EP0083948A1 - Plaque moulée d'une composition résineuse à base acétale et fluorcarbone ainsi qu'un procédé de production de semelles de ski et autres articles à partir d'une telle plaque - Google Patents

Plaque moulée d'une composition résineuse à base acétale et fluorcarbone ainsi qu'un procédé de production de semelles de ski et autres articles à partir d'une telle plaque Download PDF

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Publication number
EP0083948A1
EP0083948A1 EP83200007A EP83200007A EP0083948A1 EP 0083948 A1 EP0083948 A1 EP 0083948A1 EP 83200007 A EP83200007 A EP 83200007A EP 83200007 A EP83200007 A EP 83200007A EP 0083948 A1 EP0083948 A1 EP 0083948A1
Authority
EP
European Patent Office
Prior art keywords
slab
ski
blend
fluorocarbon resin
acetal
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.)
Withdrawn
Application number
EP83200007A
Other languages
German (de)
English (en)
Inventor
Attilio Pronzati
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.)
MIKRAT Srl
Original Assignee
MIKRAT Srl
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 MIKRAT Srl filed Critical MIKRAT Srl
Publication of EP0083948A1 publication Critical patent/EP0083948A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63C—SKATES; SKIS; ROLLER SKATES; DESIGN OR LAYOUT OF COURTS, RINKS OR THE LIKE
    • A63C7/00—Devices preventing skis from slipping back; Ski-stoppers or ski-brakes
    • A63C7/06—Tooth-shaped running sole-plates
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63C—SKATES; SKIS; ROLLER SKATES; DESIGN OR LAYOUT OF COURTS, RINKS OR THE LIKE
    • A63C5/00—Skis or snowboards
    • A63C5/12—Making thereof; Selection of particular materials

Definitions

  • ski soles composed of mixed compounds of acetal resins and fluorocarbon resins such as polytetrafluoroethylene, which are particularly adapted to manufacture skis for long run contests because they considerably enhance the slipping of the ski on different kinds of snow, so that it becomes possible to dispence with ski waxing while ensuring concurrently a certain hold of the ski when a forward thrust is to be impressed thereto on the snow surface, while generally, due to the effect of the strong pressure exerted, the ski tends to slip backwards as it slips on the snowy surface,
  • ski soles are generally formed, after the prior art, by admixing by high-speed centrifuging and at a high temperature (140°C - 160°C) one resin with the other until an intimate and homogeneous blending thereof is achieved, whereafter estrusion or calendering of the homogeneous blend thus obtained are proceeded with, the blend having been previously granulated, to make ski soles in which the surface intended to contact the snow is absolutely smooth.
  • a high temperature 140°C - 160°C
  • the ski sole thus formed generally receives, cemented thereto on the surface away of the tread surface, a layer of fabric whereby the ski sole is fixed to the ski body with an adhesive.
  • the present invention it has now been found and quite surprisingly, that, as compared with a smooth tread surface of the kind specified above, it becomes possible to obtain characteristics of a well more satisfactory hold of the ski during the forward thrust stage and even improving the slipping and the speed of the ski when the thrusting force is released, using for the ski sole surface a slab made of a blend of acetal resin an fluorocarbonic resin, characterized in that it is so formed that on its tread surface a plurality of empty spaces is scattered which have, preferably, such a depth and such a diameter as to be substantially shallower than the tread sole thickness.
  • the shaping of a slab having such properties is carried out by a method which is characterized by comprising the steps of blending in the solid state said acetal resin with said fluorocarbon resin until obtaining a blend in which the two resins are but partially dispersed the one in the other heat treating said blend to originate granules and subjecting them to molding by extrusion or calendering to provide the finished slab.
  • the blending conditions are as follows: maximum temperature 70°C, rotational speed, selected in the range between 1800 and 3500 RPM approximately.
  • the blend so formed is fed to an extruder to give, at the outset, a granulation of the blend: the granules thus obtained are then sent to molding through the extruder die, wherefrom a continuous slab of the blend is withdrawn.
  • the extrusion temperature is comprised between 180°C and 22C°C.
  • a ski sole 11 made according to the invention is conventionally applied to a ski 12 with the intermediary of a supporting member 13, for example a layer of fiberglass fabric on which an adhesive 14 has been spread.
  • the ski sole 11 exiting the extruder exhibits in correspondence with the surface 15 intended to be the tread surface of the ski, a plurality of empty spaces 16 closely and randomly scattered on the surface 15 in question.
  • the depth and the diameter of the hollow spaces 16 are at any rate substantially less than the thickness of the ski sole 11.
  • the formation of the hollow spaces 16 is principally originated, as outlined above, to the only partial blending of the two resins in the initial stage of the process, which is cause by the low centrifugation speed and the comparatively low temperature, and, in part, also to the presence of moisture in the blender, so that the granule of the acetal resin cannot become intimately admixed with the powder of fluorocarbon resin, so that a blend which is not absolutely homogeneous is produced, when the granules of the blend with such a physical characteristic flows through the extrusion die, a slab having a corase physical structure is produced due to the presence of the hollow spaces as shown in the drawing.
  • plastics material slab produced according to the invention can be used as a tread surface also in applications other than those exemplified above and specific for the application in the ski field.
  • tread surfaces in footwear soles intended to contact wet surfaces, also other than the snowy ones and in which, at any rate, properties are called for such as a swift sliding forward when the thrust is released and a satisfactory adherence and holding ability in the rest stage in order to produce such a thrust.

Landscapes

  • Moulding By Coating Moulds (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
EP83200007A 1982-01-13 1983-01-05 Plaque moulée d'une composition résineuse à base acétale et fluorcarbone ainsi qu'un procédé de production de semelles de ski et autres articles à partir d'une telle plaque Withdrawn EP0083948A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT19095/82A IT1157251B (it) 1982-01-13 1982-01-13 Lastra prodotta per stampaggio di una mescola di resina acetalica e resina fluorocarbonica, atta a costituire una superficie battistrada quale una soletta per sci, procedimento per produrla ed articolo finito che la comprende
IT1909582 1982-01-13

Publications (1)

Publication Number Publication Date
EP0083948A1 true EP0083948A1 (fr) 1983-07-20

Family

ID=11154485

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83200007A Withdrawn EP0083948A1 (fr) 1982-01-13 1983-01-05 Plaque moulée d'une composition résineuse à base acétale et fluorcarbone ainsi qu'un procédé de production de semelles de ski et autres articles à partir d'une telle plaque

Country Status (4)

Country Link
EP (1) EP0083948A1 (fr)
FI (1) FI830124L (fr)
IT (1) IT1157251B (fr)
NO (1) NO830100L (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5624713A (en) * 1996-01-25 1997-04-29 Zardoz Llc Method of increasing lubricity of snow ski bases
EP2292283A1 (fr) 2009-09-04 2011-03-09 B. Braun Avitum AG Procédé et dispositif pour obtenir les paramètres physiologiques et détecter les anomalies cliniques et sous-cliniques durant un traitement de remplacement du rein

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2259629A1 (fr) * 1974-01-31 1975-08-29 Buttner Franz
AT338147B (de) * 1975-09-22 1977-07-25 Muller Edi Ski
DE2949688A1 (de) * 1979-12-11 1981-06-19 Fa. Helga Woditsch, 8229 Fridolfing Steighilfebelag zur anbringung an skiern
EP0033864A1 (fr) * 1980-02-12 1981-08-19 Franz Völkl GmbH & Co. Ski und Tennis Sportartikelfabrik KG Ski avec une semelle rugueuse en polyéthylène

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2259629A1 (fr) * 1974-01-31 1975-08-29 Buttner Franz
AT338147B (de) * 1975-09-22 1977-07-25 Muller Edi Ski
DE2949688A1 (de) * 1979-12-11 1981-06-19 Fa. Helga Woditsch, 8229 Fridolfing Steighilfebelag zur anbringung an skiern
EP0033864A1 (fr) * 1980-02-12 1981-08-19 Franz Völkl GmbH & Co. Ski und Tennis Sportartikelfabrik KG Ski avec une semelle rugueuse en polyéthylène

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5624713A (en) * 1996-01-25 1997-04-29 Zardoz Llc Method of increasing lubricity of snow ski bases
EP2292283A1 (fr) 2009-09-04 2011-03-09 B. Braun Avitum AG Procédé et dispositif pour obtenir les paramètres physiologiques et détecter les anomalies cliniques et sous-cliniques durant un traitement de remplacement du rein

Also Published As

Publication number Publication date
FI830124A7 (fi) 1983-07-14
FI830124A0 (fi) 1983-01-13
IT8219095A0 (it) 1982-01-13
FI830124L (fi) 1983-07-14
NO830100L (no) 1983-07-14
IT1157251B (it) 1987-02-11

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

Designated state(s): AT BE CH DE FR GB LI LU NL SE

17P Request for examination filed

Effective date: 19840110

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19860415

RIN1 Information on inventor provided before grant (corrected)

Inventor name: PRONZATI, ATTILIO