KR101851531B1

KR101851531B1 - Fiber contact and Non-contact, free or driven roll applied fiber spreader

Info

Publication number: KR101851531B1
Application number: KR1020160002696A
Authority: KR
Inventors: 변의현; 김혜영
Original assignee: 한화첨단소재 주식회사
Priority date: 2016-01-08
Filing date: 2016-01-08
Publication date: 2018-04-24
Also published as: KR20170083350A

Abstract

The present invention relates to a fiber expander, which utilizes a method of physically expanding a fiber using a plurality of rolls, but significantly reduces the price compared to a conventional fiber unfolding facility by implementing contact, noncontact, , A fiber expander with fiber-contact-noncontact, fixed or rotating rolls that enables high-speed continuous production of high quality CFRTPC by increasing the spreading efficiency up to 300% by maximizing the fiber unwinding effect.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a fiber contact and a contactless, non-contact,

The present invention relates to a fiber expander, and more particularly, to a fiber expander in which a fiber contact-noncontact, fixed or rotating roll is applied, which simplifies the fiber unfolding process and improves the resin impregnability and the quality of the prepreg.

Continuous Fiber Resin Plastic (CFRP) is a lightweight material that has excellent physical properties (strength, stiffness, etc.) and is being used as a substitute for high strength steel used in various industries such as aviation and automobile.

In order to improve the physical properties of the continuous fiber reinforced composite material, it is important to enhance the impregnation property so that the resin penetrates into the hollow space between the fiber strands well.

In this case, to maximize the resin impregnation, the fiber strands must be well dispersed. For this purpose, a fiber spreader is used.

Generally, a fiber expander is constituted by a contact type fixed roll or a rotating roll and is physically configured to expand the fiber. Such a fiber expander has a fiber spreading width of about 120% to 200% .

In addition, when the fiber is unfolded, excessive tension causes a fiber damage (Fuzz or fracture), thereby deteriorating the physical properties and productivity of the continuous fiber reinforced composite material.

There is a chemical method of lowering the coherent energy between fiber strands by burning a binder in order to improve the fiber spreading property except for the physical fiber unfolding method, but this method has a disadvantage that the fiber damage and the manufacturing facility cost are high .

To summarize, a typical physical fiber spreader used to enhance impregnation between fiber and resin is configured to expand only by the pulling force of the fibers passing between rolls and rolls, so that voids in the continuous fiber reinforced composite material It is difficult to improve physical properties and high-speed production due to generation of voids and fiber breakage due to excessive tension. Further, because of insufficient fiber stretchability, the resin is not impregnated properly, there is a problem.

Another method, the fiber disintegration through chemical treatment / pyrolysis, is not only damaging the fibers but also causing air pollution in the gases generated during combustion.

Korean Patent Publication No. 10-2007-0107035 (November 11, 2007), "Carbonaceous composite material heat spreader and related method" Korean Patent Publication No. 10-2015-0097765 (Aug. 26, 2015), "Vibratory spreader bar for dispersing unidirectional yarns"

Disclosure of Invention Technical Problem [8] The present invention has been made in view of the above-mentioned problems in the prior art, and it is an object of the present invention to provide a method and apparatus for physically stretching fibers using a plurality of rolls, Functional implementation enables the high-speed continuous production of high quality CFRTPC with high physical properties by increasing the efficiency of spreading up to 300% by greatly reducing the price compared to conventional fiber unfolding facilities and maximizing the fiber spreading effect. The main purpose of the present invention is to provide a fiber expander to which a rotating roll is applied.

In order to achieve the above-mentioned object, the present invention provides a first, second, and third spreading roll sets, each of which is rotatably installed at a distance from each other so that fiber strands are arranged side by side. First and second flat rolls, and first, second, and third flat rolls fixed to respective one side surfaces of the first, second, and third spread roll sets so as not to rotate, Contact, non-contact, stationary, or rotating roll, configured to be in contact with and non-contact with the fiber strands when the first, second, and third spread roll sets are rotated, In the fiber expander to which this invention is applied;
Wherein the second set of rolls is offset 20-55 degrees downward relative to the first roll of rolls and the third roll of rolls is offset 20-55 degrees upward relative to the second roll of rolls;
The roll gap of the first, second and third flat rolls is maintained at 40-60 degrees in the circumferential direction with respect to the center of the circle of the first, second and third spread roll sets;
Wherein the first, second, and third spread roll sets are configured to rotate in opposite directions to each other so that the line speed can be increased to 10 m / min or more. Provides a fiber spreader.

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According to the present invention, the following effects can be obtained.

First, the fiber stretchability can be improved to about 250-300% as compared with the conventional fiber width, thereby enhancing the physical properties of the material by increasing the impregnation between the fibers and the resin.

Second, productivity is improved by minimizing fiber fuzz and fracture while repeating contact-noncontacting between fiber and rotary roll.

Third, it is superior in spreadability than conventional physical fiber spreader, has less fiber breakage, and is cheaper than chemical fiber spreader.

Fourth, if the distance between sets is changed, the fiber spreading width can be easily adjusted, so that the fiber spreading width can be freely implemented.

Fifth, in the case of the fiber roll roll, since it can be applied to metal or plastic material, the low friction coefficient and the electric friction are reduced, and the processing efficiency is improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exemplary view showing an operation example of a general physical fiber spreader. FIG.
2 is an exemplary schematic diagram of a physical fiber spreader in accordance with the present invention.
3 is an exemplary partial plan view of an example of operation of a physical fiber expander in accordance with the present invention.
4 is an enlarged view of the main part of Fig.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Before describing the present invention, the following specific structural or functional descriptions are merely illustrative for the purpose of describing an embodiment according to the concept of the present invention, and embodiments according to the concept of the present invention may be embodied in various forms, And should not be construed as limited to the embodiments described herein.

In addition, since the embodiments according to the concept of the present invention can make various changes and have various forms, specific embodiments are illustrated in the drawings and described in detail herein. However, it should be understood that the embodiments according to the concept of the present invention are not intended to limit the present invention to specific modes of operation, but include all modifications, equivalents and alternatives falling within the spirit and scope of the present invention.

As shown in FIG. 1, a general physical fiber expander includes a plurality of rolls, such as first, second, and third rolls R1, R2, and R3 that are stretched while being stretched while passing through the fiber strands F, .

Therefore, the first, second, and third rolls R1, R2, and R3 are fixed, which allows the first and second rolls R1, R2, The stretch ratio is low because the fiber strand F passing through the roll R3 must be stretched while being always moved at a predetermined constant angle.

In addition, since the fiber strand (F) must remain in contact with the first, second, and third rolls (R1, R2, R3) at all times,

Alternatively, the fiber expander having the fiber contact-noncontact, fixed or rotary roll according to the present invention may be configured to vary elongation by changing the angle at which the roll contacted with the fiber is repeatedly contacted and noncontact repeatedly, But also has the feature of improving the fiber spreading ability as well as the increase.

More specifically, as shown in Figs. 2-4, a fiber expander to which a fiber contact-non-contact, stationary or rotating roll is applied comprises at least two sets of spread roll sets.

However, the example shown in FIG. 2 exemplifies three first, second, and third spread roll sets SR1, SR2, and SR3, which are for convenience of description and are not limited to the illustrated numbers.

Three first, second and third flat rolls PR1, PR2 and PR3 are fixed to the first, second and third spread roll sets SR1, SR2 and SR3, respectively. That is, if the first, second and third spread roll sets SR1, SR2 and SR3 are a kind of rotary plate and the first, second and third flat rolls PR1, PR2 and PR3 are fixed on one side of the rotary plate, easy to do. Of course, if both ends of the first, second, and third flat rolls PR1, PR2, and PR3 are fixed to the rotary plates respectively, more stable driving will be possible.

The first, second and third spread roll sets SR1, SR2 and SR3 are rotated, and the first, second and third flat rolls PR1, PR2 and PR3 are fixed, And the first, second and third spread roll sets SR1, SR2 and SR3 rotate together.

In particular, the first, second and third flat rolls PR1, PR2 and PR3 are illustrated as being limited to three, but the present invention is not limited thereto.

This may vary depending on the radius of the first, second, and third spread roll sets SR1, SR2, and SR3, and may be changed according to the fiber unwinding throughput.

However, the spreading function should be treated with high efficiency, and at the same time, the number of the flat rolls should be kept at least three and at most nine in order to prevent fiber breakage during stretching.

The first, second and third spread roll sets SR1, SR2 and SR3 can be uniformly stretched and spreaded by keeping the interval between the rolls PR1, PR2 and PR3 constant. SR3) at a certain angle in the radial direction.

Particularly, as a result of the experiment, the interval between the first, second and third flat rolls PR1, PR2 and PR3 is set to be 40 (radial direction) from the center of the circle of the first, second and third spread roll sets SR1, SR2, -60 °.

Since the angle between the first, second and third spread roll sets SR1, SR2 and SR3 is related to the elongation and spreading of the fiber strand F, it should be maintained at an appropriate angle. It was confirmed to be in an optimal state.

The first, second, and third flat rolls PR1, PR2, and PR3 repeatedly come into contact with and non-contact with the fiber strands F, and therefore have a low friction coefficient that can reduce friction with the fiber strands F. It is preferable that it is formed of a material.

For example, metal or plastic is preferable. For example, it is preferable to use one of steel, Al, Cu, ceramic, acetal, PA, polyethylene terephthalate (PTFE) and polytetrafluoroethylene This electrical friction can be reduced.

As the fibers to which the present invention is applied, glass fibers, carbon fibers, aramid fibers, and relatively flexible fibers such as flax, kenaf, bamboo, and silk are preferred among natural fibers.

The present invention having such a configuration has the following operational relationship.

The unfolded fiber strand F has a first unfolding roll set SR1, a second unfolding roll set SR2 and a third unfolding roll set SR2 having an angle of inclination of 20-55 and staggered with each other between adjacent roll sets, SR3) are vertically staggered, that is, they are arranged in a zigzag fashion up and down.

At this time, the fiber strand F is brought into contact with any one of the first, second and third flat rolls PR1, PR2 and PR3 provided in the first, second and third spread roll sets SR1, SR2 and SR3, .

As shown in FIG. 3, it is natural that the fiber strands F are arranged in a plurality of strands in the longitudinal direction of the first, second and third spread roll sets SR1, SR2 and SR3.

When the first, second, and third spread roll sets SR1, SR2, and SR3 are rotated, the fiber strand F is divided into the first, second, and third flat rolls PR1, PR2, Contact with one of them will be repeated.

This is because the first, second, and third spread roll sets SR1, SR2, and SR3 fixing the first, second, and third flat rolls PR1, PR2, PR3 are spaced apart from each other by a predetermined distance, Because.

Here, the stretching efficiency and the spreading efficiency are high, and the adjacent first, second, and third spreading roll sets SR1, SR2, and SR3 are disposed in the direction in which the fibers advancing or in the opposite direction .

When the first unfolding roll set SR1 rotates in the counterclockwise direction and the second unfolding roll set SR2 rotates in the clockwise direction, One of the first, second and third flat rolls provided on the second spread roll set SR2 is pressed in a direction of pushing up the fiber strand F. On the other hand, One pushes the fiber strand (F) in a downward direction.

However, since the pushing direction is performed while rotating toward the pushing-up direction in the first unwinding roll set SR1, the contact and non-contact are intermittently caused in the state in which the tension is not excessively applied and the pulling effect is interrupted. It is maximized.

That is, in order to maximize the elongation, when the first and second spread roll sets SR1 and SR2 are rotated in the same direction so that the tensile force largely acts, and the first spread roll set SR1 pushes up the fiber strand F, If the unfolded roll set SR2 is pushed down and the fiber strand F is pushed in the direction opposite to the pushed-up direction, an excessive tensile force acts to maximize the tensile efficiency, but in this case, the fiber tends to occur easily.

Therefore, in the present invention, since the first, second, and third flat rolls PR1, PR2, and PR3 are rotated while rotating in the opposite sense of the conventional wisdom, the stretching can be maximized without tension.

Therefore, compared with a general physical fiber spreader, a significantly improved fiber spreading effect and a stretching effect can be obtained.

In particular, when using such a concept, the productivity is low because the line speed can not be maintained at less than 10 m / min in order to prevent breakage of the line speed. However, in the present invention, the line speed can be maintained at 10 m / min or more, .

SR1: First spread roll set SR2: Second spread roll set
SR3: Third spread roll set PR1: First roll
PR2: the second balance PR3: the third balance

Claims

A first, second and a third spread roll set which are installed at intervals so as to allow the fiber strands to run side by side and are rotatable; First and second flat rolls, and first, second, and third flat rolls fixed to respective one side surfaces of the first, second, and third spread roll sets so as not to rotate, Contact, non-contact, stationary, or rotating roll, configured to be in contact with and non-contact with the fiber strands when the first, second, and third spread roll sets are rotated, In the fiber expander to which this invention is applied;
Wherein the second set of rolls is offset 20-55 degrees downward relative to the first roll of rolls and the third roll of rolls is offset 20-55 degrees upward relative to the second roll of rolls;
The roll gap of the first, second and third flat rolls is maintained at 40-60 degrees in the circumferential direction with respect to the center of the circle of the first, second and third spread roll sets;
Wherein the first, second, and third spread roll sets are configured to rotate in opposite directions to each other so that the line speed can be increased to 10 m / min or more. Fiber spreader.

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