JP2016060502A - Hinge cap and production method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hinge cap which can reduce friction drag when opening and closing an upper lid, as possible, and which can achieve seal ability.SOLUTION: A hinge cap is injection molded, and then an upper lid is closed, thereby a film of a cap body is deformed by plastic deformation so as to match a shape of a projection of the upper lid, and the film is brought into contact over whole outer periphery of the projection tightly. In detail, the hinge cap comprises: a side wall which is a cylindrical shape and which is attached to the container body; a top plate for closing one opening end part of the side wall, and on which an exhaust hole is formed; a cap body which includes a film thinner than the top plate and projecting toward a direction where bore diameter becomes narrower, from part of the exhaust hole; an upper lid including an upper plate covering the top plate, and a projection projecting from the upper plate and entering the exhaust hole until penetrating the film; and a hinge for connecting the upper lid to the cap body. When the upper lid is closed, the inner peripheral shape of the film is a tight contact shape same to a projection outer peripheral shape, and when the upper lid is opened, the inner peripheral shape of the film is a similar shape same to or shrunk to the tight contact shape.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a hinge cap in which a cap body and an upper lid are connected by a hinge and a method for manufacturing the same.

  As an example of a conventional hinge cap, a cap body to be mounted on the container body, an upper lid for opening and closing the cap body, and a hinge for connecting the upper lid to the cap body, the cap body has a plurality of openings, There is an inner surface provided with a protrusion that fits into the opening (Patent Document 1).

  FIG. 2 of Patent Document 1 shows three openings for discharging the contents, and one of the openings has a tapered surface that tapers downward at the top and a cylindrical surface at the bottom. Yes. On the other hand, the projection corresponding to this one opening has a cylindrical shape with an outer diameter slightly larger than the diameter of the opening. When the upper lid is pushed to close the hinge cap from the opened state, the upper lid rotates around the hinge, the protrusion collides with the tapered surface, and the upper lid is in a half-open state without closing. When the upper lid in the half-open state is pushed in again, the projection moves on the tapered surface of the opening, and finally the upper lid is closed, and the projection is elastically deformed and fitted into the cylindrical surface of the opening.

JP-A-8-169460

  However, the fitting between the one opening and the protrusion is a tight state (a tight state without a gap) because the elastic deformation of the protrusion is used. This is because the outer diameter of the projection that is originally cylindrical is slightly larger than the inner diameter of the opening, so that when the protrusion with a larger outer diameter is fitted into the opening, the outer peripheral surface of the protrusion opens. The protrusion is elastically deformed in the direction in which the outer diameter is reduced by being pushed by the cylindrical surface which is the inner surface shape of the protrusion. Since it is elastically deformed, a large close force is generated in the radial direction between the opening and the protrusion in the fitted state. Therefore, a large frictional resistance is generated between the protrusion and the opening while the upper lid is opened and closed, that is, while the protrusion enters and exits from the opening, and the hermeticity deteriorates as the opening and closing are repeated.

  Further, by design, by making the shape and position of the opening completely the same as the shape and position of the protrusion, the opening and the protrusion can be brought into close contact with each other in the closed state of the upper lid.

  However, in reality, since an error in molding occurs for each product, the shape and position of the opening and the protrusion cannot be made completely the same. Therefore, in designing, the outer diameter of the protrusion is slightly larger than the inner diameter of the opening to absorb the forming error related to the shape, the opening is tapered, and the protrusion is guided with respect to the opening. Is absorbed.

  When closing the top lid, it is necessary to push the top lid twice, pressing the top lid, pressing the top lid again after the protrusion collides with the taper surface and opening halfway. It is desirable to be able to close the top lid.

  The present invention was created in view of the above circumstances, and its purpose is to make the frictional resistance when opening and closing the upper lid as small as possible, and to prevent the deterioration of the sealing performance due to opening and closing of the upper lid as much as possible and its It is to provide a manufacturing method.

  A hinge cap according to the present invention includes a cap body in which a discharge hole is formed, an upper lid that can open and close the discharge hole of the cap body, and a hinge that connects the upper cover to the cap body. The cap body has a cylindrical side wall to be attached to the container body, a top plate that closes one open end of the side wall and has a discharge hole, and is thinner than the top plate and has a diameter from a part of the discharge hole. Includes a projecting film that narrows. The upper lid includes an upper plate that covers the top plate and a projection that protrudes from the upper plate and enters the discharge hole until it penetrates the membrane. And the outer peripheral part of a discharge hole and a film | membrane are made into a synthetic resin at least among top plates. In addition, the shape of the protrusion is the same in the open state and the closed state of the upper lid. The inner peripheral shape of the membrane shape is the same close shape as the outer peripheral shape of the protrusion in the closed state of the upper lid when viewed from the direction in which the protrusion enters the discharge hole, and is the same or reduced in the closed state of the upper lid. The present invention is characterized by the similar shape.

Whether or not a gap is formed between the protrusion and the discharge hole in the closed state of the upper lid is not questioned, but in order to make the frictional resistance when opening and closing the upper lid as small as possible, desirable.
That is, a gap is formed over the entire circumference in the circumferential direction between the portion of the discharge hole other than the film and the projection.

An example of a specific shape of the film is as follows.
That is, the membrane has a shape in which the shape of the portion on the top plate side of the entire length in the penetrating direction protrudes inward from the extension line in the direction along the inner surface of the discharge hole based on the thickness direction of the top plate. It is.

An example of the specific shape of the detailed film is as follows.
That is, the film has a curved shape in which the shape of the portion on the top plate side of the entire length in the penetrating direction is recessed in a circular arc shape toward the cylindrical center line which is the shape of the film itself.

Furthermore, the more specific shape of the film is as follows.
That is, the position of the center of the inner peripheral shape of the film is the same between the opened state and the closed state of the upper lid.

The more specific shape of the film is as follows.
That is, the membrane has a cylindrical shape extending from the discharge hole to the other opening end side of the side wall while narrowing the diameter thereof, and the shape of the top plate side portion of the entire length in the penetrating direction is the shape of the membrane itself. The curved shape is recessed in a circular arc shape toward the cylindrical center line.

  Furthermore, the hinge cap manufacturing method of the present invention closes the upper lid after forming a semifinished hinge cap with the upper lid open by injection molding. More specifically, in injection molding, as a semi-finished hinge cap, a cylindrical side wall to be mounted on the container body, a top plate that closes one open end of the side wall and has a discharge hole, and a thickness greater than the top plate A cap body that is a thin film and includes an annular film that narrows the diameter of a part of the discharge hole, the cap body having at least the outer peripheral part of the discharge hole and the film made of synthetic resin, and the top cover A plate and a projection that protrudes from the upper plate and includes an upper lid that includes a projection for entering the discharge hole until penetrating the membrane, and a hinge that connects the upper lid to the cap body are formed. After the hinge cap of this semi-finished product is formed by injection molding, the upper lid is closed, whereby the projection pushes the membrane, and thereby the inner peripheral shape of the membrane is plastically deformed into a shape in close contact with the projection.

  According to the hinge cap of the present invention, a membrane that is thinner than the top plate and has elasticity by synthetic resin is provided in a part of the discharge hole of the top plate, and the shape of the membrane is in the closed state of the top cover. Of these, the inner peripheral shape is the same intimate shape as the outer peripheral shape of the protrusions, so that sealing is obtained. In addition, since the membrane is thin and elastically deformable, and has a similar shape that is the same as or reduced in close contact with the open state of the upper lid, the frictional resistance between the membrane and the protrusion when opening and closing the upper lid is made as small as possible. It is possible to prevent the deterioration of the sealing performance due to opening and closing of the upper lid as much as possible.

  Further, when the upper lid is closed, if the hinge cap has a gap formed between the protrusion and the discharge hole over the entire circumference in the circumferential direction, the protrusion does not touch the discharge hole when the upper cover is opened and closed. The frictional resistance when opening and closing the upper lid can be reduced.

  Further, according to the manufacturing method of the hinge cap of the present invention, by closing the upper lid, the protrusion pushes the film, and thereby the inner peripheral shape of the film is plastically deformed into a shape in close contact with the protrusion. The shapes of the surfaces in contact with each other coincide with each other, and it is possible to absorb the dimensional variation for each product generated in the discharge hole and the protrusion.

(A) (b) (c) is a left side view, a bottom view, and a front view showing a hinge cap in a closed state. It is the II-II sectional view taken on the line of FIG. 1, and the principal part enlarged view is used together. It is a top view of the hinge cap of an open state. FIG. 4 is a sectional view taken along line IV-IV in FIG. It is the top view of the hinge cap in the mold open state immediately after shaping | molding, and the principal part enlarged view is used together.

  The hinge cap 1 according to the first embodiment of the present invention is an integrally molded product made of synthetic resin, and as shown in FIGS. 1 to 4, a cap body 2 to be attached to a container body (not shown), and a cap body 2. The upper cover 3 that opens and closes, the hinge 4 that connects the upper cover 3 to the cap body 2 so as to be openable and closable, and the elastic body 5 that applies an opening force and a closing force to the upper cover 3. In addition, the container main body is a bottomed cylindrical shape as an example, and the mouth part is cylindrical. Below, each structure is demonstrated in detail by making the closed state of the upper cover 3 into a basic form.

  The cap body 2 includes a cylindrical side wall 21 to be attached to the mouth portion of the container body, a top plate 22 that closes an inner peripheral side of an upper end portion that is an opening end portion in one direction among the through directions of the side wall 21, and a top plate 22 is provided with a film 23 projecting from a part of the discharge hole 22a formed in the state 22 to narrow its diameter, and an inner peripheral wall 24 extending downward from the lower surface of the top plate 22 on the inner peripheral side of the side wall 21.

  The side wall 21 includes a cylindrical side wall main body 21a and a female screw portion as a connecting portion 21b that connects the side wall main body 21a to the mouth of the container main body. The female screw portion 21b protrudes spirally from the inner peripheral surface of the side wall main body 21a over the entire circumference. Moreover, the outer peripheral surface of the upper part of the side wall main body 21a is provided with a recessed portion 21d that is recessed toward the inside in the diameter direction in a part of the circumferential direction.

  The top plate 22 has a disk shape, and the outer periphery of the disk is continuous over the entire periphery of the upper end of the side wall body 21a. The top plate 22 is formed with a plurality of discharge holes 22a penetrating in the vertical direction, which is the thickness direction of the disk. Note that the outer peripheral edge of the top surface of the top plate 22 is stepped lower than the inner side, and this lower surface serves as a contact surface with the outer peripheral portion of the upper lid 3.

  The discharge hole 22a is circular in plan view, and has a tapered shape in which the diameter (inner diameter) decreases as it goes downward on the container body side. And the film | membrane 23 is formed in the lower end part of the discharge hole 22a. The discharge hole 22a is a portion not including the film 23. In the closed state of the upper lid 3, the inner diameter of the discharge hole 22a is larger than the outer diameter of a protrusion 32 described later (the outer diameter of the protrusion 32 in the portion located inside the discharge hole 22a) of the upper lid 3, and the discharge hole 22a A gap G that is continuous over the entire circumference in the circumferential direction is formed between the entire inner circumference of the projection and the entire outer circumference of the protrusion 32. The discharge hole 22a is a space that penetrates the top plate 22 and a cylindrical surface that forms the space. Therefore, the outer peripheral portion of the discharge hole 22a is a portion constituting the outside of the cylindrical surface, that is, a portion constituting the outside of the discharge hole 22a.

  The thickness of the film 23 is made thinner than the thickness of the top plate 22. More specifically, the thickness of the film 23 is less than half of the thickness of the top plate 22, preferably 1/5 or less. The membrane 23 has a cylindrical shape extending from the inner periphery of the lower end of the discharge hole 22a in the direction of narrowing the diameter and in the direction of the other opening end of the side wall 21. More specifically, the film 23 includes a portion 23 a on the top plate 22 side and a portion 23 b away from the top plate 22 in the entire length in the penetrating direction.

The shape of the portion 23a on the top plate 22 side is a curved shape that is recessed in a circular arc shape toward the cylindrical center line C that is the shape of the film 23 itself, and the center line C with respect to the inner surface of the discharge hole 22a. Projecting toward (inward) and stepped. In the illustrated example, the inner surface of the discharge hole 22a is tapered, so that it is inclined at a predetermined angle with respect to the cylindrical center line C described above. And the part 23a by the side of the top plate 22 is formed in the state which protrudes in the diameter direction inner side rather than the extension line D of this inclination direction. In other words, this inclination direction is a direction along the inner surface of the discharge hole 22a based on the thickness direction of the top plate 22, and the portion 23a on the top plate 22 side extends to the center line C with respect to the extension line D in this direction. Protrusively.
On the other hand, the shape of the portion 23b away from the top plate 22 is cylindrical, and this cylindrical shape is the same intimate shape or slightly reduced with respect to the outer peripheral surface of the protrusion 32 of the upper lid 3 when the upper lid 3 is closed. Similar shape. Further, when viewed from the direction in which the protrusion 32 enters the discharge hole 22a, the inner peripheral shape of the portion 23b away from the top plate 22 is the same close shape as the outer peripheral shape of the protrusion 32 in the closed state of the upper lid 3. In the open state of the upper lid 3, it is the same shape as the close contact shape or a similar shape slightly reduced. Therefore, the position of the center of the inner peripheral shape of the film 23 in the opened state and the closed state of the upper lid 3 coincides with the position of the center line C when viewed from the direction in which the protrusion 32 enters the film 23.

  The inner peripheral wall 24 is formed concentrically with the center of the side wall 21 with a space on the inner peripheral side with respect to the side wall 21. Further, the lower end of the inner peripheral wall 24 is positioned above the female screw portion 21b.

  The upper lid 3 includes an upper plate 31 that covers the top plate 22, a protrusion 32 that protrudes from the upper plate 31 toward the cap body 2 in the thickness direction, and enters and exits the discharge hole 22 a and the film 23. An upper frame 33 projecting from the entire circumference of the outer peripheral edge toward the cap body 2 side, and a flange 34 projecting from a part of the entire circumference of the upper frame 33 outward in the caliber direction.

  The protrusion 32 protrudes from the upper plate 31 toward the cap body 2 in the thickness direction, and the protrusion length is longer than that of the upper frame 33. In the closed state of the upper lid 3, the protrusion 32 penetrates the discharge hole 22 a of the top plate 22 and the inside of the film 23. Further, the protrusion 32 has a cylindrical shape having an outer peripheral surface as a cylindrical surface, and this cylindrical shape is the same in the opened state and the closed state of the upper lid 3. That is, the protrusion 32 has a cylindrical shape, but its outer diameter does not change with the film 23. Incidentally, the center line of the protrusion 32 coincides with the position of the center line C of the film when the upper lid 3 is closed. Note that there are a plurality of combinations of the discharge hole 22a and the film 23 continuous with the inner periphery of the discharge hole 22a and the protrusion 32 that enters and exits the discharge hole 22a and the film 23.

The upper plate 31 has a disk shape that is the same shape as the top plate 22. The upper frame 33 is formed in an annular shape along the entire outer periphery of the upper plate 31. This annular end surface is a contact surface to the outer peripheral edge of the top plate 22 of the cap body 2. Further, the upper frame 33 projects a collar 34 from the position corresponding to the recessed portion 21d of the side wall 21 toward the outer side in the aperture direction.
On the upper plate 31 and the upper frame 33, the hinge 4 and the elastic body 5 are arranged on the opposite side to the flange 34 in the circumferential direction. In order to arrange the elastic body 5, the upper plate 31 and the upper frame 33 are notched so that the ridges are also cut out from the outer peripheral portion of the upper plate 31 to the end surface of the upper frame 33 on the side opposite to the ridges 34. 31a is formed, and a part of the elastic body 5 is arranged in the space inside the notch 31a.

  The elastic body 5 has a plate shape, and more specifically, a plate shape that extends in a shape that is bent in an L shape. The elastic body 5 is formed such that the thickness of both ends of the entire length in the extending direction is thinner than the thickness of portions other than both ends. One end of the elastic body 5 in the extending direction is joined to the upper plate 31 at the back of the notch 31 a, and the other end of the elastic body 5 in the extending direction is joined to the outer peripheral surface of the side wall 21 of the cap body 2. ing.

  The hinge 4 joins the outer peripheral surface of the side wall 21 of the cap body 2 and the outer peripheral surface of the upper frame 33 of the upper lid 3, and the thickness of the intermediate portion in the length direction is thinner than the other portions. It can be refracted at the middle in the length direction. In other words, the hinge 4 has a shape in which both side portions of the entire length in the length direction are separately joined to the side wall 21 and the upper frame 33, and the upper lid is centered on the middle portion of the length in the length direction. 3 is rotated so that it can be opened and closed.

The manufacturing method of the above-described hinge cap 1 is as follows 1) to 5).
1) The fixed mold and the movable mold in the mold open state are clamped to form a cavity (space part) having the same shape as the hinge cap 1A of the semi-finished product shown in FIG. More specifically, the semi-finished hinge cap 1A substantially corresponds to the shape in which the hinge cap 1 shown in FIG. 1 rotates the upper lid 3 about the hinge 4 by 180 degrees. The half-finished hinge cap 1A is different in structure from the hinge cap 1 shown in FIG. The film 23A of the semi-finished hinge cap 1A has an annular (more specifically, annular) flat plate shape, and protrudes inward in the radial direction so as to narrow the diameter of the discharge hole 22a. A cavity including a space corresponding to the annular flat plate shape is formed by clamping. Thus, the cap body 2A of the semifinished hinge cap 1A is different from the cap body 2 of the hinge cap 1 shown in FIG.
2) Inject molten resin into the cavity.
3) After the molten resin is sufficiently cooled, the movable mold is moved away from the fixed mold to open the mold. If it does so, the hinge cap 1A of the semi-finished product shown in FIG. 5 is produced in the state fitted to a movable metal mold | die. As described above, in this state, the film 23A has an annular flat plate shape.
4) When the cap body 2 and the upper lid 3 protrude and are pushed out to the fixed mold side with a pin, the semi-finished hinge cap 1A is released from the fixed mold. Since the hinge cap 1A is an integrally molded product made of synthetic resin, the outer peripheral portion of the discharge hole 22a (the portion constituting the outside of the discharge hole 22a) and the membrane 23A are made of synthetic resin.
5) Finally, the upper cover 3 of the semi-finished hinge cap 1A is closed. This closing operation is performed by an automatic machine or manually. When the upper lid 3 is closed, the end surface of the upper frame 33 of the upper lid 3 and the outer peripheral edge of the top surface of the top plate 22 of the cap body 2 come into contact with each other, and the upper plate 31 of the upper lid 3 covers the top plate 22. The protrusion 32 penetrates 23A. While the upper lid 3 is closed, the upper lid 3 rotates about the hinge 4, and at this time, the protrusion 32 pushes the flat film 23A into the discharge hole 22a until it penetrates the film 23A. The protrusion 32 enters and thereby the film 23A is plastically deformed into a cylindrical shape whose diameter gradually decreases as it goes downward. Since the protrusion 32 pushes the film 23A to widen the diameter of the film 23A, the inner diameter of the film 23A in the annular shape before plastic deformation is smaller than the outer shape of the protrusion 32. In this way, the hinge cap 1 becomes a product. Since the cylindrical shape of the film 23 is formed by the protrusion 32, the outer peripheral surface of the protrusion 32 and the inner peripheral surface of the film 23 coincide with each other at the portion where the protrusion 32 and the film 23 are in contact with each other. The protrusion 32 and the film 23 are in close contact over the entire circumference in the circumferential direction.

  Since the hinge cap 1 of the present invention is manufactured by the above-described manufacturing method, when the upper cover 3 of the hinge cap 1 is opened, the film 23 that has already been plastically deformed maintains the cylindrical shape as described above. However, the cylindrical caliber of the membrane 23 is not changed when the upper lid 3 is closed and opened (in the same case), and is smaller when the upper lid 3 is open than when the upper lid 3 is closed. There is. This is determined by conditions such as the thickness of the film 23, the synthetic resin used as a raw material, the temperature of the hinge cap 1A of the semi-finished product when the upper lid 3 is closed, and the time until the upper lid 3 is opened. Incidentally, the temperature of the semi-finished hinge cap 1A (film 23A) when the upper lid 3 is closed is more likely to be plastically deformed when the temperature is higher than room temperature. The film 23 whose diameter is determined by these conditions has a close contact shape that is the same as the outer peripheral surface of the protrusion 32 or a similar shape in which the outer peripheral surface of the protrusion 32 is slightly reduced in the portion in close contact with the protrusion 32. In addition, in the closed state of the upper lid 3, the position of the film 23 and the position of the protrusion 32 are completely coincident with each other. In other words, the film 23 matches the position of the center line C between the open state of the upper lid 3 and the closed state. As described above, the dimensional variation of each product that cannot be avoided in the injection molding is absorbed by closing the upper lid 3 with respect to the film 23 and the protrusion 32 in both the position and the shape.

  The film 23 is plastically deformed because it is thinner than the top plate 22. Therefore, the film 23 is plastically deformed so as to match the shape of the protrusion 32 due to the elasticity of the synthetic resin. Therefore, in the hinge cap 1, the protrusion 32 and the film 23 are in intimate contact with each other over the entire circumference in the circumferential direction, so that sealing performance is obtained. Incidentally, in the film 23, a portion 23 b away from the top plate 22 is a cylindrical surface, and this cylindrical surface is a portion that closely contacts the entire circumference of the outer peripheral surface of the protrusion 32. Moreover, since the film 23 is thin and can be elastically deformed, the frictional resistance between the film 23 and the protrusion 32 when the upper lid 3 is opened and closed can be made as small as possible. Further, when the upper lid 3 is closed, a gap G is formed between the projection 32 and the discharge hole 22a over the entire circumference in the circumferential direction. Therefore, when the upper lid 3 is opened and closed, the projection 32 is formed in the discharge hole 22a. The frictional resistance when the upper lid 3 is opened and closed can be made as small as possible. Further, since the combination of the discharge hole 22a and the membrane 23 and a plurality of combinations of the projections 32 entering and exiting the discharge hole 22a and the membrane 23 is provided, when the upper lid 3 is opened and closed while discharging the contents of the container body in a wide range. The frictional resistance can be made as small as possible. The hinge cap 1 can close the upper lid 3 without the projection 32 touching the discharge hole 22a, and the projection 32 only uses the elastic deformation of the membrane 23 itself when penetrating the thin membrane 23. Can be closed with a single operation.

  The present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the spirit of the present invention. For example, the shape of the protrusion 32 is not limited to a cylindrical shape, and may be a rectangular tube shape or other shapes, and the shape of the film 23 is changed according to the shape of the protrusion 32. The shape of the discharge hole 22a is not limited to a circle, but may be a polygon or other shapes. Furthermore, the cap body 2 is not limited to a cylindrical shape, and may be a rectangular tube shape or other shapes. The upper lid 3 is not limited to covering the entire upper surface of the top plate 22 but may cover a part of the upper surface of the top plate 22. Further, the frame without the upper frame 33 or the ridge 34 may be used.

  In the above embodiment, the hinge cap 1 is entirely made of synthetic resin. However, the hinge cap 1 is not limited to this, and at least the portion surrounding the discharge hole 22a, that is, the outer peripheral portion of the discharge hole 22a and the film 23 are formed. It may be made of synthetic resin, and other parts may be made of other materials such as metal.

1 Hinge cap 1A Hinge cap of semi-finished product 2 Cap body 2A Cap body (semi-finished product)
21 side wall 21a side wall body 21b connecting part (female screw part)
21d hollow part 22 top plate 22a discharge hole 23 film 23A film (semi-finished product)
23a Part on the top plate side 23b Part away from the top plate C Center line D Extension line G Gap 24 Inner peripheral wall 3 Upper lid 31 Upper plate 31a Notch 32 Projection 33 Upper frame 34 ４ 4 Hinge 5 Elastic body

Claims (6)

A cylindrical side wall to be attached to the container body, a top plate that closes one open end of the side wall and has a discharge hole, and a thickness that is thinner than the top plate and narrows from a part of the discharge hole. A cap body including a membrane to be
An upper lid that covers the top plate, and an upper lid that includes a projection that protrudes from the upper plate and enters the discharge hole until it penetrates the membrane;
A hinge for connecting the upper lid to the cap body,
The outer peripheral part of the discharge hole and the membrane of the top plate are made of at least synthetic resin
The inner peripheral shape of the membrane shape is the same close shape as the outer peripheral shape of the protrusion in the closed state of the upper lid when viewed from the direction in which the protrusion enters the discharge hole, and the same or reduced size as the close shape in the open state of the upper lid. A hinge cap characterized by a similar shape.   2. The hinge cap according to claim 1, wherein a gap is formed between the discharge hole and the protrusion over the entire circumference in the closed state of the upper lid.   The membrane is characterized in that the shape of the portion on the top plate side of the total length in the penetrating direction is a shape protruding inward from the extension line in the direction along the inner surface of the discharge hole based on the thickness direction of the top plate. The hinge cap according to claim 1 or 2.   The hinge cap according to claim 1, 2, or 3, wherein the position of the center of the inner peripheral shape of the membrane is the same when the upper lid is in the open state and in the closed state.   The membrane has a cylindrical shape that extends from the discharge hole to the other opening end side of the side wall while narrowing its diameter, and the top plate side portion of the entire length in the penetrating direction is a cylinder that is the shape of the membrane itself. The hinge cap according to claim 1, 2, 3, or 4, wherein the hinge cap has a curved shape that is recessed in a circular arc shape toward the center line. A cylindrical side wall to be mounted on the container body, a top plate that closes one open end of the side wall and has a discharge hole, and an annular film that is thinner than the top plate and narrows the diameter of a part of the discharge hole A cap body that includes at least the outer peripheral portion of the discharge hole and the membrane of the top plate made of a synthetic resin.
An upper cover that covers the top plate, and an upper lid that includes a protrusion that protrudes from the upper plate and enters the discharge hole until it penetrates the membrane;
After forming a hinge cap of a semi-finished product comprising a hinge connecting the upper lid to the cap body by injection molding,
A method of manufacturing a hinge cap, characterized in that, by closing the upper lid, the projection pushes the membrane, whereby the inner peripheral shape of the membrane is plastically deformed into a shape in close contact with the projection.

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