EP0211050B1 - Noyau de ski en matiere plastique et ski contenant ce noyau - Google Patents

Noyau de ski en matiere plastique et ski contenant ce noyau Download PDF

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Publication number
EP0211050B1
EP0211050B1 EP86901006A EP86901006A EP0211050B1 EP 0211050 B1 EP0211050 B1 EP 0211050B1 EP 86901006 A EP86901006 A EP 86901006A EP 86901006 A EP86901006 A EP 86901006A EP 0211050 B1 EP0211050 B1 EP 0211050B1
Authority
EP
European Patent Office
Prior art keywords
ski
core
over
layered
mold
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.)
Expired - Lifetime
Application number
EP86901006A
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German (de)
English (en)
Other versions
EP0211050A1 (fr
Inventor
Herbert Woltron
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.)
Isosport Verbundbauteile GmbH
Original Assignee
Isosport Verbundbauteile GmbH
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 Isosport Verbundbauteile GmbH filed Critical Isosport Verbundbauteile GmbH
Publication of EP0211050A1 publication Critical patent/EP0211050A1/fr
Application granted granted Critical
Publication of EP0211050B1 publication Critical patent/EP0211050B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • A63C5/00—Skis or snowboards
    • A63C5/12—Making thereof; Selection of particular materials

Definitions

  • the invention relates to a method for producing a ski core made of plastic with cavities for weight reduction, wherein, distributed over the ski core volume, there are void-free areas, each of which extends over the entire thickness of the ski core, in which a layered or plate-shaped starting material by a pressing process in the ski core is transferred. It also relates to a ski core produced by this method and a ski with such a ski core.
  • a method of the aforementioned type is known from FR-A-2 261 027.
  • the ski is produced in a press mold in two successive steps.
  • the first process step two strip-shaped plates made of a cross-linkable thermoplastic material are heated one above the other with a steel sheet insert in between and pressed into a ski component, which comprises the mechanically supporting upper flange and the ski core, with hardening or vulcanization of the plastic.
  • a ski component which comprises the mechanically supporting upper flange and the ski core, with hardening or vulcanization of the plastic.
  • this requires the relatively long pressing times that are customary for curing or vulcanizing.
  • no ski core is manufactured here, which can largely be used universally as a ski component in ski manufacture.
  • the invention seeks to remedy this.
  • the invention as characterized in the claims, achieves the object of specifying a method for producing a ski core or a ski core which is produced in a simple and rapid manner, the ski cores produced according to the invention being able to be used in a customary manner in ski manufacture.
  • the inventive method is thereby according to claim 1 characterized in that fiber-mat-reinforced, thermoplastic plastic is used as the layered or plate-shaped starting material, which is heated outside the mold to the required deformation temperature, then introduced into a cooled mold and converted into the shape of the ski core by extrusion molding, and the molded body is subsequently molded into the mold is cooled.
  • thermoplastic materials such as polyethylene or polyamide
  • FR-A as material for a ski tread surface
  • DE-A material for reinforcing fibers for layers of high strength that are non-positively connected to the core (mechanically load-bearing upper and lower belts).
  • FIGS. 1 and 2 show a first advantageous realization of the ski core produced according to the invention in two partial representations, namely FIG. 1 in a longitudinal section along the line II in FIG. 2 and in FIG. 2 in a section along the line II-II in Fig. 1.
  • the ski core 1 has on its underside 2 adjoining a layer-shaped region 3 which extends over the entire base area of the ski core. It also contains cylindrical cavities 4 arranged according to a regular grid, which extend from the ski core top 5 to the layer-like region 3.
  • Figures 1 and 2 show the ski core in a central area in which it e.g. towards the rear end of the ski (i.e. in Fig. 1 in the direction of arrow 6) decreases in thickness in a wedge shape.
  • the starting materials for the production of the ski cores are, in particular, plates made of glass fiber reinforced thermoplastic materials, which may preferably consist of a polyamide or a polyethylene terephthalate.
  • the polyamide sheets used preferably have a glass content in the range from 20 to 40% by weight, while polyethylene terephthalate sheets are preferably used with a glass content in the range from 15 to 35% by weight.
  • an extrusion mold is used, as shown in FIG. 3 in a schematic partial cross-sectional view in the open state.
  • the extrusion mold comprises a lower mold half 7 designed as a female mold and an upper mold half 8 acting as a male mold with cylindrical projections 9.
  • the two mold halves are kept at room temperature by water cooling.
  • a tailor-made strip 10 of the starting material made of a glass mat reinforced polyamide with a glass content of e.g. 30% by weight is brought to the deformation temperature of 280 ° C. At this temperature, the matrix resin itself is already liquid; the glass fiber content keeps the strip 10 in a plastic, easy to handle condition.
  • the strip 10 is now inserted into the lower mold half 7 and fixed there. It is cut so that its edge 11 does not extend all the way to the edge 12 of the sole 13 of the lower mold half 7.
  • the mold is closed by lowering the upper mold half 8, the closing time being approximately 3 seconds.
  • Fig. 4 shows the shape during the closing process.
  • the cylindrical projections 9 of the upper mold half 8 penetrating into the starting material strips 10 now displace the extruded material which rises in the spaces 14 between the projections 9 or in the edge region 15 of the molding space.
  • the compact is then left in the mold for about 30 seconds while it cools to about 50 ° C. and solidifies, after which it is removed from the mold as a finished ski core 1 or ski core section, as shown in cross section in FIG. 5.
  • the glass fiber content only drops by a few percent. Because the glass fibers are on the surface of the compact, it can be advantageous in some cases to keep the glass fiber content in the side cheeks 17 of the ski core 1, the surfaces of which form the outer surface of the ski, for decorative reasons than it is in the layered ski core region 3 on average. This can be achieved in that (see FIG. 3) the distance of the edge 11 of the starting material strip 10 from the edge 12 of the sole 13 of the lower mold half 7 is increased. The resulting larger flow path of the material then results in a reduced glass fiber content in the side walls 17.
  • ski cores with different mechanical properties can be produced from the same starting material, which is used at the same deformation temperature of 300 ° C, under different cooling conditions.
  • a compact is obtained from a plate-shaped starting material made of glass fiber mat-reinforced polyethylene terephthalate, in which the matrix resin solidifies in a largely amorphous structure due to the relatively rapid cooling . Due to this amorphous structure of the matrix resin, the ski core has a high elasticity.
  • This ski core is made up of two wedge-shaped half-cores that are joined together at their stronger ends.
  • FIGS. 6 and 7 now show one of these two ski half-cores 18 in two partial representations in the region of the stronger end 19, namely FIG. 6 in a longitudinal section along the line VI-VI in FIG. 7 and in FIG. 7 in plan.
  • This ski half-core 18 has a layer-shaped region 22 which extends in a trapezoidal wave shape between its upper and lower sides 20, 21 and extends over its entire base surface. In addition, it comprises rib-shaped areas 23 extending in the longitudinal direction of the ski and side cheeks 24, each of which extends over the entire length of the ski. 8 shows the half ski core 18 in a partial longitudinal section in the region of its weaker end 25.
  • an extrusion mold is used, in which, analogously as explained with reference to FIGS. 3 and 4, the parting line between the extrusion mold halves corresponds to the permeability of the layered region 22.
  • the half-cores can have rib-shaped regions which run obliquely to the longitudinal direction of the ski.
  • these rib-shaped regions form two groups of ribs running parallel to one another, one rib of one group crossing several ribs of the other group.
  • a ski constructed using such half cores then has a higher torsional rigidity than a ski with half cores according to FIGS. 6 and 7.
  • the ski core according to the invention in the production of which practically no material waste advantageously occurs, is preferably suitable for mass production. Because of the extensive freedom in terms of shape, its mechanical properties can be better adapted to the requirements placed on the finished ski than is the case with the ski cores known to date.
  • the ski core according to the invention also has the advantage that it can be produced together with the ski core sidewalls in the same operation.

Landscapes

  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Laminated Bodies (AREA)
  • Moulding By Coating Moulds (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Claims (14)

1. Procédé de fabrication d'une âme de ski en matière plastique munie de cavités pour en diminuer le poids, des zones exemptes de cavités étant réparties sur tout le volume de l'âme du ski et s'étendant chacune sur toute l'épaisseur de l'âme du ski, dans lequel un matériau de départ stratifié ou en forme de plaques est transféré par pressage dans l'âme du ski, caractérisé en ce que l'on insère, comme matériau de départ stratifié ou en forme de plaques, de la matière synthétique thermoplastique renforcée par des nattes ou treillis de fibres, cette matière étant chauffée à la température de formage nécessaire, hors de l'ensemble de matrice, puis chargée dans un moule de pressage réfrigéré et transformée par extrusion en forme d'âme de ski, le corps formé étant ensuite refroidi dans le moule de pressage.
2. Procédé selon la revendication 1, caractérisé en ce que les parois latérales (17, 24) de l'âme du ski sont réalisées au cours de l'extrusion.
3. Procédé selon la revendication 1 ou 2, caractérisé en ce que le matériau synthétique thermoplastique du matériau de départ renforcé de nattes ou treillis de fibres est ou contient du polyéthylènetérephtalate.
4. Procédé selon la revendication 1 ou 2, caractérisé en ce que le matériau synthétique thermoplastique de départ renforcé de nattes ou treillis de fibres est ou bien contient un polyamide.
5. Ame de ski fabriquée d'après un procédé selon l'une des revendications 1 à 4, caractérisée en ce que le volume relatif des cavités dans l'âme du ski (1, 18) est compris entre 50 et 80, mais de préférence, entre 65 et 75% en volume.
6. Ame de ski fabriquée d'après un procédé selon l'une des revendications 1 à 4 ou selon la revendication 5, caractérisée en ce que l'âme du ski comporte une zone stratifiée (3, 22) s'étendant sur au moins presque toute la surface de base de l'âme du ski, et dont le profil correspond au profil du plan de joint situé entre les deux moitiés (7, 8) du moule d'extrusion.
7. Ame de ski selon la revendication 6, caractérisée en ce que la teneur en fibres, en section transversale, est inférieure, dans les parois latérales (17, 24), formées lors de l'extrusion, à la teneur en fibres en section transversale, dans la zone stratifiée (3, 22).
8. Ame de ski selon la revendication 6 ou 7, caractérisée en ce que la zone stratifiée (3, 11) délimite, sur tout ou partie se son étendue, la face supérieure ou la face inférieure de l'âme du ski.
9. Ame de ski selon la revendication 8, caractérisée en ce que la zone stratifiée (22) délimite, sur une partie de son étendue, la face supérieure (20) et, sur une autre partie, la face inférieure (21) de l'âme du ski (18).
10. Ame de ski selon la revendication 9, caractérisée en ce que la zone stratifiée (22) présente un cours en forme d'ondes entre les faces supérieure et inférieure (20, 21).
11. Ame de ski fabriqué d'après un procédé selon l'une des revendications 1 à 4 ou bien selon l'une des revendications 5 à 10, caractérisée en ce que les zones (23) exemptes de cavités et qui s'étendent sur toute l'épaisseur de l'âme du ski présentent une forme nervurée.
12. Ame de ski selon la revendication 11, caractérisée en ce qu'elle comporte plusieurs desdites zones nervurées qui se croisent les unes les autres.
13. Ame de ski fabriquée d'après un procédé selon l'une des revendications 1 à 4 ou bien selon l'une des revendications 5 à 12, caractérisée en ce qu'elle comporte des cavités cylindriques (4) qui s'étendent chacune depuis la face supérieure ou inférieure (5) de l'âme (1) du ski jusqu'à la zone stratifiée (3).
14. Ski caractérisé en ce qu'il comporte une âme de ski fabriquée d'après un procédé selon les revendications 1 à 4 ou bien selon l'une des revendications 5 à 13.
EP86901006A 1985-02-07 1986-02-07 Noyau de ski en matiere plastique et ski contenant ce noyau Expired - Lifetime EP0211050B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT356/85 1985-02-07
AT0035685A AT386959B (de) 1985-02-07 1985-02-07 Verfahren zur herstellung eines bauteils fuer einen skikern, mit diesem verfahren hergestellter bauteil sowie ski mit einem solchen bauteil

Publications (2)

Publication Number Publication Date
EP0211050A1 EP0211050A1 (fr) 1987-02-25
EP0211050B1 true EP0211050B1 (fr) 1991-07-03

Family

ID=3488441

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86901006A Expired - Lifetime EP0211050B1 (fr) 1985-02-07 1986-02-07 Noyau de ski en matiere plastique et ski contenant ce noyau

Country Status (5)

Country Link
EP (1) EP0211050B1 (fr)
JP (1) JPS62501613A (fr)
AT (2) AT386959B (fr)
DE (1) DE3680044D1 (fr)
WO (1) WO1986004512A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT399819B (de) * 1991-04-17 1995-07-25 Pichler Hubert Ski mit verminderten biegeschwingungen
US5848800A (en) * 1993-06-09 1998-12-15 Kastle Aktiengesellschaft Ski
FR2720289B1 (fr) * 1994-05-31 1996-08-23 Gaillon Ski ou similaire.
AT410517B (de) * 2001-07-10 2003-05-26 Fischer Gmbh Leichtbaukern und verfahren zur herstellung desselben
US7077418B2 (en) 2001-07-10 2006-07-18 Fischer Gesellschaft M.B.H. Light-weight construction core and a method for producing the same

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1254377A (fr) * 1960-04-20 1961-02-17 Ski métallique
FR1453516A (fr) * 1965-08-13 1966-06-03 Ski alvéolé
FR2005056A1 (fr) * 1968-03-29 1969-12-05 Bader Albert
AT309282B (de) * 1970-03-02 1973-08-10 Head Sportgeraete Gmbh Kunststoffski
US3734519A (en) * 1970-10-23 1973-05-22 W Bennett Molded ski
US3970324A (en) * 1973-03-05 1976-07-20 American Marine Industries, Inc. Foam-filled, cellular structural product
FR2261027A1 (en) * 1974-02-19 1975-09-12 Baudou Antoine Method of mfg. skis by moulding in two stages - uses mesh core and metallic reinforcing being included
DE2541073C3 (de) * 1975-09-15 1980-11-20 Franz Voelkl Ohg, 8440 Straubing Ski mit einem einstückigen Holzkern und Verfahren zur Herstellung desselben

Also Published As

Publication number Publication date
EP0211050A1 (fr) 1987-02-25
DE3680044D1 (de) 1991-08-08
JPS62501613A (ja) 1987-07-02
AT386959B (de) 1988-11-10
WO1986004512A1 (fr) 1986-08-14
ATE64867T1 (de) 1991-07-15
ATA35685A (de) 1988-04-15

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