JPH04339774A - Synthetic resin-made cap and production thereof - Google Patents

Abstract

PURPOSE:To permit a vertical slit of synthetic resin-made cap to be accurately formed between the locking tongue pieces formed on the cap with an interrupted continuity in space between each of them. CONSTITUTION:A synthetic resin-made cap which comprises a positioning notch 7 provided in an interference bead 5 and located in a gap 15 between locking tongue pieces 4, a plurality of horizontal slits 6 formed with an interrupted continuity in space between each of them and a vertical slit 8 formed extending near the one end of a horizontal slit 6 and through the gap 15 between the locking tongue pieces 4.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin cap having a protruding locking tongue protruding from the inner surface of the cap for locking onto a bottle mouth step, and a method for manufacturing the same.

0002

2. Description of the Related Art FIG. 8 shows a conventional synthetic resin cap.

This device is disclosed in Japanese Patent Application Laid-Open No. 2-29666, and is formed by a top plate portion 1 and a cylindrical skirt portion 2 hanging from the periphery of the top plate portion 1. A plurality of bridge-forming ribs 3 are provided protruding from this lower inner surface.

Skirt portion 2 below bridge forming rib 3
Further, a locking tongue piece 4 and an interference bead 5 are provided on the lower inner surface. The locking tongues 4 are provided at intervals in the circumferential direction and are formed to protrude inward. Further, the interference bead 5 is formed below the locking tongue 4 and protrudes inward to a lesser extent than the locking tongue 4.

[0005] At the position where the bridge-forming rib 3 of the skirt portion 2 is provided, a transverse score line 6 is formed along the entire circumference in the circumferential direction. This cap is divided into an upper main body part 12 and a pilfer-proof band part (hereinafter abbreviated as PP band part) 11 by the transverse line 6.

[0006] When the cap constructed as described above is attached to the bottle mouth, the locking tongue piece 4 of the PP band portion 11 is locked to the stepped portion of the bottle mouth. When the cap is turned to open the cap, the main body part 12 rises but the PP band part 11 cannot rise, so the bridge-forming rib 3 connecting the two is cut and the cap cannot be opened. Ital. As a result, a ring-shaped PP band portion 11 remains at the bottle mouth.

[0007] The cap having the above structure has the following (1)
) to (5).

(1) A cap without the cross-stitch line 6 formed thereon is molded using a synthetic resin such as polyethylene or polypropylene.

(2) As shown in FIG. 9, a rotating spindle 13 is inserted into the cap formed as described above, and the cap is sandwiched between it and a rotatably provided pedestal 17. Then, the transverse cutter 10 is inserted into the protruding portion of the bridge forming rib 3.

(3) While rotating the cap by the rotation of the spindle 13, as shown in FIG. 10, the transverse score line 6 is formed on the cap by moving along the blade of the cutter 10 for the transverse score line.

[0011]

In such a conventional cap, a ring-shaped PP band portion 11 remains at the mouth of the bottle after the cap is opened. If the PP band portion 11 remains at the bottle mouth in this way, it may cause contamination of different materials when attempting to recycle a synthetic resin bottle such as a PET bottle. To avoid such obstacles in recycling bottles, P.
A cap that does not leave the P-band portion 11 at the mouth of the bottle and makes it clear that the bottle has been opened has been desired. In other words, a so-called one-score type pilfer-proof cap, in which the transverse score line 6 is formed with both ends separated and a vertical score line is formed at the end thereof, has been desired. According to this cap, when the cap is opened, the PP band portion 11 becomes a band-like shape and comes off from the bottle opening while being connected to the skirt portion 2.

However, when making a one-score type cap in which the locking tongues 4 are formed on the inner surface of the PP band portion 11, vertical incision lines must be formed between the locking tongues 4. However, in the conventional manufacturing method, a vertical score line was sometimes formed at the position where the locking tongue piece 4 was provided. If the position of the vertical score line overlaps with the position of the locking tongue piece 4 as described above, the locking tongue piece 4 obstructs the cutting of the vertical score line, resulting in a problem that the cap cannot be opened.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a cap that can reliably provide a vertical score line between the locking tongues 4, and a method for manufacturing the same.

[0014]

[Means for Solving the Problems] In the synthetic resin cap according to the first aspect, the above problems are solved by providing a positioning notch in the interference bead so as to be located between the locking tongues.

In the method for manufacturing a synthetic resin cap according to claim 2, a spindle having a positioning pin protruding from its circumferential surface that can pass through the positioning notch of the interference bead is inserted into the cap, and the spindle is positioned. The above-mentioned problem was solved by locking the pin between the positioning notches or the locking tongues and providing a horizontal cut line and a vertical cut line in this state.

[0016]

[Function] In the synthetic resin cap according to claim 1, since the interference bead is provided with a positioning notch located between the locking tongue pieces, the vertical cut line is The cap can be held at a predetermined angle when forming.

In the method for manufacturing a synthetic resin cap according to claim 2, a spindle having a positioning pin protruding from the circumference that can pass through the positioning notch of the interference bead is inserted into the cap, and the spindle is positioned. Since the pin is locked between the positioning notch or the locking tongue and the horizontal cut line and the vertical cut line are provided in this state, it is possible to maintain the cap at a predetermined angle when making the vertical cut line. can.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The synthetic resin cap of the present invention and its manufacturing method will be explained in detail below with reference to the drawings. Note that the same components as those of the conventional example are given the same reference numerals to simplify the explanation.

(Embodiment 1) FIG. 1 is a sectional view showing a cap of this embodiment.

A cross-cutting line 6 is formed along the circumferential direction in the protruding portion of the bridge-forming rib 3 of this cap. This transverse cut line 6 is not formed around the entire circumference of the cap, but its both ends are separated.

A positioning notch 7 is provided in the interference bead 5 so as to be located between the locking tongues 4. A vertical cut line 8 is vertically formed in a position where the gap 15 of the locking tongue piece 4 and the positioning notch 7 overlap so as to contact one end of the horizontal cut line 6.

In the synthetic resin cap of this embodiment, a positioning notch 7 is provided in the interference bead 5 so as to be located between the locking tongues 4, and the transverse insertion line 6 is formed with both ends separated. Since the vertical score line 8 was formed near one end of the horizontal score line 6 and at the position 15 between the locking tongues 4, when forming the vertical score line 8 and the horizontal score line 6, The cap body can be maintained at a predetermined angle by using the positioning notch 7 of the interference bead 5 located at the lower part of the PP band portion 11.

Therefore, in the synthetic resin cap of this embodiment, the vertical cut line 8 can be formed between the locking tongues 4 15 .

Furthermore, in this cap, as mentioned above, the vertical cut line 8 can be formed between the locking tongues 4 15, so that when the cap is opened, the PP band portion 11 becomes a band shape and is connected to the cap body 12. It is now possible to manufacture caps that can be removed from the bottle mouth while connected. This facilitates the recycling of the bottle, and further eliminates the risk of injury because the PP band 11 does not remain on the bottle mouth when the consumer drinks the contents directly from the bottle.

(Example 2) A synthetic resin cap having the structure explained in Example 1 was manufactured using the following methods (1) to (4).
) can be manufactured using the following process.

(1) A synthetic resin such as polyethylene or polypropylene is molded to form a cap in which the horizontal score lines 6 and the vertical score lines 8 are not formed.

(2) Next, the cap is sent to a score line forming device that forms horizontal score lines 6 and vertical score lines 8. As shown in FIG. 2, this score line forming device is roughly configured by a starter turret 21 that conveys the cap, a spindle 13 that rotates the cap, and a cutter 9.

As shown in FIG. 3, the spindle 13 has a cylindrical shape with a positioning pin 20 protruding from its side surface. This positioning pin 20 is lightly pressed downward by a spring 19 so that it can escape upward when it comes into contact with an obstacle.

As shown in FIG. 4, the cutter 9 is composed of a horizontal score line cutter 10 and a vertical score line cutter 16. The length of the cross-cut line cutter 10 is set to be the same as the length of the cross-cut line 6 of the cap. The width of the vertical score line cutter 16 is matched to the desired shape of the vertical score line. Vertical cut line cutter 1
6 is erected substantially perpendicularly to the end of the cutter 10 for transverse cutting lines.

When the cap is conveyed to this score line forming device, the spindle 13 rotates and descends, and the positioning pin 20 formed on the side thereof rotates exactly into the positioning notch 7 of the locking tongue 4. When the pins 20 come into contact with each other, as shown in FIG. is inserted into the cap. When the positioning pin 20 is not located in the positioning notch 7 of the interference bead 5, the positioning pin 20 is lightly pressed by the spring 19.
Do not apply excessive force to the interference bead 5 by displacing upward.

The spindle 13 into which the cap has been inserted is rotating and moving around the axis 14 at the center of the device. The speed at which the spindle 13 rotates is set such that the spindle 13 is aligned with the center axis of the device so that a predetermined position on the circumferential surface of the spindle 13 is always at a predetermined position of the cross cutting line cutter 10.
It is adjusted according to the speed of movement around 4.

(3) When this cap is sent to the cutter 10 for the transverse line, as shown in FIG.
A transverse cutter 10 is inserted into the protruding portion of the bridge-forming rib 3 of the cap.

(4) Thereafter, the cap is rotated by the spindle 13 and moved so as to be pressed along the cross-cut line cutter 10, thereby forming the cross-cut lines 6. Since the vertical score line cutter 16 is located at the end of the horizontal score line cutter 10, the vertical score line 8 is formed by the vertical score line cutter 16. Then, the cap of Example 1 is completed.

In the method for manufacturing the synthetic resin cap of this embodiment, when manufacturing the cap of Example 1, a positioning pin 20 that can pass through the positioning notch 7 of the interference bead 5 is provided on the circumferential surface. protruding spindle 1
3 into the cap, and lock the positioning pin 20 of the spindle 13 in the positioning notch 7 of the interference bead 5 of the cap or in the space 15 between the locking tongues 4. Since the vertical score line 8 is provided, the cap can be maintained at a predetermined angle when making the vertical score line 8.

Therefore, according to the manufacturing method of this embodiment, the vertical cut line 8 can be formed between the locking tongues 4 15 .

(Embodiment 3) FIG. 7 is a sectional view showing the cap of this embodiment. The difference between the cap of this embodiment and the cap of Embodiment 1 is that one of the locking tongues 4 is removed to form a wider gap 15 between the locking tongues 4 and a vertical cut line 8 is formed there. .

[0037] The same effects as the cap of Example 1 were obtained with the cap of this example.

[0038]

Effects of the Invention As explained above, in the synthetic resin cap of the present invention and the manufacturing method thereof, in the synthetic resin cap of claim 1, the interference bead is located between the locking tongues. In addition to providing a positioning notch, a transverse cut line is formed with both ends separated, and a vertical cut line is formed near one end of the transverse cut line and at a position between the locking tongue pieces. Therefore, when forming the vertical score line, the cap body can be maintained at a predetermined angle by using the positioning notch of the interference bead.

[0039] Therefore, in the synthetic resin cap according to the first aspect, the vertical cut line can be formed between the locking tongue pieces.

In the method for manufacturing a synthetic resin cap according to claim 2, when manufacturing the cap according to claim 1,
A spindle with a protruding positioning pin on the circumference that can pass through the positioning notch of the interference bead is inserted into the cap, and the positioning pin of the spindle is inserted between the positioning notch or the locking tongue. Since this method of producing a cap is characterized by providing a horizontal score line and a vertical score line in this locked state, when forming the vertical score line, there are The cap can be held at a predetermined angle by inserting the spindle positioning pin.

Therefore, in the method for manufacturing a synthetic resin cap according to the second aspect, the vertical score line can be formed between the locking tongue pieces.

[Brief explanation of drawings]

[Fig. 1] Cross-sectional view showing the cap of Example 1

[Figure 2] Schematic diagram showing the score line forming device used in Example 2

[Fig. 3] A perspective view showing the part where the spindle positioning pin of the device is provided.

[Fig. 4] A perspective view showing a vertical score line cutter and a horizontal score line cutter of the same device.

FIG. 5 is a schematic diagram showing the state when the positioning pin of the spindle is inserted into the positioning notch of the interference bead in the manufacturing method of Example 2.

[Fig. 6] A cross-sectional view showing the cross-cutting line cutter inserted into the cap using the same manufacturing method.

[Fig. 7] Cross-sectional view showing the cap of Example 3

[Fig. 8] Cross-sectional view showing a conventional cap

[Fig. 9] A cross-sectional view showing the cross-cut line cutter inserted into the cap using the conventional method.

FIG. 10 is a perspective view showing how a transverse line is formed on a cap using a conventional method.

[Explanation of symbols]

1 Top plate part 2 Skirt part 3 Bridge forming rib 4 Locking tongue piece 5 Interference bead 6 Crosscut line 7 Positioning notch 8 Vertical cut line 9 Cutter 10　Cutter for cross cutting line 11 PP band section 12 Main body 13 Spindle 14 Central axis of score line forming device 15 Between the locking tongues 16 Vertical cut line cutter 17 cradle 19 Spring 20 Spindle positioning pin 21 Starlet

Claims (2)

[Claims] 1. A top plate, a skirt that hangs down from the periphery of the top plate, a plurality of longitudinally extending bridge-forming ribs protruding from the lower inner surface of the skirt, and a plurality of bridge-forming ribs extending circumferentially downward from the bridge-forming ribs. A locking tongue provided to intermittently protrude inward in the direction, and an interference that protrudes inwardly less than the locking tongue along the inner surface of the skirt portion below the locking tongue. By inserting a transverse line in the skirt portion at the position where the bridge-forming rib is provided, the interference bead is formed in the cap divided into the upper main body portion and the pilfer-proof band portion. A positioning notch is provided between the locking tongues, and the crosscut line is formed with both ends separated, and a positioning notch is provided near one end of the crosscut line and vertically between the locking tongues. A synthetic resin cap characterized by a cut line. 2. When manufacturing the cap of claim 1, a spindle having a positioning pin protruding from the circumference that can pass through a positioning notch provided in the interference bead is inserted into the cap, and the spindle is A method for manufacturing a synthetic resin cap, characterized in that the positioning pin is locked between the positioning notch or the locking tongue, and in this state, a horizontal cut line and a vertical cut line are provided.