EP0729769A1 - Verfahren zur Herstellung einer Spritzgussstruktur - Google Patents

Verfahren zur Herstellung einer Spritzgussstruktur Download PDF

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Publication number
EP0729769A1
EP0729769A1 EP96102251A EP96102251A EP0729769A1 EP 0729769 A1 EP0729769 A1 EP 0729769A1 EP 96102251 A EP96102251 A EP 96102251A EP 96102251 A EP96102251 A EP 96102251A EP 0729769 A1 EP0729769 A1 EP 0729769A1
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EP
European Patent Office
Prior art keywords
molded structure
manufacturing
structure according
mold
section
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP96102251A
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English (en)
French (fr)
Inventor
Pierre Garcin
Benoît Saillet
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.)
Salomon SAS
Original Assignee
Salomon SAS
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Filing date
Publication date
Application filed by Salomon SAS filed Critical Salomon SAS
Publication of EP0729769A1 publication Critical patent/EP0729769A1/de
Withdrawn legal-status Critical Current

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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 of manufacturing a molded structure in the form of an elongated beam. More particularly, it relates to the manufacture of skis, snowboards and other similar machines suitable for sliding on snow and on ice.
  • the 'in situ' injection technique is frequently used. It consists, generally initially, to have against or near the walls of the cavity of a mold, the peripheral elements of the structure, more particularly; the sliding sole, the side edges, the upper and lateral protective casing, the reinforcing elements and other elements. Then, the components thus formed are injected with the constituents of a hardenable foam such as a polyurethane or phenolic foam which expands and ensures both the plating of the peripheral elements against the walls of the mold and the assembly of a at least part of the elements between them.
  • a hardenable foam such as a polyurethane or phenolic foam
  • the document FR 2 679 780 overcomes the use of bonding films and proposes replacing the reinforcing elements by a tubular sheet in the form of a mesh network in order to delimit a closed interior compartment in which are injected the constituents of the foam.
  • the foam passes through the trunks of the tube to coat the latter, and to press the upper face and the lateral faces of a covering layer of flexible thermoplastic material against the walls of the mold.
  • a tube does not provide optimal reinforcement of the structure taking into account its own structure and its approximate placement inside the ski after injection.
  • the tube must have a thickness which adapts to the thickness distribution of the ski. A given size and thickness distribution corresponds to a particular tube reference. The reference number is multiplied and therefore the production costs are higher.
  • the mesh tube remains relatively flexible and therefore plays a minor role in maintaining the peripheral elements before foaming. It also does not participate in the formation of the covering layer which must therefore be flexible enough to be able to be deformed by the pressure of the foam.
  • Document FR-A-2 700 479 relates to an improvement which consists in adding an additional reinforcement in dry fabric reinforced with metallic weft threads in order to obtain a remanent curvature in the shape of an inverted U in the area of the pad only.
  • Japanese document (B2) n ° 63-63233 relates to a method of manufacturing skis by injecting synthetic foam inside a structure using openwork reinforcements based on fibers and resin arranged on the surface of the sole and on the underside of the upper decoration layer.
  • the upper reinforcement is supported by several sections of corrugated plates of elastic material spaced longitudinally over the entire length of the ski.
  • the process applies to the manufacture of 'sandwich' skis; that is to say comprising a stack of flat plates of different elements comprising the sole, the lower reinforcement, the core, the upper reinforcement and the decoration top.
  • the foam is only used for bonding the different elements because it can penetrate through the mesh of the reinforcements.
  • Document DE-A1-43 19 245 relates to a process for manufacturing a ski by injecting a foam.
  • the upper reinforcement may be a perforated steel plate held in position across its width by several spacer pieces. These parts, however, have the sole function of keeping the perforated plate in contact with the lower surface of the outer layer of the ski without providing determined space for sufficient passage of the foam to ensure perfect adhesion and good forming the outer layer.
  • the outer layer is in a flat configuration and held in a sliding air gap of the mold. It is the pressure of the foam which deforms the outer layer and forms it against the walls of the mold. The positioning of the reinforcing plate during injection is therefore done in a fairly random manner since it is simply kept under pressure by the spacer pieces against the external layer which is deformed.
  • the object of the present invention is to provide an improvement to the existing injection methods for producing a ski in good shape and economically.
  • One of the objects is therefore to carry out the assembly, the bonding of the elements and the forming of the outer covering sheet by the foam injected 'in situ' during a single main injection cycle.
  • Another object of the invention is the possibility of dispensing with any additional bonding interface.
  • Another object of the invention is to be able to vary the mechanical characteristics of the ski easily in a modular manner as required and economically.
  • Another object of the invention is to keep a wide choice of materials used to form the reinforcing elements, compatible with bonding with the foam.
  • Another object of the invention is to ensure excellent positioning of the reinforcing elements during injection in order to ensure reproducible and controlled mechanical characteristics.
  • Another object of the invention is to facilitate the implementation of the elements by the manipulator thereby saving time and productivity.
  • the foam is used both for forming the structure, and in particular for the covering sheet and for bonding the essential elements of the structure to one another.
  • the lateral spacing of small width reinforcements allows the foam to circulate more freely and promotes the cohesion of the entire structure.
  • the bracing pieces locally support the covering sheet; and hold local reinforcement elements in place at a predetermined distance from the lower surface of said cover sheet to promote the passage of the foam between the reinforcement elements and said cover sheet.
  • the formation and cohesion of the structure is even more improved.
  • the foam completely traps the local reinforcing elements, which prevents any risk of delamination.
  • the bracing pieces are obtained from one or more plastic or metallic profiles produced by injection, by extrusion or pultrusion, then cut into sections of length. determined. Thus, these parts can therefore be obtained very economically.
  • each spacer piece is presented as a flattened tube section, the wall of which comprises, at least, a series of open housings, of concave cross section, and which extend substantially in the direction longitudinal of the molded structure, into which the local reinforcing elements are inserted.
  • the prepositioning of the reinforcements is facilitated without any particular adjustment on the part of the manipulator. It also ensures the predetermined distance required between the reinforcing elements and the cover sheet.
  • the reinforcements are always inside the structure in the same configuration; which guarantees good reproducibility of the mechanical characteristics from one ski to another.
  • each housing includes a narrowing zone to allow engagement by clipping of each local reinforcement element.
  • the fixing of each reinforcement is done quickly, simply and without gluing.
  • the reinforcements can thus be slightly bent and prestressed to adapt to the particular geometry of the structure, while remaining firmly retained in their housing. Time is also saved in the prepositioning operation.
  • each bracing piece is presented as a profile section having a series of holes which extend substantially in the longitudinal direction of the molded structure, and whose cross section is slightly greater than the cross section of each local reinforcement element. Pre-positioning is very fast in this case too. The reinforcement elements can be held in place without bonding.
  • the bracing pieces are made of a deformable semi-rigid material to adapt to the variation in thickness of the cross section as a function of the length of the molded structure.
  • the number of part references used along the molded structure is advantageously limited since a single reference can adapt to the thickness profile of the molded structure, within a certain given thickness range.
  • the bracing pieces are made of a rigid material resistant to crushing.
  • the spacer part participates in the preforming of the cover sheet when the mold is closed.
  • the local reinforcing elements are rods with a circular, oval or polygonal full section.
  • the rods are more economical.
  • their use makes it possible to more easily modulate the mechanical characteristics of bending and torsion of the beam.
  • a flat sole (3) is deposited flat and at the bottom of a lower part (1), for example made of polyethylene, two lateral edges (4) which border on each side the gliding sole.
  • the sole is then covered by a first lower reinforcing element, such as a metal plate (5).
  • the plate extends longitudinally continuously over a large part of the length of the structure to be produced. It advantageously comprises pins (50) regularly distributed over its lower surface which allow the plate to be placed on the sole while leaving a space between the sole and the lower surface of the plate. At the location of the pins, the upper surface of the plate also includes recesses made by punching, for example.
  • Several local spacer pieces (6) are then placed on the plate (5); separated longitudinally from each other over the entire length of the structure to be produced.
  • each piece (6) is in the form of a section of hollow tube, the lower part of which comprises pins (60) of shape complementary to that of the hollows (51) of the plate (5), to allow easy prepositioning of local parts relative to the plate (5).
  • the wall In the upper part of the tube, the wall comprises a series of laterally spaced apart openings (62) which have a concave cross section. These upper open openings (62) extend over the entire length of each part in the longitudinal direction of the molded structure.
  • each rod is preferably inserted, a rod with a full section.
  • the rods are made of material chosen from the group consisting of a metal of the steel, aluminum or aluminum alloy type, a reinforced plastic material.
  • each rod has a section of substantially circular shape, but one can imagine other sections of oval or polygonal shape, for example.
  • each local reinforcing element (7) in its respective housing To facilitate the maintenance in position of each local reinforcing element (7) in its respective housing; it is expected that the cross section of each housing includes a narrowing zone of width slightly less than the diameter of the reinforcing element.
  • the engagement is therefore done by elastic clipping by simple manual pressure.
  • a plastic covering sheet (8) monolayer or multilayer.
  • a plastic covering sheet is generally chosen from flexible or semi-rigid thermoplastic materials at room temperature. This sheet is lightly tiled by hand and then prepositioned so that its lateral ends can take position in longitudinal grooves (10) of the lower part of the mold. Compressible silicone seals (11) are provided to improve the seal after closing the mold. Then, the upper part (2) of the mold is lowered to form a sealed closed enclosure by compression of the seals (11). When closing the mold, the lateral edges of the cover sheet (8) are pinched firmly in the air gap formed in the vicinity of the joint plane of the mold (100); without possibility of sliding the sheet ( Figure 3).
  • the part of the sheet located inside the mold to have a developed surface equivalent to the surface of the imprint of the corresponding part of the mold; in this case the imprint of the upper part (2), in the illustrated case.
  • This avoids any defect of off-center of the cover sheet (8) relative to the rest of the structure, which can constitute a major cause of scrap when the sheet is predecorated before being molded, for example.
  • the spacer pieces (6) can be slightly deformed by crushing and they thus adapt to the variation in thickness of the cross section as a function of the length of the molded structure. It is thus possible to use only a limited series of parts of different thickness by providing to produce each part in a semi-rigid deformable material of plastic or metal produced by injection or by extrusion, for example.
  • the spacer piece locally supports the covering sheet by bosses (63) for example, and thus keeps in place the local reinforcing elements (7) at a predetermined distance from the lower surface of the covering sheet (8).
  • the next step illustrated in FIG. 4 consists in injecting into the closed volume, the constituents of a foam (9), of the polyurethane type for example, namely an isocyanate constituent and a polyol constituent which react 'in situ' causing a heat release and foam expansion. Sufficient injection of the components is provided so that the foam (9) can completely fill the defined volume.
  • a foam (9) of the polyurethane type for example, namely an isocyanate constituent and a polyol constituent which react 'in situ' causing a heat release and foam expansion.
  • the foam thus fills the space between the lower plate (5) and the gliding sole (3) and the space provided between each local reinforcement element or rod (7) and the covering sheet (8).
  • a homogeneous structure with strong cohesion is obtained in which the elements serving to reinforce the structure are trapped in the foam, after it has hardened.
  • the foam also repels and presses the cover sheet evenly against the walls of the upper part of the hill.
  • the sheet thus takes its final shape in the mold.
  • the forming of the sheet can be promoted by heating the mold to a temperature and for a sufficient time, depending on the nature of the material used.
  • the material constituting the layer (s) of the covering sheet is chosen from the group of aliphatic polyamides, polyether amide block, polyether ester block, polycarbonates, ABS (Acrylonitrile Butadiene Styrene), AS (Acrylonitrile Styrene) pure or mixed with TPU (thermoplastic urethane elastomer), polyethylene terephthalates (PET), polybutadienes terephthalates (PBT), polyurethanes, polyolefins, as well as mixtures and copolymers of some of these constituents.
  • ABS Acrylonitrile Butadiene Styrene
  • AS Acrylonitrile Styrene
  • TPU thermoplastic urethane elastomer
  • PET polyethylene terephthalates
  • PBT polybutadienes terephthalates
  • polyurethanes polyolefins, as well as mixtures and copolymers of some of these constituents.
  • the local reinforcing elements or rods are made of material chosen from the group consisting of: a metal of the steel, aluminum or aluminum alloy type, a reinforced plastic material. In the latter case, when being molded, the rods are based on glass fibers, carbon or aramid and on a matrix of thermosetting or thermoplastic resin.
  • FIG. 5 illustrates, in cross section, the structure after injection of the foam and molding between two local bracing pieces. Thanks to the spacer pieces, a predetermined gap (d) is ensured between each local reinforcing element (7) and the covering sheet (8).
  • Figure 6 shows the longitudinal arrangement of the local reinforcing elements (7) and the regular distribution of the bracing pieces (6) along the molded structure.
  • the structure has the shape of a ski which schematically has a wasp-shaped shape.
  • the width of each piece (6) can be variable to adapt to the particular variation in width of the ski.
  • the local reinforcing elements (7) extend longitudinally forming a bundle with high flexural and torsional reinforcement characteristics. These characteristics can be easily modulated longitudinally and laterally by modifying the number and / or the length of the elements (7).
  • One can, for example, increase the mechanical characteristics of the ski in the central area by adding several additional elements (7) of limited length in the area to be reinforced.
  • the molded structure can be entirely reinforced by local elements or upper rods (70) and lower (71) as shown in FIG. 7.
  • the bracing piece (6) comprises both a series of upper housings (620) and a series of lower housings (621). By bosses (631) the bracing piece keeps the lower rods (71) in place at a certain distance from the sliding sole (3) so as to allow the foam to circulate freely for perfect cohesion of the structure.
  • reliefs (80) or recesses (81) can easily be obtained on the surface of the covering sheet (8). These shapes are produced by the deformation of the sheet (8) in contact with corresponding recesses or reliefs in the mold cavity and under the pressure exerted by the expansion of the foam during the injection step.
  • the bracing piece (6) comprises upper housings (62) which are open towards the inside of the structure.
  • the elastic compressibility of the part is increased by lugs (64) which act as springs inside the structure.
  • the lower reinforcement element (50) is held in contact with the sole (3) by the tabs (64).
  • It can be a plate made of fibrous material pre-impregnated with an epoxy resin, for example. With heat, during injection molding, we obtain crosslinking of the resin and simultaneously bonding of the plate to the sole and with the foam.
  • the bracing piece (6) can also be presented as a profile section having a series of holes (65) which extend substantially in the direction of the molded structure, and the cross section of which transverse is slightly greater than the cross section of each upper reinforcing element (7).
  • the upper elements (7) are pre-positioned by simple sliding in their corresponding adapted section hole.
  • molded structure is not limited to the examples described and one can imagine other structures without departing from the scope of the present invention.
  • FIG. 10 thus illustrates another variant in which the lateral reinforcement can be increased by an edge element (82) positioned on each lateral edge (4) and extending over a large part of it.
  • the cover sheet forms only part of the edge of the molded structure, the lateral edges of which rest on each edge element (82).
  • the forming of the cover sheet is carried out by the foam itself. It may be otherwise in the case where, for example, the material used for the sheet is not easily deformable or when the final shape to be produced is relatively complex. In this case, it may be necessary to apply a step of 'preforming the upper cover sheet, prior to the step of molding.

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  • Injection Moulding Of Plastics Or The Like (AREA)
EP96102251A 1995-03-03 1996-02-15 Verfahren zur Herstellung einer Spritzgussstruktur Withdrawn EP0729769A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9502855 1995-03-03
FR9502855A FR2731160B1 (fr) 1995-03-03 1995-03-03 Procede de fabrication d'une structure moulee, notamment de ski ou de surf des neiges, par injection d'une mousse a expansion "in situ"

Publications (1)

Publication Number Publication Date
EP0729769A1 true EP0729769A1 (de) 1996-09-04

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EP96102251A Withdrawn EP0729769A1 (de) 1995-03-03 1996-02-15 Verfahren zur Herstellung einer Spritzgussstruktur

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EP (1) EP0729769A1 (de)
FR (1) FR2731160B1 (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2773999A1 (fr) * 1998-01-28 1999-07-30 Rossignol Sa Procede de fabrication par injection d'une planche de glisse
WO2004045727A1 (de) * 2002-11-19 2004-06-03 Sportstec Gesellschaft Zur Entwicklung Innovativertechnologien Uwe Emig, Prof. Reinhold Geilsdörfer, Markus Gramlich Gbr Alpinski
EP1736293A1 (de) * 2005-06-23 2006-12-27 Proseat Verfahren zur Herstellung eines Bauteils mit einem Element auf Isocyanatbasis, das mit einem thermoplastischen Element gebunden ist und dadurch hergestelltes Bauteil
AT501312B1 (de) * 2005-02-04 2009-05-15 Hexcel Holding Gmbh Verfahren zur herstellung eines gleitgeräts und gleitgerät
DE102009022506A1 (de) * 2009-05-25 2010-12-09 Scharr, Gerhard, Prof. Dr.-Ing. Leichtbau-Ski
EP3632513A1 (de) * 2018-10-05 2020-04-08 Skis Rossignol Gleitbrett mit eingespritzem kern, das mit längsverstärkungselementen ausgestattet ist
WO2022034099A1 (fr) * 2020-08-12 2022-02-17 Hutchinson Procede de fabrication d'une piece mecanique, la piece obtenue et un triangle de suspension

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2405075A1 (fr) * 1977-10-07 1979-05-04 Karhu Titan Oy Ski a noyau en mousse de plastique, et procede et outil pour sa fabrication
FR2684012A1 (fr) * 1991-11-22 1993-05-28 Rossignol Sa Ski en forme, de section non rectangulaire.
WO1994028984A1 (de) * 1993-06-09 1994-12-22 Kästle Aktiengesellschaft Ski

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2405075A1 (fr) * 1977-10-07 1979-05-04 Karhu Titan Oy Ski a noyau en mousse de plastique, et procede et outil pour sa fabrication
FR2684012A1 (fr) * 1991-11-22 1993-05-28 Rossignol Sa Ski en forme, de section non rectangulaire.
WO1994028984A1 (de) * 1993-06-09 1994-12-22 Kästle Aktiengesellschaft Ski

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2773999A1 (fr) * 1998-01-28 1999-07-30 Rossignol Sa Procede de fabrication par injection d'une planche de glisse
WO2004045727A1 (de) * 2002-11-19 2004-06-03 Sportstec Gesellschaft Zur Entwicklung Innovativertechnologien Uwe Emig, Prof. Reinhold Geilsdörfer, Markus Gramlich Gbr Alpinski
US7185908B2 (en) 2002-11-19 2007-03-06 Sportstec Gesellschaft Zur Entwicklung Innovativer Technologien Uwe Emig, Prof. Reinhold Geilsdorfer, Markus Gramlich Gbr Downhill ski
AT501312B1 (de) * 2005-02-04 2009-05-15 Hexcel Holding Gmbh Verfahren zur herstellung eines gleitgeräts und gleitgerät
EP1736293A1 (de) * 2005-06-23 2006-12-27 Proseat Verfahren zur Herstellung eines Bauteils mit einem Element auf Isocyanatbasis, das mit einem thermoplastischen Element gebunden ist und dadurch hergestelltes Bauteil
DE102009022506A1 (de) * 2009-05-25 2010-12-09 Scharr, Gerhard, Prof. Dr.-Ing. Leichtbau-Ski
EP3632513A1 (de) * 2018-10-05 2020-04-08 Skis Rossignol Gleitbrett mit eingespritzem kern, das mit längsverstärkungselementen ausgestattet ist
FR3086868A1 (fr) * 2018-10-05 2020-04-10 Skis Rossignol Ski injecte noyau hybride
WO2022034099A1 (fr) * 2020-08-12 2022-02-17 Hutchinson Procede de fabrication d'une piece mecanique, la piece obtenue et un triangle de suspension
FR3113380A1 (fr) * 2020-08-12 2022-02-18 Conseil Et Technique Procédé de fabrication d’une pièce mécanique, la pièce obtenue et un triangle de suspension.

Also Published As

Publication number Publication date
FR2731160B1 (fr) 1997-05-16
FR2731160A1 (fr) 1996-09-06

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