WO2016011934A1

WO2016011934A1 - Molded wire and preparation method therefor

Info

Publication number: WO2016011934A1
Application number: PCT/CN2015/084689
Authority: WO
Inventors: 宋道权
Original assignee: 珠海天威飞马打印耗材有限公司
Priority date: 2014-07-23
Filing date: 2015-07-21
Publication date: 2016-01-28
Also published as: CN104231524A

Abstract

The present invention provides a high-precision molded wire for printing a high quality three-dimensional object. The molded wire has the following components with their content in parts by weight: 1 to 3 parts of a saline coupling agent, 5 to 40 parts of glass beads and 57 to 94 parts of resin. The present invention also provides a preparation method for the molded wire, comprising a modification step, a mixing step and a wire drawing step.

Description

Forming wire and preparation method thereof

The invention relates to a material for an extrusion type rapid prototyping device and a preparation method thereof, in particular to a forming wire for melt extrusion molding and a preparation method thereof. The present invention is based on a Chinese patent application filed on July 23, 2014, the application number of which is incorporated herein by reference.

A three-dimensional printer is a device that constructs a three-dimensional object by layer-by-layer printing based on a digital model using materials such as powdered metal or plastic. One of the three-dimensional printers supplies a molding material, that is, a forming yarn, to the print head in the form of a filament. The forming wire is heated to a molten state by electric heating in the print head, and the print head prints a three-dimensional object layer by layer according to a command from the three-dimensional printer controller to the movement path of the printing head relative to the stage.

A three-dimensional printer for supplying a molding material to a print head by a forming wire is disclosed in the patent document No. CN1216726C. Referring to Fig. 1, a forming wire 013 is wound around a supply tray 011 and mounted on a three-dimensional printer supply tray. The rotating shaft 012 of the mounting frame is attached to the forming head 013 to the print head 015 of the three-dimensional printer. During use, the forming wire 013 is pulled out from the feeding tray 011, so that the straightened forming wire passes through the conduit 014 made of a material having a small frictional resistance until the forming wire is supplied onto the printing head 015. The feeding rollers 0152 and 0153 driven by the motor 0154 are driven by the feeding rollers 0152 and 0153, and the forming wire enters the liquefier 0151. The forming wire is heated into a molten state in the liquefier 0151, and the forming wire is pushed in the subsequent state. By the action, it is extruded from the printing nozzle 01151 provided at the lower end of the liquefier 0151 and deposited on the stage.

In the above printing process, the feeding roller driven by the motor pushes the forming wire into the liquefier to produce a "liquefier pumping effect", that is, the forming wire itself is equivalent to a piston, and the forming wire entering the liquefier is extruded and melted. The material is extruded from the print nozzle at a rate of volume. The volumetric rate of the shaped material extruded from the print nozzle is a function of the rate at which the shaped filament enters the liquefier, so the rate of extrusion of the shaped material from the print nozzle can be controlled by controlling the rate at which the shaped filament enters the liquefier. On the one hand, the controller controls the movement of the print head in the horizontal XY plane, and on the other hand controls the movement of the base along the vertical Z axis, and also controls the rate at which the feed roller pushes the forming wire into the liquefier, by controlling these variables synchronously. The molding material can print a three-dimensional object layer by layer along a path determined by a computer-designed model.

The accuracy of the three-dimensional object printed by the three-dimensional printer depends on the precision of the supply of the forming wire. When the cross-sectional area of the forming wire changes, the volume rate of the molding material extruded from the printing nozzle will change accordingly, thereby reducing the printing quality of the three-dimensional object. . For example, when the diameter of the forming wire is too large compared to the standard diameter, too much molding material is extruded from the printing nozzle per unit time, resulting in excessive deposition of the molding material at the printing place, where the printing thickness is relatively the same as the other layer. The area is too thick and forms a bump after solidification, which destroys the reference surface of the subsequent printing; similarly, when the diameter of the forming wire is too small, the molding material at the printing portion may be lacking or lagging, resulting in too much porosity of the deposited layer, printing The three-dimensional object has a poor surface finish and cannot achieve the desired structural strength. Both of these conditions reduce the print quality of 3D objects.

In order to reduce the influence of the change in the diameter of the forming wire on the print quality of the three-dimensional object, it is required that the molding material can be extruded from the printing head at a constant volume rate, and further, when the moving speed of the printing head in the XY plane is increased, molding is performed. The volumetric rate at which the material is extruded from the print nozzle is also correspondingly increased, ie, the volumetric rate of the shaped filament entering the liquefier is required to be precisely controlled, and the volumetric rate is the rate at which the shaped filament enters the liquefier and the cross-sectional area of the shaped filament. product.

In order to achieve control of the volume rate of the forming wire into the liquefier, the patent document of US Pat. No. 6,085,957 discloses a technical solution for the instantaneous detection of the diameter of the forming wire when the forming wire enters the liquefier and is controlled by The rotational speed of the feed roller is instantaneously adjusted for the rate of advancement of the forming wire that subsequently enters the liquefier to achieve control of the volume rate of the shaped wire into the liquefier. Although the technical solution can realize the instantaneous control of the volume rate and improve the print quality of the three-dimensional object, there are still the following disadvantages: each 3D printer needs to be equipped with one sensor, which increases the equipment cost; due to the hysteresis of detection and control, it still There is a certain error.

To achieve the control of the volume rate of the forming wire into the liquefier, the most fundamental solution is to produce a high-precision forming wire. Since the forming wire is manufactured by the wire drawing process, the internal stress distribution of the forming wire during the drawing process is not Uniform, uneven shrinkage during cooling is the main reason for the low precision of the forming wire.

SUMMARY OF THE INVENTION A primary object of the present invention is to provide a high precision forming wire for printing high quality three-dimensional objects.

Another object of the present invention is to provide a method for producing the above-described high-precision shaped yarn.

In order to achieve the above main object, the present invention provides a shaped yarn in parts by weight and a composition and content thereof:

Silane coupling agent 1-3 parts;

Glass beads 5-40 parts;

Resin 57-94 parts.

Specifically, the above resin is ABS resin, PLA resin, PC resin, PMMA resin, PP resin, PA resin, HIPS resin or PBT resin.

In order to achieve the above main object, the present invention provides a shaped yarn in parts by weight, the raw material composition and content of which are:

Silane coupling agent 1-3 parts;

Glass beads 5-40 parts;

57-94 parts of resin;

And prepared according to the following steps, the modification step: the silane coupling agent and the glass microbeads are stirred for 10 minutes to 30 minutes under the stirring speed of 1000 rpm to 100 rpm, that is, within the above range , the stirring speed is slow, the stirring time is correspondingly long, and the mixture is dispersed and mixed to form a modified mixture; the mixing step: adding the resin to the modified mixture, and stirring at a stirring speed of 1000 rpm to 100 rpm. Minutes - 30 minutes, dispersion mixing to form a raw material mixture; drawing step: drawing the raw material mixture into a forming wire of a prescribed diameter in a filament forming apparatus.

It can be seen from the above scheme that the glass microbeads are modified by the modification step, thereby improving the interfacial bonding performance of the glass microbeads and the resin in the mixing step, the preparation method is simple, and the cost of the forming filaments is reduced, thereby preparing High-precision forming wire with low price is conducive to the promotion and application of 3D printing technology.

Silane coupling agent 1-3 parts;

Glass beads 5-40 parts;

57-94 parts of resin;

And the following steps are obtained: a modification step: stirring the silane coupling agent and the resin at a stirring speed of 1000 rpm to 100 rpm for 10 minutes to 30 minutes, and dispersing and mixing to form a modified mixture; Mixing step: adding glass beads to the modified mixture, stirring at a stirring speed of 1000 rpm to 100 rpm for 10 minutes to 30 minutes, dispersing and mixing to form a raw material mixture; drawing step: mixing the raw material mixture A shaped wire of a prescribed diameter is drawn in a filament forming apparatus.

It can be seen from the above scheme that the resin is modified by the modification step, thereby improving the interfacial bonding property of the glass microbead and the resin in the mixing step, the preparation method is simple, and the cost of the forming yarn is reduced, so that a low price can be prepared. The high-precision forming wire is beneficial to the promotion and application of three-dimensional printing technology.

In order to achieve another object of the present invention, the present invention provides a method for preparing a shaped yarn comprising the following steps: a modification step of: 1-3 parts by weight of a silane coupling agent and 5-40 parts of glass beads in parts by weight Stirring at a stirring speed of 1000 rpm to 100 rpm for 10 minutes to 30 minutes, dispersing and mixing to form a modified mixture; mixing step: adding 57-94 parts of the resin to the modified mixture at a stirring speed Stirring for 10 minutes to 30 minutes under conditions of 1000 rpm to 100 rpm, dispersion mixing to form a raw material mixture; drawing step: drawing the raw material mixture into a forming wire of a prescribed diameter in a filament forming apparatus.

It can be seen from the above scheme that the formed yarn obtained by the method has good roundness and small diameter standard deviation in the longitudinal direction, and the printed three-dimensional object has stable size, good smooth surface and good strength; The preparation method is simple, and is beneficial to reducing the cost of the forming wire, thereby preparing a high-precision forming wire with low price, which is beneficial to the promotion and application of the three-dimensional printing technology.

In order to achieve another object of the present invention, the present invention provides a method for preparing a shaped yarn comprising the following steps: a modification step of adding 1-3 parts of a silane coupling agent and 57-94 parts of a resin at a stirring speed in parts by weight Stirring for 10 minutes to 30 minutes under conditions of 1000 rpm to 100 rpm, dispersion mixing to form a modified mixture; mixing step: adding 5-40 parts of glass beads to the modified mixture at a stirring speed Stirring for 10 minutes to 30 minutes under conditions of 1000 rpm to 100 rpm, dispersion mixing to form a raw material mixture; drawing step: drawing the raw material mixture into a forming wire of a prescribed diameter in a filament forming apparatus.

The forming wire of the invention has good roundness, and is more likely to cooperate with the liquefier to form a "liquefier pump" effect, and does not increase the resistance between the liquefier inlet, and does not get stuck in the inlet of the liquefier to affect the feeding of the liquefier. Stability; capable of reducing the change in the volume rate of the supply of the forming wire to the liquefier; ensuring a small change in the volume rate of extrusion from the printing nozzle, and printing a high-quality three-dimensional object in accordance with a three-dimensional model of the computer design, and It is easy to control the volume rate of the extruded material by controlling the rate of the feeding roller; it can also effectively prevent the printed three-dimensional object from protruding due to excessive supply of the partial molding material, and ensure the printing quality of the three-dimensional object; Preventing the printed three-dimensional object from appearing due to insufficient supply of the locally supplied molding material, and ensuring the strength of the three-dimensional object; in addition, the internal stress distribution of the three-dimensional object printed by using the shaped yarn of the invention is uniform, no warping deformation is generated, and the three-dimensional object is ensured. The size is stable, which improves the print quality of three-dimensional objects.

1 is a schematic structural view of a conventional three-dimensional printer;

2 is a schematic structural view of a conventional filament forming apparatus;

Figure 3 is a flow chart showing an embodiment of a method for preparing a shaped yarn of the present invention;

Figure 4 is a list of raw material components and parts by weight of the first to fourth embodiments of the method for producing the shaped yarn of the present invention;

Figure 5 is a list of raw material components and parts by weight of the fifth to eighth embodiments of the method for producing the shaped yarn of the present invention;

Figure 6 is a list of raw material components and parts by weight of the ninth to twelfth embodiments of the method for producing the shaped yarn of the present invention;

Figure 7 is a list of raw material components and parts by weight of the thirteenth to sixteenth embodiments of the method for producing the shaped yarn of the present invention;

Figure 8 is a list of raw material components and parts by weight of the seventeenth to twentieth embodiments of the method for producing the shaped yarn of the present invention;

Figure 9 is a list of raw material components and parts by weight of the twenty-first to twenty-fourth embodiments of the method for producing the shaped yarn of the present invention;

Figure 10 is a list of raw material components and parts by weight of the twenty-fifth to twenty-eighth embodiments of the method for producing the shaped yarn of the present invention;

Figure 11 is a list of raw material components and parts by weight of the twenty-ninth to thirty-second embodiments of the method for producing the shaped yarn of the present invention.

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

The conventional conventional forming wire has a diameter of 1.75 mm and 3 mm. The following specific embodiments illustrate the preparation of a 1.75 mm forming wire as an example to describe a specific embodiment of the present invention.

The drawing step in the method for producing a shaped yarn of the present invention is carried out by using a filament forming apparatus and method disclosed in the patent document No. CN100558961C.

Referring to Fig. 2, the filament forming apparatus is composed of a screw extruder 1, an air knife 2, a cooler 3, a two-axis laser micrometer 4, a puller 5, a controller 6, and a reel 7. The screw extruder 1 is composed of a servo motor 11, a heating cylinder 12, a hopper 13, a screw 14, and a die 15.

Referring to Fig. 3, the preparation method of the shaped yarn of the present invention comprises a modification step, a mixing step and a drawing step.

Wherein, the drawing step is to put the raw material mixture 02 obtained by mixing the mixing steps into the hopper 13 of the screw extruder, the raw material mixture 02 is sent into the heating cylinder 12 and heated to melt, and the servo motor 11 drives the screw 14 to drive the melting. The raw material mixture flows to the mold 15 at a certain pressure and flow rate, and the filament 03 is extruded from the discharge port of the mold 15, and the extruded filament 03 passes through the air knife 2 and the cooler 3 under the tension of the puller 5. And dual-axis laser micrometer 4. The motor in the puller 5 drives the roller 51, the roller 52, the roller 53, and the roller 54 under the control of the controller 6, thereby applying tension to the filament 03. The controller 6 measures the diameter dF of the filament 03 after cooling according to the biaxial laser micrometer 4, thereby controlling the magnitude of the tension, and accurately controlling the diameter of the finally prepared filament. The filaments obtained by cooling are formed filaments, and these shaped filaments are wound on the reel 7 by controlling the rotation speed of the reel 7.

Method for preparing shaped wire First embodiment

Modification step: the silane coupling agent KH-550 and the glass microbeads are stirred according to the modified stirring speed of the present example specified in Fig. 4 according to the contents of the respective components specified in Fig. 4, respectively. Modified mixing time, dispersion mixing to form a modified mixture;

Mixing step: adding the ABS resin to the modified mixture according to the component content of the present example specified in FIG. 4, and stirring the mixing and stirring time of the present example specified in FIG. 4 under the mixing and stirring speed condition of the present example specified in FIG. Dispersing and mixing to form a raw material mixture;

Drawing step: The raw material mixture was drawn into a forming wire having a diameter of 1.75 mm in a filament forming apparatus according to the above-described drawing step.

Method for preparing shaped wire Second embodiment

According to the content of each component of the present example specified in Fig. 4, the first embodiment was prepared by the above-mentioned method for producing a shaped yarn.

Method for preparing shaped wire Third embodiment

Method for preparing shaped wire Fourth embodiment

Method for preparing shaped wire Fifth embodiment

According to the content of each component specified in Fig. 5, the first embodiment of the above-mentioned forming method of the forming yarn was used, but the PA resin was used instead of the ABS resin.

Forming wire preparation method sixth embodiment

According to the content of each component specified in Fig. 5, the preparation method of the above-mentioned shaped yarn was carried out in the fifth embodiment.

Method for preparing shaped yarns

Method for preparing shaped wire Eighth embodiment

Method for preparing shaped wire ninth embodiment

According to the content of each component of the present example specified in Fig. 6, the first embodiment was prepared by the above-mentioned method for producing a shaped yarn, except that the ABS resin was replaced with a HIPS resin.

Forming wire preparation method tenth embodiment

According to the ninth example of the preparation method of the above-mentioned shaped yarn, the content of each component of this example is specified in Fig. 6.

Method for preparing shaped wire Eleventh embodiment

Method for preparing shaped yarns

Thirteenth embodiment of the method for preparing shaped yarn

According to the content of each component specified in this example in Fig. 7, the first embodiment of the above-mentioned forming method of the forming yarn was used, but the ABS resin was replaced with PLA resin.

Fourteenth embodiment of the method for preparing shaped yarn

According to the content of each component of this example specified in Fig. 7, the preparation of the above-mentioned forming method of the formed yarn was carried out.

Fifteenth embodiment of method for preparing shaped yarn

Sixteenth embodiment of a method for preparing a shaped yarn

Seventeenth embodiment of the method for preparing shaped yarn

According to the content of each component of this example specified in Fig. 8, the first embodiment was prepared by the above-mentioned method for producing a shaped yarn, except that PC resin was used instead of ABS resin.

Eighteenth embodiment of forming method of forming yarn

According to the content of each component of the present example specified in Fig. 8, the preparation was carried out by the seventeenth embodiment of the above-mentioned method for producing a shaped yarn.

Nineteenth embodiment of method for preparing shaped yarn

Forming wire preparation method twentieth embodiment

Forming wire preparation method twenty-first embodiment

According to the content of each component of this example specified in Fig. 9, the first embodiment was prepared by the above-mentioned method for producing a shaped yarn, except that PMMA resin was used instead of ABS resin.

Forming wire preparation method twenty-second embodiment

According to the content of each component of this example specified in Fig. 9, the preparation of the above-mentioned forming method of the shaped yarn was carried out in the twenty-first embodiment.

Forming wire preparation method twenty-third embodiment

Forming wire preparation method twenty-fourth embodiment

Forming wire preparation method twenty-fifth embodiment

According to the content of each component specified in Fig. 10, the first embodiment of the above-mentioned forming method of the forming yarn was used, but the ABS resin was replaced with a PP resin.

Forming wire preparation method twenty-sixth embodiment

According to the content of each component specified in Fig. 10, the preparation method of the above-mentioned shaped yarn was carried out in the twenty-fifth embodiment.

Forming wire preparation method twenty-seventh embodiment

Forming wire preparation method twenty-eighth embodiment

Forming wire preparation method twenty-ninth embodiment

According to the content of each component of this example specified in Fig. 11, the first embodiment of the above-mentioned forming method of the forming yarn was used, but PBT resin was used instead of ABS resin.

Thirtieth Embodiment of Preparation Method of Forming Wire

According to the content of each component of this example specified in Fig. 11, the preparation of the above-mentioned forming method of the forming yarn was carried out in the twenty-ninth embodiment.

Molding wire preparation method thirty-first embodiment

Molding wire preparation method thirty-second embodiment

In the above embodiment, the glass microbeads are first mixed with a silane coupling agent to form a modified mixture, and the modified mixture is mixed with a resin to form a raw material mixture, and then drawn into a desired shaped yarn by wire drawing; The resin is mixed with a silane coupling agent to form a modified mixture, and the modified mixture is mixed with the same amount by weight of the glass beads to form a raw material mixture, which is then drawn into a desired shaped yarn.

In the specific embodiment, the components of the corresponding parts by weight are subjected to a modification step and a mixing step to obtain a raw material mixture, and in the drawing process, since the internal stress distribution of the filament is uniform and the fluidity is good, it is easier to prepare a high-precision forming wire. Moreover, the raw material mixture has a small number of components, is simple and easy to obtain, and has a low price, and can prepare an inexpensive high-precision forming wire, which is advantageous for reducing the cost of three-dimensional printing, thereby facilitating the application of the three-dimensional printer technology; The three-dimensional object printed by the silk can effectively prevent local warping deformation and improve the print quality of the three-dimensional object due to uniform internal stress distribution.

The present invention also provides a shaped wire, and the embodiment of the shaped wire has been described in the examples of the preparation method, and will not be described again.

In the components of the forming yarn, the resin is used as a base material, the glass microbeads are used as an inorganic filler, and the silane coupling agent is used as a modifier to improve the bonding strength between the resin and the glass beads, so that the glass is improved. The beads are more uniformly dispersed in the resin. The forming yarn of the invention fully utilizes the characteristics of the isotropic and fluidity of the glass microbeads, and the filaments obtained by the drawing step of the raw materials obtained by mixing the resin, the glass microbeads and the silane coupling agent can be evenly cooled during the cooling process. The ground shrinkage and the stress distribution are uniform, thereby improving the roundness of the obtained formed yarn, and the obtained formed yarn is less likely to have local curl and has a small standard deviation of the diameter in the longitudinal direction. A well-rounded forming wire is more likely to cooperate with the liquefier to form a "liquefier pump" effect, and does not increase the resistance to the liquefier inlet due to the non-circular cross section, thereby affecting the supply of the forming wire to the liquefier. Stability of volumetric rate; forming filaments with less local crimping will not get stuck in the inlet of the liquefier and affect the stability of feeding to the liquefier; forming filaments with a small standard deviation in diameter in the length direction can reduce the supply to the liquefier The change of the volume rate of the forming wire; the stable forming volume of the forming wire can ensure a small change in the volume rate of extrusion from the printing nozzle, and can print a high-quality three-dimensional object according to a computer-designed three-dimensional model, and is easily controlled. The rate of the feeding roller realizes the control of the volume rate of the extruded material; the stable forming volume of the forming wire can also effectively prevent the convexity of the printed three-dimensional object due to the excessive supply of the partial molding material, and ensure the three-dimensional object. Print quality; stable volume of the supplied filament supply prevents the printed three-dimensional object from being locally supplied The material is insufficient and voids are formed to ensure the strength of the three-dimensional object; in addition, the internal stress distribution of the three-dimensional object printed by the forming wire of the invention is uniform, warpage is not generated, and the dimensional stability of the three-dimensional object is ensured, thereby improving the printing quality of the three-dimensional object. Because of the good fluidity of the forming yarn of the invention, the surface of the printed three-dimensional object is smooth.

Claims

The forming wire, in parts by weight, the composition and content of the forming wire are:

Silane coupling agent 1-3 parts;

Glass beads 5-40 parts;

Resin 57-94 parts.
A forming wire according to claim 1 wherein:

The resin is ABS resin, PLA resin, PC resin, PMMA resin, PP resin, PA resin, HIPS resin or PBT resin.
Shaped wire, characterized by:

The raw material composition and content of the shaped yarn are in parts by weight:

Silane coupling agent 1-3 parts;

Glass beads 5-40 parts;

57-94 parts of resin;

And follow the steps below:

The modification step: the silane coupling agent and the glass microbeads are stirred for 10 minutes to 30 minutes at a stirring speed of 1000 rpm to 100 rpm, and dispersed to form a modified mixture;

Mixing step: adding a resin to the modified mixture, stirring at a stirring speed of 1000 rpm to 100 rpm for 10 minutes to 30 minutes, and dispersing and mixing to form a raw material mixture;

Drawing step: The raw material mixture is drawn into a forming wire of a prescribed diameter in a filament forming apparatus.
A forming wire according to claim 3, wherein:

The resin is ABS resin, PLA resin, PC resin, PMMA resin, PP resin, PA resin, HIPS resin or PBT resin.
Shaped wire, characterized by:

The raw material composition and content of the shaped yarn are in parts by weight:

Silane coupling agent 1-3 parts;

Glass beads 5-40 parts;

57-94 parts of resin;

And follow the steps below:

The modification step: stirring the silane coupling agent and the resin at a stirring speed of 1000 rpm to 100 rpm for 10 minutes to 30 minutes, and dispersing and mixing to form a modified mixture;

Mixing step: adding glass beads to the modified mixture, stirring at a stirring speed of 1000 rpm to 100 rpm for 10 minutes to 30 minutes, and dispersing and mixing to form a raw material mixture;

Drawing step: The raw material mixture is drawn into a forming wire of a prescribed diameter in a filament forming apparatus.
A forming wire according to claim 5, wherein:

The resin is ABS resin, PLA resin, PC resin, PMMA resin, PP resin, PA resin, HIPS resin or PBT resin.
The preparation method of the forming wire comprises the following steps:

Modification step: 1-3 parts of silane coupling agent and 5-40 parts of glass beads are stirred for 10 minutes in a stirring speed of 1000 rpm to 100 rpm according to parts by weight - 30 minutes, dispersion mixing to form a modified mixture;

Mixing step: adding 57-94 parts of the resin to the modified mixture, stirring at a stirring speed of 1000 rpm to 100 rpm for 10 minutes to 30 minutes, and dispersing and mixing to form a raw material mixture;

Drawing step: The raw material mixture is drawn into a forming wire of a prescribed diameter in a filament forming apparatus.
A method of preparing a shaped yarn according to claim 7, wherein:

The resin is ABS resin, PLA resin, PC resin, PMMA resin, PP resin, PA resin, HIPS resin or PBT resin.
A method for preparing a shaped yarn, characterized in that:

Modification step: 1-3 parts of the silane coupling agent and 57-94 parts of the resin are stirred for 10 minutes to 30 minutes at a stirring speed of 1000 rpm to 100 rpm in parts by weight. Dispersing and mixing to form a modified mixture;

Mixing step: adding 5-40 parts of glass microbeads to the modified mixture, stirring at a stirring speed of 1000 rpm to 100 rpm for 10 minutes to 30 minutes, and dispersing and mixing to form a raw material mixture;

Drawing step: The raw material mixture is drawn into a forming wire of a prescribed diameter in a filament forming apparatus.
A method of preparing a shaped yarn according to claim 9, wherein:

The resin is ABS resin, PLA resin, PC resin, PMMA resin, PP resin, PA resin, HIPS resin or PBT resin.