JP2012121624A - Hinge cap with separation disposal function, and method for manufacturing thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hinge cap having excellent heat resistance and sealing property capable of corresponding to a thermal filling (hot filling), and which can be taken out from the mouth part of a container easily at the time of completion of the use of content.SOLUTION: The hinge cap includes an upper lid 20 hinge-coupled to a cap body 1, wherein a cylindrical side wall is doubly formed which covers a skirt part from the outside in the skirt part 3 of the cap body 1, a first cylindrical side wall 11a positioned inside of the cylindrical side wall is continued in a lower end or upper end of the skirt part 3 in the lower end or upper end of the cylindrical side wall, a second cylindrical side wall 11b positioned outside of the cylindrical side wall is continued in a lower end or upper end of the first cylindrical side wall 11a in the lower end or upper end of the same, the upper lid 20 is hinge-coupled to the upper end of the second cylindrical side wall 11b, and an unbreakable connecting part 12a is formed in the lower end or upper end of the skirt part and a joint part 12 of the lower end or upper end of the first cylindrical side wall in a position excluding a hinge formation position.

Description

  The present invention relates to a hinge cap having a separation and disposal function that can be easily removed from a container mouth, and a manufacturing method thereof. More specifically, the present invention has heat resistance and sealability that can be applied to hot filling, and moldability. The present invention also relates to a hinge cap excellent in productivity and a method for manufacturing the same.

In recent years, there has been a demand for separate disposal of waste from the viewpoint of waste disposal and resource conservation. In particular, the plastic cap attached to the container mouth is also removed from the container mouth, and the container and cap are separated and discarded. Is required.
The hinge cap used for seasonings, etc. consists of a cap main body fitted and fixed to the container mouth and an upper lid hinged to the cap main body so that it can be opened and closed, so that the cap is removed from the used container. However, since it is necessary to destroy the cap body and the removal operation is extremely troublesome, there is a problem that the separation and disposal is still insufficient.

In order to solve such problems, various proposals have been made. For example, in a hinge cap consisting of a cap body consisting of a top plate and a cylindrical side wall and an upper lid hinged to the cylindrical side wall, the cylindrical side wall is divided into an inner side wall and an outer side wall by a slit extending downward from the upper end. A hinge cap in which axial scores are formed on the inner and outer walls corresponding to the hinge connection is described (Patent Document 1). In this hinge cap, the score of the outer wall can be broken by pulling the upper lid diagonally downward, and then the inner wall can be broken upward from the lower end by pulling the upper lid diagonally upward. By pulling it up, the cap body can be easily removed from the container mouth.
In addition, the cap body having an axial cutout in the skirt portion, and the cap body skirt portion and the cutting surface are separated from each other by a plurality of breakable bridging portions above or below the cutting surface. There is described a cap that is formed of an outer cylinder that is integrally formed via a pin and that has a score provided on one of the hinge connecting portions of the outer cylinder (Patent Document 2). In this hinge cap, by pulling the upper lid diagonally downward to break the score of the outer cylinder, the bridge body between the outer cylinder and the cap main body skirt portion is broken, thereby the cap body provided with a notch The skirt portion can expand in the radial direction, and the cap body can be easily removed from the container mouth portion. Furthermore, the cap in which the cylindrical side wall as described in Patent Documents 1 and 2 is a double wall by a circumferential slit has not only excellent separation and disposal but also the skirt portion is hooked by the outer cylinder. Since it has a structure, the container mouth is tightly fitted between the skirt and the inner ring, and the sealing performance is also good.

Japanese Patent No. 4580064 Japanese Patent No. 4095129

The hinge cap having a double wall as described above is excellent in hermeticity, so it can also be used for hot filling where it is decompressed by being subjected to a filling process and a cooling process of high-temperature contents. However, in Patent Document 1, since the double wall is formed at the time of injection molding, there is a problem that the tool entering between the inner wall and the outer wall constituting the double wall is easily damaged by the resin pressure. In addition to being inferior in productivity, it was not fully satisfactory in terms of productivity. In particular, in order not to weaken the holding force of the cap after the plugging, it is desirable to narrow the distance between the inner wall and the outer wall, but the tool is more likely to be damaged by the narrowing.
Further, in Patent Document 2, it is desirable to form a gap between the cap main body skirt portion and the cylindrical side wall as small as possible in order not to weaken the holding power of the cap during hot filling. In order to do this, the cap body skirt part and the outer cylinder were formed by cutting by post-processing.
However, such post-processing has a problem that it is difficult to set the tool, and the tool is easily damaged by the resin pressure applied at the time of molding, which is inferior in moldability and not satisfactory in terms of productivity.

Accordingly, the object of the present invention is to have excellent heat resistance and sealability that can also be applied to hot filling (hot filling), and can be easily removed from the container mouth when use of the contents is finished. It is to provide a hinge cap having separability.
Another object of the present invention is to provide a production method capable of producing a hinge cap having the above characteristics with good moldability and productivity.

According to the present invention, the cap main body is composed of a top plate portion and a skirt portion, the top plate portion is formed with a planned opening portion, and the inner surface of the skirt portion is provided with a protrusion that engages with the container mouth portion, and the cap main body. In the hinge cap comprising an upper lid hinged to the skirt, the skirt portion of the cap body is formed with a double cylindrical side wall that covers the skirt portion from the outside, and is located inside the cylindrical side wall. The first cylindrical side wall is continuous with the lower end or upper end of the skirt portion at the lower end or upper end, and the second cylindrical side wall located outside of the cylindrical side wall is the first cylinder at the upper end or lower end. The upper end of the skirt portion is continuous with the upper end or the lower end of the side wall, and the upper lid is hingedly connected to the upper end of the second cylindrical side wall. Side Hinge cap, wherein the connecting section can not break the connection portion of the bottom or top is formed is provided.
In the hinge cap of the present invention,
1. At least one longitudinal notch is formed in the first cylindrical side wall;
2. A weakened portion that can be broken is formed in a range of 190 to 310 ° around the hinge forming position at the connecting portion between the lower end of the skirt portion and the lower end of the first cylindrical side wall on the side corresponding to the hinge forming position.
Is preferred.

According to the present invention, a cap main body comprising a top plate portion and a skirt portion, a planned opening portion is formed on the top plate portion, and a protrusion engaging with the container mouth portion is provided on the inner surface of the skirt portion, and the cap The upper lid is hinged to the main body, and a first cylindrical side wall is formed at the lower end or upper end of the skirt portion of the cap main body, and a second cylindrical side wall is formed at the lower end or upper end of the first cylindrical side wall. The upper lid is hinged to the upper end of the second cylindrical side wall, and the lower end or upper end of the skirt portion and the upper end or lower end of the first cylindrical side wall at a position excluding the hinge forming position After integrally forming the intermediate body in which the non-breakable connecting portion is formed, the first cylindrical side wall is located outside the skirt portion, and the second cylindrical side wall is the first cylindrical shape. The first cylindrical side so that it is located outside the side wall Method of forming a hinge cap, characterized in that reversing is provided a.
In the hinge cap molding method of the present invention,
1. The first cylindrical side wall has a taper whose outer diameter decreases as it goes to the connecting portion with the skirt portion;
2. After removing the intermediate from the mold or in the mold, inverting the first cylindrical side wall;
Is preferred.

In the hinge cap of the present invention, the cylindrical side wall covering the cap main body skirt part from the outside is formed without performing post-processing which has been a cause of damage to tools such as a cutter, and has excellent formability. Yes.
Moreover, in the hinge cap of this invention, since the cylindrical side wall is doubled, a cap main body skirt part can be firmly fastened from the outside, and it is excellent in the sealing performance of a cap. For this reason, since the inside of a cap will be in a pressure-reduced state in order to cool after filling with a high temperature content, it can respond | correspond suitably to hot filling which requires high sealing performance.
Furthermore, since the cap can be easily removed from the inside of the container by pulling the upper lid upward, the waste disposal is excellent.

  In the hinge yap manufacturing method of the present invention, the cylindrical side wall portion that has been conventionally formed by post-processing is integrally formed without post-processing, and a necessary jig or the like is used in the molding machine or after molding. By inverting the first cylindrical side wall, it is possible to assemble the first and second cylindrical side walls into a finished shape positioned on the outer surface of the skirt part, and change according to the application, jig to be used, etc. It is possible.

It is side sectional drawing of the state which opened the upper cover in the completed shape of an example of the hinge cap of this invention. It is a top view in the state where the upper cover of the hinge cap shown in FIG. 1 was opened. It is a sectional side view which shows the state in which the hinge cap shown in FIG. 1 was applied to the container opening part, and the opening was formed. It is a sectional side view for demonstrating the removal from the container opening part of the hinge cap shown in FIG. It is a sectional side view for demonstrating the removal from the container opening part of the hinge cap shown in FIG. It is a sectional side view of the state before setting the cylindrical side wall of the hinge cap shown in FIG. It is a sectional side view explaining the other aspect of the hinge cap shown in FIG. It is a sectional side view of the state which opened the upper cover in the completed shape of another example of the hinge cap of this invention. It is a sectional side view which shows the state by which the hinge cap shown in FIG. 8 was applied to the container opening part, and the opening was formed. It is a sectional side view of the state before setting the cylindrical side wall of the hinge cap shown in FIG. It is a sectional side view explaining the other aspect of the hinge cap shown in FIG. It is a sectional side view for demonstrating the removal from the container opening part of the hinge cap shown in FIG. It is a sectional side view for demonstrating the removal from the container opening part of the hinge cap shown in FIG. It is a sectional side view for demonstrating shaping | molding of the hinge cap before the cylindrical side wall setting shown in FIG. It is a sectional side view for demonstrating shaping | molding of the hinge cap before the cylindrical side wall setting shown in FIG. It is a sectional side view for demonstrating shaping | molding of the hinge cap before the cylindrical side wall setting shown in FIG. It is a sectional side view for demonstrating shaping | molding of the hinge cap before the cylindrical side wall setting shown in FIG. It is a sectional side view for demonstrating shaping | molding of the hinge cap before the cylindrical side wall setting shown in FIG. It is a sectional side view for demonstrating shaping | molding of the hinge cap before the cylindrical side wall setting shown in FIG.

(Hinge cap)
A hinge cap according to the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a side sectional view showing an example of a hinge cap in a completed state of the present invention, FIG. 2 is a top view of the hinge cap shown in FIG. 1, and FIG. It is a sectional side view which shows the state which applied to the opening part and formed opening.
The hinge cap shown in FIGS. 1 to 3 generally includes a cap body 1 fitted and fixed to the container mouth 30 and an upper lid 20 hinged to the cap body 1.
The cap body 1 includes a top plate portion 2 and a skirt portion 3 depending from the outer periphery of the top plate portion 2. In the center of the top plate portion 2, a planned opening portion 5 that is partitioned by a score 4 is formed, and a grip portion 6 for tearing the score and forming the opening 16 (FIG. 3) is provided in the planned opening portion via a support. Is formed. In the top view shown in FIG. 2, the gripping portion 6 is removed in order to clearly show the planned opening portion 5.
Further, a dispensing nozzle 7 is formed so as to surround the planned opening portion 5. The dispensing nozzle 7 is formed with a portion 7b having a lower height than the portion 7a on the dispensing direction side so as not to obstruct the opening and closing of the upper lid 20 on the opposite side (hinge connection side) of the dispensing direction. ing.
On the other hand, on the inner surface side of the top plate portion 2, an inner ring that is in close contact with the inner side surface 31 of the container mouth portion 30 and firmly fixes the cap together with the skirt portion 3 to the container mouth portion to ensure liquid tightness before opening formation. 8 is formed. An engaging portion 9 for fitting and fixing an upper lid 20 described later is formed on the outer peripheral edge of the top plate portion 2.

An engagement protrusion 10 is formed at the lower end of the inner surface of the skirt portion 3 to engage with an engagement protrusion 32 formed on the outer surface of the container mouth portion 30 and to fix the cap to the container mouth portion 30 together with the inner ring 8. Yes. Further, on the outer surface of the skirt part, the cylindrical side wall 11 composed of the first cylindrical side wall 11a and the second cylindrical side wall 11b located on the skirt part 3 side is positioned so as to tag the skirt part 3 from the outside. is doing. In the embodiment shown in FIG. 1, the cylindrical side wall 11 is connected to the lower end of the skirt portion 3 and the lower end of the first cylindrical side wall 11a, and the upper end of the first cylindrical side wall 11a is connected to the second cylindrical side wall. The upper end of 11b is connected.
In addition, the connection part 12 of the lower end of the skirt part 3 and the lower end of the 1st cylindrical side wall 11a can be fracture | ruptured in the range of 190-310 degrees, especially 240-300 degrees centering on the hinge formation position in the hinge part side. Since the weakened portion 12a is formed, and the connecting portion 13 between the upper end of the first cylindrical side wall 11a and the upper end of the second cylindrical side wall 11b is formed so as not to be broken, the cap from the container mouth portion is formed. The weakened portion 12a is broken at the time of removal, and can be easily removed as will be described later.
A concave portion 14 is formed in the upper portion of the outer surface of the second cylindrical side wall 11b in the content pouring direction so as to make it easier to apply a handle to an upper lid to be described later.

An upper lid 20 is connected to the upper end of the second cylindrical side wall 11b in the direction opposite to the content pouring direction via a hinge portion 15.
The upper lid 20 is composed of a top surface 21 and an annular side wall 22, and is fitted on the inner surface of the top surface 21 with the dispensing nozzle 7 formed on the cap body 1 to ensure liquid tightness after the opening is formed. An arcuate protrusion 24 is formed at a location corresponding to the annular protrusion 23 and the lower portion 7 b of the above-described dispensing nozzle 7. An engagement protrusion 25 for engaging with the engaging portion 9 of the cap body is formed on the inner surface of the lower end of the annular side wall 22, and a knob 26 for opening and closing the upper lid is formed on the opposite side to the hinge of the annular side wall 22. Has been.

The hinge cap of the present invention shown in FIGS. 1 to 3 is removed from the container mouth as shown in FIGS.
That is, when the upper lid 20 is pulled upward, the connecting portion 13 between the upper end of the first cylindrical side wall 11a and the upper end of the second cylindrical side wall 11b is formed so as not to be broken. The weakened part 12a formed on the hinge part side of the connecting part 12 at the lower end of the first cylindrical side wall 11a is broken, and the cylindrical side wall 11 on the hinge part side is removed from the skirt part 3, whereby the cap body skirt The external force that has tightened the part is released (see FIG. 4).
Next, when the upper lid 20 is lifted obliquely upward to the right in the figure, the portion on the opposite side of the hinge portion 15 of the connecting portion 12 between the lower end of the skirt portion 3 and the lower end of the first cylindrical side wall 11a is formed so as not to be broken. Therefore, the cap main body 1 is removed from the container mouth portion 30 together with the cylindrical side wall 11 from the portion on the opposite side of the hinge portion 15 (see FIG. 5), and the upper lid 20 is further pulled in the right direction in the drawing to It can be completely removed from the mouth.

FIG. 6 is a view for explaining a state (intermediate body) in which the cylindrical side wall is not set outside the skirt portion in the hinge cap shown in FIGS. 1 to 3 described above.
As shown in FIG. 6, the hinge cap shown in FIGS. 1 to 3 has a lower end of the skirt portion 3, an upper end of the first cylindrical side wall 11a (in a state during molding), and a lower end of the first cylindrical side wall 11a. (In the state at the time of molding) and an intermediate body in which the upper ends of the second cylindrical side walls 11b are continuously formed.
The first cylindrical side wall 11a has a tapered shape in which the vicinity of the upper end (in the state at the time of molding) has an inner diameter that is substantially the same as the outer diameter of the lower end of the skirt portion, and the diameter slightly increases toward the bottom. It has become. Similarly, the second cylindrical side wall 11b has a taper whose upper end has an inner diameter that is substantially the same as the outer diameter of the first cylindrical side wall 11b, and whose diameter slightly increases toward the bottom. It is in the shape. As a result, when the hinge cap is set to the completed shape, the first cylindrical side wall can be easily reversed, and the cylindrical side wall can be smoothly positioned outside the skirt, and the hinge cap is attached to the container. In this state, the skirt portion spreads outward, and the cylindrical side wall can be brought into close contact with the outer surface of the skirt portion to exert an effect of tightening.

As described above, the connecting portion 12 between the lower end of the skirt portion 3 and the upper end of the first cylindrical side wall 11a (in the state at the time of molding) is a connecting portion that becomes a weakened portion that can be broken at a position corresponding to the hinge forming position. 12a is formed, and portions other than the connecting portion 12a are formed as non-breakable connecting portions.
Furthermore, since the first cylindrical side wall 11a is inverted and positioned on the outer side of the skirt portion, it is necessary to have flexibility, so that the first cylindrical side wall 11a is formed thin. Therefore, as shown in FIG. 7, a plurality of cutouts 17, 17 or thin portions extending in the vertical direction can be formed on the inner surface (outer surface in the finished shape) of the first cylindrical side wall 11a.

8 and 9 are views for explaining another aspect of the hinge cap of the present invention. In this aspect, the weakened part that can be broken by the skirt part and the connecting part 12 of the first cylindrical side wall 11a. 12a is not formed, the upper end of the first cylindrical side wall 11a is connected to the upper end of the cap body skirt portion 3, and the lower end of the first cylindrical side wall 11a and the lower end of the second cylindrical side wall 11b are The basic structure is the same as the hinge cap shown in FIGS. 1 to 7 except that a weakened portion 13a that can be broken is formed in the connecting portion 13 of the first cylindrical side wall 11a and the second cylindrical side wall 11b. The configuration is almost the same.
That is, as apparent from FIGS. 10 and 11 for explaining a state (intermediate body) in which the cylindrical side wall of the hinge cap shown in FIGS. The side wall 11a and the second cylindrical side wall 11b are molded in a state extending upward from the upper end of the skirt portion. The first cylindrical side wall 11a has a tapered shape in which the vicinity of the lower end (in the state of molding) has an inner diameter that is substantially the same as the outer diameter of the upper end of the skirt portion, and the diameter slightly increases toward the upper side. It has become. Similarly, the second cylindrical side wall 11b has a taper whose bottom end has an inner diameter that is substantially the same as the outer diameter of the first cylindrical side wall 11a, and whose diameter increases slightly upward. It is in the shape.
Further, as described with reference to FIG. 7, also in this embodiment, as shown in FIG. 11, the inner surface (outer surface in the finished shape) of the first cylindrical side wall 11 a has a plurality of cutouts 17 or thin portions extending in the vertical direction. By forming, inversion of the 1st cylindrical side wall 11a can be made easy.

12 and 13 are views for explaining the removal of the hinge cap of this aspect from the container mouth, and when the upper lid 20 is pulled upward, the first cylindrical side wall 11a is inverted, and the first The cylindrical side wall 11a and the second cylindrical side wall 11b have a shape extending upward from the upper end of the skirt portion, and the skirt portion is released from the external force that has been tightened by the cylindrical side wall, and the first cylindrical side wall is released. The weakened part 13a formed in the hinge side of the connection part 13 of 11a and the 2nd cylindrical side wall 11b is fractured | ruptured (refer FIG. 12).
When the hinge cap is further lifted upward, the connection between the upper end of the first cylindrical side wall portion 11a and the upper end of the skirt portion 3, the lower end of the second cylindrical side wall 11b, and the lower end of the first cylindrical side wall 11a. Since the portion on the opposite side of the hinge portion 15 of the portion 13 is formed so as not to be broken, the cap body 1 is removed from the container mouth portion 30 together with the cylindrical side wall 11 from the portion on the opposite side of the hinge portion 15 ( (See FIG. 13).

  In this embodiment, in the specific example shown in the figure, the weakened portion 13a is formed in the connecting portion 13 between the lower end of the first cylindrical side wall 11a and the lower end of the second cylindrical side wall 11b. The weakened part 12a can also be formed in the connection part 12 of 11a upper end and a skirt part upper end.

(Manufacturing method of hinge cap)
14 to 19 are views for explaining a hinge cap forming process in a state before setting the cylindrical side wall shown in FIG.
As shown in FIG. 14, the hinge cap of the present invention includes a die 41 defining the outer surface of the top plate portion, the outer surface of the skirt portion and the outer surface of the first cylindrical side wall, and the inner surface of the upper lid, the second outer surface of the cylindrical side wall and the upper lid. A mold 42 that defines the outer surface, a cap body top plate section defined by the inner ring and a mold 43 that defines the inner surface of the inner ring, a mold 44 that defines the inner surface of the inner ring and the inner surface of the skirt, a mold 45 that defines the inner surface of the cylindrical side wall, The molten resin can be integrally molded by injecting it into a space restricted by a mold 46 (ring-shaped pusher) that defines the lower surface of the second cylindrical side wall.
After injecting the molten resin, the mold 41 is first removed (FIG. 15), then the mold 42 is removed (FIG. 16), and the mold 43 is further removed (FIG. 17). Next, the lower end of the second cylindrical side wall 11b is pushed upward by the ring-shaped pusher 46 that is provided outside the mold 45 and is positioned at the lower end of the second cylindrical side wall 11b (FIG. 18). As a result, the first cylindrical side wall 11a is inverted and positioned outside the skirt portion 3, and the second cylindrical side wall 11b is positioned outside the first cylindrical side wall 11b, as shown in FIG. The hinge cap of the present invention is molded (FIG. 19).
14 to 19, it is assumed that the cylindrical side wall is not set up to the finished shape in the same molding process and applied to the container mouth in the finished shape. In the present invention, the present invention is not limited to this, and a shape in which the cylindrical side wall is not set, that is, a state described in FIGS. You can also Thereafter, the upper lid is put on the cap body to complete the hinge cap.

In the hinge cap of this invention, it is not limited to the specific example mentioned above, A various change is possible.
For example, the weakened portion formed in the connecting portion can take a conventionally known configuration as long as it can be broken, and of course, it can be a combination of a brittle portion and a slit that can be broken, or a weakened portion. Depending on the size (angle) of, it may already be broken over the entire range.
Further, the notch formed in the first cylindrical side wall can take various forms as long as it improves the flexibility of the first cylindrical side wall and facilitates the inversion thereof. As shown in FIG. 11, it may be completely formed as a hole, or it may only have a vertical line break.
Further, the planned opening portion may be not only a portion defined by the score but also a portion that covers the already formed opening with a hermetic seal. Further, the mechanism for breaking the planned opening portion is not limited to the one that pulls the gripping portion 6 and breaks the planned opening portion, but can take various other forms.
Since the hinge cap of the present invention has heat resistance that can withstand hot filling, it is preferably molded from a thermoplastic resin excellent in heat resistance, such as polypropylene, low density polyethylene, linear low density polyethylene, etc. Can be preferably used.

  The hinge cap of the present invention is excellent in separation and disposal and has heat resistance and sealability that can withstand hot filling, so it can be suitably used particularly for containers such as seasonings and oils. Besides this, it can be suitably used for foods such as beverages.

  DESCRIPTION OF SYMBOLS 1 Cap main body, 2 Top plate part, 3 Skirt part, 4 Score, 5 Opening planned part, 6 Grasp part, 7 Nozzle for extraction, 8 Inner ring, 11a 1st cylindrical side wall, 11b 2nd cylindrical side wall, 12 connection part, 12a weakening part, 13 connection part, 13a weakening part, 15 hinge part, 17 notch, 20 upper lid, 30 container mouth part.

Claims (6)

A cap body comprising a top plate portion and a skirt portion, a planned opening portion is formed in the top plate portion, and a protrusion engaging with the container mouth portion is provided on the inner surface of the skirt portion, and an upper lid hinged to the cap body In the hinge cap consisting of
The skirt part of the cap body is formed with a double cylindrical side wall covering the skirt part from the outside, and the first cylindrical side wall located on the inner side of the cylindrical side wall has a lower end or an upper end. The second cylindrical side wall located outside the cylindrical side wall is continuous with the upper end or the lower end of the first cylindrical side wall at the upper end or the lower end thereof, The upper lid is hinged at the upper end of the second cylindrical side wall, and cannot be broken at the lower end or upper end of the skirt portion and the lower end of the first cylindrical side wall or the connecting portion at the upper end of the first cylindrical side wall. A hinge cap characterized in that a connecting portion is formed.   The hinge cap according to claim 1, wherein at least one longitudinal notch is formed in the first cylindrical side wall.   The weakening part which can be fractured is formed in the range of 190-310 degrees centering on a hinge formation position in the connection part of the skirt part lower end and the 1st cylindrical side wall lower end in the side corresponding to the hinge formation position. The hinge cap according to 1 or 2.   A cap body comprising a top plate portion and a skirt portion, a planned opening portion is formed in the top plate portion, and a protrusion engaging with the container mouth portion is provided on the inner surface of the skirt portion, and an upper lid hinged to the cap body A first cylindrical side wall is formed at the lower end or upper end of the skirt portion of the cap body, and a second cylindrical side wall is formed at the lower end or upper end of the first cylindrical side wall, and the upper lid is A connecting portion that is hinged to the upper end of the second cylindrical side wall and cannot be broken at the lower end or upper end of the skirt portion and the upper end or lower end of the first cylindrical side wall at a position excluding the hinge forming position. After the intermediate body formed with is integrally formed, the first cylindrical side wall is positioned outside the skirt portion, and the second cylindrical side wall is positioned outside the first cylindrical side wall. To invert the first cylindrical side wall Method of forming a hinge cap according to symptoms.   5. The method of forming a hinge cap according to claim 4, wherein the first cylindrical side wall has a taper that decreases in outer diameter as it goes to the connecting portion with the skirt portion.   The molding method according to claim 4 or 5, wherein the first cylindrical side wall is reversed after the intermediate body is taken out of the mold or in the mold.

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