JP2010194747A - Method for producing molding and liquid supply unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing a molding which can suppress the deformation of a sheet member even when the sheet member, a first molding member, and a second molding member are molded integratedly while the flexible sheet member is held between the first and second molding members and a liquid supply unit. <P>SOLUTION: The liquid supply unit is produced by executing a holding step in which a case member 14 is held in a movable mold 21, and each needle member 16 is held in a fixed mold 22, an arrangement step in which each filter 15 is arranged inside each peripheral wall part of the case member 14, a mold clamping step in which each filter 15 is held between the case member 14 and each needle member 16 by clamping a mold 20, and an injection step in which a molten resin is injected, into a joining cavity 27 formed in a spot for joining the case member 14 and each needle member 16 together, to flow toward the side of each filter 15 passing between each peripheral wall of the case member 14 and each needle member 16, so that the case member 14, each needle member 16, and each filter 15 are joined together. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a molded product such as a liquid supply unit and a liquid supply unit.

  Conventionally, what was described in patent document 1 is known as a manufacturing method of the hollow product made from a synthetic resin. That is, in Patent Document 1, the first semi-hollow molded product and the second semi-hollow molded product are held in an abutted state in a mold, and a resin is injected into the abutting portion to integrate them. Is manufacturing hollow products.

JP-A-6-238707

  By the way, in the manufacturing method of the hollow product described in Patent Document 1, when the flexible sheet member is insert-molded between the first semi-hollow molded product and the second semi-hollow molded product, the first semi-hollow When the resin is injected into the abutting portion between the molded product and the second semi-hollow molded product, the injection pressure of the resin acts on the sheet member from a direction parallel to the sheet member. For this reason, there existed a problem that a sheet | seat member will be compressed and deform | transformed with the injection pressure of resin.

  The present invention has been made paying attention to such problems existing in the prior art. The purpose is to suppress deformation of the sheet member even if the flexible sheet member is sandwiched between the first molded member and the second molded member. The object is to provide a method for manufacturing a molded article and a liquid supply unit.

  In order to achieve the above object, the method for producing a molded product of the present invention includes the first molded member, the second molded member, and a sheet member sandwiched between the first molded member and the second molded member. And a method of manufacturing a molded product in which the sheet member is integrally molded, wherein the first mold has the first molded member having a peripheral wall portion on the joint surface and the second mold holds the second molded member. Holding the sheet, placing the sheet member inside the peripheral wall portion of the first molding member, and clamping the first mold and the second mold to perform clamping of the sheet member and the first mold. Clamping step of clamping the sheet member between the first molded member and the second molded member in a state where a space is formed between the first molded member and between the sheet member and the second molded member. And the first molding member and the second molding The molten resin is injected into the joining cavity formed at the joining location with the material so as to flow toward the sheet member side at least between the peripheral wall portion of the first molding member and the second molding member. And an injection step for joining the first molded member, the second molded member, and the sheet member.

  According to this invention, the sheet member is disposed inside the peripheral wall portion of the first molding member, and the molten resin flows toward the sheet member side through between the peripheral wall portion of the first molding member and the second molding member. So that it is injected. For this reason, it is suppressed by a surrounding wall part that the injection pressure of molten resin acts with respect to this sheet member from the direction parallel to a sheet member. Therefore, even if the flexible sheet member is sandwiched between the first molded member and the second molded member, the sheet member can be prevented from being deformed even if they are molded integrally.

In the method for manufacturing a molded product according to the present invention, an inclined guide surface is formed with respect to the sheet member at a position facing the peripheral wall portion of the first molded member in the second molded member.
According to this invention, the guide surface guides the molten resin that flows between the peripheral wall portion of the first molded member and the second molded member toward the sheet member so as to flow obliquely with respect to the sheet member. It becomes possible.

In the method for manufacturing a molded product of the present invention, a convex portion is provided at a position facing the peripheral edge portion of the sheet member in the second molded member.
According to this invention, when the sheet member is sandwiched between the first molding member and the second molding member in the mold clamping step, the contact pressure of the second molding member with respect to the peripheral portion of the sheet member can be increased by the convex portion. It becomes possible.

In the method for manufacturing a molded article according to the present invention, the first molded member is formed with an undercut portion into which the molten resin flows in the injection step.
According to this invention, in the injection step, the molten resin flows into the undercut portion of the first molded member and is solidified, so that the solidified resin can be hardly separated from the first molded member.

  The liquid supply unit of the present invention is a liquid supply unit manufactured by the method for manufacturing a molded article having the above-described configuration, wherein the sheet member is a filter, and the first molded member has a flow path through which the liquid flows. The second molded member is a needle member that is formed in a tubular shape and is joined in such a manner that the flow path of the first molded member and the pipe line communicate with each other through the filter.

  According to the present invention, it is possible to provide a liquid supply unit in which the deformation of the filter is suppressed.

The front simplified view of the liquid supply unit of an embodiment. The perspective view which shows the case member and each needle member which were shape | molded by injecting a molten resin into the cavity of a metal mold | die primarily in embodiment. Sectional drawing of the case member in embodiment. In embodiment, the perspective view which shows a state when each filter is set to the case member shape | molded by carrying out the primary injection of molten resin to the cavity of a metal mold | die. The principal part expanded sectional view of FIG. In embodiment, sectional drawing which shows the state of a case member, each needle member, and each filter when performing the secondary mold clamping of a metal mold | die. The perspective view of FIG. The principal part expanded sectional view of FIG. Sectional drawing which shows a state when molten resin is secondary-injected into the cavity for joining of a metal mold | die in embodiment. The perspective view of the liquid supply unit of embodiment.

Hereinafter, a first embodiment embodying the present invention will be described with reference to FIGS.
FIG. 1 is a side view of a liquid supply unit 11 which is an example of a molded product (product) molded in the present embodiment. As shown in FIG. 1, the liquid supply unit 11 is a part for a printer to which a recording head 12 of the printer and four ink cartridges 13 are attached. A flat case member 14 as a first molding member, and a flexible The four disk-shaped filters 15 (see FIG. 4) as the sheet members and the four ink supply needle members 16 as the second molding members are integrally molded.

  That is, the liquid supply unit 11 sandwiches each filter 15 disposed so as to cover the openings of the ink supply paths 17 as four flow paths opened in parallel with the upper surface of the case member 14 with the case member 14. Each ink cartridge 13 is connected to each of the standing tubular needle members 16, and the recording head 12 is attached to the lower surface of the case member 14. Then, each ink in each ink cartridge 13 is supplied to the recording head 12 via a pipe line 18 (see FIG. 6) of each needle member 16 and each ink supply path 17 of the case member 14. Injected from a plurality of nozzles (not shown) opened in the lower surface.

Next, a method for manufacturing the liquid supply unit 11 will be described.
The liquid supply unit 11 of this embodiment is formed by a die slide injection molding method. In the die slide injection molding method, molten resin is primarily injected into two molds that are clamped by the primary mold to mold two molded parts at a time, and the molded parts are held one by one in the two molds. After performing the primary mold opening as described above, one of the two molds is slid in the direction perpendicular to the mold opening / closing direction so that the two molded parts face each other, and then the secondary mold clamping is performed. This is a molding method in which molten resin is secondarily injected into a cavity formed at a joint location of a molded part to join these two molded parts, and is particularly suitable for molding a hollow molded product.

  As shown in FIG. 3, a die slide injection mold 20 includes a movable mold 21 as a first mold and a fixed mold 22 as a second mold that are configured to be openable and closable. It is configured to be movable in a mold opening / closing direction that is a direction approaching and separating from the fixed mold 22 and to be slidable in a direction orthogonal to the mold opening / closing direction.

  In order to manufacture the liquid supply unit 11, first, after the primary mold clamping of the mold 20 is performed, the molten resin is primarily injected from the injection device (not shown) into the cavity of the mold 20. As shown in FIG. 2, the case member 14 and the four needle members 16 are formed at a time. At this time, the peripheral wall portion 23 is formed on the case member 14 so as to surround each ink supply path 17. The inner diameter of the peripheral wall portion 23 is set to be larger than the outer diameter of the opening portion of the ink supply path 17, and the portion between the opening portion of each ink supply path 17 and each peripheral wall portion 23 on the case member 14 is flat. The mounting surface 24 is the same. The upper surface of the peripheral wall portion 23 is higher than the placement surface 24, and the height difference between the upper surface of the peripheral wall portion 23 and the placement surface 24 is substantially the same as the thickness of the filter 15 (see FIG. 4). .

  Further, as shown in FIG. 3, around the portion of the cavity for molding the case member 14 in the mold 20 where each peripheral wall portion 23 is molded, the undercut portion 25 for molding the case member 14 is formed. A plurality of slide cores 26 protrude. Each slide core 26 is provided on the movable die 21 and is slidably movable so as to protrude and retract with respect to a cavity for molding the case member 14 in the mold 20. Therefore, when the case member 14 is formed, a plurality of undercut portions 25 are formed by the slide cores 26 around the peripheral wall portions 23 of the case member 14.

  Subsequently, the primary mold opening of the mold 20 is performed. At this time, the case member 14 is held by the movable mold 21 and each needle member 16 is held by the fixed mold 22 (holding step). Further, at this time, the unnecessary portion A (see FIG. 2) formed by the runner (not shown) of the mold 20 is removed. Subsequently, the movable mold 21 is slid in a direction perpendicular to the mold opening / closing direction with respect to the fixed mold 22 so that the placement surfaces 24 of the case member 14 and the needle members 16 are opposed to each other.

  Subsequently, as shown in FIGS. 4 and 5, one filter 15 is arranged on each placement surface 24 inside each peripheral wall 23 of the case member 14 (placement step). At this time, the upper surface of the filter 15 is substantially flush with the upper surface of the peripheral wall portion 23, and the peripheral surface of the filter 15 is in contact with the inner peripheral surface of the peripheral wall portion 23. Further, at this time, each filter 15 is sucked by a suction device (not shown) through each ink supply path 17 of the case member 14, and each filter 15 is placed on each placement surface 24 of the case member 14 by the suction force. Hold.

  Subsequently, as shown in FIGS. 6 and 7, the slide cores 26 are retracted from the undercut portions 25 of the case member 14 and the mold 20 is secondarily clamped. Thereby, the peripheral part of each filter 15 is clamped by each mounting surface 24 of each case member 14 and each needle member 16 (die clamping step).

  In this case, a space serving as a pipe line 18 is formed between the filter 15 and the needle member 16, and a space serving as an ink supply path 17 is formed between the filter 15 and the case member 14. That is, the pipe line 18 of the needle member 16 and the ink supply path 17 of the case member 14 communicate with each other via the filter 15. Further, at this time, a joining cavity 27 is formed at a joining portion of each needle member 16 and the case member 14 in the mold 20, and the joining cavity 27 is connected to each undercut portion 25 of the case member 14. Each communicates.

  As shown in FIG. 8, the lower surface 16a of the needle member 16 has an annular shape, and an annular convex portion 28 is provided on the inner peripheral edge of the lower surface 16a. Therefore, the peripheral edge portion of the filter 15 is pinched by the inner peripheral edge portion of the mounting surface 24 of the case member 14 and the convex portion 28 of the needle member 16. That is, the contact pressure of the needle member 16 with respect to the filter 15 is increased. Further, the outer peripheral edge portion of the lower surface 16a of the needle member 16 is a guide surface 29 inclined so as to rise outward, and the guide surface 29 faces the upper surface of the peripheral wall portion 23 of the case member 14. . Therefore, the guide surface 29 is inclined with respect to the filter 15. A portion of the lower surface 16 a of the needle member 16 between the convex portion 28 and the guide surface 29 is a flat surface 30 and a slight gap is formed between the peripheral portion of the filter 15.

  Subsequently, when the molten resin is secondarily injected from the injection device (not shown) into the bonding cavity 27 of the mold 20, as shown in FIG. Molten resin flows in (injection step). At this time, as shown in FIG. 8, the molten resin passes between the guide surface 29 of the needle member 16 and the upper surface of the peripheral wall portion 23 of the case member 14, and the flat surface 30 of the needle member 16 and the peripheral portion of the filter 15. However, it hardly penetrates into the filter 15.

  Here, when the injection pressure of the molten resin acts on the filter 15 from a direction parallel to the filter 15, the injection pressure causes the filter 15 to be pressed from the peripheral edges facing each other with the center portion interposed therebetween. As a result, the filter 15 is deformed so that the central portion thereof bends toward the pipe 18 or the ink supply path 17.

  In this regard, in this embodiment, since the peripheral surface of the filter 15 is covered by the peripheral wall portion 23 of the case member 14, the injection pressure of the molten resin acts on the filter 15 from a direction parallel to the filter 15. There is no. In addition, the molten resin is guided to the peripheral portion of the filter 15 so as to flow obliquely with respect to the filter 15 by the guide surface 29 of the needle member 16. Therefore, it is possible to effectively suppress the deformation of the filter 15 so that the central portion of the filter 15 is bent toward the pipe line 18 or the ink supply path 17.

When the secondary injected molten resin is cooled and solidified, the case member 14, each filter 15, and each needle member 16 are joined together, and the liquid supply unit 11 shown in FIG. 10 is obtained.
As described above, according to the embodiment described in detail, the following effects can be obtained.

  (1) The filter 15 is disposed inside the peripheral wall portion 23 of the case member 14, and the molten resin secondarily injected into the bonding cavity 27 in the injection step is the upper surface of the peripheral wall portion 23 of the case member 14 and the guide surface of the needle member 16. 29 and flows toward the filter 15. For this reason, the peripheral wall portion 23 can suppress the injection pressure of the molten resin from acting on the filter 15 from a direction parallel to the filter 15. Therefore, even if the flexible filter 15 is sandwiched between the case member 14 and the needle member 16, they can be prevented from being deformed even if they are integrally formed.

  (2) An oblique guide surface 29 is formed with respect to the filter 15 at a position facing the upper surface of the peripheral wall portion 23 of the case member 14 on the lower surface 16 a of the needle member 16. Therefore, the molten resin that flows toward the filter 15 through the space between the upper surface of the peripheral wall portion 23 of the case member 14 and the guide surface 29 of the needle member 16 flows obliquely with respect to the filter 15 by the guide surface 29. Can lead. Therefore, it can suppress effectively that the filter 15 deform | transforms so that it may be bent by the injection pressure of molten resin.

  (3) A convex portion 28 is provided at a position facing the peripheral edge portion of the filter 15 on the lower surface 16 a of the needle member 16. For this reason, when the peripheral portion of the filter 15 is sandwiched between the mounting surface 24 of the case member 14 and the needle member 16 in the mold clamping step, the contact pressure of the needle member 16 against the peripheral portion of the filter 15 is caused by the convex portion 28. Can be increased. As a result, the filter 15 can be securely held on the placement surface 24 of the case member 14.

(4) Since the case member 14 has an undercut portion 25 into which the molten resin secondarily injected into the bonding cavity 27 in the injection step is formed, the molten resin flowing into the undercut portion 25 is solidified. Thus, the solidified resin can be made difficult to peel off from the case member 14. That is, the case member 14 and the needle member 16 can be reliably and firmly joined with the filter 15 interposed therebetween.
(Example of change)
In addition, you may change the said embodiment as follows.

The molded product may be a synthetic resin product other than the liquid supply unit 11.
-The undercut part 25 of the case member 14 may be omitted altogether or only one.

  -The convex part 28 of the needle member 16 may be omitted. Moreover, when the convex part 28 of the needle member 16 is omitted, the thickness of the part corresponding to the convex part 28 before the omission in the filter 15 may be made thicker than the thickness of the other part.

The guide surface 29 of the needle member 16 may be parallel to the filter 15.
The annular peripheral wall portion 23 of the case member 14 is not necessarily provided continuously, and may be provided intermittently.

  The liquid supply unit 11 does not necessarily have to be manufactured by die slide injection molding. After the case member 14 and the needle member 16 are molded with separate molds, the molds are clamped in a state where they are held in normal molds not for die slide injection molding, and then the molten resin is put into the bonding cavity. You may make it join by injecting.

Furthermore, the technical idea which can be grasped from the above embodiment will be described below.
(A) a liquid supply unit formed by integrally forming the case member, the needle member, and the filter in a state where a filter is sandwiched between the case member and the needle member;
The first mold holds the case member having a peripheral wall portion provided so as to surround the flow path through which the liquid flows on the joining surface, and is formed into a tubular shape in the second mold and the flow path of the first molded member Holding the needle member joined in a state where the pipe line communicates through the filter;
The filter is disposed so as to cover the flow path inside the peripheral wall portion of the case member,
By clamping the first mold and the second mold, the case member and the needle member sandwich the filter,
In the bonding cavity formed at the bonding portion between the case member and the needle member, the molten resin flows at least between the peripheral wall portion of the case member and the needle member toward the filter side. A liquid supply unit that is formed by injecting and joining the case member, the needle member, and the filter.

  DESCRIPTION OF SYMBOLS 11 ... Liquid supply unit as a molded article, 14 ... Case member as 1st shaping | molding member, 15 ... Filter as sheet | seat member, 16 ... Needle member as 2nd shaping | molding member, 17 ... Ink supply path as a flow path, DESCRIPTION OF SYMBOLS 18 ... Pipe line, 21 ... Movable type as 1st type | mold, 22 ... Fixed type | mold as 2nd type | mold, 23 ... Peripheral wall part, 25 ... Undercut part, 27 ... Cavity for joining, 28 ... Convex part, 29 ... Guide surface.

Claims (5)

A method of manufacturing a molded product that integrally molds the first molded member, the second molded member, and the sheet member in a state in which the sheet member is sandwiched between the first molded member and the second molded member,
Holding the first mold with the first mold member having the peripheral wall portion on the joint surface and holding the second mold member with the second mold; and
An arrangement step of arranging the sheet member inside the peripheral wall of the first molded member;
A state in which a space is formed between the sheet member and the first molded member and between the sheet member and the second molded member by clamping the first mold and the second mold. And a clamping step of sandwiching the sheet member between the first molding member and the second molding member;
The molten resin is passed through at least between the peripheral wall portion of the first molded member and the second molded member in the bonding cavity formed at the joint location between the first molded member and the second molded member. A method for producing a molded article, comprising: an injection step of injecting the sheet member to flow toward the sheet member side and joining the first molded member, the second molded member, and the sheet member. 2. The molded product according to claim 1, wherein an oblique guide surface is formed with respect to the sheet member at a position facing the peripheral wall portion of the first molded member in the second molded member. Manufacturing method. The method for producing a molded product according to claim 1, wherein a convex portion is provided at a position facing the peripheral edge portion of the sheet member in the second molded member. 4. The molded article according to claim 1, wherein an undercut portion into which the molten resin flows in the injection step is formed in the first molded member. 5. Method. A liquid supply unit manufactured by the method for manufacturing a molded product according to any one of claims 1 to 4,
The sheet member is a filter, the first molded member is a case member having a flow path through which a liquid flows, the second molded member is formed in a tubular shape, and the flow path of the first molded member and the filter are connected to each other. A liquid supply unit, which is a needle member joined in a state where the pipe line communicates therewith.

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