Method for manufacturing molded objects, molded objects, PET bottles, threads, fibers, and molding apparatus

Abstract

The present invention provides a method for manufacturing molded objects that can increase the strength of the molded object and can be easily produced. [Solution] A manufacturing method for manufacturing a molded object using a molding apparatus having a plasticizing section and a molding section, comprising the steps of: plasticizing a material using the plasticizing section; and manufacturing a molded object from the plasticized material using the molding section, wherein the plasticizing section comprises a flat screw that rotates by a drive motor and has a groove-forming surface in which grooves are formed; a barrel having an opposing surface opposite to the groove-forming surface and having a communication hole in the opposing surface that communicates with the grooves; and a heating section for heating the material, wherein the material is a material that is easily decomposed by heat.

Description

Technical Field

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[0001] The present invention relates to a method for manufacturing a shaped object, a shaped object, a plastic bottle, a thread, a fiber, and a shaping device.

Background Art

[0002] There is known a shaping device that plasticizes a material to generate a plasticized material and discharges the generated plasticized material from a nozzle to shape a shaped object.

[0003] For example, Patent Document 1 describes a three-dimensional shaping device including a plasticizing unit having a rotating screw. In Patent Document 1, the screw is an in-line screw having a shaft shape centered on a central axis and provided with a spiral groove portion centered on the central axis on a side surface portion.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In a three-dimensional shaping device as described above, when a material that is easily decomposed by heat is plasticized in a plasticizing unit having an in-line screw, the molecular weight of the plasticized material constituting the shaped object may significantly decrease compared to the molecular weight of the material before plasticization. When the molecular weight of the material constituting the shaped object decreases, it becomes difficult to manufacture the shaped object.

Means for Solving the Problems

[0006] One aspect of the method for manufacturing a shaped object according to the present invention is a manufacturing method for manufacturing a shaped object using a shaping device having a plasticizing unit and a shaping unit, a step of plasticizing a material by the plasticizing unit, The process of manufacturing a molded object from the plasticized material using the molding unit, Includes, The plasticizing portion is, A flat screw that rotates with a drive motor and has a groove-forming surface in which grooves are formed, A barrel having an opposing surface facing the groove-forming surface, and having a communication hole formed in the opposing surface that communicates with the groove, A heating section for heating the aforementioned material, It has, The aforementioned material is easily decomposed by heat.

[0007] One aspect of the molded object according to the present invention is: It is manufactured by the aforementioned method for manufacturing molded objects.

[0008] One aspect of the PET bottle according to the present invention is: It is manufactured by the aforementioned method for manufacturing molded objects.

[0009] One aspect of the PET bottle according to the present invention is: Using a material containing pellets manufactured by the above-mentioned method for manufacturing molded objects, cold parsing It is manufactured by the genuine process or the hot parison process.

[0010] One aspect of the yarn according to the present invention is It is manufactured by the aforementioned method for manufacturing molded objects.

[0011] One aspect of the fiber according to the present invention is The material, including pellets produced by the aforementioned method for manufacturing molded objects, is manufactured by a process comprising at least one of stretching, heat treatment, crimping, and cutting.

[0012] One aspect of the molding apparatus according to the present invention is: A plasticizing section that plasticizes the material, A molding unit that manufactures a molded object from the plasticized material, Equipped with, The plasticizing portion is, A flat screw that rotates by a drive motor and has a groove-forming surface with grooves formed thereon, A barrel having an opposing surface that faces the groove-forming surface, and a communication hole that communicates with the groove is formed in the opposing surface, A heating unit that heats the material, and has The material is a material that is easily decomposed by heat.

Brief Description of the Drawings

[0013] [Figure 1] A cross-sectional view schematically showing the shaping apparatus according to the present embodiment. [Figure 2] A perspective view schematically showing the flat screw of the shaping apparatus according to the present embodiment. [Figure 3] A plan view schematically showing the barrel of the shaping apparatus according to the present embodiment. [Figure 4] A flowchart for explaining the operation of the shaping apparatus according to the present embodiment. [Figure 5] A cross-sectional view schematically showing the shaping apparatus according to the first modification of the present embodiment. [Figure 6] A table showing the results of the first experiment. [Figure 7] A table showing the results of the second experiment.

Modes for Carrying Out the Invention

[0014] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. Note that the embodiments described below do not unduly limit the content of the present invention described in the claims. Also, not all of the configurations described below are essential constituent elements of the present invention.

[0015] 1. Shaping Apparatus 1.1. Overall Configuration First, the molding apparatus according to this embodiment will be described with reference to the drawings. Figure 1 is a schematic cross-sectional view of the molding apparatus 100 according to this embodiment. In Figure 1, the three mutually orthogonal axes are shown as the X-axis, Y-axis, and Z-axis. The X-axis and Y-axis directions are, for example, horizontal directions. The Z-axis direction is, for example, vertical directions.

[0016] As shown in Figure 1, the molding apparatus 100 includes, for example, a material storage unit 10, a plasticizing unit 20, a molding unit 30, and a control unit 40.

[0017] The material storage section 10 stores pelletized or powdered material. The material storage section 10 supplies material to the plasticizing section 20. The material storage section 10 is configured, for example, to include a hopper.

[0018] The material stored in the material storage section 10 is a material that is easily decomposed by heat. Specifically, the material stored in the material storage section 10 is polyethylene terephthalate (PET).

[0019] The materials stored in the material storage unit 10 may be recycled materials. That is, the materials stored in the material storage unit 10 may be materials that have been collected from used products or waste generated from the manufacturing process and processed so that they can be used as materials for new products.

[0020] The material stored in the material storage section 10 may be an undried resin. That is, the material stored in the material storage section 10 may be a resin that has not undergone drying treatment. The moisture absorption rate of the material stored in the material storage section 10 is, for example, 0.3% or more and 10% or less. The moisture absorption rate is measured, for example, by the loss on drying method.

[0021] The material storage section 10 and the plasticizing section 20 are connected by a supply passage 12 located below the material storage section 10. The material introduced into the material storage section 10 is supplied to the plasticizing section 20 via the supply passage 12.

[0022] The plasticizing unit 20 includes, for example, a screw case 22, a drive motor 24, a flat screw 110, a barrel 120, and a heating unit 130. The plasticizing unit 20 plasticizes the solid material supplied from the material storage unit 10, generates a fluid paste-like plasticizing material, and supplies it to the molding unit 30.

[0023] Plasticization is a concept that includes melting, and refers to the process of changing a solid state to a fluid state. Specifically, for materials that undergo a glass transition, plasticization means raising the material's temperature above its glass transition point. For materials that do not undergo a glass transition, plasticization means raising the material's temperature above its melting point.

[0024] The screw case 22 is a housing that contains the flat screw 110. A barrel 120 is provided on the bottom surface of the screw case 22. The flat screw 110 is housed in the space enclosed by the screw case 22 and the barrel 120.

[0025] The drive motor 24 is mounted on the upper surface of the screw case 22. The drive motor 24 is, for example, a servo motor. The shaft 26 of the drive motor 24 is connected to the upper surface 111 of the flat screw 110. The drive motor 24 is controlled by the control unit 40. Although not shown in the figures, the shaft 26 of the drive motor 24 and the upper surface 111 of the flat screw 110 may be connected via a reduction gear.

[0026] The flat screw 110 has a substantially cylindrical shape in which the magnitude in the direction of the rotation axis R is smaller than the magnitude in the direction perpendicular to the rotation axis R. In the illustrated example, the rotation axis R is parallel to the Z axis. The torque generated by the drive motor 24 causes the flat screw 110 to rotate around the rotation axis R.

[0027] The rotational speed of the flat screw 110 is, for example, 10 rpm to 70 rpm, preferably 30 rpm to 60 rpm, and more preferably 40 rpm to 50 rpm. Viewed from the Z-axis direction, the diameter of the flat screw 110 is, for example, 40 mm to 80 mm, preferably 50 mm to 70 mm, and more preferably 55 mm to 65 mm.

[0028] The flat screw 110 has an upper surface 111, a groove-forming surface 112 opposite to the upper surface 111, and a side surface 113 connecting the upper surface 111 and the groove-forming surface 112. A first groove 114 is formed in 12. The side surface 113 is, for example, perpendicular to the groove-forming surface 112. Here, Figure 2 is a schematic perspective view of the flat screw 110. For convenience, Figure 2 shows the state with the vertical positional relationship reversed compared to the state shown in Figure 1.

[0029] As shown in Figure 2, a first groove 114 is formed on the groove-forming surface 112 of the flat screw 110. The first groove 114 has, for example, a central portion 115, a connecting portion 116, and a material introduction portion 117. The central portion 115 faces the communication hole 126 formed in the barrel 120. The central portion 115 communicates with the communication hole 126. The connecting portion 116 connects the central portion 115 and the material introduction portion 117. In the illustrated example, the connecting portion 116 is formed in a spiral shape from the central portion 115 toward the outer circumference of the groove-forming surface 112. The material introduction portion 117 is formed on the outer circumference of the groove-forming surface 112. That is, the material introduction portion 117 is formed on the side surface 113 of the flat screw 110. The material supplied from the material storage section 10 is introduced into the first groove 114 from the material introduction section 117, and is transported through the connecting section 116 and the central section 115 to the communication hole 126 formed in the barrel 120. In the illustrated example, only one first groove 114 is formed.

[0030] The number of first grooves 114 is not particularly limited. Although not shown in the diagram, there may be two or more first grooves 114, or there may be three.

[0031] As shown in Figure 1, the barrel 120 is located below the flat screw 110. The barrel 120 has an opposing surface 122 that faces the groove-forming surface 112 of the flat screw 110. A communication hole 126 that communicates with the first groove 114 is formed in the center of the opposing surface 122. Here, Figure 3 is a schematic plan view of the barrel 120.

[0032] As shown in Figure 3, a second groove 124 and a communication hole 126 are formed on the opposing surface 122 of the barrel 120. Multiple second grooves 124 are formed. In the illustrated example, six second grooves 124 are formed, but the number of second grooves 124 is not particularly limited. Multiple second grooves 124 are formed around the communication hole 126 when viewed from the Z-axis direction. One end of the second groove 124 is connected to the communication hole 126 and extends in a spiral shape from the communication hole 126 toward the outer circumference of the barrel 120. The second groove 124 has the function of guiding the plasticized plasticizing material to the communication hole 126.

[0033] The shape of the second groove 124 is not particularly limited and may be, for example, straight. Also, one end of the second groove 124 does not have to be connected to the communication hole 126. Furthermore, the second groove 124 does not have to be formed on the opposing surface 122. However, considering the efficient guidance of the plasticized material into the communication hole 126, it is preferable that the second groove 124 be formed on the opposing surface 122.

[0034] As shown in Figure 1, the heating unit 130 is provided in the barrel 120. The heating unit 130 is a heater. For example, the heating unit 130 is a rod heater. The heating unit 130 heats the material supplied between the flat screw 110 and the barrel 120. The output of the heating unit 130 is controlled by the control unit 40. The plasticizing unit 20 heats the material while conveying it toward the communication hole 126 by the flat screw 110, the barrel 120, and the heating unit 130, thereby producing plasticized plasticized material. The plasticizing unit 20 then discharges the generated plasticized material from the communication hole 126. Note that the shape of the heating unit 130 may be ring-shaped when viewed from the Z-axis direction.

[0035] The set temperature of the heating section 130 is, for example, 200°C to 400°C, preferably 250°C to 350°C, and more preferably 270°C to 320°C.

[0036] The molding unit 30 manufactures a molded object from the plasticizing material generated in the plasticizing unit 20. The molding unit 30 is located below the plasticizing unit 20. The molding unit 30 includes, for example, a discharge unit 140, a winding unit 150, and a base 160.

[0037] The discharge unit 140 discharges the plasticizing material generated in the plasticizing unit 20 toward the winding unit 150. In the illustrated example, the discharge unit 140 is connected to the barrel 120. The discharge unit 140 is composed of a nozzle. The discharge unit 140 has a nozzle flow path 142 that communicates with the communication hole 126. The nozzle flow path 142 has a nozzle opening 144. The nozzle opening 144 is located at the tip of the nozzle flow path 142. The discharge unit 140 discharges the plasticizing material supplied from the communication hole 126 to the nozzle flow path 142 from the nozzle opening 144.

[0038] The diameter of the nozzle opening 144 is, for example, 0.2 mm or more and 2.0 mm or less, preferably 0.3 mm or more and 1.5 mm or less, and more preferably 0.4 mm or more and 1.0 mm or less.

[0039] The discharge section 140 discharges, for example, a plasticizing material as a thread 2. Since the thread 2 is discharged while being wound up in the winding section 150, the diameter of the thread 2 becomes smaller than the nozzle opening 144. The diameter of the thread 2 is, for example, 0.05 mm or more and 1.0 mm or less, preferably 0.1 mm or more and 0.7 mm or less, and more preferably 0.2 mm or more and 0.4 mm or less.

[0040] The winding unit 150 is located below the discharge unit 140. The winding unit 150 winds up the yarn 2 discharged from the discharge unit 140. The winding unit 150 includes, for example, a bobbin 152, a rotating shaft member 154, and a drive unit 156.

[0041] The bobbin 152 is cylindrical in shape. The bobbin 152 is located below the discharge unit 140. The bobbin 152 is inserted into the rotating shaft member 154. In the illustrated example, the rotating shaft member 154 extends in the X-axis direction. The rotating shaft member 154 is connected to the drive unit 156. The drive unit 156 rotates the rotating shaft member 154. In the illustrated example, the drive unit 156 rotates the rotating shaft member 154 around an axis parallel to the X-axis. The rotation of the rotating shaft member 154 rotates the bobbin 152, and the yarn 2 discharged from the discharge unit 140 is wound onto the bobbin 152. The drive unit 156 is configured, for example, to include a motor. The drive unit 156 is controlled by the control unit 40.

[0042] The base 160 is located below the plasticizing section 20. The base 160 supports the plasticizing section 20 and the winding section 150. The base 160 includes, for example, a table 162, a stage 164, and a spacer 166.

[0043] The table 162 supports the stage 164 and the winding unit 150. The table 162 has, for example, legs 162a, a shelf 162b, and a top plate 162c. The shelf 162b is located below the top plate 162c. The drive unit 156 is located on the shelf 162b.

[0044] The stage 164 is mounted on the top plate 162c. Through holes 165 are formed in the stage 164 and the top plate 162c. Viewed from the Z-axis direction, the through holes 165 overlap with the bobbin 152. The thread 2 discharged from the discharge section 140 passes through the through holes 165 and is wound onto the winding section 150.

[0045] Spacer 166 is provided on stage 164. Spacer 166 supports the plasticizing portion 20. In the illustrated example, spacer 166 supports barrel 120. The spacer 166 and the stage 164 may be provided integrally. Also, the stage 164 and the table 162 may be provided integrally.

[0046] The control unit 40 is composed of, for example, a computer having a processor, main memory, and an input / output interface for inputting and outputting signals to and from the outside. The control unit 40 performs various functions, for example, by having the processor execute a program loaded into the main memory. The control unit 40 controls the plasticizing unit 20 and the molding unit 30. Specifically, the control unit 40 controls the drive motor 24, the heating unit 130, and the drive unit 156. Note that the control unit 40 may be composed of a combination of multiple circuits instead of a computer.

[0047] 1.2. Operation Figure 4 is a flowchart illustrating the operation of the molding apparatus 100. Specifically, Figure 4 is a flowchart illustrating the processing of the control unit 40 of the molding apparatus 100.

[0048] The user, for example, operates an operating unit (not shown) to output a processing start signal to the control unit 40 to initiate processing. The operating unit consists of, for example, a mouse, keyboard, or touch panel. When the control unit 40 receives the processing start signal, it starts processing.

[0049] First, as shown in Figure 4, the control unit 40 performs a process in step S1 to control the plasticizing unit 20 to plasticize the material to generate plasticizable material, and then discharge the generated plasticizable material from the discharge unit 140. Specifically, the control unit 40 drives the drive motor 24 to rotate the flat screw 110 and also drives the heating unit 130 to plasticize the material supplied between the flat screw 110 and the barrel 120 to generate plasticizable material, and then discharges the generated plasticizable material as yarn 2 from the discharge unit 140.

[0050] Next, in step S2, the control unit 40 controls the winding unit 150 to wind the yarn 2 discharged from the discharge unit 140 into the winding unit 150. Specifically, the control unit 40 drives the drive unit 156 to rotate the rotating shaft member 154 and wind the yarn 2 onto the bobbin 152. Through the processes of steps S1 and S2, the molding unit 30 can manufacture yarn 2 from the plasticizing material.

[0051] Then, after a predetermined time has elapsed since the start of the process of winding the yarn 2, the control unit 40 stops the driving of the plasticizing unit 20 and the winding unit 150, thereby ending the process. Note that the stopping of the driving of the plasticizing unit 20 and the stopping of the driving of the winding unit 150 may or may not occur simultaneously.

[0052] As described above, the yarn 2 can be manufactured as a molded object by the method of manufacturing a molded object using the molding device 100.

[0053] 1.3. Effects The molding apparatus 100 includes a plasticizing unit 20 for plasticizing the material and a molding unit 30 for manufacturing a molded object from the plasticized material. The plasticizing unit 20 includes a flat screw 110 that is rotated by a drive motor 24 and has a groove-forming surface 112 on which a first groove 114 is formed, a barrel 120 that has an opposing surface 122 facing the groove-forming surface 112 and has a communication hole 126 that communicates with the first groove 114 formed in the opposing surface 122, and a heating unit 130 for heating the material. The material is a material that is easily decomposed by heat.

[0054] Therefore, in the molding apparatus 100, as shown in the "Examples and Comparative Examples" described later, compared to the case where a material that is easily decomposed by heat is plasticized in a plasticizing section having an inline screw, This makes it possible to reduce the difference between the molecular weight of the material before plasticization and the molecular weight of the material that makes up the molded object after plasticization. As a result, the strength of the molded object can be increased, and the molded object can be manufactured more easily.

[0055] In the molding device 100, the material used is recycled material. Therefore, the molding device 100 can manufacture environmentally friendly molded objects.

[0056] In the 3D printing device 100, the material used is PET. Therefore, the 3D printing device 100 can manufacture objects without using special materials.

[0057] In the molding apparatus 100, the material is undried resin. Therefore, the molding apparatus 100 can manufacture molded objects without drying the material.

[0058] In the molding apparatus 100, the molding unit 30 has an extrusion unit 140 and a winding unit 150. Plasticized material is extruded from the extrusion unit 140 as yarn 2, and the yarn 2 is wound up by the winding unit 150. Therefore, yarn 2 can be easily manufactured in the molding apparatus 100.

[0059] 2. Modified examples of the molding device 2.1. First Variation Next, a molding apparatus according to the first modified example of this embodiment will be described with reference to the drawings. Figure 5 is a schematic cross-sectional view showing a molding apparatus 200 according to the first modified example of this embodiment. Hereinafter, in the molding apparatus 200 according to the first modified example of this embodiment, components having the same function as the components of the molding apparatus 100 according to the embodiment described above will be denoted by the same reference numerals, and their detailed descriptions will be omitted.

[0060] As shown in Figure 1, the molding apparatus 100 described above had a winding section 150 and a base 160.

[0061] In contrast, the molding apparatus 200 has a stage 210 and a position changing unit 220, as shown in Figure 5. The molding apparatus 200 does not have a winding unit 150 and a base 160.

[0062] The molding apparatus 200 extrudes plasticized plasticizing material from the extrusion unit 140 toward the stage 210 while simultaneously driving the position change unit 220 to change the relative position between the extrusion unit 140 and the stage 210. This allows the molding apparatus 200 to manufacture an object of a desired shape on the stage 210.

[0063] The stage 210 is located below the discharge section 140. In the illustrated example, the stage 210 is shaped like a rectangular parallelepiped. The stage 210 has a deposition surface 212 on which the plasticizing material is deposited. The deposition surface 212 is the upper surface area of ​​the stage 210. The material of the stage 210 is, for example, a metal such as aluminum.

[0064] The position-changing unit 220 supports the stage 210. The position-changing unit 220 changes the relative position between the discharge unit 140 and the stage 210. In the illustrated example, the position-changing unit 220 changes the relative position between the discharge unit 140 and the stage 210 in the X-axis and Y-axis directions by moving the stage 210 in the X-axis and Y-axis directions. Furthermore, the position-changing unit 220 changes the relative position between the discharge unit 140 and the stage 210 in the Z-axis direction by moving the discharge unit 140 in the Z-axis direction.

[0065] The position change unit 220 includes, for example, a first electric actuator 222 and a second electric actuator The system includes an actuator 224 and a third electric actuator 226. The first electric actuator 222 moves the stage 210 in the X-axis direction. The second electric actuator 224 moves the stage 210 in the Y-axis direction. The third electric actuator 226 moves the discharge section 140 in the Z-axis direction.

[0066] The configuration of the position changing unit 220 is not particularly limited, as long as it can change the relative position between the discharge unit 140 and the stage 210. For example, the position changing unit 220 may be configured to move the stage 210 in the Z-axis direction and the discharge unit 140 in the X-axis and Y-axis directions. Alternatively, the position changing unit 220 may be configured to move the stage 210 or the discharge unit 140 in the X-axis, Y-axis, and Z-axis directions.

[0067] The control unit 40 controls the electric actuators 222, 224, and 226 based on the acquired molding data. The molding data includes, for example, information regarding the movement path of the ejection unit 140 relative to the stage 210. The molding data is created, for example, by loading shape data into slicer software installed on a computer connected to the molding apparatus 200.

[0068] The molded object produced by the manufacturing method using the molding apparatus 200 is not particularly limited, but for example, it may be a PET bottle. The shape and size of the PET bottle produced are not particularly limited.

[0069] Alternatively, pellets may be manufactured by a method for manufacturing molded objects using the molding device 200. Then, PET bottles may be manufactured using the material containing the manufactured pellets by the cold parison method or the hot parison method. In this case, the position change unit 220 does not need to be driven. The position change unit 220 does not need to be provided.

[0070] Alternatively, the material containing the manufactured pellets may be used to produce fibers by performing a process including at least one of stretching, heat treatment, crimping, and cutting. The methods for stretching, heat treatment, crimping, and cutting are not particularly limited. The length of the fibers produced is less than the length of the yarn 2 produced by the molding apparatus 100 described above. The diameter of the fibers produced is, for example, less than the length of the yarn 2 produced by the molding apparatus 100 described above.

[0071] The "material containing manufactured pellets" may consist solely of pellets manufactured by the method for manufacturing molded objects using the molding device 200, or it may be a composite of pellets manufactured by the method for manufacturing molded objects using the molding device 200 and other materials such as virgin pellets.

[0072] 2.2. Second Variation Next, a molding apparatus according to a second modified example of this embodiment will be described. Hereinafter, the differences between the molding apparatus according to the second modified example of this embodiment and the example of the molding apparatus 100 according to this embodiment described above will be explained, while similar points will be omitted from the explanation.

[0073] In the aforementioned molding apparatus 100, the material stored in the material storage section 10 was PET.

[0074] In contrast, in the molding apparatus according to the second modified example of this embodiment, the material stored in the material storage section 10 is a material other than PET.

[0075] In the molding apparatus according to the second modification of this embodiment, the material stored in the material storage section 10 may be a thermoplastic resin other than PET. Examples of thermoplastic resins include general-purpose plastics, general-purpose engineering plastics, and super engineering plastics. It can be done.

[0076] Examples of general-purpose plastics include polypropylene (PP), polyethylene (PE), polyvinyl chloride (PVC), and polylactic acid (PLA).

[0077] Examples of general-purpose engineering plastics include polyacetal (POM), polyamide (PA), polycarbonate (PC), modified polyphenylene ether (m-PPE), and polybutylene terephthalate (PBT).

[0078] Examples of super engineering plastics include polysulfone (PSU), polyethersulfone (PES), polyphenylene sulfide (PPS), polyarylate (PAR), polyimide (PI), polyamideimide (PAI), polyetherimide (PEI), and polyetheretherketone (PEEK).

[0079] Alternatively, the material stored in the material storage section 10 is not limited to thermoplastic materials, but may also be, for example, a protein or a biocompatible material.

[0080] 3. Examples and Comparative Examples 3.1. Experimental Conditions 3.1.1. Experiment 1 In the first experiment, PET with a moisture absorption rate of 0.3% or higher, immersed in water, was used as the sample. The PET was plasticized using a 3D printer. The molecular weight of the PET was measured before and after plasticization. The PET used was "Bellpet" (TK3) manufactured by Bell Polyester Products Co., Ltd. Plasticization of the PET was performed using a 3D printer with a flat screw and a 3D printer with an inline screw.

[0081] The molecular weight of PET was measured by gel permeation chromatography (GPC) analysis. The measurement device used was the "GPC-1-4" (using an RI detector) manufactured by Shoko Scientific Co., Ltd.

[0082] Specifically, the PET sample was immersed in an eluent containing hexafluoroisopropanol (HFIP) and 10 mmol / L sodium trifluoroacetate, and polymethyl methacrylate (PMMA) was added as a standard substance. The concentration of PET in the eluent was set to 0.2 w / v%.

[0083] 10 μL of the eluent containing the above-mentioned PET and PMMA was injected into the column at a flow rate of 0.3 mL / min. The column used was a "Shodex GPC LF-404×2" manufactured by Showa Denko Corporation. The column temperature was set to 40°C.

[0084] 3.1.2. Experiment 2 In the second experiment, crushed "I LOHAS" from Coca-Cola Japan Co., Ltd. was used as the PET sample, and the PET was plasticized in the same manner as in the first experiment.

[0085] 3.2. Experimental Results Figure 6 is a table showing the results of the first experiment. Figure 7 is a table showing the results of the second experiment. In Figures 6 and 7, "plasticizing temperature" refers to the set temperature of the heating section of the molding apparatus. "Nozzle diameter" refers to the diameter of the nozzle opening. "Screw diameter" refers to the diameter of the flat screw or inline screw. "Extrusion volume" refers to the amount of plasticizing material extruded from the extrusion section. "Rotation speed" refers to the rotation speed of the flat screw or inline screw.

[0086] As shown in Figure 6, in the first experiment, Example 1 was plasticized using a flat screw. Comparative Examples 1 and 2 were plasticized using an inline screw. In the first experiment, the rotation speed of the inline screw was varied to two levels.

[0087] As shown in Figure 7, in the second experiment, Examples 2 and 3 were plasticized using a flat screw. Comparative Examples 3 and 4 were plasticized using an inline screw. In the second experiment, the rotation speed of the flat screw was varied to two levels, and the rotation speed of the inline screw was also varied to two levels.

[0088] As shown in Figures 6 and 7, when plasticization was performed using a flat screw, the difference between the weight-average molecular weight of PET before plasticization and the weight-average molecular weight of PET after plasticization was smaller compared to when plasticization was performed using an in-line screw. Furthermore, when plasticization was performed using a flat screw, the difference between the number-average molecular weight of PET before plasticization and the number-average molecular weight of PET after plasticization was smaller compared to when plasticization was performed using an in-line screw.

[0089] As shown in Figure 7, comparing Example 2 and Example 3, a higher screw rotation speed resulted in a smaller difference between the weight-average molecular weight of PET before plasticization and the weight-average molecular weight of PET after plasticization. The same was true for the number-average molecular weight.

[0090] Based on the above, it was found that when a material that is easily decomposed by heat is plasticized using a flat screw, the difference between the molecular weight of the material before plasticization and the molecular weight of the material after plasticization can be reduced compared to when it is plasticized using an inline screw.

[0091] The embodiments and variations described above are examples only and are not limited thereto. For example, each embodiment and each variation can be combined as appropriate.

[0092] The present invention includes configurations substantially identical to those described in the embodiments, for example, configurations with the same function, method, and results, or configurations with the same purpose and effect. Furthermore, the present invention includes configurations in which non-essential parts of the configurations described in the embodiments are replaced. Furthermore, the present invention includes configurations that produce the same effects or achieve the same purpose as those described in the embodiments. Finally, the present invention includes configurations that add known technology to the configurations described in the embodiments.

[0093] The following can be derived from the embodiments and modifications described above.

[0094] One method of manufacturing a molded object is: A manufacturing method for producing a molded object using a molding apparatus having a plasticizing section and a molding section, The plasticizing section performs the process of plasticizing the material, The process of manufacturing a molded object from the plasticized material using the molding unit, Includes, The plasticizing portion is, A flat screw that rotates with a drive motor and has a groove-forming surface in which grooves are formed, A barrel having an opposing surface facing the groove-forming surface, and having a communication hole formed in the opposing surface that communicates with the groove, A heating section for heating the aforementioned material, It has, The aforementioned material is easily decomposed by heat.

[0095] This method of manufacturing molded objects allows for increased strength of the objects and facilitates their easy production.

[0096] One embodiment of the method for manufacturing the aforementioned molded object, The aforementioned material may be recycled material.

[0097] This manufacturing method for molded objects allows for the production of environmentally friendly molded objects.

[0098] One embodiment of the method for manufacturing the aforementioned molded object, The aforementioned material may be polyethylene terephthalate.

[0099] This method of manufacturing molded objects allows for the production of molded objects without the use of special materials.

[0100] One embodiment of the method for manufacturing the aforementioned molded object, The aforementioned material may be an undried resin.

[0101] According to this method of manufacturing molded objects, it is possible to produce molded objects without drying the materials.

[0102] One embodiment of the method for manufacturing the aforementioned molded object, The molding unit has a dispensing unit and a winding unit. The process of manufacturing a molded object from the aforementioned material is as follows: A step of extruding the plasticized material as a thread from the extrusion unit, The process of winding the aforementioned thread in the winding section, It may include.

[0103] This method of manufacturing molded objects allows for the easy production of thread.

[0104] One form of a sculpted object is, It is manufactured by the aforementioned method for manufacturing molded objects.

[0105] According to this design, it is very strong and easy to manufacture.

[0106] One form of a plastic bottle is, It is manufactured by the aforementioned method for manufacturing molded objects.

[0107] According to this PET bottle, it is very strong and easy to manufacture.

[0108] One form of a plastic bottle is, The material, including pellets produced by the aforementioned method for manufacturing molded objects, is manufactured by the cold parison method or the hot parison method.

[0109] According to this PET bottle, it is very strong and easy to manufacture.

[0110] One aspect of a thread is, It is manufactured by the aforementioned method for manufacturing molded objects.

[0111] This yarn is highly strong and easy to manufacture.

[0112] One aspect of a fiber is, Using a material containing pellets manufactured by the above-mentioned method for manufacturing molded objects, stretching, heat treatment, It is manufactured by a process that includes at least one of crimping and cutting.

[0113] This fiber is highly strong and easy to manufacture.

[0114] One embodiment of a molding apparatus is: A plasticizing section that plasticizes the material, A molding unit that manufactures a molded object from the plasticized material, Equipped with, The plasticizing portion is, A flat screw that rotates with a drive motor and has a groove-forming surface in which grooves are formed, A barrel having an opposing surface facing the groove-forming surface, and having a communication hole formed in the opposing surface that communicates with the groove, A heating section for heating the aforementioned material, It has, The aforementioned material is easily decomposed by heat.

[0115] This 3D printing device allows for increased strength of printed objects and facilitates the easy manufacture of such objects. [Explanation of Symbols]

[0116] 2...Thread, 10...Material storage section, 20...Plasticizing section, 22...Screw case, 24...Drive motor, 26...Shaft, 30...Forming section, 40...Control section, 100...Forming device, 110...Flat screw, 111...Top surface, 112...Groove forming surface, 113...Side surface, 114...First groove, 115...Center section, 116...Connection section, 117...Material introduction section, 120...Barrel, 122...Opposite surface, 124...Second groove, 126...Communication hole, 130...Heating section, 140...Discharge section, 142...Nozzle Flow channel, 144... Nozzle opening, 150... Winding section, 152... Bobbin, 154... Rotating shaft member, 156... Drive unit, 160... Base, 162... Table, 162a... Legs, 162b... Shelf, 162c... Top plate, 164... Stage, 165... Through hole, 166... ​​Spacer, 200... Molding device, 210... Stage, 212... Deposition surface, 220... Position change section, 222... First electric actuator, 224... Second electric actuator, 226... Third electric actuator

Claims

1. A manufacturing method for producing a molded object using a molding apparatus having a plasticizing section and a molding section, The plasticizing section performs the process of plasticizing the material, The process of manufacturing a molded object from the plasticized material using the molding unit, Includes, The plasticizing portion is, A flat screw that rotates with a drive motor and has a groove-forming surface in which grooves are formed, A barrel having an opposing surface facing the groove-forming surface, and having a communication hole formed in the opposing surface that communicates with the groove, A heating section for heating the aforementioned material, It has, The aforementioned material is a material that is easily decomposed by heat, and the method for manufacturing a molded object.

2. In claim 1, The aforementioned material is a recycled material, and the method is a method for manufacturing molded objects.

3. In claim 1, A method for manufacturing a molded object, wherein the material is polyethylene terephthalate.

4. In claim 1, The aforementioned material is an undried resin, and the method is a method for manufacturing a molded object.

5. In claim 1, The molding unit has a dispensing unit and a winding unit. The process of manufacturing a molded object from the aforementioned material is as follows: A step of extruding the plasticized material as a thread from the extrusion unit, The process of winding the aforementioned thread in the winding section, A method for manufacturing molded objects, including

6. A molded object manufactured by the method for manufacturing a molded object described in claim 1.

7. A PET bottle manufactured by the method for manufacturing a molded object as described in claim 3.

8. A PET bottle manufactured by a cold parison method or a hot parison method using a material containing pellets manufactured by the method for manufacturing a molded object described in claim 3.

9. A thread produced by the method for manufacturing a molded object as described in claim 5.

10. Fibers produced by a process comprising at least one of stretching, heat treatment, crimping, and cutting, using a material including pellets produced by the method for manufacturing a molded object described in claim 5.

11. A plasticizing section that plasticizes the material, A molding unit that manufactures a molded object from the plasticized material, Equipped with, The plasticizing portion is, A flat screw that rotates with a drive motor and has a groove-forming surface in which grooves are formed, The groove-forming surface has an opposing surface, and the opposing surface has a communication hole that communicates with the groove. The barrel was modified, A heating section for heating the aforementioned material, It has, The aforementioned material is a material that is easily decomposed by heat, and the material is a molding device.

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