JPH0723168B2 - Easy open lid - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to an easy open lid, and more particularly, to an easy-open lid provided on the lid, which includes a metal lid and a plastic pull ring. The present invention relates to an improvement of an easy open lid that cuts a guide wire to open it.

(Prior Art) Conventionally, as an easy open lid for a bottle or the like, that is, as a lid that can be opened without using a special opening device, a top plate portion, a skirt portion continuous with this, and a part of the skirt portion have their ends. Pull ring provided so as to protrude from the edge,
There is known a metallic lid provided with a pair of unsealing guide wires extending from a root of the pull ring to a skirt portion or a top plate portion.

If the grip ring is made of the same metal as the lid body, it is possible to cut the finger with a sharp cutting edge, so in order to prevent this, a tongue piece is provided instead of the pull ring, It is already known to provide a pull ring made of plastic so as to be integrally connected to the tongue piece (Japanese Utility Model Publication No. 55-15885).

(Problems to be Solved by the Invention) A plastic pull ring has an advantage that it does not damage a fingertip when gripped with a finger, and the touch feeling when gripped with the finger is generally good. The opening workability is not always sufficient, and there arises such a drawback that the opening operation does not proceed smoothly due to bending at the connecting portion between the metal lid tongue and the plastic pull ring.

Furthermore, in order to obtain the same strength, a plastic pull ring needs to be thicker than a metal pull ring, and in order to prevent catching of the pull ring when transferring stoppered bottled products or carton packing, the pull ring is placed on the bottle side. There is also a problem that it is not always easy to insert a finger into the pull ring when the finger is placed close to.

Therefore, a technical problem of the present invention is that, in the easy open lid including the metal lid shell and the plastic pull ring described above, it is easy to insert a finger into the pull ring and the unsealing operation by cutting the unsealing guide wire is smooth. It is to provide a pull ring that is surely done.

(Means for Solving Problems) According to the present invention, in order to achieve the above object, a top plate portion,
A skirt portion continuing to this, a tongue piece provided in a part of the skirt portion so as to project from the end edge thereof, and a pair of unsealing guide wires extending from the root of the tongue piece to the skirt portion or the top plate portion. In an easy open lid comprising a metal lid shell provided with and a plastic pull ring provided integrally with the tongue piece, the plastic pull ring has an Orsen rigidity of 7000 to 15000 Kg / cm ² And a mounting portion that engages with a tongue integrally formed of high-density polyethylene or isotactic polypropylene having a surface hardness (Shore D scale) of 55 to 73, and is bent inward from the mounting portion. It consists of the upper part of the ring and the lower part of the ring bent outward from the upper part of the ring. Contact, and Iji Lee open end, characterized in that the ring top of the table the back of the finger is provided in contact with the size and shape is provided.

(Function) The plastic pull ring of the easy-open lid of the present invention includes a mounting portion that engages with a tongue piece, a ring upper portion that is bent inward from the mounting portion, and a ring that is bent outward from the ring upper portion. The first feature is that it is composed of a lower part and has a "angled" shape with a slight opening as a whole.
First, since this plastic ring has a shape in which the lower part of the ring is bent outward with respect to the upper part of the ring, it is easy to insert the fingertip. In addition, since the upper part of the ring is bent inward with respect to the tongue attachment part, it is easy to plug the ring along the neck and shoulder of the bottle,
Moreover, in this case, the attachment portion that transmits the opening force to the tongue piece can be held at the right angle or the most convenient state for opening the lid shell body skirt portion.

This plastic pull ring has an Olsen rigidity of 7000
By integrally molding with high-density polyethylene or isotactic polypropylene of 15000 Kg / cm ² ,
Even when opening, the "ring-shaped" shape of the entire ring is maintained and the opening operation is performed smoothly by shearing the opening guide wire.However, if the Orsen rigidity falls below the above value, the plastic will be opened during opening. If the pull ring is deformed and the opening force is not transmitted effectively, and if the value exceeds the above value, the plastic pull ring will be broken or broken.

The ring upper part and the ring lower part are provided in such a size and shape that the belly of the finger contacts the back of the ring lower part and the back of the finger contacts the front side of the ring upper part when the finger is inserted into the ring. As a result, the contact position of the finger on the upper part of the ring serves as a fulcrum, and the moment applied to the contact position of the fingertip on the lower part of the ring becomes a tensile stress that is transmitted from the mounting part to the tongue piece, effectively shearing the unsealing guide wire. To be done.

In summary of the above, according to the present invention, it is possible to easily insert a finger into the pull ring and to smoothly and surely perform the unsealing operation by cutting the unsealing guide wire.

If the angle between the mounting part and the upper part of the ring (α ... see Fig. 3) is less than 10 degrees, bending deformation occurs at the base of the tongue and the mounting part, and the opening force by the finger is applied to the tongue. If the angle (α) is larger than 60 degrees, the distance between the bin and the tab becomes large and the workability such as when inserting the carton case is significantly impaired. On the other hand, the angle between the upper part of the ring and the lower part of the ring (β ... see Fig. 3) is 60.
When the angle (β) is less than 20 degrees, it becomes difficult to insert the fingertip into the ring, and the fulcrum And the point of emphasis is too far apart, and it becomes difficult to open.

The plastic pull ring is made of high-density polyethylene or isotactic polypropylene having a surface hardness of 55 to 73, and it is the best in terms of tactile sensation when it is touched with a finger.

(Example) In FIG. 1 (perspective view), FIG. 2 (back perspective view) and FIG. 3 (side sectional view) showing an example of the easy open lid according to the present invention, the easy open lid is made of metal. It consists of a lid shell 1 and a plastic pull ring 2,
Further, as is known per se, an organic polymer liner 3 is provided on the inner surface side of the metallic lid shell 1.

The metal lid shell 1 includes a top plate portion 4, a skirt portion 5 having a relatively short width continuous with the top plate portion 4, and a tongue piece provided so as to be connected to a part of the skirt portion and project from an end edge thereof. 6
And a pair of unsealing guide wires 7 extending from the base of the tongue piece to the skirt portion. The lid shell of this specific example is a fold-open type easy open lid, and a pair of folding lines 8 are provided in a direction intersecting with the opening direction of the tongue piece 6. The metal lid shell 1 is formed by drawing a coated metal plate by a press or the like, and the central portion 9 of the top plate portion 4 is recessed, and a liner groove 10 for accommodating the liner 3 around the recess. Is formed. A small notch (notch) 11 is formed at the base of the tongue piece 6 to the skirt portion 5, and a pair of unsealing guide lines 7 are formed from the notch 11 to cross the skirt portion in the height direction. . The unsealing guide line 7 is generally composed of a weakening line (score), and is formed so that the distance between the skirts increases from the bottom to the top. The folding lines 8 are formed of slits (complete cutting lines) so that the opening can be easily performed. Although only one pair is shown in the drawing, two or more pairs can be provided if desired. At least the tip of the tongue piece 6 is provided with an engaging mechanism 12 for firmly engaging the tongue piece with the plastic pull ring 2 described later. The engagement mechanism 12 may be a hole through which the resin penetrates, an embossed portion where the resin and the metal engage with each other, an uneven portion, or the like, or may be a heat-bonded portion.

The skirt portion 5 can be functionally distinguished into three portions by the unsealing guide wire 7 and the folding line 8. The first strip-shaped portion 13 is a portion defined by the pair of unsealing guide wires 7 and is a portion to be peeled off from the container bead (not shown) at the first stage when unsealing, and is added to the tongue piece at the next stage. The opening force is transmitted to the top plate portion 4 and the liner 3. The second strip portion 14 is a portion defined by the unsealing guide wire 7 and the folding wire 8, and is a portion that is removed from the container bead in the second stage. Since the first strip 13 is removed and the second strip 14 has both ends as free ends, the second strip 13 can be easily removed from the container bead in the second stage. The third strip-shaped portion 15 is a portion having a length of about a half circumference that is divided by the pair of folding lines 8, and is a portion that is removed from the container bead in the third stage of opening. 6 and the top plate portion and the liner, the lever of the opening force exerts the removal.

A liner 3 is provided on the inner surface side of the metallic lid shell 1 so as to cover the circumferential portion to be engaged with the container opening (not shown). This circumferential portion corresponds to the circumferential liner groove 10 in the embodiment shown in the drawing, and the liner 3 is provided in this groove. The liner 3 and the metallic lid shell 1 are generally joined so as not to fall off.

The plastic pull ring 2 includes a mounting portion 16 that engages with the tongue piece 6, a ring upper portion 17 bent inward at an angle α with respect to the mounting portion, and an outer portion at an angle β relative to the ring upper portion. The ring lower part 18 is bent toward one side, and the ring upper part 17 and the ring lower part 18 form an integrated ring. On the back side of the ring lower part 18, there is a part 19 where the belly of the fingertip abuts when the finger is inserted into the ring.
The belt-like portion 20 on the front side of 17 has the belt-like portion 20 against which the back of the finger abuts. This pull ring 2 has an Olsen rigidity of 7,000 to 15
It is integrally molded of high density polyethylene or isotactic polypropylene of 000 Kg / cm ² , for example, by inserting a metal lid shell into a split mold and injection molding plastic, or by It can be produced by the extrusion compression molding method described in the proposed JP-A-63-302010. In addition, a pull ring is disclosed in JP-A-64-5829.
As described in Japanese Patent Laid-Open Publication No. 2003-242242, the pull ring may be manufactured separately from the metallic lid shell and heat-sealed to the shell.

The pull ring used in the present invention has an Olsen rigidity of 7,000 to
It is important that it consists of high-density polyethylene or isotactic polypropylene with a surface hardness (Shore D scale) of 15000 Kg / cm ² and 55-73. Particularly preferred high density polyethylenes have a density of 0.935 to 0.965 g / cc, a melt flow rate of 0.1 to 20 g / 10 min, and a _W / _N (molecular weight distribution) of 4.0 to 10. In this high density polyethylene or isotactic polypropylene,
0 to 5 parts by weight of colorant per 100 parts by weight of resin, 0 to 3
Parts by weight of lubricants or release agents may be added.

As the metal material forming the container lid shell, a sheet-shaped or foil-shaped surface-untreated steel (black plate), surface-treated steel, or a light metal such as aluminum is used. As surface-treated steel, chemical treatment such as phosphoric acid treatment or chromic acid treatment on the steel substrate; chemical conversion treatment such as electrolytic chromic acid treatment: electrolytic plating treatment such as electrolytic tin plating, electrolytic zinc plating, electrolytic chrome plating; molten aluminum Plating treatment: Examples include those subjected to hot dipping treatment such as hot tin plating. Of these, aluminum and aluminum alloys are preferable from the viewpoint of easy opening, and the thickness thereof is generally in the range of 0.15 to 0.25 mm.

At least the inner surface of the lid of these metal materials is coated with a protective paint. Suitable examples of paints are thermosetting resin paints,
For example, phenol-formaldehyde resin, furan-formaldehyde resin, xylene-formaldehyde resin, ketone-formaldehyde resin, urea formaldehyde resin, melamine-formaldehyde resin, alkyd resin, unsaturated polyester resin, epoxy resin, bismaleimide resin, triallyl cyanurate resin. , Thermosetting acrylic resin, silicone resin, oil resin, or thermoplastic resin coating, for example, vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinyl acetate copolymer partially saponified, vinyl chloride-maleic acid copolymer, Vinyl chloride-maleic acid-vinyl acetate copolymers, acrylic polymers, saturated polyester resins and the like. These fatty paints may be used alone or in combination of two or more.

As the organic polymer liner, all resins and elastomers that can be lined and have cushioning properties and sealing performance are used. A preferred liner material is a soft vinyl chloride resin that is spun in the form of a plastisol into the lid shell and then heat gelled into the liner. Of course, as the liner, a soft resin such as low density polyethylene or an elastomer can be used,
In this case, this resin is applied in a molten state and pressed to form a liner shape.

In the present invention, the ring 2 may have any shape as long as it is easy to insert a fingertip. For example, it can have any shape such as a circle, an ellipse, an oval, a rectangle with rounded corners, or a trapezoid with rounded rounds. The thickness, width or diameter of the ring is generally in the range of 1.0 to 3.0 mm.

INDUSTRIAL APPLICABILITY The lid of the present invention is widely applied to easy-open sealing of glass bottles and PET bottles. In this case, cover the bottle mouth with the lid,
Crimping is performed so that the lower end of the skirt portion engages with the lower side of the bottle mouth bead.

In FIG. 4 for explaining the opening operation of the container lid of the present invention, when a finger is inserted into the ring 2 to cause the ring, the belly of the fingertip abuts on the back part 19 of the ring lower part 18, and the ring upper part is contacted. The back of the finger abuts on the front part 20 of the table 17. As a result, the score 7 is smoothly sheared.

The lid of the present invention is not limited to the one shown in FIGS. For example, the unsealing guide wire 7 can be formed by passing over the skirt portion 5 also on the top plate portion 4 and shearing the unsealing guide wire 7 to perform unsealing.

(Example) Using an aluminum easy open cap having an oval-shaped plastic pull ring with a long diameter of 2 mm and a short diameter of 1 mm (ring inner diameter of about 18 mm), the openability was evaluated. .

Easy-open caps with plastic rings were prepared by changing the material of the ring tabs. The easy-open caps were capped with a bottle filled with hot water, and the openability was examined one day later.

The openability was measured by checking whether the open condition was good, whether the tab ring was bent and it was difficult to open the plug, and whether it did not break or break when opened with a metal hook when opening. The number of defects was checked.

Also, the cap was opened by hand and the feel at that time was examined.

(Effects of the Invention) According to the present invention, in an easy open lid including a lid shell made of metal and a pull ring made of plastic, the plastic ring and the Orsen rigidity of 7000 to 15000 Kg / cm ²
And a mounting portion that engages with a tongue integrally formed of high-density polyethylene or isotactic polypropylene having a surface hardness (Shore D scale) of 55 to 73, and is bent inward from the mounting portion. It is composed of a ring upper part and a ring lower part that is bent outward from the ring upper part, and when the finger is inserted into the ring upper part and the lower part, the back of the ring lower part comes into contact with the ball of the finger and the ring upper part. The size and shape that the back of the finger abuts on the surface of No. 3 does not damage the finger when gripping the ring, not only gives a good tactile sensation, but also makes it easy to insert the finger into the ring. The advantage that the opening operation is smooth and reliable and can be easily obtained with a relatively small force is achieved.

[Brief description of drawings]

1 is a perspective view of an example of an easy open lid of the present invention, FIG. 2 is a rear perspective view of the lid of FIG. 1, FIG. 3 is a side sectional view of the lid of FIG. 1, and FIG. It is explanatory drawing of the opening operation of the lid of FIG. 1 is a metal lid shell, 2 is a plastic pull ring, 3
Is a liner, 4 is a top plate, 5 is a skirt, 6 is a tongue piece,
Reference numeral 7 is an unsealing guide wire, 16 is a mounting portion, 17 is a ring upper portion, and 18 is a ring lower portion.

Claims (2)

[Claims] 1. A top plate portion, a skirt portion connected to the top plate portion, a tongue piece provided on a part of the skirt portion so as to project from an edge thereof, and a root of the tongue piece to the skirt portion or further the top plate portion. An easy open lid comprising a metal lid shell provided with a pair of extending unsealing guide wires and a plastic pull ring integrally provided on the tongue, wherein the plastic pull ring is Olsen rigidity is 7,000 to 15,000 Kg / cm ² and surface hardness (Shore D scale) is 55
To 73 to engage with the tongue integrally formed of high-density polyethylene or isotactic polypropylene, a ring upper portion bent inward from the attachment portion, and a ring upper portion outwardly. It is composed of a bent lower part of the ring, and the upper and lower parts of the ring are such that when the finger is inserted into the ring, the back of the lower part of the ring contacts the belly of the finger and the upper part of the ring contacts the back of the finger. And an easy open lid that is provided in a shape. 2. The angle (α) between the mounting portion and the ring upper portion is 10 to 60 ° and the angle (β) between the ring upper portion and the ring lower portion is
The easy-open lid according to claim 1, which has an angle of 20 to 60 °.