Resin supply device

Abstract

To stabilize quality of resin.SOLUTION: A resin supply device 10 includes a mixing head 12 having a mixing chamber 14 for mixing a first liquid and a second liquid, and a metering pump 50 for supplying a third liquid to the mixing chamber 14. The metering pump 50 is a pump capable of supplying the third liquid in the amount smaller than the first liquid and the second liquid. A delivery portion 56 in the metering pump 50 for delivering the third liquid is connected in contact with an injection portion 28 which communicates with the mixing chamber 14 in the mixing head 12.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] This invention relates to a resin supply device.

Background Art

[0002] In interior parts such as an instrument panel of an automobile, a polyurethane resin material is generally used to obtain a high-class feel of touch. When molding a polyurethane resin, for example, a mixing device called a mixing head is inserted into a predetermined mold and fixed, and a resin material is mixed and injected into the mold to mold a resin molded product. As this type of mixing device, one that countercurrently mixes a plurality of reactive resin components in a mixing chamber is known (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the device of Patent Document 1, the space between the tank containing the resin component and the nozzle for mixing the resin components is connected by a hose, and a high-pressure pump pumps the resin component from the tank to the nozzle through the hose. Therefore, the hose through which the resin component passes expands and contracts, and the supply amount of the resin component sent from the tank to the nozzle may fluctuate. In particular, when mixing a plurality of resin components, the resin component with a small supply amount among the plurality of resin components is greatly affected by the expansion and contraction of the hose, and the supply amount changes relatively greatly, so that the resulting resin becomes non-uniform.

[0005] In view of the above problems in the prior art, the present invention has been proposed to preferably solve these problems, and an object thereof is to provide a resin supply device capable of obtaining a resin with stable quality.

Means for Solving the Problems

[0006] A first aspect of the resin supply device according to the present invention is a mixing head having a mixing chamber for mixing a first liquid and a second liquid, and a metering pump for supplying a third liquid to the mixing chamber, wherein the metering pump is a pump capable of supplying a smaller amount of the third liquid than the first liquid and the second liquid, and the delivery part for delivering the third liquid in the metering pump is in contact with and connected to an injection part communicating with the mixing chamber in the mixing head.

[0007] A second aspect of the resin supply device according to the present invention is, in the first aspect, wherein the first liquid and the second liquid form a resin that is mixed and cured, and the third liquid may contain a coloring agent for coloring the resin.

[0008] A third aspect of the resin supply device according to the present invention is, in the first aspect or the second aspect, wherein the metering pump includes a cylinder for delivering the third liquid to the delivery part, and a check valve provided in a supply part for supplying the third liquid to the cylinder to prevent backflow of the third liquid to the supply part when the cylinder delivers the liquid, and the side surface of the cylinder may be in contact with the mixing head and attached to the mixing head.

[0009] A fourth aspect of the resin supply device according to the present invention is, in any one of the first aspect, the second aspect, and the third aspect, wherein the mixing chamber is connected to the discharge port of the mixing head, and in the mixing chamber, a first supply port for supplying the first liquid and a second supply port for supplying the second liquid are arranged opposite to each other, The injection port of the injection unit may be disposed on the virtual plane connecting the first supply port and the second supply port or on the side opposite to the discharge port with respect to the virtual plane.

[0010] A fifth aspect of the resin supply apparatus according to the present invention is any one of the first aspect, the second aspect, the third aspect, and the fourth aspect, The metering pump may be detachably attached to the mixing head.

Advantages of the Invention

[0011] According to the resin supply apparatus of the present invention, a resin of stable quality can be obtained.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Modes for Carrying Out the Invention

[0013] Next, a resin supply apparatus according to the present invention will be described below with reference to the accompanying drawings by way of preferred embodiments. It should be noted that the embodiments and drawings described below illustrate a part of the embodiments of the present invention, and are not used for the purpose of limiting to these configurations, and can be appropriately changed without departing from the gist of the present invention.

Embodiment

[0014] As shown in FIG. 1, a resin supply apparatus 10 according to an embodiment supplies a resin generated by mixing a plurality of types of liquid materials (such as a first liquid, a second liquid, and a third liquid described later) to a cavity 100a of a mold 100. The resin supply apparatus 10 is disposed by inserting a tip portion of a mixing head 12 into an insertion portion 102 formed in the mold 100, and supplies the resin from a discharge port 12a that opens to the tip surface of the mixing head 12 to the cavity 100a. Here, since the mixing head 12 is in contact with the mold 100, heat is transferred from the mold 100 heated to a predetermined temperature to the mixing head 12, and the mixing head 12 is warmed. Note that the example in FIG. 1 is a two-layer molding. After molding the first-layer molded product 106 by injection molding or the like, the mold 100 is opened by a predetermined amount to form the cavity 100a, and the second-layer resin layer 108 is formed on the first-layer molded product 106 by the resin supply apparatus 10 to form a multi-layer molded product 104.

[0015] The resin supply device 10 includes a mixing head 12 having a mixing chamber 14 (see FIG. 2) for mixing a first liquid and a second liquid, and a metering pump 50 for supplying a third liquid to the mixing chamber 14. The mixing head 12 is connected to a first delivery pipe 18 for sending the first liquid from a first tank 16 storing the first liquid, a first return pipe 20 for returning the first liquid from the mixing head 12 to the first tank 16, a second delivery pipe 24 for sending the second liquid from a second tank 22 storing the second liquid, and a second return pipe 26 for returning the second liquid from the mixing head 12 to the second tank 22. Although not shown, known pumps are arranged in each of the first tank 16 and the second tank 22, and by operating the pumps, a predetermined amount of the first liquid and the second liquid are supplied from the first tank 16 and the second tank 22 to the mixing head 12. Further, the metering pump 50 is connected to a third delivery pipe 54 for sending the third liquid from a third tank 52 storing the third liquid, and by operating the metering pump 50, the third liquid is supplied from the third tank 52 to the metering pump 50.

[0016] The first liquid and the second liquid are reactive resin components that form a resin that cures by mixing. Examples of the combination of the first liquid and the second liquid include combinations such as a polyol and an isocyanate that produce polyurethane, bisphenol A and epichlorohydrin that produce an epoxy resin, and a combination of ε-caprolactam with a catalyst added and ε-caprolactam with an activator added that produce polyamide (nylon 6), and other known resin components.

[0017] Examples of the third liquid include additives that impart appearance properties such as color and mechanical properties such as hardness to the resin produced from the first liquid and the second liquid. Further, the third liquid is a component with a smaller addition amount compared to the first liquid and the second liquid. Specifically, examples of the third liquid include those containing a colorant that colors the resin. The third liquid in the examples is a dispersion of a colorant such as a pigment in either the first liquid or the second liquid, and is a material that does not cure alone. In the multi-layer molded product 104 of the examples, the resin layer 108 is colored by the colorant.

[0018] As shown in FIGS. 2 and 3, the mixing head 12 includes a mixing chamber 14 for mixing a first liquid, a second liquid, and a third liquid, an injection part 28 communicating with the mixing chamber 14, a switching piston 30, and an operating cylinder part 32 for operating the switching piston 30. The mixing chamber 14 is connected to the discharge port 12a of the mixing head 12. The outer shell of the mixing head 12 is formed of a metal such as iron.

[0019] As shown in FIGS. 4 and 5, the mixing chamber 14 includes a first supply port 34 for supplying the first liquid, a second supply port 36 for supplying the second liquid, and an injection port 28a of the injection part 28 through which the third liquid passes. Here, the first supply port 34 is an orifice for injecting the first liquid supplied to the mixing head 12 through the first delivery pipe 18 into the mixing chamber 14 at high pressure and high speed. The second supply port 36 is an orifice for injecting the second liquid supplied to the mixing head 12 through the second delivery pipe 24 into the mixing chamber 14 at high pressure and high speed. In the mixing chamber 14, the first supply port 34 for supplying the first liquid and the second supply port 36 for supplying the second liquid are arranged opposite to each other (not limited to 180°), and the first liquid supplied from the first supply port 34 to the mixing chamber 14 and the second liquid supplied from the second supply port 36 to the mixing chamber 14 are countercurrently mixed. In the embodiment, the injection port 28a of the injection part 28 is arranged on a virtual plane V connecting the first supply port 34 and the second supply port 36 (see FIG. 5(a)). The injection port 28a, the first supply port 34, and the second supply port 36 are not limited to the above-described positional relationship, and the injection port 28a may be arranged above the virtual plane V connecting the first supply port 34 and the second supply port 36, that is, on the side opposite to the discharge port 12a of the mixing head 12 (see FIG. 5(b)).

[0020] As shown in FIG. 5, the mixing chamber 14 includes a first circulation port 40 for circulating the first liquid to the first tank 16 and a second circulation port 42 for circulating the second liquid to the second tank 22. In the mixing chamber 14, the first circulation port 40 and the second circulation port 42 are arranged above the first supply port 34 and the second supply port 36, that is, on the side opposite to the discharge port 12a.

[0021] As shown in FIG. 6, the injection part 28 is provided on the side wall forming the mixing chamber 14 in the mixing head 12. The injection part 28 of the embodiment is formed in a concave shape opening to the outside, and an injection port 28a is provided at the bottom of the injection part 28.

[0022] As shown in FIGS. 2 and 3, the switching piston 30 includes a rod part 30a for opening and closing the mixing chamber 14, a piston part 30b disposed in the operating cylinder part 32, and a groove part 30c formed in the rod part 30a. The piston part 30b moves forward and backward in the operating cylinder part 32 by the operating fluid such as oil or air supplied from the operating fluid supply part 33 to the operating cylinder part 32, so that the rod part 30a connected to the piston part 30b moves the mixing chamber 14. When the rod part 30a is disposed at the supply position away from the discharge port 12a, the rod part 30a is disengaged from the injection port 28a, the first supply port 34, and the second supply port 36. As a result, the mixing chamber 14 is connected to the discharge port 12a, and the resin generated by mixing the first liquid, the second liquid, and the third liquid can be discharged from the discharge port 12a (see FIG. 2). When the rod part 30a is disposed at the circulation position approaching the discharge port 12a, the injection port 28a and the discharge port 12a are blocked by the rod part 30a (see FIG. 3). Further, the first supply port 34 and the first circulation port 40 are connected by the groove part 30c, so that the first liquid can be circulated between the first tank 16 and the mixing head 12. Similarly, the second supply port 36 and the second circulation port 42 are connected by the groove part 30c, so that the second liquid can be circulated between the second tank 22 and the mixing head 12. Therefore, when the rod part 30a is at the circulation position, the mixing of the first liquid and the second liquid is not performed.

[0023] The metering pump 50 is a pump capable of supplying a third liquid in an amount smaller than the first liquid and the second liquid. As shown in FIGS. 2 and 3, the metering pump 50 includes a delivery part 56 for delivering the third liquid to the mixing chamber 14, a cylinder 58 for delivering the third liquid to the delivery part 56, and a supply part 60 for supplying the third liquid to the cylinder 58. The outer shell of the metering pump 50 of the embodiment is formed of a metal material such as iron.

[0024] The delivery section 56 is the part that serves as the discharge port of the third liquid in the metering pump 50. Here, the delivery section 56 is in contact with and connected to the injection section 28 of the mixing head 12. That is, there is no piping such as a hose separate from the metering pump 50 arranged between the delivery section 56 of the metering pump 50 and the injection section 28 of the mixing head 12, and the metering pump 50 and the mixing head 12 are connected without a hose.

[0025] As shown in FIG. 6, the tip of the delivery section 56 where the outlet 56a of the third liquid is formed protrudes beyond the side surface of the cylinder 58 that is arranged in contact with the side surface of the mixing head 12. When the metering pump 50 is attached to the mixing head 12, the tip of the delivery section 56 fits into the injection section 28 formed in a concave shape on the side wall of the mixing head 12, and the outlet 56a of the delivery section 56 is arranged to face the injection port 28a of the injection section 28 (see FIG. 4). In the embodiment, in a state where the convex tip of the delivery section 56 fits into the concave injection section 28 and they are in contact with each other, the outlet 56a of the delivery section 56 and the injection port 28a that opens into the mixing chamber 14 are connected.

[0026] As shown in FIG. 4, the delivery section 56 includes a delivery path 62 through which the third liquid passes, an opening / closing section 64 that opens and closes the outlet 56a, and a biasing section 66 that biases the opening / closing section 64 toward the outlet 56a side. The upstream side of the delivery path 62 is connected to a liquid chamber 68 (described later) of the cylinder 58, and the third liquid is sent out from the downstream outlet 56a. The opening / closing section 64 is arranged to be movable forward and backward in the delivery path 62. By moving forward toward the outlet 56a side, one end on the outlet 56a side closes the outlet 56a, and by moving backward away from the outlet 56a, the outlet 56a is opened. The biasing section 66 is arranged on the side of the delivery section 56 opposite to the outlet 56a and pushes the other end of the opening / closing section 64 toward the outlet 56a side. Note that an elastic member such as a spring is used as the biasing section 66.

[0027] When the third liquid is supplied from the liquid chamber 68 of the cylinder 58 to the delivery path 62 in the delivery unit 56, the opening / closing unit 64 moves away from the outlet 56a against the biasing force of the biasing unit 66 due to the pressure of the third liquid, thereby opening the outlet 56a (see FIG. 8). When the third liquid is not being supplied from the liquid chamber 68 of the cylinder 58 to the delivery path 62 in the delivery unit 56, the opening / closing unit 64 is biased by the biasing unit 66 and moves forward to close the outlet 56a (see FIG. 7).

[0028] The cylinder 58 includes a liquid chamber 68 for storing the third liquid supplied from the supply unit 60, a piston 70 for sucking the third liquid into the liquid chamber 68 or sending it out from the liquid chamber 68 to the delivery unit 56, and a piston operating unit 72 for operating the piston 70. The piston 70 includes a head portion 70a disposed in the liquid chamber 68 and an operating portion 70b disposed in the piston operating unit 72. The operating portion 70b moves forward and backward within the piston operating unit 72 by the operating fluid such as oil or air supplied from the operating fluid applying unit 74 (see FIG. 2) to the piston operating unit 72, so that the head portion 70a connected to the operating portion 70b moves within the liquid chamber 68. The cylinder 58 performs a suction operation in which the head portion 70a moves backward in a direction to increase the volume of the liquid chamber 68, thereby sucking the third liquid into the liquid chamber 68 from the third tank 52 via the third delivery pipe 54 and the supply unit 60 (see FIG. 7). The cylinder 58 performs a supply operation in which the head portion 70a moves forward in a direction to decrease the volume of the liquid chamber 68, thereby sending out the third liquid from the liquid chamber 68 to the delivery unit 56 (see FIG. 8).

[0029] In the metering pump 50, the supply unit 60 is a port for receiving the third liquid. The upstream side of the supply unit 60 is connected to the third delivery pipe 54. Also, the downstream side of the supply unit 60 is connected to the liquid chamber 68 of the cylinder 58. The supply unit 60 includes a check valve 76 for preventing the backflow of the third liquid toward the third tank 52. The check valve 76 allows the flow of the third liquid from the supply unit 60 to the cylinder 58 during the supply of the third liquid from the supply unit 60 to the cylinder 58 (during the suction operation of the cylinder 58) (see FIG. 7). The check valve 76 prevents the backflow of the third liquid from the cylinder 58 to the supply unit 60 during the sending out of the third liquid from the cylinder 58 to the delivery unit 56 (during the supply operation of the cylinder 58) (see FIG. 8).

[0030] As shown in FIG. 6, the metering pump 50 is detachably attached to the mixing head 12. The metering pump 50 is not particularly limited as long as it can be detached from the outside. For example, it is fixed to the mixing head 12 by fastening means such as screws and bolts. Further, the metering pump 50 of the embodiment is a unit in which the delivery part 56, the cylinder 58, and the supply part 60 are integrated. When the metering pump 50 is detached, these parts can be handled together. The metering pump 50 is attached by bringing the side surface of the cylinder 58 into contact with the side surface of the mixing head 12.

[0031] The supply of resin from the resin supply device 10 to the mold 100 will be described. In the metering pump 50, the third liquid is sucked into the liquid chamber 68 from the first tank 16 by operating the cylinder 58 for suction (see FIG. 7). As a result, the third liquid is stored in the liquid chamber 68, and the third liquid can be supplied from the metering pump 50. When the third liquid is sucked, since the third liquid is not supplied from the liquid chamber 68 to the delivery path 62 of the delivery part 56, the outlet 56a of the delivery part 56 is blocked by the opening and closing part 64 pushed by the biasing part 66, and the third liquid is not supplied to the mixing chamber 14. Further, in the mixing head 12, the switching piston 30 is switched to the supply position to open the injection port 28a and the discharge port 12a (see FIG. 2).

[0032] When the supply of the first liquid to the mixing chamber 14 from the first supply port 34 is started, the supply of the second liquid to the mixing chamber 14 from the second supply port 36 is also started. Further, in the metering pump 50, by operating the supply of the cylinder 58, the third liquid stored in the liquid chamber 68 is sent out from the liquid chamber 68 to the delivery path 62 of the delivery section 56 (see FIG. 8). At this time, since the flow of the third liquid from the liquid chamber 68 to the supply section 60 is regulated by the check valve 76 provided in the supply section 60, the third liquid is sent out only from the liquid chamber 68 toward the delivery section 56. Also, when the third liquid is supplied, since the third liquid is supplied from the liquid chamber 68 to the delivery path 62 of the delivery section 56, the opening / closing section 64 retreats due to the pressure of the third liquid, and the outlet 56a of the delivery section 56 is opened. As a result, the outlet 56a of the delivery section 56 and the injection port 28a of the mixing head 12 communicate with each other, and the third liquid is supplied from the injection port 28a to the mixing chamber 14.

[0033] The third liquid supplied to the mixing chamber 14 is supplied toward the first liquid and the second liquid that are countercurrently mixed in the mixing chamber 14 and is mixed with these liquids, and the generated resin is supplied from the discharge port 12a of this mixing head 12 to the cavity 100a of the mold 100. Then, by curing the resin and molding it by laminating it on the molded product 106, a multilayer molded product 104 coated with the resin layer 108 is obtained. By stopping the supply operation of the cylinder 58, the outlet 56a of the delivery section 56 is closed by the opening / closing section 64 pushed by the biasing section 66 (see FIG. 9).

[0034] As described above, in the resin supply device 10, the delivery part 56 that delivers the third liquid in the metering pump 50 is in contact with and connected to the injection part 28 that communicates with the mixing chamber 14 in the mixing head 12. In this way, by not interposing a hose between the metering pump 50 and the mixing head 12, it is possible to prevent a change in the supply amount of the third liquid caused by the expansion and contraction of the hose due to the external environment such as the pressure and temperature change of the flowing third liquid. That is, according to the resin supply device 10, since the delivery part 56 of the metering pump 50 and the injection part 28 of the mixing head 12 are in contact, a predetermined amount of the third liquid can be accurately supplied to the mixing chamber 14. Therefore, variations in the component ratio of the third liquid with respect to the first liquid and the second liquid can be suppressed, and the resin obtained by mixing a plurality of liquids can be produced with stable quality. For example, when the third liquid contains a colorant as in the embodiment, variations in the color of the resin layer 108 between the multilayer molded products 104 can be suppressed, and color unevenness within the resin layer 108 in the single multilayer molded product 104 can be suppressed. In particular, when the supply amount of the third liquid is smaller than other components such as the first liquid and the second liquid, variations in the supply amount of the third liquid have a great adverse effect. However, as described above, according to the resin supply device 10, since the supply amount of the third liquid to the mixing chamber 14 can be stabilized, it greatly contributes to the quality stability of the resin.

[0035] As described above, the metering pump 50 includes a cylinder 58 that delivers the third liquid to the delivery section 56, a supply section 60 that supplies the third liquid to the cylinder 58, and a check valve 76 that prevents the backflow of the third liquid to the supply section 60 when the cylinder 58 delivers the liquid. When the cylinder 58 delivers the third liquid by the reciprocating movement of the piston 70 as in the embodiment, the third liquid corresponding to the volume of the liquid chamber 68 reduced by the forward movement of the head portion 70a of the piston 70 disposed in the liquid chamber 68 can be accurately delivered. Further, when the cylinder 58 delivers the third liquid by the reciprocating movement of the piston 70 as in the embodiment, the third liquid corresponding to the volume of the liquid chamber 68 enlarged by the backward movement of the head portion 70a of the piston 70 disposed in the liquid chamber 68 can be accurately taken into the liquid chamber 68. When the metering pump 50 has the cylinder 58 as in the embodiment, the supply amount of the third liquid can be made more stable. Further, since the check valve 76 prevents the backflow of the third liquid to the supply section 60 when the third liquid is delivered from the cylinder 58, the third liquid can be stably supplied only from the cylinder 58 to the delivery section 56.

[0036] In the resin supply apparatus 10, the side surface of the cylinder 58 is in contact with the mixing head 12, and the metering pump 50 is attached to the mixing head 12. Thus, since the cylinder 58 is in contact with the mixing head 12, when the mixing head 12 is heated by the molding die 100 as in the embodiment, the cylinder 58 can be heated via the mixing head 12. Thereby, the third liquid without a temperature difference can be smoothly mixed in the mixing chamber 14.

[0037] In the mixing chamber 14 of the resin supply apparatus 10, the injection port 28a of the injection section 28 may be disposed on a virtual plane V connecting the first supply port 34 and the second supply port 36 disposed opposite to each other or on the side opposite to the discharge port 12a with respect to the virtual plane V. By doing so, the third liquid supplied from the injection port 28a to the mixing chamber 14 can be efficiently mixed by riding on the turbulent flow generated by the collision with the first liquid and the second liquid. Therefore, according to the resin supply apparatus 10, the resin obtained by mixing a plurality of liquids can be produced with stable quality.

[0038] The metering pump 50 is detachably attached to the mixing head 12. Thereby, the metering pump 50 can be removed from the mixing head 12 for maintenance or easily replaced with another metering pump 50. Here, another metering pump 50 means, for example, when the third liquid contains a coloring agent as in the embodiment, the color of the coloring agent is different. For example, after supplying the third liquid containing a red coloring agent with the first metering pump 50, the first metering pump 50 is removed and replaced with the second metering pump 50, and the third liquid containing a blue coloring agent is supplied with the second metering pump 50, then the color can be easily changed. In this way, since the metering pump 50 can be exchanged for each one, the labor of cleaning can be saved when changing the third liquid.

[0039] The metering pump 50 is attached to the mixing head 12 by fitting the tip portion where the outlet 56a of the third liquid is provided in the delivery portion 56 into the injection portion 28 formed in a concave shape on the wall surrounding the mixing chamber 14 in the mixing head 12. Thereby, the delivery portion 56 of the metering pump 50 and the injection portion 28 of the mixing head 12 can be positioned.

[0040] (Modification example) Not limited to the above-described matters, for example, the following may be adopted. The present invention is not limited only to the specific descriptions of the embodiments and the following modification examples. (1) The metering pump in the embodiment is exemplified by a reciprocating pump that sends out liquid by the reciprocating movement of a piston, but is not limited thereto. For example, a diaphragm pump or a rotary pump that sends out liquid by the rotation of blades or a rotor may be used. (2) In the embodiment, two-layer molding is exemplified, but is not limited thereto. A single-layer molded product may be manufactured with the resin supplied from the resin supply device. (3) In the examples, two-layer molding was exemplified, but the present invention is not limited thereto, and molded articles having three or more layers may also be used. For example, with respect to the first layer base material, the second layer is molded as a colored layer of the first liquid, the second liquid, and the third liquid. Further, the molding die is opened by a predetermined amount again as it is, and the third liquid of the coloring component is not injected, and only the first liquid and the second liquid are injected to produce a molded article of three-layer molding having the third layer as a clear layer.

Explanation of Signs

[0041] 10 resin supply device, 12 mixing head, 12a discharge port, 14 mixing chamber, 28 injection part, 28a injection port, 34 first supply port, 36 second supply port, 50 metering pump, 56 delivery part, 58 cylinder, 60 supply part, 76 check valve

Claims

1. A mixing head having a mixing chamber for mixing a first liquid and a second liquid, and a metering pump for supplying a third liquid to the mixing chamber, wherein the metering pump is a pump capable of supplying a smaller amount of the third liquid than the first liquid and the second liquid, and a resin supply device, wherein a delivery part for delivering the third liquid in the metering pump abuts and is connected to an injection part communicating with the mixing chamber in the mixing head.

2. The first liquid and the second liquid form a resin that is mixed and cured, and the resin supply device according to claim 1, wherein the third liquid contains a colorant for coloring the resin.

3. The metering pump includes a cylinder for delivering the third liquid to the delivery part, and a check valve provided in a supply part for supplying the third liquid to the cylinder, the check valve preventing backflow of the third liquid to the supply part when the cylinder delivers the liquid, and the resin supply device according to claim 1, wherein a side surface of the cylinder contacts the mixing head and is attached to the mixing head.

4. The mixing chamber is connected to a discharge port of the mixing head, in the mixing chamber, a first supply port for supplying the first liquid and a second supply port for supplying the second liquid are arranged opposite to each other, and the injection port of the injection part is arranged on a virtual plane connecting the first supply port and the second supply port or on the side opposite to the discharge port with respect to the virtual plane. The resin supply device according to claim 1.

5. The resin supply device according to claim 1, wherein the metering pump is detachably attached to the mixing head.

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