Preparation method of prepreg shaft and prepreg shaft

Abstract

The invention discloses a preparation method of a prepreg shaft and the prepreg shaft. The preparation method of the prepreg shaft comprises the following steps: providing a wide prepreg; the wide prepreg is cut into a plurality of prepreg narrow bands, and the prepreg narrow bands are rewound to a winding drum; the surface of the prepreg narrow band is sequentially coated with a first protective film, a foaming film and a second protective film, an air gap is formed between the foaming film and the second protective film, and the prepreg shaft is obtained. According to the method, after the prepreg is slit and rewound, the surface of the prepreg is sequentially coated with the first protective film, the foaming film and the second protective film, and the first protective film can be attached to the surface of the prepreg to define a small extrusion deformable space; moreover, the foaming film and an air gap formed between the foaming film and the second protective film can provide buffering, the degree of deformation of the prepreg shaft caused by external extrusion in the storage and transportation processes is reduced, the broken filament rate of the surface of the prepreg is reduced, and the yield and quality of the prepreg and products thereof are improved.

Description

Technical Field

[0001] The present application relates to the technical field of a method for preparing a prepreg and a prepreg composite material, and in particular to a method for preparing a prepreg shaft and a prepreg shaft. Background Art

[0002] Prepreg, as a key intermediate material for high-performance composite materials, is made by impregnating reinforcing fibers (such as carbon fiber, glass fiber, etc.) into a resin matrix and then undergoing a semi-curing process. It is widely used in aerospace, rail transit, new energy and other fields.

[0003] However, fiber fuzzing (commonly known as fuzz) is easily produced in the existing prepreg preparation process, which becomes a technical bottleneck restricting the stability of product quality. Summary of the invention

[0004] In order to overcome the problems existing in the related art, the present application provides a method for preparing a prepreg shaft and a prepreg shaft.

[0005] According to a first aspect of an embodiment of the present application, a method for preparing a prepreg shaft is provided, comprising:

[0006] Provide wide width prepreg;

[0007] Cutting the wide prepreg into a plurality of prepreg narrow strips, and rewinding the prepreg narrow strips onto a winding drum;

[0008] A first protective film, a foaming film and a second protective film are sequentially coated on the surface of the prepreg narrow tape, with an air gap between the foaming film and the second protective film, so as to obtain a prepreg shaft.

[0009] In some embodiments, the first protective film, the foaming film and the second protective film are sequentially coated on the surface of the prepreg narrow tape, including:

[0010] Sequentially covering the surface of the prepreg narrow tape with the first protective film and the foaming film;

[0011] Putting the prepreg narrow tape covered with the first protective film and the foaming film into a packaging bag made of the second protective film;

[0012] exhausting part of the gas between the foaming film and the second protective film to form the air gap between the foaming film and the second protective film;

[0013] The opening of the packaging bag made of the second protective film is sealed.

[0014] In some embodiments, after rewinding the prepreg narrow tape onto a reel, the method further comprises:

[0015] A sealing plug is provided at the end of the coil barrel in the axial direction.

[0016] In some embodiments, the step of rewinding the prepreg tape onto a roll includes:

[0017] When the prepreg narrow tape is rolled up, a separator film is used to cover a single prepreg narrow tape.

[0018] In some embodiments, the width of the separator film is 2.5 mm to 3.5 mm larger than the width of a single prepreg tape; and / or

[0019] The thickness of the separation membrane is 0.09 mm-0.11 mm.

[0020] In some embodiments, the step of rewinding the prepreg tape onto a roll includes:

[0021] spirally winding the prepreg narrow tape onto the winding drum at a preset winding induction ratio;

[0022] Wherein, the preset indentation ratio is 0.2mm / 2 layers-0.3mm / 2 layers.

[0023] In some embodiments, after the surface of the prepreg tape is sequentially coated with a first protective film, a foaming film, and a second protective film, the preparation method further comprises:

[0024] placing the packaged prepreg narrow tape in a first preset environment and storing it for a preset period of time;

[0025] Transferring the prepreg narrow tape to a second preset environment and thawing it until there is no condensed water on the surface of the second protective film;

[0026] removing the second protective film, the foaming film and the first protective film;

[0027] Sampling is performed at a preset position of the prepreg narrow tape to count the number of hair fibers.

[0028] In some embodiments, the first preset environment includes a first temperature, the first temperature is less than -12°C; and / or,

[0029] The second preset environment includes a second temperature, and the second temperature is 18-26° C.; and / or,

[0030] The second preset environment includes a first humidity, and the first humidity is 25%-65% RH.

[0031] According to a second aspect of the present disclosure, there is provided a prepreg shaft, comprising:

[0032] Coil drum;

[0033] A prepreg narrow tape wound on the outer peripheral surface of the winding drum;

[0034] sequentially covering the prepreg narrow tape with a first protective film, a foaming film, and a second protective film;

[0035] There is an air gap between the foaming film and the second protective film.

[0036] In some embodiments, the prepreg shaft further comprises:

[0037] a separator film connected to the prepreg tape; and / or

[0038] A sealing plug is arranged at the end of the winding barrel in the axial direction.

[0039] The technical solution provided by the embodiments of the present application may include the following beneficial effects: after the prepreg is slitting and rewinding, by sequentially coating the surface of the prepreg with a first protective film, a foaming film, and a second protective film, the first protective film can fit together with the surface of the prepreg to define a smaller extrusion deformable space; and the foaming film and the air gap formed between the foaming film and the second protective film can provide a buffer, thereby reducing the degree of deformation of the prepreg shaft due to external extrusion during storage and transportation, which is beneficial to reducing the fuzz rate on the surface of the prepreg and improving the yield and quality of the prepreg and its products.

[0040] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0042] Figure 1 A flow chart of a method for preparing a prepreg shaft provided in one embodiment of the present application is shown;

[0043] Figure 2 A flow chart showing a method for preparing a prepreg shaft provided in another embodiment of the present application is shown;

[0044] Figure 3 A schematic diagram of a small winding retracting ratio material shaft provided in one embodiment of the present application is shown;

[0045] Figure 4 A schematic diagram of a large winding and retracting ratio material shaft provided in one embodiment of the present application is shown;

[0046] Figure 5 A partial schematic diagram of a prepreg narrow tape after winding provided by an embodiment of the present application is shown;

[0047] Figure 6A partial schematic diagram of a prepreg narrow tape after winding provided by an embodiment of the present application is shown;

[0048] Figure 7 A partial schematic diagram of the prepreg narrow tape after winding provided by an embodiment of the present application is shown.

[0049] In the figure:

[0050] 100a, small winding retracting ratio material shaft; 100b, large winding retracting ratio material shaft;

[0051] 10. Prepreg narrow tape;

[0052] 20. Separation membrane; 21. Overlapping area;

[0053] 30. Coil drum. DETAILED DESCRIPTION

[0054] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0055] In order to solve the problems existing in the related art, the present application provides a method for preparing a prepreg shaft and a prepreg shaft, the method for preparing the prepreg shaft comprising: providing a wide-width prepreg; slitting the wide-width prepreg into a plurality of prepreg narrow strips, and rewinding the prepreg narrow strips onto a reel; sequentially coating the surface of the prepreg narrow strips with a first protective film, a foaming film, and a second protective film, with an air gap between the foaming film and the second protective film, to obtain a prepreg shaft. In the present application, after the prepreg is slid and rewound, the surface of the prepreg is sequentially coated with a first protective film, a foaming film, and a second protective film, so that the first protective film can be bonded with the surface of the prepreg to define a smaller extrusion deformable space; and the foaming film and the air gap formed between the foaming film and the second protective film can provide a buffer, reduce the degree of deformation of the prepreg shaft caused by external extrusion during storage and transportation, and help reduce the hair rate on the surface of the prepreg, and improve the yield and quality of the prepreg and its products.

[0056] According to an exemplary embodiment of the present application, this embodiment provides a method for preparing a prepreg shaft, which is used to prepare a prepreg shaft with a very low hair rate, such as Figure 1 The method for preparing the prepreg shaft comprises the following steps:

[0057] Step S110: providing wide-width prepreg.

[0058] In this step, wide-width prepreg is an intermediate material used for composite material molding. It is made by impregnating reinforcing fibers (such as carbon fiber, glass fiber, etc.) into a resin matrix and then undergoing a specific process. Its width is usually greater than 1 meter (the specific width is adjusted according to application requirements).

[0059] In one example, the wide prepreg can be formed by cutting a prepreg masterbatch, and the width of the prepreg masterbatch can reach more than 6 meters. For example, the prepreg masterbatch is usually stored in a cold storage, and before use, the prepreg masterbatch should be transferred to an ambient temperature of 18°C-26°C and an ambient humidity of 25%-65%RH for thawing and standby.

[0060] Step S120, cutting the wide prepreg into a plurality of prepreg narrow strips, and rewinding the prepreg narrow strips onto a reel.

[0061] In this step, a cutting device such as a roller cutter can be used to cut the wide prepreg into narrow prepreg strips with smaller widths. The narrow prepreg strips with smaller widths can meet the technical requirements of automatic wire laying, lamination, etc., and the narrow prepreg strips with smaller widths can be combined to form prepreg strips with variable widths for high-precision laying to meet the manufacturing needs of complex curved surface components such as aerospace.

[0062] In this step, a winding device can be used to wind the prepreg tape cut into narrow strips onto a winding drum. The winding drum is a cylindrical structure that is detachable from the winding device and is used to wind the prepreg tape. During the winding process, a spiral reciprocating winding or an axial adjustment mechanism can be used to wind the prepreg tape to reduce or avoid misalignment of the prepreg tape and improve the winding quality.

[0063] Step S130: sequentially covering the surface of the prepreg narrow strip with a first protective film, a foaming film and a second protective film, with an air gap between the foaming film and the second protective film, to obtain a prepreg shaft.

[0064] In this step, the surface of the prepreg narrow strip can be coated with a first protective film, a foaming film and a second protective film in sequence by manual or automated equipment. The first protective film is a protective film located in the innermost layer, and the first protective film is used to separate the foaming film and the prepreg narrow strip to avoid the foaming film and the prepreg narrow strip from sticking and contaminating the prepreg narrow strip. The foaming film is rich in bubbles, and can provide a buffer to reduce the extrusion of the prepreg narrow strip when impacted by an external force. The second protective film is a protective film located in the outermost layer, which is used to prevent the prepreg from being physically damaged, polluted or chemically eroded during transportation and storage, and to maintain the shape (flatness and integrity) of the prepreg. The second protective film is usually made of a thermoplastic material with high mechanical strength and good thermal stability. The second protective film can be placed in a plastic sealing machine with the prepreg for heating and plastic sealing and then cooled to shape the prepreg.

[0065] There is an air gap between the foaming film and the second protective film, and the air gap can provide a buffer when the prepreg is impacted by an external force, so as to reduce the degree of deformation of the prepreg narrow strip caused by the impact, thereby reducing the generation of hair due to deformation. In one example, the foaming film and the second protective film can be coated in sequence under a vacuum environment, and then a small amount of gas is filled between the foaming film and the second protective film to form an air gap between the foaming film and the second protective film. In another example, the foaming film and the second protective film can be coated in sequence in an atmospheric environment, part of the gas between the foaming film and the second protective film is discharged, and then the second protective film is sealed, and the air retained between the foaming film and the second protective film forms an air gap.

[0066] In an embodiment of the present application, after the prepreg is slitting and rewinding, a first protective film, a foaming film and a second protective film are sequentially coated on the surface of the prepreg, so that the first protective film can fit with the surface of the prepreg to define a smaller extrusion deformable space; and the foaming film and the air gap formed between the foaming film and the second protective film can provide a buffer, thereby reducing the degree of deformation of the prepreg caused by external extrusion during storage and transportation, which is beneficial to reducing the fuzz rate on the surface of the prepreg and improving the yield and quality of the prepreg and its products.

[0067] In some embodiments, this embodiment is a further description of step S130 in the above embodiment, and sequentially coating the surface of the prepreg narrow tape with a first protective film, a foaming film, and a second protective film may include the following steps:

[0068] Step S131 : sequentially coating the surface of the prepreg narrow tape with a first protective film and a foaming film.

[0069] In this step, the first protective film and the foaming film can be coated on the surface of the prepreg tape manually or automatically. During the coating of the first protective film, the shape of the first protective film can be adjusted to ensure that the first protective film fits the surface of the prepreg tape.

[0070] Step S132: putting the prepreg narrow strip covered with the first protective film and the foaming film into a packaging bag made of the second protective film.

[0071] In this step, the second protective film may be arranged as a packaging bag having an opening, and the prepreg narrow tape covering the first protective film and the foaming film may be placed into the packaging bag through the opening.

[0072] Step S133 , exhausting part of the gas between the foaming film and the second protective film to form an air gap between the foaming film and the second protective film.

[0073] In this step, the gas can be discharged by any of manual squeezing, machine squeezing, and suction using a negative pressure device.

[0074] Step S134: sealing the opening of the packaging bag made of the second protective film.

[0075] In this step, the second protective film is a plastic sealing film made of thermoplastic material, and a plastic sealing machine can be used to seal the opening of the second protective film.

[0076] In some embodiments, this embodiment is a further description of step S120 in the above embodiment. After the prepreg narrow tape is rewound onto the winding drum, the method for preparing the prepreg shaft further includes the following steps:

[0077] Step S121, a sealing plug is provided at the end of the coil drum in the axial direction.

[0078] In this step, the reel is cylindrical so that it can be easily mounted on the output shaft of the winding device. However, the cylindrical structure will result in insufficient structural strength of the reel, making it impossible for the reel to provide reliable support for the prepreg tape. For example, the reel may be easily deformed when the prepreg tape is accumulated or impacted by external force. Therefore, after the first protective film is coated, a sealing plug may be provided at the end of the reel. The sealing plug can provide structural reinforcement for the reel and improve its impact resistance.

[0079] In addition, the sealing plug can also fix the first protective film and the foaming film, reduce the squeezing force of the first protective film and the foaming film on the prepreg narrow strip, and improve the packaging efficiency.

[0080] In some embodiments, this embodiment is a further description of step S120 in the above embodiment. Rewinding the prepreg narrow tape onto a reel may include the following steps:

[0081] Step S122: When rolling up the prepreg narrow tape, use a separator film to cover a single prepreg narrow tape.

[0082] In this step, during the winding process, a separator film can be simultaneously covered on the upper and lower surfaces of the prepreg tape, and the separator film can separate two adjacent layers of the prepreg tape to prevent the adjacent prepreg tapes from adhering to each other through the internal resin. The separator film includes but is not limited to polyester film (PET) and polyethylene (PE).

[0083] In one example, see Figure 6 , the width of the separation membrane 20 ( Figure 6 The width of the prepreg tape 10 is 2.5 mm to 3.5 mm larger than the width of the single prepreg tape 10 (in the x direction shown in FIG), and the thickness of the separator 20 is about 0.09 mm to 0.11 mm. Under this size, two adjacent separators 20 have an overlap area 21 of suitable width to ensure uniformity of the coating while reducing the gap between the layers, thereby reducing the extrusion deformation space and further reducing the occurrence of hair.

[0084] In an exemplary embodiment, this embodiment provides a method for preparing a prepreg shaft, such as Figure 2 As shown, the method for preparing the prepreg shaft comprises the following steps:

[0085] Step S210: providing wide-width prepreg.

[0086] The implementation method and principle of this step are the same as those of step S110 in the aforementioned embodiment, and will not be described in detail.

[0087] Step S220: slitting the wide prepreg into a plurality of prepreg narrow strips, and rewinding the prepreg narrow strips onto a reel.

[0088] The implementation method and principle of this step are the same as those of step S120 in the aforementioned embodiment, and will not be described in detail.

[0089] Step S230: sequentially covering the surface of the prepreg narrow strip with a first protective film, a foaming film and a second protective film, with an air gap between the foaming film and the second protective film, to obtain a prepreg shaft.

[0090] The implementation method and principle of this step are the same as those of step S120 in the aforementioned embodiment, and will not be described in detail.

[0091] Step S240: placing the packaged prepreg narrow tape in a first preset environment and storing it for a preset time.

[0092] In this step, the first preset environment includes a first temperature, the first temperature is less than -12°C, and the prepreg tape and the first protective film, foaming film, second protective film and separator film used to encapsulate the prepreg tape can be shaped in a low temperature environment.

[0093] Step S250: Transfer the prepreg narrow tape to a second preset environment and thaw it until there is no condensed water on the surface of the second protective film.

[0094] In this step, when the prepreg narrow tape is required for industrial production, step S250 can be performed. The purpose of performing step S250 is not limited to this. For example, the surface of the prepreg sample can be sampled to detect the hair condition, and the parameters of the previous process steps such as slitting, rewinding, and packaging can be adjusted according to the hair condition until a product with qualified hair condition is prepared.

[0095] In one example, the second preset environment includes a second temperature and a first humidity, the second temperature is 18° C.-25° C., and the first humidity is 25%-65% RH.

[0096] Step S260: removing the second protective film, the foaming film and the first protective film.

[0097] In this step, scissors can be used to open the second protective film and remove the foaming film. Since the first protective film can be fixed by the sealing plug, the first protective film can be quickly removed after removing the sealing plug.

[0098] Step S270: sampling at a preset position of the prepreg narrow tape to count the number of hair fibers.

[0099] In this step, the narrow tape is pre-preg at predetermined positions, such as edge positions and middle positions along the axial direction of the reel.

[0100] In some embodiments, this embodiment is a further description of step S120 and step S220 in the above-mentioned embodiment, and rewinding the prepreg narrow tape onto the reel may include the following steps:

[0101] The prepreg narrow tape is spirally wound onto a reel at a preset winding-induction ratio.

[0102] In this step, spiral winding can form a prepreg tape with a spiral structure, thereby forming a denser isolation layer and reducing the infiltration of oxygen and moisture from the edge of the prepreg tape. In addition, the adjacent layers of the prepreg tape with a spiral structure are staggered and stacked to avoid adhesion after rewinding.

[0103] In this step, the preset indentation ratio may be 0.2 mm / 2 layer-0.3 mm / 2 layer. In one example, the preset locking ratio may be 0.2 mm / 2 layer. In this embodiment, the use of a small indentation ratio (0.2 mm / 2 layer-0.3 mm / 2 layer) can effectively reduce the hair phenomenon and improve the quality of the prepreg narrow tape.

[0104] The preparation method provided in this embodiment can be used to make prepreg shaft samples, that is, the prepreg shaft samples are test samples used to debug parameters such as slitting and rewinding before preparing large quantities of prepreg shafts. By detecting the fuzz rate on the prepreg shaft samples made with different slitting and rewinding parameters, the optimal parameters can be determined and then large quantities of prepreg shafts can be prepared based on the optimal parameters.

[0105] Taking a prepreg narrow tape with a width of 6.35 mm as an example, the preparation method provided in this embodiment is tested as follows by controlling variables:

[0106] Example 1: Large winding-indentation ratio (see Figure 4 The larger winding indentation ratio shown is the material axis 100b) and the wider separator film (see Figure 7 ).

[0107] The winding indentation ratio is 1 mm / 2 layers, the unwinding and winding speeds are both 10 m / min, the width of the separator film is 12.5 mm, and the thickness of the separator film is 0.1 mm. In this embodiment, the frequency of hairs of the prepreg narrow tape at the edge of the winding drum is 37 places / 50 cm, and the frequency of hairs of the prepreg narrow tape at the middle of the winding drum is 12 places / 50 cm.

[0108] Example 2: Large winding-indentation ratio (see Figure 4 ) and a separator of moderate width (see Figure 6 ).

[0109] The winding indentation ratio is 1 mm / 2 layers, the unwinding and winding speeds are both 10 m / min, the width of the separator film is 10 mm, and the thickness of the separator film is 0.1 mm. In this embodiment, the frequency of hairs of the prepreg narrow tape at the edge of the winding drum is 10 locations / 50 cm, and the frequency of hairs of the prepreg narrow tape at the middle of the winding drum is 5 locations / 50 cm.

[0110] Example 3: Large winding-indentation ratio (see Figure 4 ) and narrower separators (see Figure 5 ).

[0111] The winding indentation ratio is 1 mm / 2 layers, the unwinding and winding speeds are both 10 m / min, the width of the separator film is 7.5 mm, and the thickness of the separator film is 0.1 mm. In this embodiment, the frequency of hairs of the prepreg narrow tape at the edge of the winding drum is 19 locations / 50 cm, and the frequency of hairs of the prepreg narrow tape at the middle of the winding drum is 14 locations / 50 cm.

[0112] Example 4: Small winding indentation ratio (see Figure 3 The small winding indentation shown is larger than the material axis 100a) and the wider separator film (see Figure 7 ).

[0113] The winding indentation ratio is 0.25 mm / 2 layers, the unwinding and winding speeds are both 10 m / min, the width of the separator film is 12.5 mm, and the thickness of the separator film is 0.1 mm. In this embodiment, the frequency of hairs of the prepreg narrow tape at the edge of the winding drum is 13 places / 50 cm, and the frequency of hairs of the prepreg narrow tape at the middle position of the winding drum is 7 places / 50 cm.

[0114] Example 5: Small winding indentation ratio (see Figure 3 ) and a separator of moderate width (see Figure 6 ).

[0115] The winding indentation ratio is 0.25 mm / 2 layers, the unwinding and winding speeds are both 10 m / min, the width of the separator film is 10 mm, and the thickness of the separator film is 0.1 mm. In this embodiment, the frequency of hairs of the prepreg narrow tape at the edge of the winding drum is 3 / 50 cm, and the frequency of hairs of the prepreg narrow tape at the middle of the winding drum is 0 / 50 cm.

[0116] Example 6: Small winding indentation ratio (see Figure 3 ) and narrower separators (see Figure 5 ).

[0117] The winding indentation ratio is 0.25 mm / 2 layers, the unwinding and winding speeds are both 10 m / min, the width of the separator film is 7.5 mm, and the thickness of the separator film is 0.1 mm. In this embodiment, the frequency of hairs of the prepreg narrow tape at the edge of the winding drum is 11 places / 50 cm, and the frequency of hairs of the prepreg narrow tape at the middle of the winding drum is 8 places / 50 cm.

[0118] Through the analysis of multiple embodiments, it can be determined that by using a smaller winding indentation ratio (0.2mm / 2 layers-0.3mm / 2 layers) and a separator with a moderate width (the separator width is 2.5mm-3.5mm larger than the width of a single prepreg narrow strip) in Example 5, a prepreg shaft with the lowest fuzz rate can be prepared.

[0119] According to an exemplary embodiment of the present disclosure, Figures 3 to 7 As shown, this embodiment provides a prepreg shaft, which includes a winding drum and a prepreg narrow strip, and a first protective film, a foaming film and a second protective film sequentially coated on the surface of the prepreg narrow strip.

[0120] Among them, Figure 3 and Figure 4 As shown, the reel is in the shape of a hollow cylinder, the inner wall of the hollow cylinder is used to be installed on the rotating shaft of the winding device, the prepreg narrow tape is wound on the outer surface of the hollow cylinder, and the rotating shaft of the winding device drives the reel to rotate so that the prepreg narrow tape is wound on the reel. The reel in this embodiment can be a reel of any size and model in the related art, and no further details are given.

[0121] like Figures 3 to 7 As shown, the prepreg narrow strip is a prepreg narrow strip with a smaller width formed by slitting a wide prepreg shaft. The size of the prepreg narrow strip can be adaptively set according to actual needs. The width of the prepreg narrow strip includes but is not limited to 27mm, 12.7mm and 6.36mm.

[0122] The first protective film can be a polyethylene (PE) film. There is no chemical reaction between the polyethylene film and the resin matrix of the prepreg tape, so that the first protective film and the prepreg tape can be prevented from being adhered or contaminated. The polyethylene film has a smooth and hydrophobic surface, which is convenient for subsequent peeling. In addition, the polyethylene film also has a high elastic modulus, which can closely fit the surface of the prepreg tape to avoid wrinkles and bubbles. In addition, the polyethylene film can withstand the processing temperature of the prepreg tape to avoid deformation or melting at high temperatures.

[0123] The foam film can be foam paper. Foam paper is light, soft, durable, heat-insulating and moisture-proof. When the prepreg shaft is impacted by foreign objects, the bubbles in the foam paper can provide a buffering effect to reduce the deformation of the prepreg narrow strip.

[0124] The second protective film may be a plastic film, which has been explained in the above embodiments and will not be described again here.

[0125] In some embodiments, Figures 5 to 7 As shown, the prepreg shaft also includes a separator, which covers the surface of the prepreg tape and is located between adjacent prepreg tapes, and can prevent the adjacent layers of the prepreg tape from sticking together due to resin residue or semi-cured state after winding, ensure neat rewinding, and facilitate unwinding for subsequent use; and the separator can also prevent the prepreg tape from directly contacting the structures in the slitting device and the winding device, reducing friction that causes damage and hair on the prepreg tape. The separator can be a polyethylene film, and the effect of the polyethylene film has been explained in the previous embodiment and will not be repeated.

[0126] Among them, Figure 3 and Figure 4 As shown, the prepreg shaft also includes a sealing plug (not shown in the drawings), which is arranged in the axial direction of the winding drum ( Figure 3 and Figure 4 The sealing plug is used to seal the opening at the end of the coil drum and provide support for the coil drum to reduce the deformation of the prepreg shaft when it is impacted by foreign objects. The sealing plug can be made of plastic, rubber and other materials, without further limitation.

[0127] In addition, since the step of setting the sealing plug precedes the step of coating the first protective film and other film layers, when coating the first protective film, the foaming film and the second protective film, the fixed positions of the first protective film, the foaming film and the second protective film can be set on the fixing plug to prevent the packaging film layer from squeezing the prepreg tape and causing the prepreg tape to produce hair. In one example, after the surface of the prepreg tape is coated with the first protective film, the free end of the first protective film can be gathered to the axial end of the reel, and then the sealing plug can be installed at the end of the reel. The sealing plug can fix the first protective film while blocking the opening at the end of the reel.

[0128] Those skilled in the art will appreciate that all or part of the steps in the above method can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium, such as a read-only memory, a disk, or an optical disk. Optionally, all or part of the steps in the above embodiment can also be implemented using one or more integrated circuits, and accordingly, each module / unit in the above embodiment can be implemented in the form of hardware or in the form of software function modules. The present invention is not limited to any specific form of combination of hardware and software.

[0129] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the technical means applied herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary technical means in the art that are not applied for by the present application. The specification and examples are considered to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0130] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A method for preparing a prepreg shaft, characterized in that: include: Provide wide width prepreg; Cutting the wide prepreg into a plurality of prepreg narrow strips, and rewinding the prepreg narrow strips onto a winding drum; A first protective film, a foaming film and a second protective film are sequentially coated on the surface of the prepreg narrow tape, with an air gap between the foaming film and the second protective film, so as to obtain a prepreg shaft.

2. The method for preparing a prepreg shaft according to claim 1, characterized in that: The method of sequentially coating the surface of the prepreg narrow tape with a first protective film, a foaming film and a second protective film comprises: Sequentially covering the surface of the prepreg narrow tape with the first protective film and the foaming film; Putting the prepreg narrow tape covered with the first protective film and the foaming film into a packaging bag made of the second protective film; exhausting part of the gas between the foaming film and the second protective film to form the air gap between the foaming film and the second protective film; The opening of the packaging bag made of the second protective film is sealed.

3. The method for preparing a prepreg shaft according to claim 1 or 2, characterized in that: After the prepreg narrow tape is rewound onto a reel, the method further comprises: A sealing plug is provided at the end of the coil barrel in the axial direction.

4. The method for preparing a prepreg shaft according to claim 1, characterized in that: The step of rewinding the prepreg narrow tape onto a reel comprises: When the prepreg narrow tape is rolled up, a separator film is used to cover a single prepreg narrow tape.

5. The method for preparing a prepreg shaft according to claim 4, characterized in that: The width of the separator film is 2.5 mm to 3.5 mm larger than the width of a single prepreg tape; and / or The thickness of the separation membrane is 0.09 mm-0.11 mm.

6. The method for preparing a prepreg shaft according to claim 1, characterized in that: The step of rewinding the prepreg narrow tape onto a reel comprises: spirally winding the prepreg narrow tape onto the winding drum at a preset winding induction ratio; Wherein, the preset indentation ratio is 0.2mm / 2 layers-0.3mm / 2 layers.

7. The method for preparing a prepreg shaft according to claim 1, characterized in that: After the surface of the prepreg narrow tape is sequentially coated with a first protective film, a foaming film, and a second protective film, the preparation method further comprises: placing the packaged prepreg narrow tape in a first preset environment and storing it for a preset period of time; Transferring the prepreg narrow tape to a second preset environment and thawing it until there is no condensed water on the surface of the second protective film; removing the second protective film, the foaming film and the first protective film; Sampling is performed at a preset position of the prepreg narrow tape to count the number of hair fibers.

8. The method for preparing a prepreg shaft according to claim 1 or 7, characterized in that: The first preset environment includes a first temperature, and the first temperature is less than -12°C; and / or, The second preset environment includes a second temperature, and the second temperature is 18-26° C.; and / or, The second preset environment includes a first humidity, and the first humidity is 25%-65% RH.

9. A prepreg shaft, characterized in that: include: Coil drum; A prepreg narrow tape wound on the outer peripheral surface of the winding drum; sequentially covering the prepreg narrow tape with a first protective film, a foaming film, and a second protective film; There is an air gap between the foaming film and the second protective film.

10. The prepreg shaft according to claim 9, characterized in that The prepreg shaft also includes: a separator film connected to the prepreg tape; and / or A sealing plug is arranged at the end of the winding barrel in the axial direction.

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