KR102304314B1 - 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 method for manufacturing a recycled composite sheet using plastic composite material waste.
Recycled fiber-reinforced plastic sheet and its produced through melting and press molding after crushing scraps in a grinder using scraps and wastes generated in the process of manufacturing continuous fiber-reinforced plastic composite materials, and evenly dispersing the crushed scraps A manufacturing method is provided.

Description

The method for manufacturing a recycled fiber-reinforced plastic composite material using continuous fiber-reinforced plastic composite material waste and a random sheet manufactured by the method }

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 manufactured by the method.

In the manufacturing process of the plastic composite material and parts manufacturing process, there is a problem in that a significant amount of plastic composite material scrap is additionally generated when the target plastic composite material is manufactured, and waste such as defective products and damaged products of the plastic composite material product is also generated.

Although there are methods such as recycling, incineration, and landfilling as a treatment method for scrap, defective products and waste of plastic composite materials, the landfill of plastic composite materials not only causes fatal environmental pollution, but also takes hundreds of years or more to decompose. have. Incineration of plastic composite materials may cause environmental pollution such as air pollution and land pollution due to harmful gases generated during incineration, or may cause problems that may have a harmful effect on the human body and animals and plants.

Accordingly, a technology for a method of recycling and regenerating a plastic composite material rather than a method of incineration and landfill of the plastic composite material is being developed.

Looking at the patent literature disclosed in the prior art in relation to the method of regenerating the plastic composite material, for example, through Korean Patent Application Laid-Open No. 10-2017-0096287, a bath filled with thermal oil is installed inside the bath and is installed inside the bath by rotational force. A barrel that can transport materials and has a through hole through which thermal oil can enter and exit, and heat melts waste plastic in direct contact with thermal oil, a supply means that supplies waste plastic to the barrel inlet, and the outlet of the barrel Disclosed is a waste plastic recycling device including a transport means for transporting undissolved waste plastic.

However, in the conventional waste plastic recycling apparatus, the dispersibility of the waste plastic formed by being regenerated from the waste plastic recycling apparatus may cause a problem of surface glue deterioration such as fiber protrusion and agglomeration, and there may be a large deviation in physical properties. There may be a disadvantage that the thickness uniformity of the finished product is not uniform.

Accordingly, the present inventors confirmed that, in order to solve the above problems, when a random sheet is manufactured by a method of manufacturing a recycled fiber-reinforced plastic composite using continuous fiber-reinforced plastic composite material waste, it is possible to minimize the degradation of dispersibility and physical properties. and completed the present invention.

An object of the present invention is to have excellent dispersibility, so that the finished product has excellent thickness uniformity, and continuous fiber-reinforced plastic composite material waste that can minimize variations in physical properties by improving surface quality deterioration problems such as fiber protrusion and agglomeration An object of the present invention is to provide a method for manufacturing a recycled fiber-reinforced plastic composite using

The present invention also intends to provide a random sheet manufactured by a method for manufacturing a recycled fiber-reinforced plastic composite using continuous fiber-reinforced plastic composite material waste.

As a first preferred embodiment according to the present invention, a pulverizing step of putting the waste of the continuous fiber-reinforced plastic composite material into a pulverizer and pulverizing it to a length of 5 to 20 mm; a primary dispersing step in which the waste that has undergone the crushing step is put into a feeder equipped with an impeller and dispersed through rotation of the impeller; a second dispersing step of discharging the waste that has undergone the first dispersing step to a vibrator and vibrating it; The waste that has passed through the secondary dispersion step is transferred to a first conveyor formed in an embossed shape with protrusions protruding, while rotating a roll brush located at an upper portion spaced apart from the first conveyor by brushing and dispersing dispersion step; a melting step of melting the waste that has undergone the tertiary dispersion step; a press forming step of press forming the waste that has passed through the melting step with a double belt press; And it provides a method of manufacturing a recycled fiber-reinforced plastic composite material comprising a winding step of cooling the sheet that has undergone the press forming step and wound on a winder.

In the first dispersing step, the feeder equipped with an impeller has an impeller formed inside the feeder, and the impeller is formed in a direction orthogonal to a rotation shaft for rotation and the rotation shaft, and a plurality of guide rods and a feeder among one surface of the guide rod. It is characterized in that it consists of a brush formed on one surface in contact with the inner surface of the.

The secondary dispersion step is characterized in that foreign substances are removed from the waste that has undergone the primary dispersion step into the hole of the vibrator during vibration transfer of the vibrator.

The third dispersing step is characterized in that the waste separated from the first conveyor among the wastes dispersed by the roll brush is collected in the left and right spaces of the first conveyor.

The melting step is characterized in that the waste from the third dispersing step is melted with a melter including at least one of a convection oven wrapping a path of a conveyor and an IR direct light heater.

The press forming step is characterized in that the waste that has passed through the melting step is press-formed using a double belt press.

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

By the configuration as described above, the manufacturing method of the recycled fiber-reinforced plastic composite using the continuous fiber-reinforced plastic composite material waste according to the present invention is price competitive because it does not consume raw material costs excluding the process cost by recycling the waste, Compared to recycled fiber-reinforced plastic composites, it is possible to provide excellent appearance quality and thickness uniformity by minimizing deviations in physical properties by improving dispersibility and surface quality degradation.

1 is a flow chart of a manufacturing process of a recycled fiber-reinforced plastic composite using a continuous fiber-reinforced plastic composite material waste according to an embodiment of the present invention.
Figure 2 is a photograph of crushing the waste of step S10 by size.
3 is a perspective view showing the feeder in 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 diagram 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 should be understood that the following description describes the present invention by way of specific examples, and the technical spirit of the present invention is not limited to the following description. And, the accompanying drawings are provided to help the understanding of the present invention, and the technical spirit of the present invention is not limited to the accompanying drawings.

In addition, the thickness of the lines shown in the drawings, the size of components, etc. may be exaggerated or reduced for clarity and convenience of explanation, and the terms described in this specification are terms defined in consideration of functions in the present invention. , the above terms may vary according to the intention or custom of the operator. Therefore, definitions of terms described in this specification should be interpreted based on the content throughout this specification.

According to a preferred embodiment of the present invention, a crushing step of putting the waste of the continuous fiber-reinforced plastic composite material into a crusher and crushing it to a length of 5 to 20 mm; Putting the waste that has undergone the crushing step into a feeder equipped with an impeller a first dispersion step of being dispersed through the rotation of the impeller; a second dispersing step of discharging the waste that has undergone the first dispersing step to a vibrator and vibrating it; The waste that has passed through the secondary dispersion step is transferred to a first conveyor formed in an embossed shape with protrusions protruding, while rotating a roll brush located at an upper portion spaced apart from the first conveyor by brushing and dispersing dispersion step; a melting step of melting the waste that has undergone the tertiary dispersion step; a press forming step of press forming the waste that has passed through the melting step with a double belt press; And to provide a method of manufacturing a recycled fiber-reinforced plastic composite material comprising a winding step of cooling the sheet that has undergone the press forming step and wound on a winder.

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

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

A method of manufacturing a recycled fiber-reinforced plastic composite using the continuous fiber-reinforced plastic composite material waste of the present invention with reference to FIG. 1 will be described as follows.

Step S10, the continuous fiber-reinforced plastic composite material waste is put into a crusher and includes a crushing step of pulverizing to a length of 5 to 20 mm;

Step S20, including a primary dispersing step in which the waste that has undergone the crushing step is put into a feeder equipped with an impeller and dispersed through rotation of the impeller;

Step S30, including a secondary dispersion step of discharging the waste that has undergone the primary dispersion step to a vibrator and vibrating;

Step S40, including a tertiary dispersion step of controlling and dispersing the thickness of the waste by rotating a roll brush while transferring the waste that has undergone the secondary dispersing step to the first conveyor in which the protrusions are formed and formed in the embossed form;

Step S50, including a melting step of melting the wastes that have passed through the tertiary dispersion step;

Step S60, a press forming step of press forming the waste that has passed through the melting step with a double belt press;

Step S70, cooling the sheet that has undergone the press forming step and includes a winding step of winding in a winder.

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

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

In step S10, the waste of the continuous fiber-reinforced plastic composite material means scrap and waste generated in the manufacturing process of the fiber-reinforced composite material, and the fiber-reinforced composite material is polypropylene, polyamide, polyoxymethylene, polyphenylene sulfide , and may include one or more resins selected from thermoplastic resins such as polyphthalamide. The waste of the continuous fiber-reinforced plastic composite material is pulverized to a length of 5 to 20 mm by a grinder, a pelletizer, etc., Figure 2 shows the waste of the continuous fiber-reinforced plastic composite material pulverized in step S10 by size.

In step 20, the primary dispersion is generated in a feeder into which the waste of the continuous fiber-reinforced plastic composite material pulverized in step S10 is input. Referring to FIG. 3 , the feeder 200 has an impeller 210 formed therein, and the impeller 210 includes a rotation shaft 211 for rotating and a guide rod formed in a direction orthogonal to the rotation shaft and made of a plurality of guide rods. 212 and a brush 213 formed on one surface of one surface of the guide rod 212 in contact with the inner surface of the feeder 200 . It is possible to obtain the effect of preventing the waste that has undergone the crushing step in contact with the inner surface of the feeder from sticking to the inner wall of the feeder by the above-described feeder.

In addition, the individual positions of each of the plurality of guide rods 212 are divided left and right based on the rotation axis as shown in FIG. 3 , and in the direction of gravity, they may be alternately formed to the right and left, or to the left and right. Alternatively, the right guide rod and the left guide rod may be formed at the same height of the rotation shaft 211, but if the structure is for agitating the waste of the continuous fiber-reinforced plastic composite material that is crushed and input in step S10, it is not limited thereto.

The brush 213 may be selected from a material having a level of strength that can move, that is, disperse the waste of the continuous fiber-reinforced plastic composite material without damaging the inner wall of the feeder 200 .

The waste of the continuous fiber-reinforced plastic composite material may be put into the feeder and moved to the inner surface of the feeder by the rotation of the impeller 210 to stick to the inner surface of the feeder and form lumps. As the impeller 210 rotates, the brush 213 formed on the impeller 210 rotates and comes into contact with the feeder inner surface and adheres to the feeder inner surface. Waste 100 of the continuous fiber-reinforced plastic composite material. can be separated and discharged to the lower end of the feeder 200 . By forming the ionizer 220 at the lower end of the feeder 200 to remove the static electricity generated due to the mutual friction of the waste 100 of the continuous fiber-reinforced plastic composite material discharged from the feeder 200, dispersion obstacles can be removed.

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

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 is formed with a plurality of holes 310 on one surface in contact with the waste 100 of the continuous fiber-reinforced plastic composite material. The hole 310 is for removing foreign substances contained in the waste 100 of the continuous fiber-reinforced plastic composite material. It may be formed in a streamlined shape such as a polygonal shape or a circular shape. The plurality of holes 310 may be formed in a plurality of rows in a row as shown in FIG. 5 , and may be formed in a cluster in a specific area or may be formed in an arbitrarily clustered area.

The waste 100 of the continuous fiber-reinforced plastic composite material seated on one surface of the vibrator 300 through the first dispersion step is transported by the vibration of the vibrator 300 and is contained in the waste in the hole 310 of the vibrator. A foreign material may be inserted and the foreign material may be removed from the waste.

In step S40, the third dispersing step is a step of brushing the waste of the continuous fiber-reinforced plastic composite material from which foreign substances are removed in step S30. Referring to FIG. 6 , the waste 110 of the continuous fiber-reinforced plastic composite material from which the foreign material is removed is transferred from the vibrator to the first conveyor 400 , and transferred to the second conveyor (see FIG. 7 , 700 ). The first conveyor 400 is formed in an embossed structure in which the protrusions 410 protrude, so that the waste 110 of the continuous fiber-reinforced plastic composite material from which the foreign substances are removed is located between the protrusions 410 of the embossed structure. do. The roll brush 500 is located at a height spaced apart from the first conveyor 400 by a predetermined distance, and the roll brush protrusion 510 rotates in a clockwise direction to remove foreign substances accumulated over the first conveyor protrusion 410 . A brushing dispersion operation of removing and dispersing the fiber-reinforced plastic composite material 110 is carried out. The predetermined interval affects the thickness of the continuous fiber-reinforced plastic composite material waste, and as the predetermined interval increases, the thickness of the continuous fiber-reinforced plastic composite material waste may become thicker, and as the predetermined interval narrows, the continuous fiber-reinforced plastic composite The thickness of the material waste can be reduced.

The waste separated by the first conveyor 400 among the waste 110 of the continuous fiber-reinforced plastic composite material from which foreign substances dispersed due to the brushing and dispersing operation are removed may be collected in the left and right 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 that has undergone the tertiary dispersion step. Referring to FIG. 7 , the waste of the continuous fiber-reinforced plastic composite material from which foreign substances are removed transferred to the second conveyor 700 is melted in the melter 600 to become the molten waste 120 . The melter 600 is a melter including at least one of a convection oven and an IR direct light heater, and a lower melter positioned inside the second conveyor 700 and the outer surface of the second conveyor 700 at a predetermined interval It is formed by a fallen top melter. The waste of the continuous fiber-reinforced plastic composite material from which the foreign material has been removed is melted by passing between the lower melter and the upper melter while being transferred from the second conveyor.

In step S60, the press forming step is a step of press forming the molten waste using a double belt press. The molten waste 120 is transferred to a double belt press 800 and compressed. In addition, before the press forming step proceeds, a film or tape having high heat resistance of polyimide and Teflon is added to the molten waste and formed while being pressed by a double belt press to improve the surface quality and formability. can

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

According to another preferred embodiment of the present invention, it is to provide a recycled sheet manufactured by a manufacturing process of a recycled fiber-reinforced plastic composite using continuous fiber-reinforced plastic composite material waste.

The regenerated sheet has dispersibility, thickness uniformity, and excellent appearance quality, and may realize a minimization of variation in physical properties. In addition, the reclaimed sheet can be used for vehicle parts and construction materials that require relatively low physical properties compared to the existing plastic continuous fiber composite material while reducing production costs.

100: waste of continuous fiber-reinforced plastic composite material
110: waste of continuous fiber-reinforced plastic composite material from which foreign substances are removed
120: waste of molten continuous fiber-reinforced plastic composite material
130: play sheet
200: feeder 210: impeller
211: impeller rotation shaft 212: brush guide rod
213: brush 220: ionizer
300: vibrator 310: hall
400: first conveyor 410: projection
500: roll brush 510: roll brush turn
600: melter 700: second conveyor
800: double belt press 900: winder

Claims (7)

A grinding step of putting the waste of the continuous fiber-reinforced plastic composite material into a grinder and pulverizing it to a length of 5 to 20 mm;
a first dispersing step in which the waste that has undergone the crushing step is put into a feeder equipped with an impeller and dispersed through rotation of the impeller;
a second dispersing step of discharging the waste that has passed through the first dispersing step to a vibrator and vibrating it;
The waste that has passed through the secondary dispersion step is transferred to a first conveyor formed in an embossed shape with protrusions protruding, while rotating a roll brush located at an upper portion spaced apart from the first conveyor by brushing and dispersing dispersion step;
a melting step of melting the waste that has undergone the tertiary dispersion step;
a press forming step of press forming the waste that has passed through the melting step with a double belt press; and
A method of manufacturing a recycled fiber-reinforced plastic composite material comprising a winding step of cooling the sheet that has undergone the press molding step and winding it on a winder. According to claim 1, wherein in the first dispersing step, the feeder to which the impeller is mounted has an impeller formed inside the feeder, and the impeller is formed in a direction orthogonal to a rotation shaft for rotating and the rotation shaft, and a plurality of guide rods and A method of manufacturing a recycled fiber-reinforced plastic composite material, characterized in that it comprises a brush formed on one surface of the guide rod in contact with the inner surface of the feeder. The method according to claim 1, wherein, in the secondary dispersion step, foreign substances are removed from the waste that has undergone the primary dispersion step into the hole of the vibrator during vibration transfer of the vibrator. According to claim 1, wherein the third dispersing step is a method of manufacturing a recycled fiber-reinforced plastic composite material, characterized in that the waste separated from the first conveyor among the waste dispersed by the roll brush is collected in the left and right spaces of the first conveyor. The recycled fiber-reinforced plastic according to claim 1, wherein the melting step melts the waste from the tertiary dispersing step with a melter comprising at least one of a convection oven surrounding a path of a conveyor and an IR direct light heater. A method for manufacturing a composite material. According to claim 1, wherein the press forming step is a method of manufacturing a recycled fiber-reinforced plastic composite material, characterized in that the press-molding using a double belt press the waste that has passed through the melting step. A recycled sheet manufactured by the method for manufacturing the recycled fiber-reinforced plastic composite material according to any one of claims 1 to 6.

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