Connecting pipe and molten resin supply system

Abstract

To allow molten resin output from an output device and input to a heating cylinder to flow without stagnation and without affecting a movement of the heating cylinder.SOLUTION: A connecting pipe that connects an output device that outputs molten resin to be recycled from an output port, with an injection molding machine having: a heating cylinder that has an input port for inputting the output molten resin and heats the molten resin; and an injection cylinder that is separate from the heating cylinder and injects the heated molten resin into a mold, has one end connected to the output port and the other end connected to the input port, thereby connecting the output device and the injection molding machine, has heat resistance to an extent that it can withstand a temperature of the molten resin, has an inner surface that is smooth enough that the molten resin does not remain, and is elastically deformable in response to a movement of the heating cylinder.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a connecting pipe and a molten resin supply system. [Background technology]

[0002] Patent Document 1 describes an injection tube that includes a tube having a through hole through which the raw material liquid passes, an injection nozzle attached to the tip of the tube, an injection tube connector attached to the rear end of the tube, and an injection tube end holder attached to the injection tube connector. It also describes that if the injection tube connector is made of resin and the discharge port plate and the injection tube end holder are made of metal (e.g., stainless steel), the injection tube connector is deformed and the sealing performance is improved by being pressed by the injection tube end holder when the injection tube contact surface of the discharge port plate and the contact surface of the injection tube connector come into contact, and the injection tube end holder has high durability against contact and sliding with the pressure contact pin. It also describes that the material of the tube connected to the injection nozzle is not particularly limited, but is preferably a resin having flexibility and elasticity, and is preferably a material having high heat resistance, in that the tube and the injection nozzle can be fixed by utilizing the elasticity of the tube and the injection nozzle can be freely moved. Patent Document 2 describes a pipe in which the male threads of a fastening member are screwed into the female threads of a cylindrical connecting member, causing both ends of the cylindrical connecting member or their vicinity to elastically deform in the axial direction, thereby screwing the fastening member to the cylindrical connecting member. Patent Document 3 describes a molding core in which the release layer is made of a silicone-based resin composition, and therefore has heat resistance sufficient to withstand the formation temperature of a seamless tubular molding, and which makes it easy to control the water contact angle on the surface of the molding core. Patent Document 4 describes a cylindrical core body having a cylindrical substrate and a release layer formed on the surface of the cylindrical substrate, in which convex portions of the uneven surface of the release layer are polished, and the release layer contains a heat-resistant resin. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2006-231600 A [Patent Document 2] JP 2000-72860 A [Patent Document 3] JP 2009-56748 A [Patent Document 4] JP 2009-12307 A Summary of the Invention [Problem to be solved by the invention]

[0004] A connecting tube that does not have any of the following characteristics cannot allow the molten resin output from the output device and input to the heating cylinder to flow without stagnation and without affecting the movement of the heating cylinder.

[0005] An object of the present invention is to allow molten resin output from an output device and input to a heating cylinder to flow without stagnation and without affecting the movement of the heating cylinder. [Means for solving the problem]

[0006] With this objective in mind, the present invention provides a connecting pipe that connects an output device that outputs molten resin to be recycled from an output port, and an injection molding machine that has an input port for inputting the outputted molten resin, a heating cylinder that heats the molten resin, and an injection cylinder that is independent of the heating cylinder and injects the heated molten resin into a mold, the connecting pipe having one end connected to the output port and the other end connected to the input port, connecting the output device and the injection molding machine, having heat resistance sufficient to withstand the temperature of the molten resin, having an inner surface that is smooth enough so that the molten resin does not remain, and being elastically deformable in response to the movement of the heating cylinder.

[0007] First, the connecting pipe may be elastically deformable against bending by having a corrugated outer surface with repeated peaks and valleys and a smooth inner surface that is closer to a straight line than the outer surface by connecting the repeated valleys. In this case, the connecting pipe may be elastically deformable against tension by being configured with a straight pipe having a natural length longer than the distance between the output device and the heating cylinder and having a shape bent at a bending portion.

[0008] Secondly, the connecting pipe may be elastically deformable by being configured of a pipe having a shape that is bent at the bent portion from the beginning.

[0009] In any of these connecting pipes, the bent portion may be rotatable around an axis connecting the output port and the input port.

[0010] Furthermore, the present invention also provides a connecting pipe that connects an output device that outputs molten resin to be recycled from an output port, and an injection molding machine that has an input port for inputting the outputted molten resin, a heating cylinder that heats the molten resin, and an injection cylinder that is independent of the heating cylinder and injects the heated molten resin into a mold, the connecting pipe having one end connected to the output port and the other end connected to the input port, connecting the output device and the injection molding machine, having heat resistance sufficient to withstand the temperature of the molten resin, having a corrugated outer surface with repeated peaks and valleys, and an inner surface that is closer to being linear than the outer surface, and being elastically deformable in response to the movement of the heating cylinder.

[0011] The manifold may have an inner surface that is straight.

[0012] The present invention also provides a molten resin supply system comprising: an output device that outputs molten resin to be recycled from an output port; an injection molding machine having an input port for inputting the outputted molten resin, a heating cylinder that heats the molten resin, and an injection cylinder that is independent of the heating cylinder and injects the heated molten resin into a mold; and a connecting pipe that connects the output device to the injection molding machine, wherein the connecting pipe has one end connected to the output port and the other end connected to the input port, thereby connecting the output device to the injection molding machine, has heat resistance sufficient to withstand the temperature of the molten resin, has an inner surface that is smooth enough so that the molten resin does not remain, and is elastically deformable in response to the movement of the heating cylinder.

[0013] Furthermore, the present invention also provides a molten resin supply system comprising: an output device that outputs molten resin to be recycled from an output port; an injection molding machine having an input port for inputting the outputted molten resin, a heating cylinder that heats the molten resin, and an injection cylinder that is independent of the heating cylinder and injects the heated molten resin into a mold; and a connecting pipe that connects the output device to the injection molding machine, one end of the connecting pipe being connected to the output port and the other end being connected to the input port, thereby connecting the output device to the injection molding machine, the connecting pipe having a heat resistance sufficient to withstand the temperature of the molten resin, a corrugated outer surface with repeated peaks and valleys, and an inner surface that is closer to being linear than the outer surface, and being elastically deformable in response to the movement of the heating cylinder. Effect of the Invention

[0014] According to the present invention, the molten resin output from the output device and input to the heating cylinder can be made to flow without stagnation and without affecting the movement of the heating cylinder. [Brief description of the drawings]

[0015] [Figure 1] 1 is a diagram showing a configuration example of a molten resin supply system to which the present embodiment is applied; [Diagram 2] FIG. 1 is a schematic configuration diagram of an injection molding machine. [Diagram 3] 1(a) and 1(b) are diagrams showing characteristics of a conventional metal flexible hose. [Figure 4] FIG. 2 is a diagram showing a connecting pipe according to the first embodiment. [Diagram 5] 13(a) to 13(c) are diagrams showing a state before the heating cylinder is retracted when an initial bend is applied to a connecting pipe. [Figure 6] 13(a) and 13(b) are diagrams showing a state after the heating cylinder is retracted when an initial bend is applied to a connecting pipe. [Figure 7] 13(a) to 13(c) are diagrams showing a state before the heating cylinder is retracted when the connecting pipe is constituted by a curved circular pipe. [Figure 8] 13(a) and 13(b) are diagrams showing the state after the heating cylinder has been retracted when the connecting pipe is constituted by a curved circular pipe. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0017] [Molten resin supply system configuration] FIG. 1 is a diagram showing an example of the configuration of a molten resin supplying system 1 to which the present embodiment is applied. As shown in the figure, the molten resin supply system 1 includes a connecting pipe 10, connection members 31 and 32, a decontamination machine 80, and an injection molding machine 90.

[0018] The connecting pipe 10 is a pipe that connects the decontamination machine 80, which is arranged on a first side in the direction in which the decontamination machine 80 and the injection molding machine 90 are connected (hereinafter referred to as the "connection direction"), to the injection molding machine 90, which is arranged on a second side.

[0019] The connection member 31 is a member for connecting the connecting pipe 10 to the decontamination machine 80 described later, and is fixed to the decontamination machine 80 with a flange or the like. Specifically, the connection member 31 has a first end in the connection direction connected to the output port 801 of the decontamination machine 80, and a second end in the connection direction connected to the connecting pipe 10. The connection member 31 and the connecting pipe 10 are connected by sandwiching a rubber O-ring serving as a sealing member therebetween and fixing them with bolts or the like.

[0020] The connecting member 32 is a member for connecting the connecting pipe 10 to an injection molding machine 90 described later, and is fixed to the injection molding machine 90 with a flange or the like. Specifically, the connecting member 32 has a first end in the connecting direction connected to the connecting pipe 10, and a second end in the connecting direction connected to an input port 911 provided in a heating cylinder 91 of the injection molding machine 90. The connecting member 32 and the connecting pipe 10 are connected by sandwiching a rubber O-ring serving as a sealing member therebetween and fixing them with bolts or the like.

[0021] The decontamination machine 80 is a device that uses mechanical recycling (physical regeneration method) and chemical recycling (chemical regeneration method) to decontaminate contaminants contained inside the resin of PET bottles and the like to be recycled, and outputs it as molten resin. "Mechanical recycling" refers to a series of processes in which the resin of collected used PET bottles and the like is sorted, crushed, and washed to remove dirt and foreign matter from the surface, and then exposed to high temperatures to melt the resin, and the contaminants remaining inside are decontaminated, for example, by diffusing them in the vacuum inside the decontamination machine 80. "Chemical recycling" refers to a series of processes in which the resin of collected used PET bottles and the like is sorted, chemically decomposed, and repolymerized to decontaminate contaminants.

[0022] As described above, the decontamination machine 80 has an output port 801 for outputting the decontaminated resin as molten resin. The connection pipe 10 is connected to the output port 801 via the connection member 31, and the molten resin decontaminated by the decontamination machine 80 is input to the connection pipe 10 from the connection member 31 connected to the output port 801. The decontamination machine 80 is an example of an output device that outputs molten resin.

[0023] The injection molding machine 90 is a molding machine used to manufacture molded articles using molten resin as a material. The injection molding machine 90 is connected to the decontamination machine 80 via a connecting pipe 10, so that the injection molding machine 90 can receive the molten resin output from the decontamination machine 80 and manufacture molded articles using the molten resin as a material.

[0024] FIG. 2 is a schematic diagram of the injection molding machine 90. As shown in the figure, the injection molding machine 90 includes a heating cylinder 91, an injection cylinder 92, and a mold 93. The injection molding machine 90 is a so-called pre-plunger type (also called pre-plasticizer type) injection molding machine that combines the independent heating cylinder 91 and injection cylinder 92. For this reason, the longitudinal axis of the heating cylinder 91 and the longitudinal axis of the injection cylinder 92 are not coaxial.

[0025] The heating cylinder 91 is a cylinder that heats the molten resin that is the material of the molded product and sends a required amount of molten resin to the injection cylinder 92. The heating cylinder 91 has an input port 911 for inputting the molten resin, a screw 912 for heating the input molten resin, and an output port 913 for outputting the heated molten resin. The heating cylinder 91 heats the molten resin using shear heat generated by rotating the screw 912 and heat from a band heater (not shown), and outputs the molten resin from the output port 913 toward the injection cylinder 92. The band heater is, for example, a lightweight and thin cylindrical heater insulated with a heat-resistant mica plate and exteriorly covered with a stainless steel plate. The band heater has a smooth inner surface that contacts the pipe, so that it can be easily attached to the cylindrical pipe.

[0026] The injection cylinder 92 is a cylinder that injects molten resin toward the inside of the mold 93. The injection cylinder 92 includes an input port 921 for inputting the molten resin output from the output port 913 of the heating cylinder 91, a plunger 922 that pressurizes the input molten resin toward the second side in the longitudinal direction, and an injection port 923 that injects the pressurized molten resin into the inside of the mold 93. The mold 93 molds the molten resin by opening and closing the mold, and cools and solidifies it to complete a molded product (for example, a product, a preform of a product).

[0027] [Background of this embodiment] In the molten resin supply system 1 shown in FIG. 1, the decontamination machine 80 is a large machine and operates in a fixed state. On the other hand, the heating cylinder 91 of the injection molding machine 90 moves toward the mold 93 as described in Fig. 2. In the following, the direction in which the heating cylinder 91 approaches the mold 93 is referred to as "forward", and movement in that direction is referred to as "advancing". The direction in which the heating cylinder 91 moves away from the mold 93 is referred to as "rear", and movement in that direction is referred to as "retreating". Movement of the heating cylinder 91 occurs, for example, when the heating cylinder 91 discharges (purges) molten resin. That is, in the molten resin supply system 1 shown in FIG. 1, the fixed decontamination machine 80 and the moving heating cylinder 91 are connected by a connecting pipe 10, so this connecting pipe 10 needs to absorb the movement of the heating cylinder 91.

[0028] Therefore, in this embodiment, the connecting pipe 10 is made elastically deformable in response to the movement of the heating cylinder while being connected to the decontamination machine 80 and the injection molding machine 90. Methods for making the connecting pipe 10 elastically deformable in this way include a method of using a flexible hose with a smooth inner surface and giving this an initial bend, and a method of using a curved circular pipe.

[0029] Hereinafter, the former method will be described as a first embodiment, and the latter method will be described as a second embodiment.

[0030] [First embodiment] The connecting pipe 11 in the first embodiment is required to be heat resistant, have a smooth inner surface, and bend flexibly. Here, heat resistance refers to heat resistance to the extent that it can withstand the temperature of the molten resin (approximately 300°C). The inner surface needs to be smooth so that the molten resin passing through the connecting pipe 11 does not remain. Therefore, a smooth inner surface preferably has a shape closer to a straight line than the outer surface to the extent that the molten resin does not remain, and more preferably has a straight line. However, it is not required that all the molten resin does not remain, and it is sufficient that a certain percentage or more of the molten resin does not remain.

[0031] Meanwhile, a flexible metal hose is known as a hose that is heat resistant and can bend flexibly, but the inner surface of the flexible metal hose is not smooth. On the other hand, flexible hoses made of resin or rubber are flexible and bendable, and have a smooth inner surface, but do not have heat resistance.

[0032] Therefore, in the first embodiment, the connecting pipe 10 is formed using a conventional metallic flexible hose. The reason why conventional metal flexible hoses are flexible in both tension and bending despite being made of metal is believed to be due to the following characteristics.

[0033] 3(a) and (b) are diagrams showing characteristics of a conventional metal flexible hose 19. The conventional metal flexible hose 19 shows corrugations 191 and 192, which are left and right portions of a cross section of a corrugated portion in which peaks and valleys surrounding a flow path 190 through which molten resin flows are repeated. In FIG. 3(a), when the conventional metal flexible hose 19 is stretched or compressed in the direction indicated by the arrow A1, the portions of the corrugations 191 and 192 indicated by circles P11 and P12 are portions where bending occurs. In FIG. 3(b), when the conventional metal flexible hose 19 is bent in the direction indicated by the arrow A2, the portions of the corrugations 191 and 192 indicated by circles P21 to P24 are portions where bending occurs. That is, in the conventional metal flexible hose 19, the corrugations 191 and 192 are dotted with portions where bending occurs, which are portions that are easily deformed.

[0034] However, in a conventional metal flexible hose 19 as shown in Figures 3(a) and (b), when molten resin is flowed through a flow path 190, the molten resin may accumulate in the spaces inside the corrugations 191 and 192. For example, in Figure 3(a), the molten resin may accumulate in the spaces S11 and S12, and in Figure 3(b), the molten resin may accumulate in the spaces S21 and S22.

[0035] Therefore, in the first embodiment, when the connecting pipe 11 is bent in the direction indicated by the arrow A2, the portion on which the bending acts is only half of the portion on which the bending acts shown in FIG. 3(b), and instead the inner surface is made smooth.

[0036] FIG. 4 is a diagram showing the connecting pipe 11 in the first embodiment. As shown in the figure, in the connecting pipe 11, among the parts indicated by the circles P21 to P24 in FIG. 3(b), only the parts indicated by the circles P21 and P22 remain as parts that will be bent when bending in the direction indicated by the arrow A3. The space inside the corrugated part of the connecting pipe 11 is filled to form a smooth inner surface. Here, the space S21 inside the wave part 111, which is the left part of the cross section of the corrugated part surrounding the flow path 110, and the space S22 inside the wave part 112, which is the right part of the cross section of the corrugated part surrounding the flow path 110, are filled. The figure shows an inner surface 113 that connects the parts indicated by the circles P21 formed by filling the space S1, and an inner surface 114 that connects the parts indicated by the circles P22 formed by filling the space S2. The wavy portions 111 and 112 are an example of a wavy outer surface having repeated peaks and valleys, and the inner surfaces 113 and 114 are an example of a smooth inner surface in which repeated valleys are connected. However, since it is considered to be difficult to actually fill the space inside the wavy portion of the connecting pipe 11, it is preferable to manufacture the connecting pipe 11 by cutting or rolling a circular pipe having a certain thickness.

[0037] However, it is considered that such a connecting pipe 11 is flexible in bending but rigid in tension. Therefore, in the first embodiment, an initial bend is imparted to the connecting pipe 11. Although the outer surface of the connecting pipe 11 is, strictly speaking, wavy, in the following description, it is shown by double lines for simplification.

[0038] 5(a) to (c) are diagrams showing a state before the heating cylinder 91 is retracted when the connecting pipe 11 is initially bent.

[0039] 5(c) shows the natural state of the connecting pipe 11. As shown in the figure, a straight pipe having a natural length D1 longer than the distance between the decontamination machine 80 and the heating cylinder 91 is used as the connecting pipe 11. Note that, in the configuration example shown in FIG. 1, the distance between the decontamination machine 80 and the heating cylinder 91 may be the length from the connection point between the connecting pipe 10 and the connection member 31 to the connection point between the connecting pipe 10 and the connection member 32.

[0040] Figure 5(a) shows a side view of a portion of the molten resin supply system 1 consisting of the connecting pipe 11, the decontamination machine 80, and the heating cylinder 91 before the heating cylinder 91 is retracted, and Figure 5(b) shows a rear view of the portion of the molten resin supply system 1 before the heating cylinder 91 is retracted. First, as shown in Fig. 5(b), a load is applied to the connecting pipe 11 shown in Fig. 5(c) in the direction indicated by the arrow A4 to bend it at the bending portion C1 and connect it to the heating cylinder 91. Note that, since the connecting pipe 11 is bent in a vertical plane perpendicular to the side surface, the bent state of the connecting pipe 11 is not visible in Fig. 5(a).

[0041] Furthermore, in the connecting pipe 11 bent in this manner, in order to reduce the molten resin remaining in the connecting pipe 11, the bent portion C1 may be made rotatable around an axis R1 connecting the output port 801 of the decontamination machine 80 and the input port 911 of the heating cylinder 91.

[0042] 6(a) and (b) are diagrams showing the state after the heating cylinder 91 is retracted when the connecting pipe 11 is initially bent.

[0043] Figure 6(a) shows a side view of a portion of the molten resin supply system 1 consisting of the connecting pipe 11, the decontamination machine 80, and the heating cylinder 91 after the heating cylinder 91 has been retracted, and Figure 6(b) shows a rear view of the portion of the molten resin supply system 1 after the heating cylinder 91 has been retracted. When the heating cylinder 91 retracts, as shown in Fig. 6(a), the connecting pipe 11 elastically deforms with the end on the second side in the connecting direction connected to the heating cylinder 91. Note that, since the connecting pipe 11 elastically deforms in a plane parallel to the side surface, the deformed state of the connecting pipe 11 is not visible in Fig. 6(b).

[0044] As described above, the connecting pipe 11 in the first embodiment is provided with heat resistance, inner smoothness, and flexibility by using the conventional metallic flexible hose 19. This makes it possible to use a highly versatile pipe to allow the highly adhesive high-temperature molten resin to flow without stagnation while not affecting the movement of the heating cylinder 91.

[0045] [Second embodiment] The connecting pipe 12 in the second embodiment is also required to have heat resistance, a smooth inner surface, and bend flexibly. The significance of heat resistance and a smooth inner surface is the same as in the first embodiment. However, in the second embodiment, the connecting pipe 12 is configured as a curved circular pipe from the beginning (hereinafter referred to as a "curved circular pipe"). The decontamination machine 80 and the heating cylinder 91 are connected by this connecting pipe 12, and the connecting pipe 12 can be relatively easily deformed by bending or twisting when the heating cylinder 91 is moved. Note that, although the following description is given as a circular pipe, it does not have to be a circular pipe strictly, and it may be a pipe having a slightly distorted circular cross section.

[0046] 7(a) to (c) are diagrams showing a state before the heating cylinder 91 is retracted when the connecting pipe 12 is configured as a curved circular pipe.

[0047] 7(c) shows the natural state of the connecting pipe 12. As shown in the figure, the connecting pipe 12 is a pipe that has a shape that is bent at the bent portion C2 from the beginning and has a natural length D2 that is equal to the distance between the decontamination machine 80 and the heating cylinder 91. Here, "bent from the beginning" means that the pipe is not bent by applying force, but is bent at the time of manufacture.

[0048] Figure 7(a) shows a side view of a portion of the molten resin supply system 1 consisting of the connecting pipe 12, the decontamination machine 80, and the heating cylinder 91 before the heating cylinder 91 is retracted, and Figure 7(b) shows a rear view of the portion of the molten resin supply system 1 before the heating cylinder 91 is retracted. First, as shown in Fig. 7(b), the connecting pipe 12 shown in Fig. 7(c) is connected to the heating cylinder 91 as it is. Note that, since the connecting pipe 12 is bent in a vertical plane perpendicular to the side surface, the bent state of the connecting pipe 12 is not visible in Fig. 7(a).

[0049] Furthermore, in a connecting pipe 12 bent in this manner, in order to reduce the molten resin remaining in the connecting pipe 12, the bent portion C2 may be made rotatable around an axis R2 connecting the output port 801 of the decontamination machine 80 and the input port 911 of the heating cylinder 91.

[0050] 8(a) and (b) are diagrams showing the state after the heating cylinder 91 has been retracted when the connecting pipe 12 is configured as a curved circular pipe.

[0051] Figure 8(a) shows a side view of a portion of the molten resin supply system 1 consisting of the connecting pipe 12, the decontamination machine 80, and the heating cylinder 91 after the heating cylinder 91 has been retracted, and Figure 8(b) shows a rear view of the portion of the molten resin supply system 1 after the heating cylinder 91 has been retracted. 8(a) and (b), when the heating cylinder 91 retracts, the connecting pipe 12 elastically deforms with the end portion on the second side in the connecting direction being connected to the heating cylinder 91. That is, the connecting pipe 12 elastically deforms relatively easily due to bending or twisting action.

[0052] As described above, the connecting pipe 12 in the second embodiment is made to have heat resistance, inner surface smoothness, and flexibility by using a curved circular pipe. This makes it possible to flow the highly adhesive high-temperature molten resin without causing retention, while not affecting the movement of the heating cylinder 91, without bending the circular pipe.

[0053] [Other embodiments] Although the embodiment of the present invention has been described above, the present invention is not limited to the above-mentioned embodiment. Moreover, the effects of the present invention are not limited to those described in the above-mentioned embodiment. For example, the configuration of the molten resin supply system 1 in FIG. 1 and FIG. 2 is not limited to this. Moreover, the aspects of the connecting pipe 11 in FIG. 4 to FIG. 6 and the aspects of the connecting pipe 12 in FIG. 7 and FIG. 8 are merely examples for achieving the object of the present invention, and are not particularly limited. Furthermore, the decontamination machine 80 and the heating cylinder 91 are merely examples of the fixed side device and the movable side device, respectively, and this embodiment may be applied when connecting another type of fixed side device and movable side device.

[0054] [summary] The connecting pipes 11, 12 and the molten resin supplying system 1 in this embodiment only need to have the following configuration, and can take various forms.

[0055] In other words, the connecting pipes 11, 12 in this embodiment are connecting pipes 11, 12 that connect an output device (e.g., decontamination machine 80) that outputs molten resin to be recycled from an output port 801, and an injection molding machine 90 that has an input port 911 for inputting the outputted molten resin, a heating cylinder 91 that heats the molten resin, and an injection cylinder 92 that is independent of the heating cylinder 91 and injects the heated molten resin into a mold 93, and have one end connected to the output port 801 and the other end connected to the input port 911, thereby connecting the output device (e.g., decontamination machine 80) and the injection molding machine 90, have heat resistance sufficient to withstand the temperature of the molten resin, have inner surfaces 113, 114 that are smooth enough so that the molten resin does not stagnate, and are elastically deformable in response to the movement of the heating cylinder 91. This allows the molten resin output from an output device (for example, the decontamination machine 80) and input to the heating cylinder 91 to flow without stagnation and without affecting the movement of the heating cylinder 91.

[0056] First, the connecting pipe 11 may be elastically deformable when bent by having a corrugated outer surface (e.g., corrugations 111, 112) with repeated peaks and valleys, and smooth inner surfaces 113, 114 that connect the repeated valleys to form a shape closer to a straight line than the outer surface. This makes it possible to use a highly versatile pipe to allow the molten resin output from an output device (e.g., decontamination machine 80) and input to the heating cylinder 91 to flow without stagnation and without affecting the movement of the heating cylinder 91.

[0057] In this case, the connecting pipe 11 may be elastically deformable even under tension by being constructed from a straight pipe having a natural length D1 longer than the distance between the output device (e.g., the decontamination machine 80) and the heating cylinder 91 and a bent shape at a bending portion. This makes it possible to ensure elasticity against tension that could not be ensured by simply connecting the repeated valleys of a versatile tube to form smooth inner surfaces 113, 114.

[0058] The bent portion C1 of the connecting pipe 11 may be rotatable around an axis R1 connecting the output port 801 and the input port 911. This makes it possible to reduce the amount of molten resin remaining in the bent portion C1.

[0059] Secondly, the connecting pipe 12 may be elastically deformable by being configured from a pipe having a shape that is bent at the bent portion from the beginning. This allows the molten resin output from an output device (e.g., decontamination machine 80) and input to the heating cylinder 91 to flow without stagnation and without affecting the movement of the heating cylinder 91, without the need to bend pipes.

[0060] The bent portion C2 of the connecting pipe 12 may be rotatable around an axis R2 connecting the output port 801 and the input port 911. This makes it possible to reduce the amount of molten resin remaining in the bent portion C2.

[0061] Furthermore, the connecting pipe 11 in this embodiment is a connecting pipe 11 that connects an output device (e.g., decontamination machine 80) that outputs the molten resin to be recycled from an output port 801, and an injection molding machine 90 that has an input port 911 for inputting the outputted molten resin and has a heating cylinder 91 that heats the molten resin and an injection cylinder 92 that is independent of the heating cylinder 91 and injects the heated molten resin into a mold 93, and has one end connected to the output port 801 and the other end connected to the input port 911, thereby connecting the output device (e.g., decontamination machine 80) and the injection molding machine 90, has heat resistance sufficient to withstand the temperature of the molten resin, has a corrugated outer surface (e.g., wave portions 111, 112) in which peaks and valleys are repeated, and inner surfaces 113, 114 that are closer to a straight line than the outer surfaces (e.g., wave portions 111, 112), and is elastically deformable in response to the movement of the heating cylinder 91. This allows the molten resin output from an output device (for example, the decontamination machine 80) and input to the heating cylinder 91 to flow without stagnation and without affecting the movement of the heating cylinder 91.

[0062] The connecting tube 11 may have inner surfaces 113, 114 that are straight. This allows the molten resin output from an output device (e.g., decontamination machine 80) and input to the heating cylinder 91 to flow without stagnation and without affecting the movement of the heating cylinder 91.

[0063] Moreover, the molten resin supply system 1 in this embodiment includes an output device (e.g., decontamination machine 80) that outputs the molten resin to be recycled from an output port 801, an injection molding machine 90 having an input port 911 for inputting the output molten resin and having a heating cylinder 91 that heats the molten resin and an injection cylinder 92 that is independent of the heating cylinder 91 and injects the heated molten resin into a mold, and connecting pipes 11, 12 that connect the output device (e.g., decontamination machine 80) and the injection molding machine 90, one end of the connecting pipes 11, 12 is connected to the output port 801 and the other end is connected to the input port 911, thereby connecting the output device (e.g., decontamination machine 80) and the injection molding machine 90, has heat resistance sufficient to withstand the temperature of the molten resin, has inner surfaces 113, 114 that are smooth enough so that the molten resin does not stagnate, and is elastically deformable in response to the movement of the heating cylinder 91. This allows the molten resin output from an output device (for example, the decontamination machine 80) and input to the heating cylinder 91 to flow without stagnation and without affecting the movement of the heating cylinder 91.

[0064] Furthermore, the molten resin supply system 1 in this embodiment includes an output device (e.g., decontamination machine 80) that outputs the molten resin to be recycled from an output port 801, an injection molding machine 90 having an input port 911 for inputting the output molten resin and having a heating cylinder 91 that heats the molten resin and an injection cylinder 92 that is independent of the heating cylinder 91 and injects the heated molten resin into a mold, and a connecting pipe 11 that connects the output device (e.g., decontamination machine 80) and the injection molding machine 90, and the connecting pipe 11 is a molten resin supply system 1 having one end connected to an output port 801 and the other end connected to an input port 911, thereby connecting an output device (e.g., a decontamination machine 80) and an injection molding machine 90, having heat resistance sufficient to withstand the temperature of molten resin, having a corrugated outer surface (e.g., wave portions 111, 112) with repeated peaks and valleys, and inner surfaces 113, 114 that are closer to being linear than the outer surfaces (e.g., wave portions 111, 112), and being elastically deformable in response to the movement of the heating cylinder 91. This allows the molten resin output from an output device (for example, the decontamination machine 80) and input to the heating cylinder 91 to flow without stagnation and without affecting the movement of the heating cylinder 91. [Explanation of symbols]

[0065] 1...molten resin supply system, 10, 11, 12...connecting pipe, 110...flow path, 111, 112...wave portion, 113, 114...inner surface, 80...decontamination machine, 801...output port, 90...injection molding machine, 91...heating cylinder, 911...input port, 92...injection cylinder, 93...mold

Claims

1. A connecting pipe connecting an output device which outputs molten resin to be recycled from an output port, and an injection molding machine having an input port for inputting the output molten resin, a heating cylinder which heats the molten resin, and an injection cylinder which is independent of the heating cylinder and injects the heated molten resin into a mold, A connecting pipe having one end connected to the output port and the other end connected to the input port, thereby connecting the output device and the injection molding machine, having heat resistance sufficient to withstand the temperature of the molten resin, having an inner surface smooth enough that the molten resin does not remain, and being elastically deformable in response to the movement of the heating cylinder.

2. 2. The connecting pipe according to claim 1, having a corrugated outer surface with repeated peaks and valleys, and a smooth inner surface that connects the repeated valleys to form a shape closer to a straight line than the outer surface, thereby enabling elastic deformation when bent.

3. 3. The connecting pipe according to claim 2, wherein the connecting pipe is made of a straight pipe having a natural length longer than the distance between the output device and the heating cylinder and a bent portion having a bent shape, thereby enabling elastic deformation even under tension.

4. 2. The connecting pipe according to claim 1, wherein the connecting pipe is elastically deformable by being configured from a pipe having a shape that is initially bent at the bent portion.

5. The connecting pipe according to claim 3 or 4, wherein the bent portion is rotatable about an axis connecting the output port and the input port.

6. A connecting pipe connecting an output device which outputs molten resin to be recycled from an output port, and an injection molding machine having an input port for inputting the output molten resin, a heating cylinder which heats the molten resin, and an injection cylinder which is independent of the heating cylinder and injects the heated molten resin into a mold, a connecting tube having one end connected to the output port and the other end connected to the input port, connecting the output device and the injection molding machine, having heat resistance sufficient to withstand the temperature of the molten resin, having a wavy outer surface with repeated peaks and valleys, and an inner surface that is closer to being linear than the outer surface, and being elastically deformable in response to the movement of the heating cylinder.

7. The manifold of claim 6 having the inner surface that is straight.

8. an output device that outputs the molten resin to be recycled from an output port; an injection molding machine having an input port for inputting the output molten resin, the injection molding machine having a heating cylinder for heating the molten resin, and an injection cylinder independent of the heating cylinder for injecting the heated molten resin into a mold; a connecting pipe connecting the output device and the injection molding machine; Equipped with The connecting pipe has one end connected to the output port and the other end connected to the input port, thereby connecting the output device and the injection molding machine, has heat resistance sufficient to withstand the temperature of the molten resin, has an inner surface smooth enough that the molten resin does not stagnate, and is elastically deformable in response to the movement of the heating cylinder, in a molten resin supply system.

9. an output device that outputs the molten resin to be recycled from an output port; an injection molding machine having an input port for inputting the output molten resin, the injection molding machine having a heating cylinder for heating the molten resin, and an injection cylinder independent of the heating cylinder for injecting the heated molten resin into a mold; a connecting pipe connecting the output device and the injection molding machine; Equipped with The connecting pipe has one end connected to the output port and the other end connected to the input port, thereby connecting the output device and the injection molding machine, has heat resistance sufficient to withstand the temperature of the molten resin, has a corrugated outer surface with repeated peaks and valleys, and an inner surface that is closer to being linear than the outer surface, and is elastically deformable in response to the movement of the heating cylinder.

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