KR20190037441A - The Method For Manufacturing A Recycled Fiber Reinforced Plastic Composite From Continuous Fiber Reinforced Composite Waste and Random Sheet Using By This Method - Google Patents

Abstract

The present invention relates to a production method of a recycled composite material sheet using a plastic composite material waste and, more specifically, to a recycled fiber-reinforced plastic sheet in which scraps are crushed in a crusher using scraps and wastes generated in a process for producing a continuous fiber-reinforced plastic composite material and which is produced through melting and press-forming after the crushed scraps are evenly dispersed and to a production method thereof.

Description

TECHNICAL FIELD The present invention relates to a method for producing a recycled fiber-reinforced plastic composite material using continuous fiber-reinforced plastic composite material waste, and a random sheet produced by the method. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recycled fiber- }

The present invention relates to a method for manufacturing a recycled fiber reinforced plastic composite material using continuous fiber reinforced plastic composite material waste and a random sheet produced by the method.

In the production of plastic composite materials and parts manufacturing processes, a large amount of plastic composite scrap is generated in addition to plastic composite materials when the plastic composite material is produced, and waste such as defective products and damaged products are also generated.

There are methods of recycling, incineration and landfilling by the method of disposing of scrap, defective product and waste of plastic composite material. However, the landfilling of plastic composite material not only causes lethal environmental pollution, but also requires many hundreds of years have. Incineration of plastic composite materials may cause environmental pollution such as air pollution and land pollution due to harmful gas generated during incineration, or may cause harmful effects on human body, animals and plants.

Accordingly, techniques for recycling and recycling plastic composite materials instead of incineration and landfilling methods of plastic composite materials have been developed.

In the related art disclosed in the related art related to a method of regenerating a plastic composite material, for example, Korean Patent Laid-Open No. 10-2017-0096287 discloses a bath filled with a heat medium oil, A barrel which has a through hole through which the material can be transferred and which allows the thermal oil to flow in and out, and which directly contacts the thermal oil to dissolve the waste plastic; a supply means for supplying waste plastic to the barrel inlet; And a transfer means for transferring the waste plastic which is not dissolved.

However, in the conventional waste plastic regenerating apparatus, the dispersibility of the waste plastics formed by regenerating from the waste plastic regenerator is deteriorated, so that the problem of lowering of surface fineness such as fiber protrusion and bunching phenomenon may occur, The uniformity of thickness of the product may not be uniform.

In order to solve the above problems, the inventors of the present invention have found that when a random sheet is manufactured by using a continuous fiber-reinforced plastic composite material waste recycled fiber reinforced plastic composite material, degradation of dispersibility and physical properties can be minimized Thereby completing the present invention.

It is an object of the present invention to provide a continuous fiber reinforced plastic composite material waste which has excellent dispersibility and has excellent thickness uniformity of a finished product and which can minimize a variation in physical properties by improving problems of surface quality deterioration such as fiber protrusion and aggregation To provide a method for producing a regenerated fiber-reinforced plastic composite material.

The present invention also provides a random sheet produced by a method for producing a recycled fiber-reinforced plastic composite material using continuous fiber-reinforced plastic composite material waste.

According to a first preferred embodiment of the present invention, there is provided a method for producing a continuous fiber-reinforced plastic composite material, comprising the steps of: pulverizing waste of a continuous fiber-reinforced plastic composite material into a pulverizer and pulverizing the pulverized material to a length of 5 to 20 mm; A first dispersing step in which the waste having been subjected to the pulverizing step is put into a feeder equipped with an impeller and dispersed through rotation of the impeller; A secondary dispersion step of discharging the waste having undergone the primary dispersion step with a vibrator and transporting the vibration; The waste having been subjected to the second dispersion step is transferred to a first conveyor formed in an embossed shape by projecting the projections while rotating a roll brush located at an upper portion spaced apart from the first conveyor by brushing and dispersing, A dispersing step; A melting step of melting the waste through the third dispersion step; A press forming step of press-molding the waste having undergone the melting step by a double belt press; And a winding step of cooling the sheet subjected to the press forming step and winding the sheet on a winder.

In the first dispersion step, a feeder equipped with an impeller is provided with an impeller inside the feeder. The impeller includes a rotation shaft for rotating the guide shaft, a guide rod formed in a direction orthogonal to the rotation axis, and a plurality of guide rods, And a brush formed on one surface of the brush which contacts the inner surface of the brush.

The secondary dispersion step is characterized in that the foreign matter is removed from the wastes subjected to the primary dispersion step of the vibrator alone during the vibration transmission of the vibrator.

The third dispersing step collects wastes separated from the first conveyor among the wastes dispersed by the roll brushes in the left and right spaces of the first conveyor.

The melting step is characterized in that the waste from the third dispersion step is melted by a melting machine including at least one of a convection oven and an IR direct light heater surrounding the path of the conveyor.

The press molding step is characterized in that the waste having undergone the melting step is subjected to press molding using a double belt press.

As a first preferred embodiment according to the present invention, there is provided a reclaimed sheet produced by a process for producing a recycled fiber reinforced plastic composite material using continuous fiber-reinforced plastic composite material waste.

According to the construction as described above, the method of manufacturing the recycled fiber reinforced plastic composite material using the continuous fiber-reinforced plastic composite material waste according to the present invention is cost-competitive because it does not consume the raw material cost except for the process cost, It is possible to provide an excellent appearance quality and thickness uniformity by minimizing variation in physical properties by improving the dispersibility and surface quality degradation problem compared with the regenerated fiber reinforced plastic composite material.

FIG. 1 is a flowchart illustrating a manufacturing process of a recycled fiber reinforced plastic composite material using continuous fiber-reinforced plastic composite material waste according to an embodiment of the present invention.
FIG. 2 is a photograph showing the waste of step S10 by size.
3 is a perspective view showing the feeder of step S20.
4 is a schematic diagram showing step S30.
5 is a plan view showing the vibrator of step S30.
6 is a schematic diagram showing step S40.
7 is a schematic diagram showing step S50.
8 is a schematic view showing the process of steps S60 to S70.
9 is a recycled sheet manufactured in step S70.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. It is to be understood that the following description is illustrative of the present invention, and the technical spirit of the present invention is not limited to the following description. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

In addition, the thicknesses of the lines and the sizes of the constituent elements shown in the drawings may be exaggerated or reduced for clarity of description and convenience, and the terms used herein may be defined by the user in terms of the functions defined in the present invention, , The terms may vary depending on the intentions or practices of the operator. Therefore, the definitions of the terms described in this specification should be interpreted based on the contents throughout this specification.

According to a preferred embodiment of the present invention, the waste of continuous fiber reinforced plastic composite material is pulverized into a pulverizer with a length of 5 to 20 mm, and the pulverized waste is fed into a feeder equipped with an impeller A first dispersion step in which the impeller is dispersed through rotation of the impeller; A secondary dispersion step of discharging the waste having undergone the primary dispersion step with a vibrator and transporting the vibration; The waste having been subjected to the second dispersion step is transferred to a first conveyor formed in an embossed shape by projecting the projections while rotating a roll brush located at an upper portion spaced apart from the first conveyor by brushing and dispersing, A dispersing step; A melting step of melting the waste through the third dispersion step; A press forming step of press-molding the waste having undergone the melting step by a double belt press; And a winding step of cooling the sheet subjected to the press forming step and winding it on a winder.

The manufacturing process of the recycled fiber reinforced plastic composite material using the continuous fiber-reinforced plastic composite material waste according to the preferred embodiment of the present invention is suitable for manufacturing the recycled fiber reinforced plastic composite material.

FIG. 1 is a flowchart illustrating a manufacturing process of a recycled fiber reinforced plastic composite material using continuous fiber-reinforced plastic composite material waste according to an embodiment of the present invention.

A method for manufacturing a recycled fiber reinforced plastic composite material using the continuous fiber-reinforced plastic composite material waste according to the present invention will be described with reference to FIG.

Step S10 includes a pulverizing step in which the waste of continuous fiber-reinforced plastic composite material is put into a pulverizer and pulverized to a length of 5 to 20 mm;

Step S20, and a primary dispersion step in which the wastes having undergone the pulverization step are charged into a feeder equipped with an impeller and dispersed through rotation of the impeller;

A step S30, and a secondary dispersion step of discharging the waste having passed through the primary dispersion step to a vibrator for vibrational conveyance;

Step S40, a third dispersing step of rotating the roll brush while conveying the waste having undergone the secondary dispersion step to a first conveyor formed with an embossment formed with projections to control the thickness of the waste and disperse the waste;

Step S50, a melting step of melting the wastes through the tertiary dispersion step;

Step S60, a press molding step in which the waste having undergone the melting step is subjected to press molding by a double belt press;

Step S70, and a winding step of cooling the sheet having undergone the press forming step and winding it on a winder.

The manufacturing process of the recycled fiber reinforced plastic composite material using the continuous fiber-reinforced plastic composite material waste according to the preferred embodiment ends at step S70.

The detailed procedure of each step of the preferred embodiment of the present invention will be explained in the following detailed description.

In step S10, the waste of the continuous fiber-reinforced plastic composite material refers to scrap and waste generated in the process of manufacturing the fiber-reinforced composite material, and the fiber-reinforced composite material includes polypropylene, polyamide, polyoxymethylene, polyphenylene sulfide , Polyphthalamide, and other thermoplastic resins. The waste of the continuous fiber-reinforced plastic composite material is pulverized to a length of 5 to 20 mm by a pulverizer, a pelletizer or the like, and FIG. 2 illustrates the waste of the continuous fiber-reinforced plastic composite material pulverized in step S10.

In step 20, the primary dispersion occurs in the feeder into which the waste of continuous fiber-reinforced plastic composite material pulverized in step S10 is fed. 3, an impeller 210 is formed in the feeder 200. The impeller 210 has a rotation axis 211 for rotating the feeder 200, and a plurality of guide rods 210 formed in a direction perpendicular to the rotation axis. And a brush 213 formed on one surface of the guide rod 212 which is in contact with the inner surface of the feeder 200. It is possible to obtain an effect of preventing the waste that has been subjected to the pulverization step from coming into contact with the inner surface of the feeder by the above-described feeder so as not to stick to the inner wall of the feeder.

3, each of the plurality of guide rods 212 may be formed alternately to the left or right in the direction of the gravity, or alternatively may be formed in the left or right direction Or the right guide rod and the left guide rod may be formed at the same height of the rotary shaft 211. However, the present invention is not limited to this structure as long as the waste fiber of the continuous fiber-reinforced plastic composite material is agitated in the step S10.

The brushes 213 may be selected from a material having a strength enough to allow the waste of the continuous fiber-reinforced plastic composite material to move, i.e., disperse, without damaging the inner wall of the feeder 200.

The waste of the continuous fiber-reinforced plastic composite material is injected into the feeder, and is moved to the inner surface of the feeder by the rotation of the impeller 210, so that the waste may adhere to the inner surface of the feeder and be lumped. As the impeller 210 rotates, the brush 213 formed on the impeller 210 rotates and contacts the inner surface of the feeder to rotate the waste 100 of the continuous fiber-reinforced plastic composite material, And can be discharged to the lower end of the feeder 200. The ionizer 220 is formed at the lower end of the feeder 200 to remove the static electricity generated due to the mutual friction between the waste 100 of the continuous fiber-reinforced plastic composite material discharged from the feeder 200, Can be removed.

In the step S30, the secondary dispersion step is a step of discharging the waste of the continuous fiber-reinforced plastic composite material stirred in the step S20 to the vibrator and carrying the vibration.

4 to 5, the waste 100 of the continuous fiber-reinforced plastic composite material discharged to the feeder 200 is seated on the vibrator 300. The vibrator 300 has a plurality of holes 310 formed on one surface of the vibrator 300 in contact with the waste 100 of the continuous fiber-reinforced plastic composite material. The holes 310 are for removing impurities contained in the waste 100 of the continuous fiber-reinforced plastic composite material. The holes 310 may be made of a material having a length of 5 to 20 mm or less, And may be formed into a streamlined shape such as a polygonal shape or a circular shape. As shown in FIG. 5, the plurality of holes 310 may be formed in a plurality of rows in a row, or may be formed by being poured into a specific area or randomly formed.

The waste 100 of the continuous fiber-reinforced plastic composite material placed on one side of the vibrator 300 through the primary dispersion step is conveyed by the vibration of the vibrator 300, A foreign matter may be inserted and the foreign matter may be removed from the waste.

In step S40, the tertiary dispersion step is a step of brushing the waste of the continuous fiber-reinforced plastic composite material from which foreign matter has been removed in step S30. Referring to FIG. 6, the wastes 110 of the continuous fiber-reinforced plastic composite material from which the foreign matter has been removed are transferred from the vibrator to the first conveyor 400 and transferred to the second conveyor 700 (see FIG. 7). The first conveyor 400 is formed in an embossed structure in which the protrusions 410 are protruded so that the waste 110 of the continuous fiber-reinforced plastic composite material from which the foreign matter is removed is positioned between the protrusions 410 of the embossed structure do. The roll brush 500 is positioned at a predetermined distance from the first conveyor 400 and rotates in a clockwise direction so that the roll brush protrusions 510 are separated from the first conveyor protrusions 410, A brushing dispersion operation is performed in which the fiber-reinforced plastic composite material 110 is rolled up and dispersed. The predetermined interval affects the thickness of the continuous fiber-reinforced plastic composite material waste, and the thickness of the continuous fiber-reinforced plastic composite material waste may become thicker as the distance from the continuous fiber-reinforced plastic composite material waste increases. The thickness of the material waste can be thinned.

The waste separated from the first conveyor 400 among the wastes 110 of the continuous fiber-reinforced plastic composite material from which the dispersed foreign materials are removed due to the brushing dispersion operation can be collected in the right and left spaces of the first conveyor 400. The collected waste can be used for recycling.

In step S50, the melting step is a step of melting the waste of the continuous fiber-reinforced plastic composite material through the third dispersion step. 7, the waste of the continuous fiber-reinforced plastic composite material from which the foreign matter transferred to the second conveyor 700 is removed is melted in the melter 600 to become the molten waste 120. The melter 600 is a melting machine including at least one of a convection oven and an IR direct light heater. The melter 600 is disposed between the lower melter located inside the second conveyor 700 and the outer surface of the second conveyor 700, Is formed into a distant upper melting vessel. The waste of the continuous fiber-reinforced plastic composite material from which the foreign matter has been removed is transferred from the second conveyor and melted by passing between the lower melting furnace and the upper melting furnace.

In step S60, the press forming step is a step of press-molding the molten waste using a double belt press. The fused waste 120 is conveyed to the double belt press 800 and pressed. Further, before proceeding to the press forming step, a film or tape having a high heat-resistant characteristic of polyimide or Teflon is applied to a molten waste and pressed by a double belt press to improve surface quality and moldability .

In step S70, the cooling and winding step is a step in which the press-molded molten waste is cooled through a cooling zone (not shown), and wound by a winder 900 to form a recycled sheet 130 having a predetermined thickness.

According to another preferred embodiment of the present invention, there is provided a reclaimed sheet produced by a process for producing a recycled fiber-reinforced plastic composite material using continuous fiber-reinforced plastic composite material waste.

The recycled sheet has dispersibility, thickness uniformity, and excellent appearance quality, and can minimize physical property variations. In addition, the recycled sheet can be used for vehicle parts and building materials requiring relatively low physical properties compared to conventional plastic continuous fiber composite materials, because production costs are low.

100: Waste of continuous fiber reinforced plastic composite material
110: Waste of continuous fiber-reinforced plastic composite material from which foreign matter has been removed
120: Waste of molten continuous fiber reinforced plastic composite material
130: Playback sheet
200: feeder 210: impeller
211: impeller rotating shaft 212: brush guide rod
213: Brush 220: Ionizer
300: vibrator 310: hole
400: first conveyor 410: projection
500: roll brush 510: roll brush projection
600: Melting machine 700: Second conveyor
800: Double Belt Press 900: Winder

Claims (7)

A pulverizing step of putting the waste of the continuous fiber-reinforced plastic composite material into a pulverizer and pulverizing the pulverizer to a length of 5 to 20 mm;
A first dispersing step in which the waste having been subjected to the pulverizing step is put into a feeder equipped with an impeller and dispersed through rotation of the impeller;
A secondary dispersion step of discharging the waste having undergone the primary dispersion step with a vibrator and transporting the vibration;
The waste having been subjected to the second dispersion step is transferred to a first conveyor formed in an embossed shape by projecting the projections while rotating a roll brush located at an upper portion spaced apart from the first conveyor by brushing and dispersing, A dispersing step;
A melting step of melting the waste through the third dispersion step;
A press forming step of press-molding the waste having undergone the melting step by a double belt press; And
And a winding step of cooling the sheet subjected to the press forming step and winding it on a winder. 2. The method of claim 1, wherein the feeder equipped with the impeller in the primary dispersion step has an impeller formed inside the feeder, the impeller having a rotation shaft for rotating the guide shaft and a plurality of guide rods formed in a direction perpendicular to the rotation shaft, And a brush formed on one surface of the guide rod which is in contact with the inner surface of the feeder. The method of manufacturing a regenerated fiber-reinforced plastic composite material according to claim 1, wherein the secondary dispersion step removes foreign matter from wastes subjected to a primary dispersion step of the vibrator alone during vibration transfer of the vibrator. The method of claim 1, wherein the third dispersing step comprises collecting wastes separated from the first conveyor among the wastes dispersed by the roll brushes in the first and second conveyors. The method according to claim 1, wherein the melting step comprises melting a waste from the third dispersion step with a melting machine including at least one of a convection oven and an IR direct light heater surrounding the path of the conveyor, Method of manufacturing composite material. The method for producing a regenerated fiber-reinforced plastic composite material according to claim 1, wherein the press molding step comprises press molding the waste material subjected to the melting step using a double belt press. A regenerated sheet produced by the method for producing a regenerated fiber-reinforced plastic composite material according to any one of claims 1 to 6.

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