Injection molding device

Abstract

The present invention is provided with a first injection part (22), a second injection part (24), a mold mounting part (28), and a hot runner (26), and is capable of selecting a posture in which a first plasticizing device (32) is in fluid communication with a first plunger (34) and a posture in which the first plunger (34) is in fluid communication with the hot runner (26) as a posture of a first distributor (60), and a posture in which a second plasticizing device (32) is in fluid communication with the hot runner (26) as a posture of a second distributor (64). A posture in which the second plasticizing device (38) is in fluid communication with the second plunger (40) and a posture in which the second plunger (40) is in fluid communication with the hot runner (26) can be selected, the hot runner (26) is provided with a first runner (44), a second runner (46) and a nozzle (42), and the nozzle (42) can be in fluid communication with the mold M while being in fluid communication with the two runners.

Description

Technical Field

[0001] The invention relates to an injection molding device. Background Art

[0002] From the perspective of reducing environmental load, the demand for the reuse of recycled plastic containers is further increasing. Patent document 1 discloses a preform manufacturing device that can manufacture preforms from thermoplastic resin sheets and includes: a decontaminator that removes contaminants from thermoplastic resin sheets generated from used plastic containers; and an injection molding machine that performs injection molding on the thermoplastic resin supplied from the decontaminator.

[0003] Since recycled materials are derived from used materials, the various conditions (such as usage, shape, and processing conditions) involved in the source of the used materials are different, so it is believed that there will be differences in quality compared to pure materials produced under equal manufacturing conditions. Therefore, in order to use recycled materials to manufacture plastic containers, measures are needed to absorb the quality differences on the raw material side by adjusting the manufacturing conditions.

[0004] As an example of such measures, there is research on using recycled materials and pure materials together to manufacture plastic containers and ensure a predetermined quality. For example, Patent Document 1 discloses an apparatus for manufacturing preforms using pure materials alone, recycled materials alone, or a mixture of pure materials and recycled materials as materials.

[0005] Patent Literature Patent Document 1: Japanese Patent Application Publication No. 2019-514728 (or U.S. Patent Application Publication No. 2019 / 126512) Summary of the invention

[0006] In order to use a mixture of pure material and recycled material in the apparatus of Patent Document 1, it is necessary to premix the pure material and recycled material and then supply the mixture to the apparatus. Therefore, it is difficult to change the ratio of pure material to recycled material during the production of preforms, and there is a possibility that the quality unevenness of recycled material cannot be completely absorbed.

[0007] Therefore, the present invention seeks to realize an injection molding device that can easily adjust supply conditions such as supply order and supply ratio when supplying a plurality of materials to a mold.

[0008] The first injection molding device of the present invention comprises: a first injection molding part having a first plasticizing device, a first plunger, and a first distributor connected to the first plasticizing device and the first plunger; a second injection molding part having a second plasticizing device, a second plunger, and a second distributor connected to the second plasticizing device and the second plunger; a mold mounting part; and a hot runner connected to the first injection molding part and the second injection molding part, characterized in that the first distributor can select the first plasticizing device as the posture of the first distributor. The second distributor can select a posture in which the second plasticizing device is in fluid communication with the first plunger and a posture in which the first plunger is in fluid communication with the hot runner. The posture in which the second plasticizing device is in fluid communication with the second plunger and a posture in which the second plunger is in fluid communication with the hot runner can be selected as the posture of the second distributor. The hot runner has a first runner, a second runner and a nozzle. The nozzle is configured to be in fluid communication with the first runner and the second runner and to be in fluid communication with a mold mounted on the mold mounting portion.

[0009] The second injection molding device involved in the present invention comprises: an injection section having a first plasticizing device, a second plasticizing device, a plunger and a distributor; a mold mounting section; and a hot runner connected to the injection section fluid, characterized in that, as the posture of the distributor, a posture in which the first plasticizing device is connected to the plunger fluid, a posture in which the second plasticizing device is connected to the plunger fluid, and a posture in which the plunger is connected to the hot runner fluid can be selected, and the hot runner has a first runner, a second runner and a nozzle, and the nozzle is configured to be connected to the mold fluid mounted on the mold mounting section while being connected to the first runner and the second runner fluids.

[0010] According to these configurations, when supplying the first material supplied by the first plasticizing device and the second material supplied by the second plasticizing device to the mold, supply conditions such as supply order and supply ratio can be adjusted. Thus, the quality of the obtained molded body is easily stabilized.

[0011] Hereinafter, preferred embodiments of the present invention will be described, but the scope of the present invention is not limited to the preferred embodiment examples described below.

[0012] The injection molding device involved in the present invention, as a form, preferably has the first distributor connected to the second distributor, and as the posture of the first distributor and the second distributor, it is possible to select a posture in which the first plunger is fluidically connected to at least one of the second plasticizing device and the second plunger.

[0013] According to this configuration, since the first material supplied by the first plasticizing device and the second material supplied by the second plasticizing device can be mixed in the first plunger, it is easy to adjust the physical properties of the materials.

[0014] The injection molding device according to the present invention, in one aspect, preferably further includes a control device capable of controlling the operations of the first plunger and the second plunger.

[0015] According to this configuration, it is easy to control the ratio of the first material and the second material supplied to the mold.

[0016] The injection molding device involved in the present invention, as a form, preferably also includes: a first flow meter, which is arranged on the runner between the first distributor and the hot runner; and a second flow meter, which is arranged on the runner between the second distributor and the hot runner, and the control device can control the movement of the first plunger and the second plunger based on the indication value of the first flow meter and the indication value of the second flow meter.

[0017] According to this configuration, control reflecting the operating state of the injection molding device can be easily performed.

[0018] The injection molding device involved in the present invention, as a form, preferably also includes: a first displacement meter capable of detecting the displacement of the piston of the first plunger; and a second displacement meter capable of detecting the displacement of the piston of the second plunger, and the control device can control the movement of the first plunger and the second plunger based on the indication value of the first displacement meter and the indication value of the second displacement meter.

[0019] According to this configuration, control reflecting the operating state of the injection molding device can be easily performed.

[0020] In one aspect of the injection molding device according to the present invention, it is preferred that the hot runner has a stem capable of opening and closing the nozzle and an adjustment device capable of adjusting the position of the stem.

[0021] According to this configuration, it is easy to control the order, timing, ratio, etc. of supplying the first material and the second material to the mold.

[0022] In one aspect of the injection molding device according to the present invention, it is preferable that the adjustment device includes a servo motor and is configured to adjust the position of the shaft based on the rotation speed of the servo motor.

[0023] According to this configuration, it is easy to finely adjust the order, timing, ratio, etc. of supplying the first material and the second material to the mold.

[0024] In one aspect of the injection molding device according to the present invention, it is preferred that the adjustment device includes a magnetic displacement meter and a hydraulic device capable of moving the shaft, and the hydraulic device is controlled based on an indication value of the magnetic displacement meter.

[0025] According to this configuration, it is easy to finely adjust the order, timing, ratio, etc. of supplying the first material and the second material to the mold.

[0026] The injection molding device involved in the present invention, as a form, preferably also has a third distributor arranged between the first injection molding part and the second injection molding part and the hot runner, and the posture of the third distributor can be selected: the posture in which the first injection molding part is connected to the first runner fluid, and the second injection molding part is connected to the second runner fluid; and the posture in which the first injection molding part is connected to the second runner fluid, and the second injection molding part is connected to the first runner fluid.

[0027] According to this configuration, the material supplied to the first runner and the second runner can be arbitrarily selected.

[0028] The injection molding device according to the present invention, in one embodiment, preferably further includes a static mixer provided on the flow path between the first plunger and the hot runner.

[0029] According to this configuration, it is easy to make the material supplied from the first plunger to the hot runner in a uniform state.

[0030] The injection molding device according to the present invention, in one aspect, preferably further includes a third plasticizing device, and as the posture of the first distributor, a posture in which the third plasticizing device is in fluid communication with the first plunger can be selected.

[0031] According to this configuration, since the first material supplied by the first plasticizing device and the third material supplied by the third plasticizing device can be mixed in the first plunger, it is easy to adjust the physical properties of the materials.

[0032] The injection molding device according to the present invention, in one embodiment, preferably includes a material supply unit capable of supplying a molten resin to the first plasticizing device.

[0033] According to this configuration, the material that has been pre-processed in a molten state can be supplied to the first plasticizing device.

[0034] In one embodiment of the injection molding device of the present invention, the raw material supply unit preferably includes an extruder capable of melting and extruding a recycled material and a decontamination machine capable of removing foreign matter contained in the recycled material. The raw material supply unit preferably includes an extruder capable of melting and extruding a recycled material and a decontamination machine capable of removing foreign matter contained in the recycled material.

[0035] According to this configuration, a recycled material that has been subjected to a decontamination treatment can be used as the first material supplied by the first plasticizing device.

[0036] In one aspect of the injection molding device according to the present invention, it is preferable that a sheet-shaped recycled material be used as the recycled material.

[0037] According to this configuration, the step of pelletizing the recycled material can be omitted.

[0038] Further features and advantages of the present invention will become more apparent from the following description of illustrative and non-limiting embodiments described with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 Indicates a preform for a plastic container. Figure 2 A schematic diagram showing a pre-processing unit according to the first embodiment. Figure 3 A schematic diagram showing an injection molding device according to a first embodiment. Figure 4 (a) is a perspective view of the first distributor, (b) is a cross-sectional view along line bb of (a), (c) is a cross-sectional view along line cc of (a), and (d) is a cross-sectional view along line dd of (a). Figure 5 This is a perspective view showing the third distributor. Figure 6 (a) is an exploded perspective view of a hot runner, and (b) is a schematic diagram illustrating the relationship between a shaft and a control plate. Figure 7 (a) is a perspective view of a static mixer, and (b) is a cross-sectional view taken along the bb plane of (a). Figure 8 (a) shows the first injection of resin from the first preform according to the present embodiment, (b) shows the next injection of resin, (c) shows the first preform after molding, and (d) shows a plastic bottle manufactured from the first preform. Fig. 9 (a) shows the first injection of resin involving the second preform, (b) shows the next injection of resin, (c) shows the second preform after molding, and (d) shows a plastic bottle manufactured from the second preform. Fig.10 (a) represents the initial resin injection involving the 3rd and 4th preforms, (b) represents the next resin injection, (c) represents the 3rd preform after molding, (d) represents a plastic bottle manufactured from the 3rd preform, (e) represents the 4th preform after molding, and (f) represents a plastic bottle manufactured from the 4th preform. Fig.11(a) shows a modification example of the third preform, (b) shows a plastic bottle manufactured from the modification example of the third preform, (c) shows a modification example of the fourth preform, and (d) shows a plastic bottle manufactured from the modification example of the fourth preform. Fig.12 (a) shows the first injection of resin related to the fifth preform, (b) shows the next injection of resin, (c) shows the fifth preform after molding, and (d) shows a plastic bottle manufactured from the fifth preform. Fig.13 (a) is a stereoscopic view of the third distributor involved in the modified example, (b) is a cross-sectional view along the bb line of (a), (c) is a cross-sectional view along the cc line of (a), (d) is a cross-sectional view along the dd line of (a), and (e) is a cross-sectional view along the ee line of (a). Fig.14 (a) is an exploded perspective view of a hot runner according to a modified example, and (b) is a schematic diagram illustrating the relationship between the shaft, the control plate, and the oil plate. Fig.15 A schematic diagram showing an injection molding device according to another embodiment. Fig.16 A schematic diagram showing an injection molding device according to still another embodiment. DETAILED DESCRIPTION

[0040] The embodiment of the injection molding device according to the present invention will be described with reference to the accompanying drawings. Figure 1 ) is described with reference to an example of a manufacturing system 10 (an example of an injection molding device) in which a preform 100 is supplied to the manufacturing of a plastic bottle. In addition, the same symbols are marked on the same or corresponding elements, and repeated descriptions are omitted. In addition, for ease of understanding, the scale of the figure is sometimes changed for description.

[0041] (Manufacturing system configuration) Figure 1 1 shows a preform 100 for a plastic container. Here, the plastic container is a plastic bottle mainly used for containing beverages, food, etc., and is made of polyethylene terephthalate (PET). In addition, the plastic container is not limited to this, and can also be made of plastics such as polypropylene (PP) and polyethylene (PE). In addition, the plastic container can also be polyethylene naphthalate (PEN), especially a plant bottle made of plants (plant).

[0042] The preform 100 is composed of a mouth 100a that fits into the lid of the plastic container, a cylindrical main body 100b that is formed continuously with the mouth 100a, and a bottom 100c that closes one end of the cylindrical main body, and has a test tube-like shape. One end of the mouth 100a is open, and an external thread that is screwed into the internal thread formed on the lid of the plastic container is formed on its outer peripheral surface. The plastic container is formed by expanding the test tube-shaped preform 100 by stretch blow molding.

[0043] exist Figure 2 and Figure 3 , a schematic diagram of a manufacturing system 10 is shown. The manufacturing system 10 has Figure 2 The pre-processing unit 12 for pre-processing the recycled material RC as the first molten material and the Figure 3 The molding machine 14 shown. Usually, the preform 100 is manufactured using a composite material such as a pure material VM as a second molten material made of petroleum or the like, a recycled material RC made of a used plastic container as a raw material, or a mixture of the pure material VM and the recycled material RC as a raw material, and using the molding machine 14. In addition, since the used plastic container may be contaminated with impurities, the recycled material RC is put into the molding machine 14 after the impurities are removed in advance in the pre-treatment unit 12. In addition, in the following description, although the composite material is described as the pure material VM and the recycled material RC, it is not limited to this. For example, a composite material of a petroleum-derived plastic material and a bioplastic material may be used to manufacture a plastic container.

[0044] In addition, a recycled material such as bioplastics or chemical recycled plastics that are easy to obtain a relatively stable quality material may be used instead of the pure material VM. Since the pure material VM or the material replacing it is supplied to the second plasticizing device 38 via the hopper 36 as described later, it is preferably a material in a form suitable for supplying from the hopper 36, such as granules or powders. For the chemical recycled plastics and the like exemplified above, commercial products in granules and powders may be used, or they may be granulated or powdered by a known method.

[0045] The pre-processing unit 12 as an example of a raw material supply unit includes a dryer 16, an extruder 18, and a decontamination machine 20. The recycled material RC refers to a thermoplastic resin sheet as an example of a sheet-like reuse material, for example, a PET sheet obtained by washing and crushing a used PET bottle (the washing machine and the crushing machine are not shown). Here, the PET sheet is a small piece of about 8 mm square. The recycled material RC is put into the storage tank of the dryer 16, and after being dried in the dryer 16, it is supplied to the extruder 18.

[0046] The recycled material RC dried in the dryer 16 is transported to the extruder 18 and heated while being stirred. As a result, the recycled material RC is melted and plasticized. In addition to the recycled material RC, the pure material VM may be supplied to the extruder 18. At this time, the supply position of the pure material VM may be either the dryer 16 or the extruder 18.

[0047] The recycled material RC plasticized in the extruder 18 is transported to the decontamination machine 20. The decontamination machine 20 has a decontamination container connected to a vacuum pump. By heating the recycled material RC put into the decontamination container under vacuum, the contaminants in the recycled material RC, that is, the thermoplastic resin, can be volatilized. In this way, the contaminants in the recycled material RC can be removed. In addition, the vacuum pump and the decontamination container are omitted in the figure.

[0048] The decontaminated recycled material RC is supplied to the forming machine 14. Figure 3 As shown, the molding machine 14 includes a first injection unit 22 and a second injection unit 24, a hot runner 26, a mold mounting unit 28, and a control device 30. In addition, a mold M is mounted on the mold mounting unit 28. In addition, the mold M is provided with a plurality of cavities corresponding to the shapes of the preforms 100, and a plurality of preforms 100 can be manufactured by a single injection molding.

[0049] The first injection molding part 22 includes a first plasticizing device 32, a first plunger 34, and a first distributor 60. The first plasticizing device 32 includes a screw (not shown) extending in the longitudinal direction inside its frame 32a, and is heated by a heater. The thermoplastic resin of the recycled material RC supplied from the decontamination machine 20 is supplied to the first plasticizing device 32 in a molten state, and can be maintained in a plasticized state by stirring in a heated state.

[0050] The top end of the first plasticizing device 32 is connected to the first plunger 34 through the first distributor 60. The first plunger 34 has a first piston 34a on the inside thereof which is configured to be able to slide along the length direction of the first plunger 34. By sliding the first piston 34a in the direction of being pulled out from the first plunger 34, the recycled material RC in the first plasticizing device 32 can be sucked into the inside of the first plunger 34. In addition, by sliding the first piston 34a in the direction of being pressed into the inside of the first plunger 34, the recycled material RC sucked into the inside of the first plunger 34 can be pressurized toward the hot runner 26, i.e., extruded. The first plunger 34 is connected to the control device 30, and is configured so that the amount of recycled material RC extruded from the first plunger 34 can be controlled by controlling the sliding, i.e., the movement amount, of the first plunger 34.

[0051] The first distributor 60 is connected to the hot runner 26 via a third distributor 62 described later. Therefore, the regenerated material RC squeezed out by the first plunger 34 is configured to flow into the hot runner 26 via the third distributor 62 .

[0052] The molding machine 14 is provided with a second injection unit 24 for supplying the pure material VM to the mold M set on the mold mounting unit 28, and the second injection unit 24 includes a hopper 36 for injecting the granular pure material VM, a second plasticizing device 38, a second plunger 40, and a second distributor 64. The second plasticizing device 38 has a screw (not shown) extending in the longitudinal direction inside its frame 38a, and is heated by a heater. The thermoplastic resin of the pure material VM supplied from the hopper 36 in the form of granules is plasticized by stirring in the second plasticizing device 38 in a heated state.

[0053] The top end of the second plasticizing device 38 is connected to the second plunger 40 through the second distributor 64 described later. The second plunger 40 has a second piston 40a on the inside thereof which is configured to be slidable along the length direction of the second plunger 40. By sliding the second piston 40a in the direction of being pulled out from the second plunger 40, the pure material VM in the second plasticizing device 38 can be sucked into the inside of the second plunger 40. By sliding the second piston 40a in the direction of being pressed into the inside of the second plunger 40, the pure material VM sucked into the inside of the second plunger 40 can be pressurized toward the hot runner 26, i.e., extruded. The second plunger 40 is connected to the control device 30, and is configured so that the amount of pure material VM extruded from the second plunger 40 can be controlled by controlling the sliding, i.e., the movement amount, of the second plunger 40.

[0054] The second distributor 64 is connected to the hot runner 26 via the third distributor 62 described later. Therefore, the vitriol VM squeezed out by the second plunger 40 is configured to flow into the hot runner 26 via the third distributor 62 .

[0055] The first distributor 60 and the second distributor 64 are connected to each other through the pipe 65, thereby enabling the first plunger 34 to be fluidically connected to the second plunger 40. Therefore, the pure material VM in the second plunger 40 can flow to the first plunger 34 via the second distributor 64, the pipe 65, and the first distributor 60, and the recycled material RC supplied from the first plasticizing device 32 can be mixed with the pure material VM supplied from the second plasticizing device 38 via the second plunger 40. In addition, conversely, the recycled material RC can also be supplied to the second plunger 40.

[0056] like Figure 4As shown in FIG. 1 , the first distributor 60 has a shape in which the first flow channel 60b, the second flow channel 60c and the third flow channel 60d for circulating the recycled material RC and the pure material VM are separated in the axial direction and formed inside the cylindrical main body 60a. By sliding the main body 60a in the axial direction and changing the posture of any one of the first flow channel 60b, the second flow channel 60c and the third flow channel 60d to align with two or three of the first plasticizing device 32, the first plunger 34, the second distributor 64 and the third distributor 62, a fluid communication state corresponding to the target can be achieved. In addition, since the shape and function of the second distributor 64 are the same as those of the first distributor 60, the description thereof is omitted.

[0057] The first flow channel 60b has openings on three sides of the cross section of the main body 60a, each of which is 90° apart. By making these openings face the first plasticizing device 32, the first plunger 34 and the second distributor 64, the three can be fluidically connected. At this time, when the posture of the first distributor 60 and the second plunger 40 being fluidically connected is selected as the posture of the second distributor 64, the first plasticizing device 32, the first plunger 34 and the second plunger 40 are fluidically connected. In this state, the recycled material RC supplied from the first plasticizing device 32 and the pure material VM supplied from the second plasticizing device 38 via the second plunger 40 can be guided to the first plunger 34.

[0058] The second flow channel 60c has openings on two sides 180° apart on the cross section of the main body 60a, and these openings are directed toward the first plunger 34 and the hot runner 26, respectively, so that the two can be fluidically connected. However, in this embodiment, since the third distributor 62 is provided between the first distributor 60 and the hot runner 26, the first distributor 60 and the third distributor 62 can be fluidically connected. In this state, the material can be injected from the first plunger 34 to the hot runner 26.

[0059] The third flow channel 60d has openings on two sides separated by 90 degrees on the cross section of the main body 60a, and these openings are respectively directed toward the first plasticizing device 32 and the first plunger 34, so that the two can be fluidically connected. In this state, the recycled material RC supplied from the first plasticizing device 32 can be guided to the first plunger 34.

[0060] exist Figure 5 , a perspective view of the third distributor 62 is shown. The third distributor 62 is formed in a cylindrical shape and is connected to the first distributor 60 and the second distributor 64 through piping (see Figure 3). The third distributor 62 is arranged so that its axial direction is orthogonal to the axial direction of the pipe connecting the third distributor 62 and the first distributor 60 and the second distributor 64, that is, the direction in which the regenerated material RC and the pure material VM flow in the pipe. In addition, the third distributor 62 is configured to be able to slide along its axial direction by a driving mechanism not shown.

[0061] The third distributor 62 has through holes 62a, 62b, 62c, and 62d formed in a manner of penetrating toward the opposite side in the radial direction. Specifically, it has a pair of through holes 62a and 62b formed in a radial direction on one side of the axial direction, and a pair of through holes 62c and 62d formed in a cross-shaped manner when viewed from the side on the other side. Here, the pair of through holes 62c and 62d are formed so as not to be connected to each other inside. Therefore, the molten materials passing through the through holes 62c and 62d are not mixed inside.

[0062] The third distributor 62 can switch the through holes 62a, 62b, 62c, and 62d connected to the first distributor 60 and the second distributor 64 by sliding in the axial direction. Specifically, when the third distributor 62 is connected to the piping on one side, the through hole 62a is connected to the first distributor 60, and the through hole 62b is connected to the second distributor 64. In addition, when the third distributor 62 is slid and connected on the other side, the through hole 62d is connected to the first distributor 60, and the through hole 62c is connected to the second distributor 64. In this way, by sliding the third distributor 62, the piping connecting the first distributor 60 and the second distributor 64, that is, the first injection part 22 and the second injection part 24, and the hot runner 26 can be switched. Furthermore, by sliding the third distributor 62 to a position where the through holes 62 a , 62 b , 62 c , and 62 d are not connected to the pipes, the recycled material RC and the pure material VM flowing from the first injection section 22 and the second injection section 24 can be cut off.

[0063] The control device 30 controls the movement of the first plunger 34 and the second plunger 40, for example, based on the flow rate of the material extruded from each plunger or the displacement of the piston of each plunger. In the former example, the movement of each of the first plunger 34 and the second plunger 40 is controlled based on the indication value of the first flow meter (not shown) provided on the flow path between the first distributor 60 and the hot runner 26 and the second flow meter (not shown) provided on the flow path between the second distributor 64 and the hot runner 26. Thus, for example, the ratio of the materials respectively ejected from the first plunger 34 and the second plunger 40 to the mold M or the mixing ratio when two materials are mixed in the first plunger 34 can be controlled. In addition, in the latter example, the flow rate of the material is determined based on the displacement of the piston of each plunger, and the same control as the former example can be implemented.

[0064] like Figure 3As shown, a plurality of nozzles 42 are provided in the hot runner 26 for injecting the plasticized recycled material RC and the pure material VM toward the mold M provided on the mold mounting portion 28. In addition, a first runner 44 and a second runner 46 are formed inside the hot runner 26 as separate independent flow channels for flowing the thermoplastic resin.

[0065] When the first distributor 60 and the second distributor 64 are connected to the through holes 62a and 62b on one side of the third distributor 62, the recycled material RC and / or the pure material VM squeezed out from the first plunger 34 flows in the first runner 44. In addition, the recycled material RC and / or the pure material VM squeezed out from the second plunger 40 flows in the second runner 46.

[0066] On the contrary, when the first distributor 60 and the second distributor 64 are connected to the through holes 62c and 62d on the other side of the third distributor 62, the recycled material RC and / or the pure material VM squeezed out from the second plunger 40 flows in the first runner 44. In addition, the recycled material RC and / or the pure material VM squeezed out from the first plunger 34 flows in the second runner 46.

[0067] like Figure 6 As shown in (a), the hot runner 26 is formed by overlapping a packing plate 26a and a manifold plate 26c, and a first runner 44 and a second runner 46 are arranged inside the hot runner 26 (both refer to Figure 3 ). In addition, a control plate 26b is sandwiched between the pad 26a and the diverter plate 26c.

[0068] A cylindrical static mixer 56 is disposed inside the pipe connecting the third distributor 62 and the hot runner 26, that is, connecting the third distributor 62 and the first runner 44 and the second runner 46. The pipe in which the static mixer 56 is disposed is connected to the first runner 44 and the second runner 46 via a sprue bush 26d. Figure 7As shown, on the outer and inner surfaces of the static mixer 56 formed in a cylindrical shape, a plurality of protrusions 56a are formed along the axial direction of the static mixer 56. The protrusions 56a are formed along the circumferential direction of the static mixer 56, respectively, and are formed so that the lengths of the protrusions 56a adjacent to each other along the axial direction of the static mixer 56 are different. Here, three protrusions 56a with different circumferential lengths are repeatedly formed along the axial direction. The regenerated material RC and the pure material VM flowing through the pipe are disturbed by the protrusions 56a of the static mixer 56. Therefore, when the regenerated material RC and the pure material VM are mixed and flow through the pipe, they are disturbed, thereby promoting the mixing of each other. Thus, the regenerated material RC and the pure material VM can be mixed, and the material of the injection molding material during injection molding can be made homogeneous. In addition, the shape of the protrusion 56a shown in this embodiment is an example, and is not limited to this. As long as it is formed to a degree that can disturb the composite material, protrusions of different shapes can also be formed.

[0069] like Figure 6 As shown in (b), a servo motor 58 (an example of an adjustment device) for operating or sliding a shaft 50 described later is disposed inside the control board 26b. The servo motor 58 is electrically connected to the control device 30.

[0070] like Figure 3 and Figure 8 As shown in (a), the nozzle 42 is formed in a bell shape whose outer circumference is reduced toward the mold M, and an injection port 48 for injecting a material, i.e., a resin, is formed at the top end portion opposite to the mold M. In addition, a first injection path 52 is formed along the axial direction of the nozzle 42 at the center portion, and its end is connected to the injection port 48. In addition, a second injection path 54 is formed along the axial direction of the nozzle 42 and along the outer circumference of the first injection path 52 on the radially outer side, and its end is connected to the injection port 48. The first injection path 52 is connected to the first runner 44, and the second injection path 54 is connected to the second runner 46.

[0071] Inside the first injection path 52, a metal shaft 50 formed in a rod shape is arranged along the axial direction of the nozzle 42. The shaft 50 is configured to be movable by a servo motor 58 (see Figure 6 (b)) slides along the axial direction of the nozzle 42. Therefore, the control device 30 can control the sliding of the shaft 50, that is, the movement amount, by controlling the servo motor 58, that is, the operation thereof. Thus, the first injection path 52 can be blocked or opened, and the amount of the recycled material RC and / or the pure material VM ejected from the first injection path 52 can be adjusted. In addition, it is not necessary to set the same number of servo motors 58 as the shaft 50, and several shafts 50 can be connected to one servo motor 58, and these shafts 50 can be moved simultaneously by the servo motor 58.

[0072] (How to use the manufacturing system) Next, an injection molding method for molding the fifth preform 105 from the first preform 101 using the recycled material RC and the virgin material VM as the composite material using the manufacturing system 10 according to the present embodiment will be described.

[0073] (First Preform 101) Here, by adjusting, i.e. sliding, the third distributor 62, the first plunger 34 is connected to the first runner 44, and the second plunger 40 is connected to the second runner 46. Figure 8 As shown in (a), by sliding the shaft 50 toward the injection port 48, the first injection path 52 can be closed. In this state, the second plunger 40 is used to pressurize the clean material VM, and the mold M (see Figure 3 ) is injected. The injected pure material VM first contacts the inner part of the mold M, and the contacted part is cooled and solidified. Therefore, the continuously injected pure material VM flows along the inner side of the mold M starting from the part.

[0074] Next, if Figure 8 As shown in (b), the first injection path 52 can be opened by sliding the shaft 50 toward the hot runner 26 side, that is, toward the side away from the injection port 48. In this state, when the second plunger 40 stops pressurizing and the recycled material RC is pressurized by the first plunger 34, only the recycled material RC is injected from the first injection path 52 into the mold M. Therefore, Figure 8 As shown in (c), the first preform 101 can be formed with the pure material VM arranged inside and on the bottom. Figure 8 As shown in FIG. 5 , by expanding the first preform 101 by stretch blow molding, a plastic container PB can be formed in which the virgin material VM is arranged inside and on the bottom. Thus, a plastic container PB using both the recycled material RC and the virgin material VM can be manufactured in a manner that ensures high quality, that is, in a manner that suppresses or prevents the influence on the contents such as beverages poured into the container and ensures the strength of the container.

[0075] (Second Preform 102) like Figure 3 As shown, the first plunger 34 is connected to the second plunger 40 via the first distributor 60 and the second distributor 64. Therefore, the pure material VM on the second plunger 40 side can flow to the first plunger 34 side, and can be mixed with the recycled material RC of the first plunger 34 to produce a mixed material MX.

[0076] Here, by adjusting, i.e. sliding, the third distributor 62, the first plunger 34 is connected to the first runner 44, and the second plunger 40 is connected to the second runner 46. Fig. 9 As shown in (a), by sliding the shaft 50 toward the injection port 48, the first injection path 52 can be closed. In this state, the clean material VM produced on the second plunger 40 side is pressurized and can be injected from the second injection path 54 into the mold M (see Figure 3 ) is injected. The injected pure material VM first contacts the inner part of the mold M, and the contacted part is cooled and solidified. Therefore, the continuously injected pure material VM flows along the inner side of the mold M starting from the part.

[0077] Next, if Fig. 9 As shown in (b), by sliding the shaft 50 toward the hot runner 26, the first injection path 52 is opened. In this state, when the second plunger 40 stops pressurizing and the first plunger 34 pressurizes the mixed material MX, only the mixed material MX can be injected from the first injection path 52 to the mold M. Fig. 9 As shown in (c), a second preform 102 can be formed in which a pure material VM is arranged inside and on the bottom. Fig. 9 As shown in FIG. 5 , by expanding the second preform 102 thus constructed by stretch blow molding, a plastic container PB can be formed in which the virgin material VM is arranged inside and on the bottom. Thus, a plastic container PB using both the recycled material RC and the virgin material VM can be manufactured in a manner that ensures high quality, that is, in a manner that suppresses or prevents the influence on the contents such as beverages poured into the container and ensures the strength of the container.

[0078] (Third Preform 103 and Fourth Preform 104) Here, by sliding the third distributor 62, the first plunger 34 is connected to the second runner 46, and the second plunger 40 is connected to the first runner 44. Fig.10 As shown in (a), by sliding the shaft 50 toward the injection port 48, the first injection path 52 can be closed. In this state, the recycled material RC on the first plunger 34 side is pressurized, and the recycled material RC can be injected from the second injection path 54 into the mold M (see Figure 3 ) is injected in large quantities. The recycled material RC injected in large quantities does not solidify even when it contacts the inner part of the mold M, but flows into the depth of the mold M.

[0079] Next, if Fig.10As shown in (b), the first injection path 52 is opened by sliding the shaft 50 toward the hot runner 26. In this state, when the first plunger 34 stops pressurizing and the second plunger 40 pressurizes the pure material VM, only the pure material VM can be injected from the first injection path 52 to the mold M. Fig.10 As shown in (c), since the recycled material RC rushes to the depth of the mold M, the third preform 103 can be formed with the pure material VM arranged at the bottom and the recycled material RC arranged at the top. In addition, by producing the mixed material MX on the side of the first plunger 34 and injecting it into the mold M, the fourth preform 104 can be formed with the pure material VM arranged at the bottom and the mixed material MX arranged at the top. Fig.10 As shown in (d) and (f), the third preform 103 and the fourth preform 104 are expanded by stretch blow molding to form a plastic container PB with virgin material VM arranged at the bottom. Thus, a plastic container PB using both recycled material RC and virgin material VM can be manufactured in a manner that ensures high quality.

[0080] also, Fig.11 (a) shows a modified example 103A of the third preform 103. In the modified example 103A, the recycled material RC is arranged on the upper part, and a double-layer structure of the recycled material RC (inside) and the pure material VM (outside) is formed on the bottom. In the plastic container PB ( Fig.11 (b)), the recycled material RC is arranged on the inner side of the bottom, and the pure material VM is arranged on the outer side of the bottom. From the viewpoint of improving the strength of the bottom, in addition to using the pure material VM for the entire bottom like the third preform 103, a configuration in which the bottom is partially made of the pure material VM as in the modified example 103A may be adopted. In addition, for the modified example 104A ( Fig.11 (c)) and the plastic container PB obtained therefrom ( Fig.11 (d)) is also the same.

[0081] (Fifth preform 105) exist Fig.12 , an injection molding method using a single nozzle 90 as a nozzle of a single injection path is shown. The single nozzle 90 has only a first injection path 92 formed thereon, and the first injection path 92 is connected to the first runner 44 and / or the second runner 46, and can inject the mixed material MX produced on the first plunger 34 and / or the second plunger 40 side.

[0082] Therefore, if Fig.12As shown in (a) to (c), the fifth preform 105 can be formed by using a mixed material MX in which the pure material VM is adjusted according to the purpose of use. Fig.12 As shown in (d), the fifth preform 105 is expanded by stretch blow molding to form a plastic container PB containing the mixed material MX. Thus, a plastic container PB containing both the recycled material RC and the pure material VM can be manufactured in a high-quality manner.

[0083] (Effects of this embodiment) Next, the operation and effects of the manufacturing system 10 according to the first embodiment will be described below.

[0084] The manufacturing system 10 according to the present embodiment is provided with: a first plasticizing device 32 for melting the recycled material RC; a second plasticizing device 38 for melting the pure material VM; and a first plunger 34 and a second plunger 40 for pressurizing the recycled material RC and the pure material VM melted in the plasticizing device. In addition, the hot runner 26 is provided, which has: a first runner 44 connected to the first plunger 34 and the second plunger 40 through a pipe, forming a flow path for the recycled material RC and the pure material VM pressurized by the first plunger 34 and the second plunger 40 to pass through; and a nozzle 42 connected to the mold M provided on the mold mounting portion 28, so that the recycled material RC and the pure material VM flowing in from the first runner 44 are ejected into the mold M. Therefore, the recycled material RC and the pure material VM, which have different heating times and heating temperatures required for melting due to different physical properties, can be melted separately. As a result, a high-quality plastic container PB can be manufactured while ensuring the quality of the recycled material RC and the pure material VM.

[0085] Furthermore, according to the manufacturing system 10 involved in this embodiment, the first distributor 60 and the second distributor 64 are provided to pass or cut off the recycled material RC and / or the pure material VM flowing from the first plasticizing device 32 and the second plasticizing device 38. Therefore, the amount of the molten material extruded by the first plunger 34 and the second plunger 40 can be adjusted according to the part of the plastic container PB to be injection molded. Thus, the molten material can be used differently according to the part of the plastic container PB, and a high-quality plastic container PB can be manufactured.

[0086] Furthermore, according to the manufacturing system 10 of the present embodiment, recycled material RC can be used as at least one of the composite materials. Therefore, high-quality plastic containers PB can be manufactured by combining recycled material RC with other materials having different physical properties.

[0087] Furthermore, according to the manufacturing system 10 involved in the present embodiment, the third distributor 62 is disposed between the first distributor 60 and the first runner 44, and is connected to the second plasticizing device 38 and the second plunger 40 through piping, so as to allow or cut off the regenerated material RC and the pure material VM. Therefore, the amount of the regenerated material RC and the pure material VM flowing from the first distributor 60 to the first runner 44 and the amount of the regenerated material RC and the pure material VM flowing from the second plunger 40 to the first runner 44 can be adjusted. Furthermore, the third distributor 62 is connected to the second runner 46 of the hot runner 26 through piping. Therefore, the amount of the regenerated material RC and the pure material VM flowing from the first distributor 60 to the second runner 46 and the amount of the regenerated material RC and the pure material VM flowing from the second plunger 40 to the second runner 46 can be adjusted. Thus, since different molten materials can be injected through the first runner 44 and the second runner 46, the molten materials can be used differently according to the parts of the plastic container PB, so that high-quality plastic containers PB can be manufactured.

[0088] Furthermore, according to the manufacturing system 10 according to the present embodiment, the cylindrical static mixer 56 having the protrusion 56a formed on the outer side is provided in the pipes respectively disposed between the first runner 44 and the second runner 46 and the third distributor 62. Therefore, the recycled material RC and the pure material VM flowing to the first runner 44 and the second runner 46 via the third distributor 62 can be stirred by the protrusion 56a on the outer side of the static mixer 56. Therefore, the mixed material MX can flow to the first runner 44 and the second runner 46 in a homogeneous state. Thus, a high-quality plastic container PB can be manufactured.

[0089] Furthermore, according to the manufacturing system 10 involved in this embodiment, the second distributor 64 is connected to the second plasticizing device 38 and the second plunger 40 through piping, and allows the clean material VM to pass or cut off toward the first distributor 60 or the third distributor 62. Therefore, the amount of the molten material extruded by the second plunger 40 can be adjusted according to the part of the plastic container PB to be injection molded. Thus, the molten material can be used differently according to the part of the plastic container PB, and high-quality plastic containers PB can be manufactured.

[0090] Furthermore, according to the manufacturing system 10 of the present embodiment, the hot runner 26 includes: the shaft 50 for opening and closing the nozzle 42; the servo motor 58 for operating the nozzle 42; and the control board 26b for disposing the servo motor 58. Therefore, by operating the shaft 50 to open and close the nozzle 42, the amount of the recycled material RC and the virgin material VM injected through the first runner 44 and the second runner 46 can be adjusted. Thus, since the recycled material RC and the virgin material VM can be used differently according to the part of the plastic container PB, a high-quality plastic container PB can be manufactured.

[0091] Furthermore, according to the manufacturing system 10 of the present embodiment, the manufacturing system 10 includes the molding machine 14 and the decontamination machine 20 for decontaminating the recycled material RC. Therefore, it is possible to manufacture a high-quality plastic container PB by decontaminating the recycled material RC to which contaminants adhere.

[0092] As described above, according to the manufacturing system 10 of the present embodiment, it is possible to manufacture the plastic container PB from the composite material of the recycled material RC and the virgin material VM while ensuring high quality.

[0093] In addition, although the case where the first plunger 34 and the second plunger 40 are used as plungers is described here, the present invention is not limited to this, and the plungers may be concentrated into one, or three or more plungers may be used.

[0094] (Variation of the third distributor) like Fig.13 As shown in FIG. 1 , the third distributor 63 according to the present modification has a first flow channel 63b, a second flow channel 63c, a third flow channel 63d, and a fourth flow channel 63e formed along the radial direction inside a main body 63a formed in a cylindrical shape for circulating the recycled material RC and the pure material VM. In addition, the third distributor 63 is slidable along its axial direction. The first flow channel 63b and the second flow channel 63c are formed in straight lines that are orthogonal to each other when viewed along the axial direction of the main body 63a. Therefore, the recycled material RC and / or the pure material VM can flow to one of the first runner 44 and the second runner 46, and can flow to the other of the first runner 44 and the second runner 46 by rotating the main body 63a 90 degrees around the axis. The third flow channel 63d and the fourth flow channel 63e are curved flow channels that do not pass through the axial center of the main body 63a in order to allow only one of the recycled material RC or the pure material VM from the first plunger 34 or the second plunger 40 to flow toward the first runner 44 or the second runner 46.

[0095] The third distributor 63 can adjust the amount of the recycled material RC and the pure material VM flowing from the first distributor 60 to the first runner 44 and the amount of the recycled material RC and the pure material VM flowing from the second plunger 40 to the first runner 44. In addition, the third distributor 63 can adjust the amount of the recycled material RC and the pure material VM flowing from the first distributor 60 to the second runner 46 and the amount of the recycled material RC and the pure material VM flowing from the second plunger 40 to the second runner 46. Thus, since different molten materials can be injected through different first runners 44 and second runners 46, the molten materials can be used differently according to the parts of the plastic container PB, so that high-quality plastic containers PB can be manufactured.

[0096] (Modification of the shaft adjustment device) In the above-described embodiment, an example in which the servo motor 58 is provided as an adjustment device for operating the shaft 50 is described. Hereinafter, a modified example of such an adjustment device will be described.

[0097] like Fig.14 As shown in (a), the hot runner 26 involved in this modification is constructed such that the control plate 26b and the oil plate 26e are sandwiched between the pad 26a and the manifold 26c. Fig.14 As shown in (b), a magnetic displacement meter 94 for detecting the displacement of the shaft 50 is arranged on the control plate 26b, and the oil plate 26e is configured so that the drive mechanism 96 can be operated by oil pressure in order to slide the shaft 50. In addition, the magnetic displacement meter 94 and the drive mechanism 96 are configured to be linked by the control device 30.

[0098] The hot runner 26 includes a magnetic displacement meter 94 for detecting the displacement of the shaft 50, and an oil plate 26e (an example of a hydraulic device) connected to the magnetic displacement meter 94 to operate the drive mechanism 96 by hydraulic pressure. Therefore, the opening and closing of the nozzle 42 can be adjusted while confirming the displacement of the shaft 50 detected by the magnetic displacement meter 94, and as a result, the amount of the recycled material RC and the pure material VM injected through the first runner 44 and the second runner 46 can be adjusted. As a result, since the injected molten material can be used differently according to the part of the plastic container PB, a high-quality plastic container PB can be manufactured.

[0099] (Another embodiment) exist Fig.15 In another embodiment shown, a third injection molding unit 70 is added to the manufacturing system 10 involved in the above-mentioned embodiment. The third injection molding unit 70 has a hopper 76 for injecting a granular mixed material MX and a third plasticizing device 78. The third plasticizing device 78 has a screw (not shown) extending along the length direction inside its frame 78a and is heated by a heater. The top end of the third plasticizing device 78 is connected to the first plasticizing device 32 through a pipe, and the mixed material MX can be supplied to the first plasticizing device 32. As a result, the recycled material RC supplied from the decontamination machine 20 can be mixed with the mixed material MX supplied from the third plasticizing device 78 on the first plasticizing device 32.

[0100] Fig.16 Another embodiment shown has Fig.15Another embodiment omits the construction of the second injection section 24. In this way, the injection molding device involved in the present invention can also be implemented by having an injection section (first injection section 22) having a first plasticizing device (first plasticizing device 32), a second plasticizing device (third plasticizing device 78), a plunger (first plunger 34) and a distributor (first distributor 60). At this moment, as the posture of the first plunger 34, it is sufficient to select a posture in which the first plasticizing device is connected to the plunger fluid, a posture in which the second plasticizing device is connected to the plunger fluid, and a posture in which the plunger is connected to the hot runner fluid. Thus, the two materials can be mixed in the plunger in any proportion.

[0101] Regarding other configurations, it should be understood that the embodiments disclosed in this specification are illustrative in all aspects, and the scope of the present invention is not limited thereto. It should be easily understood by those skilled in the art that appropriate changes can be made without departing from the scope of the gist of the present invention. Therefore, other embodiments that are changed within the scope of the gist of the present invention are certainly also included in the scope of the present invention. Industrial Applicability

[0102] The present invention can be used, for example, in the production of preforms. Explanation of symbols

[0103] 10- Manufacturing system; 12- Pre-processing unit; 14-forming machine; 16-Raw material pre-processing department; 18- Extruder; 20-Decontamination machine; 22-1st injection molding department; 24- 2nd injection molding department; 26-hot runner; 26a- pad; 26b-control panel; 26c-dividing plate; 26d-sprue bushing; 26e-Oil plate; 28- mold installation part; 30-control device; 32-1st plasticizing device; 32a-frame; 34-1st plunger; 34a-1st piston; 36- hopper; 38- second plasticizing device; 38a-frame; 40- 2nd plunger; 40a- second piston; 42-nozzle; 44-1st pouring channel; 46- 2nd pouring channel; 48-shooting port; 50- shaft; 52-1st injection path; 54- second injection path; 56-static mixer; 56a-protrusion; 58-Servo motor; 60-1st distributor; 60a-Ontology part; 60b-1st flow channel; 60c- 2nd flow channel; 60d- 3rd flow channel; 62- 3rd distributor; 62a-through hole; 62b-through hole; 62c-through hole; 62d-through hole; 63- 3rd distributor; 63a-Ontology part; 63b-1st flow channel; 63c- 2nd flow channel; 63d- 3rd flow channel; 63e-4th flow channel; 64- 2nd distributor; 65-Piping; 70-3rd injection molding department; 76-hopper; 78-3rd plasticizing device; 78a-frame; 90-single nozzle; 92-1st injection path; 94-Magnetic displacement meter; 96- driving mechanism; M-mold; 100-preform; 100a - mouth; 100b- cylindrical main body; 100c- bottom; 101- the first preform; 102- the second preform; 103- the third preform; 104- the fourth preform; 105-5th preform; MX-hybrid materials; RC - recycled materials; VM - pure material; PB - Plastic container.

Claims

1. An injection molding device comprising: A first injection molding part, comprising a first plasticizing device, a first plunger, and a first distributor connected to the first plasticizing device and the first plunger; A second injection molding part, comprising a second plasticizing device, a second plunger, and a second distributor connected to the second plasticizing device and the second plunger; Mould installation department; and a hot runner, which is in fluid communication with the first injection molding part and the second injection molding part, It is characterized in that As the posture of the first distributor, it is possible to select a posture in which the first plasticizing device is in fluid communication with the first plunger and a posture in which the first plunger is in fluid communication with the hot runner. As the posture of the second distributor, it is possible to select a posture in which the second plasticizing device is in fluid communication with the second plunger and a posture in which the second plunger is in fluid communication with the hot runner. The hot runner comprises a first runner, a second runner and a nozzle. The nozzle is provided so as to be able to communicate with the first runner and the second runner in fluid communication with each other and to communicate with the mold mounted on the mold mounting portion in fluid communication with each other.

2. The injection molding device according to claim 1, characterized in that: The first distributor is connected to the second distributor, As the postures of the first distributor and the second distributor, a posture in which the first plunger is in fluid communication with at least one of the second plasticizing device and the second plunger can be selected.

3. The injection molding device according to claim 1, characterized in that: The invention further includes a control device capable of controlling the operations of the first plunger and the second plunger.

4. The injection molding device according to claim 3, characterized in that: Also available: A first flow meter is arranged on the flow channel between the first distributor and the hot runner; and a second flow meter, which is arranged on the flow channel between the second distributor and the hot runner, The control device can control the operation of the first plunger and the second plunger based on the indication value of the first flow meter and the indication value of the second flow meter.

5. The injection molding device according to claim 3, characterized in that: Also available: a first displacement meter capable of detecting a displacement of a piston of the first plunger; and a second displacement meter capable of detecting the displacement of the piston of the second plunger, The control device can control the operations of the first plunger and the second plunger based on the indication value of the first displacement meter and the indication value of the second displacement meter.

6. The injection molding device according to any one of claims 1 to 5, characterized in that: The hot runner includes a shaft capable of opening and closing the nozzle and an adjusting device capable of adjusting a position of the shaft.

7. The injection molding device according to claim 6, characterized in that: The adjustment device includes a servo motor and is configured to adjust the position of the shaft based on the rotation speed of the servo motor.

8. The injection molding device according to claim 6, characterized in that: The adjustment device includes a magnetic displacement meter and a hydraulic device capable of moving the shaft, and controls the hydraulic device based on an indication value of the magnetic displacement meter.

9. The injection molding device according to claim 1, characterized in that: It also includes a third distributor disposed between the first injection unit, the second injection unit and the hot runner, As the posture of the third dispenser, the following can be selected: The first injection portion is in fluid communication with the first runner, and the second injection portion is in fluid communication with the second runner; and a posture in which the first injection portion is in fluid communication with the second runner, and the second injection portion is in fluid communication with the first runner.

10. The injection molding device according to claim 1, characterized in that: The invention further comprises a static mixer provided on the flow path between the first plunger and the hot runner.

11. The injection molding device according to claim 1, characterized in that: It also has a third plasticizing device. As the posture of the first distributor, a posture in which the third plasticizing device is in fluid communication with the first plunger can also be selected.

12. The injection molding device according to claim 1, characterized in that: A raw material supply section capable of supplying a molten resin to the first plasticizing device is provided.

13. The injection molding device according to claim 12, characterized in that: The raw material supply unit includes an extruder capable of melting and extruding a recycled material and a decontaminator capable of removing foreign matter contained in the recycled material.

14. The injection molding device according to claim 13, characterized in that: As the recycled material, a sheet-shaped recycled material can be used.

15. An injection molding device comprising: An injection molding section having a first plasticizing device, a second plasticizing device, a plunger, and a distributor; Mould installation department; and a hot runner, which is in fluid communication with the injection molding part, It is characterized in that As the posture of the distributor, it is possible to select a posture in which the first plasticizing device is in fluid communication with the plunger, a posture in which the second plasticizing device is in fluid communication with the plunger, and a posture in which the plunger is in fluid communication with the hot runner. The hot runner comprises a first runner, a second runner and a nozzle. The nozzle is provided so as to be able to communicate with the first runner and the second runner in fluid communication with each other and to communicate with the mold mounted on the mold mounting portion in fluid communication with each other.

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