JP4253728B2 - Hinge cap and manufacturing method thereof - Google Patents

Description

  The present invention relates to a hinge cap that is attached to a mouth portion of a container and a method for manufacturing the hinge cap, and more particularly to a hinge cap that is attached to a tube container or a wide-mouth container and has high production efficiency, and a method for manufacturing the hinge cap. .

  Conventionally, a cap mounted on a container is composed of a cap body having a spout that is plugged or screwed into the mouth of the container, and a lid that tightly plugs the spout connected to the cap body via a hinge. Caps to be used are widely used. The hinge cap provided with a snap mechanism at the hinge portion keeps the lid open even when the container is tilted when pouring the contents, so it is easy to use and widely used in the field of liquid seasonings. It is used.

  The hinge cap is molded in a state where the lid is opened 180 degrees with respect to the cap main body, and after the mold is released from the mold, the hinge cap is completed through a process of closing the lid. However, in the above molding process, since it is necessary to mold with the hinge cap open, a double mold projection area is required for one cap, and when a multi-piece mold is required. The mold becomes very large. Also, the cost will be large. Furthermore, it is necessary to close the lid in a later process, which increases the cost.

As a technique for solving the above-described problem, the following method has been proposed in which the process from molding to the process of closing the lid is performed with a single mold (see, for example, Patent Document 1).
A lid is integrated with a hinge at the rear upper end of the cap body, and the lid is switched between an open posture and a closed posture between the cap body and the lid, adjacent to the hinge. In a method of releasing a synthetic resin hinge cap provided with an elastic plate in the shape of a bent plate to be held: After the hinge cap is integrally molded with the lid body opened to about 180 ° with respect to the cap body, The mold device is opened to open the surface of the hinge cap on the fixed mold side, and then the elastic plate is ejected by an ejector pin protruding and retreating along the opening / closing direction of the mold device. The virtual straight line connecting both ends is raised until it is positioned in front of the hinge shaft formed by the hinge, so that the lid is released and then rotated to the closed position. Tsu to door in the release.

JP 2002-67106 A

  In the above prior art, since the process of closing the lid is performed in the same mold as one part, the cost can be reduced without requiring a separate process, but the mold structure becomes complicated, and If a defect occurs in the lid closing process, the continuous molding process may be affected. Moreover, since the hinge cap is still molded in an open state, there remains a problem that the mold becomes large.

  In view of the above circumstances, an object of the present invention is to reduce the projection area per die and to omit the closing step.

  The present invention relates to a manufacturing method of a hinge cap including a fitting cylinder attached to a mouth portion of a container and a lid body hinged to the fitting cylinder; a front cylindrical shape having a hinge part Forming a body, and forming a fitting cylinder and a lid body by cutting in the circumferential direction leaving the hinge portion at the same height position as the hinge portion of the skirt of the front cylindrical body And a cutting process.

  The front cylindrical body of the present invention is formed by injection molding or compression molding. The hinge part of this invention consists of a bending step part. The skirt according to the present invention includes a notch portion, and a hinge portion is provided in the notch portion.

In the cutting step of the present invention, the skirt is cut by a rotary blade in which the front cylindrical body has a notch portion. The hinge cap according to the present invention includes a snap hinge including a central spring hinge portion and left and right hinge portions, and a gap between the central spring hinge portion and the left and right hinge portions. wherein the notches formed in the primary molded article forming step is formed.

  The present invention is characterized in that a rib is provided on the inner surface of the skirt, and the rib is left in the cutting step to cut the skirt, thereby providing an unauthorized opening prevention function.

  A hinge cap according to the present invention is a method of manufacturing a hinge cap comprising: a fitting cylinder attached to the mouth of a container; and a lid body hinged to the fitting cylinder; A primary molded product forming step for forming the front cylindrical body, and the fitting cylinder and the lid body are cut in the circumferential direction leaving the hinge portion at the same height position as the hinge portion of the skirt of the front cylindrical body. And a hinge cap manufacturing method comprising: a cutting step for forming a hinge cap.

  Since the front cylindrical body of the present invention is molded in a so-called closed state, the mold projection area can be reduced to, for example, half of that in the conventional example. Therefore, even if the number of picks is increased, the mold does not become large.

  Since the fitting cylinder and the lid can be formed in the closed state by the cutting process of the front cylindrical body, the lid closing process as in the conventional example becomes unnecessary. Therefore, compared with the conventional example, the manufacturing work becomes easier, so that the production efficiency can be improved.

A first embodiment of the present invention will be described with reference to FIGS.
Primary molded product formation process:
The front cylindrical body portion 12 that is a primary molded product of the hinge cap is injection-molded using an injection mold 4 shown in FIG.
The injection mold 4 has a cavity 10 corresponding to the shape of the front cylindrical body 12 between a fixed mold 1 having a gate 6 at the center and the fixed mold 1 at the time of injection molding. And a core mold 2 to be made. The core mold 2 has a nested structure composed of an outer core 2a and a center core 2b.

A thermoplastic synthetic resin such as polypropylene or polyethylene is injected into the cavity 10 through the runner 8 and the gate 6 to form the front cylindrical body 12.
The front cylindrical body 12 is a primary molded product in which a skirt 15 having a hinge portion 20 and a top plate 17 that closes an upper end surface of the skirt 15 are integrated, and the gold plate is in a so-called closed state. Molded in the mold 4. After cooling the front cylindrical body 12, the ejector plate EP and the core mold 2 are opened from the parting line PL while holding the front cylindrical body 12, and then the front cylindrical body 12 is pushed out by the ejector plate EP. Release from the mold.

  The front tubular body 12 includes a tubular skirt 15 and a top plate 17 that closes the upper end surface of the skirt 15. The skirt 15 is provided with a vertical cutout portion 19, and the vertical wall of the cutout portion 19 is inclined outward and downward from the bent portion 20 to form a stepped shape, that is, a bent stepped portion. . The bent portion 20 is a so-called hinge, and a thin portion 20a is formed for easy bending.

  The skirt 15 is provided with a cut line 22 in the circumferential direction. The cut line 22 is formed in a portion of the cutout portion 19 excluding the vertical wall. The cut line 22 indicates a design cut portion scheduled to be cut by a cutting means such as the rotary blade 24, but it is not necessary to be able to discriminate by visual inspection.

  In order to make the cut line 22 easy to cut, this portion may be a thin portion. The cut line 22 is formed at the same position in the height direction as that of the hinge part 20, but the position in the height direction of the hinge part 20 is appropriately selected as necessary. On the inner surface of the lower end portion of the skirt 15, an engagement protrusion 27 that is engaged with the engagement portion of the container mouth portion 25 is provided.

  An annular seal cylinder 26 is provided on the inner surface of the top plate 17 so as to come into contact with the inner surface of the tip of the container mouth 25.

Cutting process:
Next, as shown in FIG. 3, while fixing the said front cylindrical body 12 to a rotation support apparatus (not shown), the rotary blade 24 and the cut line 22 are aligned. Then, the rotary blade 24 is driven to rotate in the arrow A24 direction, and the rotation support device is also driven to rotate the front cylindrical body 12 in the arrow A12 direction. Then, a cut is made in the cut line 22 of the front cylindrical body 12, and the fitting cylinder 28 and the lid body 30 are separated in a hinged state.

  At this time, the rotary blade 24 is provided with a blade over the entire circumference, but the vertical wall of the notch portion 19 is spaced inward from the circumferential portion of the skirt 15, leaving the hinge portion 20 and the skirt. 15 is cut and separated into the fitting cylinder 28 and the lid 30. In this way, a hinge cap that can be opened and closed simply by cutting the cut line 22 can be easily formed.

With the hinge cap closed, a stopper is attached to the mouth 25 of the tube container 31 filled with the viscous fluid. When using the contents, the side facing the hinge portion 20 of the lid 30 is pushed upward with a finger or pulled up to open the lid, and then the contents are poured out.
After the desired amount of content has been poured out, the top plate 17 of the lid 30 is pushed down with a finger and closed. At this time, since the thin portion 20a is provided in the hinge portion 20, the lid can be easily opened and closed.

A second embodiment of the present invention will be described with reference to FIG. 6. The same reference numerals as those in FIGS. 1 to 5 have the same names and functions.
The difference between this embodiment and the first embodiment is that the hinge has a snap function. That is, the hinge 35 is a snap hinge including a central spring hinge portion 36 and left and right hinge portions 37 and 38.

  Between the spring hinge portion 36 and the left and right hinge portions 37, 38, cut portions 39, 40 are formed in the primary molded product forming step. The lower ends of the cut portions 39, 40 are The hinge portions 37 and 38 extend to the lower side of the bent portion 20 a, and their upper ends extend to the vicinity of the annular seal cylinder 26 of the top plate 17. A thin groove 36a is provided at a lower end of the central hinge spring portion 36, that is, a connection portion with the skirt 15, and a thin groove 36b is provided at an upper end thereof, that is, a connection portion with the top plate.

  By providing the spring hinge portion 36, the lid can be opened and closed smoothly, and a spring force acts to maintain the open or closed state. Therefore, the lid is not inadvertently closed while the contents are poured out in the opened state.

A third embodiment of the present invention will be described with reference to FIGS. 7 and 8. The same reference numerals as those in FIGS. 1 to 6 have the same names and functions.
The difference between this embodiment and the second embodiment is that, as shown in FIG. 8, the rotary blade 24 is formed with a notch portion 24a and a bridge notch portion 41 for bridge formation. The notch 41 forms a bridge 42 while leaving a part when cutting.

  When this bridge 42 is formed, an unauthorized opening prevention function (TE function) can be provided. That is, when the lid is opened for the first time, the bridge 42 is surely cut, so that it is possible to know the unauthorized opening. The size, number, shape, position, and the like of the bridge 42 are appropriately selected as necessary. Further, the cutting edge portion 24a is positioned at the hinge portion 20 when cutting, and the skirt 15 can be cut leaving the hinge portion 20.

A fourth embodiment of the present invention will be described with reference to FIG. 9. The same reference numerals in FIGS. 1 to 6 have the same names and functions.
The difference between this embodiment and the first embodiment is as follows.
A plurality of ribs 46 are provided on the inner surface of the cut line 22 of the skirt 15 of the front cylindrical body 12, and cutting is performed using the rotary blade 24.

  The position of the rotary blade 24 is adjusted so as to cut only the thick portion of the skirt 15, so that the inner rib 46 remains without being cut. Therefore, similarly to the bridge of the third embodiment, a hinge cap having an unauthorized opening prevention function (TE) can be obtained. The size, number, shape, position, and the like of the ribs 46 are appropriately selected as necessary.

The embodiment of the present invention is not limited to the above, and may be as follows, for example.
(1) The front cylindrical body 12 is compression molded instead of injection molded. Although compression molding is difficult to mold in a complicated shape, it is suitable for mass production, so that the production efficiency can be improved.
(2) Provide a locking protrusion on the fitting tube of the hinge cap, and instead of attaching the hinge cap to the container mouth, a screw portion or a welding portion is provided on the fitting tube. Then, it is screwed or welded to the container mouth.

(3) When cutting the skirt of the front cylindrical body, only the front cylindrical body is rotated instead of rotating both the front cylindrical body and the turning blade. If it does in this way, since the position of a rotary blade is being fixed, cutting accuracy can be raised.
(4) The wall surface of the notch may be an inclined wall that is inclined with respect to the axial direction of the skirt instead of a vertical wall.

It is a front view which shows 1st Embodiment of this invention. It is the II-II sectional view taken on the line of FIG. It is a top view which shows the cutting state of the cut line of a front cylindrical body. It is a longitudinal cross-sectional view which shows the use condition of a hinge cap. It is a longitudinal cross-sectional view which shows the manufacturing state of a front cylindrical body. It is a perspective view which shows 2nd Embodiment of this invention. It is a perspective view which shows 3rd Embodiment of this invention. It is a top view which shows a rotary blade. It is a top view which shows 4th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 Injection mold 12 Front cylindrical body 15 Skirt 19 Vertical notch part 20 Hinge part 22 Cut line 24 Rotary blade 28 Fitting cylinder 30 Lid

Claims (8)

A manufacturing method of a hinge cap comprising: a fitting cylinder attached to a mouth portion of a container; and a lid body hinged to the fitting cylinder;
A primary molded product forming step of molding a front cylindrical body having a hinge portion;
A cutting step of cutting the same height position as the hinge part of the skirt of the front cylindrical body in the circumferential direction leaving the hinge part, and forming a fitting cylinder and a lid body;
A method for manufacturing a hinge cap comprising:   The method of manufacturing a hinge cap according to claim 1, wherein the front cylindrical body is formed by injection molding or compression molding.   The method for manufacturing a hinge cap according to claim 1, wherein the hinge portion is formed of a bent step portion.   4. The method of manufacturing a hinge cap according to claim 1, wherein the skirt of the front cylindrical body includes a notch, and a hinge is provided in the notch.   5. The method for manufacturing a hinge cap according to claim 1, wherein in the cutting step, the skirt is cut by a rotary blade having a notch portion in the front cylindrical body. The hinge cap includes a snap hinge including a central spring hinge portion and left and right hinge portions, and the primary molding is performed between the central spring hinge portion and the left and right hinge portions. claim 1,2,3,4, characterized in that the notches formed in the goods forming step is formed, or method of 5, wherein the hinge cap.   A rib is provided on the inner surface of the skirt, the rib is left in the cutting step to cut the skirt, and an unauthorized opening prevention function is provided. 6. A method for producing a hinge cap according to 6.   A hinge cap manufactured by the method for manufacturing a hinge cap according to claim 1, 2, 3, 4, 5, 6 or 7.

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