WO1986004512A1 - 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
WO1986004512A1
WO1986004512A1 PCT/AT1986/000011 AT8600011W WO8604512A1 WO 1986004512 A1 WO1986004512 A1 WO 1986004512A1 AT 8600011 W AT8600011 W AT 8600011W WO 8604512 A1 WO8604512 A1 WO 8604512A1
Authority
WO
WIPO (PCT)
Prior art keywords
ski core
ski
core
core according
over
Prior art date
Application number
PCT/AT1986/000011
Other languages
German (de)
English (en)
Inventor
Herbert Woltron
Original Assignee
Isosport Verbundbauteile Ges.M.B.H.
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 Ges.M.B.H. filed Critical Isosport Verbundbauteile Ges.M.B.H.
Priority to DE8686901006T priority Critical patent/DE3680044D1/de
Priority to AT86901006T priority patent/ATE64867T1/de
Publication of WO1986004512A1 publication Critical patent/WO1986004512A1/fr

Links

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

  • Ski core made of plastic and ski containing this ski core
  • the invention relates to a ski core made of plastic with cavities for weight reduction, wherein, distributed over the ski core volume, there are void-free areas which each extend over the entire thickness of the ski core.
  • the invention further relates to a ski which contains the ski core according to the invention.
  • a ski core of the type mentioned above is described in AT-PS 251 465.
  • the ski core proposed there consists of pieces of tape made of thermoplastic material which are provided with longitudinal grooves and which are of double-wedge shape with a thickness varying in the length of the tape.
  • Several such plastic tape pieces are glued together to form a package and thus form the ski core having a double wedge shape.
  • These plastic tape pieces are now to be cut to length from an extruded tape in accordance with the aforementioned AT-PS, the variation of the tape thickness being achieved by varying the dimensions of the extrusion nozzles during the extrusion process.
  • the production of an extruded strand made of thermoplastic material with a cross-section that varies in the longitudinal direction of the strand has not yet been satisfactorily achieved.
  • the ski core proposed in AT-PS 251 456 has therefore not been used in practice.
  • the invention is based on the object of a ski to specify core made of plastic of the type mentioned at the outset, which can be produced in a particularly simple manner.
  • the ski core according to the invention is characterized in that it is produced from a layered or plate-shaped starting material, which consists of a fiber-mat-reinforced thermosetting or thermoplastic material, by extrusion molding, the relative cavity volume in the ski core being between 50 and 85, but is preferably between 65 to 75 vol.% and / or wherein the ski core side cheeks are preferably formed by the extrusion.
  • the ski core according to the invention is characterized in that it has a layer-like region lying over at least almost the entire ski core base surface, the course of which corresponds to the course of the parting line between the extrusion mold halves.
  • the average fiber content in the side cheeks formed by the extrusion is advantageously less than the average fiber content in the layered region.
  • the layer-shaped region borders over its entire extent or over part of its extent to the top or bottom of the ski core, it advantageously over part of its extent to the top and over one other part borders on the underside of the ski core and can advantageously have a wavy course between the top and bottom.
  • the cavity-free are Regions extending over the entire thickness of the ski are rib-shaped, advantageously several such rib-shaped regions are provided which cross one another.
  • the ski core according to the invention is characterized in that it has cylindrical cavities which each extend from the top or bottom of the ski core to the layered region.
  • thermoplastic plastic of the fiber mat-reinforced starting material is polyethylene terephthalate or a polyamide, or this plastic contains polyethylene terephthalate or a polyamide.
  • thermosetting plastic of the starting material is an epoxy resin or this plastic contains an epoxy resin.
  • the invention relates to a ski which contains a ski core according to the present invention.
  • FIGS. 1 and 2 show a first advantageous realization of the ski core according to the invention in two partial representations, namely FIG. 1 in a longitudinal section along the line 1-1 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 core of the core 5 to the layer-shaped 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 can 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 to produce the ski core or a ski core section, as is shown in FIG. 3 in a schematic cross-sectional partial representation in an 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, for example, 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 protrusions 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 protrusions 9 or in the edge region 15 of the molding space.
  • the compact is now 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. Since the glass fibers map 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 area 3 sets on average. This can be achieved by (see FIG. 3) increasing the distance between the edge 11 of the starting material strip 10 and the edge 12 of the sole 13 of the lower mold half 7. 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.
  • the ski core is produced on the basis of a thermoset plastic, in particular an epoxy resin.
  • a thermoset plastic in particular an epoxy resin.
  • This is advantageously based on a glass fiber mat impregnated with an epoxy resin hardener mixture, for the manufacture of which, for example, a needled glass fiber mat composed of continuous fibers with a basis weight of 600 g / m 2 with an epoxy resin hardener mixture, which is advantageously an epoxy resin based contains bisphenol A and a diaminic hardener, impregnated with an order of 500 g / m 2 (solid).
  • an extrusion mold is used, which is constructed similarly to that explained with reference to FIGS. 3 and 4.
  • a cut of the impregnated glass fiber mat is brought to a temperature of 120 ° C. very quickly, for example for one minute, and then introduced directly into the mold, which is kept at 140 ° C., which is then closed.
  • the material of the impregnated glass mat which, as described with reference to FIG. 4, finally fills the mold space completely, is left in the extrusion mold for about 4 minutes and hardened.
  • the compact is then hot-formed as a finished ski core or ski core section.
  • Such a ski core on the basis of glass fiber reinforced epoxy resin generally has a higher rigidity with an otherwise identical construction than can be achieved when using a thermoplastic synthetic resin.
  • This ski core is made up of two wedge-shaped half-cores that are connected to each other 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 1 f. 7 in the basics.
  • This ski half-core 18 has a layer-shaped region 22 which runs 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 regions 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 course 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)
  • Compositions Of Macromolecular Compounds (AREA)
  • Moulding By Coating Moulds (AREA)

Abstract

Un noyau (1, 18) de ski en matière plastique comprend des cavités (4) qui permettent d'alléger son poids et des zones pleines (23) distribuées sur le volume du noyau du ski; sur toute l'épaisseur du ski. Le noyau est formé par fluage à partir d'un produit de base stratifié ou laminaire composé d'une matière plastique duromère ou thermoplastique renforcée d'une natte fibreuse. Le noyau de ski (1, 18), dont les flasques (17, 24) peuvent être intégralement formées par fluage avec le noyau, présente de préférence une zone stratifiée (3, 22) s'étendant sur au moins presque toute la surface de base du noyau du ski; dont le tracé correspond au joint entre les demi-moules (7, 8) de formage par fluage. Cette zone stratifiée (3, 22) peut avec avantage être adjacente au côté supérieur ou au côté inférieur (5, 2) du noyau du ski, ou peut aussi suivre un tracé ondulant entre le côté supérieur et le côté inférieur (20, 21) du noyau de ski (18). Dans un mode préféré de réalisation, les cavités (4) peuvent avoir une forme cylindrique, les zones pleines (23) ayant respectivement la forme de nervures s'étendant sur toute l'épaisseur du noyau de ski. L'invention concerne également un ski contenant ce noyau de ski.
PCT/AT1986/000011 1985-02-07 1986-02-07 Noyau de ski en matiere plastique et ski contenant ce noyau WO1986004512A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE8686901006T DE3680044D1 (de) 1985-02-07 1986-02-07 Skikern aus kunststoff sowie diesen skikern enthaltender ski.
AT86901006T ATE64867T1 (de) 1985-02-07 1986-02-07 Skikern aus kunststoff sowie diesen skikern enthaltender ski.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA356/85 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 (1)

Publication Number Publication Date
WO1986004512A1 true WO1986004512A1 (fr) 1986-08-14

Family

ID=3488441

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AT1986/000011 WO1986004512A1 (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)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2720289A1 (fr) * 1994-05-31 1995-12-01 Gaillon Ski ou similaire.
WO2003008052A1 (fr) * 2001-07-10 2003-01-30 Fischer Gesellschaft M.B.H. Noyau leger et son procede de production
US7077418B2 (en) 2001-07-10 2006-07-18 Fischer Gesellschaft M.B.H. Light-weight construction core and a method for producing the same

Families Citing this family (2)

* 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

Citations (7)

* 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
DE2151944A1 (de) * 1970-10-23 1972-04-27 Bennett Brothers Associates In Gepresster Ski
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
US3970324A (en) * 1973-03-05 1976-07-20 American Marine Industries, Inc. Foam-filled, cellular structural product
DE2541073A1 (de) * 1975-09-15 1977-03-17 Voelkl Ohg Franz Ski mit einem einstueckigen kern

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT309282B (de) * 1970-03-02 1973-08-10 Head Sportgeraete Gmbh Kunststoffski

Patent Citations (7)

* 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
DE2151944A1 (de) * 1970-10-23 1972-04-27 Bennett Brothers Associates In Gepresster 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
DE2541073A1 (de) * 1975-09-15 1977-03-17 Voelkl Ohg Franz Ski mit einem einstueckigen kern

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2720289A1 (fr) * 1994-05-31 1995-12-01 Gaillon Ski ou similaire.
WO2003008052A1 (fr) * 2001-07-10 2003-01-30 Fischer Gesellschaft M.B.H. Noyau leger et son procede de production
US7077418B2 (en) 2001-07-10 2006-07-18 Fischer Gesellschaft M.B.H. Light-weight construction core and a method for producing the same

Also Published As

Publication number Publication date
JPS62501613A (ja) 1987-07-02
AT386959B (de) 1988-11-10
DE3680044D1 (de) 1991-08-08
EP0211050A1 (fr) 1987-02-25
ATE64867T1 (de) 1991-07-15
EP0211050B1 (fr) 1991-07-03
ATA35685A (de) 1988-04-15

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