129results about "Leather stretching/tensioning" patented technology

A method, a system and a pelt board for the drying of the leather side of pelts from furred animals, in which the pelt board is a hollow distension element, the surface of which has an open structure. The leather side is dried by changing the air within the distension element. The distension element is lockable in a position in which it has a first circumference, and can also assume a position or be force controlled to a position in which it has a circumference which is smaller than the first, which results in a considerably easier removal of the pelt from the pelt board. A quicker, more uniform and more effective drying of the pelts is achieved, so that “black spots” on the leather side are avoided, and the pelt is fixed in its stretched position on the pelt board without the use of clips / staples.

With the use of modern distension elements / pelt boards (6) consisting of two half-parts with surfaces (14) with open structure (18) in connection with the drying of pelts (26), where the pelt is secured in the stretched position during the drying procedure by means of a holding bag (28) which, in an area at the tail end of the pelt, presses the pelt against a special holding area (8) on the surface of the distension element / pelt board, there can appear areas of the pelt where this has not been sufficiently dried, and where the pelt therefore turns mouldy / decays. Moreover, as a consequence of the pelt slipping on the surface of the board, it can be difficult to obtain a straight measuring line for the measurement of the length of the pelt. In order to relieve these problems, there is disclosed a sleeve / pelt bag item of fat and moisture absorbing material which is characteristic in that the pelt bag (10) consists of a tubular bag item to be drawn over the outside of the distension element / pelt board from the pointed end of the board for the covering of at least a part of the holding area on the distension element, the extent of said pelt bag corresponding at least to 1 / 3 but preferably1 / 2 of the extent of the holding area (8) on the distension element (6).

The present invention relates to a method and an apparatus for stretching a pelt on a pelt board, by determining a length of the pelt and adjusting the stretch force in accordance with the determined length. In particular, the length may be determined prior to stretching of the pelt, or the length may be determined after the primary stretching of the pelt stretching the pelt, where after the stretching force is reduced before securing the pelt to the pelt board.

The invention discloses a device for repairing holes in a surface of a leather made sofa. The device comprises a repairer box body. A working cavity opened downward is formed in the lower end surfaceof the repairer box body, two repair mechanisms are symmetrically arranged left and right in the working chamber, each repair mechanism comprises a supporting plate capable of moving left and right, an input shaft is rotatably arranged on the front end surface of the supporting plate, six rotating rods are uniformly and fixedly arranged on the input shaft, and repair wheels, the lower ends of which penetrate the lower end wall of the working chamber, are arranged on the lower sides of the rotating rods. For the characteristics of a leather product, leather is softened and stretched by way of extrusion to the center by the two wheels, so that the sizes of holes in the surface of the leather made sofa are reduced, the leather is softened under the circumstance of damaging the physical property of the leather to a less extent, so that the leather is fully repaired subsequently. The distance between the two wheels can be adjusted according to the sizes of the holes in the surface of the leather made sofa, so that the best repair effect is achieved.

The present invention concerns a method for fixing a fur on a pelting board (6) which is temporarily held in a pelting board holder (2), where the fur is put on the pelting board (6), where end parts of the fur are retained in a fur holder (3), and where the fur is stretched on the pelting board (6) to a desired length, where preferably the end part of the fur is fixed on the pelting board (6) by winding with a winding material (13), such as a band and further concerns an apparatus (1) for securing a fur on a pelting board (6) according to the method claim 1, where the apparatus (1) includes a pelting board holder (2), a fur holder (3) and a band winding unit (4), and where the band winding unit (4) is arranged for moving around the pelting board holder (2).

In connection with the non-destructive stretching and fastening of pelts (2) on distention elements / pelt boards (4), where the pelt is stretched and fastened in the stretched position during the drying process by means of a fixing bag, it has shown that the pelts give way (shrink) on each side of the tail root of the pelt, with the result that use is made of a number of staples for the fastening of these places on the stretched pelt. Since it is not at all desirable to use staples, a development of the distension elements / pelt boards (4) has taken place, so that these have an arched extent around two transverse axes in relation to their longitudinal axes. Moreover, it has long been desirable to be able to stretch the pelts to a greater degree, which has not been possible with the use of the known stretching machines. This development has led to the development of a method and a stretching machine for the execution of the method, where the gripping elements are configured to correspond with the shape of the distension element / pelt board, and where the pelt is engaged by the gripping elements along the whole of the lower periphery of the pelt, so that the counter-hold force in the pelt is distributed over the whole periphery of the pelt, whereby the pelt can be stretched to a greater degree without any damage to the pelt in the areas of engagement for the gripping elements.

A pelt board is disclosed for stretching and drying of tubular pelts, the pelt board having a tip end (13) from which the pelt is drawn onto the pelt board and a foot end (11), the pelt board comprising two broad elongated side surfaces (14, 15), wherein the pelt board comprises expansion means (3, 6) defining a narrow elongated side surface extending between side edges (4, 5, 7, 8) of the two broad elongated side surfaces (14, 15), and activation means (9) for selectively moving the expansion means (3, 6) to an expanded position and locking the expansion means (3, 6) in the expanded position, or unlocking the expansion means (3, 6) so that the expansion means (3, 6) are movable to a non-expanded position in which the outer cross-sectional circumference of the pelt board is reduced as compared to the expanded position.

A method for the Continuous gradual stretching and drying of industrial hides and similar products comprises at least one step (a) involving the initial partial drying of the completely wetted hides supplied following a treatment with liquids, such as tanning, retanning or dyeing, until their relative moisture content is reduced to between 45% and 65%, at least one step (b) involving the final stretching of the hides by means of localised mechanical stresses able to recover the shrinkage resulting from the partial drying thereof, characterized in that, after said initial partial drying step (a), at least one intermediate stretching step (c) is performed, followed by intermediate partial drying (d) followed by at least one intermediate stretching step (e) before proceeding to said step (c) involving the final drying and heat-fixing of the hides.