JP2008001004A - Manufacturing method of liquid feeding part of liquid storage container and liquid storage container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of an ink tank which can reduce the number of components by fixing the ink feeding member of a head without adding the member which has not an ink feeding function while providing a liquid storage container wherein an ink hardly scatter even when an external force is applied to the tank more largely than in a usual using state like the case such as making the tank fall accidentally at changing it. <P>SOLUTION: The manufacturing method of the liquid feeding part of the liquid storage container includes the processes which comprise a process of heating a meniscus forming member and welding it to the liquid feeding part and a process of heating a liquid guiding member at the temperature of the first melting point or higher and below the second melting point and of fusing and welding the component which melts at the first melting point into the meniscus forming member. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a liquid storage container, and more particularly to a method for manufacturing a liquid supply portion of a liquid storage container that supplies ink to a head and a liquid storage container in an ink jet recording apparatus.

  Conventionally, a replaceable tank has been provided as an ink tank for an inkjet printer.

  The ink tank shown in FIG. 9 is provided with an ink containing portion 113 inside the ink tank 100 and an intermediate chamber below it.

  Inside the ink container, there are a capillary member 102 for holding ink and a first meniscus forming member 101 having a large number of fine holes.

  In the intermediate chamber, an ink guide member 104 supported by an ink guide member presser 103 and extending to the bottom surface of the tank is provided in a state of being impregnated with ink.

  Connected to the ink supply section at the bottom of the tank are a second meniscus forming member 105 provided with a large number of fine holes, and a coupling capillary member 106 for supplying ink to the head 109.

  By connecting and disconnecting the tank, the coupling portion capillary member 106 of the tank and the filter 108 of the head are joined, and ink is supplied to the nozzle.

The incorporation of the coupling portion capillary member 106 and the second meniscus forming member 105 into the tank will be described later with reference to FIG.
When the tank is not attached to the head, the coupling portion capillary member 106 is exposed to the outside air.

  A fibrous felt or the like is used as the material of the coupling portion capillary member, and a material such as polyester, acrylic, or polypropylene is used as the felt material.

  The material of the second meniscus forming member that is in contact with the coupling portion capillary member uses a stainless steel mesh filter.

  Since the surface tension of the ink formed in the fine pores having a filter particle size of about 40 μm and the negative pressure inside the tank act, the ink in the intermediate chamber leaks outside through the coupling capillary member 106. Absent.

  FIG. 10 is an enlarged view of the connecting portion (ink supply portion) to the head. As shown in FIG. 10B, first, the coupling portion capillary member 106 and the second meniscus forming member 105 are placed in the lower guide 112.

  Next, the upper guide 110 is covered and sandwiched and attached to the joint outer periphery 107 of the tank from the outside of the tank 100.

  A holding part 113 is formed on the tank intermediate chamber side of the joint outer peripheral part 107, and the holding part 113 comes into contact when the structure shown in FIG.

In order to fix the second meniscus forming member 105 and the coupling capillary member 106 having an ink supply function to the head to the tank, the fixing members 110 and 112 are used.
Japanese Patent Laid-Open No. 09-300646 JP 09-286115 A

  However, in the above-described configuration, in order to fix the second meniscus forming member 105 and the coupling portion capillary member 106 having an ink supply function to the head to the tank, a dedicated member for fixing is necessary.

  The addition of parts that do not have an ink supply function, such as the upper guide 110 and the lower guide 112, increases the cost when manufacturing an inexpensive ink tank and increases the number of manufacturing steps of the tank.

  Further, when an external force other than the normal use state is applied in the ink supply direction to the head, such as dropping the ink tank, the ink may leak out from the ink supply unit.

  The present invention has been made paying attention to the above-mentioned problems of the prior art, and achieves the following objects.

  An object of the present invention is to provide an ink tank manufacturing method that can reduce the number of parts by fixing an ink supply member to a head without adding a member that does not have an ink supply function.

  Another object of the present invention is to provide an ink tank with less ink scattering even when an external force is applied to the tank beyond the normal use state, such as when the ink tank is replaced or accidentally dropped. There is.

  The external force applied to the tank in a normal use state includes an inertial force applied to the tank accompanying the carriage movement of the recording apparatus, an external force due to suction from the cap, and the like.

In order to achieve the above object, a method for producing a liquid supply part of a liquid storage container of the present invention includes:
A liquid container and a liquid supply unit for supplying liquid to the outside;
In the manufacturing method of the liquid supply part of the liquid storage container in which the liquid supply part is composed of a meniscus forming member and a liquid guiding member, the following steps are included.

Heating the meniscus forming member and welding to the liquid supply unit;
The liquid guiding member is composed of a member having a first melting point and a member having at least two kinds of melting points consisting of a second melting point that is higher than the first melting point,
Heating the liquid guide member at a temperature equal to or higher than the first melting point and lower than the second melting point, and melting and welding the component that melts at the first melting point in the meniscus forming member. .

The liquid storage container of the present invention is
A housing, and a liquid storage chamber configured to store liquid directly and have the housing as one side and a flexible film as the other side;
A negative pressure source provided in the liquid storage chamber for generating a negative pressure;
A liquid supply unit configured to supply a liquid to the outside, and a liquid supply member including a meniscus forming member and a liquid guide member is welded to the liquid supply unit;
One surface of the meniscus forming member faces the bottom of the liquid storage portion in the direction in which the liquid storage container is attached to the recording means, and the other surface of the meniscus forming member is the liquid guide member. Abut,
The liquid guide member is composed of a member having a first melting point and a member having at least two melting points including a second melting point that is higher than the first melting point.

  According to the present invention, it is possible to fix the ink supply member of the ink tank to the tank without using the fixing member that does not have the ink supply function in a state where the ink supply function and the leakage prevention function are ensured.

  With the reduction of the fixing member for fixing the ink supply member to the head, there is an effect of reducing the number of tank manufacturing steps and increasing the production efficiency in the ink tank manufacturing.

  In addition, according to the present invention, even when an external force exceeding the normal use state acts on the tank such as accidentally dropping the tank, there is an effect of preventing the ink from scattering from the ink supply unit to the outside.

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

(Example 1)
FIG. 1A is a perspective view illustrating the appearance of an ink tank according to an embodiment of the present invention, and FIG. 1B is an exploded view thereof.
FIG. 2 is a cross-sectional view of the ink tank in FIG. 1 cut along the AA position.

  1 and 2, reference numeral 1 denotes an ink tank, 2 denotes a container body, and 3 denotes an ink supply unit.

(Overall configuration of ink tank)
The ink tank 1 includes an ink supply unit 3 connected to the ink introduction unit of the recording head and an ink storage unit that stores the supplied ink 10.

  The ink containing portion is composed of a deformable film 8 made of a flexible material, the container body 2, and a lid member 9.

  The inside is substantially configured as a sealed space except for the ink supply unit 3, and the ink 10 is stored in a negative pressure state in the ink storage unit serving as the sealed space.

  In this embodiment, for example, the ink is stored at a negative pressure of about 100 to 200 mmAq.

  The center part of the film 8 is a convex shape, and the cross section is a trapezoid.

  In this embodiment, a plate member 7 is provided in accordance with the convex shape at the center of the film, and this plate member 7 is biased outward by a spring 6.

  Due to this outward bias, a negative pressure is generated in the ink containing portion. And this convex shape moves according to the change of the ink amount of the ink containing part and the pressure fluctuation.

  The film 8 is a flexible film that is extremely soft and deformable, and is welded and fixed to the periphery of the edge of the lid member 9 that extends to substantially the center in the width direction of the container body 2.

  Further, the lid member edge is welded and fixed to the container main body 2 so as not to leak from the outside.

  The lid member 9 serves as a shell that protects the film 8 from external force.

  Further, the lid member 9 is provided with an atmosphere communication port 11 so that the film 8 can freely move inside the ink tank 1.

  The film 8 changes its shape from a convex shape to a concave shape in accordance with the consumption of the ink 10.

  An ink supply unit 3 is provided on the bottom surface of the ink storage unit. The ink supply unit becomes a flow path communicating with the recording head.

  The bottom surface of the ink containing portion refers to the bottom surface in a posture when the ink tank is attached to the head during recording.

  As shown in FIG. 1B, an ink guiding member 4 is provided inside the ink supply unit, and a meniscus forming member 5 is provided at the interface with the ink containing unit.

  The ink guiding member and the meniscus forming member have a surface in a direction intersecting with the direction in which ink is supplied from the ink tank to the head during recording, and are disposed inside the ink supply portion of the ink tank.

(Meniscus forming member)
The meniscus forming member 3 has a meniscus holding force stronger than the negative pressure of the ink storage unit in order to prevent air from entering from the ink supply unit 3 to the ink storage unit that holds the ink 10 in a negative pressure state. Have.

  Since the meniscus forming member 5 has a meniscus holding force of about 250 to 350 mmAq, the meniscus is not broken by the negative pressure of the ink containing portion having an internal negative pressure of about 100 to 200 mmAq.

  In the present embodiment, for example, a mesh filter made of SUS304 material having a transmission dimension of 15 to 30 μm is employed as the meniscus forming member.

  The meniscus forming member is not limited to a mesh filter, and may be any member that exhibits an equivalent effect.

  For example, it may be a felt-like high-density fiber body or a porous fiber body formed of metal fibers.

  One surface of the meniscus forming member 5 is in contact with the ink containing portion, and the other surface is in contact with the ink guiding member 4.

(Installation of ink tank and head)
FIG. 6 is an exploded perspective view illustrating a situation where the ink tank is attached to the recording head.

  FIG. 7 is a cross-sectional view seen from a side surface for explaining a connection state between the recording head and the ink tank shown in FIG.

  As shown in FIG. 6, the ink tank 1 is connected from above the recording head 21 so that the ink supply unit 3 and the ink introduction unit 9 communicate with each other.

  The ink introduction part 9 is formed at the end of the ink flow path 24 and includes a filter 18.

  In this embodiment, for example, a SUS304 material suspension mesh filter having a transmission dimension of 5 to 10 μm or a felt-like suspension filter is employed.

  The ink introduction part 19 includes a seal member 20 around the ink introduction part 19.

  Furthermore, as shown in FIG. 7, by attaching the ink tank 1, the outer edge of the ink supply part 3 of the ink tank 1 is pressed against the seal member 20, and the connection part of the ink flow path is sealed.

  Further, the communication between the ink tank 1 and the ink flow path 24 of the recording head 21 is performed when the ink guide member 4 of the ink tank 1 contacts the filter 18 of the head 21.

(Ink guide member)
The ink guiding member 4 is interposed in the ink flow path connecting portion between the recording head 21 and the ink tank 1.

  The ink 10 is guided to the head by connecting between the meniscus forming member 5 of the ink tank 1 holding the ink 10 with the meniscus and the filter 18 of the recording head 21.

  In the present invention, the ink guide member 4 is a fibrous body composed of at least two types of high melting point components and low melting point components.

  As described above, a 6 denier fiber made of polypropylene and polyethylene is used, and a fiber body having a fiber density of 0.04 to 0.1 g / cm 3 is employed.

  The melting point of polyethylene is about 120 ° C., the melting point of polypropylene is about 160 ° C., and the temperature difference is close to 40 ° C.

  The material of the ink guide member is preferably a low-density fiber body having a lower flow resistance than the meniscus forming member.

  Other materials mainly include polyester, nylon, polyethylene, cellulose, polyurethane and the like.

  A material that is chemically stable to ink and good in wettability is desirable. As long as the meniscus forming member is made of a metal such as a SUS mesh filter, the ink guiding member may be a fiber bonding member in which the resin fiber is combined with the filter.

  When the tank is mounted on the head, the head comes into contact with the ink guiding member, and the depth of penetration is about 0.3 to 0.9 mm. The thickness of the ink guiding member is about 1 to 2 mm.

  The thickness of the ink guiding member may be the amount of biting of the filter 18 described above into the head = contact depth + α (a margin).

  By adopting such a configuration, the thickness of the ink guiding member is thin, and the amount of air contained therein can be reduced.

  In the maintenance operation performed after the ink tank is mounted, the air in the flow path including the ink guiding member can be almost removed, so that good printing can be performed.

  Further, the ink guide member 4 needs to quickly store the ink remaining in the connection portion of the ink flow path in the ink storage portion of the ink tank 1 when the ink tank 1 is removed.

  For this reason, the meniscus holding force of the ink guide member 4 is set to be weaker than the internal negative pressure of the ink containing portion.

  In the present embodiment, for example, the meniscus holding force of the ink guiding member 4 is set to 20 to 80 mmAq with respect to the internal negative pressure of 100 to 200 mmAq in the ink containing portion.

  For this reason, the ink 10 remaining in the ink flow path portion is transferred to the ink guide member 4 and stored on the ink storage portion side via the meniscus forming member 5.

  The ink guiding member 4 also needs a function of reducing the scattering of the ink 10 when the user accidentally drops the ink tank 1.

  The ink 10 stored in the ink tank is configured to form a meniscus with the meniscus forming member 5 and to cover the surface with the ink guiding member 4.

  The ink that is about to scatter when dropped flows from the inside of the tank to the ink guiding member 4 that is a fibrous body due to the action of external force accompanying the fall.

  However, the meniscus holding force of the meniscus forming member is stronger than the negative pressure of the ink containing portion, and the meniscus holding force of the ink guiding member is weaker than the negative pressure of the ink containing portion.

  For this reason, the ink that has flowed to the ink guide member due to the fall is accommodated in the container body 2 again.

  In order to have the ink storage function as described above, the meniscus force may be changed by changing the fiber direction of the meniscus forming member and the fiber direction of the ink guiding member.

  For example, the fiber direction of the meniscus forming member may be a direction that blocks the ink supply to the head, and the fiber direction of the ink guide member may be the ink supply direction to the head.

  The ink tank and the recording apparatus having the configuration of the present embodiment can reduce the chance of staining the surroundings because the ink hardly remains in the connection portion when the ink tank is removed.

  Further, even when the user accidentally drops the ink tank, it is possible to reduce ink scattering.

(Incorporation of ink guide member and meniscus forming member into container)
FIG. 2A is a cross-sectional view of the ink tank according to the first embodiment of the present invention.

  FIG. 4B is an enlarged view of the ink supply unit. (C) is an enlarged view of the end of the ink supply unit.

  Reference numeral 14 denotes a meniscus forming member joint, 15 denotes an ink flow path, 13 denotes an ink guide member joint, and 12 denotes a low melting point component of the ink guide member.

  In the present embodiment, polypropylene is used as the material of the container body 2, but it is not limited to polypropylene as long as it is chemically stable with respect to ink.

  The ink guide member 4 is fixed as shown in FIGS.

  The ink guide member low melting point component 12 melted from the ink guide member 4 is fixed in the pores of the ink guide member joint 13 provided in the meniscus forming member 5.

  Specifically, the low melting point component 12 of the ink guide member is obtained by melting polyethylene of the ink guide member.

  3 and 4 are explanatory views for explaining a method of manufacturing the ink supply unit 3 of such an ink tank.

  FIG. 3 is a diagram for explaining a process of joining the meniscus forming member 5 to the ink supply unit 3.

  The container body 2 is positioned so that the ink supply unit 3 is on the upper surface. The meniscus forming member 5 is placed on the rib 17 provided in the ink supply unit 3 shown in FIG.

  In this embodiment, the material of the rib 17 of the container is polypropylene and has a melting point of about 160 ° C.

  The rib 17 is melted from above the rib using the meniscus forming member bonding horn 16 and interposed in the pores of the meniscus forming member 5 to join the meniscus forming member to the tank.

  FIG. 4 is a diagram for explaining a process of joining the ink guide member 4 to the ink guide member welding portion 13 provided on the meniscus forming member 5, and is an enlarged view of the ink supply portion 3.

  4A is a perspective view, and FIGS. 4B and 4C are cross-sectional views.

  As described above, the ink guide member 4 is a member made of a fibrous body having a high melting point component and a low melting point component.

  In this embodiment, a fiber body made of polyethylene having a melting point of about 120 ° C. and polypropylene having a melting point of about 160 ° C. is used as the low melting point component.

  First, as shown in FIG. 4A, the container body 2 is positioned so that the ink supply unit 3 is on the upper surface, and the ink guide member 4 is placed on the meniscus forming member 5 joined in the previous step. .

  Then, the ink guiding member joining horn 26 is pressed into the range of the ink guiding member joining portion 13 of the meniscus forming member 5.

  In this step, the ink guiding member 4 is melted and bonded to the pores of the meniscus forming member.

  The temperature of the ink guiding member joining horn 26 may be not less than the melting point of the low melting point component of the thermoplastic resin contained in the ink guiding member 4 and less than the melting point of the high melting point component.

  In the present example, for example, the temperature was set to a melting point of about 120 ° C. or higher for polyethylene and lower than about 160 ° C. for polypropylene.

  By setting the temperature of the ink guide member joining horn 26 in this way, the high melting point component of the ink guide member remains reliably in the ink guide member without melting.

  Therefore, the strength of the ink guiding member can be maintained as the core member.

  As described above, the meniscus forming member 5 is joined to the ink supply unit 3 in the step of FIG. 3, and the ink guiding member is further joined in the step of FIG.

  The place where the meniscus forming member and the ink guiding member are melted may be at any position outside or inside the ink flow path section as long as the necessary amount of ink is supplied from the tank to the head.

  Ink supply members such as a meniscus forming member and an ink guide member can be directly joined to the ink tank without using a fixing member having no ink supply function.

  FIG. 5 is a view showing the meniscus forming member 5 after joining, and FIG. 5 (a) is a first embodiment of the present invention.

  Reference numeral 14 denotes a meniscus forming member joint, 15 denotes an ink flow path, and the other area 13 is an area that can be an ink guide member joint.

  This is an example in which the ink guide member joining portion 13 is provided outside the meniscus forming member joining portion 14.

(Other examples)
FIG. 5B shows a second embodiment of the present invention.

  The meniscus forming member and the ink guide member need not be joined to all the regions that can become the ink guide member joint portion 13.

  As shown in FIG. 5B, a part of the region that can become the ink guide member joint portion 13 may be set as the ink guide member joint portion.

  In the actual manufacturing process, as shown in FIGS. 4B and 4C, the position of the welding horn 26 may be shifted and only the necessary joints may be welded.

  Further, the shape and position of the joint portion are not limited to those illustrated.

  3 and 4, the meniscus forming member is first welded directly to the ink tank, and then the ink guide member is further welded.

  In order to reduce the manufacturing process, the meniscus forming member and the ink guide member may be directly welded to the ink tank in one process.

  A step of melting the ink guide member, interposing a molten component inside the meniscus forming member, and fixing to the ink supply port may be included.

  Further, the process may be a process in which only the joint portion is welded in advance to the meniscus forming member and the ink guide member, and then incorporated into the ink tank as a combined ink supply member.

  FIG. 5C shows a third embodiment (d) of the present invention, which is a fourth embodiment, in which the ink guiding member joint portion 13 is provided inside the meniscus forming member joint portion 14.

  The ink guide member joining portion 13 can be installed inside the meniscus forming member joining portion 14 as long as the function of the ink supply portion is not hindered.

  Further, as shown in FIG. 5D, the ink guide member joining portion 13 may be provided on a part of the inside of the meniscus forming member joining portion 14.

  In any case, the shape and position of the ink guide member joint portion 13 are not limited to those shown in the drawings as long as a sufficient amount of ink is supplied from the tank to the head.

  FIG. 8 is a sectional view for explaining an ink tank according to a fifth embodiment of the present invention.

  In the ink tank shown in FIG. 8, the flexible film 8 is welded and fixed to the end of the middle step portion 23 provided at substantially the center in the width direction of the ink tank so as not to leak from the outside.

  Ink 10 is stored in the ink storage portion.

  Further, an ink flow path portion connected to the ink supply portion 3 is provided on the bottom surface of the ink storage portion, and the meniscus forming member 5 is welded and fixed from the outside of the container body 2 as shown in FIG.

  A rib 25 is provided inside the ink supply unit 3. After the meniscus forming member 5 is welded to the ink tank 1, the ink guiding member 4 is brought into contact between the ribs 25 of the ink supply unit 3 from the outside of the container.

  Since the ink guiding member 4 is a fibrous body having an elastic force such as a resin, it can be pushed and inserted between the ribs 25.

  However, in this state, the ink guide member is not fixed to the ink container but is in contact with the meniscus forming member.

  Thereafter, the ink guide member 4 is welded and fixed to the ink supply unit 3 from the outside of the ink tank by the process described in the first embodiment.

  In the first embodiment described above, the meniscus forming member 5 is configured to hold and fix the ink guiding member 4, and thus the meniscus forming member 5 is configured to have a larger main surface size than the ink guiding member 4.

  When the ink tank 1 is mounted on the recording head 21, the flow resistance of the meniscus forming member having a large ink transmission area is smaller than the flow resistance of the head-side filter 18 having a small transmission area.

  Even if the size of the meniscus forming member is halved, the increase in pressure loss at the connection to the head is only about 5%.

  There is no problem even if the size of the meniscus forming member 5 is made smaller than the size of the ink guiding member 4 and welded to the ink tank as in the configuration of the present embodiment. The meniscus forming member 5 is, for example, a metal SUS mesh filter and is expensive. Therefore, by reducing the size, the cost of the ink tank can be reduced.

  The ink tank of this embodiment has a configuration in which the area of the main surface of the meniscus forming member is smaller than the area of the main surface of the ink guiding member, and the fixing method to the ink tank may be the same.

(A) An oblique view for explaining the ink tank of the present invention, (b) an exploded view for explaining the ink tank of the present invention. (A) It is a figure explaining the ink tank of the 1st Example of this invention, and is AA sectional drawing of the tank shown in FIG. (B) Enlarged view of the ink supply unit, (c) Enlarged view of the end of the ink supply unit Meniscus forming member joining process explanatory drawing of this invention BRIEF DESCRIPTION OF THE DRAWINGS It is ink drawing member joining process explanatory drawing of this invention, (a) Joining process explanatory perspective view, (b) Joining process explanatory sectional view with a horn outside, (c) Joining process explanatory sectional view with a horn inside It is a joining place of a meniscus forming member and an ink guide member, and (a) an explanatory view in which an ink guide member joint portion in the first embodiment of the present invention is on an outer portion of the meniscus forming member; (C) An explanatory view with an ink guide member inside the third embodiment of the present invention, (d) An ink guide in the fourth embodiment of the present invention. Explanatory drawing that member is in part inside Exploded perspective view of head and ink tank installation explanation Side sectional view of head and ink tank installation explanation Sectional view of the tank with the meniscus forming member shape changed according to the fifth embodiment of the present invention Ink tank and head sectional view described in Patent Document 1 Fixing method explanatory drawing by the fixing member of patent document 2

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ink tank 2 Container main body 3 Ink supply part 4 Ink guide member 5 Meniscus formation member 6 Elastic member (spring)
8 Flexible film

Claims (15)

A liquid container and a liquid supply unit for supplying liquid to the outside;
In the manufacturing method of the liquid supply part of the liquid storage container in which the liquid supply part is composed of a meniscus forming member and a liquid guiding member, the following steps are included.
Heating the meniscus forming member and welding to the liquid supply unit;
The liquid guiding member is composed of a member having a first melting point and a member having at least two kinds of melting points consisting of a second melting point that is higher than the first melting point,
Heating the liquid guide member at a temperature equal to or higher than the first melting point and lower than the second melting point, and melting and welding the component that melts at the first melting point into the meniscus forming member. A method for manufacturing a liquid supply part of a liquid container. The melted portion of the liquid guide member to the meniscus forming member is
The manufacturing method of the liquid supply part of the liquid container according to claim 1, further comprising an outer peripheral region of the meniscus forming member. The melted part of the liquid guide member to the meniscus forming member is
The method for manufacturing a liquid supply part of a liquid container according to claim 1, comprising a part of an outer peripheral region of the meniscus forming member. The melted part of the liquid guide member to the meniscus forming member is
2. The method for manufacturing a liquid supply part of a liquid container according to claim 1, wherein the method does not include an outer peripheral region of the meniscus forming member and is an inner region of the outer peripheral region. The melted part of the liquid guide member to the meniscus forming member is
2. The method for manufacturing a liquid supply part of a liquid container according to claim 1, wherein the method does not include an outer peripheral region of the meniscus forming member and is a part of an inner region of the outer peripheral region. In the manufacturing method of a liquid supply part of a liquid storage container, comprising a liquid supply part for supplying liquid to the outside, wherein the liquid supply part includes a liquid supply member composed of a meniscus forming member and a liquid guide member.
For the meniscus forming member,
The liquid guiding member comprising a member having a first melting point and a member having at least two kinds of melting points comprising a second melting point that is higher than the first melting point,
Pre-melting at the first melting point and welding to the meniscus forming member to form the liquid supply member;
And a step of welding the liquid supply member to the liquid supply portion at the second melting point of the liquid guide member.   The liquid supply unit includes a convex edge provided at an opening of the liquid supply unit, and the meniscus forming member fixed to a bottom surface of the liquid storage unit in a direction in which the liquid storage container is attached to a recording unit. The method for manufacturing a liquid supply part of a liquid storage container according to claim 1, wherein the liquid guide member is sandwiched between the liquid supply member and the liquid supply member.   The method for manufacturing a liquid supply part of a liquid storage container according to claim 1, wherein the meniscus forming member is a porous fiber body formed of metal fibers.   The method for manufacturing a liquid supply part of a liquid storage container according to claim 1, wherein an area of the meniscus forming member is smaller than an area of the liquid guiding member.   The method for manufacturing a liquid supply part of a liquid storage container according to claim 1, wherein the meniscus forming member has a fiber density higher than that of the liquid guiding member.   The method for manufacturing a liquid supply part of a liquid container according to claim 1, wherein the liquid guiding member is a fiber body formed of resin fibers or metal fibers.   The method for manufacturing a liquid supply part of a liquid container according to claim 1, wherein the fiber direction of the meniscus forming member is different from the fiber direction of the liquid guiding member. A housing, and a liquid storage chamber configured to store liquid directly and have the housing as one side and a flexible film as the other side;
A negative pressure source provided in the liquid storage chamber for generating a negative pressure;
A liquid supply unit configured to supply a liquid to the outside, and a liquid supply member including a meniscus forming member and a liquid guide member is welded to the liquid supply unit;
One surface of the meniscus forming member faces the bottom of the liquid storage portion in the direction in which the liquid storage container is attached to the recording means, and the other surface of the meniscus forming member is the liquid guide member. Abut,
The liquid guide member is composed of a member having a first melting point and a member having at least two types of melting points including a second melting point that is higher than the first melting point. . The meniscus holding force of the meniscus forming member is stronger than the negative pressure in the liquid container,
The liquid container according to claim 13, wherein a meniscus holding force of the liquid guide member is weaker than a negative pressure in the liquid container. The liquid container according to claim 13, wherein the liquid is ink.

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