EP3135776A1 - Procédé d'étirement d'une peau sur une planche à peau - Google Patents

Procédé d'étirement d'une peau sur une planche à peau Download PDF

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Publication number
EP3135776A1
EP3135776A1 EP15182654.2A EP15182654A EP3135776A1 EP 3135776 A1 EP3135776 A1 EP 3135776A1 EP 15182654 A EP15182654 A EP 15182654A EP 3135776 A1 EP3135776 A1 EP 3135776A1
Authority
EP
European Patent Office
Prior art keywords
pelt
stretching
force
board
length
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP15182654.2A
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German (de)
English (en)
Inventor
designation of the inventor has not yet been filed The
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Minkpapir AS
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Minkpapir AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Minkpapir AS filed Critical Minkpapir AS
Priority to EP15182654.2A priority Critical patent/EP3135776A1/fr
Priority to EP16711610.2A priority patent/EP3274479B1/fr
Priority to EP19191276.5A priority patent/EP3620540A3/fr
Priority to CN201680030170.1A priority patent/CN107667181B/zh
Priority to EP19172143.0A priority patent/EP3553188A3/fr
Priority to LT16711610T priority patent/LT3274479T/lt
Priority to DK16711610T priority patent/DK3274479T3/da
Priority to PL16711610T priority patent/PL3274479T3/pl
Priority to US15/561,223 priority patent/US10745768B2/en
Priority to PCT/EP2016/056215 priority patent/WO2016150938A1/fr
Publication of EP3135776A1 publication Critical patent/EP3135776A1/fr
Priority to DKBA202000015U priority patent/DK202000015Y3/da
Priority to US16/934,908 priority patent/US11505839B2/en
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C14—SKINS; HIDES; PELTS; LEATHER
    • C14B—MECHANICAL TREATMENT OR PROCESSING OF SKINS, HIDES OR LEATHER IN GENERAL; PELT-SHEARING MACHINES; INTESTINE-SPLITTING MACHINES
    • C14B15/00—Mechanical treatment of furs
    • C14B15/04—Fur dressing
    • C14B15/06—Fur-stretching devices

Definitions

  • animal pelts are often stretched in a non-destructive way in order to maximize the size of the pelt.
  • the pelts define a substantially tubular shape and have an outwardly oriented fur side and an inwardly oriented leather side. The stretching is taking place after skinning the animal and scraping off the layer of fat on the leather side of the pelt and before the drying of the pelt.
  • the word pelt is understood to encompass pelts of minks, foxes and similar small mammals.
  • the pelts are often stretched on a pelt board, which is nowadays made of plastic.
  • the leather side of the pelt is facing the surface of the pelt board and the pelt board may in addition be provided with a fat absorbing material such as a paper bag or sleeve, which is in contact with the leather side of the pelt.
  • a fat absorbing material such as a paper bag or sleeve
  • WO 2006/026986 A1 discloses a help arrangement for clamping the nose end of a pelt to a pelt board.
  • WO 2007/033681 A2 discloses a method and machine for the folding out of the tail part of the pelt in connection with the stretching of the pelt on the pelt board.
  • WO 2008/025364 A1 relates to a method and machine for performing water brushing of taned pelts in order to achieve a more presentable appearance of the pelt.
  • WO 02/44428 A1 relates to another method and machine for stretching of a pelt on a pelt board.
  • the pelt is secured in the stretched position by means of a sleeve or bag which is drawn over and around the pelt board, so that the pelt is pressed and locked against the pelt board.
  • This method which is also described above, is nowadays used as a standard method for fixing the pelt in the stretched position in a non-damaging way.
  • DK 169 525 B1 discloses a machine for stretching a pelt.
  • the machine includes a gripping mechanism for holding the pelt.
  • Magnetic sensors are used for controlling the extent of stretching of the pelt by the gripping mechanism.
  • DK 2000 01174 L discloses another method in which the stretched pelt is held in place in a non-destructive way by the use of a pelt bag or sleeve.
  • EP 2 818 563 A1 discloses a hair controller for mounting on a stretching machine.
  • the controller utilizes a nozzle or orifice for providing a stream of air.
  • US 2003/0019255 A1 discloses yet another method for fastening a pelt on a pelt board after stretching by the use of a sleeve or bag, and a corresponding sleeve for use with the method.
  • WO 2008/022644 A1 discloses a tube-shaped holding bag, which is drawn over the fur side of the pelt for holding the pelt in a stretched position.
  • WO 2012/126467 discloses a technique of determining the maximum force to which a pelt may be exposed by measuring the initial lengths of the pelt prior to applying a stretch force to the pelt and predicting the maximum allowable force to be applied to the pelt from the initial length.
  • WO 2015/024788 discloses an apparatus and a method for stretching a pelt according to which method and in which apparatus the speed with which the pelt is stretched is gradually reduced during the stretching of the pelt.
  • the pelt will thus not be stretched in an optimal way by applying the stretching force to the lower part of the pelt. It is thus an object according to the present invention to provide technologies for properly stretching of both the upper part of the pelt as well as the lower part of the pelt.
  • the stretching operation requires the user to hold one hand on the pelt while the other hand is operating the user interface of the stretching apparatus.
  • This is disadvantageous in relation to the alignment of the pelt in the stretching apparatus and it would be advantageous if the user could be able to use two hands holding the pelt instead of only one hand.
  • it is an object according to the present invention to provide technologies for allowing the user to operate the stretching apparatus while keeping both hands on the pelt.
  • the wrapping operation performed by using a single stretchable wrapping foil is suffering from serious drawbacks, in particular in relation to the speed of the operation and the physical impact on the pelt board and the fixation of the pelt board by stretching the wrapping foil during the wrapping operation.
  • a stretching apparatus for stretching a pelt on a pelt board, the pelt having a substantially tubular shape defining an inwardly oriented leather side, an outwardly oriented fur side, a nose end, a rear end and a pair of front leg cavities, the pelt board defining a top end for accommodating and fixating the nose end of the pelt, a circumferential wall for facing the inwardly oriented leather side of the pelt and a base end located opposite the top end, the stretching apparatus comprising:
  • the front leg cavities appear in the pelt after skinning and cutting off the paws of the animal.
  • the front leg cavities may comprise smaller tubular pelt parts which originally covered the front legs of the animal and which are normally inverted and folded inwardly to be positioned between the leather side of the pelt and the pelt board in order for these parts to be dried out as well.
  • cavities On the outside of the pelt when mounted on the pelt board, cavities thus appear which have been designated front leg cavities.
  • the holding device is holding the base end of the pelt board in a fixated position and preferably in a vertical orientation such that the pelt board extends upwardly from the holding device and consequently, the pelt extends on the pelt board from a rear end adjacent the holding device to a nose end pointing upwardly and away from the holding device.
  • the pair of stretching members of the stretching device may be inserted into a respective front leg cavity and thus at least partially enter the leg portion of the pelt which as explained above has been inverted.
  • the pelt By moving the stretching member towards the holding device, typically downwardly, the pelt will be stretched since the stretching members will cause the leg cavities to move along with the stretching members, thereby inducing a stretching force onto the upper part of the pelt, i.e. the part of the pelt being closest to the nose end.
  • the pelt may be stretched in a non-destructive way without needing to fasten any part of the pelt and allowing air to still access all parts of the leather side of the pelt.
  • Typical forces involved are about 100-150N for achieving a proper non-destructive stretching of the upper part of the pelt.
  • the stretching members comprise cylindrical pins. Such cylindrical pins will be advantageous for entering the leg cavities and applying the stretching force in a non-destructive way.
  • the apparatus comprises a first fastening device for fastening the rear end of the pelt, the first fastening device being movable in a direction towards the holding device for stretching the pelt.
  • the lower end of the pelt is stretched simultaneously with the upper part of the pelt.
  • the stretching of the lower part of the pelt may be performed according to the prior art or as will be described further below.
  • the rear end, of the pelt is fastened to a fastening device which is then moved in a direction towards the holding device, i.e. generally downwardly.
  • the fastening device should fasten the pelt along its complete contour and not only the tail and rear legs, since otherwise the non fastened parts of the contour of the lower end will not be stretched and may on the contrary be contracted, yielding a lower price for the pelt.
  • the apparatus comprises a second fastening device for fastening a tail part extending from the rear end of the pelt, the second fastening device being movable in a direction towards the holding device for stretching the pelt. It may in addition to the above be advantageous to stretch the tail part since the tail forms part of a very dense connective tissue which extends from the tail part along the back side of the pelt to the nose part, which tissue may be capable of withstanding a larger stretching force.
  • the apparatus comprises a third fastening device for fastening and fixating the nose end of the pelt, the third fastening device being movable in a direction towards the holding device for stretching the pelt.
  • the nose end may be fixated and moved in a direction away from the holding device, i.e. typically upwardly. Since the stretching force is applied to the pelt board, the rigidness of the pelt board sets a final limit on the amount of stretching which may be applied to the pelt, since a too large stretching force will cause the pelt board to bend and any additional stretching will not stretch the pelt but further bend the pelt board. To avoid this and relieve the stress on the pelt board, the nose end may be moved in the opposite direction of the stretching force, thereby relieving the pelt board and allowing a higher total stretching force.
  • the stretching device, the first fastening device and/or the second fastening device and/or the third fastening device is/are movable by means of a pneumatic drive, a hydraulic drive or a spindle drive.
  • the above drive mechanisms may be used for an efficient and accurate stretching to be performed.
  • the first fastening device and/or the second fastening device comprise opposing gripping members for gripping the pelt between the inwardly oriented leather side and the outwardly oriented fur side.
  • the pelt is preferably gripped between opposing gripping members.
  • the holding device, the stretching device, the first fastening device, the second fastening device and/or the third fastening device comprise one or more vibration actuators for inducing one or more oscillations onto the pelt.
  • the fibres in the pelt tissue may additionally loosen in a non-destructive way allowing the pelt to be stretched further than by just applying the stretching force in a single direction.
  • the vibration actuator will be operating at a frequency of between 1 Hz and 100 Hz. Such frequencies will be advantageous for obtaining the above effect.
  • the stretching device, the first fastening device, the second fastening device and/or the third fastening device comprise a compressed air outlet for temporarily removing any fur hair located adjacent the compressed air outlet.
  • the stretching apparatus further comprises a holding bag applicator.
  • the holding bag may be applied automatically onto the pelt board after the stretching has been completed by the use of a holding bag applicator.
  • the base end of the pelt board comprises a connecting element and the holding device comprises a locking part for locking the connecting element to the holding device.
  • the pair of stretching members is interconnected by a rack and pinion actuator.
  • the stretching members may be adapted to different widths between the front leg cavities for different pelts.
  • a stretching apparatus for stretching a pelt on a pelt board, the pelt having a substantially tubular shape defining an inwardly oriented leather side, an outwardly oriented fur side, a nose end, a rear end and a pair of front leg cavities, the pelt board defining a top end for accommodating and fixating the nose end of the pelt, a circumferential wall for facing the inwardly oriented leather side of the pelt and a base end located opposite the top end, the pelt further defining a contour constituting a leg side contour and a back side contour, the stretching apparatus comprising:
  • the above aspect is preferably used for achieving a complete stretching of both the upper part and the lower part of the pelt.
  • the above method is preferably used together with the above apparatuses.
  • a stretching apparatus for stretching a pelt on a pelt board, the pelt having a substantially tubular shape defining an inwardly oriented leather side, an outwardly oriented fur side, a nose end and a rear end, the pelt board defining a top end for accommodating and fixating the nose end of the pelt, a circumferential wall for facing the inwardly oriented leather side of the of the pelt and a base end located opposite the top end, the pelt further defining a contour constituting a leg side contour and a back side contour, the stretching apparatus comprising:
  • the pelt and the pelt board have been described in detail above.
  • the pelt has a substantially tubular shape having four leg parts on a leg side and a back side opposite the leg side.
  • the pelt defines a rear end which is understood to be the part of the pelt where the tail part and the rear leg parts are located.
  • the contour of the pelt is in the present context understood to constitute the circumference of the pelt, which is divided into a leg side contour and a back side contour, each constituting approximately a half part of the full contour.
  • the holding device is holding the base end of the pelt board in a fixated position and preferably in a vertical orientation such that the pelt board extends upwardly from the holding device and consequently, the pelt extends on the pelt board from a rear end adjacent the holding device to a nose end pointing upwardly and away from the holding device.
  • the holding device thus defines a pelt board space in the stretching apparatus which should be unobstructed for allowing the pelt board to be fitted correctly.
  • the first gripping mechanism fixates the rear end of the pelt along any one of the leg side contour or the back side contour, preferably the back side contour. Thereby it is preferable that the complete half part of the contour is fixated by the first gripping mechanism for achieving a uniform stretching of the pelt.
  • the first gripping mechanism is preferably located spaced apart from the user.
  • the first and the second gripping mechanisms are movable synchronously in a longitudinal direction by means of a driving mechanism located behind the first gripping mechanism in order to adjust the position of the gripping mechanisms and for performing the stretching.
  • the second gripping mechanism is movable between a first position constituting a mounting position which is used for simplifying the placement of the pelt board in the holding device and simplifying the accessing of the pelt board's space, and a second position which is a stretching position which is used when the apparatus is stretching the pelt.
  • the first position the second gripping mechanism is located behind the pelt board space and preferably beside the first gripping mechanism allowing the user to freely access the pelt board space for placing the pelt board in the correct position.
  • the second gripping mechanism is located on the opposite side of the pelt board space such that the pelt board when mounted in the holding device is located between the first gripping mechanism and the second gripping mechanism.
  • the second gripping mechanism When the first gripping mechanism has been fastened to the rear end of the pelt, the second gripping mechanism is moved from the first position to the second position and thereafter the second gripping mechanism is fastened to the rear end of the pelt along the contour which is not already fixated by the first gripping mechanism, preferably being the leg side contour. Thereafter the stretching of the pelt is initiated.
  • the first gripping mechanism is fastening the rear end of the pelt along the back side contour and the second gripping mechanism is fastening the rear end of the pelt along the leg side contour.
  • the pelt board leg side is facing the user during the fixation.
  • the first gripping mechanism and/or the second gripping mechanism comprise a gripping element and an opposite holding element, the gripping element being movable in relation to the holding element in order to pin the rear end of the pelt between the gripping element and the holding element.
  • the pelt is pinned between the gripping element and the holding element which are movable to pin the pelt between the fur side and the leather side.
  • the second gripping mechanism comprises a first half part and a second half part, each half part being adapted for gripping approximately a quarter of the contour. Each half part may be moved separately between the first position and the second position.
  • the first half part and a second half part when in the first position, are located on opposite sides of the pelt board space.
  • the first half part and the second half part are located on opposite sides of the first gripping mechanism when in the first position.
  • the movement between the first position and the second position involves a linear movement and a rotational movement of the second gripping mechanism.
  • the second mechanism when moved from the first position to the second position is first pulled forward and then rotated to face the pelt board in the pelt board space in the second position. After mounting and stretching, the procedure is reversed before the pelt board is removed.
  • the holding device and/or the fastening device comprise a vibration actuator for inducing an oscillation onto the pelt.
  • the fibres in the pelt tissue may additionally loosen in a non-destructive way allowing the pelt to be stretched further than by just applying the stretching force in a single direction.
  • the vibration actuator operates at a frequency of between 1 Hz and 100 Hz. Such frequencies will be advantageous for obtaining the above effect.
  • the stretching apparatus further comprises a holding bag applicator.
  • the holding bag may be applied automatically onto the pelt board after the stretching has been completed by the use of a holding bag applicator.
  • the base end of the pelt board comprises a connecting element and the holding device comprises a locking part for locking the connecting element to the holding device.
  • the fastening device comprises a compressed air outlet for temporarily removing any fur hair located adjacent the compressed air outlet.
  • the holding device and/or the fastening device is/are movable by means of a pneumatic drive, a hydraulic drive or a spindle drive.
  • the above drive mechanisms may be used for an efficient and accurate stretching to be performed.
  • the fastening device comprises a laser for generating a visual alignment line on the pelt.
  • the positioning of the pelt will be simplified as the user will be aided in the alignment of the pelt.
  • the correct positioning is critical for achieving a correct stretching of the pelt and avoid any misalignment of the pelt caused by bad positioning of the pelt in the fastening mechanism.
  • a stretching apparatus for stretching a pelt on a pelt board, the pelt having a substantially tubular shape defining an inwardly oriented leather side, an outwardly oriented fur side, a nose end, a rear end and a pair of front leg cavities, the pelt board defining a top end for accommodating and fixating the nose end of the pelt, a circumferential wall for facing the inwardly oriented leather side of the of the pelt and a base end located opposite the top end, the pelt further defining a contour constituting a leg side contour and a back side contour, the stretching apparatus comprising:
  • the above aspect is preferably used for achieving a complete stretching of both the upper part and the lower part of the pelt.
  • At least the above object or at least one of numerous further objects which will be evident from the below description of the present invention, is according to one aspect of the present invention obtained by a method of stretching a pelt on a pelt board, the pelt having a substantially tubular shape defining an inwardly oriented leather side, an outwardly oriented fur side, a nose end and a rear end, the pelt board defining a top end for accommodating and fixating the nose end of the pelt, a circumferential wall for facing the inwardly oriented leather side of the of the pelt and a base end located opposite the top end, the pelt further defining a contour constituting a leg side contour and a back side contour, the method comprising the steps of:
  • the above method is preferably used with the above apparatuses.
  • a stretching apparatus for stretching a pelt on a pelt board, the pelt having a substantially tubular shape defining an inwardly oriented leather side, an outwardly oriented fur side, a nose end and a rear end, the pelt board defining a top end for accommodating and fixating the nose end of the pelt, a circumferential wall for facing the inwardly oriented leather side of the pelt and a base end located opposite the top end, the stretching apparatus comprising:
  • the holding device is holding the base end of the pelt board in a fixated position and preferably in a vertical orientation such that the pelt board extends upwardly from the holding device and consequently the pelt extends on the pelt board from a rear end adjacent the holding device to a nose end pointing upwardly and away from the holding device.
  • the gripping mechanism fixates the rear end of the pelt along its contour between the fur side of the pelt and the leather side of the pelt. It is thereby important that the complete tubular contour of the pelt is fixated as the pelt otherwise may be skewed during stretching.
  • the gripping mechanism thus comprises two distinct states, namely a fixated state where the gripping mechanism is fixating the rear end of the pelt, and a non-fixated state where the pelt is loose relative to the gripping mechanism.
  • the gripping mechanism In order for the pelt to be put into the correct position, the gripping mechanism is initially in the loose state allowing the user to insert the rear end of the pelt between gripping members of the gripping mechanism.
  • the user may fine tune the position by hand and by moving the complete fastening device including the gripping device towards or away from the holding device by using the drive mechanism, the user may position the rear end of the pelt in the correct longitudinal position.
  • the gripping mechanism is controlled by a first user interface and the drive mechanism is controlled by a second user interface, which both should be positioned such that the user may operate both the user interfaces while still keeping both hands on the pelt for ensuring that the correct alignment of the rear end of the pelt is kept while the user is changing the position of the fastening device by using the same hands. This may be achieved by locating both the user interfaces a distance of less than 30cm from the gripping mechanism.
  • the user may hold both hands on the rear end of the pelt and simultaneously adjust the gripping mechanism to the correct position and fasten the pelt to the gripping mechanism while maintaining both hands on the pelt.
  • the first user interface and/or the second user interface is located less than 30cm from the gripping mechanism, preferably less than 20cm, more preferably less than 10cm, most preferably less than 5cm. More advantageously, the first user interface, the second user interface or both user interfaces are located even closer to the gripping mechanism, such as the distances indicated above.
  • the first user interface and/or the second user interface comprise a proximity sensor, such as a photo detector or an IR sensor.
  • a proximity sensor such as a photo detector or an IR sensor.
  • touch or contact free interfaces are used, which eliminates the need for the user to actuate a button or the like with the limited capabilities of moving the hand which the user has when already holding the rear end of the pelt and attempting to position it in the correct position relative to the gripping mechanism.
  • the first user interface and/or the second user interface comprise a pressure sensor, a resistive sensor or a capacitive sensor.
  • a touch sensor is used. In this way unintentional activation of the sensor may be avoided.
  • the second user interface comprises a first sensor for causing the drive mechanism to move the fastening device away from the holding device, and a second sensor for causing the drive mechanism to move the fastening device towards the holding device.
  • the second user interface is preferably split into two separate sensors for controlling individually the two different directions of the drive mechanism.
  • the two sensors are preferably located on opposite sides of the gripping mechanism such that each sensor may be maneuvered by a separate hand.
  • the distance between the gripping mechanism and the holding mechanism is unobstructed and/or the stretching apparatus enables a human user to simultaneously reach both the gripping mechanism and the holding mechanism by the same hand.
  • the user interfaces are positioned without any obstructions between the user interfaces and the gripping mechanism in order to improve the user's ability to reach the user interfaces while manipulating the rear end of the pelt.
  • the holding device and/or the fastening device comprises a vibration actuator for inducing an oscillation onto the pelt.
  • a vibration actuator for inducing an oscillation onto the pelt.
  • the vibration actuator operates at a frequency of between 1 Hz and 100 Hz. Such frequencies will be advantageous for obtaining the above effect.
  • the stretching apparatus further comprises a holding bag applicator.
  • the holding bag may be applied automatically onto the pelt board after the stretching has been completed by the use of a holding bag applicator.
  • the base end of the pelt board comprises a connecting element and the holding device comprises a locking part for locking the connecting element to the holding device.
  • the fastening device comprises a compressed air outlet for temporarily removing any fur hair located adjacent the compressed air outlet.
  • the holding device and/or the fastening device is movable by means of a pneumatic drive, a hydraulic drive, an electric drive or a spindle drive.
  • the above drive mechanisms may be used for an efficient and accurate stretching to be performed.
  • the fastening device comprises a laser for generating a visual alignment line on the pelt.
  • the positioning of the pelt will be simplified as the user will be aided in the alignment of the pelt.
  • the correct positioning is critical for achieving a correct stretching of the pelt and to ensure that any misalignment of the pelt caused by incorrect positioning of the pelt in the fastening mechanism is avoided.
  • the fastening device comprises opposing gripping members for gripping the pelt between the inwardly oriented leather side and the outwardly oriented fur side.
  • the gripping members initially assume the non-fixated position when the rear end of the pelt is inserted between the gripping members and the drive mechanism is used for positioning the gripping mechanism at the rear end of the pelt.
  • the fixated position is used when the rear end of the pelt is fixated between the opposing gripping element for stretching the pelt.
  • the above method may advantageously be used together with the above apparatus.
  • stretching assemblies comprising combinations of pelt boards and a stretching apparatuses as described according to any of the above aspects.
  • the experiments made by the applicant company have revealed that apart from the force applied, the force gradient, i.e. the increase in force per incremental length increase, is more important as to determining the safe maximum force to which the pelt may be exposed before tearing apart the pelt.
  • the experiments made by the applicant company have revealed that for a specific species, for instance male or female mink, the stretching may be performed until a safe force value is reached, which safe force value may be determined constituting a force to which the pelt may readily be exposed without running any substantive risk of tearing apart the pelt since the ability of the pelt due to its elastic properties allows for a larger force impact than the safe initial force or force gradient to which the pelt may be exposed.
  • the method according to the present invention is characterized in that the method of stretching a pelt on a pelt board comprises performing the steps of:
  • the method of stretching a pelt on a pelt board further comprises the additional steps of
  • the registering of the coherent data constituted by the increase of the length of the pelt and/or the total length of the pelt and the force applied or preferably the force gradient applied allows for the determination of the safe maximum force gradient and consequently the maximum force which the pelt may be exposed to, consequently, the method according to the present invention further comprises:
  • the registering of the coherent data constituting the first set and also the second set allows for a self-learning procedure to be carried out as the data registered for several pelts of a specific species allows the forecast to be improved by the recording or registering of the data and in doing so making the data reliable as to the determination of the safe force and safe force gradient and furthermore, and possibly more importantly, the maximum allowable force or maximum allowable force gradient to which the pelt may be exposed without causing deterioration or tearing apart the pelt.
  • the improved breeding techniques when raising species in particular the costly mink, minks from which mink pelts are produced, constantly increases the length of the pelt of the minks, for which reason the learning operation of registering the coherent data described above produces a more reliable and up-to-date forecast for the stretching of the pelt of the species in question.
  • the forecast may readily be accomplished simply from the daily use of the stretching apparatus rather than from extensive and extremely costly experiments.
  • the method being used for stretching a pelt of a male or female mink, the length of which is to be classified according to the international classification established by Kopenhagen Fur A/S, the method further comprising the step of comparing the lengths measured in step ix) with a specific class of said pelt and on the basis of the forecasts determining whether or not further stretching of the pelt may be performed safely for reaching a further class or no further stretching is to be applied.
  • a further increased and safe stretching may be obtained by performing the steps ix-xi in an intermittent operation, i.e. by performing the repeated stretching in steps and allowing the pelt after stretching to a specific limit to rest until further stretching is performed.
  • the velocity with which the actuator is driven may be reduced or alternatively increased.
  • FIG.1A shows a perspective view of a pelt 10.
  • the pelt 10 shown here is of a mink, however, it will be anatomically similar for other small furred mammals such as fox etc.
  • the pelt 10 has a tubular shape and comprises an inwardly oriented leather side 12, an outwardly oriented fur side 14, a nose end 16 and a rear end 18.
  • the rear end 18 defines a contour 20 along the circumference of the tubular pelt 10.
  • the contour 20 may be divided into a leg side contour onto which the rear legs 22 of the pelt is attached and a back side contour onto which a tail part 29 of the pelt 10 is attached.
  • FIG.1B shows a perspective view of the pelt 10 when mounted on a pelt board.
  • the pelt 20 is mounted on the pelt board 26 such that a top end 28 of the pelt board 26 is accommodating and fixating the nose end 16 of the pelt 10 and the inwardly oriented leather side 12 of the pelt 10 is facing a circumferential wall 30 of the pelt board 26.
  • the pelt board 26 extends in a longitudinal direction from a base end 32 to the top end 28.
  • the base end 32 may be provided with a connecting element 34.
  • the front leg parts have been inverted and are accommodated between the pelt 10 and the pelt board 26, thereby establishing a pair of front leg cavities 24' of the pelt 10 between the nose end 16 and the rear end 18.
  • the pelt board 26 may typically be provided with a fat absorbing and preferably also water absorbing paper (not shown) between the circumferential wall 30 and the inwardly oriented leather side 12.
  • FIG.1C shows a perspective view of a stretching assembly comprising a pelt board 26 and a stretching apparatus 35.
  • the pelt board 26 is provided with a pelt 10 as described above.
  • the stretching apparatus 35 comprises a stretching device 36 for stretching the upper part of the pelt defined between the nose end 16 and the front leg cavities 24'.
  • the stretching device 36 comprises a pair of cylindrical stretching members 38 which are adapted to be inserted into the front leg cavities 24'.
  • the stretching apparatus 35 additionally comprises a holding device 40 adapted for holding the base end 32 of the pelt board 26 by fixating the connecting element 34 such that the pelt board 26 extends in a longitudinal direction in the stretching apparatus 35.
  • the stretching apparatus 35 further comprises a first fastening mechanism 42 for fastening the rear end 18 of the pelt 10 along the contour 20, a second fastening mechanism 44 for fastening the tail end 29 of the pelt 10, and a third fastening mechanism 46 for fastening the nose end 16 of the pelt 10.
  • the first fastening mechanism 42 is used for stretching the lower part of the pelt 10 extending between the front leg cavities 24' and the rear end 18 of the pelt. At least the second fastening mechanism 44 and the third fastening mechanism 46 are considered to be optional in the present setup.
  • FIG.1D shows a perspective view of a stretching assembly when the pelt 10 has been mounted. All of the holding device 40, stretching device 36, first fastening mechanism 42, second fastening mechanism 44 and third fastening mechanism 46 are movable along the longitudinal direction defined by the pelt board 26 in order to adapt the stretching apparatus 35 to different pelt boards 26 and different pelts 10. This is shown by the arrows.
  • FIG.1E shows a perspective view of a stretching assembly when the stretching of the pelt 10 starts.
  • the pelt 10 is thereby stretched by causing the stretching device 36, first fastening mechanism 42 and second fastening mechanism 44 to move towards the holding device 40 by means of appropriate drive mechanisms which will be discussed further below.
  • the third fastening mechanism 46 may be caused to move in the opposite direction for relieving the pelt board 26 of pressure.
  • the forces involved for each of the stretching device 36, first fastening mechanism 42, second fastening mechanism 44 and third fastening mechanism 46 are typically in the range of 100-200N.
  • the forces may be applied at a steady magnitude, or alternatively a vibration or oscillation is induced in the pelt, or yet alternatively a combination of the above where e.g. a time period of oscillations are followed by a steady stretching force in order to first loosen the fibers of the pelt 10 and thereafter stretching the fibers of the pelt 10.
  • FIG.1F shows a perspective view of a stretching assembly and the optional provision of an adapter 48 which is used for allowing pelt boards 26 having a different sized connecting element 34' to be used in the present stretching assembly 34.
  • the adapter 48 is thereby connected to the different sized connecting element 34' whereby the adapter is provided with the proper sized connecting element 34 for use with the holding device 40 of the stretching apparatus 35.
  • FIG.2A shows a perspective view of the mechanical setup of the stretching apparatus 35.
  • the stretching apparatus 35 comprises a compressed air source 50 and a display 52.
  • the stretching device 36 is driven pneumatically and movable by use of compressed air from the compressed air source 50.
  • the holding device 40 and the first fastening device 42 are mechanically driven by spindle drives 54' and 54, respectively. It is thereby understood that various combinations of drives may be used for the stretching device 36, the holding device 40, the first fastening mechanism 42, the second fastening mechanism 44 and the third fastening mechanism 46.
  • a user interface in the form of a photo detector 55 which is located in close proximity relative to the first fastening device 42 for controlling the fixation and non-fixation positions of the first fastening device 42 while still keeping the hands of the user in contact with the pelt.
  • the photo detector 55 may be replaced by a similar proximity sensor or a detector using other touch free or touch technologies.
  • FIG.2B shows an perspective view of the stretching assembly wherein the pelt board 26 is placed in the correct position in the stretching apparatus 35.
  • FIG.3A shows a close up view of the stretching device 36.
  • the stretching members 38 are interconnected by a rack and pinion actuator 56. This allows the stretching members 38 to move relative to each other to adapt to different sized pelts 10 having different distances between their front legs.
  • FIG.3B shows a close up view of the stretching device 36.
  • the stretching members 38 have moved towards each other by means of the rack and pinion actuator 56 in order to adapt to a smaller pelt 10 i.e. having a smaller distance between the front legs.
  • FIG.4 shows a close up view of the first fastening device 42.
  • the first fastening device 42 comprises a first gripping element 58 for fastening the rear end of the pelt along the back side contour, and a second gripping element 60 for fastening the rear end of the pelt along the leg side contour.
  • the first gripping element 58 comprises a pair of first gripping elements 62 and 62' which are movable in relation to a first holding element 64 for fastening the rear end of the pelt along the back side contour between the gripping elements 62 and 62' and the holding element 64.
  • the holding element 64 may be movable in order to adapt to the pelt board.
  • the second gripping element 60 comprises a pair of second gripping elements 66 and 66' which are movable in relation to a pair of second holding element 68 and 68' for fastening the rear end of the pelt along the leg side contour between the gripping elements 66 and 66' and the holding elements 68 and 68'.
  • the above gripping or non-gripping operations are performed in a transversal direction in relation to the longitudinal direction defined by the pelt board.
  • first fastening device 42 While the gripping or non-gripping operations of the first fastening device 42 is controlled by the above-mentioned photo detector, there is further provided a pair of additional photo detectors 70 in close proximity to the first fastening device 42 which are operating as a user interface for the drive mechanism in order to move the fastening device in the longitudinal direction of the pelt board.
  • FIG.5A shows a close up view of the first fastening device 42 when in the first position, which is a mounting position of the first gripping mechanism 58.
  • the second gripping mechanism 60 is thereby folded into a non-use position.
  • One of the set of second gripping element 66 and holding element 68 is folded to one side of the first gripping mechanism 58 whereas the other set of second gripping elements 66' and holding elements 68' is folded to the opposite side of the first gripping mechanism 58.
  • the pelt board has been removed. It is, however, understood that the pelt board is present in the pelt board space in front of the first gripping mechanism 58 then the stretching apparatus is in use.
  • FIG.5B shows a close up view of the first fastening device 42 when the second gripping mechanism 60 has been folded into a use position.
  • the pelt may already have been fixated between the first gripping elements 62 and 62' and the first holding element 64, or alternatively as shown here this step is performed later.
  • the second gripping mechanism 60 including the second gripping elements 66 and 66' and the second holding elements 68 and 68' are thereby first moved in a transverse direction relative to the longitudinal direction of the pelt board and thereafter rotated in order to be located opposite the first gripping mechanism 58 and facing the pelt board space.
  • FIG.5C shows a close up view of the first fastening device 42 when the first holding element 64 and the second holding elements 68 and 68' has been moved towards the pelt board space for enclosing the pelt board.
  • FIG.5D shows a close up view of the first fastening device 42 when the first gripping elements 62 and 62' have been moved towards the first holding element 64 in order to fasten the rear end of the pelt along the back side contour and the second gripping elements 66 and 66' have been moved towards the second holding elements 68 and 68' in order to fasten the rear end of the pelt along the leg side contour.
  • Start buttons 72 and 72' may be provided on opposite sides of the first fastening device 42 in order to initiate the stretching procedure.
  • the buttons 72 and 72' must be pressed simultaneously using both hands whereby the risk of personal injury is significantly reduced.
  • FIG.6 is a diagrammatic view illustrating empirical data obtained by stretching a pelt of a mink, the mink being a male mink while recording the length of the pelt and the force applied to the pelt as the pelt is stretched by means of the stretching assembly described above with reference to FIGS.1-5 .
  • the stretching being produced by moving the holding device 40 relative to the top end 28 of the pelt board 26 and in doing so performing a total stretching of the pelt between the nose 16 of the pelt 10 and the rear leg 22 or tail end of the pelt 10.
  • the length of the pelt is recorded and along the ordinate axis, the force applied is recorded.
  • markings A, B, C, D and E are provided, which markings correspond to the illustrations of FIG.7A-7E to be described below, and the curve recorded as an incremental or stepwise recording of the correspondence between the actual length of the pelt and the force applied exhibit evidently the characteristics of a curve which initially has a low tangential gradient and at its end at the point E at which point the pelt is broken, exhibits an almost vertical tangential gradient.
  • a highly advantageous feature characteristic of the present invention has been deduced, namely the feature of simply allowing the stretching to be performed initially without paying any careful attention to the stretching operation, and in doing so stretching the pelt until a pre-set safe force value or safe force gradient value has been reached as is indicated by B.
  • B the curve illustrating the correspondence between the incremental increase of the length of the pelt and the force applied to the pelt for increasing the length of the pelt starts rising and in doing so indicates that the stretching now is becoming more critical as further stretching of the pelt may cause damage to the pelt eventually causing the pelt to be broken indicated by E.
  • the corresponding values of the length of the pelt while applied to a stretch force and the stretch force are recorded and at the same time, the gradient increase determined as the increase from a previous corresponding set of data is recorded as the force gradient is considered to be a reliable and predictable measure indicating the shift from the safe stretching of the pelt until point B and the gradual dramatic force increase for obtaining a further incremental increase of the length of the pelt. Consequently, it is contemplated that the force gradient as such is indicative of the safe continuous operation of stretching the pelt and the reaching of a gradient exceeding a specific value such as the value in point D constitutes a maximum predicted safe value for further stretching the pelt.
  • the values when stretching a male mink may constitute measures of 750, 800, 850 and 900mm, respectively, and the upper limit of L5 may typically be of the order of 950mm although the proved techniques of feeding the animals has throughout the last 10-15 years dramatically increased the maximum length of male and female minks from approximately 80cm to 100cm or even more.
  • the curve of FIG.6 Due to the increase in the overall length of the pelt of minks due to the above-described improved feeding techniques, the curve of FIG.6 have changed and will in the future be changed, however, it is contemplated that the general configuration or shape of the curve illustrated in FIG.6 is universally applicable and further according to an advantageous feature of the present invention, the data recorded while stretching a single pelt may be recorded and stored and compared with data from the operation of stretching different animals pelts and in doing so establishing what is well known in the computer technical field an iterative learning process.
  • the measure for determining the safe maximum force to be applied to a pelt is, according to the teachings of the present invention, not determined by the length of the pelt but rather by the maximum force gradient and the force to be applied which values are consequently independent of the actual length of the pelt exposed to the stretching operation as such.
  • FIGS.7A-7E are shown schematic and vertical sectional views of the pelt board 26 having the pelt 14 applied to the pelt board and also indicating the imaginary line 20 indicating the length of the pelt generated while stretching the pelt as described above with reference to FIG.1-5 and generating the corresponding length and force data shown in FIG.6 .
  • FIG.7A illustrates the original length of the pelt 14 in its unstretched state, i.e. prior to applying any force to the pelt while the pelt is simply initially resting on the pelt board and afterwards exposed to a stretching force.
  • FIG.7B illustrates the pelt 14 stretched to the safe stretching value of FIG.B indicated by the dotted line illustrating the safe force applied and also the safe force gradient at the point B.
  • FIG.7D illustrates the upper limit or the safe upper limit of stretching the pelt as further stretching of the pelt exceeding the safe force gradient value determined in D causes the pelt to be broken as is illustrated in FIG.7E .
  • the graph of FIG.6 may be used for predicting as a forecast whether a specific maximum class has been reached or a safe further stretching may bring the pelt from the class presently obtained to a further class as it is to be realized that the incremental difference between the two classes is 6cm and the stretching of the pelt therefore should be carried out in order to reach the maximum class possible rather than reach the maximum length possible since stretching the pelt beyond a class limit without reaching the next class does not yield any financial pay off for the pelt in question.
  • the difference between L3 and L5 is 50 cm corresponding to more than 6 classes for which reason it is readily understood that the further extension or stretching of the pelt from B to D involves the increase of the length of approximately 100cm corresponding to more than 16 classes.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Treatment And Processing Of Natural Fur Or Leather (AREA)
EP15182654.2A 2015-03-25 2015-08-27 Procédé d'étirement d'une peau sur une planche à peau Ceased EP3135776A1 (fr)

Priority Applications (12)

Application Number Priority Date Filing Date Title
EP15182654.2A EP3135776A1 (fr) 2015-08-27 2015-08-27 Procédé d'étirement d'une peau sur une planche à peau
LT16711610T LT3274479T (lt) 2015-03-25 2016-03-22 Aparatai ir būdai, skirti ištempti kailį ant kailio plokštės
EP19191276.5A EP3620540A3 (fr) 2015-03-25 2016-03-22 Procédé d'étirement d'une peau sur une planche à peau
CN201680030170.1A CN107667181B (zh) 2015-03-25 2016-03-22 用于在毛皮板上拉伸毛皮的设备和方法
EP19172143.0A EP3553188A3 (fr) 2015-03-25 2016-03-22 Appareils et procédés pour étirer une peau sur une planche à peau
EP16711610.2A EP3274479B1 (fr) 2015-03-25 2016-03-22 Premier appareil et premier procédé destines a étirer une peau sur une planche à peau
DK16711610T DK3274479T3 (da) 2015-03-25 2016-03-22 Apparaturer og fremgangsmåder til strækning af et skind på en tane
PL16711610T PL3274479T3 (pl) 2015-03-25 2016-03-22 Urządzenia i sposoby rozciągania skóry na desce do skór
US15/561,223 US10745768B2 (en) 2015-03-25 2016-03-22 Apparatuses and methods for stretching a pelt on a pelt board
PCT/EP2016/056215 WO2016150938A1 (fr) 2015-03-25 2016-03-22 Appareils et procédés pour tendre une peau sur une planche à peaux
DKBA202000015U DK202000015Y3 (da) 2015-03-25 2020-02-24 Strækkeapparatur til strækning af et skind på en tane
US16/934,908 US11505839B2 (en) 2015-03-25 2020-07-21 Apparatuses and methods for stretching a pelt on a pelt board

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EP15182654.2A EP3135776A1 (fr) 2015-08-27 2015-08-27 Procédé d'étirement d'une peau sur une planche à peau

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Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK96890A (da) * 1990-04-18 1991-10-19 Bent Faarkrog Tanemaskine til udstraekning af minkskind
DK200001174A (da) 2000-08-04 2002-02-05 Hedegaard Jens Fremgangsmåde og maskine til ikke-destruktiv taning af skind
WO2002044428A1 (fr) 2000-11-28 2002-06-06 Majgaard Invest Aps Procede et machine permettant de tendre une fourrure sur des planches a fourrure
US20030019255A1 (en) 2000-02-25 2003-01-30 Jens Hedegaard Method and means for drying and fastening of stretched pelt on a peltingboard
WO2005028682A1 (fr) 2003-09-19 2005-03-31 Majgaard Invest Aps Procede et machine permettant l'etirage et la fixation non destructeurs d'une peau sur un panneau pour peau
WO2006026986A1 (fr) 2004-09-08 2006-03-16 Majgaard Invest A/S Procede et dispositif de fixation de l'extremite d'un nez d'une fourrure a l'extremite d'un nez sur un element de distension ou une planche a peausserie
WO2007033681A2 (fr) 2005-09-21 2007-03-29 Temora Import Export Ltd Procede et machine destines au depliage de la partie de la queue d'une peau lors de l'etirage des peaux sur des tables d'etirage
WO2008022644A1 (fr) 2006-08-25 2008-02-28 Dansk Mink Papir A/S Élément de type manchon/poche de forme tubulaire pour la fixation d'une peau de vison étirée, brossée à l'eau, sur une planche à peau, pendant le séchage du côté cuir de la peau de vison
WO2008025364A1 (fr) 2006-08-26 2008-03-06 Dansk Mink Papir A/S Procédé et machine pour exécuter le brossage à l'eau de peaux tannées
WO2012126467A1 (fr) 2011-03-22 2012-09-27 4M Globe Management Ltd. Machine et procédé permettant d'étirer une peau de fourrure avant de la fixer sur une plaque pour peau de fourrure
EP2818563A1 (fr) 2013-06-24 2014-12-31 Dansk Mink Papir A/S Contrôleur capillaire destiné à être monté sur une machine d'étirage pour étirer une peau sur une planche à peau
WO2015024788A1 (fr) 2013-08-22 2015-02-26 4M Globe Management Ltd. Appareil et procédé permettant d'étirer une peau sur une planche à peau

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK96890A (da) * 1990-04-18 1991-10-19 Bent Faarkrog Tanemaskine til udstraekning af minkskind
DK169525B1 (da) 1990-04-18 1994-11-21 Bent Faarkrog Tanemaskine til udstrækning af minkskind på taner
US20030019255A1 (en) 2000-02-25 2003-01-30 Jens Hedegaard Method and means for drying and fastening of stretched pelt on a peltingboard
DK200001174A (da) 2000-08-04 2002-02-05 Hedegaard Jens Fremgangsmåde og maskine til ikke-destruktiv taning af skind
WO2002044428A1 (fr) 2000-11-28 2002-06-06 Majgaard Invest Aps Procede et machine permettant de tendre une fourrure sur des planches a fourrure
WO2005028682A1 (fr) 2003-09-19 2005-03-31 Majgaard Invest Aps Procede et machine permettant l'etirage et la fixation non destructeurs d'une peau sur un panneau pour peau
WO2006026986A1 (fr) 2004-09-08 2006-03-16 Majgaard Invest A/S Procede et dispositif de fixation de l'extremite d'un nez d'une fourrure a l'extremite d'un nez sur un element de distension ou une planche a peausserie
WO2007033681A2 (fr) 2005-09-21 2007-03-29 Temora Import Export Ltd Procede et machine destines au depliage de la partie de la queue d'une peau lors de l'etirage des peaux sur des tables d'etirage
WO2008022644A1 (fr) 2006-08-25 2008-02-28 Dansk Mink Papir A/S Élément de type manchon/poche de forme tubulaire pour la fixation d'une peau de vison étirée, brossée à l'eau, sur une planche à peau, pendant le séchage du côté cuir de la peau de vison
WO2008025364A1 (fr) 2006-08-26 2008-03-06 Dansk Mink Papir A/S Procédé et machine pour exécuter le brossage à l'eau de peaux tannées
WO2012126467A1 (fr) 2011-03-22 2012-09-27 4M Globe Management Ltd. Machine et procédé permettant d'étirer une peau de fourrure avant de la fixer sur une plaque pour peau de fourrure
EP2818563A1 (fr) 2013-06-24 2014-12-31 Dansk Mink Papir A/S Contrôleur capillaire destiné à être monté sur une machine d'étirage pour étirer une peau sur une planche à peau
WO2015024788A1 (fr) 2013-08-22 2015-02-26 4M Globe Management Ltd. Appareil et procédé permettant d'étirer une peau sur une planche à peau

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