EP3885009B1 - Sliding board body with wooden core and pu foam connecting layers below and/or above the core - Google Patents
Sliding board body with wooden core and pu foam connecting layers below and/or above the core Download PDFInfo
- Publication number
- EP3885009B1 EP3885009B1 EP20165635.2A EP20165635A EP3885009B1 EP 3885009 B1 EP3885009 B1 EP 3885009B1 EP 20165635 A EP20165635 A EP 20165635A EP 3885009 B1 EP3885009 B1 EP 3885009B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- board body
- sliding board
- wood core
- reinforcement
- layer
- 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.)
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Links
- 239000006260 foam Substances 0.000 title description 12
- 239000002023 wood Substances 0.000 claims description 82
- 239000000463 material Substances 0.000 claims description 24
- 229920005830 Polyurethane Foam Polymers 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 15
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- 230000002787 reinforcement Effects 0.000 claims 29
- 239000011162 core material Substances 0.000 description 82
- 239000004814 polyurethane Substances 0.000 description 22
- 229920002635 polyurethane Polymers 0.000 description 20
- 238000010276 construction Methods 0.000 description 11
- 229920005989 resin Polymers 0.000 description 8
- 239000011347 resin Substances 0.000 description 8
- 230000008901 benefit Effects 0.000 description 4
- XECAHXYUAAWDEL-UHFFFAOYSA-N acrylonitrile butadiene styrene Chemical compound C=CC=C.C=CC#N.C=CC1=CC=CC=C1 XECAHXYUAAWDEL-UHFFFAOYSA-N 0.000 description 2
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 2
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 101150049278 US20 gene Proteins 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 150000002513 isocyanates Chemical class 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000008259 solid foam Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
Images
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
- A63C5/126—Structure of the core
-
- 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 present invention relates to a gliding board body, in particular a ski or snowboard body, and a method for producing such a gliding board body.
- gliding board bodies are also known in which the core consists of a synthetic material, for example polyurethane (PU) foam.
- PU polyurethane
- the core consists of both PU foam and a wooden core. The production of such a gliding board body with a PU foam core is significantly cheaper than using a wooden core.
- the present invention is directed, inter alia, to a gliding board body with a longitudinal axis, which has a wooden core with an upper side, an underside and at least two side surfaces. Furthermore, the gliding board body has at least two side walls connected to the respective side surfaces of the wood core. Above the top of the wood core is a top chord with one or more top chord layers and a top layer, which can also serve as a design support. Below the underside of the wood core is a bottom chord with one or more bottom chord layers and a tread with side edges.
- a first tie layer is provided which is (i) between the top side of the wood core and the top chord and/or (ii) between the top chord and the cover layer and/or (iii) between a first top chord layer and a second top chord layer (of the several top chord layers) and the respective adjoining layers are glued together.
- a second connection layer is provided, which is arranged (i) between the underside of the wood core and the lower belt and/or between the lower belt and the tread and/or (iii) between a first lower belt layer and a second lower belt layer (of the several lower belt layers) and the adjacent layers are glued together.
- the first and/or the second connecting layer has a polyurethane (PU) foam.
- the invention is based, among other things, on the idea of combining two fundamentally different technologies with one another in order to thus benefit from the advantages of both technologies.
- the gliding board body according to the invention thus has the mechanical advantages and the value of a gliding board body with a classic wooden core in a sandwich construction.
- the gliding board body according to the invention can be produced more simply and cost-effectively, since machines that are already known for producing gliding board bodies with a PU core or PU-coated wooden core can be used for this purpose.
- the present invention is based on producing a sandwich ski using the PU process.
- the first and/or the second connecting layer has a PU foam and not PU resin as an adhesive (usually an epoxy resin is used for this purpose), as has already been practiced in isolated cases in the prior art Sandwich construction is used. It is a solid foam with gas bubbles separated by solid PU walls. Such a foam has a density of less than 1 g/cm 3 , preferably less than 0.9 g/cm 3 and particularly preferably less than 0.8 g/cm 3 .
- Such a PU foam can be easily injected with the known PU process into the corresponding gaps between the layers adjoining the connecting layer and also completely fills irregularly shaped gaps, so that a dimensionally stable connection is generated between the individual layers of the gliding board body. Due to the low density of the PU foam, the weight of the gliding board body is not unnecessarily increased.
- the first connecting layer extends continuously in a cross section perpendicular to the longitudinal axis of the gliding board body from one side panel to the opposite side wall and/or from an outer side edge of the gliding board body to the opposite outer side edge of the gliding board body.
- the second connecting layer also extends in a cross section perpendicular to the longitudinal axis of the gliding board body continuously from one side wall to the opposite side wall and/or from one side edge of the running surface to the opposite side edge of the running surface and/or from one side edge of the gliding board body to the opposite side edge of the gliding board body.
- the wood core is connected directly to the side walls on both of its side surfaces, for example glued.
- the side panels can be made of different materials such as acrylonitrile butadiene styrene copolymers (ABS) or phenol.
- a connecting layer is arranged between layers A and B does not rule out the connecting layer coming into contact with further layers and adhering these further layers to one another or to one of layers A and B.
- the first connecting layer between the top of the wood core and the top chord can connect the top chord both to the top of the wood core and to the tops of the side walls.
- the first connection layer can be in contact both with the first upper belt layer and with the second upper belt layer.
- the second connecting layer between the underside of the wood core and the underbelt can also be in contact with part of the tread and/or its side edges and/or with the undersides of the sidewalls.
- the second connection layer can also be in contact with part of the tread and/or its side edges and/or with the undersides of the sidewalls.
- the maximum thickness of the first and/or second connecting layer is less than the maximum thickness of the wood core, particularly preferably less than the minimum thickness of the wood core.
- the mechanical properties should primarily be dominated by the wood core, at least along the first longitudinal section of the gliding board body. It's in this
- connection further preferred that at least along a second longitudinal section of the gliding board body for each cross section perpendicular to the longitudinal axis of the gliding board body, the average thickness of the first and / or second connecting layer is smaller than the average thickness of the wood core.
- the thickness of the PU foam layer is as thin as possible. However, a certain minimum thickness is required in order to be able to introduce the foam-forming PU material into the appropriate spaces.
- the average thickness of the first and/or second connecting layer is less than 4 mm, more preferably less than 3 mm and particularly preferably less than 2 mm for each cross section perpendicular to the longitudinal axis of the gliding board body.
- the ratio of the cross-sectional area of the wood core to the total cross-sectional area of the first and second connecting layer is at least 1.0, preferably at least 1.5 and particularly preferably at least 2. is 0.
- the first to fourth longitudinal sections are not mutually adjoining sections, but the various longitudinal sections overlap with one another and can also be partially identical.
- the first longitudinal section preferably extends at least 60%, more preferably at least 70% and most preferably at least 80% of the length of the planing board body (measured from the blade tip to the rear end of the rear end turn).
- the first longitudinal section preferably extends over at least 80%, more preferably at least 90% and particularly preferably at least 95% of the length of the wood core.
- the second longitudinal section preferably extends over at least 60%, more preferably at least 70% and particularly preferably at least 80% of the length of the gliding board body.
- the second longitudinal section preferably extends over at least 80%, more preferably at least 90% and particularly preferably at least 95% of the length of the wood core.
- the third longitudinal section preferably extends over at least 60%, more preferably at least 70% and particularly preferably at least 80% of the length of the gliding board body.
- the third longitudinal section preferably extends over at least 80%, more preferably at least 90% and particularly preferably at least 95% of the length of the wood core.
- the fourth longitudinal section preferably extends over at least 60%, more preferably at least 70% and particularly preferably at least 80% of the length of the gliding board body.
- the fourth longitudinal section preferably extends over at least 80%, more preferably at least 90% and particularly preferably at least 95% of the length of the wood core.
- the wood core preferably extends over at most 95%, more preferably at most 90% and particularly preferably at most 85% of the length of the gliding board body and/or over at least 50%, preferably at least 60% and particularly preferably at least 70% of the length of the gliding board body.
- the present invention is also aimed at a method for producing a gliding board body, in particular a gliding board body as described above.
- an upper cover layer, an upper belt with one or more upper belt layers, a tread, a lower belt with one or more lower belt layers and a wood core with an upper side, an underside and at least two side surfaces and at least two side walls connected to the respective side surfaces of the wood core are introduced a form such that (i) between the top chord and the top side of the wood core and/or (ii) between the top chord and the cover layer and/or (iii) between a first top chord layer and a second top chord layer there is a first intermediate space and that ( i) there is a second gap between the tread and the underside of the wood core and/or (ii) between the underside of the wood core and the base ply and/or (iii) between a first base ply and a second base ply.
- a PU material is then injected into the first and second spaces to form a PU foam in the first and second spaces in order to bond the layers adjoining the spaces to one another.
- the first intermediate space and the second intermediate space are preferably completely filled with PU foam.
- the first intermediate space also extends between the upper flange and the top side of the respective side panel and/or the second intermediate space also extends between the lower flange and the bottom side of the respective side panel.
- the side walls are connected, for example glued, to the wood core before being introduced into the mold.
- the PU material is preferably injected in such a way that the first material front in the first intermediate space moves forward during the injection process at approximately the same speed as the second material front in the second intermediate space. This prevents the geometric arrangement of the individual components within the mold from being jeopardized by a corresponding expansion of the PU foam due to the hasty advance of a material front. It is preferred that the distance in the longitudinal direction of the gliding board body between the first material front and the second material front during the injection process is always less than 10 cm, preferably less than 7 cm and particularly preferably less than 5 cm.
- the PU material is preferably injected into the interstices from a longitudinal end of the mold.
- the thickness of the wood core tapers at the front and/or rear end of the wood core.
- the gliding board body according to the invention can also be used as preferred features within the scope of the manufacturing process and vice versa.
- the first and second spaces are designed in such a way that the preferred dimensions of the sliding board body according to the invention can be achieved.
- the average thickness of the first and/or second gap is less than 4 mm, preferably less than 3 mm and particularly preferably less than 2 mm.
- figure 1 shows a cross section through a gliding board body according to a preferred embodiment of the present invention.
- An alternative according to a further preferred embodiment is in figure 2 to see.
- the longitudinal axis of the gliding board body shown extends perpendicularly to the plane of the drawing.
- the gliding board body has a wooden core 1 with a top 1a, a bottom 1b and two side surfaces 1c. Respective side walls 2 of the gliding board body are connected to the two side surfaces 1c of the wooden core.
- the side panels 2 are usually glued to the two side surfaces 1c of the wood core 1 .
- other connection methods are also conceivable.
- the gliding board body also has a top chord 3 with a first top chord layer 3a and a second top chord layer 3b and a cover layer 3c, which can also serve as a design support, among other things.
- the first and second upper belt layer can have a different extent in the transverse direction, as shown in figure 1 can be seen, but can also have identical dimensions (cf. e.g figure 6 ).
- the gliding board body also has a bottom chord 5 with a first bottom chord layer 5a and a second bottom chord layer 5b and a running surface 6 with respective side edges 6a.
- the first and second bottom chord layer can have an identical extent in the transverse direction, as shown in figure 1 can be seen, but can also have different dimensions (cf. e.g figure 7 ).
- the top chord 3 (strictly speaking, the complete first top chord layer 3a and part of the second top chord layer 3b) is glued to the top 1a of the wood core 1 and the two side walls 2 by means of a first connecting layer 7.
- the lower chord 5 (or the first lower chord layer 5a) is glued to the underside 1b of the wood core 1 and the two side walls 2 by means of a second connecting layer 8.
- the first connecting layer 7 or the second connecting layer 8 or both connecting layers 7 and 8 should have a PU foam.
- the second connecting layer 8 also glues the underside 1b of the wood core 1 and the two side walls 2 to a part of the tread 6 and its side edges 6a.
- the first or second connection layer is used to connect the upper or lower chord to the wood core and optionally the side walls.
- the PU foam according to the invention replaces the resin connection customary in sandwich constructions.
- the manufacturing process becomes simpler and, accordingly, more cost-effective.
- PU foam - in contrast to the resins commonly used - is extremely well suited to compensating for corresponding variabilities in the distance between the wood core on the one hand and the upper and lower flanges on the other.
- the thickness of the first connecting layer 7 varies quite significantly, among other things, because the upper belt 3 (together with the cover layer 4) has a concave section 20, which in the present case is approximately V-shaped. This specific shape of the upper belt 3, the thickness of the first Connection layer 7 in the edge areas may be many times larger than in the central area of the cross section.
- FIG 4 an embodiment can be seen in which the wood core 1 has a regular pattern of projections 8 and depressions 9 .
- These projections 8 and depressions 9 are provided both on the upper side 1a and the lower side 1b of the wood core 1 in the illustrated embodiment. However, they could also be provided on only one of the two sides.
- the use of a conventional resin compound is problematic.
- the PU foam used within the scope of the present invention easily fills the corresponding depressions 9 in the wooden core 1 and thus ensures a consistently stable connection between the wooden core 1 and the upper chord 3 or the lower chord 5 as well as a corresponding mechanical stability of the gliding board body.
- first and/or second connecting layer extends continuously from one side panel 2 to the opposite side panel 2 in a cross section perpendicular to the longitudinal axis of the gliding board body.
- first and/or second connecting layer can be used to compensate for variabilities in the distance between the wood core and the upper chord or lower chord by means of a thick profile
- first and/or second connecting layer PU foam forms a thin layer of adhesive and does not dominate the mechanical properties, as is the case with conventional PU gliding board bodies.
- the maximum thickness of the first and/or second connecting layer is smaller than the maximum thickness of the wood core, preferably smaller than the minimum thickness of the wood core.
- the corresponding Thicknesses are merely exemplary in a cross-section perpendicular to the longitudinal axis of the gliding board body according to FIG figure 3 registered.
- the maximum thickness D7 max of the first connecting layer 7 and the maximum thickness D8 max of the second connecting layer 8 are each smaller than the maximum thickness D1 max of the wood core 1 and the minimum thickness D1 min of the wood core 1.
- this relation should not only be according to an illustrated cross section figure 3 apply, but for each cross-section perpendicular to the longitudinal axis of the gliding board body along a certain longitudinal section of the gliding board body, which can extend, for example, over at least 60% of the length of the gliding board body.
- the ratio of the cross-sectional area of the wood core to the total cross-sectional area of the first and second connecting layer is at least 1.0, preferably at least 1.5 and particularly preferably at least 2. is 0.
- FIG. 5 shows a longitudinal section through a mold for producing a sliding board body according to the invention.
- the mold 10 shown essentially consists of an upper mold half 14 and a lower mold half 15, into which the upper and lower flanges (including the cover layer and tread), the wood core 1 and the side walls connected to the respective side surfaces of the wood core 1 are introduced.
- the course of the mold halves 14 and 15 reflects the three main components of a gliding board body, namely the middle part 11, the blade tip 12 and the rear end 13 Should form 11 of the sliding board body are each enlarged longitudinal sectional drawings in the Figures 5a to 5c pictured.
- the wood core 1 has a substantially constant thickness (or a thickness that varies only very slightly) in the illustrated embodiment, so that a space with a substantially constant thickness is formed above and below the wood core 1, which in the will be filled with PU foam during the procedure.
- the cross-section through the sliding board body according to the invention can be at any point of the in Figure 5c shown portion of the central part to be substantially identical and one of the cross sections according to the Figures 1 to 4 correspond.
- the wood core 1 tapers towards the tip of the blade or the rear end (cf. Figures 5a and 5b ), so that the cross-sections in these edge sections of the central part can vary significantly under certain circumstances.
- the mold 10 formed by the two mold halves 14 and 15 is closed in the region of the rear end—apart from an outlet (not shown) for the air displaced by the foam (cf. Figure 5b ), whereas in the area of the blade head (cf. Figure 5a ) an inlet 17 for injecting a PU material through the gap 16 into the first gap 18 and the second gap 19 is provided on the top and bottom of the wood core 1, respectively.
- a PU foam is formed from the PU material in the first space 18 and in the second space 19, so that the upper chord of the gliding board body according to the invention is connected to the upper side of the wooden core 1 and the lower chord of the Gliding board body according to the invention is glued to the underside of the wood core 1.
- An advantage of the method according to the invention is that it can be carried out using conventional PU foaming systems.
- a PU high-pressure reaction molding machine HK for processing rigid integral skin foam from the manufacturer Hennecke was used.
- this machine allows the production of all types of rigid foams and especially integral foams.
- the integral foam system consisting of Modipur ® US452 black and isocyanate US20 available from Hexcel was used as the PU material. This is a propellant-free system for foams with a high modulus of elasticity.
- the two components of this integral foam system were mixed in the mixing head at a processing temperature of 28 to 32 °C and the mixture was injected through the injection opening 17 on the blade head (cf.
- Figure 5a of the mold 10 at a pressure of 140 to 145 bar into the first and second cavities.
- the mold was heated to a temperature of 50 to 54 °C. After a setting time of approx. 40 to 45 s, the mold halves were separated from one another and the gliding board body was removed from the mould. The entire foam cycle took about 5 to 8 minutes.
- the viscosity of the mixture during injection is as low as possible to ensure that the PU material can easily penetrate small gaps.
- the viscosity at 25°C is less than 1000 mPas, more preferably less than 800 mPas and most preferably less than 700 mPas.
- first connecting layer is provided between the top side of the wood core and the top chord and a second connecting layer is provided between the bottom side of the wood core and the bottom chord.
- a first connecting layer can also be arranged between the upper belt and the cover layer and/or between a first upper belt layer and a second upper belt layer and a second Connection layer can be arranged between the bottom belt and the tread and/or between a first bottom belt layer and a second bottom belt layer.
- the first connecting layer 7 is arranged between the upper belt 3 (or the second upper belt layer 3b) and the cover layer 4 and the second connecting layer 8 is arranged between the lower belt 5 (or the second lower belt layer 5b) and the tread 6.
- the two upper chord layers 3a and 3b and the two lower chord layers 5a and 5b each have identical dimensions, but this is not necessary. However, it is preferred that at least one of the two upper belt layers extends on both sides to the lateral edge of the gliding board body, as is shown in figure 6 you can see.
- the individual top and bottom belt layers can be connected to one another, for example via a resin layer.
- the upper and lower belt layers are separated from each other and connected to each other via the two connecting layers. Accordingly, the first connecting layer 7 is arranged between the first upper belt layer 3a and the second upper belt layer 3b and the second connecting layer 8 is arranged between the first lower belt layer 5a and the second lower belt layer 5b.
- the upper and lower belt layers can have different dimensions than the lower belt layers 5a and 5b or can extend the same distance in the transverse direction as the upper belt layers 3a and 3b.
- top and bottom belt layers do not have to be treated analogously with regard to their arrangement, as is the case in figures 6 and 7 is shown. Rather, the arrangement of the upper chord layers figure 6 with the arrangement of the lower chord layers figure 7 be combined, etc.
Description
Die vorliegende Erfindung betrifft einen Gleitbrettkörper, insbesondere einen Ski- oder Snowboardkörper, sowie ein Verfahren zur Herstellung eines solchen Gleitbrettkörpers.The present invention relates to a gliding board body, in particular a ski or snowboard body, and a method for producing such a gliding board body.
Aus dem Stand der Technik sind verschiedene Konstruktionen für Gleitbrettkörper bekannt. Typischerweise befindet sich ein Kern zwischen einem Obergurt und einem Untergurt, wobei die einzelnen Lagen der Konstruktion mittels eines Harzes miteinander verklebt bzw. verpresst sind. Traditionell wurde Holz als Kernmaterial eingesetzt, man spricht auch von einer sogenannten "Sandwich-Konstruktion". Es sind aber auch Gleitbrettkörper bekannt, bei denen der Kern aus einem Synthetikmaterial, bspw. Polyurethan(PU)-Schaum, besteht. So bechreibt bspw. die
Es ist eine Aufgabe der vorliegenden Erfindung, einen verbesserten Gleitbrettkörper sowie ein verbessertes Herstellungsverfahren für Gleitbrettkörper bereitzustellen. Diese Aufgabe wird durch einen Gleitbrettkörper gemäß Anspruch 1 sowie durch ein Verfahren zur Herstellung eines Gleitbrettkörpers gemäß Anspruch 8 gelöst.It is an object of the present invention to provide an improved gliding board body and an improved manufacturing method for gliding board bodies. This object is achieved by a gliding board body according to claim 1 and by a method for producing a gliding board body according to
Die vorliegende Erfindung richtet sich unter anderem auf einen Gleitbrettkörper mit einer Längsachse, welcher einen Holzkern mit einer Oberseite, einer Unterseite und mindestens zwei Seitenflächen aufweist. Ferner weist der Gleitbrettkörper mindestens zwei mit den jeweiligen Seitenflächen des Holzkerns verbundene Seitenwangen auf. Oberhalb der Oberseite des Holzkerns ist ein Obergurt mit einer oder mehreren Obergurtlagen sowie eine Deckschicht angeordnet, welche auch als Designträger dienen kann. Unterhalb der Unterseite des Holzkerns ist ein Untergurt mit einer oder mehreren Untergurtlagen sowie eine Lauffläche mit Seitenkanten angeordnet. Es ist eine erste Verbindungsschicht vorgesehen, die (i) zwischen der Oberseite des Holzkerns und dem Obergurt und/oder (ii) zwischen dem Obergurt und der Deckschicht und/oder (iii) zwischen einer ersten Obergurtlage und einer zweiten Obergurtlage (der mehreren Obergutlagen) angeordnet ist und die jeweils daran angrenzenden Lagen miteinander verklebt. Ferner ist eine zweite Verbindungsschicht vorgesehen, die (i) zwischen der Unterseite des Holzkerns und dem Untergurt und/oder zwischen dem Untergurt und der Lauffläche und/oder (iii) zwischen einer ersten Untergurtlage und einer zweiten Untergurtlage (der mehreren Untergurtlagen) angeordnet ist und die jeweils daran angrenzenden Lagen miteinander verklebt. Dabei weist die erste und/oder die zweite Verbindungsschicht einen Polyurethan(PU)-Schaum auf.The present invention is directed, inter alia, to a gliding board body with a longitudinal axis, which has a wooden core with an upper side, an underside and at least two side surfaces. Furthermore, the gliding board body has at least two side walls connected to the respective side surfaces of the wood core. Above the top of the wood core is a top chord with one or more top chord layers and a top layer, which can also serve as a design support. Below the underside of the wood core is a bottom chord with one or more bottom chord layers and a tread with side edges. A first tie layer is provided which is (i) between the top side of the wood core and the top chord and/or (ii) between the top chord and the cover layer and/or (iii) between a first top chord layer and a second top chord layer (of the several top chord layers) and the respective adjoining layers are glued together. Furthermore, a second connection layer is provided, which is arranged (i) between the underside of the wood core and the lower belt and/or between the lower belt and the tread and/or (iii) between a first lower belt layer and a second lower belt layer (of the several lower belt layers) and the adjacent layers are glued together. In this case, the first and/or the second connecting layer has a polyurethane (PU) foam.
Die Erfindung beruht dabei unter anderem auf der Idee, zwei grundsätzlich unterschiedliche Technologien miteinander zu verbinden, um so an den Vorteilen beider Technologien zu partizipieren. So hat der erfindungsgemäße Gleitbrettkörper die mechanischen Vorteile und die Wertigkeit eines Gleitbrettkörpers mit einem klassischen Holzkern in Sandwichkonstruktion. Allerdings lässt sich der erfindungsgemäße Gleitbrettkörper einfacher und kosteneffizienter herstellen, da hierzu bereits bekannte Maschinen zur Herstellung von Gleitbrettkörpern mit PU-Kern bzw. PU-ummanteltem Holzkern zur Anwendung kommen können. Mit anderen Worten beruht die vorliegende Erfindung darauf, einen Sandwich-Ski im PU-Verfahren herzustellen.The invention is based, among other things, on the idea of combining two fundamentally different technologies with one another in order to thus benefit from the advantages of both technologies. The gliding board body according to the invention thus has the mechanical advantages and the value of a gliding board body with a classic wooden core in a sandwich construction. However, the gliding board body according to the invention can be produced more simply and cost-effectively, since machines that are already known for producing gliding board bodies with a PU core or PU-coated wooden core can be used for this purpose. In other words, the present invention is based on producing a sandwich ski using the PU process.
Dabei ist zu betonen, dass die erste und/oder die zweite Verbindungsschicht einen PU-Schaum aufweist und nicht, wie dies im Stand der Technik bereits vereinzelt praktiziert wurde, PU-Harz als Klebstoff (in der Regel wird hierfür ein Epoxidharz verwendet) in einer Sandwich-Konstruktion zum Einsatz kommt. Es handelt sich dabei um einen festen Schaum mit Gasbläschen, die durch feste PU-Wände voneinander getrennt sind. Ein solcher Schaum hat eine Dichte von kleiner als 1 g/cm3, bevorzugt von kleiner als 0,9 g/cm3 und besonders bevorzugt von kleiner als 0,8 g/cm3. Ein solcher PU-Schaum lässt sich mit dem bekannten PU-Verfahren problemlos in entsprechende Zwischenräume zwischen den an die Verbindungsschicht angrenzenden Lagen einspritzen und füllt auch unregelmäßig geformte Zwischenräume vollständig aus, sodass eine formstabile Verbindung zwischen den einzelnen Lagen des Gleitbrettkörpers generiert wird. Wegen der geringen Dichte des PU-Schaums wird dabei das Gewicht des Gleitbrettkörpers nicht unnötig erhöht.It should be emphasized that the first and/or the second connecting layer has a PU foam and not PU resin as an adhesive (usually an epoxy resin is used for this purpose), as has already been practiced in isolated cases in the prior art Sandwich construction is used. It is a solid foam with gas bubbles separated by solid PU walls. Such a foam has a density of less than 1 g/cm 3 , preferably less than 0.9 g/cm 3 and particularly preferably less than 0.8 g/cm 3 . Such a PU foam can be easily injected with the known PU process into the corresponding gaps between the layers adjoining the connecting layer and also completely fills irregularly shaped gaps, so that a dimensionally stable connection is generated between the individual layers of the gliding board body. Due to the low density of the PU foam, the weight of the gliding board body is not unnecessarily increased.
Erfindungsgemäß erstreckt sich die erste Verbindungsschicht in einem Querschnitt senkrecht zur Längsachse des Gleitbrettkörpers durchgehend von einer Seitenwange zur gegenüberliegenden Seitenwange und/oder von einem äußeren Seitenrand des Gleitbrettkörpers zum gegenüberliegenden äußeren Seitenrand des Gleitbrettkörpers. Auch die zweite Verbindungsschicht erstreckt sich in einem Querschnitt senkrecht zur Längsachse des Gleitbrettkörpers durchgehend von einer Seitenwange zur gegenüberliegenden Seitenwange und/oder von einer Seitenkante der Lauffläche zur gegenüberliegenden Seitenkante der Lauffläche und/oder von einem Seitenrand des Gleitbrettkörpers zum gegenüberliegenden Seitenrand des Gleitbrettkörpers. Mit anderen Worten handelt es sich bevorzugt um eine klassische Sandwich-Konstruktion und nicht um die übliche PU-Konstruktion, bei der der Kern vollständig von PU-Schaum eingeschlossen ist. Vielmehr ist der Holzkern an seinen beiden Seitenflächen direkt mit den Seitenwangen verbunden, bspw. verklebt. Die Seitenwangen können dabei aus unterschiedlichen Materialien wie z.B. Acrylnitril-Butadien-Styrol-Copolymeren (ABS) oder Phenol bestehen.According to the invention, the first connecting layer extends continuously in a cross section perpendicular to the longitudinal axis of the gliding board body from one side panel to the opposite side wall and/or from an outer side edge of the gliding board body to the opposite outer side edge of the gliding board body. The second connecting layer also extends in a cross section perpendicular to the longitudinal axis of the gliding board body continuously from one side wall to the opposite side wall and/or from one side edge of the running surface to the opposite side edge of the running surface and/or from one side edge of the gliding board body to the opposite side edge of the gliding board body. In other words, it is preferably a classic sandwich construction and not the usual PU construction in which the core is completely enclosed by PU foam. Rather, the wood core is connected directly to the side walls on both of its side surfaces, for example glued. The side panels can be made of different materials such as acrylonitrile butadiene styrene copolymers (ABS) or phenol.
Die Formulierung, dass eine Verbindungsschicht zwischen den Lagen A und B angeordnet ist, schließt nicht aus, dass die Verbindungsschicht mit weiteren Lagen in Kontakt tritt und diese weiteren Lagen miteinander oder mit einer der Lagen A und B verklebt. Insbesondere kann beispielsweise die erste Verbindungsschicht zwischen der Oberseite des Holzkerns und dem Obergurt den Obergurt sowohl mit der Oberseite des Holzkerns als auch mit den Oberseiten der Seitenwangen verbinden. Ferner kann, je nach Ausdehnung in Querrichtung, die erste Verbindungsschicht sowohl mit der ersten Obergurtlage als auch mit der zweiten Obergurtlage in Kontakt stehen. Auf ähnliche Weise kann beispielsweise die zweite Verbindungsschicht zwischen der Unterseite des Holzkerns und dem Untergurt auch mit einem Teil der Lauffläche und/oder deren Seitenkanten und/oder mit den Unterseiten der Seitenwangen in Kontakt stehen. Auch bei den anderen Anordnungsalternativen für die zweite Verbindungsschicht sind entsprechende Varianten vorstellbar.The wording that a connecting layer is arranged between layers A and B does not rule out the connecting layer coming into contact with further layers and adhering these further layers to one another or to one of layers A and B. In particular, for example, the first connecting layer between the top of the wood core and the top chord can connect the top chord both to the top of the wood core and to the tops of the side walls. Furthermore, depending on the extent in the transverse direction, the first connection layer can be in contact both with the first upper belt layer and with the second upper belt layer. In a similar way, for example, the second connecting layer between the underside of the wood core and the underbelt can also be in contact with part of the tread and/or its side edges and/or with the undersides of the sidewalls. Corresponding variants are also conceivable for the other arrangement alternatives for the second connection layer.
Bevorzugt ist zumindest entlang eines ersten Längsabschnitts des Gleitbrettkörpers für jeden Querschnitt senkrecht zur Längsachse des Gleitbrettkörpers die maximale Dicke der ersten und/oder zweiten Verbindungschicht kleiner als die maximale Dicke des Holzkerns, besonders bevorzugt kleiner als die minimale Dicke des Holzkerns. Mit anderen Worten sollen zumindest entlang des ersten Längsabschnitts des Gleitbrettkörpers die mechanischen Eigenschaften in erster Linie durch den Holzkern dominiert werden. Es ist in diesemPreferably, at least along a first longitudinal section of the gliding board body, for each cross section perpendicular to the longitudinal axis of the gliding board body, the maximum thickness of the first and/or second connecting layer is less than the maximum thickness of the wood core, particularly preferably less than the minimum thickness of the wood core. In other words, the mechanical properties should primarily be dominated by the wood core, at least along the first longitudinal section of the gliding board body. It's in this
Zusammenhang ferner bevorzugt, dass zumindest entlang eines zweiten Längsabschnitts des Gleitbrettkörpers für jeden Querschnitt senkrecht zur Längsachse des Gleitbrettkörpers die durchschnittliche Dicke der ersten und/oder zweiten Verbindungsschicht kleiner ist als die durchschnittliche Dicke des Holzkerns.Connection further preferred that at least along a second longitudinal section of the gliding board body for each cross section perpendicular to the longitudinal axis of the gliding board body, the average thickness of the first and / or second connecting layer is smaller than the average thickness of the wood core.
Es ist grundsätzlich bevorzugt, dass die Dicke der PU-Schaumschicht möglichst dünn ist. Allerdings ist eine gewisse Mindestdicke erforderlich, um das schaumbildende PU-Material in die entsprechenden Zwischenräume einbringen zu können. Bevorzugt ist zumindest entlang eines dritten Längsabschnitts des Gleitbrettkörpers für jeden Querschnitt senkrecht zur Längsachse des Gleitbrettkörpers die durchschnittliche Dicke der ersten und/oder zweiten Verbindungsschicht kleiner als 4 mm, stärker bevorzugt kleiner als 3 mm und besonders bevorzugt kleiner als 2 mm.In principle, it is preferred that the thickness of the PU foam layer is as thin as possible. However, a certain minimum thickness is required in order to be able to introduce the foam-forming PU material into the appropriate spaces. Preferably, at least along a third longitudinal section of the gliding board body, the average thickness of the first and/or second connecting layer is less than 4 mm, more preferably less than 3 mm and particularly preferably less than 2 mm for each cross section perpendicular to the longitudinal axis of the gliding board body.
Es ist ferner bevorzugt, dass zumindest entlang eines vierten Längsabschnitts des Gleitbrettkörpers für jeden Querschnitt senkrecht zur Längsachse des Gleitbrettkörpers das Verhältnis der Querschnittsfläche des Holzkerns zur Gesamtquerschnittsfläche aus erster und zweiter Verbindungsschicht mindestens 1,0, bevorzugt mindestens 1,5 und besonders bevorzugt mindestens 2,0 beträgt.It is also preferred that at least along a fourth longitudinal section of the gliding board body for each cross section perpendicular to the longitudinal axis of the gliding board body the ratio of the cross-sectional area of the wood core to the total cross-sectional area of the first and second connecting layer is at least 1.0, preferably at least 1.5 and particularly preferably at least 2. is 0.
Bei den ersten bis vierten Längsabschnitten handelt es sich nicht um aneinander angrenzende Abschnitte, sondern die verschiedenen Längsabschnitte überlappen miteinander und können teilweise auch identisch sein.The first to fourth longitudinal sections are not mutually adjoining sections, but the various longitudinal sections overlap with one another and can also be partially identical.
Der erste Längsabschnitt erstreckt sich bevorzugt über mindestens 60 %, stärker bevorzugt mindestens 70 % und besonders bevorzugt mindestens 80 % der Länge des Gleitbrettkörpers (gemessen von der Schaufelspitze bis zum hinteren Ende der Hinterendaufbiegung). Bevorzugt erstreckt sich der erste Längsabschnitt über mindestens 80 %, stärker bevorzugt mindestens 90 % und besonders bevorzugt mindestens 95 % der Länge des Holzkerns.The first longitudinal section preferably extends at least 60%, more preferably at least 70% and most preferably at least 80% of the length of the planing board body (measured from the blade tip to the rear end of the rear end turn). The first longitudinal section preferably extends over at least 80%, more preferably at least 90% and particularly preferably at least 95% of the length of the wood core.
Der zweite Längsabschnitt erstreckt sich bevorzugt über mindestens 60 %, stärker bevorzugt mindestens 70 % und besonders bevorzugt mindestens 80 % der Länge des Gleitbrettkörpers. Bevorzugt erstreckt sich der zweite Längsabschnitt über mindestens 80 %, stärker bevorzugt mindestens 90 % und besonders bevorzugt mindestens 95 % der Länge des Holzkerns.The second longitudinal section preferably extends over at least 60%, more preferably at least 70% and particularly preferably at least 80% of the length of the gliding board body. The second longitudinal section preferably extends over at least 80%, more preferably at least 90% and particularly preferably at least 95% of the length of the wood core.
Der dritte Längsabschnitt erstreckt sich bevorzugt über mindestens 60 %, stärker bevorzugt mindestens 70 % und besonders bevorzugt mindestens 80 % der Länge des Gleitbrettkörpers. Bevorzugt erstreckt sich der dritte Längsabschnitt über mindestens 80 %, stärker bevorzugt mindestens 90 % und besonders bevorzugt mindestens 95 % der Länge des Holzkerns.The third longitudinal section preferably extends over at least 60%, more preferably at least 70% and particularly preferably at least 80% of the length of the gliding board body. The third longitudinal section preferably extends over at least 80%, more preferably at least 90% and particularly preferably at least 95% of the length of the wood core.
Der vierte Längsabschnitt erstreckt sich bevorzugt über mindestens 60 %, stärker bevorzugt mindestens 70 % und besonders bevorzugt mindestens 80 % der Länge des Gleitbrettkörpers. Bevorzugt erstreckt sich der vierte Längsabschnitt über mindestens 80 %, stärker bevorzugt mindestens 90 % und besonders bevorzugt mindestens 95 % der Länge des Holzkerns.The fourth longitudinal section preferably extends over at least 60%, more preferably at least 70% and particularly preferably at least 80% of the length of the gliding board body. The fourth longitudinal section preferably extends over at least 80%, more preferably at least 90% and particularly preferably at least 95% of the length of the wood core.
Bevorzugt erstreckt sich der Holzkern über höchstens 95 %, stärker bevorzugt höchstens 90 % und besonders bevorzugt höchstens 85 % der Länge des Gleitbrettkörpers und/oder über mindestens 50 %, bevorzugt mindestens 60 % und besonders bevorzugt mindestens 70 % der Länge des Gleitbrettkörpers.The wood core preferably extends over at most 95%, more preferably at most 90% and particularly preferably at most 85% of the length of the gliding board body and/or over at least 50%, preferably at least 60% and particularly preferably at least 70% of the length of the gliding board body.
Die vorliegende Erfindung richtet sich ferner auf ein Verfahren zur Herstellung eines Gleitbrettkörpers, insbesondere eines Gleitbrettkörpers wie oben beschrieben. Erfindungsgemäß wird zunächst eine obere Deckschicht, ein Obergurt mit einer oder mehreren Obergurtlagen, eine Lauffläche, ein Untergurt mit einer oder mehreren Untergurtlagen und ein Holzkern mit einer Oberseite, einer Unterseite und mindestens zwei Seitenflächen sowie mindestens zwei mit den jeweiligen Seitenflächen des Holzkerns verbundene Seitenwangen in eine Form derart eingebracht, dass (i) zwischen dem Obergurt und der Oberseite des Holzkerns und/oder (ii) zwischen dem Obergurt und der Deckschicht und/oder (iii) zwischen einer ersten Obergurtlage und einer zweiten Obergurtlage ein erster Zwischenraum besteht und dass (i) zwischen der Lauffläche und der Unterseite des Holzkerns und/oder (ii) zwischen der Unterseite des Holzkerns und dem Untergurt und/oder (iii) zwischen einer ersten Untergurtlage und einer zweiten Untergurtlage ein zweiter Zwischenraum besteht. Anschließend wird ein PU-Material in den ersten und zweiten Zwischenraum unter Ausbildung eines PU-Schaums im ersten und zweiten Zwischenraum eingespritzt, um die jeweils an die Zwischenräume angrenzenden Lagen miteinander zu verkleben. Dabei wird der erste Zwischenraum und der zweite Zwischenraum bevorzugt vollständig mit PU-Schaum ausgefüllt.The present invention is also aimed at a method for producing a gliding board body, in particular a gliding board body as described above. According to the invention, an upper cover layer, an upper belt with one or more upper belt layers, a tread, a lower belt with one or more lower belt layers and a wood core with an upper side, an underside and at least two side surfaces and at least two side walls connected to the respective side surfaces of the wood core are introduced a form such that (i) between the top chord and the top side of the wood core and/or (ii) between the top chord and the cover layer and/or (iii) between a first top chord layer and a second top chord layer there is a first intermediate space and that ( i) there is a second gap between the tread and the underside of the wood core and/or (ii) between the underside of the wood core and the base ply and/or (iii) between a first base ply and a second base ply. A PU material is then injected into the first and second spaces to form a PU foam in the first and second spaces in order to bond the layers adjoining the spaces to one another. In this case, the first intermediate space and the second intermediate space are preferably completely filled with PU foam.
Bevorzugt erstreckt sich der erste Zwischenraum jeweils auch zwischen dem Obergurt und der Oberseite der jeweiligen Seitenwange und/oder der zweite Zwischenraum jeweils auch zwischen dem Untergurt und der Unterseite der jeweiligen Seitenwange.Preferably, the first intermediate space also extends between the upper flange and the top side of the respective side panel and/or the second intermediate space also extends between the lower flange and the bottom side of the respective side panel.
Es ist ferner bevorzugt, dass die Seitenwangen vor dem Einbringen in die Form mit dem Holzkern verbunden, bspw. verklebt, werden.It is also preferred that the side walls are connected, for example glued, to the wood core before being introduced into the mold.
Das Einspritzen des PU-Materials erfolgt bevorzugt derart, dass sich die erste Materialfront im ersten Zwischenraum während des Einspritzvorgangs etwa gleich schnell nach vorne bewegt wie die zweite Materialfront im zweiten Zwischenraum. Dadurch wird verhindert, dass durch das vorschnelle Vordringen einer Materialfront die geometrische Anordnung der einzelnen Komponenten innerhalb der Form durch eine entsprechende Ausdehnung des PU-Schaums gefährdet wird. Dabei ist es bevorzugt, dass der Abstand in Längsrichtung des Gleitbrettkörpers zwischen der ersten Materialfront und der zweiten Materialfront während des Einspritzvorgangs immer kleiner als 10 cm, bevorzugt kleiner als 7 cm und besonders bevorzugt kleiner als 5 cm ist.The PU material is preferably injected in such a way that the first material front in the first intermediate space moves forward during the injection process at approximately the same speed as the second material front in the second intermediate space. This prevents the geometric arrangement of the individual components within the mold from being jeopardized by a corresponding expansion of the PU foam due to the hasty advance of a material front. It is preferred that the distance in the longitudinal direction of the gliding board body between the first material front and the second material front during the injection process is always less than 10 cm, preferably less than 7 cm and particularly preferably less than 5 cm.
Bevorzugt wird das PU-Material von einem längsseitigen Ende der Form in die Zwischenräume eingespritzt.The PU material is preferably injected into the interstices from a longitudinal end of the mold.
Es ist ferner bevorzugt, dass sich die Dicke des Holzkerns am vorderen und/oder hinteren Ende des Holzkerns verjüngt.It is further preferred that the thickness of the wood core tapers at the front and/or rear end of the wood core.
Es sei explizit darauf hingewiesen, dass bevorzugte Merkmale des erfindungsgemäßen Gleitbrettkörpers auch als bevorzugte Merkmale im Rahmen des Herstellungsverfahrens Verwendung finden können und vice versa. So ist es beispielsweise auch bevorzugt, dass der erste und zweite Zwischenraum derart ausgebildet sind, dass die bevorzugten Maße des erfindungsgemäßen Gleitbrettkörpers erzielt werden können. So ist es beispielsweise bevorzugt, dass zumindest entlang eines Längsabschnitts der Form für jeden Querschnitt senkrecht zur Längsachse der Form die durchschnittliche Dicke des ersten und/oder zweiten Zwischenraums kleiner als 4 mm, bevorzugt kleiner als 3 mm und besonders bevorzugt kleiner als 2 mm ist.It should be explicitly pointed out that preferred features of the gliding board body according to the invention can also be used as preferred features within the scope of the manufacturing process and vice versa. For example, it is also preferred that the first and second spaces are designed in such a way that the preferred dimensions of the sliding board body according to the invention can be achieved. For example, it is preferred that at least along a longitudinal section of the mold for each cross-section perpendicular to the longitudinal axis of the mold the average thickness of the first and/or second gap is less than 4 mm, preferably less than 3 mm and particularly preferably less than 2 mm.
Nachfolgend werden bevorzugte Ausführungsformen der vorliegenden Erfindung anhand der Figuren näher erläutert. Es zeigen:
- Fig. 1
- einen Querschnitt durch einen Gleitbrettkörper gemäß einer bevorzugten Ausführungsform der vorliegenden Erfindung;
- Fig. 2
- einen Querschnitt durch einen Gleitbrettkörper gemäß einer weiteren bevorzugten Ausführungsform der vorliegenden Erfindung;
- Fig. 3
- einen Querschnitt durch einen Gleitbrettkörper gemäß einer weiteren bevorzugten Ausführungsform der vorliegenden Erfindung;
- Fig. 4
- einen Querschnitt durch einen Gleitbrettkörper gemäß einer weiteren bevorzugten Ausführungsform der vorliegenden Erfindung;
- Fig. 5
- einen Längsschnitt durch eine Form zur Herstellung eines erfindungsgemäßen Gleitbrettkörpers;
- Fig. 5a bis 5c
- vergrößerte Ausschnitte der
Figur 5 gemäß den Details 1 bis 3; - Fig. 6
- einen Querschnitt durch einen Gleitbrettkörper gemäß einer weiteren bevorzugten Ausführungsform der vorliegenden Erfindung; und
- Fig. 7
- einen Querschnitt durch einen Gleitbrettkörper gemäß einer weiteren bevorzugten Ausführungsform der vorliegenden Erfindung.
- 1
- a cross section through a sliding board body according to a preferred embodiment of the present invention;
- 2
- a cross section through a sliding board body according to a further preferred embodiment of the present invention;
- 3
- a cross section through a sliding board body according to a further preferred embodiment of the present invention;
- 4
- a cross section through a sliding board body according to a further preferred embodiment of the present invention;
- figure 5
- a longitudinal section through a mold for producing a sliding board body according to the invention;
- Figures 5a to 5c
- enlarged sections of the
figure 5 according to details 1 to 3; - 6
- a cross section through a sliding board body according to a further preferred embodiment of the present invention; and
- 7
- a cross section through a sliding board body according to a further preferred embodiment of the present invention.
In Ausführungsform gemäß
Dies wird beispielsweise anhand der bevorzugten Ausführungsformen gemäß den
Eine ähnliche Lösung bietet sich an, wenn der Holzkern 1 ungleichmäßig geformt ist. In
Um eine möglichst homogene Anbindung der Schichten zu erreichen, ist es ferner bevorzugt, dass sich die erste und/oder zweite Verbindungsschicht in einem Querschnitt senkrecht zur Längsachse des Gleitbrettkörpers durchgehend von einer Seitenwange 2 zur gegenüberliegenden Seitenwange 2 erstreckt.In order to achieve the most homogeneous possible connection of the layers, it is also preferred that the first and/or second connecting layer extends continuously from one
Auch wenn die erste und/oder zweite Verbindungsschicht, wie oben erläutert, mittels eines dicken Profils dazu dienen kann, Variabilitäten im Abstand zwischen dem Holzkern und dem Obergurt bzw. Untergurt auszugleichen, so ist es dennoch bevorzugt, dass die erste und/oder zweite Verbindungsschicht aus PU-Schaum eine dünne Klebstoffschicht bildet und nicht, wie bei herkömmlichen PU-Gleitbrettkörpern, die mechanischen Eigenschaften dominiert. Hierfür ist es bevorzugt, dass zumindest entlang eines ersten Längsabschnitts des Gleitbrettkörpers für jeden Querschnitt senkrecht zur Längsachse des Gleitbrettkörpers die maximale Dicke der ersten und/oder zweiten Verbindungsschicht kleiner ist als die maximale Dicke des Holzkerns, bevorzugt kleiner als die minimale Dicke des Holzkerns. Die entsprechenden Dicken sind lediglich beispielhaft in einem Querschnitt senkrecht zur Längsachse des Gleitbrettkörpers gemäß
Es ist ferner bevorzugt, dass zumindest entlang eines bestimmten Längsabschnitts des Gleitbrettkörpers für jeden Querschnitt senkrecht zur Längsachse des Gleitbrettkörpers das Verhältnis der Querschnittsfläche des Holzkerns der Gesamtquerschnittsfläche aus erster und zweiter Verbindungsschicht mindestens 1,0, bevorzugt mindestens 1,5 und besonders bevorzugt mindestens 2,0 beträgt. Um dies nochmals am Beispiel der
Nachfolgend soll das erfindungsgemäße Verfahren anhand von
Im zentralen Abschnitt des Mittelteils 11 hat der Holzkern 1 in der dargestellten Ausführungsform eine im Wesentlichen konstante Dicke (bzw. eine lediglich sehr schwach variable Dicke), sodass oberhalb und unterhalb des Holzkerns 1 jeweils ein Zwischenraum mit im Wesentlichen konstanter Dicke gebildet wird, der im Laufe des Verfahrens mit PU-Schaum ausgefüllt werden wird. Je nach Ausführungsform (vgl.
In der dargestellten bevorzugten Ausführungsform ist die durch die beiden Formhälften 14 und 15 gebildete Form 10 im Bereich des Hinterendes - abgesehen von einem nicht dargestellten Auslass für die durch den Schaum verdrängte Luft - geschlossen (vgl.
Auch wenn bei dieser Ausführungsform beide Zwischenräume 18 und 19 mit PU-Schaum befüllt werden, ist es auch vorstellbar, dass nur ein Zwischenraum vorgesehen ist und die jeweils andere Anbindung des Holzkerns an die entsprechende angrenzende Lage bspw. durch ein Harz erfolgt.Even if both spaces 18 and 19 are filled with PU foam in this embodiment, it is also conceivable that only one space is provided and the respective other connection of the wood core to the corresponding adjacent layer takes place, for example, by a resin.
Nachfolgend wird ein Ausführungsbeispiel des erfindungsgemäßen Verfahrens näher beschrieben.An exemplary embodiment of the method according to the invention is described in more detail below.
Ein Vorteil des erfindungsgemäßen Verfahrens ist es, dass dieses mit herkömmlichen PU-Schäum-Anlagen durchgeführt werden kann. Für das vorliegende Ausführungsbeispiel wurde eine PUR-Hochdruckreaktionsgießmaschine HK zur Verarbeitung von hartem Integralschaum des Herstellers Hennecke verwendet. In Verbindung mit dem eingesetzten Mischkopf erlaubt diese Maschine die Herstellung aller Arten von Hartschäumen sowie insbesondere von Integralschäumen. Als PU-Material wurde das Integralschaumsystem bestehend aus Modipur® US452 schwarz und Isocyanat US20 erhältlich bei Hexcel verwendet. Es handelt sich hierbei um ein Treibgas-freies System für Schäume mit hohem Elastizitätsmodul. Die beiden Komponenten dieses Integralschaumsystems wurden bei einer Verarbeitungstemperatur von 28 bis 32 °C im Mischkopf gemischt und die Mischung durch die am Schaufelkopf vorhandene Einspritzöffnung 17 (vgl.
Bei verschiedenen mechanischen Tests konnte eine durchgehende stabile Verbindung zwischen dem Holzkern sowie dem Obergurt und dem Untergurt des Gleitbrettkörpers nachgewiesen werden. Der so hergestellte Gleitbrettkörper hatte exzellente mechanische Eigenschaften.A continuous, stable connection between the wooden core and the upper and lower chords of the gliding board body was demonstrated in various mechanical tests. The gliding board body thus produced had excellent mechanical properties.
Selbstverständlich können auch andere Materialien als das hier beispielhaft verwendete Material zum Einsatz kommen. Hierbei ist es jedoch von Vorteil, wenn die Viskosität der Mischung beim Einspritzen möglichst gering ist, um sicherzustellen, dass das PU-Material problemlos in kleine Zwischenräume eindringen kann. Bevorzugt beträgt die Viskosität bei 25°C weniger als 1000 mPa·s, stärker bevorzugt weniger als 800 mPa·s und besonders bevorzugt weniger als 700 mPa·s.Materials other than the material used here as an example can of course also be used. However, it is advantageous here if the viscosity of the mixture during injection is as low as possible to ensure that the PU material can easily penetrate small gaps. Preferably the viscosity at 25°C is less than 1000 mPas, more preferably less than 800 mPas and most preferably less than 700 mPas.
Die vorstehend beschriebenen Ausführungsformen bezogen sich jeweils auf die erste Variante der vorliegenden Erfindung, bei der eine erste Verbindungsschicht zwischen der Oberseite des Holzkerns und dem Obergurt und eine zweite Verbindungsschicht zwischen der Unterseite des Holzkerns und dem Untergurt vorgesehen ist. Alternativ kann aber auch eine erste Verbindungsschicht zwischen dem Obergurt und der Deckschicht und/oder zwischen einer ersten Obergurtlage und einer zweiten Obergurtlage angeordnet sein und eine zweite Verbindungsschicht zwischen dem Untergurt und der Lauffläche und/oder zwischen einer ersten Untergurtlage und einer zweiten Untergurtlage angeordnet sein.The embodiments described above each relate to the first variant of the present invention, in which a first connecting layer is provided between the top side of the wood core and the top chord and a second connecting layer is provided between the bottom side of the wood core and the bottom chord. Alternatively, however, a first connecting layer can also be arranged between the upper belt and the cover layer and/or between a first upper belt layer and a second upper belt layer and a second Connection layer can be arranged between the bottom belt and the tread and/or between a first bottom belt layer and a second bottom belt layer.
Zwei dieser Varianten sind in den
In
Selbstverständlich müssen die Ober- bzw. Untergurtlagen im Hinblick auf deren Anordnung nicht analog behandelt werden, wie dies in den
Claims (13)
- A sliding board body having a longitudinal axis and comprising:a wood core (1) having a top face (1a), a bottom face (1b) and two side faces (1c);two sidewalls (2) connected to the respective side faces (1c) of the wood core (1);a top reinforcement (3) comprising one or more top reinforcement layers (3a, 3b) above the top face (1a) of the wood core (1);a top cover layer (4) above the top reinforcement (3);a bottom reinforcement (5) comprising one or more bottom reinforcement layers (5a, 5b) below the bottom face (1b) of the wood core (1);a running surface (6) comprising lateral edges (6a) below the bottom reinforcement (5);a first connecting layer (7) that is arranged (i) between the top face (1a) of the wood core (1) and the top reinforcement (3) and/or (ii) between the top reinforcement (3) and the cover layer (4) and/or (iii) between a first top reinforcement layer (3a) and a second top reinforcement layer (3b) of the plurality of top reinforcement layers (3a, 3b) and adheres the layers respectively adjacent thereto to each other; anda second connecting layer (8) that is arranged (i) between the bottom face (1b) of the wood core (1) and the bottom reinforcement (5) and/or (ii) between the bottom reinforcement (5a) and the running surface (6) and/or (iii) between a first bottom reinforcement layer (5a) and a second bottom reinforcement layer (5b) of the plurality of bottom reinforcement layers (5a, 5b) and adheres the layers respectively adjacent thereto to each other;wherein the first and/or the second connecting layer (7, 8) comprises PU foam;wherein the first connecting layer (7) continuously extends in a cross-section perpendicular to the longitudinal axis of the sliding board body from one sidewall (2) to the opposite sidewall (2) and/or from a lateral border of the sliding board body to the opposite lateral border of the sliding board body; and orwherein the second connecting layer (8) continuously extends in a cross-section perpendicular to the longitudinal axis of the sliding board body from one sidewall (2) to the opposite sidewall (2) and/or from one lateral edge (6a) of the running surface (6) to the opposite lateral edge (6a) of the running surface (6) and/or from a lateral border of the sliding board body to the opposite lateral border of the sliding board body.
- The sliding board body according to claim 1, wherein, at least along a first longitudinal portion of the sliding board body for any cross-section perpendicular to the longitudinal axis of the sliding board body, the maximum thickness of the first and/or the second connecting layer (7, 8) is smaller than the maximum thickness of the wood core (1), preferably smaller than the minimum thickness of the wood core (1).
- The sliding board body according to any one of the preceding claims, wherein, at least along a second longitudinal portion of the sliding board body for any cross-section perpendicular to the longitudinal axis of the sliding board body, the average thickness of the first and/or the second connecting layer (7, 8) is smaller than the average thickness of the wood core (1).
- The sliding board body according to any one of the preceding claims, wherein, at least along a third longitudinal portion of the sliding board body for any cross-section perpendicular to the longitudinal axis of the sliding board body, the average thickness of the first and/or the second connecting layer (7, 8) is smaller than 4 mm, preferably smaller than 3 mm, particularly preferably smaller than 2 mm.
- The sliding board body according to any one of the preceding claims, wherein, at least along a fourth longitudinal portion of the sliding board body for any cross-section perpendicular to the longitudinal axis of the sliding board body, the ratio of the cross-sectional area of the wood core (1) to the total cross-sectional area of the first and second connecting layers (7, 8) is at least 1.0, preferably at least 1.5 and particularly preferably at least 2.0.
- The sliding board body according to any one of claims 2 to 5, wherein the first, second, third and/or fourth longitudinal portion extends over at least 60%, preferably at least 70%, particularly preferably at least 80% of the length of the sliding board body, and/or wherein the first, second, third and/or fourth longitudinal portion extends over at least 80%, preferably at least 90%, particularly preferably at least 95% of the length of the wood core.
- The sliding board body according to any one of the preceding claims, wherein the wood core (1) extends over at most 95%, preferably at most 90%, particularly preferably at most 85% of the length of the sliding board body and/or over at least 50%, preferably at least 60%, particularly preferably at least 70% of the length of the sliding board body.
- A method for manufacturing a sliding board body, in particular a sliding board body according to any one of the preceding claims, comprising the steps of(a) inserting a top cover layer (4), a top reinforcement (3) comprising one or more top reinforcement layers (3a, 3b), a running surface (6), a bottom reinforcement (5) comprising one or more bottom reinforcement layers (5a, 5b), and a wood core (1) having a top face (1a), a bottom face (1b) and two side faces (1c), as well as two sidewalls (2) connected to the respective side faces (1c) of the wood core (1) into a mold (10) such that there is a first space (18) (i) between the top reinforcement (3) and the top face (1a) of the wood core (1) and/or (ii) between the top reinforcement (3) and the cover layer (4) and/or (iii) between a first top reinforcement layer (3a) and a second top reinforcement layer (3b), and that there is a second space (19) (i) between the running surface (6) and the bottom face (1b) of the wood core (1) and/or (ii) between the bottom face (1b) of the wood core (1) and the bottom reinforcement (5) and/or (iii) between a first bottom reinforcement layer (5a) and a second bottom reinforcement layer (5b); and(b) injecting a PU material into the first and second spaces (18, 19), forming a PU foam in the first and second spaces (18, 19), in order to adhere the layers respectively adjacent to the spaces (18, 19) to each other.
- The method according to claim 8, wherein the first space (18) also respectively extends between the top reinforcement (3) and the top face of the respective sidewall (2) and/or wherein the second space (19) also respectively extends between the bottom reinforcement (5) and the bottom face of the respective sidewall (2).
- The method according to claim 8 or 9, wherein the sidewalls (2) are connected to the wood core (1) before being inserted into the mold (10).
- The method according to any one of claims 8 to 10, wherein the injection of the PU material takes place such that the first material front in the first space (18) moves forward at approximately the same speed as the second material front in the second space (19) during the injection operation, wherein preferably the distance in the longitudinal direction of the sliding board body between the first material front and the second material front is always less than 10 cm, preferably less than 7 cm, particularly preferably less than 5 cm, during the injection operation.
- The method according to any one of claims 8 to 11, wherein the PU material is injected into the spaces (18, 19) from a longitudinal-side end (12; 13) of the mold (10).
- The method according to any one of claims 8 to 12, wherein the thickness of the wood core (1) tapers at the front end and/or rear end of the wood core.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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EP20165635.2A EP3885009B1 (en) | 2020-03-25 | 2020-03-25 | Sliding board body with wooden core and pu foam connecting layers below and/or above the core |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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EP20165635.2A EP3885009B1 (en) | 2020-03-25 | 2020-03-25 | Sliding board body with wooden core and pu foam connecting layers below and/or above the core |
Publications (2)
Publication Number | Publication Date |
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EP3885009A1 EP3885009A1 (en) | 2021-09-29 |
EP3885009B1 true EP3885009B1 (en) | 2022-03-23 |
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EP20165635.2A Active EP3885009B1 (en) | 2020-03-25 | 2020-03-25 | Sliding board body with wooden core and pu foam connecting layers below and/or above the core |
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Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NO870539L (en) * | 1986-02-21 | 1987-08-24 | Rohrmoser Alois Skifabrik | REINFORCEMENT ELEMENT FOR INCORPORATION IN A RESIN AND USE OF THIS ELEMENT. |
FR2611518B1 (en) * | 1987-02-27 | 1989-11-17 | Salomon Sa | DISTRIBUTED DAMPING SKI |
DE4322300C2 (en) * | 1992-07-16 | 2002-12-19 | Atomic Austria Gmbh Altenmarkt | Ski with a shell, a lower flange and an upper flange, preferably integrated into the shell, and method for producing a ski |
FR2703915B1 (en) * | 1993-04-16 | 1995-06-02 | Rossignol Sa | Ski with edges and upper shell. |
FR2847483B1 (en) * | 2002-11-22 | 2004-12-24 | Rossignol Sa | SLIDING BOARD AND METHOD FOR MANUFACTURING SUCH A SLIDING BOARD |
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2020
- 2020-03-25 EP EP20165635.2A patent/EP3885009B1/en active Active
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