WO1998042496A1 - Verfahren und vorrichtung zur herstellung von surfbrettern - Google Patents
Verfahren und vorrichtung zur herstellung von surfbrettern Download PDFInfo
- Publication number
- WO1998042496A1 WO1998042496A1 PCT/CH1998/000111 CH9800111W WO9842496A1 WO 1998042496 A1 WO1998042496 A1 WO 1998042496A1 CH 9800111 W CH9800111 W CH 9800111W WO 9842496 A1 WO9842496 A1 WO 9842496A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- hollow body
- gas
- impermeable
- cover
- inner bag
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
- B29C70/44—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
- B29C43/10—Isostatic pressing, i.e. using non-rigid pressure-exerting members against rigid parts or dies
- B29C43/12—Isostatic pressing, i.e. using non-rigid pressure-exerting members against rigid parts or dies using bags surrounding the moulding material or using membranes contacting the moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
- B29C70/86—Incorporated in coherent impregnated reinforcing layers, e.g. by winding
- B29C70/865—Incorporated in coherent impregnated reinforcing layers, e.g. by winding completely encapsulated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
- B29K2105/08—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns
- B29K2105/0854—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns in the form of a non-woven mat
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2024/00—Articles with hollow walls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/52—Sports equipment ; Games; Articles for amusement; Toys
- B29L2031/5272—Surf boards
Definitions
- the invention relates to a method for producing a one-piece, in particular closed, hollow body according to the preamble of patent claim 1, a device for carrying out the method according to the preamble of patent claim 8 and a one-piece hollow body produced by such a method according to the preamble of patent claim 12.
- the honeycomb structure of the upper part is first covered with the prepregs, that is to say they project significantly beyond the structure and are placed in a negative form the inserted structure is covered and a vacuum is created between the negative mold and the membrane, which means that the prepregs are pressed better onto the honeycomb structure, and the lower part is inserted and treated in a corresponding negative mold, and the two parts are then placed on top of one another
- the two negative molds are then pressed together with a pressure of 20 bar and closed sacks are placed inside the chambers formed by the upper and lower parts, which act on the walls with a pressure of 3 bar become T .
- the one-piece hollow body formed in this way has the disadvantage that only the prepregs are arranged to overlap in the butt regions between the upper and the lower part and no honeycomb structure is provided. Therefore, the edge areas of such a hollow body are too weak for many applications.
- the support walls are absolutely necessary. Because of the very high load on the negative mold, the known hollow body must be made relatively thick-walled in order to withstand the high pressures. This inevitably results Hollow body with a relatively high weight. It has also been found that in many cases a surfboard manufactured using the method described above does not meet the required requirements with regard to inherent and torsional rigidity.
- the invention is therefore based on the object of improving a one-piece hollow body of the aforementioned type in such a way that the hollow body can be produced with a lower dead weight and also without supporting walls with a substantially higher stability and torsional rigidity.
- the invention has the great advantage that a one-piece hollow body of high stability and inherent rigidity can be produced with a relatively simple method in more or less one treatment step. It is particularly advantageous if the gas pressures prevail at least approximately inside and outside the hollow body to be produced.
- the normal atmospheric pressure or an overpressure of up to 2 atm can be used for curing according to claim 4.
- the supporting, in particular honeycomb-shaped structure of adjoining half-shells is formed and the synthetic resin-impregnated fabric is applied overlapping over the edge regions of the half-shells. This creates an extremely stable hollow body.
- one or more supporting walls can be provided between the half-shells, which can be arranged both in the longitudinal direction and in the transverse direction to the longitudinal expansion of the hollow body.
- FIG. 1 is a perspective view of a device for producing a hollow body, in particular a surfboard,
- FIG. 3 shows a cross section through the device along the line III-III in FIG. 1,
- Fig. 5 shows the upper part of the negative form, and 6 the lower part of the negative form,
- FIG. 7 is a partial section through the hollow body with two inner bags in a perspective view
- Fig. 8 is a double connection for the inner bags
- FIG. 9 shows a variant of the double connection from FIG. 8.
- FIG. 1 shows a device for producing a one-piece, closed hollow body, in particular a windsurf board.
- the clamping mold 1 has a lower part with a flexible table frame 2, which carries a flexible table top 3, for example made of a thin aluminum sheet.
- This table top 3 can be adapted to the shape desired for the underside of the surfboard by means of three parallel rows of threaded rods 49. To this end, a longitudinal section can sometimes be provided in the aluminum sheet (see FIG. 6).
- the upper part of the clamping mold 1 consists of two quarter shells which are screwed together to form a half shell 5 (see FIG. 5). These quarter shells can consist of a high temperature resistant plastic or also of a thin aluminum sheet.
- the half-shell 5 Above the half-shell 5 is an upper radiator 6 and a lower heating element 7 is provided below the table top 3. Furthermore, two holes 8 and 9 are provided in the edge of the table top 3, each of which is used for connecting a vacuum line 10 and 11. These vacuum lines 10 and 11 are brought together via a Y-shaped branch to form a common line 12, which leads to a vacuum pump (not shown further here).
- FIG. 2 shows the cross section II-II in the front area through the device of Figure 1.
- the closed hollow body 15 of the windsurfing board can be seen, which consists of a plate-shaped lower part 17 and a bowl-shaped upper part 16 and one Longitudinal beam 18 consists of honeycomb plastic plates.
- the upper part 16 is covered on the outside with a cover layer 44 and on the inside with a cover layer 45.
- the longitudinal spar 18 is also laterally covered with cover layers 46.
- the lower part 17 is provided on the inside with a cover layer 47 and on the outside with a cover layer 48.
- These cover layers 44 to 48 consist of synthetic cloth impregnated with synthetic resin, which can be placed one above the other several times.
- a gas-impermeable cover 14 for example a plastic film, which is clamped gas-tight on the edge of the table frame 2 by means of screw clamps 26, so that the clamping mold 1 is only connected to the outside through the holes 8 and 9 .
- a venting cloth 14 ′ is provided between the clamping mold 1 and the cover 14, so that the holes 8 and 9 of the vacuum suction are not closed by the cover 14.
- Figure 3 shows the cross section III-III in the central region through the device of Figure 1.
- the longitudinal spar 18 here has reinforcements 23 which ensure the necessary stability for the receptacle 24 of a mast foot.
- the lower part 17 is V-shaped in the central region of the surfboard.
- the supports of the table frame 2 which are designed as wooden beams, are connected to one another at an obtuse angle by means of a connecting plate.
- FIG. 4 shows the cross section IV-IV in the end region through the device of FIG. 1.
- the supports of the table frame 2 are also arranged at an obtuse angle to one another.
- the longitudinal spar 18 is here also provided with lateral reinforcements 23 in order to form a receptacle 25 for the fin.
- FIG. 5 shows a partial view of the half-shell 5 of the clamping mold 1, which here consists of two egg-shaped quarter-shells 27.
- the quarter shells 27 are screwed together by means of upstanding edges 28.
- the half-shell 5 can also be formed in one piece.
- FIG. 7 shows a perspective view of part of the half-shell 5 of the clamping mold 1 with the inner bags 21 and 22 inserted into the interiors 19 and 20 of the hollow body 15.
- the open ends of the two inner bags 21 and 22 are connected to the outside through a Y-shaped connection 36 guided.
- the connection 36 consists of an inlet pipe 35 which branches into two outlet pipes 37 and 38 (see FIG. 8).
- the tubes 35, 37 and 38 all have the same diameter.
- FIG. 9 shows a variant of the Y-shaped connection 36, an additional cranked pipe 41 being provided, which serves as a connection for the vacuum pump. Details will follow later.
- the table top 3 and the half-shell 5 of the clamping mold 1 are treated with a suitable release agent and then covered with cover layers made of synthetic resin-impregnated cloths.
- cover layers made of synthetic resin-impregnated cloths.
- These cloths can consist of carbon, glass and / or Kevlar fabrics soaked with epoxy resins, which are permeable to air, have a certain orientation of the fibers and are referred to in professional circles as "prepregs".
- the prepregs are cut according to a predetermined pattern These prepregs are normally sticky due to the impregnated resins and can therefore be attached to the clamping mold 1 become.
- the honeycomb structures 16 and 17, which have been cut to the shape of the clamping mold 1, are then placed on the cover layers.
- Suitable as a honeycomb structure are, for example, an aramid paper honeycomb, as sold by Hexcel Corporation, USA under the name "Nomex”, or also honeycombs made of aluminum or heat-resistant foam.
- the inner cover layers 45 and 47 and attached to the inner walls of the honeycomb structures 16 and 17, thereby creating a so-called sandwich structure.
- the longitudinal spar 18 is also laterally covered with the cover layers 46. All cover layers or prepregs are fitted precisely with respect to the honeycomb structure. shaped structure 16 and 17 cut, with the exception of the outer cover layer 44, which is provided in excess of the structure 16.
- the inner cover layers 44, 46 and 47 can be butted exactly against one another and the outer cover layer 44 can be moved with its edges over the outer - tack overlap overlap 47.
- Sta Reinforcement 23 of the longitudinal spar 18 are provided, as shown in FIGS. 3 and 4, on the end surface, the foot strap attachment, the mast and fin box.
- the honeycomb structure 18 is filled with a thermoplastic in these areas in order to increase the compressive strength.
- a cutout for the Y-shaped connection 36 is also provided in the rear area of the surfboard.
- the threaded sleeves of the foot strap attachment - not shown here - are also glued to the prepregs. Before the upper part 16 is joined to the lower part 17, the inner bags 21 and 22 are still to be attached.
- a sheet is cut from a heat-resistant plastic film such as a PTFE film or from a plastic film that only melts at high temperatures, such as a polypropylene film, which is a few cm wider than the largest inner diameter of the cavity and approximately 50 to 80 cm is longer than the total length of the surfboard.
- An inner sack is then produced from this web, which has a larger volume than that of the interior of the hollow body.
- the free ends of the inner bags 21 and 22 thus formed are then connected in an airtight manner to the Y-shaped connection 36 by means of hose clips or the like and inflated with compressed air. Either the inner bags 21 and 22 can be attached directly to the sticky upper parts 16 and 17 or a contact adhesive is still required in places.
- the lower part 17 is then placed on the upper part 16, so that the inner bags 21 and 22 also lie in the corners of the cavity 19 and 20.
- the outer prepreg 44 of the upper part 16 is now overlapped to the outer prepreg 47 of the lower part 17.
- This entire shape is now placed on the table top 3 of the clamping mold 1 and then the half-shell 5 is covered with an airtight cover 14 (PTFE film).
- This cover 14 is fixed gas-tight on the table frame 2 with the screw clamps 26 and L-profiles. So that the cover 14 does not tear during the subsequent heat treatment, beads are formed in the longitudinal direction and in the width so that the thermal expansion of the inserts Spannform 1 can be compensated.
- the Y-shaped connection 35 is pushed through the cover 14 and sealed gas-tight by means of a suitable seal such as a hose bride or the like. This ensures that the same pressure prevails inside and outside the hollow body to be produced. Furthermore, a manometer is connected to the space between the cover 14 and the inner bags 21 and 22 to check the vacuum.
- the upper and lower heaters 6 and 7 can be switched on and heated from about 20 ° C to 150 ° C for half an hour to allow the prepregs to cure at 150 ° C and at atmospheric pressure for about an hour to an hour and a half.
- a closed and one-piece hollow body such as the above surfboard 15 can thus be produced in one operation, which has the necessary stability and compressive strength in the edge areas.
- the vacuum in the gap is maintained throughout the heating process.
- the inner bags 21 and 22 consist of a plastic film that melts above a certain temperature of, for example, 160 ° C. to 170 ° C., as is the case with polypropylene, it can last for a short time during about 5 to 10
- a temperature of 170 ° C can be set so that the inner bags 21 and 22 connect to the inner walls of the hollow body.
- the carbon, glass and / or Kevlar fabrics can also be coated immediately beforehand with a two-component resin, which must then be processed immediately, since in this case curing begins at room temperature.
- the pressures inside and outside the hollow body must also be balanced in order to obtain an even pressure distribution in the surfboard.
- an autoclave can also be used for curing the molded hollow body.
- the prepregs can thus also be cured with an excess pressure of up to 5 atm, which leads to increased strength of the hollow body 15. This may be necessary for certain extreme applications.
- the gas-tight cover 14 is dispensed with and a Y-shaped connection 39 is used, as shown in FIG. 10.
- the seams between the half-shell 5 and the table top 3 must be sealed gas-tight, for example with molded silicone.
- the tubular bag ends of the inner bags 21 and 22 are guided outwards through one of the tubular connections 42 or 43.
- the vacuum pump (not shown) is connected to the cranked tube 41 via a vacuum line. In this way, a vacuum is also generated in the space between the inner bags 21 and 22 and the half-shell 5.
- the pressure equalization inside and outside the hollow body or the surfboard 15 can also be generated in a different way by using two compressors with which the same pressure is maintained inside and outside.
- the inner bags 21 and For this purpose, 22 can be formed, for example, as hoses without end closures, which with the outer cover 14 enclose the hollow body to be produced.
- the ends of the tubular inner bags 21 and 22 are to be welded to the ends of the tubular cover, so that the sandwich structure is completely enclosed.
- the manufacturing process is also identical to that described above.
- a mold can also be produced from just a single or a plurality of synthetic resin-impregnated tissue towels, one on top of the other, and a further supporting structure such as the honeycomb structure described above can be dispensed with.
- Shell parts for light vehicles such as interconnected bicycles or the like can thus be produced, which nevertheless have sufficient stability.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98907798A EP1015235A1 (de) | 1997-03-24 | 1998-03-23 | Verfahren und vorrichtung zur herstellung von surfbrettern |
AU66063/98A AU6606398A (en) | 1997-03-24 | 1998-03-23 | Methods and device for producing surf boards |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH699/97 | 1997-03-24 | ||
CH69997 | 1997-03-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998042496A1 true WO1998042496A1 (de) | 1998-10-01 |
Family
ID=4193111
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CH1998/000111 WO1998042496A1 (de) | 1997-03-24 | 1998-03-23 | Verfahren und vorrichtung zur herstellung von surfbrettern |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1015235A1 (de) |
AU (1) | AU6606398A (de) |
WO (1) | WO1998042496A1 (de) |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2170798A1 (en) * | 1972-02-01 | 1973-09-21 | Socea | Hollow reinforced resin mouldings - made by a double vacuum bag technique |
US3967996A (en) * | 1973-05-14 | 1976-07-06 | Nikolai Ilich Kamov | Method of manufacture of hollow pieces |
US4647326A (en) * | 1982-12-17 | 1987-03-03 | Aerotex Hochleistungsfaser Gmbh | Method of manufacturing a shape from a composite material |
DE3612864A1 (de) * | 1986-04-16 | 1987-10-22 | Man Technologie Gmbh | Verfahren zum herstellen von faserverbundkoerpern |
US4824631A (en) * | 1987-05-28 | 1989-04-25 | The Boeing Company | Method of manufacturing a contoured elastomeric pad |
EP0389456A2 (de) * | 1989-03-20 | 1990-09-26 | Divinycell International Ab | Verfahren zum Herstellen von Kunststoff-Bootsrümpfen mit Sandwichaufbau |
US5023042A (en) * | 1989-06-29 | 1991-06-11 | Gary Efferding | Flexible mold for making seamless sailboards |
US5266249A (en) * | 1992-01-02 | 1993-11-30 | Fusion Composites, Inc. | Method of forming a fiber reinforced plastic structure |
US5468331A (en) * | 1993-06-08 | 1995-11-21 | General Electric Company | Apparatus for making a bonded laminated article bend portion |
-
1998
- 1998-03-23 WO PCT/CH1998/000111 patent/WO1998042496A1/de not_active Application Discontinuation
- 1998-03-23 EP EP98907798A patent/EP1015235A1/de not_active Withdrawn
- 1998-03-23 AU AU66063/98A patent/AU6606398A/en not_active Abandoned
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2170798A1 (en) * | 1972-02-01 | 1973-09-21 | Socea | Hollow reinforced resin mouldings - made by a double vacuum bag technique |
US3967996A (en) * | 1973-05-14 | 1976-07-06 | Nikolai Ilich Kamov | Method of manufacture of hollow pieces |
US4647326A (en) * | 1982-12-17 | 1987-03-03 | Aerotex Hochleistungsfaser Gmbh | Method of manufacturing a shape from a composite material |
DE3612864A1 (de) * | 1986-04-16 | 1987-10-22 | Man Technologie Gmbh | Verfahren zum herstellen von faserverbundkoerpern |
US4824631A (en) * | 1987-05-28 | 1989-04-25 | The Boeing Company | Method of manufacturing a contoured elastomeric pad |
EP0389456A2 (de) * | 1989-03-20 | 1990-09-26 | Divinycell International Ab | Verfahren zum Herstellen von Kunststoff-Bootsrümpfen mit Sandwichaufbau |
US5023042A (en) * | 1989-06-29 | 1991-06-11 | Gary Efferding | Flexible mold for making seamless sailboards |
US5266249A (en) * | 1992-01-02 | 1993-11-30 | Fusion Composites, Inc. | Method of forming a fiber reinforced plastic structure |
US5468331A (en) * | 1993-06-08 | 1995-11-21 | General Electric Company | Apparatus for making a bonded laminated article bend portion |
Also Published As
Publication number | Publication date |
---|---|
AU6606398A (en) | 1998-10-20 |
EP1015235A1 (de) | 2000-07-05 |
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