Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
  • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
  • B63B32/00—Water sports boards; Accessories therefor
  • B63B32/50—Boards characterised by their constructional features
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
  • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
  • B63B32/00—Water sports boards; Accessories therefor
  • B63B32/40—Twintip boards; Wakeboards; Surfboards; Windsurfing boards; Paddle boards, e.g. SUP boards; Accessories specially adapted therefor

Definitions

• the invention relates to a method for producing sail or surfboards according to the preamble of claim 1 and to a sail or surfboard according to the preamble of claim 8.
• EPS expanding polystyrene
• a foaming adhesive is applied to the EPS core before it is inserted.
• This is, for example, a foaming adhesive based on polyurethane or epoxy. It also serves to compensate for tolerances between the core and the shell.
• the disadvantage of the known method is that the thickness of the shell parts and the density of the EPS core must be chosen to be relatively high in order to achieve sufficient compressive strength and rigidity over a long service life.
• the two shell parts are adhesively bonded is difficult to reach with each other.
• the so-called single-shell construction is more favorable, in which the EPS core is already heated between the shell parts and is therefore plastic, so that the deep-drawn shell parts are welded to one another and possibly also to the core material when they are subsequently joined together.
• this requires a high dimensional accuracy of the EPS core, which, in addition to high manufacturing costs, is contrary to the time shrinkage behavior of the expanding polystyrene.
• the EPS core must also be handled very carefully before it is inserted between the shell parts, since any damage to the core affects the connection between the core and the shell. In addition, there is the problem of ventilation when assembling the shell parts.
• the invention is therefore based on the object to provide a method according to the preamble of claim 1, which can produce a light board of high strength and long life.
• the invention also relates to a sailing or surfboard with these properties.
• the claim 8 characterizes a he inventive sail or surfboard.
• a support layer is formed at least in regions between the foam core and the shell, which fixes the foam core element spatially exactly, due to its own elasticity tolerance problems of the EPS Foam core is eliminated and the compressive strength of the core is increased.
• the qualitative requirements for the foam core element are therefore significantly lower, which also leads to a cost reduction in the production of the foam core element.
• Invention is the foam formed by the undersize of the foam core element / in which the Fadehgewirk is located. This can advantageously be done by injecting a foaming substance into this hollow space after the shell parts have been joined together.
• a foaming adhesive can be applied to the foam core element in the area of the knitted fabric and fills the cavity after the shell parts have been joined together. In this way, greater manufacturing tolerances in the manufacture of the foam core element and damage to the same remain completely without any influence on the board quality, since all existing cavities are filled with foam.
• This foam also serves as a secure binder between the shell and the core in the manner of an adhesive.
• the foam forms a thread-reinforced edge zone, which connects the shell with the foam core element and has excellent pressure resistance, so that it absorbs loads that are transmitted through the shell inwards. This makes it possible to use extraordinarily light foam (up to 12 gr / ltr) for the foam core element without the overall strength of the board suffering.
• Advantageous embodiments of the invention are the subject of the dependent claims.
• a foam core element 1 is produced for sailing or surfboards. This does not already have the nominal size of the foam core, but it is manufactured with an undersize of, for example, 15 mm. Depending on the requirements placed on the sail board, the foam core element is produced all around with this undersize, or only certain outside surface areas are given this undersize. For example, the overall dimension can be limited to the outer surface area of the foam core element, which corresponds to the upper surface of the sailing board or only the standing surface of the sailing board. Expanding polystyrene or another lightweight packing material is particularly suitable as the material for the foam core element, with a density of 12 to 15 gr / liter.
• the undersized surface areas of the foam core element 1 are then covered with a knitted thread 2, so that the resulting composite element receives the target contour of the core.
• the knitted thread 2 is expediently needled onto the foam core element. It has the shape of a mat with a thickness that corresponds to the undersize, for example 15 mm.
• the knitted thread consists of relatively stiff plastic threads that run through the space of the mat irregularly and in places of mutual loading are welded together.
• it is polypropylene threads.
• the mat is so flexible that it can be needled onto curved surfaces, while on the other hand it is relatively hard perpendicular to the plane of the mat and can absorb and transmit appropriate loads. Flexibility and hardness naturally depend on the rigidity and number of threads per unit volume.
• a knitted fabric made of plastic threads one made of metal, such as aluminum wires, or even a knitted fabric made of, for example, coconut fibers can also be used.
• the foam core element 1 provided with the knitted thread 2 is then inserted between two deep-drawn shell parts 3 and 4 of the sailing board and the shells are then joined together via the foam core element.
• the two-shell construction can be used, in which the two shell parts 3, 4 are glued to each other at their butt joint, or the single-shell construction, in which the foam core element 1 is inserted between the shell parts 3, 4 while the shell parts 3 are still heated and thus plastic and the shell parts are then welded together when they are joined together.
• Thermoplastic or thermosetting plastics can be used as the material for the shell parts.
• the shell parts are still in a plastic state when they are joined together, welding can occur between the shell parts and the knitted thread thread, while the knitted thread penetrates the foam core element 1 slightly when the shell parts are joined and there is mechanically anchored next to the needling.
• a second variant of the method is to foam the cavity formed by the undersize of the foam core element, in which the knitted yarn 2 is located. This can be done by applying foaming adhesive to the foam core element 1 over the undersize area of the foam core element 1. This foaming adhesive based on polyurethane or epoxy then completely fills the cavity created when the shell parts are joined with foam 5.
• An advantageous embodiment of the method is to foam the cavity in which the knitted fabric is located after the shell parts have been joined by injecting a foaming substance, in particular polyurethane or epoxy foam 5. The foaming substance wets the knitted thread and fills all cavities, in particular also damaged areas of the foam core element 1. This foaming produces an intermediate layer between the shell and the foam core element in the undersize areas of foam reinforced by the thread knit fabric, which has excellent compressive strength and is reliable Connects between the shell and the foam core element, which is equivalent to gluing.

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• Ocean & Marine Engineering (AREA)
• Laminated Bodies (AREA)
• Reinforced Plastic Materials (AREA)
• Steering Devices For Bicycles And Motorcycles (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6131992

Family Applications (1)

Country Status (6)

Cited By (6)

Families Citing this family (10)

Citations (4)

Family Cites Families (8)

• 1981
  • 1981-05-11 DE DE3118631A patent/DE3118631C2/de not_active Expired
• 1982
  • 1982-05-11 AU AU83935/82A patent/AU556390B2/en not_active Ceased
  • 1982-05-11 WO PCT/CH1982/000068 patent/WO1982004023A1/de not_active Ceased
  • 1982-05-11 JP JP57501435A patent/JPS58500691A/ja active Granted
  • 1982-05-11 EP EP82710028A patent/EP0064937B1/de not_active Expired
  • 1982-05-11 AT AT82710028T patent/ATE18880T1/de not_active IP Right Cessation

Patent Citations (4)

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