TWI835073B - A continuous fiber strip and manufacturing method thereof - Google Patents

Abstract

The present invention reveals a manufacturing method for a continuous fiber strip with the steps comprising of: ranging a purtily of spread continuous fiber in an annular parallelly along a first direction; forming a prepreg fiber by spreading a power-type thermoplastic resin to on the surface of continuous fiber and a gap between each of the continuous fiber; providing a heating temperature and a pultrusion to make the prepreg carbon fiber become a continuous fiber tube with a single direction structure.

Description

Strip continuous fiber and its forming method

A continuous fiber production method, especially a strip continuous fiber and its forming method

The well-known carbon fiber has good high temperature resistance, tensile strength, corrosion resistance, impact resistance, good electrical and thermal conductivity, and the advantages of small size and light weight, making this carbon fiber a popular preferred application material in various fields. In the current technology, the manufacturing method of a carbon fiber tube is to stack and arrange a plurality of woven fiber cloths to form a carbon fiber tube body with multiple layers of the fiber cloths, and then apply, pour, or pre-impregnate a heated liquid resin to the carbon fiber tube body, and finally apply pressure to make the fiber cloths of the pre-impregnated carbon fiber tube body compact, and solidify after cooling to form the carbon fiber tube.

However, the above-mentioned production method requires the preparation of a large amount of the resin to ensure that the entire carbon fiber pipe body can be covered with the resin, and it is impossible to accurately control the carbon fiber pipe by coating, pouring, pouring or pre-impregnation. The content of the resin is too high, and the fiber cloth located in the inner layer is often unable to be completely impregnated with the resin, resulting in too much resin residue, a waste of resources and costs, and incomplete pre-impregnation is more likely to cause the carbon fiber to The structural strength of the pipe is insufficient and the quality cannot be controlled. In view of this, developing a technology that can control the content of the resin in the carbon fiber pipe, overcome the problem of wasting cost resources, and improve the quality of the carbon fiber pipe is an urgently needed development goal in the current industry.

In order to develop a technology that can control the content of the resin in the carbon fiber pipe, overcome the problem of wasting cost resources, and improve the quality of the carbon fiber pipe, the present invention provides a strip continuous fiber forming method, the steps of which include: providing a tensile force to move toward a A plurality of continuous fiber yarn bundles advancing in one direction expand into a plurality of continuous fiber yarns, each of which is centered around a movement axis and arranged at parallel intervals toward a first direction; using powdered A thermoplastic resin is coated on the continuous fiber yarn so that the thermoplastic resin is evenly distributed on the surface of the continuous fiber yarn and between the continuous fiber yarns to form a prepreg material; a heating temperature is given to the prepreg material so that The thermoplastic resin melts corresponding to the heating temperature, and is extruded from the prepreg through a pultrusion force. After the pulling and extrusion, a free end is formed into a strip of continuous fiber, wherein: the strip of continuous fiber corresponds to the continuous fiber yarn The wires are arranged along the first direction to form strips with a single structural direction.

Wherein, a second fiber is provided on at least part of the surface of the strip-shaped continuous fiber, the second fiber extends toward at least a second direction, and there is an included angle between the second direction and the first direction.

, applying a processing pressure and a processing temperature to at least a part of the strip-shaped continuous fiber, the thermoplastic resin contained in at least a part of the strip-shaped continuous fiber is melted by the processing heat temperature and concavely formed corresponding to the processing pressure.

A plurality of the second fibers and a plurality of the third fibers are braided with each other using the strip-shaped continuous fiber as the core material and wrapped around at least a part of the strip-shaped continuous fiber. After the heating temperature and the pressure And form an integrated structure after cooling.

Further, the continuous fiber yarn is introduced into an impregnated space covered with the thermoplastic resin, and an air flow is passed toward the impregnated space, so that the thermoplastic resin generates a fluidization phenomenon and is evenly distributed on the surface of the continuous fiber yarn and between each continuous fiber yarn.

Further, an electrostatic field is provided to cause the thermoplastic resin to be sprayed toward the continuous fiber yarn while carrying a charge, so that the thermoplastic resin with the charge is evenly adsorbed on the surface of each continuous fiber yarn and each continuous fiber yarn. between.

The invention also provides a strip-shaped continuous fiber, including a plurality of continuous fiber yarns arranged in parallel and at intervals along a first direction, and a thermoplastic resin for solidifying and shaping the plurality of continuous fiber yarns, wherein the strip-shaped Continuous fibers are strips with a single structural direction.

The strip continuous fiber forming method provided by the present invention has the following advantages:

1. Adjust the distance between the continuous fiber yarns as required to improve the control of the thermoplastic resin content per unit volume and effectively control the diameter and thickness of the strip-shaped continuous fibers.

2. By expanding the continuous fiber yarns, the thermoplastic resin can penetrate into each of the continuous fiber yarns and achieve a full impregnation effect, thereby avoiding the situation of dry yarn inside the finished product.

3. The thermoplastic resin powder dropped during the impregnation step can be recycled and screened before being reused to maximize resource utilization and save costs.

4. Secondary forming and reprocessing procedures can be carried out in specific areas according to needs, resulting in flexible and diversified processing.

5. The strip-shaped continuous fiber can be reprocessed, which overcomes the problem of high cost caused by the traditional process of strip-shaped, plate-shaped or tubular products with curved structures that need to be made one by one with different molds. The steps are simple and The practicality of automated mass production will help expand the production and application of this fiber.

10: Continuous fiber yarn bundle

11:Continuous fiber yarn

12: Prepreg material

13: Strip continuous fiber

13A: Second strip of continuous fiber

14:Second fiber

15:Third fiber

20: Yarn guide device

21:Adjustable guide rod

30: Impregnation device

31:Immersion space

32: Loading board

321: Air guide hole

40:Pultrusion equipment

41:Extrusion device

42: Traction device

50:Knitting machine

A: Direction of movement

P: Thermoplastic resin

Figure 1 is a schematic flow diagram of a preferred embodiment of the present invention.

Figure 2 is a schematic diagram of the system according to the preferred embodiment of the present invention.

Figure 3 is a schematic three-dimensional view of a preferred embodiment of the present invention.

Figure 4 is a schematic diagram of secondary forming according to the preferred embodiment of the present invention.

Please refer to Figures 1 and 2, which illustrate a preferred embodiment of the strip continuous fiber forming method provided by the present invention. The steps include:

S1, arrange and introduce a plurality of continuous fiber yarn bundles 10: provide a tension to move the plurality of continuous fiber yarn bundles 10 toward a movement direction A, and expand each continuous fiber yarn bundle 10 through the adjustment of the tension, so that each continuous fiber The yarn bundle 10 expands into a plurality of continuous fiber yarns 11. Each of the continuous fiber yarns 11 runs corresponding to the movement direction A, surrounds a movement axis as the center, and is arranged at intervals extending in parallel toward a first direction. , and the first direction is in the same direction as the movement direction A.

The continuous fiber yarn bundle 10 can be made of man-made fiber, mineral fiber or polymer fiber. Preferably, the continuous fiber yarn bundle 10 can be made of glass fiber, carbon fiber or Kevlar fiber material. made. The continuous fiber yarn bundle 10 can be in the form of a single fiber yarn bundle or multiple fiber yarn bundles. After the continuous fiber yarn bundle 10 is expanded, the distance between the continuous fiber yarns 11 can be adjusted as needed, and the distance between the continuous fiber yarn bundles 11 can be adjusted as needed. The distance between the continuous fiber yarn 11 and the axis of movement reaches the required size. The distance between the continuous fiber yarns 11 can affect the content of the thermoplastic resin P when the thermoplastic resin P is subsequently coated. That is, the continuous fiber yarns can be controlled by the distance between the continuous fiber yarns 11. The ratio of line 11 to the thermoplastic resin P.

In this embodiment, the continuous fiber yarn bundles 10 are respectively installed on a yarn guide device 20. Preferably, the yarn guide device 20 includes a plurality of adjustable guide rods 21, and each of the continuous fiber yarn bundles is respectively Mounted on each adjustable guide rod 21, and using the adjustable guide rod 21 to drive each continuous fiber yarn bundle 10 forward toward the movement direction A, and adjust the tension so that each continuous fiber yarn bundle 10 expands, each of the continuous fiber yarn bundles 10 can be The adjustable guide rod 21 adjusts its relative position to the movement axis as required, so that each continuous fiber yarn 11 is arranged according to the required size.

S2, impregnate the continuous fiber yarn 11: use the powdered thermoplastic resin P to coat the continuous fiber yarn 11, so that the thermoplastic resin P is evenly distributed on the surface of the continuous fiber yarn 11 and each continuous fiber yarn. 11 to form a prepreg material 12 and pre-arrange the prepreg material 12, wherein the cross section formed by the prepreg material 12 corresponding to the arrangement position of the continuous fiber yarns 11 along the first direction may be solid. Strip, plate or hollow tube.

The present invention provides a first preferred embodiment for impregnating the continuous fiber yarn 11. Corresponding to the movement direction A, an impregnation device 30 is provided. The impregnation device 30 includes an impregnation space 31 equipped with the powdered thermoplastic resin P. And the continuous fiber yarn 11 can be introduced therein. A bearing plate 32 below the thermoplastic resin P is preferably provided with a plurality of air guide holes 321 so that an airflow B passes through the plurality of air guide holes 321 toward the impregnation space 31. When the airflow B passes through the plurality of air guide holes 321 When the thermoplastic resin P moves like a fluid, a fluidization phenomenon occurs, and the thermoplastic resin P can be evenly distributed in the prepreg material 12 .

Preferably, the impregnation device 30 can include a vibration mechanism. For example, the bearing plate 32 can exhibit a left-right vibration effect. When the airflow B passes into the impregnation space 31, the bearing plate 32 vibrates, which helps to maintain the thermoplasticity. Resin P fluidizes and reduces buildup. Or a stirring device can be provided to stir the thermoplastic resin P to achieve the same purpose as above.

Please refer to the figure. In the second preferred embodiment of the present invention, an electrostatic field is provided to impregnate the continuous fiber yarns 11 so that the thermoplastic resin P can be evenly adsorbed between the continuous fiber yarns 11 . An electrostatic spraying device is used to spray the thermoplastic resin P toward the continuous fiber yarn 11. While the thermoplastic resin P passes through the electrostatic spraying device, the electrostatic spraying device causes the thermoplastic resin to The grease P carries a charge, and the thermoplastic resin P carrying the charge will be adsorbed on the surface of each continuous fiber yarn 11 and between each continuous fiber yarn 11 under the action of static electricity.

Furthermore, the electrostatic spraying device can make the thermoplastic resin P charged through a frictional static electricity or a high-voltage static electricity. Taking tribostatic electricity as an example, when the thermoplastic resin P passes through a spray gun of the electrostatic spraying device, the thermoplastic resin P carries a positive charge due to friction with the gun barrel wall, and is adsorbed on the surface of the continuous fiber yarn 11 or on each other. between the continuous fiber yarns 11. The thickness formed by the thermoplastic resin P can be adjusted by adjusting the volume and speed of the thermoplastic resin P passing through the barrel wall.

Taking the high-voltage electrostatic as an example, the electrostatic spraying device is a spray gun that passes high voltage, so that a high-voltage electrostatic field is generated between the electrostatic spraying device and the continuous fiber yarn 11. When the thermoplastic resin P passes through the electrostatic spraying device When , the thermoplastic resin P absorbs a negative charge and is adsorbed on the continuous fiber yarn 11. The amount of the thermoplastic resin P adsorbed on the surface of the continuous fiber yarn 11 or between the continuous fiber yarns 11 can be determined by the The electric field strength of the high-voltage electrostatic field, the air pressure and the powder concentration of the thermoplastic resin P are determined. As the amount of spraying of the thermoplastic resin P increases, the accumulation of the charge also increases. When the thermoplastic resin P reaches a certain When the thickness increases, an electrostatic repulsion occurs, and the thermoplastic resin P will no longer be adsorbed at this time, so that the prepreg 12 can obtain a uniform thickness of the thermoplastic resin P.

S3, forming a strip of continuous fiber 13: given a heating temperature and a pultrusion force to the prepreg 12, the thermoplastic resin P of the prepreg 12 melts corresponding to the heating temperature, and the prepreg 12 melts corresponding to the pultrusion force. The impregnated material 12 is extruded and combined with the method of pulling one free end of the extruded strip-shaped continuous fiber 13 so that the strip-shaped continuous fiber 13 can be continuously formed according to the movement direction A.

In this embodiment, a pultrusion device 40 is provided along the movement direction A. Both ends of the pultrusion equipment 20 along the movement direction A include an extrusion device 41 and a traction device 42 adjacent to the impregnation device 30 respectively. , the prepreg 12 is extruded through the extrusion device 41 and passes through the pulling device 42 pulls the free end after extrusion, so that the strip-shaped continuous fiber 13 can be formed through a continuous pultrusion action.

Please refer to Figure 3. After step S3, since the plurality of continuous fiber yarns 11 in the strip-shaped continuous fiber 13 are all arranged in parallel in the first direction around the axis of movement, the strip-shaped strip after cooling and setting is The continuous fibers 13 are in the shape of solid strips, plates or hollow tubes with a single structural direction. In the preferred embodiment of the present invention, the strip-shaped continuous fibers 13 are in the shape of hollow tubes.

S4, secondary forming: a second fiber 14 is provided on at least part of the surface of the strip-shaped continuous fiber 13. Wherein, the second fiber 14 extends towards at least a second direction, and there is an included angle between the second direction and the first direction, so that the strip-shaped continuous fiber 13 can be strengthened after being disposed through the second fiber 14 Overall structural rigidity. The material of the second fiber is not limited to be the same as or different from the continuous fiber yarn bundle 10 .

The first preferred embodiment of the secondary processing provided by the present invention is to wind at least one layer of the second fiber 14 pre-impregnated in the thermoplastic resin around at least a part of the strip-shaped continuous fiber 13, Then, the heating temperature is provided and a pressure is applied. The thermoplastic resin P melts corresponding to the heating temperature, so that at least one layer of the second fiber 14 can be pressed and compacted with the surface of the continuous fiber 13 in accordance with the pressure, and is cooled. Finally, an integrated second strip-shaped continuous fiber 13A is formed. When the second fiber 14 has a multiple-layer structure, the second fiber 14 between each layer can also be melted and pressed in this step to enhance the overall structural strength.

Please refer to Figure 4, which is a second preferred embodiment of the secondary processing provided by the present invention. A plurality of second fibers 14 and a plurality of third fibers 15 are interconnected with the strip-shaped continuous fiber 13 as the core material. The second strip-shaped continuous fiber 13A is formed into an integrated second strip-shaped continuous fiber 13A after being braided and wrapped around at least a portion of the strip-shaped continuous fiber 13 and subjected to the heating temperature, the pressure and cooling. As mentioned previously, the second fiber 14 and/or the third fiber 15 are not limited to the same or different materials as the continuous fiber yarn bundle 10 .

In this implementation, a knitting machine 50 is provided along the movement direction A. The knitting machine 50 includes a circular frame, and the axis of the circular frame corresponds to the movement axis. A plurality of the second fibers are 14 and a plurality of third fibers 15 are arranged at intervals in the circular frame, and extend radially to the circular frame with the axis as the center. The outer ends of the plurality of second fibers 14 move along the inner diameter of the circular frame along a first path, and the outer ends of the plurality of third fibers 15 move along the circular frame along a second path, wherein, Each second fiber 14 and each third fiber 15 intersect with each other while moving along the circular frame.

During weaving, when the strip-shaped continuous fiber 13 moves to the position of the knitting machine 50 along the movement direction A, the strip-shaped continuous fiber 13 corresponds to the axis and abuts against the plurality of second fibers 14 located at the axis end and A plurality of third fibers 15, as the strip-shaped continuous fibers 13 pass through the circular frame, each second fiber 14 and each third fiber 15 intersect with each other due to moving along the circular frame, forming a The surface is woven and the strip-shaped continuous fiber 13 is wrapped. After the second strip-shaped continuous fiber 13A is formed, it has the second direction formed by the second fiber 14 and each of the third fibers 15, which not only increases the overall structural strength, but also automates the work process.

In accordance with the material properties of the thermoplastic resin P, the strip-shaped continuous fiber 13 (or the second strip-shaped continuous fiber 13A) can be reprocessed as required. A processing pressure and a processing temperature are applied to at least a part of the surface of the strip-shaped continuous fiber 13, so that the thermoplastic resin P contained in at least a part of the surface of the strip-shaped continuous fiber 13 is melted and processed by the processing heat temperature. Pressure concave curves should be machined.

The secondary processing method may be to place the strip-shaped continuous fiber 13 in a mold, or use a roller to roll on any part of the surface of the strip-shaped continuous fiber 13, and apply the processing pressure and the processing temperature.

The strip continuous fiber 13 forming method provided by the present invention has the following advantages:

1. Adjust the distance between the continuous fiber yarns 11 as required to improve the control of the thermoplastic resin P content per unit volume and effectively control the diameter of the strip-shaped continuous fiber 13.

2. By expanding the continuous fiber yarns 11, the thermoplastic resin P can penetrate into each of the continuous fiber yarns 11 and achieve a full impregnation effect, thereby avoiding the situation of dry yarn inside the finished product.

3. The thermoplastic resin P powder dropped during the impregnation step can be recycled and sieved for reuse, maximizing resource utilization and saving costs.

4. Secondary forming and reprocessing procedures can be carried out in specific areas according to needs, resulting in flexible and diversified processing.

5. The strip-shaped continuous fiber 13 can be reprocessed, which overcomes the problem in the traditional process that strip-shaped, plate-shaped or tubular products with curved structures need to be produced one by one with different molds, resulting in high costs. The steps are simple. And it has the practicality of automated mass production, which helps expand the production and application of this fiber.

Claims (7)

A strip continuous fiber forming method, the steps of which include: providing a force to expand a plurality of continuous fiber yarn bundles moving in a direction of movement into a plurality of continuous fiber yarns, each of the continuous fiber yarns is centered on an axis of movement. surrounding the center and arranged at parallel intervals in a first direction; using a powdered thermoplastic resin to carry a charge and coat the continuous fiber yarn so that the thermoplastic resin is evenly distributed on the surface of the continuous fiber yarn And between each continuous fiber yarn, a prepreg is formed, wherein the continuous fiber yarn is introduced into an impregnation space covered with the thermoplastic resin, and an air flow is passed toward the impregnation space, so that the thermoplastic resin Fluidization occurs and is evenly distributed on the surface of the continuous fiber yarns and between the continuous fiber yarns; giving the prepreg a heating temperature causes the thermoplastic resin to melt corresponding to the heating temperature, and through a pultrusion force The prepreg material is extruded, and a free end after the extrusion is pulled to form a strip of continuous fiber, wherein the strip of continuous fiber corresponds to the position of the continuous fiber yarn arranged along the first direction to form a single structural direction. The strip-shaped continuous fiber can be a solid strip or a hollow tube; and a second fiber is provided on at least part of the surface of the strip-shaped continuous fiber, and the second fiber faces at least a second direction. Extending, there is an included angle between the second direction and the first direction. The strip continuous fiber forming method as described in claim 1, wherein the continuous fiber yarn bundle can be made of glass fiber, carbon fiber or Kevlar fiber material. The strip continuous fiber forming method described in claim 1 provides an electrostatic field to cause the thermoplastic resin to be sprayed toward the continuous fiber yarn while carrying a charge, so that the thermoplastic resin with the charge is evenly adsorbed on each of the continuous fiber yarns. On the surface of fiber yarns and between each continuous fiber yarn. The method for forming strip-shaped continuous fibers as described in any one of claims 1 to 3, applying a processing pressure and a processing temperature to at least a part of the strip-shaped continuous fibers, and the strip-shaped continuous fibers are at least A portion of the thermoplastic resin contained is melted by the processing heat temperature and concavely formed in response to the processing pressure. The strip-shaped continuous fiber forming method according to any one of claims 1 to 3, including: winding at least one layer of the second fiber pre-impregnated in the thermoplastic resin around at least a part of the strip-shaped continuous fiber The outer periphery; providing the heating temperature and applying a pressure, at least one layer of the second fiber and the surface of the strip-shaped continuous fiber are fused and compacted, and formed into an integrated structure through cooling. The method for forming strip-shaped continuous fibers according to any one of claims 1 to 3, wherein a plurality of the second fibers and a plurality of third fibers are braided with each other and covered with the strip-shaped continuous fiber as a core material. At least a part of the outer periphery of the continuous fiber forms an integrated structure after being subjected to the heating temperature, the pressure and cooling. A strip-shaped continuous fiber produced by the method described in any one of claims 1 to 6.

Images