EP2450086B1 - Gleitbrett mit Legierungskern - Google Patents

Gleitbrett mit Legierungskern Download PDF

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Publication number
EP2450086B1
EP2450086B1 EP11306401.8A EP11306401A EP2450086B1 EP 2450086 B1 EP2450086 B1 EP 2450086B1 EP 11306401 A EP11306401 A EP 11306401A EP 2450086 B1 EP2450086 B1 EP 2450086B1
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EP
European Patent Office
Prior art keywords
core
gliding board
fibrous
holes
yarns
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.)
Active
Application number
EP11306401.8A
Other languages
English (en)
French (fr)
Other versions
EP2450086A1 (de
Inventor
Emmanuel Cassibba
Christophe Gerossier
Yann Malroux
Jacky Christoud
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.)
Skis Rossignol SA
Original Assignee
Skis Rossignol SA
Rossignol SA
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 Skis Rossignol SA, Rossignol SA filed Critical Skis Rossignol SA
Publication of EP2450086A1 publication Critical patent/EP2450086A1/de
Application granted granted Critical
Publication of EP2450086B1 publication Critical patent/EP2450086B1/de
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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
    • 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
    • A63C5/126—Structure of the core

Definitions

  • the invention relates to the field of gliding boards, especially boards sliding on snow. It relates more particularly to a new core structure, making it possible to confer good mechanical properties on the board, particularly in terms of compressive and flexural strength, and this, for a significantly reduced core density compared to the prior art. .
  • a gliding board comprises a core extending over almost the entire length of the board, and whose role is essentially to give the ski a thickness by separating mechanical reinforcements and keeping them at a distance from the neutral fiber.
  • These mechanical reinforcements may be of various constitutions, but a marked tendency is to favor fibrous reinforcements impregnated with thermosetting resin, which have the advantage of being easily configurable to the shape of the board, and in particular to three-dimensional configurations of the upper side.
  • the cores may consist either of a foam formed by the reaction of two components injected into the mold of the ski, during its molding, or by a cut and / or machined before it is molded.
  • the invention relates more specifically to this family of nuclei.
  • These cores can thus be of various materials, such as wood or a foam based on polymeric materials.
  • This core is therefore made in a pre-molding operation, and it is cut so that its outer contour corresponds to the desired volume, so as to separate sufficiently the fibrous reinforcements that come to its contact.
  • a gliding board core which has longitudinal recesses extending over most of its length. These recesses receive a textile element consisting of a nonwoven which is compressed to enter the recesses. This nonwoven is impregnated with a thermosetting resin, so that it forms rigid spacers, and more rigid than the material of the core itself, between the two fibrous reinforcements resting on the upper and lower faces of the core.
  • the pillars formed by these fibrous strands ensure a resistance to tearing, preventing fibrous reinforcements from delaminating in case of intense flexion of the core.
  • the objective of the invention is to provide a solution which ensures a strengthening of the core in compression, traction and shear, which is as homogeneous as possible to avoid the risk of crushing the core material, and this, by seeking maximum lightening.
  • the invention therefore relates to a gliding board having a core covered on both sides by fibrous reinforcing layers.
  • This core has rectilinear fibrous elements which pass right through it by being in contact with the two fibrous reinforcing layers.
  • these fibrous elements are rectilinear segments of threads which are stuck inside the material of the core and pass through holes formed during their insertion into the core, these threads being present in a proportion of at least one hole per square centimeter, and this on more than 50 cm 2 on the surface of the nucleus.
  • the core including the characteristic son, has an overall density of less than 120 kg / m 3 , preferably less than 100, and very preferably less than 70 kg / m 3 .
  • the invention consists in ensuring a bridging between the two faces of the core, and more specifically the two impregnated fibrous reinforcements, via a plurality of fibrous bridges, which are impregnated with thermosetting resin advantageously the same as that fibrous reinforcements, which are distributed homogeneously over a large part of the core surface.
  • thermosetting resin These son being stiffened by the thermosetting resin, they provide both a reinforcement in compression and also in tension, so that they maintain the integrity of the rest of the core material when it is stressed in bending but also in torsion .
  • the overall volume of the holes remains particularly low so that the impact of mechanical reinforcement by the characteristic son remains weakly sensitive to the overall weight of the core.
  • the mechanical properties of the core remain very homogeneous, and thus allow the use of very low density materials, of the order of a few tens of kilos per m 3 only, this which leads to particularly light gliding boards.
  • expanded foams and in particular polyurethane-based foams, but also very sparse woods, such as balsa or the like.
  • this material of the core may have a density of less than 100 kg / m 3 , preferably less than 80 kg / m 3 , and very preferentially less than 50 kg / m 3 , and in a preferred form, of the order of 35 kg / m 3 .
  • all or part of the holes formed by the passage of the characteristic son may have an inclination either substantially perpendicular to the main core plane, or still with an inclination substantially non-perpendicular to the core plane.
  • This inclination can be chosen according to the main deformation that will be experienced by the gliding board, so as to orient the fiber bridges optimally.
  • an angle of 45 ° is advantageous for countering shear forces of the core.
  • the core material undergo deformations during molding, in particular when it is a compressible material, or even thermoformable, in which case the initial inclination of the fibrous bridges can be modified after molding.
  • the fibrous bridges can then be found after molding in an optimal configuration to fulfill their mechanical function in a preferred manner.
  • the characteristic threads may protrude through holes that receive them in the core so as to come into contact with the impregnated fibrous layer.
  • the fibrous reinforcing layers are impregnated with a thermosetting resin which can thus migrate in the characteristic son by capillarity during molding, since it is in sufficient excess on these fibrous reinforcements.
  • a complementary layer such as a layer of a nonwoven impregnated with the same resin, can be interposed between the fibrous reinforcements and the core, so as to serve as resin reserve during molding.
  • the invention also covers other variants for which the threads themselves are previously impregnated with a resin, this resin hardening during the molding operation.
  • the core may comprise one or more continuous son sewn through the core.
  • the manufacture of the core can thus be greatly simplified, since the establishment of future fibrous bridges can be done on the low density material, before its machining and cutting to the shape of the core. These operations thus greatly limit the time and cost of manufacture.
  • the placement of the son occurs while the fibrous reinforcements have been arranged on the upper and / or lower faces of the core, so that the characteristic son also ensure the joining of the reinforcements to the intermediate layer of the core.
  • the characteristic yarns may be based on a material selected from the group consisting of glass fibers, carbon fibers, aramid fibers, basalt fibers and natural fibers.
  • the number of holes receiving a wire and opening on one of the faces of the core is between 0.3 and 5 holes per cm 2 , preferably between 0.5 and 3 holes per cm 2 , or very preferentially between 0, 7 and 2 holes per cm 2 .
  • the distribution of the holes may be constant but also variable on the surface of the core.
  • the densities mentioned above correspond to a representative surface of the core, which is at least 50 cm 2 , and preferably 500 cm 2 , corresponding to a substantial fraction of the surface of the board.
  • the invention covers variants in which this fibrous bridge density is present in a particular area only, while the rest of the core may not need this reinforcement, in which case the fibrous bridges are absent, or present to a lesser extent.
  • the diameter of the hole may advantageously be between 0.3 and 2 mm, corresponding substantially to the diameter of the needles which serve to insert the characteristic threads into the core.
  • the needles used during the needling may have various inclinations, and in particular a non-perpendicular inclination to the face of the layer where the son segments lie. It is also possible to implement yarns in several orientations, by a succession of needling operations with differently oriented needles.
  • the invention relates to a new core structure for gliding board, an example of which is illustrated in FIG. figure 1 .
  • a gliding board 1 comprises in a traditional manner a flange 2 edged with edges 3, and surmounted by one or more reinforcements in particular fibrous 4.
  • the gliding board also comprises an upper protective assembly 5 which directly or indirectly covers a or several reinforcements 6, in particular fibrous.
  • the two fibrous reinforcements 4, 6 are separated by a core 10 which, in the context of the invention, is made of a low density material, which may be for example a polyurethane foam or else any other material having a low density.
  • this core 10 is traversed by wires 20 which connect the upper 11 and lower 12 faces of the core while coming into contact with the fibrous reinforcements 6, 4.
  • the material of the core may be traversed by wire portions 21.
  • These wires 21 have zones 22 internal to the cores which are formed by driving the wire from the upper face 11 to the lower face 12, to form a or a plurality of rectilinear segments 23, 24 substantially perpendicular to the main plane of the core 10.
  • Some of these segments 23, 24 are connected by a portion 25 forming a flush loop on the lower face 12 of the core, and coming into contact with the lower fibrous reinforcement 4.
  • the son 21 On the opposite face, the son 21 have free ends 26 which come in contact with the upper fibrous reinforcement 6.
  • These segments 23, 24 of the wire thus pass through the core 10 through a hole 15 created during the insertion of the wire, and which has a diameter of the order of that of the wire 21.
  • FIG. 6 The realization of the core is illustrated in figure 6 , in which are observed on the side of the foam block, passages within which are present the segments 23,24 of son, and on both sides, the apparent areas 25, 26 of the wire 21, which will come into contact fibrous reinforcements 4,6.
  • This configuration corresponds to the case where during manufacture, the son which rest on the upper face are driven by needles whose end straddles the central part of the wire. In some cases, the forked end of the needle catches the wire rather close to one end, and the trained length is too short for a loop to form on the opposite side. Thus, only one segment passes through the core material.
  • the fibrous reinforcements 4, 6 are impregnated with a resin that comes into contact with the wire 21. More specifically, the portions 26 of the wire 21, present on the upper face 11 of the core come into contact with the underside of the reinforcement fibrous In the same way, the looping portions 25 present on the lower face 12 of the core 10 come into contact with the upper face of the lower fibrous reinforcement 4.
  • the resin present in the fibrous reinforcements 4, 6 migrates to completely impregnate the segments 23, 24 of the characteristic wire 21.
  • thermosetting resin When this resin is advantageously of thermosetting nature, the heat provided during the molding operation causes the polymerization of this resin. It is also possible to use a wire previously coated with a thermosetting resin, in a state that allows it to be manipulated and inserted into the core material.
  • fiber-based yarns having a high tenacity such as glass yarns, carbon or aramid yarns or the like can be used.
  • the resins employed may be of the thermosetting type and in particular of the epoxy type.
  • the optimization of this mechanical resistance can be achieved by the choice of the density of wires present inside the core.
  • a satisfactory mechanical strength is obtained when the distribution of the son is of the order of a few son per square decimeter.
  • the density of these wires can be modulated on the surface of the core, with higher concentrations in the areas mechanically stressed, such as in particular the proximity of the implantation of fasteners in the case of a surfboard or a ski.
  • the core 40 a material which has a deformation capacity, by compression so that during molding, it follows the three-dimensional shape that is desired to give the board, without the need for preform it by a machining operation.
  • the core is made from a block of constant thickness, which has son 41 present over the entire height of the core.
  • the thickness of the core 40 tends to decrease in certain areas 43, so that the characteristic son 42 rearrange, for example by settling inside the hole that accommodates them, or by seeing their inclination change, or by adopting a wavy form.
  • the core is shaped three-dimensionally before the molding operation, during a specific intervention through the use of a thermoformable material, or a machining operation.
  • the core 50 can be made with prior integration of the fibrous reinforcement layers 54, 56.
  • the insertion operation of the characteristic son 51 is through the fibrous reinforcement layers 54, 56 and the core 50 , so as to form a sandwich structure.
  • the fibrous reinforcement layers 54, 56 are associated with the core, which allows easier handling. The impregnation can thus take place directly on the complex previously made.
  • These threads are coated with an epoxy resin which, when it impregnates the threads by capillarity, gives an overall density of the core, integrating the impregnated threads of less than 120 kg / m 3 , preferably between 40 and 100 kg / m. 3 .
  • the core by impregnating the son specifically, even before the establishment of the core in the mold. It is possible to impregnate the threads, for example with a nonwoven layer forming a resin reservoir, so as to allow the resin to propagate in the threads by capillarity, before they come into contact with the fibrous reinforcements.
  • the structure of the core according to the invention thus provides boards particularly lighter, and having mechanical strengths particularly improved compared to existing boards. These boards can be used in various applications such as downhill skiing, Nordic skiing, or even snowboarding.

Landscapes

  • Moulding By Coating Moulds (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
  • Laminated Bodies (AREA)

Claims (11)

  1. Gleitbrett (1) mit einem Kern (10), der auf mindestens einer seiner beiden Seiten mit einer oder mehreren Verstärkungsfaserschicht/en (4, 6) überdeckt ist, wobei der Kern (10) geradlinige faserförmige Elemente besitzt, die ihn von einer Seite zur anderen durchqueren und dabei in Kontakt mit der mindestens einen Verstärkungsfaserschicht sind, dadurch gekennzeichnet, dass die faserförmigen Elemente Fadensegmente (23, 24) sind, die in das Material des Kerns eingezogen und in einem Anteil von mindestens 0,3 Fadensegmenten pro Quadratzentimeter über mehr als 50 cm2 vorhanden sind, wobei der Kern, der die faserförmigen Elemente enthält, eine Dichte von unter 120 kg/m3 aufweist.
  2. Gleitbrett nach Anspruch 1, dadurch gekennzeichnet, dass die Fadensegmente in Löcher eingezogen sind, deren Durchmesser kleiner als 2 Millimeter ist.
  3. Gleitbrett nach Anspruch 1, dadurch gekennzeichnet, dass das Material des Kerns aus der Gruppe ausgewählt ist, die geschäumte Schaumstoffe, insbesondere Schaumstoffe auf Polyurethanbasis, und Holz umfasst.
  4. Gleitbrett nach Anspruch 1, dadurch gekennzeichnet, dass alle oder ein Teil der Löcher, die durch den Durchtritt der Fäden (23, 24) gebildet sind, eine zur Hauptebene des Kerns im Wesentlichen senkrechte Neigung aufweisen/aufweist.
  5. Gleitbrett nach Anspruch 1, dadurch gekennzeichnet, dass alle oder ein Teil der Löcher, die durch den Durchtritt der Fäden (31) gebildet sind, eine zur Hauptebene des Kerns im Wesentlichen nicht senkrechte Neigung aufweisen/aufweist.
  6. Gleitbrett nach Anspruch 1, dadurch gekennzeichnet, dass die Fäden (21) über die Löcher hinausstehen und mit der oder den imprägnierten Verstärkungsfaserschicht/en in Kontakt kommen.
  7. Gleitbrett nach Anspruch 1, dadurch gekennzeichnet, dass die Fäden mit dem duroplastischen Harz imprägniert sind, das die Verstärkungsfaserschichten imprägniert.
  8. Gleitbrett nach Anspruch 1, dadurch gekennzeichnet, dass das Material des Kerns eine Dichte von unter 100 kg/m3, vorzugsweise unter 80 kg/m3, sehr bevorzugt unter 50 kg/m3 aufweist.
  9. Gleitbrett nach Anspruch 1, dadurch gekennzeichnet, dass der Kern, der die faserförmigen Elemente enthält, eine Gesamtdichte von unter 100 kg/m3, vorzugsweise unter 70 kg/m3 aufweist.
  10. Gleitbrett nach Anspruch 1, dadurch gekennzeichnet, dass die Anzahl von einen Faden aufnehmenden Löchern, die auf einer Seite des Kerns münden, zwischen 0,3 und 5 Löchern pro Quadratzentimeter, vorzugsweise zwischen 0,5 und 3 Löchern pro cm2, und sehr bevorzugt zwischen 0,7 und 2 Löchern pro cm2 beträgt.
  11. Gleitbrett nach Anspruch 1, dadurch gekennzeichnet, dass die Fäden auf Basis eines Materials sind, das aus der Gruppe ausgewählt ist, die Glasfasern, Carbonfasern, Aramidfasern, Naturfasern, Basaltfasern umfasst.
EP11306401.8A 2010-11-08 2011-10-28 Gleitbrett mit Legierungskern Active EP2450086B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1059212A FR2967080B1 (fr) 2010-11-08 2010-11-08 Planche de glisse comportant un noyau allege

Publications (2)

Publication Number Publication Date
EP2450086A1 EP2450086A1 (de) 2012-05-09
EP2450086B1 true EP2450086B1 (de) 2013-12-11

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EP11306401.8A Active EP2450086B1 (de) 2010-11-08 2011-10-28 Gleitbrett mit Legierungskern

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EP (1) EP2450086B1 (de)
FR (1) FR2967080B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015097326A1 (es) * 2013-12-27 2015-07-02 Quionne Tech S.L. Chasis de ρατiν, roller-esqui con dicho chasis y procedimiento de fabricacion de chasis de patin
TWI646999B (zh) * 2017-12-14 2019-01-11 葉宗殷 滑板結構

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6187411B1 (en) * 1996-10-04 2001-02-13 The Boeing Company Stitch-reinforced sandwich panel and method of making same
US6183000B1 (en) * 1996-12-04 2001-02-06 Alpitech S.R.L. Snowboard, surfboard, Monoski, water-ski and the like with very low weight and high mechanical strength
DE102005024408A1 (de) * 2005-05-27 2006-11-30 Airbus Deutschland Gmbh Verstärkung von Schaumwerkstoffen
DE102007003274B3 (de) * 2007-01-23 2008-06-19 Airbus Deutschland Gmbh Verfahren zum Verstärken eines Schaumwerkstoffs sowie Kernverbundbauteil
FR2918599B1 (fr) * 2007-07-13 2009-08-14 Chomarat Composites Soc Par Ac Produit textile pour structure sandwich et procede de fabrication
DE102008047408B4 (de) * 2008-09-05 2011-08-25 Gelbricht, Mike, 01774 Gleitbrett

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Publication number Publication date
FR2967080B1 (fr) 2012-11-16
FR2967080A1 (fr) 2012-05-11
EP2450086A1 (de) 2012-05-09

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