WO2016189354A1 - Bamboo carbon fibre composite pipe structure primarily for bicycle frames and its production procedure - Google Patents

Bamboo carbon fibre composite pipe structure primarily for bicycle frames and its production procedure Download PDF

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Publication number
WO2016189354A1
WO2016189354A1 PCT/IB2015/053965 IB2015053965W WO2016189354A1 WO 2016189354 A1 WO2016189354 A1 WO 2016189354A1 IB 2015053965 W IB2015053965 W IB 2015053965W WO 2016189354 A1 WO2016189354 A1 WO 2016189354A1
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WO
WIPO (PCT)
Prior art keywords
layer
carbon fibre
cover
bamboo
resin
Prior art date
Application number
PCT/IB2015/053965
Other languages
French (fr)
Inventor
Tamas Horvath
Original Assignee
Tamas Horvath
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tamas Horvath filed Critical Tamas Horvath
Priority to PCT/IB2015/053965 priority Critical patent/WO2016189354A1/en
Publication of WO2016189354A1 publication Critical patent/WO2016189354A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
    • B32B9/02—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising animal or vegetable substances, e.g. cork, bamboo, starch
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00—Layered products having a non-planar shape
    • B32B1/08—Tubular products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
    • B32B9/04—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B9/047—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material made of fibres or filaments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
    • B62K19/00—Cycle frames
    • B62K19/02—Cycle frames characterised by material or cross-section of frame members
    • B62K19/14—Cycle frames characterised by material or cross-section of frame members the material being wholly or mainly wood
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/26—Polymeric coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/04—Cellulosic plastic fibres, e.g. rayon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/06—Vegetal fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/106—Carbon fibres, e.g. graphite fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/54—Yield strength; Tensile strength
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/546—Flexural strength; Flexion stiffness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/56—Damping, energy absorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/718—Weight, e.g. weight per square meter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2597/00—Tubular articles, e.g. hoses, pipes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2605/00—Vehicles

Definitions

  • the subject of the invention is a bamboo carbon fibre composite pipe primarily for bicycle fames.
  • the subject of the invention also includes its production procedure.
  • the state of the art includes the following solutions.
  • Chinese patent document No. CN102392535 B describes a bamboo reinforced with carbon fibres, which material has excellent characteristics, bending strength, and oppressive strength.
  • the devices is made of a special kind of dried bamboo and is used as a supplementing tool to the construction and reinforcement of the holding frame, for the primary purpose of supplementing the steel frame. It cannot be made of thin plywood, but must be made of the plant itself.
  • Chinese publication document No. CN103659989 A describes a procedure for the manufacturing of environmentally friendly bicycle frames made of bamboo.
  • the procedure consists of 5 steps.
  • the frame may be made of bamboo plywood.
  • the mentioned materials are used to achieve energy efficiency, more strength, and easy weight.
  • the device does not include carbon fibre or resin.
  • the solution described by international patent document No. WO2013157771 Al is a bamboo bicycle frame reinforced with carbon fibres.
  • the bamboo pipes are made of laminated plates by gluing.
  • Chinese utility model No. CN201189926 Y describes a safe, easy, practical, and environmentally friendly bicycle with a frame made of bamboo.
  • the frame of the bicycle is reinforced with carbon fibre and resin-based glue.
  • the used bamboo is applied in its natural form.
  • Another disadvantage is that a solution relying on the use of the bamboo plant itself will require high quality plants in sufficient - very large - quantities.
  • the purpose of the invention is to eliminate the disadvantages of known solutions and to implement a structure and production procedure that exploits the advantageous characteristics of bamboo plants and enables serial production, and is an easy yet strong and stable structure, which can be primarily used for bicycle frames.
  • the inventive step is based on the recognition that it is advantageous to produce bamboo carbon fibre composite pipes using the material composition described in claim 1 and the production procedure described in the main procedural claim. This recognition enables the serial production of a strong and stable bamboo-based pipe structure with high precision, which is also easy and environmentally conscious.
  • the solution in general is a bamboo carbon fibre composite pipe structure, primarily for bicycle frames.
  • a distinctive feature of the invention is that it has a bamboo plywood layer and a carbon fibre layer, and the bamboo plywood layer and the carbon fibre layer is fixed to each other with epoxy resin, polyester resin, or polyurethane resin.
  • Another implementation form may be where the surface of the bamboo plywood layer is coated with a cellulose layer to prevent fractures.
  • Another implementation form may be where the thickness of the bamboo plywood layer is between 0.1 and 5 mm, typically between 0.5 and 1.5 mm.
  • weight of the carbon fibre layer is between 80 and 300 g/m 2 , but preferably between 100 and 200 g/m 2 .
  • a distinctive feature of the general production procedure is that the bamboo plywood layer and the carbon fibre layer is fixed to each other with epoxy resin, polyester resin, or polyurethane resin, and then they are rolled onto a hose roll or other inflatable roll-shaped tool, and then they are placed into a cover, and, in the next step, the hose roll or the other inflatable roll-shaped tool is pumped up with oil, thereby it is pressurized from the inside, and then the cover is removed after the resin solidified.
  • bamboo plywood layer may be covered in a cellulose layer in advance.
  • cover removal tool is placed onto the rolled layers before they are placed into the cover, which cover removal tool is preferably a silicone tube or plastic insert.
  • Another distinctive feature may be that a heated metal template is used as cover.
  • the solidification of the resin is accelerated by heating after placement into the cover, and heat is preferably provided through the cover, by heating the oil, or by applying heat treatment after the removal of the cover.
  • Figure 1 shows an axonometric drawing of the structural layers
  • Figure 2 shows an axonometric drawing of the production of the pipe.
  • FIG. 1 shows that the carbon fibre layer 2 is placed onto the bamboo plywood layer 1.
  • the bamboo plywood layer 1 is covered in advance with a cellulose layer to prevent fractures, and then it is treated with epoxy resin, polyester resin, or polyurethane resin.
  • the application of the cellulose layer is not a necessary step of the procedure and may be omitted.
  • the carbon fibre layer 2 is placed onto the bamboo plywood layer 1 at an earlier stage.
  • the base material of the bamboo plywood layer 1 is a 0.1 to 5 mm, preferably 0.7 mm thick layer, and the base material of the carbon fibre layer is canvas, twill, or other fabric the weight of which is between 80 and 300 g/m 2 , preferably 100 and 200 g/m 2 , depending on the desired strength of the composite material. From among the above-mentioned resins, epoxy resin should be used primarily due to its strength.
  • Figure 2 shows a situation when the composite material consisting of a bamboo plywood layer 1 and a carbon fibre layer 2, fixed to each other with resin, is rolled onto the hose roll 3. This process is part of the production procedure used for producing the pipe structure used primarily for bicycle frames. Other similarly shaped inflatable tools may also be used instead of the hose roll 3.
  • the bamboo plywood layer 1 is covered with an epoxy resin, polyester resin, or polyurethane resin layer, according to the desired result.
  • the base material of the bamboo plywood layer 1 is a 0.1 to 5 mm, preferably 0.7 mm thick layer, which is preferably covered in advance with a cellulose layer to prevent fractures.
  • the resin types a slightly flexible type of epoxy resin should be preferred.
  • the carbon fibre layer 2 is placed onto the bamboo plywood layer 1.
  • the resulting layered material is then rolled onto the hose roll 3 or other similarly shaped inflatable tool.
  • a cover removal tool such as a plastic insert of a silicone tube, is placed onto the external side of the layers, so that the structure could be removed from the cover after the solidification of the resin easily and without damages. Then, it is placed into a metal casing or other suitable cover, dismountable shape or template, preferably a dismountable and heated metal template.
  • the hose roll 3 or the other tool used in its place is inflated, filled with oil, so that high pressure, preferably between 50 and 200 bars, is achieved. The pressure achieved this way is much higher than the pressure that could be achieved by filling up the hose roll 3 with air, making the resulting structure more dense and higher quality.
  • Heat treatment is used to solidify the resin and to achieve cross-bonding, which heat treatment may be applied either retrospectively or during the time when the structure is placed into the metal casing. If the heat treatment is not applied retrospectively, then it can be applied by using a heated cover or by heating the oil itself. The metal cover is removed after the resin becomes solid.
  • An advantage of the invention is that it can be used to produce easy bicycle frames, so that the weight of the bicycle remains small, which is important both for day-to-day and competitive use. Due to the characteristics of the bamboo material, the structure has good bending strength and oppressive strength. The structure is also very strong, can absorb vibrations with high efficiency, and, due to the procedure, is also very resistant.
  • the composite material according to the invention can be used to produce other devices as well, where strength and small weight are both important.
  • the structure is primarily used for bicycle frames, but it can be suitable for any other use where, in addition to the above-mentioned mechanical characteristics, the appealing appearance of the bamboo is required or advantageous.
  • it can be used as the framework of temporary constructions, such as pavilions and tents, where high on-site construction speed is expected and the light structure is advantageous.
  • It can be also used as the material of supporting structures and ladders, or it can be used to build other modules, jungle gyms, or custom-built pieces of furniture.
  • One of the most important advantages is that we can implement a structure that is suitable for industrial production, while retaining the advantageous characteristics of bamboo plants.
  • the carbon fibre can be pasted onto the bamboo plywood in advance, in which case there is no need for a cellulose layer.
  • the heat treatment can be omitted, if the structure is heated when it is placed into the metal casing, for example by the heated cover (i.e. the metal casing), or by heating the oil itself.
  • the invention does not waste any bamboo, since the massive structure can be implemented using bamboo plywood plates that are only a few times thicker than the tenth of a millimeter. It is advantageous that the resin can become solid in just a couple of minutes, so that the procedure can be accelerated.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Ceramic Engineering (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention is a bamboo carbon fibre composite pipe primarily for bicycle frames. It is characterized in that it has a bamboo plywood layer (1 ) and a carbon fibre layer (2), and the bamboo plywood layer (1 ) and the carbon fibre layer (2) is fixed to each other with epoxy resin, polyester resin, or polyurethane resin. The invention also includes the procedure for the production of the bamboo carbon fibre composite pipe.

Description

Bamboo carbon fibre composite pipe structure primarily for bicycle frames and its production procedure
The subject of the invention is a bamboo carbon fibre composite pipe primarily for bicycle fames. The subject of the invention also includes its production procedure.
The state of the art includes the following solutions.
Chinese patent document No. CN102392535 B describes a bamboo reinforced with carbon fibres, which material has excellent characteristics, bending strength, and oppressive strength. The devices is made of a special kind of dried bamboo and is used as a supplementing tool to the construction and reinforcement of the holding frame, for the primary purpose of supplementing the steel frame. It cannot be made of thin plywood, but must be made of the plant itself.
Chinese publication document No. CN103659989 A describes a procedure for the manufacturing of environmentally friendly bicycle frames made of bamboo. The procedure consists of 5 steps. The frame may be made of bamboo plywood. The mentioned materials are used to achieve energy efficiency, more strength, and easy weight. The device does not include carbon fibre or resin.
International publication document No. WO2012037748 Al describes a procedure for manufacturing environmentally friend bicycle frames made of bamboo.
The solution described by international patent document No. WO2013157771 Al is a bamboo bicycle frame reinforced with carbon fibres. The bamboo pipes are made of laminated plates by gluing.
Chinese utility model No. CN201189926 Y describes a safe, easy, practical, and environmentally friendly bicycle with a frame made of bamboo. The frame of the bicycle is reinforced with carbon fibre and resin-based glue. The used bamboo is applied in its natural form.
The description of several home-made bicycle solutions with bamboo frame is available online. These solutions use bamboo primarily for environmental considerations. Bamboo is used in its natural form, only its surface is treated to protect against fractures. These solutions have numerous disadvantages that are mostly due to home-production. They are made at home, meaning that the manufacturing is imprecise, slow, and costly. These procedures cannot be automated are unsuitable for industrial production. The structure of the bamboo remains unaltered in the course of assembling the frame, meaning that the diameter of the bicycle frame tube remains the same as that of the used bamboo. The manufacturing of carbon bicycle frames is entirely different structurally, but it may use similar procedures. However, they are made by using air-filled hose rolls, which method involves numerous disadvantages. In optimal cases, approximately 40 bar pressure may be achieved by air pumps, which is not enough to produce the structure at the expected quality level. However, the procedure becomes rather dangerous if even higher pressure is to be achieved by air compression.
Another disadvantage is that a solution relying on the use of the bamboo plant itself will require high quality plants in sufficient - very large - quantities.
The purpose of the invention is to eliminate the disadvantages of known solutions and to implement a structure and production procedure that exploits the advantageous characteristics of bamboo plants and enables serial production, and is an easy yet strong and stable structure, which can be primarily used for bicycle frames.
The inventive step is based on the recognition that it is advantageous to produce bamboo carbon fibre composite pipes using the material composition described in claim 1 and the production procedure described in the main procedural claim. This recognition enables the serial production of a strong and stable bamboo-based pipe structure with high precision, which is also easy and environmentally conscious.
According to the desired goal, the most general implementation form of the solution according to the invention is described in claim 1. The most general form of the production procedure is described in the main procedural claim. The various implementation forms are described in the sub-claims.
The solution in general is a bamboo carbon fibre composite pipe structure, primarily for bicycle frames.
A distinctive feature of the invention is that it has a bamboo plywood layer and a carbon fibre layer, and the bamboo plywood layer and the carbon fibre layer is fixed to each other with epoxy resin, polyester resin, or polyurethane resin. Another implementation form may be where the surface of the bamboo plywood layer is coated with a cellulose layer to prevent fractures.
Another implementation form may be where the thickness of the bamboo plywood layer is between 0.1 and 5 mm, typically between 0.5 and 1.5 mm.
Yet another implementation form may be where the weight of the carbon fibre layer is between 80 and 300 g/m2, but preferably between 100 and 200 g/m2.
A distinctive feature of the general production procedure is that the bamboo plywood layer and the carbon fibre layer is fixed to each other with epoxy resin, polyester resin, or polyurethane resin, and then they are rolled onto a hose roll or other inflatable roll-shaped tool, and then they are placed into a cover, and, in the next step, the hose roll or the other inflatable roll-shaped tool is pumped up with oil, thereby it is pressurized from the inside, and then the cover is removed after the resin solidified.
Another possible distinctive feature of the procedure is that the bamboo plywood layer may be covered in a cellulose layer in advance.
Another implementation solution is that a cover removal tool is placed onto the rolled layers before they are placed into the cover, which cover removal tool is preferably a silicone tube or plastic insert.
Another distinctive feature may be that a heated metal template is used as cover.
Yet another distinctive feature is that the solidification of the resin is accelerated by heating after placement into the cover, and heat is preferably provided through the cover, by heating the oil, or by applying heat treatment after the removal of the cover.
The invention is presented in more detail on drawings pertaining to the various implementation forms.
On the attached drawings,
Figure 1 shows an axonometric drawing of the structural layers, and
Figure 2 shows an axonometric drawing of the production of the pipe.
Figure 1 shows that the carbon fibre layer 2 is placed onto the bamboo plywood layer 1. The bamboo plywood layer 1 is covered in advance with a cellulose layer to prevent fractures, and then it is treated with epoxy resin, polyester resin, or polyurethane resin. The application of the cellulose layer is not a necessary step of the procedure and may be omitted. In this case, the carbon fibre layer 2 is placed onto the bamboo plywood layer 1 at an earlier stage. The base material of the bamboo plywood layer 1 is a 0.1 to 5 mm, preferably 0.7 mm thick layer, and the base material of the carbon fibre layer is canvas, twill, or other fabric the weight of which is between 80 and 300 g/m2, preferably 100 and 200 g/m2, depending on the desired strength of the composite material. From among the above-mentioned resins, epoxy resin should be used primarily due to its strength.
Figure 2 shows a situation when the composite material consisting of a bamboo plywood layer 1 and a carbon fibre layer 2, fixed to each other with resin, is rolled onto the hose roll 3. This process is part of the production procedure used for producing the pipe structure used primarily for bicycle frames. Other similarly shaped inflatable tools may also be used instead of the hose roll 3.
During the production of the invention, the bamboo plywood layer 1 is covered with an epoxy resin, polyester resin, or polyurethane resin layer, according to the desired result. The base material of the bamboo plywood layer 1 is a 0.1 to 5 mm, preferably 0.7 mm thick layer, which is preferably covered in advance with a cellulose layer to prevent fractures. As for the resin types, a slightly flexible type of epoxy resin should be preferred. Then, or in the previous step instead of the cellulose layer, the carbon fibre layer 2 is placed onto the bamboo plywood layer 1. The resulting layered material is then rolled onto the hose roll 3 or other similarly shaped inflatable tool. A cover removal tool, such as a plastic insert of a silicone tube, is placed onto the external side of the layers, so that the structure could be removed from the cover after the solidification of the resin easily and without damages. Then, it is placed into a metal casing or other suitable cover, dismountable shape or template, preferably a dismountable and heated metal template. In the next step, the hose roll 3 or the other tool used in its place is inflated, filled with oil, so that high pressure, preferably between 50 and 200 bars, is achieved. The pressure achieved this way is much higher than the pressure that could be achieved by filling up the hose roll 3 with air, making the resulting structure more dense and higher quality. Heat treatment is used to solidify the resin and to achieve cross-bonding, which heat treatment may be applied either retrospectively or during the time when the structure is placed into the metal casing. If the heat treatment is not applied retrospectively, then it can be applied by using a heated cover or by heating the oil itself. The metal cover is removed after the resin becomes solid. The presented structure has numerous advantages. An advantage of the invention is that it can be used to produce easy bicycle frames, so that the weight of the bicycle remains small, which is important both for day-to-day and competitive use. Due to the characteristics of the bamboo material, the structure has good bending strength and oppressive strength. The structure is also very strong, can absorb vibrations with high efficiency, and, due to the procedure, is also very resistant. The composite material according to the invention can be used to produce other devices as well, where strength and small weight are both important. The structure is primarily used for bicycle frames, but it can be suitable for any other use where, in addition to the above-mentioned mechanical characteristics, the appealing appearance of the bamboo is required or advantageous. For example, it can be used as the framework of temporary constructions, such as pavilions and tents, where high on-site construction speed is expected and the light structure is advantageous. It can be also used as the material of supporting structures and ladders, or it can be used to build other modules, jungle gyms, or custom-built pieces of furniture. One of the most important advantages is that we can implement a structure that is suitable for industrial production, while retaining the advantageous characteristics of bamboo plants. Another advantage is that, due to the use of oil, a sufficiently high pressure can be achieved that results in high quality and dense structures. Another advantage is that the described composite material and procedural steps are suitable for industrial application. It is also an advantage that polyester resin or polyurethane resin can be also used in place of epoxy resin. The removal of the template can be facilitated by various means, including the use of a silicone tube, a suitable plastic insert, or plastic chops. This is necessary to prevent the possibly overflowing resin from damaging the structure or making the pipe structure stuck into the shape. There is also significant freedom in selecting the carbon fibre to be used; the fineness, texture, and weight should be determined according to the desired strength of the composite material. It is also advantageous that the carbon fibre can be pasted onto the bamboo plywood in advance, in which case there is no need for a cellulose layer. It is also advantageous that the heat treatment can be omitted, if the structure is heated when it is placed into the metal casing, for example by the heated cover (i.e. the metal casing), or by heating the oil itself. The invention does not waste any bamboo, since the massive structure can be implemented using bamboo plywood plates that are only a few times thicker than the tenth of a millimeter. It is advantageous that the resin can become solid in just a couple of minutes, so that the procedure can be accelerated.
In addition to the above examples, the invention can be implemented in other forms and with other production procedures within the scope of protection.

Claims

1. Bamboo carbon fibre composite pipe primarily for bicycle frames, characterized in that it has a bamboo plywood layer (1) and a carbon fibre layer (2), and the bamboo plywood layer (1) and the carbon fibre layer (2) is fixed to each other with epoxy resin, polyester resin, or polyurethane resin.
2. The structure according to claim 1, characterized in that the surface of the bamboo plywood layer (1) is covered with a cellulose layer to prevent fractures.
3. The structure according to any one of claims 1 to 2, characterized in that the bamboo plywood layer (1) is 0.1 to 5 mm, typically 0.5 to 1.5 mm thick.
4. The structure according to any one of claims 1 to 3, characterized in that the weight of the carbon fibre layer (2) is 80 to 300 g/m2, preferably 100 to 200 g/m2.
5. Procedure for the production of the pipe structure according to claim 1, characterized in that the bamboo plywood layer (1) and the carbon fibre layer (2) is fixed to each other with epoxy resin, polyester resin, or polyurethane resin, and then it is rolled onto the hose roll (3) or other inflatable roll-shaped tool, and, in the next step, the hose roll (3) or the other inflatable roll-shaped tool is filled with oil, thereby it is pressurized from the inside, and then the cover is removed after the resin solidified.
6. The procedure according to claim 5, characterized in that the bamboo plywood layer (1) is covered in a cellulose layer in advance.
7. The procedure according to any one of claims 5 and 6, characterized in that a cover removal tool is placed onto the rolled layers before they are placed into the cover, which cover removal tool is preferably a silicone tube or plastic insert.
8. The procedure according to any one of claims 5 to 7, characterized in that a heated metal template is used as cover.
9. The procedure according to any one of claims 5 to 8, characterized in that a the solidification of the resin is accelerated by heating after placement into the cover, and heat is preferably provided through the cover, by heating the oil, or by applying heat treatment after the removal of the cover.
PCT/IB2015/053965 2015-05-27 2015-05-27 Bamboo carbon fibre composite pipe structure primarily for bicycle frames and its production procedure WO2016189354A1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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US6168179B1 (en) * 1999-04-27 2001-01-02 Kuo-Pin Yu Bicycle frame assembly having wooden appearance and enhanced mechanical properties
GB2368323A (en) * 2000-10-25 2002-05-01 Yu Kuo Pin Footboard of scooter
CN201189926Y (en) 2007-08-31 2009-02-04 王文栋 Bamboo bicycle rack
WO2012037748A1 (en) 2010-09-21 2012-03-29 Hu Jun Manufacture method of bicycle pipe frame components made of bamboo
CN102392535B (en) 2011-08-02 2013-08-07 上海交通大学 Preparation method of carbon fiber-reinforced moso bamboo serving as secondary structure of steel structure
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CN107053368A (en) * 2017-05-17 2017-08-18 安徽省舒城华竹实业有限公司 A kind of bamboo plywood with high strength

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