JP2005280025A - Injection molding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an injection molding machine capable of achieving the structural simplification of a mold and sharp cost reduction. <P>SOLUTION: The injection molding machine is equipped with a mold 5 having one or a plurality of cavities 10, a plurality of the nozzle touch parts 11a-11c provided to the mold 5 to communicate with the cavity 10, a plurality of injection plunger units 15a-15c having the nozzles independently joined to a plurality of the nozzle touch parts 11a-11c and injecting a molten resin in the cavity 10 of the mold 5 and a plasticizer for plasticizing a synthetic resin material to supply the plasticized molten resin to a plurality of the injection plunger units 15a-15c. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an injection molding apparatus that molds a molded product by injecting a molten resin into a mold having one or a plurality of cavities.

  For example, an injection molding apparatus that injects a molten resin into a cavity from one sprue having a nozzle touch portion in a mold having a large cavity for molding a large molded product is known. Also, in a mold in which a plurality of cavities are provided in one mold and a plurality of identical molded products or different molded products are molded at the same time, injection that is distributed and injected into each cavity of a molten resin from one sprue having a nozzle touch portion A molding apparatus is known.

  In the former case, there is a problem that the cavity is large and it takes time to spread the molten resin to every corner of the cavity. In the latter case, there is a time difference until the molten resin is injected into each cavity. There is.

  In any case, a hot runner having a plurality of branched resin passages is provided in the mold body to guide the molten resin from the sprue to the cavity in a molten state, and each resin passage is provided with a gate valve. In addition, a plasticizing device that heats and kneads the synthetic resin material to plasticize it and a metering injection device that measures the molten resin supplied from the plasticizing device and injects it into the mold are provided outside the mold. Yes.

  Therefore, there is a problem that the structure of the mold is complicated and expensive, and the repair cost is increased when the hydraulic cylinder for opening and closing the gate valve breaks down. Furthermore, the plasticizing device and the metering injection device provided outside the mold are also increased in size, and the equipment cost is increased, and since there is only one metering device, it is difficult to control the pressure, flow rate, etc. depending on the molding conditions. It is.

  Therefore, a plurality of injection devices are attached to one plasticizing device, plasticizing the synthetic resin material continuously with the plasticizing device, and mold the molten resin sequentially plasticized from the plurality of injection devices. There is known an injection plasticizing apparatus for an injection molding machine in which the cycle time of injection molding is shortened to increase the productivity of a molded product (for example, see Patent Document 1).

  There is also known an injection plasticizing apparatus which has two injection plasticizing apparatuses and injects resin materials alternately plasticized from these injection plasticizing apparatuses to increase the plasticizing ability. (For example, refer to Patent Document 2).

  In addition, a preliminary plasticizing device and an injection device equipped with a plunger dedicated to injection into the mold are provided side by side, and both devices are connected via a switching valve in the nozzle portion, and the molten resin extruded from the preliminary plasticizing device is There is also known a preliminary plasticizing apparatus in which a mold is injected by an injection apparatus (see, for example, Patent Document 3).

Also, the same number of plasticizers and injection devices for injection into the mold are provided, the plasticizer and multiple injection devices are connected, and the molten resin is alternately transferred from the plasticizer to the multiple injection devices. An injection apparatus for an injection molding machine that is guided is also known (for example, see Patent Document 4).
Japanese Patent No. 2786243 Japanese Patent Publication No. 63-59367 Japanese Examined Patent Publication No. 63-57213 Japanese Patent Publication No. 63-4487

  By the way, since patent document 1 can inject molten resin into the cavity of a mold from a plurality of injection devices provided outside the mold, it is not necessary to provide a hot runner or a gate valve in the mold. The structure of the mold is simplified and the cost can be reduced. However, there is only one nozzle touch part provided in the mold, and when the cavity becomes large in order to mold a large molded product, it takes time to spread from one nozzle touch part to every corner of the cavity, In the case of a large molded product, there is a problem that the cycle time of injection molding takes a long time.

  Patent Document 2 is an apparatus in which two injection plasticizing apparatuses are provided side by side to increase the plasticizing capability. Patent Document 3 is an injection apparatus including a preliminary plasticizing apparatus and an injection-dedicated plunger. The injection apparatus has one injection nozzle, and has a structure in which molten resin is injected from one nozzle touch portion provided in the mold, and has the same problem as in Patent Document 1.

  In Patent Document 4, the injection device and the mold are provided in a one-to-one relationship, and there is one injection nozzle of the injection device, and the molten resin is supplied from one nozzle touch portion provided in the mold. This is a structure to be injected, and has the same problem as Patent Document 1.

  The present invention has been made paying attention to the above circumstances, and the object of the present invention is to simplify the structure of the mold, to greatly reduce the cost, and to provide a molten resin in the mold cavity. It is an object of the present invention to provide an injection molding apparatus that can arbitrarily set the injection conditions of a plurality of injection plunger units for injecting the liquid and can perform injection in accordance with the molding conditions.

  In order to achieve the above-mentioned object, the present invention provides a mold having one or a plurality of cavities, a plurality of nozzle touch portions provided in the mold and communicating with the cavities, and the plurality The injection molding apparatus includes a plurality of injection plunger units for injecting molten resin into a cavity of the mold.

  A second aspect of the present invention includes a mold having one or a plurality of cavities, a plurality of nozzle touch portions provided in the mold and communicating with the cavities, and nozzles independently joined to the plurality of nozzle touch portions. And a plurality of injection plunger units for injecting molten resin into the cavity of the mold, and a plasticizer for plasticizing a synthetic resin material and supplying the plasticized molten resin to the plurality of injection plunger units. The present invention provides an injection molding apparatus.

  A third aspect is characterized in that at least one of the plurality of injection plunger units according to the first or second aspect is movable in accordance with a position of a nozzle touch portion of the mold.

  According to a fourth aspect of the present invention, the plurality of injection plunger units according to the first or second aspect are individually provided with valve gates.

  A fifth aspect of the invention is characterized in that the plurality of injection plunger units of the first or second aspect have a function of measuring and injecting molten resin.

  A sixth aspect of the present invention is characterized in that the plasticizing device of the second aspect and the plurality of injection plunger units are connected by a resin supply pipe having flexibility.

  According to the present invention, it is not necessary to provide a hot runner or a gate valve on the mold body, the structure of the mold can be simplified, and the cost can be greatly reduced. Furthermore, since a plurality of injection plunger units for injecting the molten resin into the mold cavity are provided independently, the injection conditions can be arbitrarily set for each injection plunger unit, and injection suitable for the molding conditions can be performed. There is an effect that can be done.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 to 4 show a first embodiment, FIG. 1 is a front view of an injection molding apparatus, FIG. 2 is a side view, FIG. 3 is a plan view, and FIG. 4 is a front view of an injection plunger unit. First, the schematic configuration of the injection molding apparatus will be described. The mold clamping apparatus 1 has a fixed die plate 2, and a plurality of tie bars 3 are fixed to the fixed die plate 2 in the vertical direction. The movable die plate 4 is supported so as to be movable in the vertical direction. An injection mold 5 is provided between the fixed die plate 2 and the movable die plate 4. The fixed mold 6 of the injection mold 5 is fixed to the fixed die plate 2, and the movable mold 7 is moved to the movable die plate 4. It is fixed to each.

  An opening 8 that opens in a reverse taper shape is provided at a substantially central portion of the fixed die plate 2, and a locating portion 9 that faces the nozzle touch of the injection mold 5 is provided in the opening 8. In the present embodiment, a single cavity 10 for molding one large molded product is provided between the fixed mold 6 and the movable mold 7 of the injection mold 5, and around the cavity 10. Is provided with a cooling water channel (not shown).

  The fixed mold 6 is provided with three nozzle touch portions 11 a to 11 c corresponding to the locate portion 9, and these nozzle touch portions 11 a to 11 c are connected via straight resin passages 12 a to 12 c provided in the fixed mold 6. It communicates with the cavity 10. That is, in FIG. 1, the left resin passage 12 a communicates with the left end portion of the cavity 10, the central resin passage 12 b communicates with the central portion of the cavity 10, and the right resin passage 12 c communicates with the right end portion of the cavity 10. Accordingly, molten resin is injected into one cavity 10 from three locations.

  Three injection plunger units 15a to 15c, which will be described later, are arranged in the vertical direction on the upper part of the mold clamping device 1 in correspondence with the intervals between the nozzle touch portions 11a to 11c provided on the injection mold 5. In addition to the three injection plunger units 15a to 15c, there is provided one plasticizer 16 which will be described later that heats and kneads the synthetic resin material to plasticize it. A molten resin outlet 18 is provided at the tip of the plasticizing cylinder 17 of the plasticizer 16, and a distribution header 19 is provided at the molten resin outlet 18. One end of three flexible resin supply pipes 20 such as a Teflon (registered trademark) hose is connected to the distribution header 19, and the other end is connected to three injection plunger units 15a to 15c. Yes. The plasticizer 16 can supply the molten resin to the three injection plunger units 15a to 15c.

  Next, the plasticizing device 16 will be described. A plasticizing screw 21 is provided inside the horizontal plasticizing cylinder 17. A supply port 23 having a hopper 22 is provided at an upper portion on the proximal end side of the plasticizing cylinder 17. A heater 24 is wound around the plasticizing cylinder 17 to heat and melt the synthetic resin material inside the plasticizing cylinder 17.

  A drive unit 25 is provided on the proximal end side of the plasticizing screw 21, and an inverter motor 26 is provided in the drive unit 25. A rotation shaft 27 of the inverter motor 26 is provided with a pulley 28, and a rotational force is transmitted from the pulley 28 to a pulley 30 fitted to the plasticizing screw 21 via a belt 29. The plasticizing screw 21 is divided into screw elements having different screw shapes so as to function as, for example, a feed unit, a kneading unit, and a compression unit from the base end side in the axial direction toward the front end side. The plasticizing screw 21 rotates while contacting inside the plasticizing cylinder 17 to knead the synthetic resin material while being heated by the heater 24, and the molten resin is led out from the molten resin outlet 18 toward the distribution header 19. It is like that.

  Next, the three injection plunger units 15a to 15c will be described. Since these have the same structure, one of them will be described as shown in FIG. The unit main body 31 includes an upper frame 32, a lower frame 33, and a plurality of guide rods 34 that connect the upper frame 32 and the lower frame 33 with a space in the vertical direction.

  A through hole 35 penetrating in the vertical direction is provided in the upper portion of the upper frame 32, and a nut portion 38 of a ball screw 37 is rotatably supported in the through hole 35 via a bearing 36. A threaded portion 39 is screwed onto the nut portion 38, and the threaded portion 39 is moved in the vertical direction by the rotation of the nut portion 38.

  A servo motor 40 is fixed to a side portion of the upper frame 32, and a pulley 42 is fitted on a rotation shaft 41 of the servo motor 40. Further, a pulley 43 is fixed to the top of the nut portion 38, and a belt 44 is stretched between the pulleys 42 and 43. The nut portion 38 of the ball screw 37 is rotated by driving the servo motor 40, and the rotational motion of the nut portion 38 is converted into a linear motion so that the screw portion 39 moves up and down.

  A connecting member 45 guided in the vertical direction by the guide rod 34 is provided at the lower end portion of the screw portion 39. A base end portion of an injection plunger 47 inserted into the injection cylinder 46 is connected to the connection member 45. The injection cylinder 46 has a base end fixed to the lower frame 33 and an injection nozzle 48 provided at the tip.

  A needle valve 49 for opening and closing the injection nozzle 48 is provided in the injection cylinder 46 so as to be movable up and down. The needle valve 49 is opened and closed by a lever 51 that moves up and down by an air cylinder 50 provided outside the injection cylinder 46.

  Further, a resin introduction block 52 is fixed to the outer side of the injection cylinder 46. The resin introduction block 52 is provided with a resin introduction port 53 communicating with the inside of the injection cylinder 46. The resin introduction port 53 is inclined with respect to the axis of the injection cylinder 46, and its lower end opens below the tip when the injection plunger 47 is positioned at the uppermost position. The upper end portion of the resin introduction port 53 is connected to the resin supply pipe 20 outside the injection cylinder 46, and an opening / closing cock 54 is provided at this connection portion.

  Next, the operation of the first embodiment will be described.

  When the fixed mold 6 of the injection mold 5 and the movable mold 7 are joined and the mold clamping device 1 is clamped, when the inverter motor 26 of the plasticizing device 16 is driven, the rotation of the rotary shaft 27 is a pulley. The rotational force is transmitted in the order of 28, belt 29, and pulley 30, and the plasticizing screw 21 rotates in the plasticizing cylinder 17. On the other hand, the synthetic resin material charged into the hopper 22 is supplied to the plasticizing cylinder 17 from the resin supply port 23, and the synthetic resin material is heated by the heater 24 and kneaded by the plasticizing screw 21 to become a molten resin.

  The molten resin is supplied from the resin outlet port 18 of the plasticizing cylinder 17 to the three resin supply pipes 20 via the distribution header 19, and is supplied to the three injection plunger units 15 a, 15 b, and 15 c through the resin supply pipe 20. The That is, the molten resin is introduced into the injection cylinder 46 through the resin introduction port 53 provided in the injection cylinder 46 of each injection plunger unit 15a, 15b, 15c.

  At this time, since the injection nozzle 48 of the injection cylinder 46 is closed by the needle valve 49, when molten resin is introduced into the injection cylinder 46, the injection plunger 47 is gradually pushed up by the resin pressure. When the amount of the molten resin to be injected into the cavity 10 of the injection mold 5 is measured by each injection plunger unit 15a, 15b, 15c, the open / close cock 54 is closed and the molten resin is introduced into the injection cylinder 46. Stops.

  Next, when each injection plunger unit 15a, 15b, 15c is lowered by a hydraulic cylinder (not shown), the injection nozzle 48 of each injection plunger unit 15a, 15b, 15c becomes the nozzle touch part 11a, 11b, Join to 11c. In this state, when the servo motor 40 of each injection plunger unit 15a, 15b, 15c is driven, the rotation shaft 41 of the servo motor 40 is rotated by the nut portion 38 of the ball screw 37 via the pulley 42, the belt 44 and the pulley 43. Rotate. The rotational motion of the nut portion 38 is converted into a linear motion, the screw portion 39 is lowered, and the injection plunger 47 in the injection cylinder 46 is pushed down via the connecting member 45.

  Accordingly, the molten resin in the injection cylinder 46 is injected from the injection nozzle 48 into the cavity 10 through the resin passages 12a, 12b, and 12c. The molten resin injected into the cavity 10 is cooled and solidified by the cooling water flowing through the cooling water channel surrounding the cavity 10.

  In this case, the servo motor 40 of the injection plunger units 15a, 15b, and 15c may be simultaneously driven to inject molten resin from the injection nozzle 48 into the cavity 10 at the same time, and the servo motor 40 of the injection plunger units 15a, 15b, and 15c may be injected into the servo motor 40. You may inject | pour into the cavity 10 from the injection nozzle 48 with a time difference. Further, the injection speed may be controlled by individually controlling the rotation speeds of the servo motors 40 of the injection plunger units 15a, 15b, and 15c.

  In the first embodiment, one cavity 10 is provided in one injection mold 5 for molding a large molded product, but the injection mold 5 shows the second embodiment. You may comprise as shown to Fig.5 (a) (b).

  That is, FIG. 5A shows, for example, three cavities 10a, 10b, and 10c so that a plurality of molded products having the same shape can be formed simultaneously with one injection mold 5, and three injection plunger units 15a. , 15b, and 15c, the molten resin is simultaneously injected into the cavities 10a, 10b, and 10c.

  In FIG. 5B, for example, three cavities 10a ′, 10b ′, and 10c ′ are provided so that a plurality of molded products having different shapes and sizes can be simultaneously formed with one injection mold 5; The molten resin is injected from the injection nozzles 48 of the injection plunger units 15a, 15b, 15c into the cavities 10a ′, 10b ′, 10c ′ simultaneously or with a time difference. In either case, the injection speed can be controlled by individually controlling the rotation speed of the servo motor 40 of the injection plunger units 15a, 15b, and 15c.

  When molding a plurality of molded products having different sizes of large, medium, and small with one injection mold 5, for example, the clamping force of the small molded product is 220 t, and the clamping force of the medium molded product is 350 t. If the mold clamping force of a large molded product is 550 t, a large mold clamping force of 220 t + 350 t + 550 t = 1120 t is required when molding is performed simultaneously.

  However, when molten resin is injected from the injection nozzles 48 of the three injection plunger units 15a, 15b, and 15c into the cavities 10a ′, 10b ′, and 10c ′ with a time difference, mold clamping is performed to mold the largest molded product. Since the force can be set, a mold clamping force of 550 t is sufficient. Therefore, since no large-scale equipment is required and the rigidity of the injection mold 5 can be reduced, the injection mold 5 can be molded at low cost.

  6 to 8 show a third embodiment, FIG. 6 is a view showing a cavity shape of an injection mold, FIG. 7 is a longitudinal front view showing a part of three injection plunger units, and FIG. It is sectional drawing which follows the AA line of 7. FIG.

  As shown in FIG. 6, a large cavity 61a is provided in the injection mold 60 to form a large molded product as shown by a solid line, and a small cavity as shown by a two-dot chain line to form a small molded product. In the case of providing 61b, since the intervals of the resin passages 62a, 62b, 62c for injecting the molten resin into the cavities 61a, 61b are different, the intervals of the nozzle touch portions (not shown) provided in the injection mold 60 are also different. It will be. Therefore, as in the first embodiment, when the molten resin is injected into the cavity from a plurality of locations by the three injection plunger units 15a, 15b, and 15c, the intervals between the injection plunger units 15a, 15b, and 15c are constant. The intervals between the injection nozzles 48 of the injection plunger units 15a, 15b, and 15c do not coincide with the nozzle touch portion of the injection mold 60.

  Therefore, in the second embodiment, as shown in FIGS. 7 and 8, the interval between the left injection plunger unit 63b and the right injection plunger unit 63c with respect to the central injection plunger unit 63a, that is, the interval between the injection nozzles can be varied. This is to cope with the change in the interval between the nozzle touch portions in accordance with the interval between the resin passages 62a, 62b, 62c provided in the injection mold 60.

  That is, the fixed die plate 2 of the mold clamping apparatus 1 is provided with a lift plate 65 that can be moved up and down by a hydraulic cylinder 64. Three unit support blocks 66a, 66b, 66c are supported on the elevating plate 65. The central unit support block 66 a is fixed to the lifting plate 65, and the left and right unit support blocks 66 b and 66 c are supported to be movable in the lateral direction with respect to the lifting plate 65.

  Further, the central injection plunger unit 63a is fixed to the central unit support block 66a, and the injection cylinder 68 having the injection plunger 68a of the central injection plunger unit 63a passes through the central unit support block 66a in the vertical direction. It communicates with the injection nozzle 70 a through 69. Similarly, a left injection plunger unit 63b and a right injection plunger unit 63c are fixed to the left and right unit support blocks 66b and 66c, and an injection cylinder 68 passes through the left and right unit support blocks 66 and 66c in the vertical direction. The nozzles 70b and 70c communicate with each other.

  Further, a lateral resin passage 72 having a resin introduction portion 71 is provided in the central unit support block 66 a and communicates with the longitudinal resin passage 69. A branch resin passage 73 is branched from the middle portion of the lateral resin passage 72, and the branch resin passage 73 is provided on the left and right unit support blocks 66 and 66c via a flexible tube 74 such as a Teflon (registered trademark) tube. Is communicated with a resin passage penetrating in the vertical direction. Accordingly, the molten resin is distributed from the lateral resin passage 72 having the resin introduction portion 71 of the central unit support block 66a to the resin passages of the left and right unit support blocks 66 and 66c.

  An air cylinder 75 is fixed to the left and right unit support blocks 66b and 66c in the lateral direction, and the tip of the rod 76 of the hydraulic cylinder 75 is connected to the central unit support block 66a. Accordingly, the air cylinder 75 allows the left and right unit support blocks 66b and 66c to move in the direction of the arrow with respect to the central unit support block 66a so that the interval with respect to the central unit support block 66a can be varied.

  A plasticizing cylinder 17 of the plasticizing device 16 similar to that of the first embodiment is directly connected to the resin introducing portion 71 of the central unit support block 66a so that molten resin is supplied.

  Next, the operation of the third embodiment will be described.

  As shown in FIG. 6, when the molten resin is injected into the large cavity 61a of the injection mold 60, the air cylinder 75 leaves the left and right unit support blocks 66b and 66c with respect to the central unit support block 66a. Move to. Then, the injection nozzles 70b and 70c of the left injection plunger unit 63b and the right injection plunger unit 63c are positioned in the resin passages 62b and 62c of the injection mold 60. When the molten resin is injected into the small cavity 61b of the injection mold 60, the left and right unit support blocks 66b and 66c are moved in the direction approaching the central unit support block 66a by the air cylinder 75. Then, the injection nozzles 70b and 70c of the left injection plunger unit 63b and the right injection plunger unit 63c are positioned in the resin passages 62b and 62c of the injection mold 60.

  In this state, when the molten resin is introduced from the plasticizing cylinder 17 of the plasticizing device 16 into the resin introducing portion 71 of the central unit support block 66a, the molten resin passes through the resin passages 72 and 69 to the central injection plunger unit 63a. It is introduced into the injection cylinder 68. At the same time, the resin passage 72 is introduced into the injection cylinders 68 of the left and right injection plunger units 63b and 63c through the branch resin passage 73 and the flexible tube 74.

  When molten resin is introduced into the injection cylinders 68 of the central injection plunger unit 63a and the left and right injection plunger units 63b and 63c, the injection plunger 68a is gradually pushed up by the resin pressure. When the amount of molten resin to be injected into the cavity 61a (61b) of the injection mold 60 by each injection plunger unit 63a, 63b, 63c is measured, the molten resin introduced from the plasticizing device 16 stops.

  Next, when the injection plunger units 63a, 63b, and 63c are lowered by the hydraulic cylinder 64, the injection nozzles 70a, 70b, and 70c of the injection plunger units 63a, 63b, and 63c are resin passages 62a, 62b, and the injection mold 60, respectively. It joins to the nozzle touch part corresponding to 62c. In this state, when the injection plunger 68a of each injection plunger unit 63a, 63b, 63c is pushed down, the molten resin in the injection cylinder 68 passes from the injection nozzles 70a, 70b, 70c through the resin passages 62a, 62b, 62c to the cavity 61a ( 61b). The molten resin injected into the cavity 61a (61b) is cooled and solidified by the cooling water flowing through the cooling water channel surrounding the cavity 61a (61b).

  According to the present embodiment, molten resin is injected between the case where the injection mold 60 is provided with a large cavity 61a for forming a large molded product and the case where a small cavity 61b is provided for forming a small molded product. Even if the intervals between the resin passages 62a, 62b, and 62c to be changed are different, the intervals between the injection plunger units 63a, 63b, and 63c can be changed.

  Although the air cylinder 75 is provided as means for moving the injection plunger units 63a, 63b, and 63c in the lateral direction, it may be a hydraulic cylinder, a rack and pinion mechanism that is driven by a servo motor, or a ball screw mechanism.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Moreover, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

The front view of the injection molding apparatus of 1st Embodiment of this invention. The side view of the embodiment. The top view of the embodiment. The front view of the injection plunger unit of the embodiment. The 2nd Embodiment of this invention is shown, (a) (b) is a vertical front view of a different injection mold. The figure which shows 3rd Embodiment of this invention and shows the cavity shape of an injection mold. The longitudinal section front view showing a part of three injection plunger units of the embodiment. Sectional drawing which shows the same embodiment and follows the AA line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Clamping apparatus, 2 ... Fixed die plate, 4 ... Moving die plate, 5 ... Injection mold, 6 ... Fixed mold, 7 ... Moving mold, 11a-11c ... Nozzle touch surface, 15a-15c ... Injection Plunger unit, 16 ... plasticizing device

Claims (6)

A mold having one or more cavities;
A plurality of nozzle touch portions provided in the mold and communicating with the cavity;
A plurality of injection plunger units having nozzles that are independently joined to the plurality of nozzle touch portions, and injecting a molten resin into the cavity of the mold;
An injection molding apparatus comprising: A mold having one or more cavities;
A plurality of nozzle touch portions provided in the mold and communicating with the cavity;
A plurality of injection plunger units having nozzles that are independently joined to the plurality of nozzle touch portions, and injecting a molten resin into the cavity of the mold;
A plasticizer for plasticizing a synthetic resin material and supplying the plasticized molten resin to the plurality of injection plunger units;
An injection molding apparatus comprising: The injection molding apparatus according to claim 1 or 2, wherein at least one of the plurality of injection plunger units is movable in accordance with a position of a nozzle touch portion of the mold. The injection molding apparatus according to claim 1 or 2, wherein each of the plurality of injection plunger units is provided with a valve gate. 3. The injection molding apparatus according to claim 1, wherein the plurality of injection plunger units have a function of measuring and injecting molten resin. The injection molding apparatus according to claim 2, wherein the plasticizing apparatus and the plurality of injection plunger units are connected by a flexible resin supply pipe.

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