JP3105671B2 - Cap with pull ring and method of manufacturing the cap - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cap with a pull ring made of synthetic resin and a method for producing the same.

[0002]

2. Description of the Related Art An inner / outer double cylinder for fitting a container mouth and neck is hung down from an outer peripheral portion of a top wall, and a spout cylinder is formed from an upper top wall portion of an inner cylinder of the double cylinder and surrounds the spout cylinder. The short cylinder for cap fitting is erected, respectively, and a thin break line is provided around the top wall portion surrounded by the inner cylinder and the pouring cylinder, and the top wall portion surrounded by the break line is a removal plate portion, There is known a synthetic resin cap with a so-called pull ring in which a connecting piece is erected from a part of a peripheral edge of the removing plate portion and a pull ring is attached to an upper end of the connecting piece.

[0003] In the cap, when the pull ring is pulled upward, the break line is cut and a top wall portion surrounded by the break line is removed, so that a center portion of the top wall is opened. There is a drawback that the flavor of the sauce is dissipated from the thin break line portion when fitted into the sauce storage bottle. In order to remove this defect, a method was considered in which a sheet in which a plastic film was layered above and below a metal thin plate was attached to the lower surface of the top wall portion having the break line, but the sheet was exposed at the outer peripheral end face. Therefore, there is a risk of corrosion or the like when the liquid in the container touches the end face.
In order to eliminate the drawback, Japanese Utility Model Publication No. 4-39174 proposes that the outer peripheral portion of the metal sheet is embedded in the upper portion of the inner cylinder by insert molding so as to be attached to the lower surface of the top wall.

[0004]

In the above-mentioned cap for insert-molding a sheet containing a metal plate, the sheet is placed on a mold portion for forming a top wall so that an outer peripheral portion of the sheet is formed into a cavity for forming an inner cylinder. The molten resin material injected from the runner provided in the top wall upper surface forming mold into the top wall forming cavity flows into the entire cavity, and is provided so as to bury the outer peripheral portion of the sheet. I have.

However, the injection pressure of the molten resin material is extremely high, so that the outer peripheral portion of the sheet protruding into the cavity is bent downward by the inflowing resin material and the upper outer peripheral portion of the mold portion on which the sheet is placed. The outer peripheral portion of the sheet is exposed to the outside, which sometimes makes it impossible to embed the outer peripheral portion in the inner cylinder. In order to remove the defect, it is conceivable to make the metal sheet thick so as to prevent the outer peripheral portion of the sheet from being bent as described above. It is extremely difficult to remove the sheet portion by breaking.

The present invention eliminates the above-mentioned drawbacks by integrally layering the above-mentioned sheet on the upper surface of the top wall of the cap by insert molding, and enables a cap with a pull ring having no such drawbacks to be formed easily and quickly. Things.

[0007]

Means for Solving the Problems A central portion of the top wall portion surrounded by the pouring cylinder is surrounded by a break line to form a removing plate portion, and the upper portion of the connecting piece that rises upward from a side portion of the removing plate portion. A pull ring was attached, and a non-breathable laminate sheet was integrally layered on the upper surface of the top wall portion surrounded by the pouring cylinder and the lower outer surface of the connecting piece by insert molding.

A laminating sheet is attached to the lower surface of the upper surface forming die portion of the top wall portion surrounded by the pouring cylinder, and can be moved up and down into one of the upper and lower dies of the connecting piece forming cavity portion. The laminated sheet is opened by the pin mold, and the molten resin material flowing into the cavity portion for forming the top wall is connected to the connecting piece through the through hole opened by the pin mold. And it is made to flow into each cavity part for pull ring formation, and the cap of Claim 1 is integrally molded.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a cap with a pull ring according to a first embodiment shown in FIGS. 1 to 3 will be described. 1 is a cap body, and an outer peripheral wall 3 fitted from the outer periphery of the top wall 2 to the outer surface of the mouth and neck of the container body. Further, an inner peripheral wall 4 to be fitted to the inner surface of the mouth and neck portion is vertically provided from the inner top wall portion. Also, a spout cylinder 5 is erected from the top wall portion above the inner peripheral wall, the upper end thereof is bent upward and outward, and a cap fitting short is formed from an intermediate portion between the spout cylinder and the outer periphery of the top wall. The cylinder 6 is standing upright. By forming a V-shaped concave groove 7 on the lower surface of the top wall portion surrounded by the inner cylinder 4 and the pouring cylinder 5, the grooved portion is formed as a thin break line 8, and the top wall surrounded by the break line is formed. The portion is a removal plate portion 9. The shape of the removing plate portion may be arbitrarily determined, as shown in FIG. The connecting piece 10 is erected from a part of the peripheral edge of the removing plate 9 and a pull ring 11 is attached to the upper end of the erected piece in a horizontal state. The connecting piece has a tubular shape with an opening at the upper end, and as shown in FIGS. 2 and 3, has through holes 12, 12 at the side edges of the removing plate portion on both left and right sides of the connecting piece.

A lid 13 is attached to the cap body. The lid body has a lid peripheral wall 15 lowering from the outer periphery of the lid top wall 14 and a sealing cylinder hanging down from the top wall to the outer surface of the short cylinder 6 described above.
16 can be fitted into the inner surface of the upper end of the pouring cylinder 5, and the lower end of the rear portion of the lid peripheral wall arbitrarily determined is connected to the upper end of the rear portion of the cap main body outer peripheral wall 3 via the hinge 17. The hinge may be provided as a so-called three-point hinge so that the lid body can be elastically inverted.

A non-breathable laminate sheet 21 is integrally laminated on the upper surface of the top wall portion and the outer surface of the connecting piece surrounded by the pouring cylinder 5 by insert molding. The laminated sheet is preferably formed by laminating a water-resistant plastic film on both upper and lower surfaces of an aluminum thin plate, but may be another metal thin plate in place of the aluminum thin plate, or may be a sheet having a plurality of plastic films layered. Good. The sheet is cut along the breaking line 8 by pulling up the pull ring 11. The insert molding of the laminate sheet 21 will be described later.

The cap of the second embodiment shown in FIGS. 4 to 6 is different from that of the first embodiment in that only the upper part of the connecting piece 10 is made tubular, and a through hole 22 is provided in the center of the laminate sheet 21. The central portion of the top wall is raised into the through hole.

FIGS. 7 and 8 show a third embodiment of the present invention.
Is not tubular, and the front surface is inclined rearward and upward, and has a rectangular section with a thick bottom and a thin top.

In the fourth embodiment shown in FIGS. 9 and 10, the lower part of the connecting piece 10 is formed in a tube having a lower surface opening.

FIGS. 11 to 13 show the insert molding of the laminate sheet 21 in the cap of the first embodiment described above.
As shown in FIG. 11, a connecting piece 10 and a pull ring 11 are provided above a lower mold group 25 in which a cavity for forming the top wall 2, the inner peripheral wall 4, the outer peripheral wall 3, and the lid 13 is formed on the upper surface side. , Dispensing cylinder 5,
The upper mold group 26 having the short cylinder 6 and the cavity for forming the seal cylinder 16 on the lower surface side is located. A runner 27 is provided on the center axis of the lower surface forming die on the top wall of the lower die group, and a gate 28 is formed at the center of the upper surface of the die. A connecting piece forming cavity 29 is provided on the lower side of the mold that forms the inner surface of the pull ring and the upper surface of the top wall portion surrounded by the lower portion of the pull ring, and the pin mold 30 is moved up and down in the upper mold portion of the cavity. Provided as possible. The laminate sheet 21 is adsorbed to the lower surface of the upper surface forming mold of the top wall portion surrounded by the pouring cylinder by suction from the gap 31 between the molds.

The upper and lower mold groups are closed from the state of FIG. 11 as shown in FIG. 12, and the pin mold 30 is lowered from the state as shown in FIG. If a portion of the sheet is opened and the molten wood material is injected from the runner 27 in this state, the material that has entered the cavity for forming the top wall presses between the edge of the opening and the pin mold. By expanding, the laminate sheet portion located between the connecting piece forming cavity and the lower top wall portion forming cavity is pressed against the inner wall surface of the connecting piece forming cavity, so that the connecting piece and the pull ring forming cavity are pressed. And V-shaped groove forming mold part 32 and laminate sheet
21 and into the cavity for forming the external part of the cap body and further through the mold portion 33 for forming the hinge into the cavity for forming the lid, thus forming the cap. The sheet portion pressed against the inner wall surface of the connecting piece forming cavity becomes a laminated sheet portion 21a to be layered on the lower outer surface of the connecting piece at the time of forming the cap. When the laminated sheet is opened by the pin mold 30, the protrusions 33 are raised from the upper surface of the top wall forming mold so that the laminated sheet does not move and the opening is not incomplete. The sheet is sandwiched between the upper surface of the part and the mold part where the upper surface of the laminate sheet is in contact. The through-holes 12, 12 in FIG. 3 are extraction holes for the projections 33, 33.

As shown in FIGS. 4 to 6, the cap of the second embodiment differs from the cap of FIG. 11 to FIG.
26, a through hole 22 is provided at the center of the laminate sheet 21, a gate 28 is located at the center of the through hole, and molding is performed. In the case of forming the cap of this embodiment, after the laminated sheet is opened, the pin mold 30 is pulled back to the position shown in FIG. 12 and injection-molded.

FIGS. 14 and 15 show an example in which the pin mold 30 is provided on the lower mold group 25 side.

In the case of the cap of the third embodiment shown in FIGS. 7 and 8, the upper end surface of the pin mold 30 is kept horizontal like the upper surface of the lower surface forming mold of the top wall as shown in FIG. After the sheet is opened by raising the pin mold, the sheet is lowered to the original position and injection-molded. In the case of the fourth embodiment cap shown in FIGS. 9 and 10, the upper end of the pin mold is closed. It is injection-molded at the position where the sheet is opened as a spear.

[0020]

According to the present invention, the non-breathable laminate sheet 21 is layered on the upper surface of the top wall portion surrounded by the pouring cylinder. There is no danger that the liquid in the container will come in contact with it and cause a part of the liquid to corrode, and the fragrance etc. of the liquid in the container will not be lost through the breaking line 8 provided around the top wall. Since the laminate sheet 21 is also layered on the lower outer surface of the connecting piece 10 rising from the side of the surrounding removing plate portion 9, the breaking line 8 is located at the lower end of the rear surface of the connecting piece 10, so that from the breaking line portion Even if the fragrance loss cannot be prevented only by the laminate sheet layered on the top wall upper surface, the laminated portion layered on the lower outer surface of the connecting piece is prevented, and the fragrance loss and the like are surely prevented. it can.

In the case of the second aspect, the laminate sheet 21 is adhered to the lower surface of the upper surface forming die portion of the top wall portion surrounded by the pouring cylinder, and any one of the upper and lower dies of the connecting piece forming cavity portion. Pin mold that can move up and down into one side mold
Then, the laminated sheet is opened by the pin mold, and the molten resin material flowing into the cavity for forming the top wall is formed with the connecting piece and the pull ring through the through hole opened by the pin mold. Since the cap according to the first aspect is integrally formed by flowing into each cavity portion for use, the molding can be performed easily and reliably.

[Brief description of the drawings]

FIG. 1 is a sectional view of a cap according to a first embodiment of the present invention.

FIG. 2 is a plan view of the cap of FIG. 1;

FIG. 3 is an enlarged view of a main part in section taken along the line III-III of FIG. 1;

FIG. 4 is a sectional view of a cap according to a second embodiment.

FIG. 5 is a plan view of the cap shown in FIG. 4;

FIG. 6 is an enlarged view of a main part in section taken along the line VI-VI of FIG. 4;

FIG. 7 is a sectional view of a cap according to a third embodiment.

8 is a plan view of the cap of FIG. 7;

FIG. 9 is a sectional view of a cap according to a fourth embodiment.

FIG. 10 is a plan view of the cap of FIG. 9;

FIG. 11 is a cross-sectional view showing a state in which the mold for cap forming of the first embodiment is opened and a laminate sheet is attached.

FIG. 12 is a cross-sectional view showing a state in which the mold of FIG. 11 is closed.

13 is a cross-sectional view showing a state in which a pin die is lowered from the state of FIG. 12 to open a laminate sheet.

FIG. 14 is a cross-sectional view showing a state where a mold for forming a cap according to a third embodiment is opened and a laminate sheet is mounted.

FIG. 15 is a cross-sectional view showing a state in which the mold of FIG. 14 is closed, the pin mold is raised, and the laminate sheet is opened.

[Explanation of symbols]

2: Top wall, 5: Discharge cylinder, 8: Break line, 9: Removal plate,
11 ... Pulling, 21 ... Laminated sheet

──────────────────────────────────────────────────の Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B65D 47/36 B29C 45/14 B29L 22:00

Claims (2)

(57) [Claims] 1. A central portion of a top wall portion surrounded by a pouring cylinder is formed as a removal plate portion by surrounding the center portion with a break line, and a pull ring is attached to an upper end of a connecting piece that rises upward from a side portion of the removal plate portion. A cap with a pull ring made of synthetic resin, wherein an impermeable laminate sheet is integrally layered by insert molding on the upper surface of the top wall portion surrounded by the pouring cylinder and the lower outer surface of the connecting piece. 2. A laminating sheet is adhered to a lower surface of an upper surface forming mold portion of a top wall portion surrounded by an ejection tube, and is vertically moved into one of upper and lower molds of a connecting piece forming cavity portion. A pin mold is movably mounted to open the laminate sheet by the pin mold, and the molten resin material flowing into the cavity portion for forming the top wall passes through the through hole opened by the pin mold. A method for manufacturing a cap with a pull ring, characterized in that the cap according to claim 1 is integrally formed by flowing into the connecting piece and each cavity portion for forming a pull ring.