a symmetrical oscillating movement with respect to the central structure in the working plane (.pi.).
Abstract: A plate press for embossing or glazing, particularly for hides and the like, comprising a frame that supports a lower plate and an upper plate. An embossing plate for dressing the side of a hide is associable with one of the plates. The plate press comprises a film that is self-adapting, temperature-resistant, and can be interposed between the embossing plate and the hide to prevent the adhesion of the hide to the embossing plate.
September 8, 1995
Date of Patent:
September 30, 1997
VIPA S.r.l. Studio Progettazione Rappresentanze Conciarie
Abstract: A fur strip 6 is wound on each of warp yarns 2 and weft yarns 3 of a net 4 to have a hair side 6a of the fur strip 6 disposed outside the net 4 so as to form a hairy textile fabric element 7, the net 4 being woven by interlacing the warp yarns 2 with the weft yarns 3 and having end portions of the yarns 2, 3 trimmed with an edge member 5 to form a part fabric base 1. The hairy textile fabric element 7 is treated with water by spraying water thereon or by immersion in water. The part fabric base 1 is temporarily fixed to a predetermined template to permit the fur strips 6 to be dried and hardened. In the method, adjacent ones of the fur strips 6 wound on the warp yarns 2 or on the weft yarns 3 are opposed in winding direction to each other.
Abstract: A process for increasing the surface area yield of a tanned hide while improving the surface characteristics of leather resulting from the hide, the invention includes the method steps of freezing the tanned hide or splits from the hide followed by mechanical compression of the hide or splits, such as by biaxial rolling or the like, to substantially increase the yield from a given hide. A hide may be frozen in a planar configuration before splitting, the present process contemplating splitting of the frozen hide prior to mechanical compression to increase useable yield. Alternatively, the hide can be conventionally split followed by optional shaving of the splits with the splits then being frozen and subsequently subjected to mechanical compression according to the invention. The present process also includes apparatus for practice of the process and methodology relating to preconditioning of a hide and to the drying of the compressed splits.
Abstract: Skins, hides and similar flexible objects are sammied during travel through two successive nips the first of which is defined by an upper pressure roll and a first lower pressure roll and the second of which is defined by the upper pressure roll and a second lower pressure roll. A first endless belt of felt or other absorbent material is trained over the upper pressure roll and a second endless belt of felt or other absorbent material is trained over the second lower pressure roll. A liquid-permeable object-supplying endless belt conveyor has an upper reach which advances through the two nips and has a portion which overlies the second endless belt downstream of the second nip.
Abstract: A process for bending cuts of leather or other synthetic materials by means of a suction action exerted over the cuts, which were previously gummed, providing an additional action of pressure over the cuts manually or by a pneumatic press installed over the cover of the working bench.
Abstract: A drying press for hides, comprising two endless drying felts (1; 4) passed over rolls (2, 3; 5, 6), said felts being pressed against each other at press rolls (2, 5) to form a drying press gap for hides which are passed therethrough, as well as hide stretching means upstream of said gap. A problem to be solved is to provide such hide stretching means that can be used to effectively prevent the folding of the trailing edges of hides to be fed through a drying press. To solve this problem, there are an upper stretcher (8) and a lower stretcher (7) between which a hide (18) is passed while being lifted off a drying felt (1). Stretchers (7 and 8) press a hide therebetween with a suitable sliding fitness, said hide keeping taut and off a felt.
Abstract: A frame forms a container having four vertical sides and a flat bottom plate. A hydraulically raised and lowered gate forms one of the sides. Wet hides are stacked on a pallet commonly used with a forklift. The gate is raised, and the loaded pallet placed on the bottom plate. The gate is lowered, and fillers are extended through side openings in the pallet into voids between the pallet top and bottom. A platen above the hides is hydraulically pressed downward within the container to compress the hides. A selected pressure on the hides is maintained for a desired compression period. The fillers within the voids limit deflections of the pallet top during compression of the hides, and consequently prevent damage to the pallet. The fillers are withdrawn, the gate raised, and the loaded pallet removed. The compressed, dry, cohesive hide bundles have a flat top and flat, vertical sides and are more efficiently packed for shipping.
Abstract: An apparatus for bending cuts of leather or other synthetic materials by means of a suction action exerted over the cuts, which were previously gummed, providing an additional action of pressure over the cuts manually or by a pneumatic press installed over the cover of the working bench.
Abstract: A leather press in which two wedges are synchronously driven to raise a lower platen in the press from an open condition to a position adjacent an upper platen of the press. The lower platen is movably mounted on a support. The support and the wedges are in slidable engagement with one another to effect a preliminary closing of the press. A plurality of pressurizable members such as hydraulic pancake cylinders may be mounted between the movable platen and the support so that the platens are secondarily urged together by the application of hydraulic pressure, to apply the required working pressure, to a leather workpiece disposed between the platens. The hydraulic pancake cylinders are arranged to be disposed over a broad area of the lower platen to efficiently provide maximum pressure thereacross.
Abstract: Apparatus for the continuous thermal treatment of flexible sheet material includes a heated cylinder which is rotatably mounted in a frame. The presser cylinder is arranged in parallel spaced relation to the heated cylinder so as to permit passage of sheet material therebetween. The lever member is pivotably carried by the frame and a beam member which extends generally parallel to the presser cylinder is pivotably mounted on the lever member. A drive cylinder is rotatably carried by the frame on the side of the presser cylinder which is remote from the heated cylinder, the drive cylinder extending parallel to the presser cylinder. The presser cylinder is freely supported on the drive cylinder and is rotatable thereby. Elements are carried by the lever member and by the beam member which are cooperable for regulation of the spacing between the presser and heated cylinders.
March 29, 1979
Date of Patent:
December 16, 1980
Vyzkumny ustav kozedelny
Zdenek Miculka, Vladislav Janirek, Vladimir Rektorik, Karel Bajak
Abstract: The invention relates to a sammier press, especially for leather and fur, with a pressure roll and counter-pressure rolls bearing thereon, whereof at least one is driven, and with two conveyor belts moved by frictional engagement which receive the material that is to be pressed between them, drawing it through the pressing zone formed between the pressure roll and the counterpressure rolls.
December 22, 1978
Date of Patent:
June 24, 1980
Louis Schweizer GmbH & Co. KG, Lederfabrik
Abstract: A leather press in which two wedges are synchronously driven to raise a lower platen in the press from an open condition to a position adjacent an upper platen of the press. The lower platen is movably mounted on a support. The support and the wedges are in slidable engagement with one another to effect a preliminary closing of the press. A pressurizable expandable member such as a flexible diaphragm may be mounted between the movable platen and the support so that the platens are secondarily urged together by the application of hydraulic pressure, to apply the required working pressure, to a leather workpiece disposed between the platens. The diaphragm is preferably provided by a wall portion of an inflatable sac.
Abstract: A press comprises two cooperating endless belts each trained over a support and tensioning roller. The end supports of the support roller for the lower belt rest on a hydraulically actuated piston which enables this support roller to be displaced towards the other support roller. Two pairs of like bracing members hold the end supports of the support rollers, the bracing members of each pair having one end pivoted to a respective hydraulic cylinder for the pistons and the end supports of the other support roller being detachably fixed to the other bracing member ends. Each pair of bracing members defines a guide for the displacement of the end supports of the support roller for the lower belt. One of the end supports of each support roller is pivotally mounted for pivoting the support rollers in a plane defined by the axes of the support rollers.
Abstract: This invention relates to apparatus for moistening and conditioning sheet materials for example leathers and similar materials. The apparatus comprises two endless moisture-absorbent conveyor belts which come together, in the operation of the apparatus, between a pair of opposed flat presser surfaces. The apparatus comprises means for moistening the conveyor belts and for heating at least one of the flat surfaces. The apparatus also comprises means for moving the flat surfaces apart to permit introduction of material carried between the conveyor belts into the region between the flat surfaces and together to press the material on the belt. By reason of this pressure an intensive heat transfer occurs from the flat surfaces to the conveyor belt whereby the water in the conveyor belt is evaporated and transferred into the leather. The apparatus further comprises drive means whereby the belts are moved to transport the leather or other sheet material only while the flat surfaces are spaced apart.