Method and equipment for recycling glass fibers in waste fan blades

Abstract

The invention discloses a method and equipment for recycling glass fibers in waste fan blades. The method comprises the following steps that S1, the fan blades are subjected to large-size cutting; s2, under the oxygen-free or oxygen-deficient condition, the cut fan blades are heated through electromagnetic heating for pyrolysis, pyrolysis gas, pyrolysis oil and pyrolysis solid residues are obtained through pyrolysis, and the pyrolysis gas and the pyrolysis oil serve as fuel to be recycled; s3, the pyrolysis solid residues are screened, glass fiber bundles are separated out, and the glass fiber bundles are opened and loosened; and S4, processing the loose glass fibers into a fiber disc for treating sewage or polluted air. According to the method and the equipment for recycling and reusing the glass fibers in the waste fan blades, the problems of low additional value, secondary pollution and the like of glass fiber recycling are solved through a fuel and glass fiber dual-recycling method, and the method and the equipment have the advantages of high resource utilization rate, environmental friendliness, economy and wide application prospect. And an innovative solution is provided for zero-waste treatment of the waste fan blades.

Description

Technical Field

[0001] The present invention belongs to the technical field of resource treatment of waste composite materials, and particularly relates to a method and equipment for recycling glass fibers in waste wind turbine blades. Background Art

[0002] With the rapid development of renewable energy, wind energy, as a clean and renewable energy form, plays an increasingly important role in the power field. As the core component of a wind turbine, the quality of the wind turbine blade directly affects the power generation efficiency and service life of the wind turbine. However, during the use of wind turbine blades, affected by factors such as the environment and temperature, they are prone to aging, cracks and other damages, resulting in a decline in their performance. At the same time, wind turbine blades have a long service life, usually 20 - 25 years. There is a high tide of retirement of old wind turbine blades globally, and the problem of treating waste wind turbine blades has become increasingly prominent.

[0003] Currently, the recycling technologies of waste wind turbine blades mainly include the following: (1) Mechanical recycling method: mechanically crushing or cutting the blades for secondary use as raw materials, but this method has problems such as low recycling efficiency and poor quality of recycled materials. (2) Chemical recycling method: making waste materials into other recyclable materials through chemical modification or decomposition. This method is difficult and costly, but the recycling effect is better, mainly including incineration method, supercritical fluid method and solvent decomposition method. (3) Pyrolysis method: heating the wind turbine blades to 350 - 700 °C under anaerobic or anoxic conditions to convert the resin into pyrolysis gas and pyrolysis oil for fuel recovery; the insoluble and infusible fiber components are converted into solid residues (inert), and the fibers and carbon are recovered after screening. However, this method has problems such as high pyrolysis temperature, high energy consumption, high requirements for equipment, and risks of secondary pollution.

[0004] In summary, the existing recycling technologies of waste wind turbine blades mainly have the following problems: (1) Low resource utilization rate, unable to fully utilize the valuable components in the wind turbine blades. (2) High risk of environmental pollution and serious secondary pollution problems. (3) High cost and great technical difficulty, making it difficult to promote and apply.

[0005] Aiming at the problems existing in the above-mentioned existing recycling technologies of waste wind turbine blades, the present invention provides a method and equipment for recycling glass fibers in waste wind turbine blades, which can improve the opening efficiency of glass fiber bundles after pyrolysis, fully utilize the valuable components in the wind turbine blades, utilize the adsorption function of residual micro-carbon particles, develop high-value-added products, realize the full-chain resource utilization of waste wind turbine blades, avoid secondary pollution, reduce costs, improve resource utilization rate, and promote the popularization and application of wind turbine blade recycling technologies. Summary of the Invention

[0006] Objective of the Invention: To overcome the above deficiencies, the objective of the present invention is to provide a method and equipment for recycling and reusing glass fibers in waste wind turbine blades. The design is reasonable. By means of the method of dual recycling of fuel and glass fibers, problems such as low added value of fiber recycling and secondary pollution are solved. It combines high resource utilization rate and environmental friendliness, and has economic advantages, providing an innovative solution for the "zero-waste treatment" of waste wind turbine blades.

[0007] The objective of the present invention is achieved through the following technical solutions: A method for recycling and reusing glass fibers in waste wind turbine blades, comprising the following steps: S1: Perform large-size cutting on the wind turbine blade so that the cut wind turbine blade maintains the relative integrity of the structure of its resin and fiber components; S2: Under anaerobic or anoxic conditions, use electromagnetic heating to heat the cut wind turbine blade to 350 - 500 °C for pyrolysis. Pyrolysis produces pyrolysis gas, pyrolysis oil, and pyrolysis solid residue, and the pyrolysis gas and pyrolysis oil are recovered as fuel; S3: Screen the above-mentioned pyrolysis solid residue to separate glass fiber bundles, and use the synergistic effect of a vibration device and compressed air to open and loosen the glass fibers in the glass fiber bundles to obtain loose glass fibers; S4: Process the above-mentioned loose glass fibers into fiber discs.

[0008] For the method for recycling and reusing glass fibers in waste wind turbine blades of the present invention, large-size cutting and electromagnetic pyrolysis are adopted. By large-size cutting, the resin and fiber structure of the waste wind turbine blade is retained. Under anaerobic / anoxic conditions, electromagnetic heating is used for pyrolysis. The resin in the wind turbine blade generates pyrolysis gas and pyrolysis oil, realizing efficient fuel recovery. After screening the pyrolysis residue, the synergistic effect of a vibration device and compressed air is used to open and loosen the glass fibers in the glass fiber bundles. Combining the adsorption characteristics of a large number of residual micro-carbon particles on the surface of the glass fibers, a continuous network structure is formed, which can be processed into fiber discs for efficiently capturing pollutants in gases (such as Cl2, SO2, etc.) and liquids (such as oil stains, particles).

[0009] Further, in the above-mentioned S1, the wind turbine blade is cut, and the size of the cut wind turbine blade is ≥ 800 mm.

[0010] The present invention controls the cutting size, reduces the cutting surface area and energy consumption, and at the same time retains the combined structure of the resin and fibers in the thermosetting composite material of the wind turbine blade. This design is different from the traditional random cutting method, avoiding the problem that traditional cutting may cause excessive separation of the resin and fibers, affecting the subsequent reuse of glass fibers.

[0011] Further, in the method for recycling glass fibers in the above-mentioned waste wind turbine blades, in S2, the cut wind turbine blades are rapidly heated to 350 - 500°C at a heating rate of 5 - 10°C / min by electromagnetic heating.

[0012] Preferably, the cut wind turbine blades are rapidly heated to 450°C at a heating rate of 8°C / min by electromagnetic heating.

[0013] In actual industrial production, the traditional incineration method will produce a large amount of harmful substances. However, the present invention adopts the electromagnetic heating method, which has the advantages of fast heating rate, precise temperature control, and low energy consumption, and can avoid the dioxin pollution caused by the traditional incineration method. In some areas with high environmental requirements, using this heating method can reduce the pollution to the surrounding environment.

[0014] Further, in the method for recycling glass fibers in the above-mentioned waste wind turbine blades, in S2, the pyrolysis gas includes H2, CH4, CO, etc., and the pyrolysis oil includes C5 - C20 hydrocarbons and aromatic compounds.

[0015] Pyrolysis gas and pyrolysis oil with different components have different uses and values. The present invention clarifies the components of pyrolysis gas and pyrolysis oil, which helps to further develop their applications. For example, H2, CH4, etc. in the pyrolysis gas can be used as clean energy, and C5 - C20 hydrocarbons and aromatic compounds in the pyrolysis oil can be used as chemical raw materials.

[0016] Further, in the method for recycling glass fibers in the above-mentioned waste wind turbine blades, in S3, the vibration device includes a horizontal vibration device and a vertical vibration device. The horizontal vibration device applies horizontal vibration according to the type of glass fiber bundle for preliminary separation of the glass fiber bundle, and the vertical vibration device is arranged upstream of the horizontal vibration device to apply vertical vibration for further loosening of the glass fiber bundle.

[0017] Further, in the method for recycling glass fibers in the above-mentioned waste wind turbine blades, in S3, compressed air is blown into the glass fiber bundle through the blower and air control valve of the compressed air supply device.

[0018] The type, action mode of the vibration device, and the supply mode of compressed air. The synergistic effect of these devices is the key to improving the glass fiber recovery efficiency of the present invention. For glass fiber bundles with different densities and sizes, through the cooperation of horizontal and vertical vibration devices and the action of compressed air, the fiber bundles can be more effectively opened and loosened into continuous network fibers, facilitating subsequent processing.

[0019] Preferably, through the combined treatment of the horizontal vibration (frequency 50 Hz) of the horizontal vibration device, the vertical vibration (frequency 30 Hz) of the vertical vibration device, and compressed air (pressure 0.5 MPa), the looseness of the fiber bundle reaches more than 90%.

[0020] Further, in the method for recycling and reusing glass fibers in the above-mentioned waste wind turbine blades, in S4, the loose glass fibers are pressed into a fiber disk with a continuous network structure, and the fiber disk uses the micro-carbon particles remaining on the glass fibers as an adsorption medium to adsorb pollutants.

[0021] The surface of the glass fibers regenerated from waste wind turbine blades at a relatively high pyrolysis temperature is covered with a thin layer of residual carbon (pyrolytic carbon), making it appear black, which reduces the utilization value of the regenerated glass fibers. This pyrolytic carbon is composed of polymer degradation residues in a non-oxidizing environment. In order to obtain greater economic value, in the prior art, the glass fibers with residual carbon are usually subjected to subsequent high-temperature calcination in an oxygen-containing environment. This process can remove most of the residual carbon and almost restore the natural color of the glass fibers, but it will increase the recycling cost and reduce the strength of the glass fibers.

[0022] The present invention uses the large amount of micro-carbon particles remaining on the surface of the glass fibers as an adsorption medium to make a fiber disk. When it is applied to a filter, it can enhance the ability to capture pollutants.

[0023] Further, in the method for recycling and reusing glass fibers in the above-mentioned waste wind turbine blades, in S4, the fiber disks are processed and combined into a disk filter by laminating or splicing, and the disk filter is used for the treatment of sewage or polluted air.

[0024] The specific application scenarios of the disk filter include: gas treatment, adsorbing dust particles, harmful gases (such as Cl2, SO2), and biological pollutants (viruses, bacteria, etc.); liquid treatment, removing oil stains, solvent residues, and trace soluble impurities in water.

[0025] Preferably, the loose glass fibers are pressed into a fiber disk with a porosity of 55%, and the fiber disk assembled into a filter has a purification efficiency of 95% for oily sewage.

[0026] The present invention also relates to the equipment used in the method for recycling and reusing glass fibers in the waste wind turbine blades, including: An electromagnetic pyrolysis device for pyrolyzing wind turbine blades; A horizontal vibration device configured to apply horizontal vibration according to the type of glass fiber bundle; A vertical vibration device arranged upstream of the horizontal vibration device for applying vertical vibration; A compressed air supply device, including a blower, an air control valve and an air flow nozzle, is used to blow compressed air into a glass fiber bundle.

[0027] Compared with the prior art, the present invention has the following beneficial effects: (1) The method for recycling and reusing glass fibers in waste wind turbine blades disclosed by the present invention has a high resource utilization rate. A method for dual recycling of fuel (pyrolysis gas, pyrolysis oil) and fiber (glass fiber, residual carbon) is designed to achieve the full-chain resource utilization of waste wind turbine blades, avoid secondary pollution, and achieve "zero waste treatment"; (2) The method for recycling and reusing glass fibers in waste wind turbine blades disclosed by the present invention processes glass fiber waste into fiber discs, and utilizes the micro-carbon particles remaining on the glass fibers after pyrolysis and applies them to filters for adsorbing pollutants. It has a high added value and can be widely applied in the environmental protection field; (3) The equipment of the method for recycling and reusing glass fibers in waste wind turbine blades disclosed by the present invention is reasonably designed. An electromagnetic pyrolysis device is used for pyrolysis, which has the advantages of fast heating rate, precise temperature control, and low energy consumption. It can avoid the dioxin pollution generated by the traditional incineration method, and the residual carbon adsorption function reduces the use of chemical reagents; The synergistic effect of the vibration device and the compressed air supply device can adapt to fiber bundles with different densities and sizes, improving the recycling efficiency. Description of the Drawings

[0028] Figure 1 It is a photo of the cut wind turbine blade in the method for recycling and reusing glass fibers in waste wind turbine blades described in the present invention; Figure 2 It is a state diagram of the wind turbine blade after pyrolysis at 450 °C in the method for recycling and reusing glass fibers in waste wind turbine blades described in the present invention; Figure 3 It is a SEM image of the recycled glass fibers magnified 1000 times in the method for recycling and reusing glass fibers in waste wind turbine blades described in the present invention; Figure 4 It is a SEM image of the recycled glass fibers magnified 5000 times in the method for recycling and reusing glass fibers in waste wind turbine blades described in the present invention; Figure 5 It is an EDS diagram of the scanning electron microscope energy spectrometer of the carbon element distribution on the surface of the recycled glass fibers in the method for recycling and reusing glass fibers in waste wind turbine blades described in the present invention; Figure 6 It is an EDS diagram of the types and contents of micro-area elements of the recycled glass fiber material in the method for recycling and reusing glass fibers in waste wind turbine blades described in the present invention; Figure 7The reticular structure diagram of the glass fiber after being opened and loosened by the synergistic action of the vibration device and compressed air in the method for recycling and reusing the glass fiber in the waste wind turbine blade of the present invention; Figure 8 The schematic structural diagram of the fiber disk processed by the recycled glass fiber in the method for recycling and reusing the glass fiber in the waste wind turbine blade of the present invention; Figure 9 The schematic structural diagram of the filter made of the fiber disk processed by the recycled glass fiber in the method for recycling and reusing the glass fiber in the waste wind turbine blade of the present invention. Specific embodiments

[0029] Next, Examples 1, 2, and 3 will be combined with specific experimental data and the attached Figures 1 - 9 to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0030] Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present invention. The following Example 1 provides a method for recycling and reusing the glass fiber in the waste wind turbine blade.

[0031] Example 1 The method for recycling and reusing the glass fiber in the waste wind turbine blade of Example 1 includes the following contents: As Figure 1 shown, the waste wind turbine blade is cut into large sizes so as to maintain the relative integrity of the resin and fiber components of the thermosetting composite material in the waste wind turbine blade, and the cutting generates a smaller surface area and lower energy consumption during the cutting process; under an anaerobic or anoxic condition, the cut waste wind turbine blade is pyrolyzed by electromagnetic heating and quickly heated to 350 - 500 °C. The resin in the waste wind turbine blade is converted into pyrolysis gas and pyrolysis oil during pyrolysis, and the pyrolysis gas and pyrolysis are recovered as fuels; the products of pyrolysis also include pyrolysis solid residues. The pyrolysis solid residues are screened to separate the glass fiber bundles, and the glass fiber in the glass fiber bundles is opened and loosened by the combination of a vibration device and compressed air to obtain loose glass fiber; the loose glass fiber is processed into a fiber disk; the above fiber disks are processed and combined into a disk filter, and the residual microcarbon particles on the glass fiber during pyrolysis are used to adsorb pollutants. This disk filter can be used for both sewage treatment and polluted air treatment.

[0032] Furthermore, the waste wind turbine blades are cut into large sizes of ≥800 mm. By controlling the cutting size and method, the cutting surface area and energy consumption can be reduced, while maintaining the bonding structure between the resin and fibers in the thermosetting composite material.

[0033] Furthermore, in an anaerobic or anoxic environment, the cut waste wind turbine blades are rapidly heated to 350 - 500 °C by electromagnetic induction heating technology, with a heating rate of 5 - 10 °C / min.

[0034] Furthermore, the pyrolysis gas includes H2, CH4, CO, etc., and the pyrolysis oil contains C5 - C20 hydrocarbons and aromatic compounds.

[0035] Wind turbine blades using fibers (carbon fibers or glass fibers) as reinforcement materials have high strength and high elasticity, and exhibit excellent material properties. Since glass fibers have a higher specific gravity than carbon fibers, the glass fibers will be very dense after being compressed into bundles during wind blade processing. Even after pyrolysis, the above - mentioned glass fiber bundles have not been well opened. Therefore, it is very important to open the glass fiber bundles with a large number of fibers after the wind turbine blades are pyrolyzed.

[0036] Furthermore, the vibration device includes a horizontal vibration device and a vertical vibration device. Among them, the horizontal vibration device preliminarily separates the glass fiber bundles, and the vertical vibration device is arranged upstream of the horizontal vibration device to further loosen the glass fiber bundles.

[0037] Furthermore, a compressed air supply device is used to blow compressed air into the glass fiber bundles, which can completely open the dense structure of the glass fiber bundles and form a continuous network of fibers.

[0038] In this Example 1, a combination of horizontal and vertical vibration devices and compressed air is used to open and loosen the glass fibers in the recycled glass fiber bundles. The network structure of the opened and loosened glass fibers is as Figure 7 shown.

[0039] On the surface of the glass fibers regenerated from waste wind turbine blades at a relatively high pyrolysis temperature, a thin layer of residual carbon will be covered, making them appear black, which reduces the utilization value of the regenerated glass fibers. The residual carbon is composed of polymer degradation residues in a non - oxidative environment. In order to obtain greater economic value, in the prior art, the above - mentioned glass fibers with residual carbon are usually subjected to subsequent high - temperature calcination in the presence of oxygen, which can remove most of the residual carbon and almost restore the natural color of the glass fibers, but will reduce the strength of the glass fibers.

[0040] Table 1 Main elements contained in the glass fibers in the pyrolysis solid residue after pyrolysis element Wt% C 19.70 O 28.17 Na 0.21 Mg 1.27 Al 5.05 Si 19.92 K 0.24 Ca 11.79 Fe 0.29 Au 13.36 Total amount: 100.00 Combined Figure 6As can be seen from Table 1, after pyrolysis, the carbon residue content on the glass fiber is very high, up to 19.7 wt%, almost approaching the content of elemental silicon in the glass fiber, which is 19.92 wt%.

[0041] Combined with Figure 3 、 4 、5, it can be seen that the above carbon residue particles are evenly distributed on each glass fiber. In practical applications, these carbon residue particles can serve as active adsorption particles. Moreover, due to the large number of these carbon residue microparticles, they can adsorb a large amount of other impurity particles. The long glass fiber has a continuous fiber phase and can be used as the mesh structure of the filtration system to capture impurities in gas / liquid.

[0042] Therefore, in Example 1, the mesh structure of the glass fiber is used to manufacture a fiber disk as shown in Figure 8 and then a disk filter as shown in Figure 9 is manufactured.

[0043] Furthermore, the disk filter can be applied to particularly important fluid flows, including air flows that may contain pollutants such as dust particles, water, solvent residues, oil residues, mixed water-oil residues, and harmful gases such as chlorine, benzene, sulfur dioxide, etc.; other common liquids include fuels, oils, solvent flows, etc. The above fluids can come into contact with the disk filter of Example 1 and can remove water, particulate pollutants, color-forming substances, and trace soluble impurities.

[0044] The following Example 2 provides a specific implementation method for recycling the glass fiber in waste wind turbine blades.

[0045] Example 2 As Figures 1 - 9 shown, the specific implementation method for recycling the glass fiber in the waste wind turbine blades of Example 2 includes the following content: placing the cut waste wind turbine blades (800 mm ≤ size ≤ 1 m) in an electromagnetic pyrolysis device, heating to 450 °C at a rate of 8 °C / min, condensing and recovering the pyrolysis gas as fuel, and directly storing the pyrolysis oil. After screening the pyrolysis solid residue, the glass fiber is separated and treated by horizontal vibration (frequency 50 Hz), vertical vibration (frequency 30 Hz), and compressed air (pressure 0.5 MPa). The looseness of the glass fibers in the glass fiber bundle reaches more than 90%. The loose glass fiber is pressed to form a fiber disk with a porosity of 55%. After being assembled into a disk filter, the purification efficiency for oily sewage reaches 95%.

[0046] Based on Example 1 or Example 2, the following Example 3 provides the equipment used in the method for recycling the glass fiber in waste wind turbine blades.

[0047] Example 3 The equipment used in the method for recycling and reusing glass fibers in the waste wind turbine blades described in Example 3 includes an electromagnetic thermal cracking device, a vibration device, and a compressed air supply device.

[0048] Among them, the vibration device includes a horizontal vibration device and a vertical vibration device. The horizontal vibration device is configured to apply horizontal vibration according to the type of glass fiber bundle, and the vertical vibration device is arranged upstream of the horizontal vibration device for applying vertical vibration. The compressed air supply device includes a blower, an air control valve, and an air flow nozzle for blowing compressed air into the fiber bundle.

[0049] In summary: The present invention provides an effective method and equipment for recycling and reusing glass fibers in waste wind turbine blades. Aiming at the problems existing in the above-mentioned existing recycling and reusing technologies of waste wind turbine blades, it realizes the full-chain resource utilization of waste wind turbine blades, avoids secondary pollution, reduces costs, improves resource utilization rates, and promotes the popularization and application of the recycling and reusing technologies of waste wind turbine blades.

[0050] The specific application ways of the present invention are numerous, and the above description is only the preferred implementation manner of the present invention. It should be noted that the above embodiments are only used to illustrate the present invention and are not used to limit the protection scope of the present invention. For those of ordinary skill in the art of this technology, without departing from the principle of the present invention, several improvements can still be made, and these improvements should also be regarded as the protection scope of the present invention.

Claims

1. A method for recycling and reusing glass fibers in waste wind turbine blades, characterized in that, It includes the following steps: S1: Cut the wind turbine blade in large size so that the resin and fiber components of the cut wind turbine blade maintain the relative integrity of the structure; S2: Under anaerobic or anoxic conditions, use electromagnetic heating to heat the cut wind turbine blade to 350 - 500 °C for pyrolysis. The pyrolysis produces pyrolysis gas, pyrolysis oil and pyrolysis solid residue, and the pyrolysis gas and pyrolysis oil are recovered as fuels; S3: Screen the above pyrolysis solid residue to separate the glass fiber bundles, and use the synergistic effect of the vibration device and compressed air to open and loosen the glass fibers in the glass fiber bundles to obtain loose glass fibers; S4: Process the above loose glass fibers into fiber disks.

2. The method for recycling and reusing glass fibers in waste wind turbine blades according to claim 1, wherein, In S1, the wind turbine blade is cut, and the size of the cut wind turbine blade is ≥ 800 mm.

3. The method for recycling and reusing glass fibers in waste wind turbine blades according to claim 1, wherein In S2, use electromagnetic heating to quickly heat the cut wind turbine blade to 350 - 500 °C at a heating rate of 5 - 10 °C / min.

4. The method for recycling and reusing glass fibers in waste wind turbine blades according to claim 1, wherein, In S2, the pyrolysis gas includes H2, CH4, CO, and the pyrolysis oil includes C5 - C20 hydrocarbons and aromatic compounds.

5. The method for recycling and reusing glass fibers in waste wind turbine blades according to claim 1, characterized in that, In S3, the vibration device includes a horizontal vibration device and a vertical vibration device. The horizontal vibration device applies horizontal vibration according to the type of glass fiber bundle for preliminary separation of the glass fiber bundle, and the vertical vibration device is arranged upstream of the horizontal vibration device to apply vertical vibration for further loosening of the glass fiber bundle.

6. The method for recycling and reusing glass fibers in waste wind turbine blades according to claim 1, characterized in that, In S3, compressed air is blown into the glass fiber bundle through the blower and air control valve of the compressed air supply device.

7. The method for recycling and reusing glass fibers in waste wind turbine blades according to claim 1, wherein, In S4, the loose glass fibers are pressed into a fiber disk with a continuous network structure, and the fiber disk uses the residual micro-carbon particles on the glass fibers as an adsorption medium to adsorb pollutants.

8. The method for recycling and reusing glass fibers in waste wind turbine blades according to claim 1, characterized in that, In S4, the fiber disks are processed and combined into a disk filter by laminating or splicing, and the disk filter is used for the treatment of sewage or polluted air.

9. The method for recycling and reusing glass fibers in waste wind turbine blades according to claim 8, wherein, The porosity of the disk filter is 40% - 70%.

10. The equipment for the method of recycling and reusing fiberglass in waste wind turbine blades according to any one of claims 1 to 9, characterized in that, It includes: An electromagnetic heating device for pyrolysis of the wind turbine blade; A horizontal vibration device configured to apply horizontal vibration according to the type of glass fiber bundle; A vertical vibration device arranged upstream of the horizontal vibration device for applying vertical vibration; A compressed air supply device including a blower, an air control valve and an air flow nozzle for blowing compressed air into the glass fiber bundle.

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