JP2977100B2 - Synthetic resin cap and method of manufacturing the same - 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 made of a synthetic resin having an inner surface of a cap provided with a tongue for engaging with a step of a bottle mouth, and a method of manufacturing the cap.

[0002]

2. Description of the Related Art FIG. 9 shows a conventional synthetic resin cap.

This device is disclosed in Japanese Patent Application Laid-Open No. 2-296666, and is formed by a top plate 1 and a cylindrical skirt portion 2 hanging down from the periphery thereof. A plurality of bridge forming ribs 3 project from the lower inner surface.

The skirt portion 2 below the bridge forming rib 3
Further, a locking tongue piece 4 and an interference bead 5 are provided on the inner surface of the lower part of. The locking tongue pieces 4 are provided at intervals in the circumferential direction and are formed so as to protrude inward. Further, the interference bead 5 is formed so as to protrude inward from the locking tongue 4 below the locking tongue 4 and less than the locking tongue 4.

At the position where the bridge forming rib 3 is provided on the skirt portion 2, a transverse score line 6 is formed along the entire circumference along the circumferential direction. The upper body 12 and the lower pill fur proof band (hereinafter abbreviated as a PP band) 11 are formed by the transverse cut line 6 in the cap.
It is divided into and.

When the cap having the above configuration is mounted on the bottle mouth, the locking tongue 4 of the PP band portion 11 is locked on the step of the bottle mouth. When the cap is turned to open, the main body 12 rises while the PP band 11
Cannot rise, so that the bridge-forming ribs 3 connecting the two are cut and the plug is opened. As a result, the ring-shaped PP band portion 11 remains at the bottle mouth as evidence of the opening.

The cap having the above structure has been manufactured by the following steps (1) to (3).

(1) A cap in which the transverse score line 6 is not formed is molded using a synthetic resin such as polyethylene or polypropylene.

(2) The rotating spindle 17 is inserted into the cap formed as described above, as shown in FIG. The cutter 10 is inserted into the portion where the bridge forming rib 3 is provided.

(3) The cap rotates as the spindle 17 rotates. Then, as shown in FIG. 11, when moving along the blades of the cutter 10 for the horizontal cutting line, the horizontal cutting line 6 is formed in the cap.

[0011]

In such a conventional cap, after opening, the ring-shaped PP band portion 11 remains at the bottle mouth. When the PP band portion 11 remains in the bottle mouth as described above, if a bottle made of a synthetic resin such as a PET bottle is to be recycled, a different material may be mixed. To avoid these obstacles in recycling bottles,
There has been a demand for a cap that makes it clear that the PP band portion 11 does not remain in the bottle mouth and is opened. That is, the horizontal score line 6
There is a demand for a cap in which both ends are separated from each other and a vertical cut line is formed at the end, that is, a so-called one-score type pill fur proof cap. According to this cap, when the cap is opened, the PP band portion 11 is strip-shaped and comes off the bottle mouth in a state of being connected to the skirt portion 2.

When the cap having the above structure, that is, the cap having the locking tongue 4 formed on the inner surface of the PP band portion 11 is a one-score type cap, the vertical cut line is engaged with the locking tongue 4. It must be formed between the tongue pieces 4 (hereinafter simply referred to as a gap between the locking tongue pieces 4). However, in the conventional manufacturing method, the vertical score line may be formed at the position where the locking tongue piece 4 is provided. When the position of the vertical cut line overlaps with the position of the locking tongue piece 4 as described above, there is an obstacle that cutting of the vertical cut line is disturbed by the locking tongue piece 4 and the stopper 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 and a method for manufacturing the same, in which a vertical cut line can be reliably provided in a gap between the locking tongue pieces 4.

[0014]

According to the first aspect of the present invention, the locking tongues are formed at regular intervals, and the shape of the regular polygonal column has the same number or about the same number of sides as the locking tongues. By forming the upper outer shape of the cap, further forming the horizontal cut line with both ends separated, and forming a vertical cut line near one end of the horizontal cut line and between the locking tongue pieces. The above problem was solved.

According to a second aspect of the present invention, there is provided a method for manufacturing a cap made of a synthetic resin, comprising the steps of: The above problem was solved by holding the cap by inserting the cap into the hole of the base portion and providing a horizontal cut line and a vertical cut line in this state.

[0016]

In the cap made of synthetic resin according to the first aspect, the locking tongues are formed at equal intervals, and the upper outer shape of the cap is formed in a regular polygonal column shape having the same number or about the same number of sides as the locking tongues. As a result, the positional relationship between one side or corner of the regular polygonal column formed on the cap and the locking tongue or the gap between the locking tongues is common to all sides and corners. . Therefore, according to the cap of the first aspect, when forming the vertical cut line, the side or the corner formed in the shape of a regular polygonal prism on the upper part of the cap is directed in a predetermined direction, so that the locking tongue piece and the locking tongue piece Can be directed in a predetermined direction.

In the method for manufacturing a synthetic resin cap according to the second aspect, the regular polygonal column formed at the upper portion of the cap is inserted into the hole of the base portion of the cap positioning jig having the same shaped hole. In this state, the horizontal cutting line and the vertical cutting line are provided, so that the cap positioning jig is cut so that the gap between the locking tongues of the cap is at a position where the vertical cutting line is inserted. If it is set in the forming device, the cap inserted into the hole of the cap positioning jig, regardless of the angle at which it enters in the circumferential direction, the gap between its locking tongues makes a vertical cut line Come to position. Therefore, the gap between the locking tongue pieces can be directed in a predetermined direction via the cap positioning jig.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A synthetic resin cap and a method for manufacturing the same according to the present invention will be described below in detail with reference to the drawings. The same components as those of the conventional example are denoted by the same reference numerals, and the description will be simplified.

(Embodiment 1) FIG. 1 is a sectional view showing a cap of this embodiment. The interference bead 5 located at the lower part of the skirt portion 2 is provided with a notch so as to correspond to the gap 15 of the locking tongue 4.

A regular polygonal column 7 having a regular polygonal shape is formed on the upper part of the skirt 2. This regular polygonal pillar part 7
Is a portion composed of the top plate portion 1 and a regular polygonal side surface hanging down from one side thereof.

FIGS. 2A and 2B are cross-sectional views of the cap according to the present embodiment. FIG. 2A is a cross-sectional view showing a state in which the locking tongue pieces 4 are arranged, and FIG. FIG. Part A in (a) and part B in (b) are overlapping parts when the cap is viewed from above. In the cap of this embodiment, twelve locking tongue pieces 4 are provided at equal intervals in the circumferential direction. The regular polygonal column 7 is formed into a regular polygon having the same number of sides as the locking tongue pieces 4, that is, a regular dodecagon. One locking tongue 4 is provided for one side of the regular polygonal column 7. 2 (a) and 2 (b), as can be seen, the arrangement of the locking tongue piece 4 present in the part A with respect to the side b present in the part B and the A ′ corresponding to the side b ′ present in the part B ′ The arrangement of the locking tongues 4 present in the part is identical. In other words, the positional relationship of the locking tongues 4 with respect to each side of the regular polygonal prism 7 and the positional relationship of the gap 15 between the locking tongues 4 are the same on all sides.

As shown in FIG. 1, a transverse cut line 6 is formed along the circumferential direction at the projecting portion of the bridge forming rib 3 of the cap. The transverse score line 6 is not formed on the entire circumference of the cap, and both ends are separated.

In the vicinity of one end of the transverse score line 6 and PP
A vertical cut line 8 is formed in a gap 15 between the locking tongue pieces 4 of the band portion 11.

In the synthetic resin cap of this embodiment, the locking tongues 4 are formed at equal intervals, and a regular polygonal column portion 7 having the same number of sides as the locking tongues 4 is provided at the upper part of the cap. Therefore, the positional relationship of the locking tongues 4 or the gap 15 between the locking tongues 4 with respect to one side or corner of the regular polygonal column portion 7 is common to all sides and corners. Therefore, according to the cap of the present embodiment, when forming the vertical cut line 8, the sides or corners of the regular polygonal column portion 7 on the cap are oriented in a predetermined direction, so that the locking tongue 4 and the locking tongue The gap 15 between the four can be oriented in a predetermined direction.

Therefore, in the cap made of synthetic resin of the present embodiment, the vertical cutting line 8 is connected to the gap 15 between the locking tongue pieces 4.
Can be reliably formed.

Further, in the cap in which the vertical cut lines 8 are formed as described above, when the cap is opened, the PP band portion 11 is strip-shaped and detached from the bottle mouth in a state of being connected to the cap body 12, so that the bottle can be easily recycled. Furthermore, when the consumer drinks the contents directly from the bottle, the risk of injury is eliminated because the PP band portion 11 does not remain in the bottle mouth.

Further, since the notch is provided in the interference bead 5 so as to correspond to the gap 15 between the locking tongue pieces 4 located at the lower part of the skirt portion 2, the gap 15 and the notch portion of the interference bead are formed. When viewed in cross section, the wall thickness is uniform. Therefore, in the synthetic resin cap of this embodiment, the vertical score line 8
Has become easier to set.

Example 2 A synthetic resin cap having the structure described in Example 1 can be manufactured by the following steps (1) to (4).

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

(2) Next, the cap is sent to a cutting line forming apparatus for forming a horizontal cutting line 6 and a vertical cutting line 8. As shown in FIG. 3, this cut line forming apparatus is schematically constituted by a starter turret 20 for feeding a cap, a cap positioning jig 13 for holding and rotating the cap, and a cutter 9 for forming a cut line in the cap. I have.

As shown in FIG. 4, the cap positioning jig 13 has a base portion 19 in which a hole 22 having the same shape as the shape of the regular polygonal column portion 7 on the upper portion of the cap is formed. The base 19 is rotated by the rotation shaft 18. The cap positioning jigs 13 are arranged one by one below the pocket 25 of the start turret 20.

As shown in FIG. 5, the cutter 9 includes a cutter 10 for a horizontal cutting line and a cutter 16 for a vertical cutting line. The length of the horizontal cutting line cutter 10 is appropriately set so as to correspond to the length of the horizontal cutting line 6 of the cap. The height of the vertical cutting line cutter 16 is
It is not less than the width of the PP band portion 11. The vertical slitting line cutter 16 stands substantially vertically at the end of the horizontal slitting line cutter 10.

The cap positioning jig 13 holding the cap is rotating around the center shaft 21 of the cutting line forming apparatus while rotating. The rotation speed of the cap positioning jig 13 is adjusted in accordance with the speed at which the cap positioning jig 13 moves around the center axis 21 of the cutting line forming apparatus so that a predetermined position in the circumferential direction is always at the position of the vertical cutting line cutter 16. ing. That is, as shown in FIG.
The vertical cutting line cutter 16 is formed at the corner Y of the polygonal column-shaped hole 22 of FIG.
The rotation speed of the cap positioning jig 13 and the speed of movement around the center axis 21 of the score line forming device are adjusted so that the cap positioning jig 13 abuts. As described above with reference to FIG. 2, the positional relationship between the locking tongues 4 with respect to one side and the corner of the regular polygonal column portion 7 and the positional relationship with the gap 15 between the locking tongues 4 are all sides. And the same in the corners. Therefore, regardless of the angle at which the cap is inserted into the hole 22 of the positioning jig 13, the cutter 16 for the vertical cutting line that comes at the corner Y of the hole 22 of the cap positioning jig 13 is located between the locking tongue pieces 4 of the cap. It will be inserted into the gap 15.

When the caps are fed to the score line forming apparatus, the caps are inserted one by one into the pockets 25 of the starter turret 20. Then, the regular polygon part 7 of the cap falls into the hole 22 of the cap positioning jig 13. At this time, even if the regular polygonal column portion 7 of the cap does not match the hole 22 of the cap positioning jig 13, the regular polygonal column portion 7 and the hole 22 of the positioning jig 13 Are matched in a short time, and the regular polygonal prism 7 enters the hole 22. Thereafter, the spindle 17 descends from above, enters the cap, and holds the cap together with the cap positioning jig 13.

(3) When the cap is fed to the portion of the cutter 10 for the horizontal cutting line, the cutter 10 for the horizontal cutting line is inserted into the bridge forming rib 3 of the skirt portion 2 as shown in FIG. Then, when the cap is rotated by the cap positioning jig 13 and the spindle 17 so as to be pressed along the cutter 10 for the horizontal cutting line, the horizontal cutting line 6 is formed.

(4) Since the vertical cutting line cutter 16 is located at the end of the horizontal cutting line cutter 10, the vertical cutting line 8 is formed by the vertical cutting line cutter 16.

In the method of manufacturing a cap made of a synthetic resin according to this embodiment, a hole 22 having the same shape as the regular polygonal column 7 formed at the upper portion of the cap is formed at the time of manufacturing the cap according to the first embodiment. Cap positioning jig 13
The cap is held by inserting it into the hole 22 of the above. In this state, the horizontal cut line 6 and the vertical cut line 8 are provided, so that the gap 15 between the locking tongue pieces 4 of the cap is located at the position where the vertical cut line 8 is inserted. If the cap positioning jig 13 is set so as to come into contact, the cap inserted into the hole 22 of the cap positioning jig 13 enters the cap positioning jig 13 at any angle in the circumferential direction. Also, the gap 15 between the locking tongue pieces 4 comes to the position where the vertical cut line 8 is inserted. That is, the gap 15 between the locking tongue pieces 4 of the cap can be directed in a predetermined direction via the cap positioning jig 13.

Therefore, according to the manufacturing method of the present embodiment, the vertical cut lines 8 can be reliably formed in the gaps 15 between the locking tongue pieces 4.

(Embodiment 3) FIGS. 8A and 8B are cross-sectional views of a cap according to the present embodiment. FIG. 8A shows a state in which locking tongues 4 are arranged, and FIG. The shape of the part 7 is shown. The M portion in (a) and the N portion in (b) are portions that overlap when the cap is viewed from above.

The cap of the present embodiment differs from the cap of the first embodiment in that the number of sides of the regular polygonal column 7 is a divisor of the number of the locking tongues 4. In the cap of this embodiment, 24 locking tongue pieces 4 are provided, and the regular polygonal column 7 is formed into a regular dodecagon. Locking tongue 4 against one side of regular polygonal column 7
Are two.

As can be seen by comparing FIGS. 8A and 8B, the arrangement of the locking tongue piece 4 present in the M section with respect to the side n existing in the N section and the arrangement of the side n ′ existing in the N ′ section are described. The arrangement of the locking tongue pieces 4 existing in the M 'portion is the same. In other words, the positional relationship of the locking tongue pieces 4 or the gap 15 between the locking tongue pieces 4 with respect to the sides or corners of the regular polygonal prism 7 at the top of the cap is common to all sides and corners.

In the cap of the regular polygonal column portion 7 provided with the diagonal sides of the retaining tongue piece 4 of the present embodiment, the retaining tongue piece 4 is always integral multiple times with respect to one side of the regular polygonal column portion 7. Located, regular prism 7
Since the positional relationship of the locking tongue 4 with respect to one side is common to all sides of the regular polygonal column portion 7, the same effect as the cap of the first embodiment can be obtained in the cap of the present embodiment. .

In the first embodiment, the cap in which the notch is provided in the interference bead 5 so as to correspond to the gap 15 between the locking tongues 4 is exemplified. If the shape of 16 is devised, an appropriate vertical score line 8 can be formed.

[0044]

As described above, according to the synthetic resin cap of the present invention and the method of manufacturing the same, the locking tongues are formed at equal intervals in the synthetic resin cap of the first aspect. Since the upper outer shape of the cap is formed in the shape of a regular polygonal prism having the same number or a diagonal number of sides as the stopper tongue, the locking tongue or the space between the locking tongues with respect to one side or corner of the regular polygonal column on the top of the cap. The positional relationship with the gap becomes common to all sides and corners, and the tongue piece and the locking tongue piece are formed by directing the sides or corners of the regular polygonal column at the top of the cap in a predetermined direction when forming the vertical cut line. The gap between the locking tongues can be oriented in a predetermined direction.

Therefore, according to the first aspect of the present invention, the vertical cut line can be reliably formed in the gap 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,
Insert the upper part of the cap into the hole of the base part of the cap positioning jig where the hole with the same shape as the shape of the regular polygonal pillar part formed on the upper part of the cap is held, and in this state, the horizontal cut line and the vertical cut Since the cap positioning jig is set in the cut line forming device so that the gap between the locking tongues of the cap is at the position where the vertical cut line is inserted, it is possible to insert the cap into the hole of the cap positioning jig. Regardless of the angle at which the inserted cap is inserted with respect to the circumferential direction, the gap between the locking tongues is located at a position where a vertical score line is made.

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

[Brief description of the drawings]

FIG. 1 is a perspective view showing a cap according to a first embodiment.

FIGS. 2A and 2B are views showing a cap according to the first embodiment, in which FIG. 2A is a cross-sectional view showing an arrangement of locking tongue pieces, and FIG.

FIG. 3 is a schematic configuration diagram showing a score line forming apparatus.

FIG. 4 is a partially sectional perspective view showing a cap positioning jig constituting the apparatus.

FIG. 5 is a perspective view showing a cutter constituting the apparatus.

FIG. 6 is a perspective view showing a state in which a cutter for a horizontal cutting line is inserted into a cap.

FIG. 7 is a cross-sectional view for explaining the manufacturing method according to the second embodiment.

8A and 8B are views showing a cap according to a third embodiment, in which FIG. 8A is a cross-sectional view showing the arrangement of locking tongue pieces, and FIG. 8B is a cross-sectional view showing the shape of a regular polygonal prism.

FIG. 9 is a sectional view showing a conventional cap.

FIG. 10 is a cross-sectional view showing a state when a cutter for a transverse score line is inserted into a cap by a conventional manufacturing method.

FIG. 11 is a perspective view showing a state where a transverse score line is formed in a cap by a conventional manufacturing method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Top plate part 2 Skirt part 3 Bridge formation rib 4 Locking tongue piece 5 Interference bead 6 Horizontal cutting line 7 Regular polygonal column part 8 Vertical cutting line 9 Cutter 10 Horizontal cutting line cutter 11 PP band part 12 Body part 13 Cap positioning Jig 14 Cradle 15 Gap between locking tongues 16 Cutter for vertical cut line 17 Spindle 18 Rotation axis of cap positioning jig 19 Base part 20 Start turret 21 Center axis of cut line forming device 22 Hole of cap positioning jig 25 Starter turret pocket

Claims (2)

(57) [Claims] 1. A top plate portion and a skirt portion hanging down from a peripheral edge thereof, a plurality of longitudinally extending bridge forming ribs protruding from an inner surface of a lower portion of the skirt portion, and a circumference below the bridge forming ribs. A locking tongue provided so as to intermittently and inwardly project in the direction, and a transverse score line is provided at a position of the skirt portion where the bridge forming rib is provided, thereby forming an upper body. In the cap defined by the pillow-puff band portion and the pillow-puff band portion, the locking tongues are formed at equal intervals, and the shape of a regular polygonal prism having the same number or the number of sides as the locking tongues is Forming the upper outer shape of the cap, further forming the horizontal cut line with both ends separated, and forming a vertical cut line near one end of the horizontal cut line and between the locking tongue pieces. Synthetic resin key Cap. 2. The method of manufacturing a cap according to claim 1, wherein the cap is held by being inserted into a base portion of a cap positioning jig in which a hole having the same shape as the regular polygonal prism of the outer shape of the cap is formed. A method for manufacturing a synthetic resin cap, characterized by providing a horizontal cut line and a vertical cut line in this state.