EP0211050B1 - Ski core of plastic material and ski containing such a core - Google Patents

Ski core of plastic material and ski containing such a core 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
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EP
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Prior art keywords
ski
core
over
layered
mold
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EP86901006A
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German (de)
French (fr)
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EP0211050A1 (en
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Herbert Woltron
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Isosport Verbundbauteile GmbH
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Isosport Verbundbauteile GmbH
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    • 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.

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

Abstract

A ski core (1, 18) made of plastic material comprises cavities (4) which enable to reduce its weight and solid areas (23) distributed throughout the volume of the ski core, throughout the ski thickness. The core is flow formed from a stratified or laminated base product comprised of duromer or thermoplastic synthetic material reinforced by a fibre mat. The ski core (1, 18) of which the side pieces (17, 24) may be integrally formed by extrusion with the core, preferably presents a stratified area (3, 22) extending on at least almost all the base surface of the ski core of which the course corresponds to the junction between the extrusion half-moulds (7, 8). This stratified area (3, 22) may advantageously be adjacent to the upper side or the lower side (5, 2) of the ski core or may also follow an undulating course between the upper side and the lower side (20, 21) of the ski core (18). In a preferred embodiment, the cavities (4) may have a cylindrical shape, the solid areas (23) being respectively configured as ribs extending throughout the thickness of the ski core. The invention also relates to a ski comprising said ski core.

Description

Die Erfindung betrifft ein Verfahren zum Herstellen eines Skikerns aus Kunststoff mit Hohlräumen zur Gewichtsverminderung, wobei, über das Skikernvolumen verteilt, hohlraumfreie Bereiche bestehen, die sich jeweils über die ganze Skikerndicke erstrekken, bei dem ein schicht- oder plattenförmiges Ausgangsmaterial durch einen Preßvorgang in den Skikern übergeführt wird. Sie betrifft ferner einen nach diesem Verfahren hergestellten Skikern sowie einen Ski mit einem solchen Skikern.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.

Ein Verfahren der vorgenannten Art ist aus der FR-A-2 261 027 bekannt. Bei diesem bekannten Verfahren wird der Ski in zwei aufeinanderfolgenden Schritten in einer Preßform hergestellt. Im ersten Verfahrensschritt werden zwei streifenförmige Platten aus einem vernetzbaren thermoplastischen Material übereinander mit einer dazwischen liegenden Stahlblecheinlage in einer Preßform erwärmt und zu einem Skibauteil, der den mechanisch tragenden Obergurt und den Skikern umfaßt, unter Aushärtung oder Vulkanisierung des Kunststoffes verpreßt. Dazu werden aber die beim Aushärten bzw. Vulkanisieren üblichen, relativ langen Preßzeiten benötigt. Außerdem wird hier kein Skikern hergestellt, der weitgehend universell als Skibauteil in der Skifabrikation eingesetzt werden kann.A method of the aforementioned type is known from FR-A-2 261 027. In this known method, the ski is produced in a press mold in two successive steps. In 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. However, this requires the relatively long pressing times that are customary for curing or vulcanizing. In addition, no ski core is manufactured here, which can largely be used universally as a ski component in ski manufacture.

Hier will die Erfindung Abhilfe schaffen. Die Erfindung, wie sie in den Ansprüchen gekennzeichnet ist, löst die Aufgabe, ein einfach und rasch durchzuführendes Verfahren zum Herstellen eines Skikerns bzw. einen danach hergestellten Skikern anzugeben, wobei die erfindungsgemäß hergestellten Skikerne in üblicher Weise bei der Skifabrikation eingesetzt werden können.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.

Das erfindungsgemäße Verfahren ist nach Anspruch 1 dadurch gekennzeichnet, daß als schicht- oder plattenförmiges Ausgangsmaterial fasermattenverstärkter, thermoplastischer Kunststoff eingesetzt wird, der außerhalb der Preßform auf die erforderliche Verformungstemperatur aufgeheizt wird, dann in eine gekühlte Preßform eingebracht und durch Fließpressen in die Form des Skikerns überführt wird, und der geformte Körper anschließend in der Preßform abgekühlt wird.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.

Die Verwendung von thermoplastischen Kunststoffen, wie Polyäthylen oder Polyamid, ist zwar aus der bereits genannten FR-A 2 261 027 sowie aus der DE-A-25 41 073 an sich bekannt, doch dienen diese thermoplastischen Kunststoffe dort nicht als Materialien für den Skikern, sondern gemäß der FR-A als Material für einen Skilaufflächenbelag bzw. gemäß der DE-A als Material für Verstärkungsfasern für mit dem Kern kraftschlüssig verbundene Schichten hoher Festigkeit (mechanisch tragende Ober- und Untergurte).The use of thermoplastic materials, such as polyethylene or polyamide, is known per se from FR-A 2 261 027 and DE-A-25 41 073, but these thermoplastic materials do not serve as materials for the ski core there. but according to FR-A as material for a ski tread surface or according to DE-A as material for reinforcing fibers for layers of high strength that are non-positively connected to the core (mechanically load-bearing upper and lower belts).

Die Erfindung wird nachstehend anhand der Figuren näher erläutert.The invention is explained in more detail below with reference to the figures.

Die Figuren 1 und 2 zeigen eine erste vorteilhafte Realisierung des erfindungsgemäß hergestellten Skikerns in zwei Teildarstellungen und zwar Fig. 1 im Längsschnitt gemäß der Linie I-I in Fig. 2 und in Fig. 2 im Schnitt längs der Linie II-II in Fig. 1.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.

Der Skikern 1 weist an seiner Unterseite 2 angrenzend einen schichtförmigen Bereich 3 auf, der sich über die ganze Skikernbasisfläche erstreckt. Er enthält ferner gemäß einem regelmäßigen Raster angeordnete zylindrische Hohlräume 4, die sich von der Skikern-Oberseite 5 bis an den schichtförmigen Bereich 3 hin erstrecken. Die Figuren 1 und 2 zeigen den Skikern in einem mittleren Bereich, in dem er z.B. gegen das hintere Skiende zu (d.h. in Fig. 1 in Richtung des Pfeiles 6) in seiner Dicke keilförmig abnimmt.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.

Als Ausgangsmaterialien zur Herstellung der Skikerne dienen insbesondere Platten aus glasfasermattenverstärkten thermoplastischen Kunststoffen, die vorzugsweise aus einem Polyamid oder aus einem Polyäthylenterephthalat bestehen können. Dabei haben die eingesetzten Polyamidplatten vorzugsweise einen Glasgehalt im Bereich von 20 bis 40 Gew.%, während Polyäthylenterephthalatplatten vorzugsweise mit einem Glasgehalt im Bereich von 15 bis 35 Gew.% verwendet werden.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.

Die Herstellung des Skikerns gemäß der Figuren 1 und 2 sei nachstehend anhand der Figuren 3 bis 5 erläutert.The manufacture of the ski core according to FIGS. 1 and 2 is explained below with reference to FIGS. 3 to 5.

Zur Herstellung des Skikerns oder eines Skikernabschnittes dient eine Fließpreßform, wie sie in Fig. 3 in einer schematischen Querschnitts-Teildarstellung in geöffnetem Zustand gezeigt ist. Die Fließpreßform umfaßt eine als Matrize ausgebildete untere Formhälfte 7 und eine als Patrize wirkende obere Formhälfte 8 mit zylindrischen Vorsprüngen 9. Die beiden Formhälften werden durch Wasserkühlung auf Raumtemperatur gehalten.To produce the ski core or a ski core section, 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.

Ein auf Maß zugeschnittener Streifen 10 des Ausgangsmaterials aus einem glasmattenverstärkten Polyamid mit einem Glasgehalt von z.B. 30 Gew.% wird auf die Verformungstemperatur von 280°C gebracht. Bei dieser Temperatur ist das Matrixharz zwar an sich schon flüssig; der Glasfasergehalt hält den Streifen 10 aber in einem plastischen, gut hantierbaren Zustand.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.

Der Streifen 10 wird nun in die untere Formhälfte 7 eingelegt und dort fixiert. Er ist so zugeschnitten, daß sein Rand 11 nicht ganz bis zum Rand 12 der Sohle 13 der unteren Formhälfte 7 reicht. Unmittelbar nach dem Einlegen des Streifens 10 wird die Form durch Absenken der oberen Formhälfte 8 geschlossen, wobei die Schließzeit etwa 3 Sekunden beträgt. Fig. 4 zeigt die Form während des Schließvorganges. Die in den Ausgangsmaterialstreifen 10 eindringenden zylindrischen Vorsprünge 9 der oberen Formhälfte 8 verdrängen nun das Fließpreßmaterial, welches in den Zwischenräumen 14 zwischen den Vorsprüngen 9 bzw. im Randbereich 15 des Formraumes hochsteigt. Bei geschlossener Form, bei der der Rand 16 der oberen Formhälfte 8 in die untere Formhälfte 7 eintaucht, ist der Formraum schließlich durch das Fließpreßmaterial vollständig ausgefüllt.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. Immediately after the strip 10 has been inserted, 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. When the mold is closed, in which the edge 16 of the upper mold half 8 dips into the lower mold half 7, the molding space is finally completely filled by the extruded material.

Der Preßling wird nun etwa 30 Sekunden in der Form belassen, während er auf etwa 50°C auskühlt und dabei erstarrt, wonach er als fertiger Skikern 1 oder Skikernabschnitt, wie er in Fig. 5 im Querschnitt dargestellt ist, der Form entnommen wird.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.

Die Erfahrung hat gezeigt, daß bei dem beschriebenen Herstellungsbeispiel im fließgepreßten Material, z.B. bei einem Fließweg von 10 cm, der Glasfasergehalt nur um wenige Prozente absinkt. Da die Glasfasern sich an der Oberfläche des Preßlings abbilden, kann es in manchen Fällen vorteilhaft sein, den Glasfasergehalt in den Seitenwangen 17 des Skikerns 1, deren Oberflächen ja mit die äußere Oberfläche des Skis bilden, aus dekorativen Gründen niedriger zu halten, als er sich in dem schichtförmigen Skikern-Bereich 3 im Mittel einstellt. Dies kann dadurch erreicht werden, daß man (siehe Fig. 3) den Abstand des Randes 11 des Ausgangsmaterial-Streifens 10 vom Rand 12 der Sohle 13 der unteren Formhälfte 7 vergrößert. Der daraus resultierende größere Fließweg des Materials bedingt dann einen verringerten Glasfasergehalt in den Seitenwangen 17.Experience has shown that in the production example described in the extruded material, for example with a flow path of 10 cm, 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.

Verwendet man zum Herstellen des erfindungsgemäßen Skikerns als Matrixkunststoff Polyäthylenterephthalat, so können z.B. aus demselben Ausgangsmaterial, das bei derselben Verformungstemperatur von 300°C eingesetzt wird, durch unterschiedliche Abkühlbedingungen Skikerne mit unterschiedlichen mechanischen Eigenschaften erzeugt werden.If polyethylene terephthalate is used as matrix plastic to produce the ski core according to the invention, e.g. 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.

Bei der Verwendung einer wassergekühlten Form, die auf einer Temperatur im Bereich zwischen 10 und 30°C gehalten wird, erhält man aus einem plattenförmigen Ausgangsmaterial aus glasfasermattenverstärktem Polyäthylenterephthalat einen Preßling, in dem sich das Matrixharz wegen der relativ raschen Abkühlung in einer weitgehend amorphen Struktur verfestigt. Aufgrund dieser amorphen Struktur des Matrixharzes weist der Skikern eine hohe Elastizität auf.When using a water-cooled mold, which is kept at a temperature in the range between 10 and 30 ° C, 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.

Will man hingegen einen Skikern mit einer höheren mechanischen Steifigkeit herstellen, kann man dies dadurch realisieren, daß man beim Fließpressen desselben Ausgangsmaterials eine beheizte Form verwendet, die auf einer Temperatur von etwa 150°C gehalten wird. Der Preßling wird dabei also relativ langsam auf eine Temperatur, die etwas über 150°C liegt, abgekühlt, wobei das Matrixharz in eine weitgehend kristalline Struktur übergeht, aufgrund der dann die höhere Steifigkeit des Skikerns resultiert.If, on the other hand, you want to produce a ski core with a higher mechanical rigidity, this can be achieved by using a heated mold when extruding the same starting material, which mold is kept at a temperature of about 150 ° C. The compact is cooled relatively slowly to a temperature slightly above 150 ° C, the matrix resin changing into a largely crystalline structure, which then results in the higher rigidity of the ski core.

Eine zweite vorteilhafte Realisierung des erfindungsgemäßen Skikerns sei nachstehend anhand der Figuren 6 bis 8 erlaütert. Dieser Skikern ist aus zwei keilformïg ausgebildeten Halbkernen aufgebaut, die an ihren stärkeren Enden miteinander verbunden werden.A second advantageous realization of the invention Ski core is explained below with reference to Figures 6 to 8. This ski core is made up of two wedge-shaped half-cores that are joined together at their stronger ends.

Die Figuren 6 und 7 zeigen nun einen dieser beiden Ski-Halbkerne 18 in zwei Teildarstellungen im Bereich des stärkeren Endes 19 und zwar Fig. 6 im Längsschnitt gemäß der linie VI-VI in Fig. 7 und in Fig. 7 im Grundriß.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.

Dieser Ski-Halbkern 18 weist einen zwischen seiner Oberund Unterseite 20, 21 in Trapezwellenform verlaufenden schichtförmigen Bereich 22 auf, der sich über seine ganze Basisfläche erstreckt. Außerdem umfaßt er in Skilängsrichtung verlaufende rippenförmige Bereiche 23 sowie Seitenwangen 24, die sich jeweils über die ganze Skikerndikke erstrecken. Fig. 8 zeigt den Ski-Halbkern 18 in einer Längsschnitt-Teildarstellung im Bereich seines schwächeren Endes 25.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.

Zur Herstellung dieses Ski-Halbkerns 18 dient eine Fließpreßform, bei welcher, analog wie anhand der Figuren 3 und 4 erläutert, die Trennfuge zwischen den Fließpreßformhälften dem Verlaub des schichtförmigen Bereiches 22 entspricht.To produce this ski half-core 18, 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.

In Abänderung dieser zweiten vorteilhaften Realisierung des Skikerns können die Halbkerne statt der in Skilängserstreckung verlaufenden rippenförmigen Bereiche 23 rippenförmige Bereiche aufweisen, die schräg zur Skilängserstreckung verlaufen. In diesem Falle bilden diese rippenförmigen Bereiche zwei Gruppen jeweils zueinander parallel verlaufenden Rippen, wobei jeweils eine Rippe der einen Gruppe mehrere Rippen der anderen Gruppe kreuzt.In a modification of this second advantageous realization of the ski core, instead of the rib-shaped regions 23 which run in the longitudinal direction of the ski, the half-cores can have rib-shaped regions which run obliquely to the longitudinal direction of the ski. In this case, 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.

Ein unter Verwendung solcher Halbkerne aufgebauter Ski weist dann eine höhere Torsionssteifigkeit auf als ein Ski mit Halbkernen gemäß der Figuren 6 und 7.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.

Der erfindungsgemäße Skikern, bei dessen Herstellung in vorteilhafter Weise praktisch kein Materialabfall entsteht, eignet sich vorzugsweise für eine Massenproduktion. Wegen der weitgehenden Freiheit in der Formgebung können seine mechanischen Eigenschaften besser an die an den fertigen Ski gestellten Anforderungen angepaßt werden, als es bei den bis jetzt bekannten Skikernen der Fall ist. Der erfindungsgemäße Skikern hat auch den Vorteil, daß er gleich gemeinsam mit den Skikern-Seitenwangen in demselben Arbeitsgang hergestellt werden kann.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.

Claims (14)

1. Process for the production of a ski-core of plastic material, this core having hollow spaces to reduce the weight, with zones free of hollow spaces, which, distributed over the ski-core, each extend over the entire thickness of the ski-core, whereby in this process layered- or plate shaped base material is transformed into the ski-core by a molding operation, characterized by that as layered- or plate shaped material a fiber-matting reinforced thermoplastic material is used, which is heated outside of the mold to the necessary deforming temperature, thereafter is inserted into a cooled mold and transformed by stamp molding to the shape of the ski-core, and thereafter the so formed body being cooled down within the mold.
2. Process according to claim 1, characterized by that the side walls (17, 24) of the ski-core are also formed by the stamp molding.
3. Process according to claim 1 or 2, characterized by that the thermoplastic material of the base material is or contains polyethylene terephthalate.
4. Process according to claim 1 or 2, characterized by that the thermoplastic material of the base material is or contains a polyamide.
5. Ski-core produced according to one of the claims 1 through 4, characterized by that the relative hollow-space volume in the ski-core (1, 18) amounts to between 50 and 80, but preferably between 65 and 75% by volume.
6. Ski-core produced according to one of the claims 1 through 4 or according to claim 5, characterized by that it has a layered zone (3, 22) over at least nearly the entire basal area of the ski-core, the course of which corresponds to the course of the parting line between the stamp mold parts (7, 8).
7. Ski-core according to claim 6, characterized by that the average fiber content in the side walls simultaneously formed by the stamp molding is lower than the average fiber content in the layered zone (3, 22).
8. Ski-core according to claim 6 or 7, characterized by that the layered zone (3, 22) borders over its entire extension or over a part of its extension on the upper or bottom side of the ski-core.
9. Ski-core according to claim 8, characterized by that the layered zone (22) borders over a part of its extension on the upper side (20) and over another part on the bottom side (21) of the ski-core (18).
10. Ski-core according to claim 9, characterized by that the layered zone displays an undulated course between the upper and bottom side (20, 21).
11. Ski-core produced according to one of the claims 1 through 4 or according to one of the claims 5 through 10, characterized by that the zones free of hollow spaces (23) extending over the entire thickness of the ski-core are rib-shaped in form.
12. Ski-core according to claim 11, characterized by that several such rib-shaped zones are provided, which intersect.
13. Ski-core produced according to one of the claims 1 through 4 or according to one of the claims 5 through 12, characterized by that it has cylindrical hollow spaces (4) each extending from the upper or bottom side (5) of the ski-core (1) to the layered zone (3).
14. Ski, characterized by that it contains a ski-core produced according to one of the claims 1 through 4 or according to one of the claims 5 through 13.
EP86901006A 1985-02-07 1986-02-07 Ski core of plastic material and ski containing such a core Expired - Lifetime EP0211050B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0035685A AT386959B (en) 1985-02-07 1985-02-07 METHOD FOR PRODUCING A COMPONENT FOR A SKI CORE, COMPONENT PRODUCED WITH THIS METHOD, AND SKI WITH SUCH A COMPONENT
AT356/85 1985-02-07

Publications (2)

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

Family

ID=3488441

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86901006A Expired - Lifetime EP0211050B1 (en) 1985-02-07 1986-02-07 Ski core of plastic material and ski containing such a core

Country Status (5)

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

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT399819B (en) * 1991-04-17 1995-07-25 Pichler Hubert Ski with reduced flexural vibrations
US5848800A (en) * 1993-06-09 1998-12-15 Kastle Aktiengesellschaft Ski
FR2720289B1 (en) * 1994-05-31 1996-08-23 Gaillon Ski or similar.
US7077418B2 (en) 2001-07-10 2006-07-18 Fischer Gesellschaft M.B.H. Light-weight construction core and a method for producing the same
AT410517B (en) * 2001-07-10 2003-05-26 Fischer Gmbh LIGHTWEIGHT CORE AND 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 (en) * 1960-04-20 1961-02-17 Metallic ski
FR1453516A (en) * 1965-08-13 1966-06-03 Honeycomb ski
FR2005056A1 (en) * 1968-03-29 1969-12-05 Bader Albert
AT309282B (en) * 1970-03-02 1973-08-10 Head Sportgeraete Gmbh Plastic skis
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 (en) * 1975-09-15 1980-11-20 Franz Voelkl Ohg, 8440 Straubing Ski with a one-piece wooden core and method of manufacturing the same

Also Published As

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

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