JP7325246B2 - Cap and cap manufacturing method - Google Patents

Description

The present invention relates to caps and methods of making caps.

BACKGROUND ART Conventionally, a cap described in Patent Document 1 below has been known. This cap is attached to the mouth of a container body in which contents are contained, and includes a topped cylindrical cap body having a discharge hole formed in the top wall, and a slit valve assembled to the cap body. ing.

JP 2019-64680 A

However, the conventional cap has room for improvement in reducing the number of parts.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a cap capable of preventing an increase in the number of parts even if it has a slit.

In order to solve the above problems, the present invention proposes the following means.
The cap according to the present invention comprises a topped cylindrical cap body that is attached to the mouth of a container body in which contents are contained and has a discharge hole formed in the ceiling wall, and is formed integrally with the cap body, an elastic piece that closes the discharge hole; the elastic piece has a slit that penetrates the elastic piece in the vertical direction and is opened and closed by elastic deformation of the elastic piece; The outer peripheral edge of the elastic piece is thinner than the wall portion, and the outer peripheral edge of the elastic piece is connected to the inner peripheral surface of the discharge hole. a stepped portion that is continuous with the upper or lower surface of the top wall portion and is larger in the vertical direction than the elastic piece is formed, the outer peripheral portion is embedded in the cap body, and the central portion is exposed upward through the discharge hole An elastic film is further provided, and the elastic piece supports a central portion of the elastic film in a state of covering from below, and the slit extends vertically through the elastic film and the elastic piece and extends through the elastic film and the elastic piece. It opens and closes by elastically deforming the pieces .

With the cap attached to the container body, the elastic piece is elastically deformed when the internal pressure of the container body or the flow pressure of the contents acts on the elastic piece. As a result, the slit is widened and the content is discharged from the discharge hole. When the internal pressure or fluid pressure stops acting on the elastic piece, the elastic piece is restored and deformed to close the slit.
According to this cap, the elastic piece is formed integrally with the cap body. Therefore, a cap with a slit can be obtained without increasing the number of parts.
A stepped portion is formed at least one of the upper and lower portions of the outer peripheral edge of the elastic piece. Moreover, the stepped portion is vertically larger than the elastic piece. Therefore, when the contents are discharged from the discharge hole, the contents flow along the stepped portion, and the discharge of the contents can be stabilized.
An elastic piece supports the elastic membrane. Thereby, the elastic membrane can be reinforced by the elastic piece. Therefore, for example, compared to a cap having only an elastic membrane without an elastic piece, it is possible to suppress excessive deformation of the elastic membrane due to the action of the internal pressure of the container body and the flow pressure of the contents. That is, it is possible to stabilize the deformation of the elastic pieces and the elastic film when the internal pressure of the container body and the fluid pressure of the contents act.

A thickness of the elastic piece may be 0.05 mm or more and 0.2 mm or less.

The elastic piece has a thickness of 0.05 mm or more and 0.2 mm or less. Therefore, ejection can be reliably stabilized.
That is, when the thickness of the elastic piece is less than 0.05 mm, the elastic force (restoring deformation force) of the elastic piece becomes too low. Therefore, when the elastic pieces are restored and deformed after the contents are discharged, the liquid of the contents is not easily drained, and the contents tend to remain on the elastic pieces. As a result, ejection becomes unstable.
On the other hand, if the thickness of the elastic piece exceeds 0.2 mm, the elastic force (restoring deformation force) of the elastic piece becomes too high. Therefore, high internal pressure and fluid pressure are required for ejection, and stable ejection becomes difficult.

The stepped portion may be formed above the outer peripheral edge of the elastic piece and connected to the upper surface of the ceiling wall portion.

A stepped portion is formed above the outer peripheral edge of the elastic piece and continues to the upper surface of the ceiling wall portion. Therefore, the flow of the content after passing through the elastic piece (slit) can be stabilized by the stepped portion. Therefore, it is possible to more stably discharge the contents.

The ceiling wall portion includes a ring portion arranged on the mouth portion, and a protruding portion protruding from an inner peripheral edge of the ring portion and formed with the discharge hole. It may be embedded in the ring portion and the raised portion.

The perimeter of the elastic membrane is embedded in the ring and ridges. Thereby, the elastic membrane can be strongly fixed to the cap body.

The elastic membrane and the elastic piece may be formed in a spherical shape convex downward.

The elastic membrane and the elastic piece are formed in a spherical shape convex downward. As a result, it is possible to improve the liquid-drainability of the contents when the elastic membrane and the elastic pieces are restored and deformed.

The cap according to the present invention is attached to the mouth of a container body in which contents are contained, and is integrally made of the same material as the cap body and a topped cylindrical cap body having a discharge hole formed in the top wall. an elastic piece formed to block the discharge hole, wherein the elastic piece has a slit vertically penetrating through the elastic piece and opened and closed by elastic deformation of the elastic piece; is thinner than the top wall portion, the outer peripheral edge of the elastic piece is connected to the inner peripheral surface of the discharge hole, and at least one of the upper and lower outer peripheral edges of the elastic piece has an inner wall of the discharge hole. A stepped portion is formed by the peripheral surface, continues to the upper surface or the lower surface of the top wall portion and is larger in the vertical direction than the elastic piece. The cap further comprises an elastic membrane exposed to a portion, wherein the inner peripheral edge of the elastic membrane is arranged above or below the outer peripheral edge of the elastic piece, wherein the cap main body, the elastic piece, and the cap An intermediate molded product in which an unprocessed elastic membrane having an outer peripheral portion and a central portion is embedded in a connecting body including a portion to be removed which is formed integrally with a main body and arranged in a portion to be formed of the discharge hole, The central portion of the elastic film before processing is removed together with the portion to be removed, and the outer peripheral portion of the elastic film before processing remains to become the elastic film.
The cap according to the present invention comprises a topped cylindrical cap body that is attached to the mouth of a container body in which contents are contained and has a discharge hole formed in the ceiling wall, and is formed integrally with the cap body, an elastic piece that closes the discharge hole; the elastic piece has a slit that penetrates the elastic piece in the vertical direction and is opened and closed by elastic deformation of the elastic piece; The outer peripheral edge of the elastic piece is thinner than the wall portion, and the outer peripheral edge of the elastic piece is connected to the inner peripheral surface of the discharge hole. The cap is formed with a stepped portion that continues to the upper surface or the lower surface of the top wall portion and is larger in the vertical direction than the elastic piece, wherein the cap includes the cap main body, the elastic piece, and the cap. A portion to be removed formed integrally with a main body and arranged in a portion to be formed of the discharge hole is formed by removing the portion to be removed from a connecting body, and the connecting body includes at least the cap. An elastic film is provided to support the elastic piece, which is embedded in the connecting body during molding of the elastic piece, and the thickness of the elastic piece is 0.05 mm or more and 0.2 mm or less.

A cap manufacturing method according to the present invention is a cap manufacturing method for manufacturing the cap, comprising: the cap main body; the elastic piece; an intermediate molded product forming step of forming an intermediate molded product in which the elastic film is embedded in a connecting body having a portion to be removed, and the discharge hole by removing the portion to be removed from the intermediate molded product. and a slit forming step of forming the slit.

According to this method, the cap described above can be reliably manufactured.

In the step of forming the intermediate molded article, the intermediate molded article may be formed by injection molding the connecting body using the elastic film as an insert, and the gate mark of the connecting body may be formed in the portion to be removed. .

A gate trace of the connector is formed in the portion to be removed. Therefore, by removing the portion to be removed from the intermediate molding in the removing step, no gate mark remains on the cap. Therefore, for example, the appearance of the cap can be improved.

ADVANTAGE OF THE INVENTION According to this invention, even if it is provided with a slit, an increase in a number of parts can be prevented.

1 is a longitudinal cross-sectional view showing a portion of a capped container including a cap according to one embodiment of the present invention; FIG. 2 is an enlarged view of the longitudinal sectional view shown in FIG. 1; FIG. FIG. 2 is a vertical cross-sectional view showing a state in which the cap shown in FIG. 1 is unfolded; Figure 4 is a top view of the cap shown in Figure 3; FIG. 2 is a vertical cross-sectional view of a first intermediate molded product formed in the manufacturing process of the cap shown in FIG. 1; FIG. 6 is a top view of the first intermediate molding shown in FIG. 5; 6A and 6B are diagrams for explaining a removing step of removing a portion to be removed from the first intermediate molded product shown in FIG. 5; FIG. 3 is a vertical cross-sectional view of a second intermediate molded product formed in the process of manufacturing the cap shown in FIG. 1; FIG. 9 is a top view of the second intermediate product shown in FIG. 8; FIG. 4 is a vertical cross-sectional view showing part of a capped container including a cap according to a first modified example of the present invention; It is a longitudinal cross-sectional view of the cap which concerns on the 2nd modification of this invention.

Hereinafter, a capped container 2 including a cap 1 according to one embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1 , the capped container 2 includes a container body W and a cap 1 . The container main body W contains contents. A mouth portion W1 of the container body W is formed with a male screw portion to which the cap 1 is screwed. The opening W1 of the container body W is closed with a film F. The film F is detachably fixed to the upper opening edge of the opening W1. Note that the film F may be breakable. Moreover, the film F and the male screw portion may be omitted.

As shown in FIGS. 1 to 4, the cap 1 of the present embodiment includes a topped cylindrical cap body 11 attached to the mouth portion W1 of the container body W in which the contents are stored, and A lid 13 that opens and closes the ceiling wall 12 and a hinge 14 that connects the cap main body 11 and the lid 13 are provided. The cap body 11, lid body 13, and hinge portion 14 are integrally formed of the same material.

In the illustrated example, the lid body 13 is formed in a capped cylindrical shape, and the lid body 13 and the cap main body 11 are arranged coaxially with the common axis. Hereinafter, this common axis will be referred to as the central axis O, the direction intersecting the central axis O as seen from the axial direction along the central axis O will be referred to as the radial direction, and the direction that goes around the central axis O will be referred to as the circumferential direction. In the axial direction, the top wall portion 15 side of the lid body 13 is referred to as the upper side, and the open end side of the peripheral wall portion 16 of the cap body 11 is referred to as the lower side.

A female screw portion is formed on the inner peripheral surface of the peripheral wall portion 16 of the cap body 11 to be screwed into the mouth portion W1. Note that the cap main body 11 may be fitted to the opening W1 by plugging.
The lower surface of the top wall portion 12 of the cap main body 11 is in continuous and close contact with the upper end opening edge (film F) of the mouth portion W1 over the entire circumferential direction. The tight contact between the cap main body 11 and the mouth portion W1 ensures a sealing property between the cap main body 11 and the mouth portion W1.

The top wall portion 12 includes a ring portion 17 arranged on the mouth portion W1 and a ridged cylindrical protuberance 18 protruding from the inner peripheral edge of the ring portion 17 . The raised portion 18 is arranged coaxially with the central axis O and formed in a cylindrical shape. The protuberance 18 has a smaller diameter as it goes upward.

A discharge hole 20 is formed in the top wall 19 of the raised portion 18 . The discharge hole 20 axially penetrates the top wall 19 . The discharge hole 20 is formed in a circular shape coaxial with the central axis O in plan view seen from the axial direction. In the illustrated example, the outer diameter of the discharge hole 20 is smaller than the outer diameter of the top wall 19, and the raised portion 18 is formed in a cylindrical shape with a top. It is the same as the outer diameter, in other words, the raised portion 18 may have a cylindrical shape without the top wall 19 (a cylindrical shape with only the peripheral wall 21).

A fitting tube 24 is formed on the lower surface of the top wall portion 15 of the lid body 13 so as to protrude downward and is detachably fitted to the peripheral wall 21 of the raised portion 18 . The inner peripheral surface of the fitting cylinder 24 is in close contact with the outer peripheral surface of the peripheral wall of the raised portion 18 over the entire circumferential direction.

As shown in FIGS. 1 and 2, the cap 1 further includes an elastic membrane 25 and an elastic piece 26 in this embodiment.
The elastic film 25 is made of, for example, a thermoplastic resin (resin material) such as EVOH (ethylene-vinyl alcohol copolymer) or nylon. An outer peripheral portion 27 of the elastic membrane 25 is embedded in the cap body 11 . A central portion 28 of the elastic membrane 25 is exposed upward through the discharge hole 20 . The elastic membrane 25 is located above the lower surface of the top wall 19 of the raised portion 18 .

As shown in FIG. 2, the outer peripheral portion 27 of the elastic membrane 25 is embedded in the ring portion 17 and the raised portion 18 . An outer peripheral edge 27 a of the elastic film 25 (the outermost portion of the elastic film 25 ) is positioned inside the ring portion 17 . The outer peripheral portion 27 of the elastic membrane 25 first extends in the radial direction and passes through the ring portion 17 as it goes from the radially outer side to the inner side. It extends radially again past the top wall 19 of the ridge 18 . The elastic membrane 25 is arranged closer to the bottom surface of the ring portion 17 than to the top surface of the ring portion 17 . The elastic membrane 25 is arranged on the peripheral wall 21 of the raised portion 18 closer to the inner peripheral surface than to the outer peripheral surface of the peripheral wall 21 . The elastic membrane 25 is arranged on the top wall 19 of the protuberance 18 closer to the bottom surface of the top wall 19 than to the top surface.

The elastic membrane 25 extends along the lower surface of the ring portion 17 , the inner peripheral surface of the peripheral wall 21 of the raised portion 18 and the lower surface of the top wall 19 . Here, the reason why the elastic film 25 extends along the lower surface of the ring portion 17 is not only when the elastic film 25 is completely parallel to the lower surface of the ring portion 17, but also when the elastic film 25 and the ring portion 17 extend. This includes the case where the distance to the lower surface is substantially the same regardless of the position in the radial direction (within 10% of the minimum distance). Similarly, the elastic film 25 extends along the inner peripheral surface of the peripheral wall 21 of the raised portion 18 and the elastic film 25 extends along the lower surface of the top wall 19 .

The elastic piece 26 is integrally formed of the same material as the cap body 11 . The elastic piece 26 is integrally formed with the cap main body 11, the lid 13, and the hinge portion 14, for example, from a thermoplastic resin (resin material) such as PP (polypropylene) or PE (polyethylene). In the illustrated example, the elastic membrane 25 and the elastic piece 26 are made of different materials.

The elastic piece 26 supports the elastic membrane 25 while covering it from below. The elastic piece 26 is formed in a plate shape facing the axial direction. The outer peripheral edge of the elastic piece 26 is connected to the inner peripheral surface of the discharge hole 20 . The upper surface of the elastic piece 26 is in contact (surface contact) with the lower surface of the elastic film 25 . The elastic piece 26 and the elastic film 25 are laminated together to form a laminate. The upper surface of the elastic piece 26 may or may not be fixed to the lower surface of the elastic film 25 . The elastic piece 26 and the elastic film 25 may be made of a material that is highly compatible with each other, or may be made of a material that is slightly compatible with each other.

The elastic piece 26 and the elastic film 25 (laminate) close the discharge hole 20 . The elastic piece 26 and the elastic film 25 (laminate) are thinner than the top wall portion 12 . The thickness of the elastic film 25 and the entire elastic film 25 (thickness of the laminate, size in the axial direction of the laminate) can be, for example, 50 μm to 200 μm. The thickness of the elastic piece 26 may be the same as the thickness of the elastic membrane 25 , and the elastic piece 26 may be thicker or thinner than the elastic membrane 25 . In this embodiment, the thickness t of the elastic piece 26 is 0.05 mm or more and 0.2 mm or less, and is thinner than the ceiling wall portion 12 .

A stepped portion 20a is formed on at least one of the upper side and the lower side of the outer peripheral edge of the elastic piece 26 . The stepped portion 20 a is formed by the inner peripheral surface of the discharge hole 20 and continues to the upper surface or the lower surface of the ceiling wall portion 12 . In the illustrated example, the upper surface of the elastic piece 26 (the upper surface of the laminate) is located below the upper surface of the top wall 19 (top wall portion 12) of the raised portion 18, and is stepped above the outer peripheral edge of the elastic piece 26. A portion 20a is formed. The stepped portion 20 a continues to the elastic membrane 25 from above and to the upper surface of the top wall 19 . The step portion 20a is larger than the elastic piece 26 in the vertical direction. In other words, the height T of the stepped portion 20 a is greater than the thickness t of the elastic piece 26 .

In the illustrated example, the lower surface of the elastic piece 26 is flush with the lower surface of the top wall 19 of the raised portion 18, and no stepped portion is formed below the outer peripheral edge of the elastic piece 26. As shown in FIG. However, the lower surface of the elastic piece 26 may be positioned above the lower surface of the top wall 19 so that a stepped portion continuing to the lower surface of the top wall 19 may be formed. In this case, the stepped portion 20a may not be formed above the outer peripheral edge of the elastic piece 26 .

As shown in FIG. 4, slits 30 are formed in the elastic membrane 25 and the elastic pieces 26 . The slit 30 penetrates the elastic film 25 and the elastic piece 26 in the vertical direction, and opens and closes when the elastic film 25 and the elastic piece 26 are elastically deformed. In plan view in the axial direction, the slits 30 have the same shape in the elastic membrane 25 and the elastic pieces 26, respectively. In plan view, the slits 30 are formed radially around the central axis O. As shown in FIG. In the illustrated example, the slit 30 has a cross shape in a plan view, but it may be changed to another shape such as a straight line shape in a plan view depending on the discharge mode and the properties of the contents.

Next, a method of manufacturing the cap 1 (manufacturing method of the cap 1) will be described.
In this manufacturing method, first, an intermediate molded article forming step of forming a first intermediate molded article 40 (intermediate molded article) as shown in FIGS. 5 and 6 is performed. The first intermediate molded product 40 includes a connecting body 45 and the elastic membrane 25 embedded in the connecting body 45 . The connecting body 45 includes the cap main body 11 , the lid body 13 , the hinge portion 14 , and the portion to be removed 41 .

The connecting body 45 (the cap body 11, the lid body, the hinge portion, and the portion to be removed 41) is integrally formed of the same material (for example, a thermoplastic resin (resin material) such as PP (polypropylene) or PE (polyethylene)). ing. The connecting body 45 is an injection-molded body, and in the intermediate molding forming step, the first intermediate molding 40 is formed by injection-molding the connecting body 45 using the elastic membrane 25 as an insert.

The part to be removed 41 is arranged in the part to be formed of the discharge hole 20 . In other words, the discharge hole 20 is formed by removing the portion to be removed 41 from the connecting body 45 of the first intermediate molded product 40 . A gate mark 43 is formed in the portion to be removed 41 . In the illustrated example, the part to be removed 41 is provided with a protrusion 42 that protrudes upward. The gate mark 43 is provided at the tip of the protrusion 42 .

After the molding process, as shown in FIGS. 7 to 9 , a removal process is performed to remove the portion to be removed 41 from the first intermediate molded product 40 to form the discharge hole 20 .
In the removing step, first, as shown in FIG. 7, the receiving jig 51 is inserted into the cap body 11 from below. The receiving jig 51 is rod-shaped with a flat upper end surface. The outer diameter of the receiving jig 51 is the same as the outer diameter of the top wall 19 of the raised portion 18 . The receiving jig 51 is inserted into the raised portion 18 and supports the top wall 19 (the portion to be removed 41) of the raised portion 18 from below.

In the removing step, the punching blade 52 is opposed to the portion to be removed 41 from above. The punching blade 52 is formed in a cylindrical shape. An end face of the punching blade 52 is a blade portion 53 capable of cutting the connecting body 45 . The punching blade 52 is approached from above the cap body 11 while being coaxially arranged with the cap body 11 to the first intermediate molded product 40 supported by the receiving jig 51 . The part to be removed 41 is cut off from the raised part 18 by pressing the blade part 53 of the punching blade 52 against the connecting body 45 (the part to be removed 41 ).
In this way, by removing the portion to be removed 41 from the first intermediate molded product 40 in the removing step, the gate mark 43 does not remain on the cap 1 . Therefore, for example, the appearance of the cap 1 can be improved.

After that, as shown in FIGS. 8 and 9, the part to be removed 41 is separated from the raised part 18 to form the second intermediate molded product 60 . The second intermediate molded product 60 is obtained by removing the part to be removed 41 from the first intermediate molded product 40 .
Finally, the cap 1 is formed by performing a slit forming step of forming slits 30 in the elastic film 25 and the elastic pieces 26 .

As described above, according to the container with cap 1 according to the present embodiment, when the internal pressure of the container body and the flow pressure of the contents act on the elastic pieces 26, the elastic pieces 26 and the elastic film 25 are elastically deformed. As a result, the slit 30 is widened and the content is discharged from the discharge hole 20 . When the action of the internal pressure or fluid pressure on the elastic piece 26 stops, the elastic piece 26 and the elastic film 25 are restored and deformed to close the slit 30 .

In the cap 1 , the elastic membrane 25 is embedded in the cap body 11 and the elastic piece 26 is formed integrally with the cap body 11 . Therefore, the cap 1 having the slit 30 can be obtained without increasing the number of parts.

Also, the elastic piece 26 supports the elastic membrane 25 . Thereby, the elastic membrane 25 can be reinforced by the elastic pieces 26 . Therefore, for example, compared to the cap 1 having only the elastic membrane 25 without the elastic piece 26, it is possible to suppress excessive deformation of the elastic membrane 25 due to the action of the internal pressure of the container body W and the flow pressure of the contents. . That is, deformation of the elastic piece 26 and the elastic film 25 can be stabilized when the internal pressure of the container body W and the fluid pressure of the contents act.

A peripheral portion 27 of the elastic membrane 25 is embedded in the ring portion 17 and the raised portion 18 . Thereby, the elastic membrane 25 can be strongly fixed to the cap main body 11 .

A stepped portion 20 a is formed on at least one of the upper and lower portions of the outer peripheral edge of the elastic piece 26 . Moreover, the step portion 20a is larger than the elastic piece 26 in the vertical direction. Therefore, when the contents are discharged from the discharge hole 20, the contents flow along the stepped portion 20a, and the discharge of the contents can be stabilized.

A stepped portion 20 a is formed above the outer peripheral edge of the elastic piece 26 and continues to the upper surface of the top wall portion 12 . Therefore, the flow of the content after passing through the elastic piece 26 (slit) can be stabilized by the stepped portion 20a. Therefore, it is possible to more stably discharge the contents.

The thickness of the elastic piece 26 is 0.05 mm or more and 0.2 mm or less. Therefore, ejection can be reliably stabilized.
That is, when the thickness of the elastic piece 26 is less than 0.05 mm, the elastic force (restoring deformation force) of the elastic piece 26 becomes too low. Therefore, when the elastic pieces 26 are restored and deformed after the contents are discharged, the contents are less likely to run out of liquid, and the contents tend to remain on the elastic pieces 26 . As a result, ejection becomes unstable.
On the other hand, if the thickness of the elastic piece 26 exceeds 0.2 mm, the elastic force (restoring deformation force) of the elastic piece 26 becomes too high. Therefore, high internal pressure and fluid pressure are required for ejection, and stable ejection becomes difficult.

The technical scope of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

For example, like a cap 1A (container with cap 2A) according to a modified example shown in FIG. 10, the elastic membrane 25 and the elastic piece 26 may be formed in a spherical shape convex downward. In this case, when the elastic membrane 25 and the elastic pieces 26 are restored and deformed, it is possible to improve the liquid-drainability of the contents.

Furthermore, like the cap 1B according to the modification shown in FIG. 11, the elastic membrane 25 may not have a portion corresponding to the central portion . In this case, only a portion of the elastic film 25 corresponding to the outer peripheral portion 27 remains. In other words, the elastic membrane 25 is annularly formed and embedded in the cap body 11, and the inner peripheral edge 25a of the elastic membrane 25 is exposed to the stepped portion 20a. The inner peripheral edge 25a of the elastic film 25 is formed above the outer peripheral edge of the elastic piece 26, and in the illustrated example, the inner peripheral edge 25a continues to the elastic piece 26 from above.
Such a cap 1B can be manufactured by removing the central portion 28 of the elastic membrane 25 together with the portion to be removed 41 in the removing step of the manufacturing method described above. By burying the elastic film 25 to be removed in the connecting body 45 in this manner, the thin elastic piece 26 can be easily formed. That is, for example, when the thickness of the elastic piece 26 is 0.2 mm or less, it is difficult to mold only the elastic piece 26 by injection molding.

The manufacturing method of the cap 1 is not limited to the method described in the above embodiment.
The ceiling wall portion 12 may not have the raised portion 18, and the ceiling wall portion 12 may be flat.
The hinge portion 14 may be omitted. The lid 13 may be omitted.

In addition, it is possible to appropriately replace the constituent elements in the above-described embodiment with well-known constituent elements without departing from the spirit of the present invention, and the modifications described above may be combined as appropriate.

Here, a verification test was conducted on the thickness t of the elastic piece 26 .
In the verification test, five types of caps 1B according to the second modified example shown in FIG. The thickness t of the elastic piece 26 is five types of 0.3 mm, 0.2 mm, 0.08 mm, 0.05 mm, and 0.03 mm. For each cap 1B, a sensory evaluation was made as to the degree of realization of stable ejection as the ejection property. Table 1 shows the results.

In the column of dischargeability and moldability (described later) in Table 1, "A" means good, "B" means good, and "C" means bad. From this result, it was confirmed that stable ejection can be realized when the ejection property is 0.2 mm or more and 0.05 mm or less.

Each cap 1B prepared in this verification test was manufactured by removing the central portion 28 of the elastic film 25 together with the portion to be removed 41 in the removing step, as described in the second modified example. Instead of this method, moldability was also confirmed when a cap of the same size was injection molded without embedding the elastic membrane 25 . The results are as shown in the Formability column of Table 1. It was confirmed that when the thickness t of the elastic piece 26 is 0.2 mm or less, it is difficult to injection-mold the elastic piece 26 without embedding the elastic film 25 therein.
However, for example, it is possible to form the elastic piece 26 with a thickness of 0.2 mm or less by setting the thickness of the portion corresponding to the elastic piece 26 to 0.3 mm or more and cutting a part of that portion. is. This verification test is not intended to limit the manufacturing method of the cap 1B.

1 Cap 11 Cap body 12 Top wall 15 Top wall 17 Ring 18 Protrusion 20 Discharge hole 25 Elastic membrane 26 Elastic piece 27 Peripheral portion 28 Central portion 30 Slit 40 First intermediate product (intermediate product)
41 Part to be removed 43 Gate mark 45 Connected body W Container body W1 Mouth part

Claims (9)

a topped cylindrical cap body that is attached to the mouth of a container body in which the contents are contained and has a discharge hole formed in the top wall;
an elastic piece that is integrally formed with the cap body and closes the discharge hole;
The elastic piece is formed with a slit that penetrates the elastic piece in the vertical direction and opens and closes when the elastic piece is elastically deformed,
The elastic piece is thinner than the top wall portion, and the outer peripheral edge of the elastic piece is connected to the inner peripheral surface of the discharge hole,
At least one of the upper side and the lower side of the outer peripheral edge of the elastic piece is formed by the inner peripheral surface of the discharge hole, is connected to the upper surface or the lower surface of the ceiling wall portion, and is vertically larger than the elastic piece. part is formed,
an elastic membrane having an outer peripheral portion embedded in the cap body and a central portion exposed upward through the discharge hole;
The elastic piece supports the central portion of the elastic membrane while covering it from below,
The slit extends vertically through the elastic film and the elastic piece, and is opened and closed by elastic deformation of the elastic film and the elastic piece. 2. The cap according to claim 1, wherein the elastic piece has a thickness of 0.05 mm or more and 0.2 mm or less. 3. The cap according to claim 1, wherein the stepped portion is formed above the outer peripheral edge of the elastic piece and continues to the upper surface of the top wall portion. The top wall portion includes a ring portion arranged on the mouth portion, and a raised portion rising from an inner peripheral edge of the ring portion and having the discharge hole formed thereon,
2. The cap according to claim 1, wherein the outer peripheral portion of said elastic membrane is embedded in said ring portion and said raised portion. 5. The cap according to claim 1, wherein said elastic membrane and said elastic piece are formed in a spherical shape convex downward. a topped cylindrical cap body that is attached to the mouth of a container body in which the contents are contained and has a discharge hole formed in the top wall;
an elastic piece that is integrally formed of the same material as the cap body and closes the discharge hole;
The elastic piece is formed with a slit that penetrates the elastic piece in the vertical direction and opens and closes when the elastic piece is elastically deformed,
The elastic piece is thinner than the top wall portion, and the outer peripheral edge of the elastic piece is connected to the inner peripheral surface of the discharge hole,
At least one of the upper side and the lower side of the outer peripheral edge of the elastic piece is formed by the inner peripheral surface of the discharge hole, is connected to the upper surface or the lower surface of the ceiling wall portion, and is vertically larger than the elastic piece. part is formed,
further comprising an elastic membrane formed in an annular shape and embedded in the cap body, the inner peripheral edge of which is exposed to the stepped portion;
The inner peripheral edge of the elastic membrane is a cap arranged above or below the outer peripheral edge of the elastic piece,
A connecting body including the cap body, the elastic piece, and a portion to be removed formed integrally with the cap body and arranged in the portion to be formed of the discharge hole, and having an outer peripheral portion and a central portion before processing. A cap in which a center portion of the elastic film before processing is removed together with the portion to be removed from the intermediate molded product in which the elastic film is embedded, and the outer peripheral portion of the elastic film before processing remains and becomes the elastic film. . a topped cylindrical cap body that is attached to the mouth of a container body in which the contents are contained and has a discharge hole formed in the top wall;
an elastic piece that is integrally formed with the cap body and closes the discharge hole;
The elastic piece is formed with a slit that penetrates the elastic piece in the vertical direction and opens and closes when the elastic piece is elastically deformed,
The elastic piece is thinner than the top wall portion, and the outer peripheral edge of the elastic piece is connected to the inner peripheral surface of the discharge hole,
At least one of the upper side and the lower side of the outer peripheral edge of the elastic piece is formed by the inner peripheral surface of the discharge hole, is connected to the upper surface or the lower surface of the ceiling wall portion, and is vertically larger than the elastic piece. A cap formed with a portion,
In the cap, the part to be removed is removed from a connecting body including the cap body, the elastic piece, and the part to be removed formed integrally with the cap body and arranged in the part to be formed of the discharge hole. It is molded by being
The connecting body is provided with an elastic membrane that supports the elastic piece and is embedded in the connecting body at least when the cap is molded,
The cap, wherein the elastic piece has a thickness of 0.05 mm or more and 0.2 mm or less. A cap manufacturing method for manufacturing the cap according to any one of claims 1 to 6,
Intermediate molding in which the elastic membrane is embedded in a connecting body comprising the cap body, the elastic piece, and a part to be removed formed integrally with the cap body and arranged in the part to be formed of the discharge hole. an intermediate molding forming step for forming an object;
a removing step of removing the part to be removed from the intermediate molded product to form the discharge hole;
and a slit forming step of forming the slit. In the intermediate molded product forming step, the intermediate molded product is formed by injection molding the connecting body using the elastic membrane as an insert,
9. The method of manufacturing a cap according to claim 8, wherein the gate mark of the connecting body is formed in the portion to be removed.

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