JPH03124566A - Easily openable lid made of metal - Google Patents

Abstract

PURPOSE:To improve the openability and impact resistance sealability by a method wherein among peripheral parts of a polymer liner, parts of lid opening-inductive lines and parts which are along the extended lines only are strongly bonded with a lid shell body, and the rest is not bonded or weakly bonded. CONSTITUTION:An easily openable lid is constituted of a metal lid shell body 1 and an organic polymer liner 2. The metal lid shell body 1 is equipped with a skirt part 4, a tab for lid opening 5 which is provided to be connected with a part of the skirt part, a pair of lid opening inductive lines which extend on the skirt part along the end edge of the tab for lid opening, and not less than one pair of folding lines which are provided on the skirt part in the direction which crosses with the lid opening direction of the tab. The liner 2 is applied in such a manner that the liner 2 covers the peripheral part of the inner surface of the metal lid shell body 1 which is engaged with the mouth part of a container. For the peripheral part for which the liner is applied and which is engaged with the mouth part of the container, at lid opening inductive lines 6 and parts which are along the extended lines, the liner 2 and the lid shell body 1 are strongly bonded with an adhesiveness which is not less than the breaking strength of the liner material, and at almost whole part 19, which is the rest of the peripheral part, the liner 2 and the lid shell body 1 are not bonded or weakly bonded.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to an easy-open metal lid, and more specifically, an easy-to-open metal lid that is opened by folding the skirt and top plate of the lid. Regarding improvements to improve the ease of opening and impact-resistant sealing of open lids.
do.

(Prior Art) Metal easy-open lids are widely used, which have an opening tab connected to the skirt portion of the lid, and are opened by lifting the tab.

The first type has a score that passes from the root through the skirt to the top plate or near the boundary between the top plate and the skirt, and the bag is opened by lifting the knob and tearing the score. However, this type of easy-open lid requires considerable force to tear the score.
There is a problem with ease of opening the package, and there is a risk of injury to fingers due to the sharp breakage of the score.

In the second type, an opening guide line is provided on the skirt along the edge of the knob, and a fold line is provided on the skirt in a direction approximately perpendicular to the opening direction of the knob to lift the knob. This type of easy-open lid is opened by first breaking the opening guide line and then folding the skirt and top plate at the fold line, which requires relatively little force to open and has a sharp score break. It has the advantage that no part of the body is exposed.

The present invention relates to an improvement of this second type of easy-open lid (hereinafter referred to as an easy-open lid when opened by folding).

(Problem to be solved by the invention) In the foldable easy-open lid, the opening guide wire is II! A portion of the skirt portion is peeled off from the bead of the container opening, and a free end is provided to the skirt strip portion between the opening guide line and the folding line to facilitate folding of this strip portion. Gives the effect of

However, when opening the package, a cut is often made in the top plate of the lid beyond the guide line, which may impair the ease of opening the package. Also, yRM? Breaking of the A conductor occurs with a relatively small force, but a relatively large force is required to fold the folded wire, so the force required for folding is minimized without affecting the sealing part. There is a need to reduce it.

Furthermore, in this fold-open type easy-open lid, the lower end of the skirt part is wrapped around and engaged with the lower end of the beat to achieve sealing, so the circumferential part of the top plate part corresponding to 0 parts of the container is There is also a problem in sealing performance that leakage easily occurs when deformation occurs due to impact such as being hit or dropped.

Therefore, one object of the present invention is to solve the above-mentioned drawbacks of the conventional fold-open easy-open lid, and to improve the ease of opening and impact resistance. 2V, to provide an easy-open lid with improved sealing performance.

(Means for Solving the Problems) According to the present invention, the top plate portion, the skirt portion connected thereto, the opening tab connected to a part of the skirt portion, and the opening tab. A metal lid shell body comprising a pair of opening guiding lines extending to the skirt portion along the edge, and one or more pairs of folding lines provided to the skirt portion in a direction intersecting with the opening direction of the tab; In the metal easy-open lid comprising an organic polymer liner applied to at least a circumferential portion of the inner surface of the MM body that is to be engaged with the container mouth.

The liner and the MR body are bonded to each other at a strength higher than the breaking strength of the liner material in the inner opening guide line of the circumferential portion or along its extension line, and in most of the other circumferential portion, the liner Provided is a metal easy-open lid with excellent ease of opening and impact resistance, characterized in that the lid shell and the lid shell are non-adhesive or weakly adhesive.

It is preferable that the non-bonded or weakly bonded region always exists within an angle of 40 degrees in any part of the circumferential part, and that the non-bonded or weakly bonded area is always present within an angle of 40 degrees in any part of the circumferential part, and that It is preferable that the liner and the lid shell have non-adhesion or weak adhesion in some parts.

(Function) Generally speaking, the metal easy-open lid of the present invention includes a metal lid shell and an organic polymer applied to at least the circumferential portion of the lid shell that is to be engaged with the container mouth. liner. The metal lid shell includes a top plate, a skirt connected to the top, an opening tab connected to a part of the skirt, and an opening tab extending to the skirt along the edge of the opening tab. It consists of a pair of opening guiding lines, and one or more pairs of folding lines provided on the skirt portion in a direction intersecting the opening direction of the tab.

Of the circumferential portion of the polymer liner, the liner and the lid shell are strongly bonded to each other with a strength greater than the breaking strength of the liner material in a portion along the opening guide line or its extension line, and the other circumferential portion is A feature of the present invention is that the liner and the lid shell are non-adhesive or weakly adhesive in most of the parts. This non-adhesion to weak adhesion area is 40% in any part of the circumferential portion.
It is best to make sure that it always exists within the same range.

First, by providing a strongly adhesive region between the liner and the lid shell, it is possible to prevent the liner from separating from the lid shell during the H manufacturing process, transportation stage, and capping process. In addition, by making the liner and the lid shell have a strong adhesive strength that exceeds the breaking strength of the liner material, especially in the part along the opening guide line or its extension line, the liner that is strongly bonded with the liner can cross the opening guide line when opening the package. to prevent cuts from being made on the top plate of the lid.
Makes opening work easier. Furthermore, if there are sharp cuts in the top plate, there is a risk of injury to fingers due to the cuts, but this will also be prevented.

In the present invention, the outer periphery of the liner and the lid shell are non-adhesive or weakly adhesive along the fold line, which makes it possible to fold the line along the fold line with a relatively small force and open the package. preferred for improving sexual performance.

In addition, by providing a non-adhesive or weakly adhesive area between the liner and the lid shell on the outer periphery between the strongly adhesive areas along the pair of opening guiding lines, the area is sufficiently strong to prevent the opening piece from being torn off. Even when provided with a relatively wide width, it is possible to prevent the sealing performance from deteriorating due to impact.

(Example) In Fig. 1 (perspective view), Fig. 2 (back view), and Fig. 3 (side sectional view) showing an example of the metal easy oven lid used in the present invention, this easy-open lid is , it consists of a metal lid shell 1 and an organic polymer liner 2. The metal lid shell l includes a top plate part 3, a relatively short skirt part 4 connected to the top plate part 3, an opening tab 5 connected to a part of the skirt part, and an opening tab. A pair of opening guiding lines 6 extending to the skirt part along the edge of the bag, and one or more pairs of folding lines 7 provided in the skirt part in a direction intersecting with the opening direction of the flap.

The metal lid shell 1 is formed by drawing and forming a painted printed metal plate, and the center part 8 of the top plate part 3 is recessed, and a liner groove 9 for accommodating the liner is formed around it. . In this embodiment, the opening tab 5 is formed integrally with a part of the skirt portion, and a gripping ring 10 is formed at the end thereof. A reinforcing rib 11 is provided through the opening tab 5 and the skirt portion 4 to prevent the tab from being deformed or twisted. A small notch 12 is formed at the base of the opening tab 5 to attach it to the skirt portion, and from this notch 12 a pair of opening guide lines 6 are formed that cross the skirt portion in the height direction. has been done. -111
The seal guide line 6 is composed of weakened lines (scores), and is formed so that the distance between them increases from the bottom to the top of the skirt portion. The folds g&7 consist of slits (complete cutting lines) to facilitate opening, and although only one pair is shown in Figure 1, two or more pairs can be provided if desired.

The skirt part 4 can be divided into three parts on the machine part by an opening guiding line 6 and a folding line 7. The first strip part 13 is a part divided by a pair of opening guide lines 6, and is a part that is torn off from the container beat (not shown) in the first stage when opening the bag, and is added to the peel in the next stage. a second strip 14 that acts to transmit the opening force to the top plate 3 and the liner 2;
is the part divided by the opening guiding line 6 and the folding line 7,
This is the part that is removed from the container beat in the second stage. Since the first strip 13 is removed and the second strip 14 has both ends free, it can be easily removed from the container pedestal in the second stage.

The third belt-shaped part 15 has a length of approximately half the circumference divided by a pair of fold lines 7, and is a part that is removed from the container beat in the third stage of opening, and is a part that is removed from the container beat in the third stage of opening. Removal is effected by levering the opening force applied through the piece 5 and the top plate and the liner.

A liner 2 is provided on the inner surface of the metal lid shell 1 so as to cover a circumferential portion that is to be engaged with a container opening (not shown). This circumferential portion corresponds in the embodiment shown to a circumferential liner groove 9 into which the liner 2 is applied. The liner 2 and the shell l are joined as already detailed.

This adhesion is achieved by applying a strong adhesive coating to the liner and a non-adhesive to weakly adhesive coating to the liner groove 9 in advance in a certain distribution. This is done by applying a liner on top.

In the present invention, in the circumferential portion where the liner is applied and which engages with the container opening, the liner 2 and the lid shell 1 are strengthened to a strength higher than the breaking strength of the liner material in the portion along the opening guide line or its extension line. The liner 2 and the lid shell l are not bonded or are weakly bonded in most of the other circumferential portions.

Some examples of strong adhesion and non-adhesion to weak adhesion patterns are shown in the fourth section.
As shown in the figure, they all have the above-mentioned adhesive structure in common, with strongly adhesive areas shown as outlines and non-adhesive or weakly adhesive areas marked with dots. In FIG. 4, the opening guide line or its extension line is indicated by 6', the folding line or its extension line 7', the outer peripheral edge of the liner is indicated by 16, the inner circumferential edge of the liner is indicated by 17, the strong adhesive area is indicated by 18, Non-adhesion to weak adhesion areas are indicated by 19, respectively.

In pattern A, a strongly adhesive region 18 is provided along the opening guide line or its extension line 6 degrees, and in other parts, a strongly adhesive region 18 is formed with a narrow width on the inner circumference of the liner. is considered to be a non-adhesive or weakly adhesive region 19.

In pattern B, on the contrary, a narrow width strongly bonded area 18 is formed on the outer periphery of the liner, and a narrow width strongly bonded area 18 is also formed on the inner periphery of the liner between the two open Mu conductive wires or the extension line 6.6°. An adhesive area 18 is formed.

In pattern C, there is a narrow strong adhesive area 1 on the outer periphery of the liner.
8 is formed in the same way as pattern B, but only in the part along the fold line or its extension 7°, the narrow part of the inner circumferential part of the liner becomes the strong adhesive area 18, and other areas The portion is a non-adhesive or weakly adhesive region 19.

Pattern D is similar to pattern A.

However, the portion facing the opening guide line or the extension line 6.6'' on the opposite side is a strong adhesive area 18.

Pattern E is similar to pattern A, but
A strong bonding area 18 is located along the fold line and the extension &17,7°.

In pattern F, the first-strength swing castles 18 are arranged in the form of narrow bands alternately on the outer circumference of the liner and the inner circumference of the liner.

In pattern G, small circular non-adhesive or weakly adhesive regions 19 are arranged in a circumferential manner, and band-shaped strong adhesive regions 18 are arranged so as to surround these non-adhesive or weakly adhesive regions 19.

In pattern H, as in pattern A, a narrow strongly bonded area 18 is provided on the inner circumference of the liner, but a large number of small circular non-bonded to weakly bonded areas 19 are arranged at small intervals in this strong bonded zone. has been done.

In pattern I, as in pattern B, is a narrow strongly bonded region 18 provided on the outer periphery of the liner?

A large number of small circular non-bonded to weakly bonded areas 19 are arranged at small intervals in this strongly bonded sphere.

In pattern J, as in pattern A and pattern B, a narrow strong adhesive area of 18.18'' is provided on both the inner periphery of the liner and the outer periphery of the liner, and a wide non-stick area is provided between them. Adhesion to weak adhesion areas are formed.

According to the pattern, the liner 2 is applied to the entire surface of the lid shell, with a strong adhesive area 18 at the center and a non-adhesive or weakly adhesive area 19 at the outer periphery.

Of course, it is understood that the arrangement of the strongly bonded region 18 and the non-bonded or weakly bonded region 19 in the present invention is not limited to the example shown, and that many changes can be made without departing from the wood quality of the present invention. Should.

In the present invention, the shape and ring of the strong adhesive area 18' along the opening guide line or its extension line may be various. FIG. 5 shows several examples of the shape of this strongly bonded region of 18°. In pattern A, the ring 20a of the strong adhesive area 18'
, 20b extend substantially parallel along the opening guide line or its extension line 6°, or are bent inward at a portion near the end thereof. This is to prevent the tendency of the cuts formed along the opening guide line to go inward (toward the direction in which the width becomes narrower). Pattern B
In this case, the outer loop 20b of the strongly bonded region 18' is similar to pattern A, but the inner loop 20a bends inward more quickly than in pattern A. In pattern C, the inner and outer loops 20a, 20b of the strong adhesive area 18' have a portion that first widens outward and then a portion that extends parallel to the opening guide line.

The formation of the strong adhesion area 18.18" and the non-adhesion to weak adhesion area 19 is done by applying a strong adhesion primer and a non-adhesion to weak adhesion coating on the metal lid shell l as shown in FIGS. 4 and 5. Provided in the pattern shown.

In Figures 6-A to 6-C showing an example of the bonded cross-sectional structure, first of all, in the first embodiment (Figure 6-A), the outer surface of the metal material 20 for the lid shell body is coated with an outer surface protective coating 21; A strongly adhesive primer layer 22 is provided on the entire inner surface, which also serves as an inner surface protective coating. On the inner surface protective coating and strongly adhesive primer layer 22, a non-adhesive to weakly adhesive coating is applied in a fixed pattern! 23 is provided as a masking layer,
An organic polymer liner 2 is applied on top of these. Thus, a strongly adhesive region is formed on the strongly adhesive primer, and a non-adhesive or weakly adhesive region is formed on the non-adhesive or weakly adhesive masking layer. Alternatively, as shown in Figure 6-8, the entire surface of the metal is coated with a coating that has no or weak adhesion to the liner.
Apply I23 only to the 1st swing area! A brimer coating 115I22 is provided which has adhesiveness to I23 and strong adhesion to the liner. Alternatively, as shown in FIG. 6-C, the inner surface of the metal 21 is coated with a 1 strong vibration coating 22, a non-adhesive to weakly adhesive coating 23s, and a side coating 23s corresponding to the non-adhesive to weakly adhesive area and the strongly adhesive area, respectively. - Printing, stamping, etc. are used to apply the paint or coating as a pattern, which may be provided in a pie-side relationship (juxtaposed relationship).

As the metal material forming the container lid shell, untreated steel (black plate) in the form of a sheet or foil is used.1 Light metals such as surface-treated steel and aluminum are used.0 As the surface-treated steel, steel base purchase is used. Chemical treatments such as phosphoric acid treatment and chromic acid treatment; Chemical conversion treatments such as electrolytic chromic acid treatment; Electrolytic plating treatments such as electrolytic tin plating, electrolytic zinc plating, and electrolytic chrome plating; Molten aluminum plating treatment; Melting such as molten tin plating. Examples include those that have undergone plating treatment. Among these, aluminum and aluminum alloys are preferred in terms of ease of opening, and their thickness is generally 0.15 to 0.
It is best to have an area of 25m5.

At least the surface of these metal materials that will become the inner surface of the lid is painted with an anti-N paint. Suitable examples of paints include 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-based resin, or thermoplastic resin coating, such as vinyl chloride-vinyl acetate copolymer,
Partially saponified vinyl chloride-vinyl acetate copolymer, vinyl chloride-maleic acid copolymer, vinyl chloride-maleic acid
These include vinyl acetate copolymers, acrylic polymers, and saturated polyester resins. These fatty paints may be used alone or in combination of two or more.

As the organic polymer liner, any resin or elastomer that can be lined and has cushioning and sealing properties can be used. A preferred liner material is a soft vinyl chloride resin, which is spun into the lid shell in the form of a plastisol and then heated to gel to form the liner.

An example of a suitable plastisol formulation is shown below.

Vinyl chloride resin 30-70% by weight plasticizer
30-70n hydrogenated resin component
2-12H stabilizer 1-5 17
Filler 0-20 Pigment
θ~5n Foaming agent
0~5 No.I lubricant 0~5
11 Vinyl chloride resins include vinyl chloride homopolymers as well as vinyl chloride and small amounts of comonomers 1 such as vinyl acetate, vinylidene chloride, styrene,
Copolymers with acrylic esters, methacrylic esters, and butadiene can also be used. The average degree of polymerization of these vinyl chloride resins is not particularly limited, and is generally preferably from 500 to 3,000. These vinyl chloride resins can be used in the resin composition of the present invention, whether they are relatively fine in particle size obtained by emulsion polymerization, relatively coarse in particle size by suspension polymerization, or a mixture thereof. .

Examples of plasticizers include plasticizers commonly used for vinyl chloride resins, such as phthalate plasticizers such as DOP and DOB, aliphatic dibasic acid ester plasticizers such as DOA and SoB, and phosphorus. Acid ester plasticizers, hydroxy polycarboxylic acid ester plasticizers, fatty acid ester plasticizers, polyhydric alcohol ester plasticizers, epoxy plasticizers, polyester plasticizers, etc. alone or in combination of two or more. Can be used.

This vinyl chloride resin composition may be blended with known ingredients such as stabilizers, fillers, pigments, and blowing agents as optional ingredients for liner formation according to known formulations.For example, Stabilizers include metal soap stabilizers,
Organotin stabilizers and organophosphate stabilizers are used as fillers.

Calcium carbonate, finely powdered silica, magnesium carbonate, talc, fired clay, etc. are used as pigments, titanium white, carbon black, etc. are used as pigments, and blowing agents are used as Azoshika-bonamide, 4,4-oxybis(benzenesulfonyl)hydrazide, etc. Examples of lubricants used include microcrystalline wax, paraffin wax, polyethylene wax, silicone oil, and fatty acid amide plasticizers.

Examples of paints that exhibit strong adhesion to vinyl chloride resin liners include vinyl chloride paints and acrylic paints, and examples of one-sided or weakly adhesive coatings include alkyd resin paints and inks.

Plastisol is applied by rotating the container lid shell and injecting it into the shell with a nozzle to the area where a seal is required between the container and the mouth of the container.Of course, if necessary, plastisol can be applied using a heated mold. It may be pressed into a predetermined gasket shape.

The plastisol applied to the container lid shell is then heated to gel and, if necessary, foam to form an unfoamed or foamed gasket.

When using a foam gasket, its apparent specific gravity is 0.4.
The container lid shell, preferably in the range of 1.2 to 1.2, can be easily manufactured by subjecting the coated metal material to per se known means, such as a series of stamping presses.

Polyethylene, ethylene-propylene copolymer, olefin elastomer, SBS instead of vinyl chloride resin
One or more types of various soft plastics and rubbers such as elastomer, butyl rubber, SBR, etc. can be used, and these are applied inside the shell in the form of a melt and stamped while cooling to form a predetermined liner shape. do. Alternatively, a solution or dispersion of these polymers may be applied and dried to form a predetermined liner. For olefin polymers and styrene polymers, it is preferable to use a paint containing an acid-modified olefin resin as a strongly adhesive paint, and a paint without it as a non-adhesive or weakly adhesive paint.

(Effects of the Invention) According to the present invention, in the foldable easy-to-unseal type oven lid, the liner and the lid shell have a breaking strength higher than the breaking strength of the liner material in the opening guide line or the part along the extension line thereof. By using strong adhesion and non-adhesion or weak adhesion in most of the other circumferential parts, it is possible to prevent cuts from being made in the top plate part and reduce the unsealing force from the second band-shaped part (Fig. 1 14). and is further effectively transmitted to the third strip (FIG. 1, 15), which acts to facilitate opening, thereby significantly improving the opening performance of the container lid, and further improving the above-mentioned limited strong adhesive area. Since the majority of the remaining area consists of non-adhesive or weakly adhesive areas, shocks are absorbed when the liner is in close contact with the container mouth, maintaining high sealing performance, resulting in easy opening and impact resistance. The optimal combination of the following will be guaranteed.

[Brief explanation of drawings]

FIG. 1 is a perspective view from the top side of an example of the container lid of the present invention, and FIG. 2 is a perspective view from the back side of the container lid of FIG. 1. FIG. 3 is a side sectional view of the container lid in FIG. FIG. 5 is an explanatory diagram showing several examples of the shape of the strongly adhesive area and ring marks along the opening guiding line in the container lid of the present invention; -C is a sectional view showing several examples of bonding structures between the M shell and the liner in the container lid of the present invention. 1 is a metal lid shell body, 2 is an organic polymer liner 3 is a top plate part, 4 is a skirt part, 5 is an opening piece, 6 is an opening guiding wire,
6゛ is its extension, 7 is the fold line, 18 is the strong adhesive area,
19 indicates non-adhesion to weak adhesion regions, respectively.

Claims (4)

[Claims] (1) A top plate part, a skirt part connected to the top plate part, an opening tab connected to a part of the skirt part, and a pair of opening tabs extending to the skirt part along the edge of the opening tab. A metal lid shell body comprising an opening guide line and one or more pairs of fold lines provided on the skirt portion in a direction intersecting with the opening direction of the pick, and engaging with at least the container mouth portion on the inner surface of the lid shell body. In a metal easy-open lid made of an organic polymer liner applied to a circumferential portion, the liner and the lid shell are lined with the liner in a portion along an inner opening guide line of the circumferential portion or an extension line thereof. The liner has strong adhesion that exceeds the breaking strength of the material, and the liner and lid shell have non-adhesion or weak adhesion in most of the other circumferential parts, making it easy to open and resistant. Easy-open metal lid with excellent impact resistance. (2) The easy-open lid according to claim 1, wherein the non-adhesive or weakly adhesive region always exists within an angle of 40 degrees in any part of the circumferential portion. (3) The easy-to-adhesive device according to claim 1, wherein the liner and the lid shell are not bonded or weakly bonded in a portion along the fold line or an extension line thereof in the circumferential portion. Open lid. (4) The easy-open lid according to claim 1, wherein there is a non-adhesion or weakly adhesive region between the liner and the lid shell between the pair of opening guiding lines or the strong adhesion along the extension line thereof.