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
  • C14B1/00—Manufacture of leather; Machines or devices therefor
  • C14B1/26—Leather tensioning or stretching frames; Stretching-machines; Setting-out boards; Pasting boards
• • 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
  • C14B1/00—Manufacture of leather; Machines or devices therefor
  • C14B1/58—Drying

Definitions

• the invention relates to a method for stretching leather and similar flat materials, e.g. Skins, furs, but possibly also foil cuts and the like.
• the piece of leather is brought to rest on a support surface which is easy on the leather to slide on; b) the leather piece is acted upon with at least a part of the support surface distributed in the direction against the support surface acting pressure forces; c) for stretching the leather under sliding relative to the support surface, at least approximately tangentially with respect to a leather surface and at least approximately all-sided stretching forces directed towards the edge of the leather piece are brought into effect on at least part of the second surface of the leather piece.
• the invention is concerned with the implementation of further processing functions on the leather in connection with the stretch processing. This includes the combination of the
• Such a treatment device is preferably carried out in such a way that the support member forming the support surface consists at least partially of highly heat-conducting material, preferably metal, and is operatively connected to a conduction or convection heating device.
• a particularly important continuation of the task of the invention also aims at a combination of different work functions, namely that of stretching with drying.
• the associated solution is determined by the fact that a gap space accommodating the leather piece is formed between the support surface and the stretching tool and is connected to a suction device.
• a gap space accommodating the leather piece is formed between the support surface and the stretching tool and is connected to a suction device.
• FIG. 3 shows a partial vertical section in an edge region of a
• Membrane stretching tool with suction device and a supporting element with heating device, within a stretch drying machine on a larger scale
• FIG. 4 shows a partial vertical section corresponding to FIG. 3, but with a modified design of the stretching tool and the support member
• FIG. 5 again shows a partial vertical section corresponding to FIG. 3 for a membrane stretching tool and provided with a special work surface structure
• Stretch drying machine with modified carrying device In the stretching machine according to FIG. 1, there is an overall plate-shaped and arranged along a horizontal plane
• An essential component of the pressure and stretching tool ASW is an elastic stretchable membrane M1 covering the skin, which can be erected by means of a stretching drive device DAV maintenance of the pressure forces Pa in the normal direction to your
• the Dehn drive device DAV comprises a plurality of piston-cylinder units DZ arranged parallel to the membrane plane and distributed over the membrane circumference, the piston rods of which are fastened with rod heads SK edge of the membrane.
• Such an arrangement is known per se from DE-OS 30 10 003 and therefore requires no further illustration and explanation here.
• a conduction heating device HV is arranged on the underside of the support member TO1, e.g. in the
• Supporting element is made considerably easier or even made possible because, on the one hand, in the area of rigid solids - in contrast to the soft-flexible materials required for a membrane, suitable thermal conductivity values and heat transfer values are available and, on the other hand, there is no need to consider expansion properties. So overall an intense
• thermal connection between the heater and the leather can be achieved.
• a convection heater may also be used.
• a gaseous heating medium is circulated through the gap accommodating the leather.
• the support member TO is provided with a surface layer OST which forms the contact surface AF and is made of material which is highly slidable with respect to the leather.
• the surface layer preferably consists of a highly slidable plastic, in particular tetrafluoroethylene.
• the surface layer can also be provided with a fiber reinforcement. This favors a substantial further training of the surface layer
• OSM provided a pressure sensitive adhesive layer.
• a permeable membrane M2 with connection to a suction device is similar to FIG. 3
• the pore structure is contained in an elastically stretchable membrane surface layer OSM, which is releasably connected to a membrane base body GKM, to be precise - as with the support organ surface layer OST - by means of an adhesive layer HK.
• a Velcro fastener arrangement KV may also be used, as shown in FIG. 5 - there for example without a permeable membrane structure and suction device - for the detachable fastening of a surface layer provided with toothing-like structure Z is indicated in the area of the membrane working surface AO.
• Such a surface structure enables a positive transfer of the stretching forces to the leather and thus a particularly intensive stretching effect.

Landscapes

• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Treatment And Processing Of Natural Fur Or Leather (AREA)
• Treatment Of Fiber Materials (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6363978

Family Applications (1)

Country Status (12)

Families Citing this family (12)

Citations (7)

• 1988
  • 1988-09-29 DE DE3833068A patent/DE3833068A1/de active Granted
• 1989
  • 1989-08-25 WO PCT/EP1989/000998 patent/WO1990003448A1/de active IP Right Grant
  • 1989-08-25 BR BR898907630A patent/BR8907630A/pt not_active IP Right Cessation
  • 1989-08-25 EP EP89202523A patent/EP0365068B1/de not_active Expired - Lifetime
  • 1989-08-25 KR KR1019900701126A patent/KR900702055A/ko active IP Right Grant
  • 1989-08-25 ES ES198989202523T patent/ES2037402T3/es not_active Expired - Lifetime
  • 1989-08-25 EP EP89910848A patent/EP0436600B1/de not_active Expired - Lifetime
  • 1989-08-25 JP JP1509953A patent/JPH04500979A/ja active Pending
  • 1989-09-27 CN CN89107522A patent/CN1020474C/zh not_active Expired - Fee Related
  • 1989-09-27 PT PT91831A patent/PT91831B/pt not_active IP Right Cessation
  • 1989-09-28 CZ CS895517A patent/CZ281561B6/cs unknown
  • 1989-09-29 YU YU01891/89A patent/YU189189A/xx unknown
• 1993
  • 1993-03-09 GR GR930400519T patent/GR3007294T3/el unknown

Patent Citations (7)

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