Flow channel forming member and method for manufacturing a flow channel forming member

Abstract

To increase the options for molding machines. [Solution] The method for manufacturing a flow channel forming member includes a step of pouring molten resin around the contact portion between a first component and a second component, in which the molten resin forms a joint portion and a thickened portion, the joint portion contacts the first component and the second component, the thickened portion contacts only one of the first component and the second component, or does not contact either the first component or the second component, and the volume of the thickened portion is 50% or more of the volume of the joint portion.

Description

[Technical Field]

[0001] This disclosure relates to a channel forming member and a method for manufacturing a channel forming member. [Background technology]

[0002] Liquid ejection heads are known for ejecting liquids such as ink onto a recording medium. One example of a liquid ejection head is an inkjet recording head, which can eject liquids such as ink supplied from a liquid container such as an ink tank from multiple ejection ports. Liquid ejection heads capable of ejecting multiple types of ink are equipped with a flow channel forming member, which has multiple liquid supply channels corresponding to each ink. Generally, such flow channel supply members with liquid supply channels are composed of a combination of multiple parts injection-molded from resin material, from the viewpoint of ease of manufacture, lightness, and corrosion resistance. For example, multiple parts are individually injection-molded, and then these parts are assembled by ultrasonic welding or adhesive bonding.

[0003] In recent years, a technology has emerged to simplify this manufacturing method, which involves simultaneously molding multiple parts within a mold and completing the assembly. Patent Document 1 describes a manufacturing method using die slide injection (hereinafter referred to as DSI) molding, which enables injection molding of multiple parts and joining of those parts within the same mold. Patent Document 2 describes a manufacturing method using die rotary injection (hereinafter referred to as DRI) molding, which enables injection molding of multiple parts and joining of those parts within the same mold. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2001-347536 [Patent Document 2] Japanese Patent Publication No. 2019-142013 [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] In manufacturing methods that involve molding and assembling multiple resin molded parts within the same mold, there is a need to increase the range of available molding machines. [Means for solving the problem]

[0006] A manufacturing method according to one aspect of the present disclosure is a method for manufacturing a flow channel forming member in which a fluid flow channel is formed between a first component and a second component, comprising: a first step of injection molding the first component at a first position between a pair of molds and injection molding the second component at a second position between the pair of molds; a second step of opening the pair of molds so that the first component remains in one of the pair of molds and the second component remains in the other of the pair of molds, and then moving the pair of molds relative to each other so that the first component and the second component face each other; and the first component and the second The method includes a third step of closing the pair of molds so that they come into contact with the two components, and a fourth step of pouring molten resin around the contact portion between the first component and the second component, wherein in the fourth step, the molten resin forms a joint and a thickened portion, the joint comes into contact with the first component and the second component, the thickened portion comes into contact with only one of the first component and the second component, or does not come into contact with either the first component or the second component, and the volume of the thickened portion is 50% or more of the volume of the joint. [Effects of the Invention]

[0007] This disclosure can increase the range of options for molding machines. [Brief explanation of the drawing]

[0008] [Figure 1] This is a perspective view of a recording head equipped with a flow channel forming member. [Figure 2] This figure shows an example of a manufacturing method for joint components. [Figure 3] It is a schematic cross-sectional view for explaining the operation of the mold and the molded part. [Figure 4] It is a schematic cross-sectional view for explaining the operation of the mold and the molded part. [Figure 5] It is a schematic cross-sectional view for explaining the operation of the mold and the molded part. [Figure 6] It is a schematic cross-sectional view for explaining the operation of the mold and the molded part. [Figure 7] It is a schematic cross-sectional view for explaining the operation of the mold and the molded part. [Figure 8] It is a schematic cross-sectional view for explaining the operation of the mold and the molded part. [Figure 9] It is a schematic cross-sectional view for explaining the operation of the mold and the molded part. [Figure 10] It is a schematic cross-sectional view for explaining the operation of the mold and the molded part. [Figure 11] It is a perspective view and an exploded perspective view of the joint member. [Figure 12] It is a perspective view and an exploded perspective view of the joint member. [Figure 13] It is a perspective view of the joint member. [Figure 14] It is a view showing the joint member as a comparative example. [Figure 15] It is a perspective view and an exploded perspective view of the joint member. [Figure 16] It is a perspective view and an exploded perspective view of the joint member. [Figure 17] It is a view showing an example of the bonding resin. [Figure 18] It is a perspective view and an exploded perspective view of the joint member. [Figure 19] It is a perspective view and an exploded perspective view of the joint member.

Embodiments for Carrying Out the Invention

[0009] Preferred embodiments of this disclosure will be described in detail below with reference to the attached drawings. Note that the following embodiments are not limiting to the scope of this disclosure, and not all combinations of features described in the following embodiments are essential to the solutions of this disclosure. The same reference numerals are used for identical components.

[0010] <<First Embodiment>> <Overview> Prior to describing this embodiment, DSI molding and DRI molding, which allow for injection molding of multiple parts and joining of those parts within the same mold, will be described as methods for manufacturing hollow bodies having a hollow section inside, as mentioned above. DSI molding involves sliding the mold, while DRI molding involves rotating the mold.

[0011] In this manufacturing method, two parts constituting a hollow body are simultaneously molded at different positions within a pair of molds (a fixed mold and a movable mold) (primary molding), and then the molds are opened. These two parts are, for example, a first part having an opening and a second part of a size and shape that covers that opening. When opening the molds, one of the two parts is left in the fixed mold and the other in the movable mold. Next, one or both of the molds are moved so that the part remaining in the fixed mold and the other part remaining in the movable mold face each other, and then the molds are closed. At this point, the two parts are in contact and form a hollow body, but they are not joined. Subsequently, molten joining resin (also called molten resin) is poured around the contact area (secondary molding) to bond the parts and form a hollow body. One of the advantages of this manufacturing method is that by molding and joining multiple parts within the same mold, the joining accuracy of multiple parts can be reduced to approximately the size of a single part. Furthermore, by using this manufacturing method, even flow path forming components for liquid discharge heads can be molded and assembled within the same mold.

[0012] In this manufacturing method, the required volume of bonding resin to seal the joint is generally small compared to the volume of the primary molded part, which makes up the majority of the part's shape. However, injection molding machines have recommended injection volume values ​​for stable molding, and if the volume difference between the primary molded part and the bonding resin is large, or if the volume of the bonding resin is small, it may not fall within the recommended range. The molds used in this manufacturing method tend to be larger and heavier than normal molding molds (= towards larger molding machines), while components such as inkjet recording heads and other liquid ejection heads are often small. For this reason, components mounted on liquid ejection heads tend to fall below the lower limit of the recommended injection volume for the molding machine. On the other hand, simply increasing the injection volume of bonding resin consumes resin that is unnecessary in terms of the part's function, and results in disadvantages such as an increase in part size and weight, as well as the addition of post-processing steps to remove excess material molded outside the part. Another factor contributing to these problems is that many molding factories don't procure new molding machines for each product, but rather use existing machines and simply swap out the molds. This problem also arises when multiple injection units are attached to a single mold.

[0013] The embodiments described below describe a channel-forming member and a method for manufacturing the same that can increase the volume of the bonding resin and reduce the volume difference with the primary molded part. Furthermore, an example is described in which this can increase the range of molding machine options. The channel-forming member described below is an example of an application as a liquid supply member provided in an inkjet recording head, which is an example of a liquid ejection head.

[0014] Figure 1 is a perspective view of the recording head 1 equipped with a flow path forming member (liquid supply member) in this embodiment. Figures 1(a) and 1(b) are perspective views of the recording head 1 from different directions. The recording head 1 in this embodiment is mounted on the carriage of a so-called serial scan type inkjet recording device (liquid ejection device). The recording head 1 may also be mounted on a so-called full-line type inkjet recording device.

[0015] The recording head 1 includes a housing member 2, a recording element unit 3, an electrical connection board 4, a sub-tank unit 5, and a joint member 6. In this embodiment, the flow path forming member corresponds to the joint member 6.

[0016] Ink (liquid) is supplied from an ink tank (liquid container) (not shown) to the sub-tank unit 5 through a main-side ink connection needle 61 provided on the joint member 6. The sub-tank unit 5, housing member 2, and recording element unit 3 are fluidically connected, forming a circulating ink flow path. The recording element unit 3 has multiple ejection ports capable of ejecting ink, arranged to form an ejection port row (not shown). Each ejection port is equipped with an ejection energy generating element such as an electrothermal conversion element (heater) or a piezoelectric element. In the recording head 1 of this example, four colors of ink are supplied, and the four colors of ink are ejected from corresponding ejection port rows.

[0017] The device's main unit (not shown) controls the ejection energy generating element through the electrical connection board 4, causing ink to be ejected from the ejection port corresponding to the driven ejection energy generating element. Furthermore, the inkjet recording device of this embodiment is equipped with a degassing system to periodically remove gas from inside the liquid chamber of the sub-tank unit 5. The degassing channel is a channel that connects the sub-tank unit 5 and the pressure reduction mechanism (not shown) of the device's main unit via a main unit-side air connection needle 62 provided on the joint member 6.

[0018] As described above, the joint member 6 is equipped with a liquid channel and an air channel, but it is not limited to this example. The joint member 6 may be equipped with either a liquid channel or an air channel, or both. The liquid channel and the air channel are collectively referred to as the fluid channel.

[0019] Figure 2 shows an example of a manufacturing method (molding flow) for producing the joint member 6 in this embodiment. Figures 3 to 10 are schematic cross-sectional views illustrating the operation of the mold and the molded part. The manufacturing method for the joint member 6 will be explained using Figures 2 to 10. In the example shown in Figures 3 to 10, the die rotary injection (DRI) molding method described above is used as the manufacturing method. However, an example using die slide injection (DSI) molding may also be used.

[0020] Figure 3 is a schematic cross-sectional view showing the mold open state before molding. The manufacturing apparatus is equipped with a first gate valve 11, a second gate valve 12, and a third gate valve 13 as gate valves. The manufacturing apparatus is also equipped with a pair of molds, a fixed mold 14 and a movable mold 15. The difference in hatching on the fixed mold 14 in Figure 3 distinguishes between rotating and non-rotating parts, as will be described later. The vertical dotted line indicates the axis of rotation. The difference in hatching and the vertical dotted line on the movable mold 15 are similar (the same applies to Figures 4 to 10).

[0021] In the open state before molding, the gate valves 11, 12, 13, the fixed mold 14, and the movable mold 15 are separated. When the mold is closed from this state (S21), it becomes the state shown in Figure 4. In the state shown in Figure 4, the gate valves 11, 12, 13, the fixed mold 14, and the movable mold 15 come into contact, forming cavities 16 and 17 that shape the product. Subsequently, as shown in Figure 5, molten resin is filled from the gate valves 11 and 12, and primary molded parts A (18) and primary molded parts B (19) are molded (S22A, S22B). Note that cavity 16 corresponds to the first position between the pair of molds, and cavity 17 corresponds to the second position between the pair of molds. Although an example is shown in which the movable mold 15 moves relative to the fixed mold 14, it is sufficient for at least one mold to move relative to the other, and both may be configured to move.

[0022] After the primary molded parts are formed, the mold opens again as shown in Figure 6 (S23). At this time, in this example, the primary molded part B (19) formed in S22A and S22B is held in the fixed mold 14, and the primary molded part A (18) is held in the movable mold 15 when the mold opens.

[0023] Next, the fixed mold 14 and the movable mold 15 that hold the molded product rotate, and the mold moves to a position where the primary molded parts 18 and 19 are in the desired contact state (S24). Figure 7 shows the state after the mold has moved from the state in Figure 6. After the mold has moved, the mold is closed again (S25). Figure 8 shows the state after the mold has been closed after Figure 7. In the state in Figure 8, the primary molded parts 18 and 19 are in contact with each other, and the joining channel shape and hollow shape are formed. At the same time, the cavities 16 and 17 that form the shape of the primary molded parts are also formed again.

[0024] Next, as shown in Figure 9, molten resin is filled through gate valves 11, 12, and 13 to perform molding of primary molded parts (S26A and S26B) and joining molding (secondary molding) (S26C). The filling timing for molding from S26A to S26C may be simultaneous, or a specific filling sequence may be provided.

[0025] In this embodiment, the joint member 6 uses an injection device mounted on the injection molding machine body for primary molding and an external small injection device for secondary molding. This method employs two injection devices to perform primary and secondary molding simultaneously. By using two injection devices to perform primary and secondary molding simultaneously, even with DSI molding or DRI molding, the same molding conditions as for normal molding can be set for the secondary molded part without extending the molding time. Another advantage is that primary and secondary molding can be performed with different materials. In this example, the external small injection device is of the type that attaches to the mold, but it may also be of the type that attaches to the injection molding machine body.

[0026] Furthermore, as an alternative molding method, there is a method in which the timing of gate opening and closing is adjusted during a single molding machine operation. Specifically, this method involves simultaneously filling primary molded parts A(18) and B(19), closing the primary molding gate valve during the holding pressure process, and then opening the secondary molding gate valve 13 to fill the bonding resin 20. In other words, secondary molding is performed only during the holding pressure process of the molding machine. During the holding pressure process, filling is carried out while maintaining a constant pressure. This has the advantage of suppressing the problems specific to DSI molding and DRI molding, such as the inflow of secondary resin into hollow parts (ink channels, air channels, etc.) due to deformation of the primary molded parts (= collapse of the secondary resin path) caused by excessive injection pressure (resin leakage). However, since this is not a filling method that actively flows resin like the injection speed priority filling used in normal molding, filling takes time, and there is a risk that the molten resin may solidify. Thus, although each molding method has its advantages and disadvantages, the joint member 6 of this embodiment may be molded using any molding method.

[0027] In this embodiment, the joint member 6 uses the same filler-containing material for all primary molded parts A(18) and B(19), and the joining resin, but it is not a problem to manufacture it using multiple materials. However, it is desirable that the primary molded parts and the joining resin be made of compatible materials.

[0028] After joining is complete, the mold is opened again as shown in Figure 10 (S27). Then, as shown in Figure 10, the finished molded product (joint member 6) is removed (S28). After the molded product is removed, the state is the same as in Figure 6. Therefore, the molding cycle is repeated from Figure 6 to Figure 10 (S24 to S28).

[0029] Figures 11 and 12 are perspective views of the joint member 6 and exploded perspective views of the primary molded parts and joining resin, respectively. Figures 11 and 12 are diagrams from different viewpoints. For convenience, the viewpoint on Figure 11 will be referred to as the front viewpoint, and the viewpoint on Figure 12 will be referred to as the back viewpoint. The shapes of each component in the joint member 6 will be explained below using Figures 11 and 12. Primary molded part A (18) and primary molded part B (19) are both components of the joint member 6, which is a flow path forming member.

[0030] The primary molded part A(18) has positioning bosses 63 at both ends on its front side for connection with the main unit of the device. The main unit of the device is provided with positioning holes (not shown) that engage with these positioning bosses 63. The primary molded part A(18) also has four ink supply passages. Specifically, in the primary molded part A(18), a main-side ink connection needle 61 that connects to the main unit of the device and a sub-tank side ink connection needle 64 that connects to the sub-tank unit 5 pass straight through from the front to the back. The primary molded part A(18) also has four sub-tank side air connection needles 65 on its back side. The sub-tank side air connection needles 65 are configured to connect to the air passages in the sub-tank unit 5.

[0031] The primary molded part B(19) has one main body-side air connection needle 62 on its front side for connecting to the main unit of the device. The portion that will serve as the air passage is formed by carving into the back side of the primary molded part B(19). By covering this portion (flow channel groove) with the primary molded part A(18) and joining them by pouring molten resin around it (secondary molding), the air passage of the finished product (joint member 6) is formed. The four sub-tank-side air connection needles 65, the main body-side air connection needle 62, and the flow channel space created by secondary molding constitute an air passage that connects the sub-tank unit 5 and the main unit of the device. The primary molded part B(19) also has a cover 66 that serves to conceal the excess resin portion 68 of the joining resin, which will be described later.

[0032] Next, the shape of the bonding resin 20 (hereinafter also referred to as the bonding resin shape) will be described. The bonding resin shape is formed by filling the bonding resin channel formed by the primary molded parts A (18) and B (19) and the mold with molten resin. In this embodiment, for explanatory purposes, the region in the bonding resin shape that plays a role in bonding the primary molded parts A and B will be referred to as the bonding portion 67. In addition, the region in the bonding resin shape that absorbs variations in the amount of bonding resin 20 filled will be referred to as the excess material portion 68, and the region in the bonding resin shape that plays a role in increasing the volume will be referred to as the thickened material portion 69. In this embodiment, the bonding resin 20 is filled from the gate 70.

[0033] The joint 67 is formed to seal the area around the aforementioned air passage. Due to the characteristics of the joint, the joint 67 is in contact with both the primary molded parts A(18) and B(19).

[0034] Next, the excess material portion 68 will be explained. The excess material portion 68 is a part provided to absorb variations in the amount of bonding resin filled. If the amount of bonding resin is too much, it will deform the wall of the primary molded part, which forms the bonding resin channel with a strength weaker than that of the mold, causing resin leakage. When resin leakage occurs, the bonding resin may block the channel space, and the part may not be able to perform its function. On the other hand, if the amount of bonding resin is set too low, the required amount may not be filled, and a short circuit may occur at the joint. When the joint shorts, the channel and the outside become connected, and the part also fails to perform its function. For this reason, an appropriate amount of bonding resin is required, but there will be variations in the amount filled. For this reason, the excess material portion 68 is provided to absorb variations in the amount filled. The excess material portion 68 is provided in a place where it is filled after the necessary functional parts such as the joint portion 67 and the thickened portion 69, which will be described later, have been filled.

[0035] Furthermore, since the excess material portion 68 serves to absorb filling variations, it is uncertain how much of the space provided as the excess material portion will actually be filled with bonding resin. That is, some or all of the space provided as the excess material portion may be filled with bonding resin. If only a part of the excess material portion is filled with bonding resin, the excess material portion 68 may appear to be short-circuited in appearance. Patent document 1, mentioned above, describes a method for removing the excess material portion by post-processing. Furthermore, patent document 2 describes a method for integrally molding the excess material portion to the surface of the primary molded part in order to eliminate the need for such post-processing. In the joint member 6 of this embodiment, similar to patent document 2, a space (resin reservoir) for filling the excess material portion that does not require post-processing is formed by the primary molded parts A(18), B(19) and the mold.

[0036] Figure 13 is a perspective view of a joint member 6 having an excess material portion 68 in which the amount of bonding resin filling differs from that of the excess material portion 68 shown in Figure 12(a) due to filling variations. As shown in Figure 13, due to filling variations, an excess material portion 68 that appears to be short can be formed. In the recording head 1 of this embodiment, such an excess material portion 68 is hidden by the cover 66 of the primary molded part B(19) mentioned above, so that it is not visible to the user who will be using the product. As a result, at the time of completion of molding, the manufacturer can see the excess material portion 68 from the sub-tank unit 5 side (the back side corresponding to the viewpoint in Figures 12 and 13), but after head assembly, the excess material portion 68 is hidden inside the head and cannot be seen by the user.

[0037] Regarding the shape of the excess material portion 68, it is preferable to narrow the cross-sectional area of ​​the joining channel to momentarily delay the inflow (i.e., filling pressure is applied to the joining portion 67 and the thickened portion 69) so that the necessary functional parts are filled before the resin flows into the resin reservoir. In other words, it is preferable to provide a narrowed section with a reduced cross-sectional area of ​​the channel than upstream, and to form the excess material portion 68 downstream of the narrowed section. The narrowed section can also be said to be a connecting section that connects the excess material portion 68 and the thickened portion 69. Furthermore, after inflow into the resin reservoir, it is preferable to widen the cross-sectional area to prevent resin leakage due to pressure loss during filling into the excess material portion 68. In other words, it is preferable that the cross-sectional area of ​​the joining channel immediately after inflow into the resin reservoir is larger than the cross-sectional area of ​​the joining channel immediately before inflow into the resin reservoir. Therefore, the excess material portion 68 in this embodiment also corresponds to the region from the part where the cross-sectional area of ​​the joining resin channel is widened to the final filling portion of the joining resin. After passing through the narrowed section, the joining resin fills part or all of the resin reservoir, thereby forming the excess material portion 68.

[0038] Next, we will explain the thickened portion 69, which is one of the features of this embodiment. The thickened portion 69 is a region in the joining resin shape that does not correspond to the joining portion 67 or the excess portion 68. A characteristic of the thickened portion 69 is that it either contacts only one part of the primary molded part, or does not contact the primary molded part at all. That is, the joining channel of the thickened portion 69 is formed by the mold and one primary molded part, or by the mold alone. The thickened portion 69 is formed when joining resin is filled into such a joining channel. As shown in Figure 11, the thickened portion 69 of this embodiment has a shape that integrates with the primary molded part A(18) to form a single wall. That is, this wall is a wall in which a part of the surface of the thickened portion 69 formed by the mold and a part of the surface of the primary molded part A(18) form the same surface. This wall has the function of preventing leaked ink from dripping to unintended locations when inserting or removing the main body unit and the main body side ink connection needle 61 of the joint member 6, or when ink leaks irregularly from the ink flow path connection. As shown in Figure 11, this wall has an overhang shape. In principle, this wall could be formed using only the primary molded part A(18). However, in this embodiment, by forming a part of the wall with bonding resin, the insufficient volume of bonding resin mentioned at the beginning of this embodiment is resolved without increasing the volume of the part.

[0039] Thus, one of the features of this embodiment is that the shape of a functional primary molded part is replaced with a certain volume of bonding resin. Furthermore, by replacing the shape with bonding resin, the bonding interface with the primary molded part is made compatible, and by re-curing, a completely integrated shape can be achieved. In other words, it can be said that at least some of the surfaces of the primary molded part A(18) and the thickened part 69, excluding the interface, form the same surface. For this reason, it is possible to form a functional part (wall) with a strength comparable to that of a functional part (wall) composed only of primary molded parts. In this respect as well, bonding resin is suitable for shape replacement. For example, if primary molded parts are combined to form a single wall, gaps or steps will inevitably occur due to part tolerances or deformation.

[0040] This section explains the relationship between the volumes of each part in the jointed resin shape. If the volume of the jointed resin shape is, for example, more than 90% of the lower limit of the recommended injection capacity of the molding machine, production may proceed with that molding machine even if it lacks some molding stability. On the other hand, if the volume of the jointed resin shape is, for example, less than 70% of the lower limit of the recommended injection capacity of the molding machine, the degree of instability is so great that it may be considered difficult to mold with that molding machine. For these reasons, it is desirable that the volume of the thickened part 69 be 50% or more of the volume of the joint part 67, so as to increase the number of molding machine options for jointed resins with a joint part of about 60-70% of the lower limit of the recommended injection capacity of the molding machine. Furthermore, it is desirable that the excess part 68 occupies 10% or more of the total volume of the jointed resin so as to be able to absorb a filling amount variation of about ±5%. In this case, in practice, a variation of ±5% or more can be expected, including the resin compression after full filling.

[0041] Furthermore, the connection between the joint 67 and the thickened section 69 is located at the point where the molten resin filled from the gate 70 merges after branching. This allows for a balanced transmission of the filling pressure within the joining resin flow path, and also allows the resin from the weld section, which is disadvantageous in obtaining high joint strength, to be extruded into the thickened section 69, thereby further increasing the joint strength.

[0042] Figure 14 shows a joint member 106 as a comparative example, which does not follow this embodiment. Figure 14 is an exploded perspective view of the joint member from the front, similar to Figure 11(b). Figure 14 shows an example of the joint member shape when the bonding resin shape is limited to the minimum necessary bonding portion. In the case of the shape shown in Figure 14, the volume of the bonding resin 120 is approximately 250 mm³. 3 The volume of the primary molded part A(118) is approximately 7800 mm³. 3 The volume of the primary molded part B(119) is 1250 mm³. 3That is, in the joint member 106 of the comparative example shown in FIG. 14, the volume difference between the bonding resin and the primary molded part is large and open. In this case, it is difficult to select a molding machine that can mount a DSI / DRI mold that is likely to be enlarged and weighted by a die slide / die rotary mechanism while accommodating the volume of each part within the recommended injection capacity. In addition, there is a risk that it becomes difficult to guarantee stable production by molding a bonding resin with a small volume below the lower limit of the recommended injection capacity.

[0043] In contrast, as described in this embodiment, by making the shape of the bonding resin the shape shown in FIG. 11, the volume of each part is as follows. The volume of the bonding resin 20 is about 1200 mm 3 (joint part: 250 mm 3 , thickening part: 800 mm 3 , excess part: 150 mm 3 ). The volume of the primary molded part A (18) is 6850 mm 3 . The volume of the primary molded part B (19) is 1450 mm 3 . Thus, compared with the comparative example, the volume of the bonding resin can be increased and the volume difference between each part can be reduced. Thereby, the options for the molding machine to be used can be increased or the production stability can be enhanced.

[0044] Incidentally, the positioning boss 63 and the main body side ink connection needle 61 provided in the primary molded part A (18) and the main body side air connection needle 62 provided in the primary molded part B (19) are held by the separate parts A (18) and B (19) at the time of primary molding. However, in this embodiment, by performing DSI molding or DRI molding, the relative position accuracy can be maintained at a high accuracy comparable to that of the primary molded parts.

[0045] <<Second Embodiment>> In the second embodiment, a joint member, which is a flow channel forming member with a different shape from that of the first embodiment, is described. The basic configuration of the recording head and the manufacturing method (molding method) of the joint member are the same as in the example described in the first embodiment. The following will focus on the differences from the first embodiment. In this embodiment, an example is shown in which the amount of connecting resin filling corresponding to the thickened portion is smaller than in the first embodiment.

[0046] Figures 15 and 16 are perspective views of the joint member 26 in the second embodiment and exploded perspective views showing the primary molded part and the joining resin, respectively. Figures 15 and 16 are views from different perspectives. Figure 15 is a perspective view of the joint member 26 seen from the front, similar to Figure 11, and Figure 16 is a perspective view of the joint member 26 seen from the back, similar to Figure 12. The shapes of each component in the joint member 26 will be described below using Figures 15 and 16.

[0047] The primary molded part A(218) has positioning bosses 263 at both ends on its front side for connection with the main unit of the device. The main unit of the device is provided with positioning holes (not shown) that engage with these positioning bosses 263. The primary molded part A(218) also has four ink supply passages. Specifically, in the primary molded part A(218), the main unit side ink connection needle 261 that connects to the main unit of the device and the sub-tank side ink connection needle 264 that connects to the sub-tank unit 5 pass through in a straight line from the front to the back. The primary molded part A(218) also has four sub-tank side air connection needles 265 on its back side. The sub-tank side air connection needles 265 are configured to connect to the air passages in the sub-tank unit 5.

[0048] The primary molded part B(219) has one main body-side air connection needle 262 on its front side for connecting to the main unit of the device. The portion that will serve as the air passage is formed by carving into the back side of the primary molded part B(219). By bringing the primary molded part A(218) into contact with this portion (flow channel groove) to cover it and pouring molten resin around it to join them (secondary molding), the air passage of the finished product (joint member 26) is formed. The four sub-tank-side air connection needles 265, the main body-side air connection needle 262, and the flow channel space created by secondary molding constitute an air passage that connects the sub-tank unit 5 and the main unit of the device. The primary molded part B(219) also has a cover 266 that serves to conceal the excess resin portion 268 of the joining resin, which will be described later.

[0049] Next, the shape of the bonding resin 220 (bonding resin shape) will be described. The bonding resin shape is formed by filling the bonding resin channel formed by the primary molded parts A (218) and B (219) and the mold with molten resin. In this embodiment, for the purpose of explanation, the region in the bonding resin shape that plays a role in bonding the primary molded parts A and B will be referred to as the bonding portion 267. In addition, the region in the bonding resin shape that absorbs variations in the amount of bonding resin 220 filled will be referred to as the excess material portion 268, and the region in the bonding resin shape that plays a role in increasing the volume will be referred to as the thickened material portion 269. In this embodiment, the bonding resin 220 is filled from the gate 270.

[0050] The joint 267 is formed to seal the area around the aforementioned air passage. Due to the characteristics of the joint, the joint 267 is in contact with both primary molded parts A (218) and B (219).

[0051] Next, the excess material portion 268 will be described. The excess material portion 268 is a part provided to absorb variations in the amount of bonding resin filling. The role of the excess material portion 268 is the same as that of the excess material portion 68 described in the first embodiment, so the details will be omitted. The excess material portion 268 in this embodiment is also provided in a place that is filled after the bonding portion 267 and the additional material portion 269, which will be described later, have been filled.

[0052] Furthermore, since the excess material portion 268 also plays a role in absorbing filling variations, it is uncertain how much of the bonding resin will actually fill the space provided as the excess material portion. This means that the excess material portion 268 may appear to be short-circuited in appearance. In the joint member 26 of this embodiment, as in the example described in the first embodiment, the filling space (resin reservoir) of the excess material portion, which does not require post-processing, is formed by the primary molded parts A (218), B (219) and the mold.

[0053] In this embodiment as well, due to variations in filling, an excess material portion 268 that appears to be short-circuited may be formed. In the recording head 1 of this embodiment, since we do not want the user who will be using the product to see such an excess material portion 268, it is concealed by the cover 266 of the primary molded part B (219) mentioned above. As a result, at the time of completion of molding, the manufacturer can see the excess material portion 268 from the sub-tank unit 5 side (the back side corresponding to the viewpoint in Figure 16), but after the head is assembled, the excess material portion 268 is hidden inside the head and cannot be seen by the user.

[0054] The excess material portion 268 in this embodiment also corresponds to the region from the portion where the cross-sectional area of ​​the bonding resin flow path is enlarged to the final filling portion of the bonding resin.

[0055] Next, we will describe the thickened portion 269, which is one of the features of this embodiment. The thickened portion 269 of this embodiment is also an area in the joining resin shape that does not correspond to the joining portion 267 or the excess portion 268. A feature of the thickened portion 269 of this embodiment is that it comes into contact with only one part of the primary molded part. That is, the joining flow path of the thickened portion 269 is formed by the mold and one primary molded part. Specifically, the thickened portion 269 comes into contact only with the primary molded part A (218). As shown in Figure 15, the thickened portion 269 of this embodiment is shaped to form a single wall when integrated with the primary molded part A (218). This wall has the function of preventing leaked ink from dripping to unintended locations when the main body unit of the device and the main body side ink connection needle 261 of the joint member 26 are inserted or removed, or when ink leaks irregularly from the ink flow path connection. As shown in Figure 15, this integrated wall has an overhang shape. Ideally, this wall could be formed using only the primary molded part A(218). However, in this embodiment, by forming a portion of this wall with bonding resin, the shortage of bonding resin volume is resolved without increasing the volume of the part.

[0056] Thus, one of the features of this embodiment is that the shape of a functional primary molded part is replaced with a certain volume of bonding resin. Furthermore, by replacing the shape with bonding resin, the bonding interface with the primary molded part is made compatible, and by re-curing, a completely integrated shape can be created. For this reason, it is possible to form a functional part (wall) with a strength comparable to that of a functional part (wall) made only of primary molded parts. In this respect as well, bonding resin can be said to be suitable for shape replacement. For example, if primary molded parts are combined to make a single wall, gaps or steps will inevitably occur due to part tolerances or deformation.

[0057] The relationship between the volumes of each part in the joint resin shape will be explained. In this embodiment as well, as explained in the first embodiment, it is desirable that the volume of the thickened portion 269 be 50% or more of the volume of the joint portion 267. Furthermore, it is desirable that the excess portion 268 occupies 10% or more of the joint resin volume so that it can absorb a filling amount variation of about ±5%. In this case, in practice, it is possible to expect a variation tolerance of ±5% or more, including the resin compression after full filling.

[0058] Furthermore, the connection between the joint 267 and the thickened section 269 is located at the point where the molten resin filled from the gate 270 converges after branching. This allows for a balanced transmission of the filling pressure within the joining resin flow path, and also allows the resin from the weld section, which is disadvantageous in obtaining high joint strength, to be extruded into the thickened section 269, thereby further increasing the joint strength.

[0059] Figure 14, described in the first embodiment, shows a joint member 106 as a comparative example, which is not according to this embodiment. In this embodiment as well, Figure 14 is used as a comparative example. Figure 14 is an exploded perspective view of the joint member from the front, similar to Figure 15(b). Figure 14 shows an example of the shape of the joint member when the bonding resin shape is limited to the minimum necessary bonding portion. In the shape shown in Figure 14, the volume of the bonding resin 120 is approximately 250 mm³. 3 The volume of the primary molded part A(118) is approximately 7800 mm³. 3 The volume of the primary molded part B(119) is 1250 mm³. 3 That is the case.

[0060] In contrast, as described in this embodiment, by making the bonding resin shape as shown in Figure 15, the volume of each part is as follows: The volume of the bonding resin 220 is approximately 600 mm³. 3 (Joint part: 250mm 3 , Increased thickness: 200mm 3 , Excess portion: 150mm 3 The volume of the primary molded part A(218) is 7450 mm³. 3 The volume of the primary molded part B(219) is 1450 mm³. 3Thus, compared to the comparative example, the volume of the bonding resin can be increased by the thickened portion 269 and the excess portion 268, and the volume difference between each part can be reduced. This increases the range of molding machines that can be used and improves production stability.

[0061] Furthermore, the positioning boss 263 and body-side ink connection needle 261 on primary molded part A(218) and the body-side air connection needle 262 on primary molded part B(219) are possessed by separate parts A(218) and B(219) at the time of primary molding. However, in this embodiment, by performing DSI molding or DRI molding, the relative position accuracy can be maintained at the same high precision as that of primary molded parts.

[0062] <<Third Embodiment>> In the first and second embodiments, examples were described in which the shape of the bonding resin consists of a bonding portion, a reinforced portion, and an excess portion, in that order from the gate. Specifically, an example was described in which the gate of the bonding resin is provided at the bonding portion, a connecting portion is provided between the bonding portion and the reinforced portion, and a connecting portion is provided between the reinforced portion and the excess portion. In this embodiment, an example is described in which the shape of the bonding resin consists of a reinforced portion, a bonding portion, and an excess portion, in that order from the gate. Specifically, an example is described in which the gate of the bonding resin is provided at the reinforced portion, a connecting portion is provided between the reinforced portion and the bonding portion, and a connecting portion is provided between the bonding portion and the excess portion.

[0063] Figure 17 shows an example of the bonding resin 320 in this embodiment. In this embodiment, only the bonding resin 320 is shown for the sake of simplicity in explanation. The region that plays a role in bonding the primary molded parts A and B will be referred to as the bonding portion 367, the excess material portion 368 for absorbing variations in the amount of bonding resin filling, and the region that plays a role in increasing the volume will be referred to as the thickened material portion 369. In this embodiment, the bonding resin 320 is filled from the gate 370.

[0064] The joint portion 367 is a portion formed to seal the periphery of the air passage. The excess material portion 368 is a portion provided to absorb variations in the filling amount. As described in the first embodiment and others, the excess material portion 368 is provided in a location that is filled after the necessary functional parts such as the joint portion 367 and the thickened portion 369 have been filled. In this embodiment, the joining resin is first filled into the thickened portion 369 from the gate 370, and then the excess material portion 368 is shaped to branch off from where the joint portion 367 has been completely filled.

[0065] The thickened portion 369, similar to the example described in the first embodiment, is shaped to form a single wall when integrated with the primary molded part A. This shape addresses the issue of insufficient volume of bonding resin without increasing the volume of the part.

[0066] Furthermore, the connection between the joint portion 367 and the excess material portion 368 is located at the position where the molten resin filled from the gate 370 merges. This allows the filling pressure within the joining resin flow path to be transmitted in a balanced manner, and also allows the resin in the weld portion, which is disadvantageous in obtaining high joint strength, to be extruded into the excess material portion 368, thereby further increasing the joint strength.

[0067] <<Fourth Embodiment>> In the first to third embodiments, examples were described in which the thickened portion comes into contact with only one part of the primary molded part. In this embodiment, an example is described in which the thickened portion does not come into contact with the primary molded part.

[0068] Figures 18 and 19 are perspective views of the joint member 46 in the fourth embodiment and exploded perspective views of the primary molded part and the joining resin, respectively. Figures 18 and 19 are views from different perspectives. Figure 18 is a perspective view of the joint member 46 seen from the front, similar to Figure 11, and Figure 19 is a perspective view of the joint member 46 seen from the back, similar to Figure 12. The shapes of each component in the joint member 46 will be described below using Figures 18 and 19.

[0069] The primary molded part A(418) has positioning bosses 463 at both ends on its front side for connection with the main unit of the device. The main unit of the device is provided with positioning holes (not shown) that engage with these positioning bosses 463. The primary molded part A(418) also has four ink supply passages. Specifically, in the primary molded part A(418), the main unit side ink connection needle 461 that connects to the main unit of the device and the sub-tank side ink connection needle 464 that connects to the sub-tank unit 5 pass through in a straight line from the front to the back. The primary molded part A(418) also has four sub-tank side air connection needles 465 on its back side. The sub-tank side air connection needles 465 are configured to connect to the air passages in the sub-tank unit 5.

[0070] The primary molded part B (419) has one main body-side air connection needle 462 on its front side for connecting to the main unit of the device. The portion that will serve as the air passage is formed by carving into the back side of the primary molded part B (419). By covering this portion (flow channel groove) with the primary molded part A (418) and joining them by pouring molten resin around it (secondary molding), the air passage of the finished product (joint member 46) is formed. The four sub-tank-side air connection needles 465, the main body-side air connection needle 462, and the flow channel space created by secondary molding constitute an air passage that connects the sub-tank unit 5 and the main unit of the device. The primary molded part B (419) also has a cover 466 that serves to conceal the excess resin portion 468 of the joining resin, which will be described later.

[0071] Next, the shape of the bonding resin 420 (bonding resin shape) will be described. The bonding resin shape is formed by filling the bonding resin channel formed by the primary molded parts A (418) and B (419) and the mold with molten resin. In this embodiment, for the sake of explanation, the region in the bonding resin shape that plays a role in bonding the primary molded parts A and B will be referred to as the bonding portion 467. In addition, the region in the bonding resin shape that absorbs variations in the amount of bonding resin 420 filled will be referred to as the excess material portion 468, and the region in the bonding resin shape that plays a role in increasing the volume will be referred to as the thickened material portion 469. In this embodiment, the bonding resin 420 is filled from the gate 470.

[0072] The joint 467 is formed to seal the area around the aforementioned air passage. Due to the characteristics of the joint, the joint 467 is in contact with both primary molded parts A (418) and B (419).

[0073] Next, the excess material portion 468 will be described. The excess material portion 468 is a part provided to absorb variations in the amount of bonding resin filling. The role of the excess material portion 468 is the same as that of the excess material portion 68 described in the first embodiment, so the details will be omitted. The excess material portion 468 in this embodiment is also provided in a place that is filled after the bonding portion 467 and the additional material portion 469, which will be described later, have been filled.

[0074] Furthermore, since the excess material portion 468 also plays a role in absorbing filling variations, it is uncertain how much of the bonding resin will actually fill the space provided as the excess material portion. This means that the excess material portion 468 may appear to be short-circuited in appearance. In the joint member 46 of this embodiment, as in the example described in the first embodiment, the filling space (resin reservoir) of the excess material portion, which does not require post-processing, is formed by the primary molded parts A (418), B (419) and the mold.

[0075] In this embodiment as well, due to variations in filling, an excess material portion 468 that appears to be short-circuited may be formed. In the recording head 1 of this embodiment, since we do not want the user who will be using the product to see such an excess material portion 468, it is concealed by the cover 466 of the primary molded part B (419) mentioned above. As a result, at the time of completion of molding, the manufacturer can see the excess material portion 468 from the sub-tank unit 5 side (the back side corresponding to the viewpoint in Figure 19), but after the head is assembled, the excess material portion 468 is hidden inside the head and cannot be seen by the user.

[0076] The excess material portion 468 in this embodiment also corresponds to the region from the portion where the cross-sectional area of ​​the bonding resin flow path is enlarged to the final filling portion of the bonding resin.

[0077] Next, the thickened portion 469, which is one of the features of this embodiment, will be described. The thickened portion 469 of this embodiment is also a region in the joining resin shape that does not correspond to the joining portion 467 or the excess portion 468. A feature of the thickened portion 469 of this embodiment is that it does not come into contact with the primary molded part. That is, the joining flow path of the thickened portion 469 is formed by the mold alone. The wall formed by the thickened portion 469 has the function of preventing leaked ink from dripping to unintended locations when the main body unit of the device and the main body side ink connection needle 461 of the joint member 46 are inserted or removed, or when ink leaks irregularly from the ink flow path connection. As shown in Figure 18, the wall formed by this thickened portion 469 has an overhang shape. In principle, this wall could be formed by the primary molded part A (418) or the primary molded part B (419). However, in this embodiment, by forming this functional part (the canopy-shaped wall) with bonding resin, the shortage of bonding resin volume is resolved without increasing the volume of the component.

[0078] Thus, one of the features of this embodiment is that the shape of a functional primary molded part is replaced with a certain volume of bonding resin.

[0079] The relationship between the volumes of each part in the joint resin shape will be explained. In this embodiment as well, as explained in the first embodiment, it is desirable that the volume of the thickened portion 469 be 50% or more of the volume of the joint portion 467. Furthermore, it is desirable that the excess portion 468 occupies 10% or more of the joint resin volume so that it can absorb a filling amount variation of about ±5%. In this case, in practice, it is possible to expect a variation tolerance of ±5% or more, including the resin compression after full filling.

[0080] Furthermore, the connection between the joint 467 and the thickened section 469 is located at the point where the molten resin filled from the gate 470 converges after branching. This allows for a balanced transmission of the filling pressure within the joining resin flow path, and also allows the resin from the weld section, which is disadvantageous in obtaining high joint strength, to be extruded into the thickened section 469, thereby further increasing the joint strength.

[0081] Figure 14, described in the first embodiment, shows a joint member 106 as a comparative example, which is not according to this embodiment. In this embodiment as well, Figure 14 is used as a comparative example. Figure 14 is an exploded perspective view of the joint member from the front, similar to Figure 18(b). Figure 14 shows an example of the shape of the joint member when the bonding resin shape is limited to the minimum necessary bonding portion. In the shape shown in Figure 14, the volume of the bonding resin 120 is approximately 250 mm³. 3 The volume of the primary molded part A(118) is approximately 7800 mm³. 3 The volume of the primary molded part B(119) is 1250 mm³. 3 That is the case.

[0082] In contrast, as described in this embodiment, by making the bonding resin shape as shown in Figure 18, the volume of each part is as follows: The volume of bonding resin 420 is approximately 1500 mm³. 3 (Joint part: 250mm 3 , Increased thickness: 1100mm 3 , Excess portion: 150mm 3 The volume of the primary molded part A(418) is 6150 mm³. 3 The volume of the primary molded part B(419) is 1450 mm³. 3Thus, compared to the comparative example, the volume of the bonding resin can be increased by the thickened portion 469 and the excess portion 468, and the volume difference between each part can be reduced. This increases the range of molding machines that can be used and improves production stability.

[0083] Furthermore, the positioning boss 463 and body-side ink connection needle 461 on primary molded part A(418) and the body-side air connection needle 462 on primary molded part B(419) are possessed by separate parts A(418) and B(419) at the time of primary molding. However, in this embodiment, by performing DSI molding or DRI molding, the relative position accuracy can be maintained at the same high precision as that of primary molded parts.

[0084] <<Other Embodiments>> The embodiments described above are merely examples and are not limited to the example of molding liquid discharge head components as described above. The embodiments described above can be broadly applied to components that form hollow spaces by DRI molding or DSI molding. This disclosure includes the following examples of methods for manufacturing flow channel forming members and the configuration of flow channel members. <Configuration 1> A method for manufacturing a channel forming member in which a fluid channel is formed between a first component and a second component, A first step of injection molding the first component at a first position between the pair of molds and injection molding the second component at a second position between the pair of molds, A second step involves opening the pair of molds so that the first component remains in one of the molds and the second component remains in the other mold, and then moving the pair of molds relative to each other so that the first component and the second component face each other. A third step is to close the pair of molds so that the first component and the second component come into contact with each other, The process includes a fourth step of pouring molten resin around the contact area between the first component and the second component, In the fourth step described above, the molten resin forms a joint and a thickened portion. The joint portion abuts against the first component and the second component, The thickened portion may contact only one of the first component and the second component, or it may not contact either the first component or the second component. A method for manufacturing a flow channel forming member, characterized in that the volume of the thickened portion is 50% or more of the volume of the joint portion. <Configuration 2> In the third step, the mold and the first component form a joining channel through which the molten resin corresponding to the thickened portion flows. In the fourth step, the thickened portion is formed by filling the joining channel with the molten resin. A method for manufacturing a flow channel forming member according to configuration 1, wherein a portion of the thickened portion formed by the mold and a portion of the surface of the first component form the same surface. <Structure 3> In the third step, a resin reservoir is formed in the joining channel through which the molten resin flows by the first component, the second component, the mold, the first component and the mold, or the second component and the mold. In the fourth step, by filling the joining channel with the molten resin, an excess material is formed in part or all of the resin reservoir. A method for manufacturing a channel forming member according to configuration 1 or 2, wherein the cross-sectional area of ​​the joining channel immediately after inflow into the resin reservoir is larger than the cross-sectional area of ​​the joining channel immediately before inflow into the resin reservoir. <Structure 4> In the third step, the first component, the second component, the mold, the first component and the mold, or the second component and the mold, form a resin reservoir and a constricted portion in the joining channel through which the molten resin flows, with the channel cross-sectional area being smaller than that upstream. A method for manufacturing a flow channel forming member according to configuration 1 or 2, wherein in the fourth step, the molten resin passes through the constricted portion and then fills part or all of the resin reservoir portion, thereby forming an excess portion. <Composition 5> A method for manufacturing a flow channel forming member according to configuration 3 or configuration 4, wherein in the fourth step, the molten resin injected from the gate is filled in the joint, the thickened portion, and the excess portion in that order. <Composition 6> A method for manufacturing a flow channel forming member according to configuration 3 or configuration 4, wherein in the fourth step, the molten resin injected from the gate is filled in the thickened portion, the joint portion, and the excess portion in that order. <Composition 7> A method for manufacturing a flow channel forming member according to any one of the three to six components, wherein in the third step, the volume of the formed resin reservoir is 10% or more of the total volume of the molten resin. <Structure 8> A flow channel forming member having a first component, a second component, and a bonding resin shape formed by bonding resin in the space where the first component and the second component are in contact, wherein the first component, the second component, and the bonding resin shape are integrated, The first component and the second component form a fluid channel, The shape of the bonded resin is, A joint that contacts both the first component and the second component, A thickened portion that contacts only one of the first component and the second component, or does not contact either the first component or the second component, Includes, A flow channel forming member characterized in that the volume of the thickened portion is 50% or more of the volume of the joint portion. <Composition 9> The flow channel forming member according to configuration 8, characterized in that at least a portion of the surfaces other than the interface between the first component and the thickened portion form the same surface. <Composition 10> The flow channel forming member according to configuration 8 or 9, characterized in that the bonding resin shape includes an excess material portion that contacts the first component or the second component. <Composition 11> The flow channel forming member according to configuration 10, characterized in that the gate of the bonding resin is provided at the bonding portion, a connecting portion is provided between the bonding portion and the thickened portion, and a connecting portion is provided between the thickened portion and the excess portion. <Composition 12> The flow channel forming member according to configuration 10, characterized in that the gate of the bonding resin is provided in the thickened portion, a connecting portion is provided between the thickened portion and the bonding portion, and a connecting portion is provided between the bonding portion and the excess portion. <Composition 13> The flow path forming member according to configuration 11 or configuration 12, characterized in that the cross-sectional area of ​​the excess material portion is larger than the cross-sectional area of ​​the connection portion with the thickened material portion, or the cross-sectional area of ​​the connection portion with the joint portion. <Composition 14> The flow channel forming member according to any one of claims 10 to 13, characterized in that the volume of the excess material is 10% or more of the volume of the bonded resin shape. [Explanation of Symbols]

[0085] 6. Joint Members 14 Fixed side mold 15. Movable side mold 18 Primary molded part A 19 Primary molded part B 20 Bonding resin

Claims

1. A method for manufacturing a channel forming member in which a fluid channel is formed between a first component and a second component, A first step involves injection molding the first component at a first position between the pair of molds, and injection molding the second component at a second position between the pair of molds, A second step involves opening the pair of molds so that the first component remains in one of the molds and the second component remains in the other mold, and then moving the pair of molds relative to each other so that the first component and the second component face each other. A third step is to close the pair of molds so that the first component and the second component come into contact with each other, The process includes a fourth step of pouring molten resin around the contact area between the first component and the second component, In the fourth step described above, the molten resin forms a joint and a thickened portion. The joint portion abuts against the first component and the second component, The thickened portion may contact only one of the first component and the second component, or it may not contact either the first component or the second component. A method for manufacturing a flow channel forming member, characterized in that the volume of the thickened portion is 50% or more of the volume of the joint portion.

2. In the third step, the mold and the first component form a joining channel through which the molten resin corresponding to the thickened portion flows. In the fourth step, the thickened portion is formed by filling the joining channel with the molten resin. A method for manufacturing a flow channel forming member according to claim 1, wherein a part of the surface of the thickened portion formed by the mold and a part of the surface of the first component form the same surface.

3. In the third step, a resin reservoir is formed in the joining channel through which the molten resin flows by the first component, the second component, the mold, the first component and the mold, or the second component and the mold. In the fourth step, by filling the joining channel with the molten resin, an excess material is formed in part or all of the resin reservoir. The method for manufacturing a channel forming member according to claim 1, wherein the cross-sectional area of ​​the joining channel immediately after inflow into the resin reservoir is larger than the cross-sectional area of ​​the joining channel immediately before inflow into the resin reservoir.

4. In the third step, the first component, the second component, the mold, the first component and the mold, or the second component and the mold, form a resin reservoir and a constricted portion in the joining channel through which the molten resin flows, with the channel cross-sectional area being smaller than that upstream. The method for manufacturing a flow channel forming member according to claim 1, wherein in the fourth step, the molten resin passes through the constricted portion and then fills part or all of the resin reservoir portion, thereby forming an excess portion.

5. In the fourth step, the molten resin injected from the gate is filled in the joint, the thickened portion, and the excess portion in that order, as described in claim 3 or claim 4, for the method of manufacturing a flow channel forming member.

6. In the fourth step, the molten resin injected from the gate is filled in the thickened portion, the joint portion, and the excess portion in that order, as described in claim 3 or claim 4, for the method of manufacturing a flow channel forming member.

7. The method for manufacturing a flow channel forming member according to claim 3 or claim 4, wherein in the third step, the volume of the formed resin reservoir is 10% or more of the total volume of the molten resin.

8. A flow channel forming member having a first component, a second component, and a bonding resin shape formed by bonding resin in the space where the first component and the second component are in contact, wherein the first component, the second component, and the bonding resin shape are integrated, The first component and the second component form a fluid channel, The shape of the bonded resin is, A joint that contacts both the first component and the second component, A thickened portion that contacts only one of the first component and the second component, or does not contact either the first component or the second component, Includes, A flow channel forming member characterized in that the volume of the thickened portion is 50% or more of the volume of the joint portion.

9. The flow path forming member according to claim 8, characterized in that at least a portion of the surfaces other than the interface between the first component and the thickened portion form the same surface.

10. The flow path forming member according to claim 8, characterized in that the shape of the joining resin includes an excess material that contacts the first component or the second component.

11. The flow channel forming member according to claim 10, characterized in that the gate of the bonding resin is provided at the bonding portion, a connecting portion is provided between the bonding portion and the thickened portion, and a connecting portion is provided between the thickened portion and the excess portion.

12. The flow channel forming member according to claim 10, characterized in that the gate of the bonding resin is provided in the thickened portion, a connecting portion is provided between the thickened portion and the bonding portion, and a connecting portion is provided between the bonding portion and the excess portion.

13. The flow path forming member according to claim 11 or 12, characterized in that the cross-sectional area of ​​the excess material portion is larger than the cross-sectional area of ​​the connection portion with the thickened material portion, or the cross-sectional area of ​​the connection portion with the joint portion.

14. The flow channel forming member according to claim 10, characterized in that the volume of the excess material is 10% or more of the volume of the bonded resin shape.

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