KR20230091638A - Impregnation apparatus and impregnation method - Google Patents

Abstract

Embodiments of the present invention relate to an impregnation device and an impregnation method, and the impregnation method according to an embodiment of the present invention is an impregnation method for supplying fibers and resin into an impregnation mold for impregnation, Resin is discharged from the upper or lower portion, a damage prevention passage is provided in the resin discharge section, and contact between fibers and the inner wall of the flow passage is prevented by the discharge pressure of the resin.

Description

Impregnation device and impregnation method {IMPREGNATION APPARATUS AND IMPREGNATION METHOD}

Embodiments of the present invention relate to an impregnation apparatus and an impregnation method.

Continuous fiber-reinforced composites have recently been in the limelight as industrial materials in relation to automobiles, aviation, electronics, construction, sports leisure and defense industries, and have the advantage of being able to change their composition relatively freely in the molding process.

Continuous fiber-reinforced thermoplastic composites are continuously produced by impregnating continuously supplied fibers with a thermoplastic resin and undergoing a curing or solidification process.

In particular, a fiber-reinforced unidirectional prepreg (Pre-Preg) is continuously produced by impregnating fibers in a thermoplastic resin in one direction. In addition, the fiber-reinforced unidirectional prepreg manufactured in this way is referred to as a UD sheet (Unidirectional Sheet).

UD sheet has excellent mechanical properties and is mainly used as a reinforcing material for parts with low physical properties of injection molded products.

A conventional UD sheet manufacturing apparatus includes a fiber supply unit having a bobbin for supplying fibers, a spreader for spreading fibers, an extruder for supplying resin, and an impregnation mold for impregnating fibers with resin. However, according to the conventional UD sheet manufacturing apparatus, it was difficult to design a high-speed UD sheet manufacturing line.

Therefore, it is possible to simultaneously manufacture UD sheets made of two types of fibers in a single UD sheet manufacturing line, or when one type of fiber is applied, the productivity of the UD sheet can be doubled High speed of the UD sheet manufacturing apparatus design is requested. And to this end, it is required to prevent fiber damage at high speed, and to design and improve the optimization of the impregnation passage section for this purpose.

Prior literature related to the present invention includes Republic of Korea Patent Publication No. 10-2016-0054661 (published on May 17, 2016), and in the prior literature, an apparatus and method for manufacturing a unidirectional continuous fiber-reinforced thermoplastic composite are disclosed. However, the unidirectional continuous fiber-reinforced thermoplastic composite manufacturing apparatus and method disclosed in the prior literature do not suggest anything about high-speed impregnation that can improve the productivity of the UD sheet and improve the production efficiency by at least two times in the same space.

An object of the present invention is to provide an impregnation device and an impregnation method capable of significantly improving the productivity of a fiber-reinforced unidirectional prepreg, that is, a UD sheet, through a single manufacturing line.

Another object of the present invention is to provide an impregnation device and an impregnation method capable of simultaneously manufacturing a fiber-reinforced unidirectional prepreg made of heterogeneous fibers, that is, a UD sheet through a single manufacturing line.

Another object of the present invention is to provide an impregnation device and an impregnation method that can improve the productivity of UD sheets by more than two times or simultaneously manufacture UD sheets made of heterogeneous fibers through a single production line.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention not mentioned above can be understood by the following description and will be more clearly understood by the examples of the present invention. It will also be readily apparent that the objects and advantages of the present invention may be realized by means of the instrumentalities and combinations indicated in the claims.

An impregnation method according to an embodiment of the present invention is an impregnation method in which fibers and resin are supplied into an impregnation mold to be impregnated, and resin is discharged from the upper or lower portion of the inlet of the flow path of the impregnation mold, and the resin is discharged in the discharge section. It is possible to prevent contact between the fiber and the inner wall of the flow passage by the discharge pressure of the resin by providing a damage prevention passage.

In the impregnation method according to an embodiment of the present invention, the damage prevention passage may include fine protrusions protruding from a wall surface close to the discharge direction of the resin.

In the impregnation method according to an embodiment of the present invention, a plurality of the fine projections may be provided, and the plurality of fine projections may protrude from each other at set intervals.

In the impregnation method according to an embodiment of the present invention, a flat surface may be formed on a wall surface opposite to the wall surface on which the micro-protrusions are provided (ie, a wall surface located far from the resin ejection position).

In addition, on the wall surface opposite to the wall surface on which the fine projections are provided (that is, the wall surface located at a distance from the resin dispensing position), it protrudes upward between the plurality of fine projections and has a radius of curvature greater than the radius of curvature of each of the plurality of fine projections. A wave protrusion having a radius of curvature may be provided.

The wave protrusion protrudes between the plurality of micro protrusions in the opposite direction to the plurality of micro protrusions, and the tip of the protruding part of the wave protrusion can contact and support the other surface of the fiber whose one surface is contacted and supported by the plurality of micro protrusions during high-speed impregnation. . In this way, the fibers can move while having a minimum contact area between the plurality of fine protrusions and the wave protrusions, so that damage due to friction of the fibers can be prevented.

For example, during high-speed impregnation, fibers may flow up and down while passing through a narrow channel. It is possible to prevent contact or friction with a wall surface within the flow path part and to prevent damage to fibers.

For example, the radius of curvature of the fine protrusions may be determined within a range of 1 to 10 mm. Preferably, the radius of curvature of the fine protrusions may be determined within a range of 2 to 8 mm.

In addition, the damage prevention passage may be located at the front end of the passage part with a length of 10 to 40% compared to the length of the wave-shaped main passage at the rear end within the length of the passage part of the impregnation mold.

In the impregnation method according to an embodiment of the present invention, the impregnation mold may be a coat-hanger type die.

Impregnation device according to an embodiment of the present invention, receiving the fiber and the resin, the impregnation mold for impregnating the resin into the fiber; And an extruder for supplying resin to the impregnation mold; including, wherein the extruder includes a resin discharge unit for discharging resin from an upper part or a lower part of the inlet of the flow path part of the impregnation mold; including, among the flow path parts of the impregnation mold, At a position corresponding to the resin discharge unit, a damage prevention passage may be provided to prevent contact between the fiber and an inner wall of the flow passage unit by a resin discharge pressure.

In the impregnation device according to an embodiment of the present invention, the damage prevention passage may include fine protrusions protruding from a wall surface close to a direction in which the resin is discharged.

In the impregnation device according to an embodiment of the present invention, a plurality of the fine projections are provided, and the plurality of fine projections may protrude at intervals from each other.

In the impregnation device according to an embodiment of the present invention, a flat surface may be formed on a wall surface opposite to the wall surface on which the micro-protrusions are provided (ie, a wall surface located far from the resin ejection position).

Alternatively, on a wall surface opposite to the wall surface on which the fine projections are provided (that is, a wall surface located at a distance from the resin ejection position), the curvature protrudes upward between the plurality of fine projections and has a greater curvature than the radius of curvature of each of the plurality of fine projections. A wave protrusion having a radius may be provided.

For example, the radius of curvature of the fine protrusions may be determined within a range of 1 to 10 mm. Preferably, the radius of curvature of the fine protrusions may be determined within a range of 2 to 8 mm.

In addition, the damage prevention passage may be located at the front end of the wave-type main passage with a length of 10 to 40% compared to the length of the wave-type main passage at the rear end within the length of the passage part of the impregnation mold.

In the impregnation device according to an embodiment of the present invention, the impregnation mold may be a coat-hanger type die.

In the impregnation device according to an embodiment of the present invention, a double impregnation mold unit including a first impregnation mold for impregnating a first fiber with a resin and a second impregnation mold for impregnating a second fiber with a resin; and a single shared extruder having resin supply lines individually connected to the first and second impregnation molds and supplying resin to the first and second impregnation molds.

In the impregnation device according to an embodiment of the present invention, the first impregnation mold and the second impregnation mold are stacked vertically and parallel to each other to receive resin from the shared extruder.

In this case, the first fiber and the second fiber may be the same fiber or different types of fibers.

In the impregnation device according to an embodiment of the present invention, the shared extruder includes a first resin supply line for supplying a resin to the first impregnation mold; a second resin supply line supplying resin to the second impregnation mold; a first resin supply nozzle connected to an end of the first resin supply line and having a first resin discharge part to inject resin into the first passage part of the first impregnation mold; and a second resin supply nozzle connected to the end of the second resin supply line and having a second resin discharge unit to inject resin into the second flow path of the second impregnation mold.

In the impregnation device according to an embodiment of the present invention, the first resin discharge unit discharges the resin from top to bottom toward the inlet of the first flow path, and the second resin discharge unit is directed toward the inlet of the second flow path. Resin can be discharged from bottom to top.

In the impregnating device according to an embodiment of the present invention, the first flow path portion may include a first wave-shaped main flow path for impregnating the first fiber with a resin; and a first damage preventing passage positioned in front of the first wave-shaped main passage and preventing damage to the non-impregnated portion of the first fiber when the first fiber is initially introduced. A plurality of first micro-protrusions protruding downward at an interval from each other at an upper end of the flow path and contacting an upper portion of the first fiber may be provided.

In the impregnation device according to an embodiment of the present invention, a flat surface is formed at the lower end of the first damage prevention passage, or protrudes upward between the plurality of first microprotrusions, and each of the plurality of first microprotrusions A first wave protrusion having a radius of curvature greater than the radius of curvature may be provided.

In the impregnating device according to an embodiment of the present invention, the second flow path portion may include a second wave-shaped main flow path for impregnating the second fiber with a resin; and a second damage preventing passage positioned in front of the second wave-shaped main passage and preventing damage to the non-impregnated portion of the second fiber when the second fiber is initially introduced. A plurality of second fine protrusions protruding upward at a distance from each other and contacting the lower portion of the second fiber may be provided at a lower end of the passage.

In the impregnation device according to an embodiment of the present invention, a flat surface is formed at the upper end of the second damage-preventing passage, or protrudes upward between the plurality of second fine projections, and each of the plurality of second fine projections A first wave protrusion having a radius of curvature greater than the radius of curvature may be provided.

In the impregnation device according to an embodiment of the present invention, each of the first impregnation mold and the second impregnation mold may be a coat-hanger type die.

According to the present invention, productivity of a fiber-reinforced unidirectional prepreg, that is, a UD sheet, can be significantly improved through a single manufacturing line.

In addition, according to the present invention, a fiber-reinforced unidirectional prepreg made of different types of fibers, that is, a UD sheet can be simultaneously manufactured.

Specifically, according to the present invention, a plurality of impregnation molds that are divided into upper and lower portions and each have individual passages and an extruder for supplying resin to the plurality of impregnation molds are used. Accordingly, productivity can be improved by about two times compared to the conventional one, and there is an advantage in that UD sheets made of heterogeneous fibers can be simultaneously manufactured.

In particular, the extruder has a large size in the UD sheet manufacturing line, and by using a single extruder in common, the production capacity of UD sheets can be increased by about two times using the same space as before, and the production efficiency can be greatly improved. there is.

In addition, according to the present invention, since a plurality of impregnation molds are arranged vertically and have a structure symmetrical to each other, equal impregnation properties can be expressed in the upper and lower sections.

In addition, according to the present invention, it is possible to prevent damage to unimpregnated fibers that may occur initially in a high-speed impregnation process by improving the flow path structure of each of a plurality of impregnation molds. For example, it is possible to prevent damage to unimpregnated fibers in advance through designing the flow path structure by forming fine protrusions in the straight section at the inlet side among the passages of each of the plurality of impregnation molds.

In addition, according to the present invention, uniform application of the resin in the width direction can be expected by adopting a coat hanger type resin application method.

In addition to the effects described above, specific effects of the present invention will be described together while explaining specific details for carrying out the present invention.

1 is a conceptual diagram of an impregnation apparatus including a double impregnation mold and a shared extruder according to an embodiment of the present invention.
2 is a conceptual diagram showing a first embodiment of an impregnation device including a double impregnation mold and a shared extruder according to an embodiment of the present invention.
3 is a conceptual diagram showing a second embodiment of an impregnation device including a double impregnation mold and a shared extruder according to an embodiment of the present invention.
FIG. 4 is a conceptual diagram showing fine protrusions and a flat surface of a first damage-preventing passage in the impregnation device shown in FIG. 3 .
FIG. 5 is a conceptual diagram showing fine protrusions and a flat surface of a second damage-preventing passage in the impregnation device shown in FIG. 3 .
6 is a conceptual diagram showing fine protrusions and flat surfaces of first and second damage prevention passages in the impregnation device shown in FIG. 3 .
FIG. 7 is a conceptual diagram showing fine protrusions and wave protrusions of the first damage-preventing passage in the impregnation device shown in FIG. 3 .
FIG. 8 is a conceptual diagram showing fine protrusions and wave protrusions of the second damage-preventing passage in the impregnation device shown in FIG. 3 .
9 is a conceptual diagram showing fine protrusions and wave protrusions of first and second damage prevention passages in the impregnation device shown in FIG. 3 .
10A, 10B, and 10C are diagrams schematically illustrating comparative examples in which an upper discharge method, a lower discharge method, and an upper and lower discharge method are applied to an impregnation mold having a single channel.
11 is a conceptual diagram briefly illustrating a coat hanger die method.
12 is a conceptual diagram of a continuous fiber-reinforced thermoplastic composite manufacturing apparatus using an impregnation apparatus according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings so that those skilled in the art can easily carry out the present invention. This invention may be embodied in many different forms and is not limited to the embodiments set forth herein.

In order to clearly describe the present invention, parts irrelevant to the description are omitted, and the same reference numerals are assigned to the same or similar components throughout the specification. In addition, some embodiments of the present invention are described in detail with reference to exemplary drawings. In adding reference numerals to components of each drawing, the same components may have the same numerals as much as possible even if they are displayed on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description may be omitted.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish the component from other components, and the nature, sequence, order, or number of the corresponding component is not limited by the term. When an element is described as being “connected,” “coupled to,” or “connected” to another element, that element is or may be directly connected to that other element, but intervenes between each element. It will be understood that may be "interposed", or each component may be "connected", "coupled" or "connected" through other components.

In addition, in implementing the present invention, components may be subdivided for convenience of explanation, but these components may be implemented in one device or module, or one component may be implemented in a plurality of devices or modules. It may be divided into and implemented.

[Impregnation device and impregnation method]

1 to 9 , according to an embodiment of the present invention, an impregnation device and an impregnation method for supplying and impregnating fibers or resin into the impregnation molds 410 and 420 are provided.

In the impregnation method according to the embodiment of the present invention, the resin is discharged from the upper or lower part of the inlets of the passage parts 411 and 421 of the impregnation molds 410 and 420 . The resin discharged in this way is supplied to the passage parts 411 and 421 and may be impregnated with fibers in the passage parts 411 and 421 of the impregnation molds 410 and 420 .

In this case, damage prevention passages 414 and 424 may be further provided at positions corresponding to the inlet section through which the resin is discharged into the flow passages 411 and 412, that is, the resin discharge section.

The damage preventing passages 414 and 424 prevent frictional damage to the fiber due to the discharge pressure of the resin at the inlet side of the flow passage portions 411 and 421 through which the resin is discharged and supplied. In other words, the damage prevention passages 414 and 424 serve to eliminate the contact section between the fibers and the inner walls of the inlet side of the flow passages 411 and 421 by the discharge pressure of the resin.

The impregnation device according to an embodiment of the present invention includes an extruder 500 supplying resin to the impregnating molds 410 and 420 receiving fibers and resin and impregnating the resin into the fibers, and the impregnating molds 410 and 420. do.

The extruder 500 may be configured to discharge resin from an upper part or a lower part of the inlets of the channel parts 411 and 421 of the impregnation molds 410 and 420 .

The damage preventing passages 414 and 424 have fine protrusions 416 and 426 (see FIGS. 4 to 9) protruding in a round shape from a wall surface close to the direction in which the resin is discharged (ie, an inner wall surface of the damage preventing passage). can

For example, a plurality of fine protrusions 416 and 426 (see FIGS. 4 to 9) may be provided, and the plurality of fine protrusions 416 and 426 (see FIGS. 4 to 9) are spaced apart from each other It may have a protruding arrangement structure.

In addition to this, in the damage prevention passages 414 and 424, the opposite wall surface facing the wall surface provided with the fine protrusions 416 and 426 (see FIGS. 4 to 6) (that is, the wall surface located far from the resin discharge position) It may have a flat surface (see FIGS. 4-6).

Alternatively, in the damage prevention passages 414 and 424, the wall surface opposite to the wall surface provided with the fine protrusions 416 and 426 (see FIGS. 7 to 9) (ie, the wall surface located far from the resin discharge position) has a wave. Protrusions 418 and 428 (see FIGS. 7-9) may be provided.

The wave protrusions 418 and 428 (see FIGS. 7 to 9) include a plurality of fine protrusions between the plurality of fine protrusions 416 and 426 (see FIGS. 7 to 9) (see FIGS. 7 to 9). reference) and may protrude in the opposite direction.

During high-speed impregnation, the other side of the fiber whose both ends are contacted and supported by a plurality of fine protrusions 416 and 426 (see FIGS. 7 to 9) is connected to the tip of the protruding portion of the wave protrusions 418 and 428 (see FIGS. 7 to 9). This contact can be supported.

In this way, the fiber can move while having a minimum contact area between the plurality of fine protrusions 416 and 426 (see FIGS. 7 to 9) and the wave protrusions 418 and 428 (see FIGS. 7 to 9). It can prevent damage due to friction of fibers.

In particular, during high-speed impregnation, up-and-down flow of fibers may occur while passing through a narrow channel portion. In this case, rather than forming a flat surface on the opposite side of the plurality of microprotrusions 416 and 426 (see FIGS. 7 to 9), the plurality of microprotrusions 416 and 426 (see FIGS. 7 to 9) protrude upward. Having the wave protrusions 418 and 428 (see FIGS. 7 to 9) may be effective in reducing the surface contact or frictional area of the fiber.

The wave protrusions 418 and 428 (see FIGS. 7 to 9 ) protrude upward between the plurality of fine protrusions 416 and 426 and may have a radius of curvature greater than that of each of the plurality of fine protrusions 416 and 426 .

For example, the radius of curvature of the fine protrusions 416 and 426 may be determined within a range of 1 to 10 mm. Preferably, the radius of curvature of the fine protrusions 416 and 426 may be determined within a range of 2 to 8 mm.

In addition, the length (L1) of the damage prevention passages (414, 424) is the length (L2) of the wave-type main passages (412, 422) located at the rear end inside the passage parts (411, 421) of the impregnation molds (410, 420). It has a length of 10 to 40% compared to ) and may be located at the front end of the wave-type main flow passages 412 and 422.

Meanwhile, in the impregnation device according to an embodiment of the present invention, the impregnation molds 410 and 420 may be formed in the form of a coat-hanger type die (see FIG. 8).

[Impregnation device including a double impregnation mold and a shared extruder]

1 is a conceptual diagram of an impregnation apparatus including a double impregnation mold and a shared extruder according to an embodiment of the present invention.

The impregnation device including a double impregnation mold and a shared extruder according to an embodiment of the present invention,

It includes a double impregnation mold unit 400 including a first impregnation mold 410 and a second impregnation mold 420 and a single shared extruder (hereinafter referred to as an extruder) 500.

The first impregnation mold 410 refers to a mold, that is, a die for impregnating a first fiber with a resin.

The second impregnation mold 420 refers to a mold, that is, a die for impregnating the second fiber with a resin.

The extruder 500 supplies the resin to the first and second impregnation molds 410 and 420 in which the first and second fibers are impregnated with the resin.

That is, the extruder 500 may simultaneously (or separately) supply the resin to the first and second flow passages 411 and 421 provided inside the first and second impregnation molds 410 and 420, respectively, in a shared manner.

To this end, the extruder 500 includes resin supply lines 510 and 520 that are individually connected to the first and second impregnation molds 410 and 420, respectively.

For example, the extruder 500 includes a first resin supply line 510 and a second resin supply line 520 .

The first resin supply line 510 is formed to supply the resin supplied from the extruder 500 to the first impregnation mold 410 .

The second resin supply line 520 is formed to supply the resin supplied from the extruder 500 to the second impregnation mold 420 .

For example, the first and second resin supply lines 510 and 520 may use a flexible tube having an internal passage capable of smoothly transferring and supplying the resin.

Each of the first and second resin supply lines 510 and 520 may have independent resin supply paths to supply resin to the first and second impregnation molds 410 and 420 , respectively.

Meanwhile, the extruder 500 includes a first resin supply nozzle 511 and a second resin supply nozzle 521 .

The first resin supply nozzle 511 is connected to the end of the first resin supply line 510 . The first resin supply nozzle 511 may inject resin into the first channel portion 411 of the first impregnation mold 410 . Also, a first resin discharge unit 512 for discharging resin into the first flow path unit 411 may be provided at a front end of the first resin supply nozzle 511 .

The second resin supply nozzle 521 is connected to the end of the second resin supply line 520 . The second resin supply nozzle 521 may inject resin into the second passage part 421 of the second impregnation mold 420 . In addition, a second resin discharge unit 522 for discharging resin into the second flow path unit 421 may be provided at the front end of the second resin supply nozzle 521 .

For example, the first resin discharge unit 512 may be formed to discharge resin from the inlet side of the first flow path unit 411 toward the inside of the first flow path unit 411 from top to bottom. This is referred to as an upper discharge method.

In addition, the second resin discharge unit 522 may be formed to discharge resin from the inlet side of the second flow path unit 421 toward the inside of the second flow path unit 421 from bottom to top. This is referred to as a bottom discharge method.

As a specific example, the first resin discharge unit 512 discharges the resin in a direction crossing the longitudinal direction of the first flow path unit 411, vertically from top to bottom toward the inside of the first flow path unit 411. It may be configured to discharge resin.

In addition, the second resin discharge unit 522 discharges the resin in a direction crossing the longitudinal direction of the second flow path portion 421, and discharges the resin vertically from bottom to top toward the inside of the second flow path portion 421. can be configured to

In addition, the first resin ejection part 512 and the second resin ejection part 522 may be formed at the same position facing each other with respect to the double impregnation mold part 400, but the first resin ejection part 512 The directions in which the resin is discharged from the second resin ejection unit 522 may be oppositely symmetrical.

Therefore, as the resin supply system connected from the extruder 500 to the first and second flow passages 411 and 421 has a shape symmetrical to each other, it is possible to control the supply and pressure of the resin with a constant control flow to achieve a shared There is an advantage in that it is easy to control the supply of resin in the form.

2 and 3 are conceptual views showing various embodiments of an impregnation device including a dual impregnation mold unit and a shared extruder according to an embodiment of the present invention. And FIGS. 4 to 6 are views showing a damage prevention passage having a flat surface and a fine protrusion in the impregnation device shown in FIG. 3 . 7 to 9 are views showing a damage prevention passage having fine protrusions and wave protrusions in the impregnation device shown in FIG. 3 .

In the extruder 500, through the first and second resin supply lines 510 and 520 and the first and second resin supply nozzles 511 and 512, and through the first and second resin discharge units 512 and 522, the first and second Resin is supplied to each flow path of the impregnation molds 410 and 420 .

Referring to FIG. 2, both the first flow path portion 411 of the first impregnation mold 410 and the second flow path portion 421 of the second impregnation mold 420 are waves having a set length L. It may have a shaped impregnation section.

The first flow path 411 is supplied with a first fiber from the inlet side and discharged to the outlet side.

At this time, the inside of the first flow path 411 is filled with the resin discharged from the top of the first resin discharge unit 512, and the first fiber is impregnated with the resin.

The second flow path 421 is supplied with a second fiber from the inlet side and discharged to the outlet side.

At this time, the inside of the second flow passage 521 is filled with the resin discharged from the lower portion of the second resin discharge unit 522, and the second fiber is impregnated with the resin.

However, when the entire impregnated section of the first channel portion 411 is formed only in a wave shape (see FIG. 2), when the resin is discharged from the top, the lower part of the first fiber in the initial section of the first channel portion 411 There is a portion that is not impregnated with the resin (ie, a non-impregnated portion).

During high-speed impregnation, the non-impregnated portion of the first fiber may severely contact the wave shape of the first flow path portion 411 to cause damage to the first fiber. In particular, as the linear speed of the first fiber increases, the amount of damage may increase.

In addition, when the entire impregnation section of the second passage portion 421 is formed only in a wave shape (see FIG. 2), when the resin is discharged from the bottom, the upper part of the second fiber in the initial section of the second passage portion 421 A non-impregnated portion will exist.

During high-speed impregnation, the non-impregnated portion of the second fiber may severely contact the wave shape of the second passage portion 421 to cause damage to the second fiber. In particular, as the linear speed of the second fiber increases, the amount of damage may increase.

[First passage part]

Referring to FIG. 3 , a first damage prevention passage 414 having a predetermined length L1 and capable of preventing damage to the first fiber may be further provided in the initial section of the first passage part 411 .

The length L1 of the first damage prevention passage 414 is the entire passage of the first impregnation mold 410, that is, the length L2 of the first wave-shaped main passage 412 within the first passage portion 414. It can have a length of 10 to 40% compared to

For example, the first passage part 411 includes a first wave-shaped main passage 412 and a first damage prevention passage 414 .

The first wave-shaped main passage 412 refers to a main passage of the first impregnation mold 410 for impregnating the first fiber with a resin. The first wave-shaped main flow path 412 may have the same (or similar) shape as the wave shape of the first flow path portion 411 of FIG. 2 .

The first damage prevention passage 414 may be located in front of the first wave-shaped main passage 412 .

In other words, the first damage prevention passage 414 is located at the beginning of the first flow passage 411, and is not impregnated by the resin discharged from the top when the first fiber is introduced, that is, the first fiber is not impregnated. Part damage can be prevented.

When the resin is discharged from the top, the non-impregnated portion of the first fiber appears in the lower portion of the first fiber, and it is important to prevent damage due to contact friction of the lower portion of the first fiber, that is, the non-impregnated portion.

Referring to FIGS. 4 and 7 , an enlarged cross-sectional structure of the first damage prevention passage 414 is shown.

When the first fiber 101 is introduced into the inlet side of the first damage prevention passage 414 and the resin is discharged from the upper part by the first resin ejection unit 512, the non-impregnated portion at the lower part of the first fiber 101 this may occur.

If there is no first damage prevention passage 414 and there is an overall wave-shaped main passage, the lower part of the first fiber 101, that is, the non-impregnated portion, is severely contacted and rubbed against the wave shape during high-speed impregnation, and the first fiber 101 (101) damage.

Therefore, as shown in FIGS. 4 and 7, the first damage prevention passage 414 is disposed ahead of the first wave-shaped main passage 412, and is not impregnated when the first fiber 101 is initially introduced. Part damage can be prevented.

Referring to FIG. 4 , a plurality of first fine protrusions 416 may be provided on an upper end (ie, an upper wall surface close to the resin discharge direction) 415 of the first damage prevention passage according to an embodiment of the present invention. there is.

Also, a flat surface may be formed on a lower end (ie, a lower wall surface located far from the resin ejection position) 417 of the first micro-protrusion 416 .

Referring to FIG. 7 , a plurality of first fine protrusions 416 may be provided at an upper end of the first damage-preventing passage (ie, an upper wall surface close to the discharge direction of the resin) 415 according to another embodiment of the present invention. there is.

However, according to the embodiment shown in FIG. 7, unlike the embodiment shown in FIG. 4, the lower end of the first micro-protrusion 416 (ie, the lower wall surface located far from the resin ejection position) 417 has no A one-wave protrusion 418 may be further provided.

Referring to FIG. 7 , the first wave protrusion 418 protrudes upward between the plurality of first micro protrusions 416 and may have a radius of curvature greater than that of each of the plurality of first micro protrusions 416. .

For example, the radius of curvature of the first microprotrusion 416 may be 1 to 10 mm.

Also, the first wave protrusions 418 may have a radius of curvature greater than that of the first fine protrusions 416 .

The plurality of first fine protrusions 416 are formed on the upper end 415 of the passage space 4141 in which the first fibers 101 flow, and specifically protrude downward toward the top of the first fibers 101. have a shape In this way, the plurality of first micro-protrusions 416 may protrude downward at a set distance from each other and contact the upper portion of the first fiber 101 with a minimum area.

The first wave protrusion 418 is formed at the lower end 417 of the first damage prevention passage, and specifically, may have a shape protruding upward toward the lower portion of the first fiber 101 .

If the plurality of first microprotrusions 416 have a semicircular cross section with a small radius of curvature, the first wave protrusions 418 may have a shape having a radius of curvature greater than the radius of curvature of the first microprotrusions 416. . The first wave protrusion 418 may have a wave-shaped cross section as a whole.

The first wave protrusion 418 protrudes upward between the plurality of first micro protrusions 416 and contacts the lower center of the first fiber 101 supported at both ends by the plurality of first micro protrusions 416 at one point. can support

As described above, the first damage prevention passage 414 may have a plurality of first fine protrusions 416 provided on a wall surface through which resin is discharged, that is, at an upper end of the first damage prevention passage 414 .

Alternatively, a flat surface may be formed at the lower end of the first damage-prevention passage 414 opposite to the wall surface provided with the plurality of first micro-protrusions 416, or a radius of curvature greater than that of the first micro-protrusions 416. A large first wave protrusion 418 may be provided.

According to this structure, it is possible to prevent damage to the first fiber 101, which is a disadvantage of the top discharge method of resin during high-speed impregnation. Furthermore, when the target flux of the first fiber 101 increases as needed, damage to the first fiber may be prevented by appropriately changing the number and shape of the first fine protrusions 416 .

[Second flow path section]

Referring to FIG. 3 , a second damage prevention passage 424 having a predetermined length L1 and capable of preventing damage to the second fiber may be further provided in the initial section of the second passage part 421 .

The length (L1) of the second damage prevention passage 424 is the entire passage of the second impregnation mold 420, that is, the length (L2) of the second wave-shaped main passage 422 within the second passage portion 424. It can have a length of 10 to 40% compared to

For example, the second passage part 421 includes a second wave-shaped main passage 422 and a second damage prevention passage 424 .

The second wave-shaped main passage 422 refers to a main passage of the second impregnation mold 420 for impregnating the second fiber with a resin. The second wave-type main passage 422 may have the same shape as the first wave-type main passage 422 described above.

The second damage prevention passage 424 may be located in front of the second wave-shaped main passage 422 .

In other words, the second damage prevention passage 424 is located at the beginning of the second flow passage 421, and is not impregnated by the resin discharged from the lower part when the second fiber is introduced, that is, the second fiber is not impregnated. Part damage can be prevented.

When the resin is discharged from the bottom, the non-impregnated portion of the second fiber appears at the top of the second fiber, and it is important to prevent damage due to contact friction of the upper portion of the second fiber, that is, the non-impregnated portion.

Referring to FIGS. 5 and 8 , an enlarged cross-sectional structure of the second damage prevention passage 424 is shown.

The second fiber 102 is injected into the inlet side of the second damage prevention passage 424, and the second resin discharge unit 522 discharges the resin from the bottom.

If there is only a wave-shaped main channel as a whole without the second damage prevention channel 424, the upper part of the second fiber 102, that is, the non-impregnated portion is in contact with the wave shape of the main channel in a large area during high-speed impregnation. It can cause serious damage due to friction.

Therefore, as shown in FIGS. 5 and 8, the second damage prevention passage 424 is disposed ahead of the second wave-shaped main passage 422, and the non-impregnated portion of the second fiber 102 is initially introduced. damage can be prevented.

Referring to FIG. 5 , a plurality of second fine protrusions 426 may be provided at the lower end (ie, the lower wall surface close to the discharge direction of the resin) 425 of the second damage prevention passage according to an embodiment of the present invention. there is.

A flat surface may be formed on an upper end of the second damage prevention passage (ie, a lower wall surface located far from the resin discharge position) 427 .

Referring to FIG. 8 , a plurality of second fine protrusions 426 may be provided at the lower end (ie, the lower wall surface close to the discharge direction of the resin) 425 of the second damage prevention passage according to another embodiment of the present invention. there is.

However, according to the embodiment shown in FIG. 8, unlike the embodiment shown in FIG. 5, the upper end of the first microprotrusion 426 (ie, the upper wall surface located far from the resin ejection position) 427 has no 2 wave protrusions 428 may be further provided.

Referring to FIG. 8 , the second wave protrusion 428 protrudes upward between the plurality of second fine protrusions 426 and may have a larger radius of curvature than each of the plurality of second fine protrusions 426. .

For example, the radius of curvature of the second fine protrusion 426 may be 1 to 10 mm.

Also, the second wave protrusions 428 may have a radius of curvature greater than the radius of curvature of the second fine protrusions 426 .

The plurality of second fine protrusions 426 are formed at the lower end 425 of the passage space 4241 in which the second fibers 102 flow, specifically, in a shape protruding upward toward the lower portion of the second fibers 102. have For example, the plurality of second fine protrusions 426 may protrude upward at a set distance from each other and contact the lower portion of the second fiber 102 with a minimum area (eg, point contact).

The second wave protrusion 428 is formed on the upper end 427 of the second damage prevention passage, and specifically, may have a shape protruding downward toward the top of the second fiber 102 .

If the plurality of second fine protrusions 426 have a semicircular cross section with a small radius of curvature, the second wave protrusions 428 may have a shape having a larger radius of curvature than the radius of curvature of the second fine protrusions 426. . The second wave protrusion 418 may have a wave-shaped cross section as a whole.

The second wave protrusion 428 protrudes downward between the plurality of second fine protrusions 426 and contacts the central upper portion of the second fiber 102 supported at both ends by the plurality of second fine protrusions 426 at one point. can support

As described above, the second damage prevention passage 424 may have a plurality of second fine protrusions 426 on a wall surface through which resin is discharged, that is, at a lower end of the second damage prevention passage 424 .

Alternatively, a flat surface may be formed at the upper end of the second damage-preventing passage 424 opposite the wall surface provided with the plurality of second micro-protrusions 426, or a radius of curvature smaller than that of the second micro-protrusions 426. A large second wave protrusion 428 may be provided.

According to this structure, it is possible to prevent damage to the second fiber 102, which is a disadvantage of the lower discharge method of resin during high-speed impregnation. Furthermore, when the target flux of the second fibers 102 increases as needed, damage to the second fibers may be prevented by appropriately changing the number and shape of the second fine protrusions 426 .

Referring to FIGS. 6 and 9 , cross-sectional structures of first and second damage prevention passages 414 and 424 having symmetrical shapes applied to an impregnation device according to an embodiment of the present invention are shown.

In the case of the first impregnation mold 410 , the resin discharged from the first resin discharge unit 512 in the upper discharge method is supplied to the first flow path unit 411 .

In the case of the second impregnation mold 420 , the resin discharged from the second resin discharge unit 522 in the bottom discharge method is supplied to the second flow path unit 421 .

In addition, although a single extruder 500 is used, since the upper and lower discharge methods opposite to each other are applied to the first and second molds 410 and 420, the first and second fibers 101 and 102 are prevented from being damaged at the beginning. To this end, the first and second damage prevention passages 414 and 424 may have symmetrical shapes.

Meanwhile, FIGS. 10A, 10B, and 10C are diagrams schematically illustrating comparative examples in which an upper discharge method, a lower discharge method, and an upper and lower discharge method are applied to an impregnation mold.

Referring to FIG. 10A , the channel 41 of the impregnation mold 40 according to Comparative Example 1 is formed entirely in a wave shape, and the resin discharge unit 51 has an upper discharge method.

In the case of Comparative Example 1, since one impregnation mold 40 is used, there is a disadvantage in that the production speed is about 1/2 slower than that of the embodiment of the present invention. In addition, since the resin is discharged from the upper part, an unimpregnated portion is generated at the lower part of the fiber in the first part. During high-speed impregnation, damage may be caused to the lower part of the fiber by contacting the lower protruding part of the wave-shaped passage 41 .

Referring to FIG. 10B , the channel 41 of the impregnation mold 40 according to Comparative Example 2 is formed entirely in a wave shape, and the resin discharge unit 52 is applied with a bottom discharge method.

In the case of Comparative Example 2, similar to the impregnation mold 40 of Comparative Example 1 shown in FIG. In addition, since the resin is discharged from the lower part, a non-impregnated portion is generated on the upper part of the fiber in the first part. During high-speed impregnation, damage may be induced in the upper part of the fiber by contacting the protruding part of the upper end of the wave-shaped passage 41 .

Referring to FIG. 10C, the passage 41 of the impregnation mold 40 according to Comparative Example 3 is entirely formed in a wave shape, and is provided with a plurality of resin ejection parts 51 and 52 of upper and lower ejection methods. has been

In the case of Comparative Example 3, compared to Comparative Example 1 of FIG. 10A and Comparative Example 2 of FIG. 10B, the effect of suppressing damage to the unimpregnated portion of the fiber to some extent can be expected, but Compared to the embodiment of the present invention in which the double impregnation part 400 including the impregnation molds 410 and 420 is applied, there is a disadvantage in that the production speed and production volume are reduced by about 1/2.

In other words, Comparative Example 3 shown in FIG. 10C applies an upper and lower discharge method to a single impregnation passage, and has a disadvantage in that productivity is lower than that of the embodiment of the present invention having a plurality of impregnation passages.

11 is a conceptual diagram briefly illustrating a coat hanger die method.

As shown, the first impregnation mold 410 is applied with the first resin ejection part 512 of the upper discharge method, and the second impregnation mold 420 has the second resin ejection part 522 of the lower discharge method. It is applied. In addition, the first and second impregnation molds 410 and 420 may be provided in the form of a coat-hanger type die.

In this way, as the first and second impregnation molds 410 and 420 are formed in the form of a coat hanger die, the resins R1 and R2 can be uniformly applied to the first and second fibers spread in the width direction and introduced. there is

[Continuous Fiber Reinforced Thermoplastic Composite Manufacturing Equipment]

12 is an overall configuration diagram of a continuous fiber-reinforced thermoplastic composite manufacturing apparatus using an impregnation apparatus according to an embodiment of the present invention.

Continuous fiber-reinforced thermoplastic composite manufacturing apparatus 1000 according to an embodiment of the present invention includes a fiber supply unit 100, a fiber transfer unit 200, a spreading unit 300, a double impregnation mold unit 400, an extruder 500, A cooling roll unit 600 and a winding roll unit 700 are included.

The fiber supply unit 100 supplies a plurality of fibers, for example, a first fiber 101 and a second fiber 102. Here, the first fiber 101 and the second fiber 102 may be the same type of fiber or may be different types of fibers.

If the first fiber 101 and the second fiber 102 are the same type of fiber, the productivity of the UD sheet can be increased by about twice.

If the first fiber 101 and the second fiber 102 are different types of fibers, a UD sheet made of two types of fibers may be manufactured using a single production line.

As a specific example, the fiber supply unit 100 includes a first bobbin 110 and a second bobbin 120. The first bobbin 110 winds and stores the first fiber 101 so as to supply the first fiber 101 . The second bobbin 120 winds and stores the second fiber 101 so as to supply the second fiber 102 . At this time, although not shown separately, each of the first and second bobbins 110 may be provided with a creel device for controlling the tension of the first and second fibers 101 and 102, and various creel devices obvious to those skilled in the art. Can be used without restrictions.

The fiber transfer unit 200 guides the plurality of fibers supplied from the fiber supply unit 100, that is, the first and second fibers 101 and 102 through different paths and transfers them to the inlet of the spreading unit 300.

As a specific example, the fiber transfer unit 200 includes a first guide bar 210 and a second guide bar 220 .

The first guide bar 210 is a guide bar for guiding the first fiber 101 to supply the first fiber 101 supplied from the first bobbin 110 to the inlet side of the first spreader 310 can be made into a shape.

The second guide bar 220 is a guide bar for guiding the second fiber 102 to supply the second fiber 102 supplied from the second bobbin 120 to the inlet side of the second spreader 320 can be made into a shape.

Meanwhile, the fiber supply unit 100 may further include a first guide roll 130 guiding the first fiber 101 supplied from the first bobbin 110 toward the first guide bar 210 .

In addition, the fiber supply unit 100 may further include a first guide roll 140 guiding the second fiber 102 supplied from the second bobbin 120 toward the second guide bar 220 .

The spreading unit 300 includes a first spreader 310 and a second spreader 320 .

The first spreader 310 is a device that spreads the first fiber 101, which is one of a plurality of fibers, in the width direction. Similarly, the second spreader 320 is a device that spreads the second fiber 102, which is another one of the plurality of fibers, in the width direction.

For example, the second spreader 320 may be formed at a different location from the first spreader 310 . The second spreader 320 may be disposed parallel to the first spreader 320 at a predetermined height interval below the first spreader 310 .

In other words, the first and second spreaders 310 and 320 may be arranged side by side on the upper and lower sides with a predetermined height gap from each other, and the outlet side of each is the inlet side of the first and second impregnation molds 410 and 420. and can be placed horizontally.

As a specific example, the first spreader 310 is preferably located on the same height as the first impregnation mold 410 . Also, the second spreader 320 may be vertically parallel to the first spreader 310 and positioned on the same height as the second impregnation mold 420 .

In addition, the outlet side of the first spreader 310 may be formed facing the inlet side of the first impregnation mold 410 at a front-to-rear interval. Similarly, the outlet side of the second spreader 410 may be formed to face the inlet side of the second impregnation mold 420 at a front-to-rear interval. As a result, the first and second fibers 101 and 102 discharged from the first and second spreaders 310 and 320 are parallel to the inlets of the first and second impregnation molds 410 and 420 with a set height difference. can be put in As a result, the continuity of the spreading process and the impregnation process can be improved, and the quality of the impregnation process can be improved.

The double impregnation mold unit 400 includes a first impregnation mold 410 and a second impregnation mold 420 . The first impregnation mold 410 is a device that impregnates the resin into the first fiber 101 spread to a set width after passing through the first spreader 310 . The second impregnation mold 420 is a device that impregnates the resin into the second fibers 102 spread to a set width after passing through the second spreader 320 .

The second impregnation mold 420 is vertically separated from the first impregnation mold 410 and may have individual flow path portions (hereinafter referred to as the first flow path portion 411 and the second flow path portion 421). .

The first impregnation mold 410 and the second impregnation mold 420 have a double impregnation mold structure separated into upper and lower parts. For this reason, the double impregnation mold unit 400 can simultaneously impregnate the first and second fibers 101 and 102 with resin using the first and second flow passages 411 and 421 . Thus, in the case of fibers of the same type, the productivity of the UD sheet can be increased by approximately two times, and in the case of fibers of different types, UD sheets made of different types of fibers can be manufactured.

The extruder 500 refers to a single extruder that supplies resin to the first and second impregnation molds 410 and 420, respectively. In other words, in the conventional case, at least one extruder was used for the impregnation mold, and the extruder corresponds to a device having a large size among the entire manufacturing devices. Therefore, when the number of impregnation molds is increased to two, two extruders had to be used, so there was a problem in that the space of the manufacturing line was limited. For this reason, there was a problem in that a larger space was required in order to increase the productivity of the UD sheet and pursue a high-speed design.

In the present invention, a single extruder 500 may be used by sharing the first and second impregnation molds 410 and 420. Accordingly, it is possible to produce approximately twice as many UD sheets while reducing spatial restrictions due to the installation of the extruder 500, thereby lowering manufacturing costs and improving productivity.

The cooling roll unit 600 refers to a roll device that receives a material in which the first and second fibers are impregnated with a resin through the double impregnation mold unit 400 and cools the material.

For example, the cooling roll unit 600 includes a first cooling roll 610 and a second cooling roll 620 . The first cooling roll 610 receives the material transferred through the first impregnation mold 410 (ie, the material in which the first fiber is impregnated with a resin) and cools it to a predetermined temperature. The second cooling roll 620 receives the material transferred through the second impregnation mold 620 (ie, the material in which the second fiber is impregnated with resin) and cools it to a predetermined temperature.

As a specific example, the first and second cooling rolls 610 and 620 may be arranged at regular height intervals corresponding to the height difference between the first and second impregnation molds 410 and 420 .

The winding roll unit 700 refers to a roll device that winds and stores the material transferred through the cooling roll unit 600, that is, the continuous fiber-reinforced thermoplastic composite material (or UD sheet).

For example, the winding roll unit 700 includes a first winding roll 710 and a second winding roll 720 .

The first winding roll 710 may wind the material passing through the first cooling roll 610 , and the second winding roll 720 may wind the material passing through the second cooling roll 620 .

As described above, the present invention has been described with reference to the drawings illustrated, but the present invention is not limited by the embodiments and drawings disclosed herein, and various modifications are made by those skilled in the art within the scope of the technical idea of the present invention. It is obvious that variations can be made.

100: fiber supply unit
101: fiber
110: first bobbin
120: second bobbin
130: first guide roll
140: second guide roll
200: fiber transfer unit
210: first guide bar
220: second guide bar
300: spreading unit
310: first spreader
320: second spreader
400: double impregnation mold part
410: first impregnation mold
411: first flow path part
412: first wave-type main flow
414: first damage prevention passage
4141: Eurospace
415: top of the first damage prevention passage
416: first fine protrusion
417: lower end of the first damage prevention passage
418: first wave protrusion
420: second impregnation mold
421: second flow path part
422: second wave type main flow
424: second damage prevention passage
4241: Eurospace
425: lower end of the second damage prevention passage
426: second fine protrusion
427: top of the second damage prevention passage
428: second wave protrusion
500: extruder
510: first resin supply line
511: first resin supply nozzle
512: first resin discharge unit
520: second resin supply line
521: second resin supply nozzle
522: second resin discharge unit
600: cooling roll unit
610: first cooling roll
620: second cooling roll
700: winding roll part
710: first winding roll
720: second winding roll
1000: Continuous fiber reinforced thermoplastic composite manufacturing apparatus using double impregnation mold

Claims (24)

As an impregnation method for impregnating by supplying fibers and resins into the impregnation mold,
Discharging the resin from the top or bottom of the inlet of the flow path of the impregnation mold,
Provided with a damage prevention passage in the discharge section of the resin, to prevent contact between the fiber and the inner wall of the flow passage due to the discharge pressure of the resin
impregnation method.
According to claim 1,
As the damage prevention oil,
Having a fine protrusion protruding from the wall surface close to the discharge direction of the resin
impregnation method.
According to claim 2,
The fine protrusions are provided with a plurality,
The plurality of fine protrusions protrude from each other at set intervals
impregnation method.
According to claim 3,
On the wall opposite to the wall on which the fine protrusions are provided,
forming a flat surface
impregnation method.
According to claim 3,
On the wall opposite to the wall on which the fine protrusions are provided,
A wave protrusion protruding upward between the plurality of fine protrusions and having a radius of curvature greater than the radius of curvature of each of the plurality of fine protrusions
impregnation method.
According to claim 1,
The impregnation mold,
Coat-Hanger Type die
impregnation method.
An impregnation mold for receiving fiber and resin and impregnating the fiber with the resin; and
Including; extruder for supplying the resin to the impregnation mold,
The extruder includes a resin discharge unit for discharging resin from the upper or lower portion of the inlet of the flow path of the impregnation mold,
Among the passage parts of the impregnation mold, at a position corresponding to the resin discharge part,
A damage prevention passage is provided to prevent contact between the fiber and the inner wall of the passage by the discharge pressure of the resin.
impregnation device.
According to claim 7,
As the damage prevention oil,
Having a fine protrusion protruding from the wall surface close to the discharge direction of the resin
impregnation device.
According to claim 8,
The fine protrusions are provided with a plurality,
The plurality of fine protrusions protrude at intervals from each other
impregnation device.
According to claim 9,
On the wall opposite to the wall on which the fine protrusions are provided,
forming a flat surface
impregnation device.
According to claim 9,
On the wall opposite to the wall on which the fine protrusions are provided,
A wave protrusion protruding upward between the plurality of fine protrusions and having a radius of curvature greater than the radius of curvature of each of the plurality of fine protrusions
impregnation device.
According to claim 7,
The impregnation mold,
Coat-Hanger Type die
impregnation device.
A first impregnation mold for impregnating a first fiber with a resin;
A double impregnation mold unit including a second impregnation mold for impregnating a second fiber with a resin; and
a single extruder having resin supply lines individually connected to the first and second impregnation molds and supplying resin to the first and second impregnation molds;
Impregnation device comprising a.
According to claim 13,
The first impregnation mold and the second impregnation mold are stacked vertically,
The first impregnation mold and the second impregnation mold are parallel to each other to receive resin from the extruder.
impregnation device.
According to claim 13,
The first fiber and the second fiber,
fibers of the same or different types
impregnation device.
According to claim 13,
The extruder,
a first resin supply line supplying resin to the first impregnation mold;
a second resin supply line supplying resin to the second impregnation mold;
a first resin supply nozzle connected to an end of the first resin supply line and having a first resin discharge part to inject resin into the first passage part of the first impregnation mold; and
a second resin supply nozzle connected to an end of the second resin supply line and having a second resin discharge part to inject resin into the second flow path of the second impregnation mold;
Impregnation device comprising a.
According to claim 16,
The first resin discharge unit,
discharging resin from top to bottom toward the inlet of the first flow path;
The second resin discharge unit,
Discharging resin from bottom to top toward the inlet of the second flow path
impregnation device.
According to claim 17,
The first flow path part,
a first wave-type main passage for impregnating the first fiber with a resin; and
A first damage prevention passage located in front of the first wave-shaped main passage and preventing damage to the non-impregnated portion of the first fiber when the first fiber is initially introduced,
A plurality of first fine protrusions protruding downward at an interval from each other at an upper end of the first damage prevention passage and contacting the upper portion of the first fiber are provided
impregnation device.
According to claim 18,
At the bottom of the first damage prevention passage,
forming a flat surface
impregnation device.
According to claim 18,
At the bottom of the first damage prevention passage,
A first wave protrusion protruding upward between the plurality of first micro-protrusions and having a radius of curvature greater than the radius of curvature of each of the plurality of first micro-protrusions.
impregnation device.
According to claim 17,
The second flow path part,
a second wave-type main passage for impregnating the second fiber with a resin; and
A second damage prevention passage located in front of the second wave-shaped main passage and preventing damage to the non-impregnated portion of the second fiber when the second fiber is initially introduced,
A plurality of second fine protrusions protruding upward at a distance from each other at the lower end of the second damage prevention passage and contacting the lower portion of the second fiber are provided
impregnation device.
According to claim 21,
At the top of the second damage prevention passage,
forming a flat surface
impregnation device.
According to claim 21,
At the top of the second damage prevention passage,
A second wave protrusion protruding downward between the plurality of second fine protrusions and having a radius of curvature greater than the radius of curvature of each of the plurality of second fine protrusions.
impregnation device.
According to claim 13,
Each of the first impregnation mold and the second impregnation mold,
Characterized in that the coat hanger die (Coat-Hanger Type die)
impregnation device.

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