EP2322713A1 - Method for producing bamboo fibres as well as plastics containing same - Google Patents

Abstract

The method involves dividing bamboo tubes transverse to a longitudinal axis into individual sectional elements. The sectional elements are separated into divided elements along the longitudinal axis. The divided elements are defibrated to fibers by pressurization. Bamboo fibers are dried, and the bamboo tubes and/or bamboo fibers are desugared. The bamboo fibers are binded to fleece, a pre-impregnated material, a foil, a web or a sheet molding compound. A mixed fleece comprising the bamboo fibers and plastic fibers is manufactured. Independent claims are also included for the following: (1) a method for manufacturing a fleece comprising bamboo fibers (2) a method for manufacturing a fiber-reinforced plastic, a plastic component or a semi-finished plastic (3) a component made of fiber-reinforced plastic.

Description

Fiber-reinforced plastics are used in the field of technology in many areas. Compared to other materials, they have high specific stiffness and strength at a low specific weight. These inherently contradictory properties are due to the fact that they consist of at least two components, namely a fiber component and a matrix component. The fibers of the fiber component have a high modulus of elasticity in the longitudinal direction and are therefore able to absorb strong tensile forces. The matrix component embeds and supports the fibers, protects them from kinking and other environmental influences, and moreover has a high breaking strength, so that it is able to absorb strong pressures and shear forces.

An intimate connection between the fiber and matrix components helps to ensure that tensile forces, pressures and shear forces are uniformly transferred to the entire material.

The fiber component is usually glass or carbon fibers. Occasionally, steel fibers or fibers of aramid, nylon or PE are used.

The matrix component is usually a thermoplastic, a thermoset or an elastomeric plastic. The latter are only occasionally used, for example with wedge or toothed belts. The former are particularly versatile and use processable, while the second-mentioned fiber-reinforced plastics with thermosetting matrix usually have the highest strengths.

Fiber-reinforced plastics have prevailed in all the areas of application where high tensile strength and breaking strength at low specific weight are required, for example in body construction, in aircraft construction, in shipbuilding, in civil engineering and in articles of everyday life.

Due to the intimate connection between the fiber and matrix components, which is indispensable for the above-mentioned positive properties, fiber-reinforced plastics can generally only be recycled poorly or not at all. For example, although fiber-reinforced thermosets can be melted down, this does not facilitate the separation into the matrix and the fiber component. A chemical extraction of the fibers usually prohibits for environmental as well as cost reasons. At most, such plastics can be ground and reused as extender. However, the latter are of inferior quality compared to the starting materials.

Fiber-reinforced thermoplastics may also be ground and reused as short-fiber reinforced plastics. However, reflowing substantially degrades the properties of the thermoplastic.

However, the mentioned limited recycling possibilities do not apply to glass-fiber reinforced plastics, which represent an overwhelmingly large proportion of the total amount of fiber-reinforced plastics, since they combine the abovementioned properties in terms of strength and specific gravity in an almost ideal manner. Moreover, they are very inexpensive to manufacture, especially in comparison to carbon fiber or aramid fiber reinforced plastics.

Since glass fibers do not burn, glass-fiber reinforced plastics can not be burned or only badly burned for disposal purposes. Nor can they be ground, since the glass fibers have a high surface hardness, which would damage the grinding tools to be used, especially for example extruder. In addition, when grinding glass fibers, microfibers are released which are highly damaging to health. For this reason, glass fiber reinforced plastics must not be recycled according to German legislation, but must be disposed of.

Since Directive 2000/53 / EC of the European Parliament requires EU Member States to take measures to ensure that by 01.01.2006 at least 85% of the average vehicle weight of end-of-life vehicles must be recycled, and by 01.01.2015 at the latest will be recycled to at least 95%, it is foreseeable in the medium term that glass fiber reinforced plastics in automotive engineering can no longer be used to a significant extent.

According to a study by the VDI, the weight fraction of plastics in the automotive industry has increased from 6% by weight to 15% by weight in the last 30 years, while the proportion of metal decreased by the same amount. The reason for this is that more and more metallic automotive components are replaced by plastic components for reasons of weight and corrosion. A large proportion of these plastics are glass-fiber reinforced plastics, whose share in the future due to the mentioned EU Directive must be reduced more and more.

Thus, there is clearly an urgent need for a recyclable material suitable for replacing glass fiber reinforced plastics in the automotive industry and having similar properties in terms of economy, tensile strength and breaking strength and specific gravity. But for other applications, such a material is urgently needed.

Fiber-reinforced plastics are known from the prior art, whose fiber component consists of renewable reinforcing fibers, such as flax, hemp or sisal.

So is for example from the DE 297 20 598 a nonwoven made of natural and synthetic fibers, in which flax, hemp, sisal, capok, jute, ramie, coconut, nettle or banana are used as natural fibers. From the DE 42 26 988 is a molding made of impregnated with a foamed synthetic resin natural fibers, in which natural fibers flax, hemp, sisal, coconut, cotton, silk or jute fibers are used.

However, the above-mentioned natural fibers have a low mechanical resistance, in particular a small modulus of elasticity, compared with the conventionally used fibers such as glass fibers, carbon fibers, steel fibers or aramid fibers. For these reasons, these fibers are not used in structural components that need to absorb compressive and tensile forces, but only in cladding components. Moreover, they are used - in short cut - as an extender for plastics.

Objects of the present invention

Object of the present invention is to provide a fiber-reinforced plastic that is recyclable, while meeting the highest standards of specific gravity and tensile and breaking strength, and therefore also used for load-bearing structures, for example in vehicle construction, aircraft or shipbuilding can be.

These objects are achieved with the features of the independent claims of the present invention.

1. a) Zerteilen des Bambusrohres quer zu seiner Längsachse in einzelne Abschnittselemente,
2. b) Spalten der Abschnittselemente entlang ihrer Längsachse in Spaltelemente,
3. c) Zerfaserung der Spaltelemente zu einzelnen Fasern mittels Druckbeaufschlagung, und
4. d) Trocknung der Bambusfasern,

wobei das Bambusrohr bzw. die Bambusfasern während dieses Verfahrens zusätzlich einem Entzuckerungsschritt unterworfen werden.In this case, a method for producing bamboo fibers is initially provided, comprising the following steps:

1. a) dividing the bamboo tube transversely to its longitudinal axis into individual section elements,
2. b) splitting the section elements along their longitudinal axis into splitting elements,
3. c) defibration of the gap elements to individual fibers by means of pressurization, and
4. d) drying the bamboo fibers,

wherein the bamboo or bamboo fibers are additionally subjected to a Entzuckerungsschritt during this process.

It should be noted that the above steps need not necessarily be performed in the order shown. For example, step a) can also be performed after step b) (see below).

In principle, it is difficult to produce bamboo raw fibers suitable for use in fiber reinforced plastics. Thus, bamboo cane has longitudinal growth accounts that are unsuitable for the production of raw fiber. Therefore, only the material located between the nodes can be used for the production of the raw fibers. This implies that the manufactured bamboo raw fibers can not be longer than the distance of the nodes of a pipe to each other. The nodes have distances of a maximum of 400 mm. In the preferred bamboo species used, the node spacing is in the range between 40 and 80 mm. As the distances of the nodes vary, it is difficult to machine the raw fibers. For this reason, fiber-reinforced plastics with bamboo raw fibers have not yet been produced.

Applicants of the present invention have succeeded for the first time in inexpensively producing bamboo raw fibers in the stated lengths in large quantities. It is only through this step that it is possible to economically produce fiber-reinforced plastics with bamboo raw fibers of the stated lengths.

A particular disadvantage is that bamboo cane contains significant amounts of sugar. This is puzzling at first, but is understandable when one realizes that bamboo (subfamily: Bambusoideae) as well as sugar cane (subfamily: Panicoideae) belongs to the family of the sweet grasses (Poaceae).

In particular, glucose, fructose and sucrose are present. In sections, contents of up to 1400 nmol of sugar per mg dry weight are measured.

The sugar content, however, represents a major problem for the use of the bamboo fibers planned according to the invention. Sugar is known to have hygroscopic properties and therefore forms molasses. These can interfere with the manufactured, reinforced with bamboo fibers plastic. So they can e.g. Create cavities that affect the stability of the plastic. In addition, molasses can contain pests such as Attract insects, which then leave traces of eating on your part, and lead to undesirable discoloration, as they are e.g. due to caramelization.

The inventor of the present invention first and surprisingly recognized this problem and addressed it accordingly. In the method according to the invention for producing continuous fibers from bamboo tubes, the starting material, the bamboo tube, is therefore first desugared. For this, the harvested bamboo cane is watered and then washed.

The discharge takes place in the flow or in large basins in the batch process. Preferably, the water temperature is in the range between 20 ° C and 30 ° C inclusive. Both in the batch and in the flow process, the water can preferably be waved.

It is preferably provided that the desugarization takes place after the bamboo tube is subdivided transversely to its longitudinal axis into individual section elements and the section elements are divided along their longitudinal axis into gap elements (for example quarter), as will be described below. In this case, preferably, the actual node material should be removed. Only then does the further defibration take place.

Alternatively, it can be provided that the bamboo is fed directly after hitting the above-described Entzuckerungsprozess and only then subdivided transversely to its longitudinal axis into individual section elements.

After de-saccharification - especially if it takes place on the undivided bamboo cane - a drying step can be used. For this, the de-sugared tubes are preferably cut into 2 m long sections. The drying can be done for example in a drying tunnel, the sections are stored on a conveyor belt. The drying oven can be solar powered, for example.

Preferably, the bamboo tube is divided transversely to its longitudinal axis into individual section elements by the bamboo tube is divided before and behind a growth-related node in the transverse direction. The resulting section elements represent the material of the bamboo tube located between the nodes.

Incidentally, it is preferably provided that subsequently the actual nodes are removed. The obtained section elements are in a further processing step split along its longitudinal axis into a plurality of gap elements, for example quarter, which preferably have the same length as the section elements, but a smaller diameter.

The defibration takes place as described below. After defibering, the fibers thus produced are dried again. The aim is a final water content of <0.1% by weight. This drying step may preferably be carried out in an infrared dryer.

In the process mentioned, a final sugar content of ≥0% by weight and ≤1% by weight, preferably 0.5% by weight, particularly preferably 0.1% by weight, and very particularly preferably 0.05% by weight .-% desired. Bamboo fibers produced in this way are also referred to below as "virtually sugar-free".

It is also important to point out that the bamboo fibers produced according to the invention no longer absorb water after drying. As a result, they can no longer be desugared at this time because the water required for de-sugaring no longer penetrates into the fibers. For this reason, the Entzuckerungsschritt preferably takes place at the beginning of the process. Conversely, the fact that once dried bamboo fibers no longer absorb water, a particular advantage of these fibers, which distinguishes them from other natural fibers (jute, sisal, kapok, etc.).

Bamboo fibers therefore have a much higher modulus of elasticity than other natural fibers. Investigations by the inventors have shown that bamboo raw fibers have an average tensile strength of 87.5 N mm ^-2 , an average elongation at break of 10.5% and an average tensile modulus of 3420 N mm ^-2 . This is one reason for the high tensile strength of the bamboo fiber reinforced plastics produced according to the invention

Due to the rough surface of the bamboo raw fibers (filaments) produced by the applicants for the first time, these are particularly suitable for the production of nonwovens. The bamboo fibers produced in this way preferably have the following dimensions: prefers Especially preferred Thickness (mm) ≥ 0.01 and ≤ 1 mm ≥ 0.2 and ≤ 0.5 mm Length (mm) ≥ 0.1 and ≤ 400 mm 40 and ≤ 80 mm

The process according to the invention can be carried out, for example, as follows: example 1 Example 2 Beat Beat desugar Dicing across the longitudinal axis Dicing across the longitudinal axis Columns along the longitudinal axis ("quarter") dry desugar Columns along the longitudinal axis dry ( "Quarters") fray fray dry dry

It is preferably provided that bamboo tubes are used for the inventive method, which are grown for at least 3 years before they were felled.

Only after the age of three, the inventor has found, is the bamboo sufficiently lignified (lignified), the water and sugar content sufficiently reduced and the silica content sufficiently high. The sugar content is then, for example, then already below 10 wt .-%. Therefore, these bamboo tubes are particularly suitable for the purposes mentioned, since they have a particularly high strength and durability are particularly preferably used for the production of bamboo tubes that have grown for at least 4, very preferably even 5, years before they were felled, since in In these cases, the benefits mentioned above are even greater.

Preferably, the method uses bamboo of the type "Mao bamboo".

Particularly preferred is provided that bamboo tubes are used, which were stored lying down after felling.

Furthermore, it is preferably provided that the pressurization in step e) takes place by means of a press. The gap elements are preferably clamped in a press and shredded by applying a preset pressure in a simple manner to individual fibers.

According to the invention bamboo fibers are also provided, which can be produced by the method according to the invention. Practically sugar-free bamboo fibers can be produced for the first time with the process according to the invention, which for the first time make it possible to use bamboo fibers as reinforcing fibers for plastics.

According to the invention, a method is also provided for producing a nonwoven comprising the bamboo fibers referred to above, the method being a needle-punching method

The fibers are laid in a card to a fleece. The clutter adds loose individual fibers to a batt and parallelises them. Depending on how the carding tape is formed, the nonwoven has a preferred direction, which is maintained during solidification. About a crosslapper several layers are placed on each other before needling in heavy grades. The solidification of the web is done with various types of needles z. B. crown needles. Such methods are for example in the DE 10215571 described.

Furthermore, according to the invention, methods are provided for producing a fiber-reinforced plastic, plastic component or a semifinished plastic product, wherein the bamboo fibers referred to above are added to the plastic raw material.

In principle, all thermoplastics, thermosets or elastomers are used as plastic raw material for the matrix component. Thus, e.g. Polyolefins, polybuthylenes, polyurethanes, acrylic resins, polycarbonates, thermoplastic elastomers polystyrenes, polyesters, polyacetals, polyamides, polyethylenes, polypropylenes, PVC, ABS and and compounds based on the materials listed above. Also suitable are engineering plastics (PA, PAG, PAGG).

The use according to the invention of bamboo fibers as a fiber component in a fiber-reinforced plastic has a number of significant advantages: in contrast to glass-fiber reinforced plastics, such plastics can easily be shredded and can then be melted down and recycled. Just as well, they can also be thermally recycled, ie burned.

In contrast to offset with flax, hemp or sisal plastics bamboo fiber reinforced plastics have a much higher tensile strength, since the bamboo fibers according to the invention have a much higher modulus of elasticity than the former. Investigations by the inventors have shown that bamboo raw fibers have an average tensile strength of 87.5 N mn ^-2 , an average elongation at break of 10.5% and a mean tensile modulus of 3420 N mm ^-2 .

Further, experiments of the inventors have shown that a workpiece made of a plastic according to the invention, consisting of polypropylene as matrix and bamboo fibers as a fiber component, has tensile and compressive properties which correspond to that of glass fiber reinforced plastics with 20% glass fiber content.

Bamboo fibers are - despite their fundamental flammability - in contrast to many other natural fibers relatively flame retardant, which already leads to an unfinished inventive plastic to a more difficult flammability. Nevertheless, the plastics according to the invention, as indicated above, can be burned for disposal purposes.

In addition, bamboo fibers in the dried state - again in contrast to many other natural fibers - have virtually no moisture absorption.

In contrast to coal, glass, steel or aramid fibers, bamboo fibers have a large surface area due to their rough structure. This leads to a particularly intimate connection with the plastic matrix.

Bamboo fibers are also a renewable raw material, which is very inexpensive compared to the conventionally used fibers, but also compared to other natural fibers.

Moreover, bamboo fibers have an antibacterial effect, making their use in fiber-reinforced plastics for the medical field conceivable.

The said attachment can be used in many different ways. For example, the fibers can be twisted or twisted into continuous fibers. These filaments can be coextruded with a plastic and then processed into granules, as in US Pat EP2060664 the applicant of the present application.

Alternatively it can be provided that bamboo fibers are added to a single-layer or multi-layer plastic nonwoven fabric, a prepreg or an SMC.

The proportion of bamboo fibers is preferably in the range between> 0 and ≤ 80% by weight. Particularly preferred is a range between ≥10 and ≤ 50 wt .-% provided.

Thermoplastics are preferably used for this process, but it is also possible to use thermosetting plastics.

If it is a nonwoven, e.g. Carded staple fibers with a staple length between 15 and 100 mm are used. Different fiber types may be used, e.g. the thermoplastic PE for a matrix fiber component and acrylic for a binder fiber component. Also suitable combinations are stretched PE terephthalate and undrawn PE terephthalate, and stretched PE terephthalate and copolyester. It is important that the binder fiber component has a lower melting point.

In addition, the nonwoven fabric may be preconsolidated prior to clogging of the bamboo fibers by needle treatment or areal heat.

It is particularly preferred that the bamboo fibers are added to a nonwoven, prepreg, a film, a web or an SMC by laying a layer of the nonwoven, prepreg, film, web or SMC on a layer of a composite comprising bamboo fibers.

This fiber composite may be e.g. to be a woven fabric, a knit, a knit or a scrim, a mat, a roving or the like. Particularly preferred is a nonwoven containing bamboo fibers.

It is likewise preferred that the bamboo fibers are added to the nonwoven, prepreg or SMC by applying loose bamboo fibers to a layer of the nonwoven, prepreg or SMC.

In contrast to cut glass fibers, bamboo fibers lay out disorderly on the nonwoven, prepreg, or SMC, while the latter tend to polarize because they static charge in contrast to the bamboo fibers.

However, the so-called Wirrwar arrangement offers substantial advantages, since the material produced has an increased tensile strength in virtually all directions (anisotropic reinforcement), while in the polar orientation of the fibers in one direction there is a higher tensile strength than in the other directions (isotropic reinforcement).

For the jumble arrangement, a hopper with metering device is preferably used.

Likewise, it is preferably provided that a mixed nonwoven comprising bamboo fibers and plastic fibers of at least one type is produced. Such a mixed nonwoven fabric is preferably produced by the needle-felting method already described above.

The fibers are laid in a card to a fleece. The clutter adds loose individual fibers to a batt and parallelises them. Depending on how the carding tape is formed, the nonwoven has a preferred direction, which is maintained during solidification. About a crosslapper several layers are placed on each other before needling in heavy grades. The solidification of the web is done with various types of needles z. B. crown needles. Such methods are for example in the DE 10215571 described.

In a further embodiment of the method according to the invention, it is provided that an adhesion promoter is added to the starting materials. This contributes to a particularly intimate connection between bamboo fibers and the matrix component. Suitable adhesion promoters are e.g. MAH-PP, HC5, Polybond 3200, or MHA. In principle, exposing as many microfibrils as possible to the surface of the bamboo fiber, in particular the parenchyma cells, creates the liability requirements for the connection with other connecting or bonding fibers. Additives, in particular the mechanical connection with other finely divided synthetic fibers. However, this process can be facilitated by said adhesion promoter.

It is also possible to add additives for increasing the impact strength or also flame retardants to the starting materials. In the case of the former it can be e.g. to EPDM, which is added in a proportion of 7-15 wt .-% and increases the impact resistance significantly.

The latter can be all commercially available flame retardants. In principle, however, it should be noted that the bamboo fiber itself is already flame-retardant and can transfer this property to the composite plastic according to the invention.

Furthermore, it is preferably provided that at least one layer of the nonwoven, prepreg or SMC is coated with a binder before the bamboo fibers are added. This may be e.g. to trade a polyester resin. This step is u.A. dispensable if two different fiber types are used, which are connected by thermal treatment.

Furthermore, it is preferably provided that the nonwoven, prepreg or SMC mixed with the bamboo fibers is subjected to a compression molding process.

This can possibly take place after the calendering and / or after the tempering. The pressing temperature is preferably below the melting temperature of the plastic component. The pressing pressure can be in the range between 6 and 10 kg cm ^-2 , for example, and the pressing time can be, for example, 1.5-6 minutes.

Preferably, said workpiece is heated so that any containing thermoplastic materials melt and so can form an intimate connection with the bamboo fibers.

For this purpose, a temperature is preferably used which is above the melting temperature of the relevant thermoplastic material. This may be, for example, a temperature in the range between 130 and 250 ° C, all numerical intermediate values should be regarded as revealed. For example, a temperature of 170 ° C. is used for a mixed nonwoven made of bamboo fibers and polypropylene. The advantage here is that any existing residual moisture is expelled from the bamboo fibers.

As mentioned above, if the nonwoven fabric consists of two different fiber types, it may be advantageous to bring the temperature during the tempering step to a value above the melting point of one and below the melting point of the other fiber.

It is also preferred that the nonwoven, prepreg or SMC stained with the bamboo fibers be calendered, for example, to give the material a desired thickness.

Furthermore, it is preferably provided that the fleece, prepreg or SMC mixed with the bamboo fibers is subjected to an annealing step. It is provided, for example, that the temperature is not above the melting point of the thermoplastic material (for example, 170 ° C), so that the plastic does not melt, but only thermal stresses are eliminated.

The invention further provides a fiber-reinforced plastic, which can be produced by a method according to the invention, and / or a fiber-reinforced plastic, comprising bamboo fibers produced according to the invention.

1. a) mit einem erfindungsgemäßen Verfahren hergestellt wird, und/oder
2. b) erfindungsgemäß hergestellte Bambusfasern aufweist

Furthermore, a component made of a fiber-reinforced plastic is provided which

1. a) is produced by a method according to the invention, and / or
2. b) bamboo fibers produced according to the invention

1. a) Karosserie-, Innenauskleidungs und/oder Verkleidungsteile im Automobil-, Flugzeugund/oder Schiffbau;
2. b) Rotorblätter, z.B. für Windkraftanlagen
3. c) Rohre für den Hoch- und den Tiefbau;
4. d) Fassadenteile für den Hochbau;
5. e) Fenster- und Türrahmen,
6. f) Kunststoffprofile,
7. g) Werkzeuge und/oder Arbeitsgeräte
8. h) Kunststoffgehäuse
9. i) Paneele.

The component is preferably at least one component selected from the group containing

1. a) body, interior lining and / or trim parts in the automotive, aircraft and / or shipbuilding;
2. b) Rotor blades, eg for wind turbines
3. c) civil engineering and civil engineering pipes;
4. d) facade parts for building construction;
5. e) window and door frames,
6. f) plastic profiles,
7. g) tools and / or implements
8. h) plastic housing
9. i) panels.

Examples and illustrations:

With the method according to the invention practically sugar-free bamboo fibers are produced with a length between 30 and 60 mm. Subsequently, a mixed fleece with 50% by weight of bamboo fibers and 50% by weight of fine-fiber polypropylene fibers is produced by means of the described needle-punching process. In this case, a material thickness of 5 mm and a basis weight of 200 g / m2 is generated.

The resulting web is heated to 140 ° C for 19 minutes. As a result, a softening of the thermoplastic fibers is achieved, so enter into a close bond with the natural fibers. The workpiece is then cooled and can be pressed into shape, if necessary.

Fig. 1 shows practically anhydrous, produced by the process according to the invention bamboo fibers. The scale bar has a length of 100 mm.

Fig. 2 shows a mixed fleece comprising bamboo fibers and plastic fibers (polypropylene). Such a mixed nonwoven fabric is preferably produced by the needle-felting method already described above. Initially, practically sugar-free bamboo fibers with a length between 30 and 60 mm are produced. Subsequently, a mixed nonwoven with 50% by weight of bamboo fibers and 50% by weight of fine fiber polypropylene fibers is produced. The said mixed fleece can now be thermally pressed into a solid component.

Claims (19)

Process for producing bamboo fibers, comprising the following steps: a) dividing the bamboo tube transversely to its longitudinal axis into individual section elements, b) splitting the section elements along their longitudinal axis into splitting elements, c) defibration of the gap elements to individual fibers by means of pressurization, and d) drying the bamboo fibers,
wherein the bamboo or bamboo fibers are additionally subjected to a Entzuckerungsschritt during this process. A method according to claim 1, characterized in that bamboo tubes are used which have grown for at least 3 years before being felled. A method according to any one of claims 1-2, characterized in that bamboo tubes are used, which were stored lying down after felling. Method according to one of claims 1-3, characterized in that the pressurization takes place in step e) by means of a press. Bamboo fibers producible by a process according to any one of claims 1-4 A process for producing a nonwoven fabric comprising bamboo fibers according to claim 5, characterized in that the process is a needle-punching process A method for producing a fiber-reinforced plastic, plastic component or a plastic semi-finished product, characterized in that a plastic raw material bamboo fibers are added according to claim 5. A method according to claim 7, wherein bamboo fibers are added to a single or multi-ply plastic non-woven fabric, a prepreg or an SMC. A method according to claim 7, characterized in that the bamboo fibers are added to a nonwoven, prepreg, a film, a web or an SMC by a layer of the nonwoven, prepreg, the film, the web or the SMC a layer of a composite containing bamboo fibers, preferably a nonwoven containing bamboo fibers, is laid on or underlaid. A method according to claim 7, characterized in that the bamboo fibers are added to the nonwoven, prepreg or SMC by applying loose bamboo fibers to a layer of the nonwoven, prepreg or SMC. A method according to claim 7, characterized in that a mixed nonwoven comprising bamboo fibers and plastic fibers of at least one type is produced. A method according to any one of claims 7-11, characterized in that at least one layer of the nonwoven, prepreg or SMC is coated with a binder prior to the addition of the bamboo fibers. A method according to any one of claims 7-12, characterized in that the fleece, prepreg or SMC mixed with the bamboo fibers is calendered. A method according to any one of claims 7-13, characterized in that the nonwoven, prepreg or SMC mixed with the bamboo fibers is subjected to a compression molding process. A method according to any one of claims 7-14, characterized in that the nonwoven, prepreg or SMC mixed with the bamboo fibers is subjected to an annealing step. Fiber-reinforced plastic, producible by a method according to one of claims 7-15. Fiber-reinforced plastic comprising bamboo fibers according to claim 5. Component of a fiber-reinforced plastic, characterized in that a) this is prepared by a process according to any one of claims 7-15, and / or b) this bamboo fibers according to claim 5 Component according to claim 18, characterized in that it contains in the component by at least one component selected from the group a) body or trim parts in the automotive, aircraft and / or shipbuilding; b) Rotor blades, eg for wind turbines c) civil engineering and civil engineering pipes; d) facade parts for building construction; e) window and door frames, f) plastic profiles, g) tools and / or implements h) plastic housing i) panels
is.

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