EP4139123A1 - Versteiftes dachpanel für wohnmobile und kühl-lkw - Google Patents
Versteiftes dachpanel für wohnmobile und kühl-lkwInfo
- Publication number
- EP4139123A1 EP4139123A1 EP21717481.2A EP21717481A EP4139123A1 EP 4139123 A1 EP4139123 A1 EP 4139123A1 EP 21717481 A EP21717481 A EP 21717481A EP 4139123 A1 EP4139123 A1 EP 4139123A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- flat
- composite material
- fiber
- reinforced plastic
- flat composite
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
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- B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
- B32B21/04—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B21/08—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- B32B3/08—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by added members at particular parts
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- B62D29/043—Superstructures
- B62D29/045—Van bodies composed of substantially rectangular panels
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- B62D—MOTOR VEHICLES; TRAILERS
- B62D33/00—Superstructures for load-carrying vehicles
- B62D33/04—Enclosed load compartments ; Frameworks for movable panels, tarpaulins or side curtains
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Definitions
- the present invention relates to a flat composite material with a base made of a flat porous rigid material and one or more elongated elements of a fiber-reinforced plastic material for stiffening the base material.
- the thickness of the elongated elements made of the fiber-reinforced plastic material is less than that of the flat, porous rigid material.
- the present invention further relates to sandwich panels containing such a composite material and methods for producing such composite materials and sandwich panels, as well as the use of elongated elements made of fiber-reinforced plastic material for reinforcing corresponding sandwich panels.
- Sandwich panels or panels for installation in roof or side wall applications for e.g. caravans or refrigerated superstructures of trucks or vans are normally not significantly stiffened.
- Such sandwich panels usually have a core made of an insulating material (e.g. a polyurethane foam), which is surrounded on both sides by a respective cover layer.
- cover layers can be made from materials such as glass fiber reinforced polyester-based plastics, but also from metals such as aluminum, whereby polymer-based materials are used in vehicle applications because of their lower weight, easier repairability and better corrosion resistance (e.g. against road salt ) are preferred.
- steel reinforcements are built into the plates, which are embedded in the plates.
- these steel reinforcements consist of pipes that are also filled with rigid foam in order to avoid cold bridges between the inside and outside of a vehicle.
- Steel as a material has, in addition to unfavorable thermal conductivity properties, the disadvantage of a relatively high weight, which is disadvantageous in the context of constantly increasing requirements with regard to the fuel consumption of vehicles.
- Wood was proposed as a further possibility for stiffening and insulation, e.g. in the form of rods or panels that can be integrated into the panel construction.
- WO 2017/087623 A1 discloses a production method for a rigid polymer composite material which comprises the coating of a film or textile layer with fibers or minerals and optionally with a binder and subsequent compression under heat.
- DE 36 38 797 A1 discloses an air and impact sound insulation board made of foam plastic for floating screeds or floating floors made of wood, with specially arranged cavities being present in the board.
- the disclosed panels and have a low stiffness required for impact sound insulation in construction and also have good insulation and fire properties.
- stiffening means for corresponding sandwich panels which have a reduced weight compared to metal-based reinforcements, can be processed easily and can provide a comparable stiffening effect. Furthermore, the stiffening agent should, if possible, not form any thermal bridges.
- the present invention addresses this need.
- the present invention relates to a flat composite material which has a flat, porous rigid material as a base and one or more elongated elements of a fiber-reinforced plastic material.
- the elongated element made of fiber-reinforced plastic material has a thickness which is less than that of the laminar porous rigid material.
- “Flat” in the context of the present invention means that the dimensions of the material in at least one spatial direction (eg length or width) are significantly larger (ie by a factor of at least 5) than in the third spatial direction (eg thickness) one of the dimensions of the larger spatial directions by at least ten times, in particular at least fifty times and more preferably at least a hundred times larger than the dimension of the third (smaller) spatial direction.
- the "flat" composite material can therefore, for example, in the form of a plate in which the dimensions of the material in two spatial directions (e.g. length and width) are significantly larger than in the third spatial direction, or in the form of an elongated carrier in which the dimensions of the material are significantly larger in only one spatial direction than in the third spatial direction.
- porous denotes the fact that the material has pores which are filled with a gas, preferably air.
- the (dry) density or the density of the porous material is usually less than 950 kg / m 3 , preferably less than 800 kg / m 3 and more preferably less than 700 kg / m 3.
- a sensible lower limit, for example to ensure favorable strength, can be a density of at least 100 kg / m 3 , and in particular at least 200 kg / m 3 and more preferably at least 300 kg / m 3 are given.
- the material is "rigid", ie inelastic, so that a plate with a thickness of 1 cm and a length and width of 20 cm cm can be bent.
- the flat, porous rigid material provides the essential volume fraction of the flat composite material, ie in particular a volume fraction of at least 80% by volume, preferably at least 90% by volume and more preferably at least 95% by volume. %.
- an “elongated element” denotes a material whose expansion in one spatial direction is significantly (i.e. preferably at least 5 times) greater than its own
- the expansion in the two smaller spatial directions is at least a factor of 2 and preferably at least differentiated by a factor of 3, so that, for example, the elongated element is at least twice or at least three times as wide as it is thick.
- This shape achieves, on the one hand, a maximum effect in terms of stiffening and, on the other hand, a minimal material weight.
- Suitable shapes of elongate elements are, for example, strips or lamellae or a cylindrical or hollow-cylindrical shape. A strip shape is particularly preferred in the context of the invention.
- the "hollow cylinder" can also be filled with another material, for example wood.
- the polymer matrix is mostly based on epoxy, vinyl ester or a thermoplastic polyester resin, but can also be made of another polymer material.
- the composite material can contain glass fibers or carbon fibers (also referred to as carbon fibers), but also fibers made of aramid or basalt, whereby glass and carbon fibers are preferred and carbon fibers are particularly preferred.
- Carbon fiber reinforced plastics are also known as CFRP or CFRP.
- the fibers and in particular the carbon fibers can be present as individual fibers, fiber bundles, or as woven carbon fiber materials.
- the fiber-reinforced plastic material itself can either be stiff and thus directly impart a stiffening effect, but it can also be flexible, e.g. rollable on rollers, in which case the stiffening effect is achieved through a firm connection to another material, such as the flat, rigid one in particular Material that can be conveyed.
- a particularly suitable carbon fiber reinforced plastic material for use in the present invention has a fiber volume content of more than 50% and preferably in the range from 55 to 80%.
- Such a carbon fiber-reinforced plastic material is sold, for example, by Sika under the trade names Sika ® Carbodur ® S or Sika ® Carbodur ® M.
- the elongated element (s) is / are made of fiber-reinforced plastic material by means of an adhesive with which flat porous rigid material connected, which forms the basis of the flat composite material.
- Suitable adhesives are in particular polyurethane adhesives, especially two-component polyurethane adhesives, epoxy adhesives, especially toughened epoxy adhesives, adhesives based on silane-terminated polymers (STP), especially 2K-STP adhesives, and also STP-epoxy hybrid adhesives.
- STP silane-terminated polymers
- An adhesive based on polyurethane, and in particular a 2K polyurethane adhesive, can be specified here as a preferred, suitable type of adhesive.
- 2K polyurethane adhesives which are particularly suitable for the present invention are disclosed, for example, in WO 2020/016003 A1 and WO 2019/002538 A1.
- a 2K epoxy adhesive particularly suitable for the present invention is disclosed, for example, in WO 2020/016372 A1.
- Adhesives particularly suitable in this context preferably have one or more properties selected from a tensile shear strength in the range from 5 to 30 N / mm 2 , preferably 10 to 20 N / mm 2 , a tensile strength in the range from 5 to 30 N / mm 2 , preferably 10 to 20 N / mm 2 , an elongation at break in the range from 60 to 200% and in particular 80 to 150% and a modulus of elasticity in the range 200 to 600 N / mm 2 and in particular 250 to 500 N / mm 2 .
- adhesive such as is available under the trade name SikaForce ® -840 Sika. Such adhesives are advantageous because they ensure good adhesion between the fiber-reinforced plastic material and the flat, porous rigid material, while tensions between the two materials, which can occur, for example, in an injection molding process, are avoided.
- the flat composite material can be produced by placing one or more elongated elements made of fiber-reinforced plastic material in a cavity, into which a material is then introduced by injection molding that a rigid foam forms around the fiber-reinforced plastic material. The injected material or injection molding material is then hardened to form a rigid foam. In this case, the rigid foam material is bonded to the fiber-reinforced plastic material as a result of the hardening process.
- one or more elongated elements made of fiber-reinforced plastic material are introduced into the flat, porous rigid material, e.g. by first inserting a corresponding bore into the porous rigid material, into which the elongated element can be inserted.
- the use of only a flexible, fiber-reinforced plastic material is less suitable for such an application, since the required connection with the flat, porous, rigid material can only be achieved with difficulty.
- the flat, porous rigid material can be any material that is used today to provide porous base materials for sandwich element panels or non-metallic stiffening supports for such panels.
- the flat, porous rigid material particularly preferably comprises or is based on a plastic foam, in particular on a polyurethane, polyvinyl chloride or polyethylene foam, or on wood.
- the flat, porous, rigid material very particularly preferably consists of one or more of these materials.
- the elongated elements and in particular the strips of the fiber-reinforced and preferably of the carbon-fiber-reinforced plastic material, which are included in the flat composite material expediently have a width in the range from about 20 to 100 mm, preferably from about 15 to 70 mm and even more preferably from about 30 to 50 mm.
- the elongated elements or strips of the fiber-reinforced plastic material have a thickness in the range of 0.8 to 3 mm and more preferably 1 to 1.5 mm.
- the spatial and, in particular, two-dimensional expansion of the elongated elements of the fiber-reinforced plastic material is generally less than that of the flat composite material. If the sheet-like composite material is a two-dimensional composite material such as a plate, it is preferred if the two-dimensional expansion of the elongated elements of the fiber-reinforced plastic material is in the range from 1 to 50%, preferably 2 to 30% and more preferably 5 to 15% of the two-dimensional expansion of the flat composite material lies.
- the two-dimensional expansion of the elongated elements of the fiber-reinforced plastic material is in the range of 20 to 90%, preferably 40 to 85% and even more preferably 50 up to 80% of the two-dimensional expansion of the flat composite material.
- the flat composite material according to the invention can expediently be further developed with one or more cover layers which are arranged on the top and / or underside of the flat composite material.
- This cover layer or layers are preferably compact, i.e. non-porous.
- a fiber-reinforced plastic, e.g. based on polyesters, or a metal, such as aluminum in particular, can be specified as a particularly suitable material for such cover layers.
- the flat composite material is modified with one or more cover layers, it is also possible that the elongated element (s) made of fiber-reinforced plastic material is / are connected to the cover layer, the connection being expediently realized with a corresponding adhesive can. If the elongated element made of fiber-reinforced plastic material is attached to the flat, porous rigid material on its upper or lower side, it can be useful if elongated elements and, in particular, strips of the material are attached to both the upper and lower sides of the material. With such a design, the flat composite material is stiffened against forces that act on the flat composite material from the top and bottom.
- the flat composite material is only stiffened against the action of forces that act on the composite material from one side, such as rainwater accumulations on a roof. Accordingly, in one embodiment, elongated elements of the fiber-reinforced plastic material can only be attached to one side of the flat composite material, preferably to its underside.
- elongated elements are fastened in one direction on the flat porous rigid material, or that elongated elements intersect, for example at an angle of about 60 ° or about 90 ° or, for example, are attached to the material in a checkerboard shape, in order to achieve stiffening not only in one, but in several spatial directions.
- the sheet-like composite material is the carrier with a length that is great compared to the thickness and width (which is preferably greater than 8 times, more preferably greater than 15 times and even more preferably greater than 25 times , the longer the thickness and width).
- a range of 15 to 60 mm and in particular 20 to 45 mm can be specified here as suitable dimensions for the thickness and width.
- the length of the carrier is preferably at least 500 mm and more preferably at least 1000 mm.
- the length of the beam is not limited, but for most applications a maximum length of 3000 mm is sufficient.
- a preferred carrier contains two elongated elements which are arranged spaced apart from one another in the carrier, ie for example on the top and Bottom or in the carrier with a distance to one side that is greater than the distance to the other side.
- the present invention relates to a sandwich panel which has an inner core layer and an upper and a lower cover layer which form the respective outer sides of the sandwich panel, the core layer containing one or more elements of the flat composite material described above.
- the composite material can, for example, be in the form of a plate which forms the inner core layer, or the composite material can be in the form of one or more supports which are arranged between the cover layers and do not completely fill the inner core layer.
- a sandwich panel preferred in the context of this invention contains one or more carriers in the core layer which are formed from the flat composite material according to the invention.
- the space of the core layer that is not filled by the composite material is preferably filled with an insulating material such as glass wool or a polymer foam.
- an insulating material such as glass wool or a polymer foam.
- the sandwich panel is a roof or a side wall of the vehicle, preferably a caravan, mobile home or refrigerated trailer.
- Another aspect of the present invention relates to a method for producing a flat composite material or a sandwich panel, each as described above, the method comprising a step of bringing a flat porous rigid material into contact with one or more elongated elements of a fiber-reinforced Plastic material, wherein the or the elongate (s) element (s) have a thickness which is less than that of the sheet-like porous rigid material comprises.
- Bringing into contact or contacting can, as described above, in particular by placing the elongated elements of the fiber-reinforced and preferably the carbon-fiber-reinforced plastic material in front of it and injecting a material that hardens to form a hard foam, by attaching the elongated elements of the fiber-reinforced plastic material to a rigid foam or other flat porous rigid material, in particular with the help of an adhesive, by introducing material that hardens to a fiber-reinforced plastic material in recesses in a flat porous rigid material, or by introducing an elongated element made of cured fiber-reinforced plastic material in recesses of a flat porous rigid material.
- Yet another aspect of the present invention finally relates to the use of elongated elements made of fiber-reinforced plastic material for reinforcing a sandwich panel with a core made of a flat, porous rigid material and upper and lower cover layers which form the respective outer sides of the sandwich panel.
- these two carrier Carbodur ® orbits are of a width of 20 mm so inserted that the trains are positioned at an end on the surface of the carrier (sh. Fig. 1).
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- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Laminated Bodies (AREA)
- Body Structure For Vehicles (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP20170852 | 2020-04-22 | ||
| PCT/EP2021/059824 WO2021213894A1 (de) | 2020-04-22 | 2021-04-15 | Versteiftes dachpanel für wohnmobile und kühl-lkw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4139123A1 true EP4139123A1 (de) | 2023-03-01 |
Family
ID=70417306
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21717481.2A Withdrawn EP4139123A1 (de) | 2020-04-22 | 2021-04-15 | Versteiftes dachpanel für wohnmobile und kühl-lkw |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US20230347628A1 (de) |
| EP (1) | EP4139123A1 (de) |
| WO (1) | WO2021213894A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3128934A1 (fr) * | 2021-11-05 | 2023-05-12 | Lecapitaine Industrie | Ensemble de carrosserie comportant au moins une paroi composite et véhicule utilitaire comprenant un tel ensemble de carrosserie |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050074593A1 (en) * | 2000-12-27 | 2005-04-07 | Webcore Technologies, Inc. | Fiber reinforced composite cores and panels |
| US20160193793A1 (en) * | 2015-01-06 | 2016-07-07 | Gear Box | Panel Structure with Foam Core and Methods of Manufacturing Articles Using the Panel Structure |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3638797A1 (de) | 1985-11-19 | 1987-05-21 | Marquet & Cie Noel | Luft- und trittschalldaemmplatte aus schaumkunststoff fuer schwimmende estriche oder schwimmende holzfussboeden |
| US5834082A (en) * | 1992-05-04 | 1998-11-10 | Webcore Technologies, Inc. | Reinforced foam cores and method and apparatus of production |
| US9005730B2 (en) | 2011-11-14 | 2015-04-14 | The Boeing Company | Aircraft interior panels and methods of panel fabrication |
| US9505470B1 (en) * | 2015-05-12 | 2016-11-29 | John Arthur Martens | Sports device structures and compositions |
| CN110625962B (zh) | 2015-11-17 | 2022-03-08 | 马尔哈吉尔有限责任公司 | 结构复合材料和方法 |
| US20170190394A1 (en) * | 2015-12-31 | 2017-07-06 | Kwong Kee Cheung | Break Resistant Composite Stringer System |
| US20180148141A1 (en) * | 2016-11-28 | 2018-05-31 | Rightfair Group, Ltd. | Sportsboard Stiffening System |
| WO2019002538A1 (de) | 2017-06-30 | 2019-01-03 | Sika Technology Ag | Zweikomponentige polyurethanzusammensetzung mit einstellbarer topfzeit |
| EP3597684A1 (de) | 2018-07-17 | 2020-01-22 | Sika Technology Ag | Struktureller polyurethanklebstoff mit guter haftung nach kurzzeitiger erwärmung |
| WO2020016372A1 (en) | 2018-07-18 | 2020-01-23 | Sika Technology Ag | Method for strengthening of metal structures using toughened 2c-epoxy adhesives |
-
2021
- 2021-04-15 EP EP21717481.2A patent/EP4139123A1/de not_active Withdrawn
- 2021-04-15 WO PCT/EP2021/059824 patent/WO2021213894A1/de not_active Ceased
- 2021-04-15 US US17/914,229 patent/US20230347628A1/en not_active Abandoned
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050074593A1 (en) * | 2000-12-27 | 2005-04-07 | Webcore Technologies, Inc. | Fiber reinforced composite cores and panels |
| US20160193793A1 (en) * | 2015-01-06 | 2016-07-07 | Gear Box | Panel Structure with Foam Core and Methods of Manufacturing Articles Using the Panel Structure |
Non-Patent Citations (1)
| Title |
|---|
| See also references of WO2021213894A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| US20230347628A1 (en) | 2023-11-02 |
| WO2021213894A1 (de) | 2021-10-28 |
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