JPS63152543A - Protective easy-open cover for score cutting end edge - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an easy-to-open lid that can protect the score cutting edge, and more particularly, to prevent injury to fingers during or after opening. This invention relates to an easy-to-open lid that has excellent rust prevention properties in the safety score part and stain resistance of the protective resin coating band.

(Prior Art) Conventionally, as easy-open can lids for canned goods, what is generally referred to as a full-open can is known. This can lid is provided with an opening score that defines the part to be opened on the can lid, and an opening tab is provided in the part to be opened, and when opening, the score is sheared to separate the part to be opened. It is removed from the area around the can lid. There is a sharp cut edge around this removed part, and accidents often occur where people get injured by touching their fingers. Many proposals have also been made to prevent the above-mentioned injuries by covering the can lid with a resin coating band applied in advance. For example, if a resin coating band is provided on the inner or outer side of the can lid so as to straddle the score, the resin coating band will also be broken when the score is broken, and the cut edge of the removed portion will also be left behind. The cut edge is also protected (Special Publication Act, 1974)
-20907 Publication, Special Publication No. 57-44540)
Or, a resin coating band is provided so as to straddle the score, but when the package is opened, the resin coating band is not broken and remains attached to the side of the part to be removed or the peripheral area that remains (special Publication No. 51-18872 and Utility Model Application No. 1887-
10728) is known.

(Problem to be Solved by the Invention) However, in the former type of resin coating band, in order to break the resin coating band at the same time as the score, the resin coating band is made relatively fragile or the coating is thin. In addition, since the resin coating is flush with the cut edge of the can lid, it is insufficient to prevent direct contact between the cut edge and fingers, and the protective effect is still insufficient. It can not be said.

In addition, for the latter type of easy-open lid with a resin coating band, an adhesive primer is applied to the part of the can lid where the resin coating band remains, and the primer is applied to the part of the can lid where the resin coating band will be peeled off. This requires complicated operations that require a lot of effort, such as leaving the device unattended, and has not yet been fully satisfactory in terms of productivity and cost.

Furthermore, when applying the above-mentioned paint without using any means, it is important to determine whether the resin coating band will adhere to the area where it is removed and transfer, or whether it will adhere and transfer to the peripheral area where it remains. ,
This results in a situation where it becomes difficult to strictly control.

Therefore, the present invention solves the above-mentioned drawbacks of the conventional easy-to-open lid with a protective resin coating band, and the protective resin coating band closely adheres to the lid, providing antirust and anticorrosion effects on the score portion, and providing protection. The resin coating band is always maintained in a clean state without dirt, and furthermore, it is possible to effectively prevent finger injuries caused by the broken part of the score part during or after opening.In particular, the resin coating band as a whole can be easily removed from the opening. It is an object of the present invention to provide an easy-to-open lid with a protective resin coating band that effectively prevents injury due to the resin coating band that is fixed to the part to be removed and protrudes outward.

(Means for Solving Problems) According to the present invention, an opening score that partitions an opening, an opening tab provided in the opening, and a protection provided so as to straddle the opening score on both sides thereof. In the easy-to-open lid equipped with a resin coating band, an organic resin coating is provided on the scored surface of the lid, and at least the organic resin coating on the portion where the protective resin coating band is provided is non-adhesive to vinyl chloride resin. The protective resin coating band is formed from a vinyl chloride resin plastisol containing an anchor filler or an amino resin, and the organic resin coating and the protective resin coating band are releasably bonded. We found that the task was accomplished.

Preferably, the opening tab is adhesively fixed to the lid via a thermoplastic adhesive comprising amide repeating units and/or ester repeating units.

(Function) The present invention makes the resin coating film on the paint can lid non-adhesive to vinyl chloride resin, and coats the resin coating band with plastisol of vinyl chloride resin containing an anchor filler. This method utilizes the knowledge that a peelable adhesive is formed between the painted can lid and the resin coating band when the gel is formed. Peelable adhesive means that two parts are bonded, but the adhesive force is controlled within a range that allows the two parts to be peeled off by the force of a human finger. In the case of the easy-to-open lid of the present invention, this peelable adhesion means that the adhesive strength at the interface is smaller than the cohesive failure force of the resin coating band, and that this adhesive strength is smaller than the opening force with a finger. You can say it's small.

By incorporating an anchoring filler such as heavy calcium carbonate, zinc oxide, or magnesium oxide into the vinyl chloride resin plastisol, the adhesive strength between the painted can lid and the resin coating band can be improved compared to that of a plastisol without the addition of an anchoring filler such as heavy calcium carbonate, zinc oxide, or magnesium oxide. It can be increased approximately 1.3 to 3.0 times compared to when using plastisol,
This makes it possible to form a releasable adhesive between the painted can lid and the resin coating.

The fact that peelable adhesion is made possible by the addition of an anchor filler was discovered as a phenomenon, and the reason for this has not yet been fully elucidated. However, the present inventors estimate the reason as follows. That is, first, the anchor filler blended into the plastisol exhibits an anchoring effect of forming a mutual locking portion between the coating surface of the painted can lid and the resin coating band. Second, the formation of a resin coating band using plastisol is carried out through heating and subsequent cooling of the vinyl chloride resin dispersed in the coating agent, and during this gluing and cooling, the resin coating band is It is believed that the thermal distortion that occurs is the cause of a significant decrease in the adhesive strength between the resin coating band and the coating film. The anchor filler blended into the plastisol acts to alleviate the thermal strain that occurs during gluing and cooling, and this is also recognized to contribute to the formation of peelable adhesive. Thirdly, metal compounds from group 1 of the periodic table, such as zinc oxide and magnesium oxide, form polymer radicals when heated, and either combine with the polymer radicals themselves or the polymer radicals recombine. It is known that cross-linking occurs during bonding, but it is thought that the vinyl chloride resin coating band-coating system targeted by the present invention also has the effect of improving chemical adhesion due to such cross-linking. .

Generally, the area where the can lid should be opened and the area around the can lid.

When distinguishing between coated adhesive paint and uncoated adhesive paint, or when using two types of paint with different adhesive strengths, maintain the adhesive strength between the periphery of one can lid and the resin coating band within the peelable adhesive area described above. However, in this case, it is possible to adhesively fix the resin coating band to the area where it is to be opened, but in this case, the resin coating band is not bonded to the lid in the outside part of the opening score of the can lid. Therefore, during retort sterilization or with the passage of time thereafter, corrosive components reach the score portion, causing rust on the score portion and pitting due to corrosion.

Furthermore, in terms of the corrosion resistance of can lids, it can be said that it is essential to provide a coating film with excellent corrosion resistance on the entire surface of the can lid, and it is also essential to provide a coating film with excellent corrosion resistance on the entire surface of the can lid. Ba,
This corrosion-resistant coating film is required to have excellent processability. From this point of view, it is desirable that the coating applied to the outer surface of the can lid be the same coating both on the opening area and the surrounding area of the can lid. It is also desirable in that it avoids complicated coating operations, simplifies the process, increases productivity, and lowers the cost of manufacturing one can lid.

According to the present invention, the coating film of the can lid is made non-adhesive to vinyl chloride resin, and the anchor filler is contained in the plastisol of the vinyl chloride resin, thereby improving the surface of the can lid. It is possible to form a releasable adhesion between the organic coating film and the opening score to maintain close contact or adhesion between the resin coating band and the can lid at the inner part of the opening score, that is, at the opening. It was found that on the outside of the score, the resin coating band and the can lid began to separate from each other.

When opening an easy-to-open can lid, the score is sheared by lifting the portion to be opened upward, except at the beginning of opening. On the other hand, in the resin coating band provided so as to straddle the score, a tensile force is generated in the radially outward direction, and this tensile force acts on the Di force between the coating band and the painted metal plate in the area where the opening is to be made. On the other hand, the score also acts as a peeling force between the coating band and the painted metal plate at the outer peripheral portion.

In the releasable adhesive structure of the present invention, adhesive failure is unlikely to occur in response to abrasion stress, but adhesive failure is likely to occur in response to peeling force. Separation occurs between the outer resin coating band and the periphery of the can lid, and the opening is performed with the cut edge of the opening covered with the resin coating band that protrudes outward. It is.

The coating band made of vinyl chloride resin plastisol used in the present invention has excellent mechanical properties peculiar to vinyl chloride resin and excellent resistance to corrosive components. The unique flexibility and cushioning properties of the molded product provide great protection against finger injuries, and the adhesion of the anchor filler contained therein also provides protection against scoring. Rust resistance and corrosion resistance are improved, and protection against injuries is also strengthened.

One problem that arises when forming a resin coating band from plastisol of carbonyl chloride-based resin is that when an easy-open lid equipped with such a coating band is subjected to heat sterilization in the form of a can,
Plasticizers and the like tend to bleed out on the surface of the coating, which tends to stick to the surface of the coating, resulting in the adhesion of dust, dirt, etc., and deteriorating the appearance characteristics. This tendency increases the adhesion of the resin coating to the paint film.
This is particularly noticeable when a tackifying agent is incorporated into the plastisol. According to the present invention, by incorporating an anchor filler into plastisol, the tendency to stick together can be suppressed,
The stain resistance of the resin coated band can be significantly improved, and its appearance characteristics can be made particularly good.

Furthermore, by blending an amino resin with an anchor filler in plastisol, it is possible to further improve the adhesive strength with the coating film while maintaining the stain resistance at an excellent level.

Structure of the lid FIG. 1 shows the top surface of the lid of the present invention, and FIG. 2 shows its side cross section.
In Figures 3-A and 3-B showing enlarged cross-sections of main parts, this can lid 1 has a through hole shown in Figures 3-A and 3-B, a metal material 2, and the entire outer surface thereof. External protective coating 3
a and an inner surface protective coating 3b applied to the entire inner surface thereof.

This lid 1 has a circumferential groove 4 on the outer periphery and an annular rim [5] on the groove.
The groove part 4 is provided with a sealing compound layer 7 that is sealed in sealing engagement with the can body flange (not shown) during double seaming with the can body flange (not shown). . Inside the annular rim portion 5 there is a portion 9 to be opened, demarcated by scores 8 . This opening portion 9 may substantially coincide with most of the glossy flannel portion 60,
- A part of the mother flannel part 6 may be an opening part. The score 8 is provided so as to reach the middle of the metal material 2 in the thickness direction through the hole shown in the enlarged sectional views of FIGS. 3-A and 3-B. An opening tab 10 is provided on this opening portion 9 in a manner described below. This opening tab 10 is
It has a score pushing tip 11 at one end, a gripping part (ring) 12 at the other end, and a fulcrum part 13 located between them and joined to the lid. In this embodiment, the fulcrum portion 13 is attached to a tab between the tip 11 and the ring 12.
Cut the cut 14, which is almost U-shaped, between the fulcrum part 13 and the tip 1.
1, and is formed in a tongue shape. The tearing tip 11 of the opening tab 10 is bonded with, for example, thermoplastic resin, to the opening portion 9 of the lid at the tongue-shaped fulcrum portion 13 so that its position almost matches the score 8 of the lid. It is fixed by being thermally bonded through the agent layer 16.

On the outer surface of the can lid 1, a resin coating band 1 for protecting the cut edge made of Nystomer, which will be described in detail below, is placed so as to straddle the score 8.
7 is provided. This resin coating band 17 is provided over the entire circumference of the score 8, and has a relatively small width on the outside of the score 8, as shown in Figure 3-8. It is also relatively wide on the inside. In addition, the resin coating band 17 has a score of 8 for opening.
It is understood that the inside of the groove, that is, the inside of the groove is also filled.

In the can lid of this specific example, the ring 1 of the opening tab 10
2 with your finger and lift it upward, this force is transmitted to the insertion tip 11 as a downward force via the fulcrum part 13, and a downward pushing force is applied to the score 8.
shearing begins.

Next, by further lifting the opening tab 1O, the opening portion 9 is also lifted upward, the shearing of the score 8 further progresses, and the opening portion is removed. In FIG. 4 illustrating this stage during the opening, it can be seen that at the time of shear opening with a score of 8, a step is created between the opening portion 9 and its outer peripheral portion 18.

Since the resin coating band 17 in the present invention is formed from plastisol of vinyl chloride resin containing an anchor filler, it is releasably adhesively bonded to the cover via the outer protective coating 3a of the lid. At the time of opening shown in FIG. 4, a tensile force acts on the resin coating band 17 that straddles the score 8, but this tensile force is not applied to the position of the opening portion 9, and the outer circumference 1
8 is the peeling force. In general, an adhesive structure is strong against stress but weak against peeling force, and thus the resin coating band 17 is effectively fixed in the opening portion 9, but the resin coating band 17 is fixed effectively in the opening portion 9. Peeling progresses between the cut edge 19 of the portion 9 and the outer circumferential portion 18 at the portion 20 that protrudes outward, and this protrusion portion 20 acts as a protector to prevent the cut edge 19 from coming into contact with fingers. It will also be understood that this will work.

In order to effectively adhesively fix the resin coating band 17 to the opening portion 19, a mechanism for mechanically engaging the two, for example, an annular stepped portion, is provided inside the opening score 8. (
It should be understood that the rim portion 21 and the varnished core 22 may also be provided.

Resin Coating Band According to the present invention, the resin coating band is formed by coating and gluing a plastisol of vinyl chloride resin containing an anchor filler. Plastisol is a paste made by mixing vinyl chloride resin and a plasticizer, which can be converted into a uniform elastic body by heating.

In the present invention, as the vinyl chloride resin.

In addition to vinyl chloride homopolymers, vinyl chloride and small amounts of comonomers 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 generally 500 to 3000 is convenient.
Ru. These vinyl chloride resins can be used for the purpose of the present invention, whether they are those with a relatively fine particle size obtained by emulsion polymerization method, those with relatively coarse particle size obtained by suspension polymerization method, or a mixture thereof.

As the plasticizer, the following plasticizers commonly used for vinyl chloride resins can be used.

1,7 tar acid ester phthalic acid diethylphthalic acid di-n-butylphthalic acid di-l-butylphthalic acid dihexylphthalic acid di-l-hebutylphthalic acid dioctyl (DOP) [n-octyl, 2-ethylhexyl, inoctyl (
oxo)] Phthal [di-1-hegutyl-1-nonylphthalate di-n-octyl-n-decyl phthalate didecyl [includes n-decyl, l-decyl] ] Butyl phthalate pendyl phthalate diphenyl phthalate dicyclohexyl phthalate dimethyl cyclohexyl phthalate dimethoxyethylphthalate dipoxyethyl ethyl phthalyl ethyl glycolate butyl phthalyl butyl glycolate 2. Aliphatic dibasic acid ester di-l-butyl adipate adipate/octyl [2-ethylhexyl, n-octyl] didecyl adipate [l-decyl, n-decyl] di(.-octyl-n-decyl) adipic acid Nopter dibenzyl cepatate [n-butyl] Dioctyl cepatate [2-ethylhexyl, n-octyl] azelaic acid-
Dioctyl n-hexyl azelate [2-ethylhexyl] 3. Phosphate ester diphenyl-2-ethylhexyl phosphate 4. Hydroxy polycargonic acid ester diethylacetyl tartrate triethyl acetyl citrate tributylacetyl citrate 2 etherhexyl citrate monoisoprobyl citrate triptyl citrate mono-, di-, tristeryl citrate 5. Fatty acid esters acetyl ricinoleate methyl rumitate ethyl stearate n-butyl stearate amyl stearate cyclohexyl oleate butyl hydrogenated rosin methyl ester 6. Polyhydric alcohol ester Glycerin triacetate Glycerin Torinopionate Glycerin Triptylate Glycerin Trihegutanoate Glycerin monoacetyl monostearate Glycerin Monoacetyl monolaurate Triethylene glycol dicaprylate Triethylene glycol dicaprate Pentanediol diisobutyric acid ester 7 ．． Epoxidized binder Epoxidized soybean oil Epoxidized castor oil Epoxidized linseed oil Epoxidized safflower oil Epoxidized linseed oil Fatty acid butyl epoxy Octyl stearate [both 1-octyl and 2-ethylhexyl] 3-(2-xenoxy)- 1.2 Epoxy pronocent 8. Polyester plasticizer Poly(diethylene glycol, terpene maleic anhydride adduct) ester Poly(propylene glycol, adivic acid) ester Poly(1.3 butanediol, adivic acid) ester Poly(propylene glycol, cepatic acid) ester Poly(1. 3-butanediol, cepatic acid) ester poly(propylene glycol, phthalic acid) ester poly(1,3-butanediol, phthalic acid) ester poly(ethylene glycol, adipic acid) ester poly(1,6-hexanediol, adipic acid) Ester acetylated poly(butanediol, adipic acid) ester [butanediol is 1,3- and 1,4-type] 9, other alkylsulfonic acid (C12-C2°) phenol ester alkylsulfonic acid (C12-C2o) cresol Ester hydrogenated polybutene pt.rt-butylphenyl salicylate chlorinated paraffin.

The anchor filler used in the present invention exhibits adhesive strength between the resin coating band formed from plastisol and the coating surface to which this plastisol is applied due to the aforementioned anchor effect. It is different from filler.

Suitable examples of fillers for this anchor include, but are not limited to, oxides, hydroxides or carbonates of metals from group 1 of the periodic table, such as zinc oxide, magnesium oxide, hydroxide, etc. These include magnesium oxide, calcium carbonate, magnesium carbonate, and basic magnesium carbonate. Among these, heavy calcium carbonate, zinc oxide, and magnesium oxide are particularly suitable. These Group I metal compounds of the periodic table have a particularly large effect on improving the adhesion between the resin coating and the paint film compared to other fillers, and also provide the resin coating with excellent stain resistance. be. This material also has the advantage of being white.

The particle size of the anchor filler used is not particularly limited, but
Generally 0.01 to 20μm, especially 0.05 to 15μm
Preferably, the particle size is m.

In a preferred embodiment of the invention, ground calcium carbonate and zinc oxide are used in combination. This combination provides the highest adhesive strength between the resin coating and the coating film, and also has a high effect of improving stain resistance. The ratio of the combination of the two can be varied, but the ratio of heavy calcium carbonate to zinc oxide is 1:0.01 to 1.
0. In particular, it is preferable to use a weight ratio of 1:0.1 to 1:5.

In the present invention, it has been found that by blending an amino resin with a plastisol together with an anchor filler, it is possible to improve the adhesion to the paint film after retort sterilization while maintaining an excellent level of stain resistance.

As the amino resin, a resin obtained by condensing an amino group-containing compound such as urea, melamine, or pendiguanamide with formaldehyde is used, and in particular, a resin obtained by condensing formaldehyde with an amino group-containing compound such as urea, melamine, pendiguanamide, etc. is used. Etherified amino resins are preferably used. These amino resins are commercially available in the form of a solution dissolved in a solvent such as methanol, butanol, quidylol, etc., and this solution is added to plastisol and used to form a resin coating.

In the present invention, the plasticizer is preferably used in an amount of 35 to 200 parts by weight, particularly 60 to 160 parts by weight per 100 parts by weight of the vinyl chloride resin, and if it is less than the above range, it is necessary for coating. On the other hand, if the amount exceeds the above range, the coating resin composition may become excessively flexible or have mechanical problems. Since the strength is too low, it is no longer suitable for the purpose of the present invention.

On the other hand, the anchor filler is preferably used in an amount of 1 to 90 parts by weight, particularly 5 to 70 parts by weight, per 100 parts by weight of the vinyl chloride resin, and within a range that maintains the fluidity of the final plastisol. That is, if the amount of the anchor filler blended is less than the above range, the effect of enhancing adhesive strength and improving stain resistance will be small, and if the amount is too much in the above range, the resin coating tends to become brittle.

In addition, when blending an amino resin, 100 parts by weight of vinyl chloride resin and 1 to 30 parts by weight, especially 2 to 20 parts by weight.
It is preferable to mix it in an amount of parts by weight.

When the amount of amino resin blended is less than the above range,
If the hot water resistance is sufficient to maintain a peelable adhesive state even after retort sterilization, the sol may become unstable or tend to increase in viscosity if the amount exceeds the above range.

The vinyl chloride resin composition for forming the covering band used in the present invention may contain additives known per se, such as stabilizers, other fillers, pigments, and blowing agents, as optional ingredients according to known formulations. I can do it. For example, stabilizers include metal soap stabilizers, organotin stabilizers, and organic phosphate ester stabilizers; pigments include titanium white, carbon black, etc.; and blowing agents include azocabonamide, 4. 4-oxybis(benzenesulfonyl)hydrazide is used.

The formulation of a suitable plastisol composition is shown below.

Vinyl chloride resin 100'ffi parts Polymer plasticizer 60~xsomt parts Foaming agent
O ~ 2 Stabilizer
0.5-4I lubricant 1-5 Anchor filler 5-70 N pigment
0 to 5 The metal material forming the can lid may be a surface-treated steel plate or an aluminum plate, but the present invention is an easy-to-open can made of a surface-treated steel plate that easily forms a rigid and sharp cut edge. Particularly useful for lids. Examples of display-treated steel sheets include electrolytic chromic acid-treated steel sheets (TFS), tin-plated steel sheets (tinplate), nickel-plated steel sheets, tin-nickel alloy-plated steel sheets, and aluminium-plated steel sheets, but are not limited to these examples. Metal materials are generally 0.10 to 0.40p
.

Particularly preferred is one having a thickness of 0.12 to 0.35 cm.

As the protective coating, any known protective coating that exhibits excellent adhesion to the metal materials mentioned above may be used. Examples of this paint include thermosetting or thermoplastic resin paints, such as modified epoxy paints such as phenol epoxy paints, amino epoxy paints, and epoxy ester paints; for example, vinyl chloride-vinyl acetate copolymers, vinyl chloride-acetic acid Vinyl or modified vinyl paints such as partially saponified vinyl copolymers, vinyl chloride-vinyl acetate-maleic anhydride copolymers, epoxy-modified 1-epoxyamino-modified-or epoxyphenol-modified vinyl resin paints; acrylic resin paints; oil-based Paints; alkyd paints; polyester paints; synthetic rubber paints such as styrene-butadiene copolymers, etc. are used.

The protective coating may be a single coating or a combination coating of an undercoat and a topcoat. Alternatively, a printing layer made of printing ink may be provided on the undercoat film, and a finishing varnish layer may be provided thereon.

In the present invention, at least the organic resin coating on the part where the protective resin coating band is provided is made of vinyl chloride resin.
The releasable adhesion referred to in the present invention cannot be formed between the protective resin coating band and the protective resin coating unless it is attached to the halved lead vinyl. Examples of external paints that are non-adhesive to vinyl chloride resins include alkyd/amino paints, oil-free alkyd/amino paints, and polymer saturated polyester/amino paints. Examples include glycester paints; epoxy ester paints; epoxy/amino paints; and epoxy/phenol paints.

The coating film applied directly onto the metal material is most preferably a Nixy paint. In other words, epoxy paints have excellent adhesion and processability with metal substrates, as well as excellent peel and adhesion properties with resin protective bands, and are also used to adhesively fix opening tabs to can lids. This is because it can also serve as an excellent adhesive primer. As an epoxy paint,
A combination of an epoxy resin component and at least one curing agent resin component that exhibits the curing action of the epoxy resin component, such as a phenol formaldehyde resin or an amino resin, is preferred, and the most preferred combination is a combination of various phenols and formaldehyde. A phenol-epoxy paint consisting of a derived phenol-aldehyde resin and a bisphenol-type epoxy resin, particularly a paint containing a phenol resin and an epoxy resin in a weight ratio of 90:10 to 5:95. It is. This paint also has excellent workability, and even when subjected to score processing, it has the advantage that the score processing portion has good corrosion resistance. This type of paint also has excellent adhesion to the polyamide adhesive used to fix the tab.

The thickness of the coating film is not particularly limited as long as the above-mentioned purpose is achieved, but generally speaking, it is desirable to have a thickness in the range of 0.2 to 30 μm, particularly 1 to 20 μm.

An opening score of 8 means that the residual thickness in the score part is 1/8 to 1/2 of the thickness of the base plate, and the absolute thickness is 0.2 to 0.
．． It is desirable that the length be 9 m, particularly in the range of 0.3 to 0.8 m.

In order to provide a resin coating band on the lid on which the opening score is formed, the above-described method of applying plastisol and gluing the applied plastisol is adopted. For application, a method is adopted in which plastisol is lined while rotating a lid or a lining nozzle. Gluing of plastisol is preferably carried out by heating at a temperature of 160 to 280°C for 10 seconds to 4 minutes. In order to perform lining reliably, it is desirable that the viscosity of the coating liquid be 40,000 cps or less.

The average thickness of the resin coating band in the width direction is generally 0.
0.005 to 0.5 m, especially 0.01 to 0.30 m, and from the point of view of the theory effect, the outward protrusion dimension from score 8 is 0.005 to 3 cm, especially 0.01
It is desirable to set it in the range of 20 to 20.

The opening tab may be made of the same type of material as the can lid or a different type of material. For example, it may be formed from a light metal plate such as aluminum or an aluminum alloy, or it may be formed from a steel plate with a surface treatment. Further, it may be made of a plastic material as long as it has sufficient rigidity.

When fixing the opening tab with a thermoplastic adhesive, a resin containing an amide repeating unit and/or an ester repeating unit is preferable, and a resin having a melting point or softening point in the range of 50 to 300°C, particularly 80 to 270°C is used. Polyamide, copolyester, or a blend of 2s or more thereof is used.

In the specific example shown in the drawings, the opening tab is fixed to the can lid by adhesive, but it goes without saying that it may also be fixed mechanically by conventional riveting.

(Effects of the Invention) According to the present invention, the coating film in the area where the resin coating band is provided is non-adhesive to vinyl chloride resin, and in forming the resin coating band covering the score portion of the paint can lid, By using a plastisol mixed with an anchor filler or an amino resin, it is possible to form a releasable adhesion between the coating film and the resin coating, and to improve the stain resistance of the resin coating formed from the plastisol. It is possible to significantly improve the properties and improve the appearance.

(Example) Examples 1 to 3 Ordinary tin-free steel (T
FS) An epoxy-phenol paint was applied to both sides of the plate so that the thickness after baking was 5 μm, and baking was performed at 210° C. for 10 minutes. This painted TFS plate was formed into a lid with a diameter of 211 using a press, and then a sealing cone (land) was applied to the curled part by a conventional method and dried.Then, the score residual thickness/steel plate thickness was 0.23 on the outer surface of the lid. A score for opening was formed so that the scores of Examples 1 to 3 shown in Table 1 were formed using a rotary lining method using a nozzle lining device on the score portion of the lid material obtained in this way. After applying the vinyl chloride plastisol, it was heated at 200°C for 2 minutes to provide a protective resin coating band.This resin coating was provided so as to straddle both sides of the opening score.Then, the thickness was 0.35 m + The opening tab made from the painted TFS board was made so that the distance from the score to the adhesive fulcrum was 6 m, and the width of the adhesive layer at the adhesive fulcrum was 5 m.
Bonding was carried out at 220° C. using a nylon 12-based film adhesive. Finally, the inner surface of the lid was spray-painted with epoxy-phenol paint and baked at 190°C for 4 minutes.

The easy-to-open lid thus obtained was double-sealed to the 211-diameter flange can body, then filled with dressing tuna, and after the flat lid was fully seamed, it was retorted at 116° C. for 90 minutes. After this retort treatment, the state of the protective resin coating and the contamination state of the protective resin coating band when the easy-open lid was opened was evaluated. The results are shown in Table 1.

Comparative Examples 1 to 2 The chlorination of Comparative Examples 1 and 2 shown in Table 1 was carried out by a rotary lining method using a nozzle lining device on the score portion of the lid material having the same opening scores as those of Examples 1 to 3. After applying the vinyl plastisol, it was heated at 200° C. for 2 minutes to form a protective resin coating band. These resin coatings are provided so as to straddle both sides of the opening score. Easy-to-open lids of Comparative Examples 1 and 2 were prepared by adhering tabs and correcting the inner surface of the lid in the same manner as in Examples 1 to 3. Finally, as in Examples 1 to 3, using these easy-to-open lids, a 211-diameter flange can body was double-sealed, then dressing tuna was filled as the contents, and the flat lid was seamed and heated to 116°C. Retort treatment was performed for 90 minutes. The state of the protective resin coating and the contamination state of the protective resin coating band at the time of opening the easy-open lid subjected to this retort treatment were evaluated. The results are shown in Table 1.

According to the results, in the easy-to-open lids of the present invention in Examples 1 to 3, an epoxy-phenol organic resin coating was provided on the outer surface of the lid, and the protective resin coating contained an anchor filler. It is formed from plastisol of a specific vinyl chloride resin. All of these easy-to-open lids have adhesive strength at the interface that can withstand retort processing or various types of no-undling, and the cohesive failure force of the resin is stronger than this adhesive strength. It is small compared to the opening force with fingers. Furthermore, in the lid of the present invention, the breakage (peeling) of the adhesive due to this opening force occurs only outside the opening score, and the adhesive is maintained in other parts.
, the covering band is bonded to the opening side. That is, since the cut edge of the opening is covered with the resin coating band when opening the opening, there is no injury to the hand and the opening can be performed safely. Also provided is an easy-to-open lid whose score portion has excellent rust prevention properties.

Another advantage of Examples 1 to 3 is that the protective resin coating band is always kept clean and free of dirt.

On the other hand, Comparative Example 1 and Comparative Example 2 are examples in which the amount of anchor filler is outside the range of the present invention. In Comparative Example 1, the amount of anchor filler was large, so the viscosity of the PVC plastisol was high;
This causes difficulty in nozzle lining work, and at the same time, the resin coating band is brittle even after forming the nozzle, and the force at the time of opening causes the coating band to partially break along the opening score, exposing the cutting edge of the opening. Therefore, there is a high risk of injury to your fingers. Comparative example 2
This is an example in which the anchor filler exceeds the lower limit of the present invention. In this case, the resin coating strip has already peeled off from the lid before the anchoring effect of the filler is applied. As in Comparative Example 1, since the cut edge of the opening is exposed, there is a high risk of injury to the fingertips.

Further, in this example, dust, dirt, etc. adhere to the resin coating band, and the appearance characteristics are extremely poor.

Example 4 Ordinary tin-free steel (TFS) with a plate thickness of 0.20 days
) Epoxy-phenol paint was applied to both sides of the board so that the thickness after baking was 5 μm, and baking was performed at 210° C. for 10 minutes. Next, apply white ink twice to indicate the opening method on areas other than the areas where the tab will be bonded, and then paint with Ai ink.Finally, apply overprint varnish (OP varnish) made of alkyd/amino paint to the area that will also become the tab bond. Baking was performed at 150° C. for 10 minutes. This coated and printed plate was formed into a lid with a diameter of 211 using a press so that the printed surface was the outer surface. Next, an opening score was formed on the outer surface of the lid so that the score residual thickness/steel plate thickness was 0.23. After applying the vinyl chloride resin-based plastisol of Example 4 shown in Table 2 by a rotary lining method using a nozzle lining device to the score portion of the lid material obtained in this way, it was heated at 200 ° C. for 2 minutes, A protective resin coating band was provided. This resin coating is provided so as to straddle both sides of the opening score. Then thickness 0.5
An opening tab made from a 0m painted aluminum plate,
Nylon 1
Bonded at 220℃ using 2 series film adhesive fc
Next, the inner surface of the lid was spray-painted with Nixy-phenol paint and baked at 190° C. for 4 minutes. Finally, a sealing compound was applied to the curled portion using a conventional method and dried.

The easy-to-open lid thus obtained was double-sealed to the 211-diameter flange can body, then filled with dressing tuna, and after the flat lid was seamed, it was retorted at 116°C for 90 minutes. . After this retort treatment, the state of the protective resin coating and the contamination state of the protective resin coating band when the easy-open lid was opened was evaluated. The results are shown in Table 2.

In the easy-open lid of the present invention, an OP varnish is provided on the outer surface of the lid, and a protective resin coating is formed from a specific plastisol of vinyl chloride resin containing an anchoring filler and an amino resin. Since the plastisol of the present invention contains an anchor filler, even if it is provided on a different coating surface than in Examples 1 to 3, a releasable adhesive can be formed in the same way. Therefore, when the opening is opened, the cut edge of the opening is covered with the resin coating band, so that there is no injury to the hands and the opening can be carried out safely. Furthermore, there is provided an easy-to-open lid in which the score portion has excellent rust prevention properties, and the protective resin coating band is always kept clean and free of dirt.

Example 5 After baking epoxy phenol-urea paint on both sides of a regular electrolytic tin-plated steel plate with a thickness of 0.23cm, the thickness was 5cm.
tm, and baked at 210° C. for 10 minutes. This painted electrolytic tin-plated steel plate is 3
A sealing compound was applied to the curled portion by a conventional method and dried. Next, the various processes of shivering, bubble reforming, butane, scoring, and staking were performed using a press, and an opening tab made from a 0.50 piece painted aluminum plate was fixed to the lid with rivets.

Note that the score created at this time is score residual thickness / steel plate thickness = 0.
．． 15, and has the shape of a circle with a diameter of 58 cm. The scored portion of the lid thus obtained was coated with the vinyl chloride plastisol of Example 5 shown in Table 2 using a nozzle lining device using a rotary lining method, and then heated at 200°C for 2 minutes to protect it. A resin coating was formed. These resin coatings are provided so as to straddle both sides of the opening score. The inner surface of the lid was corrected in the same manner as in the other Examples to create an easy-to-open lid of Example 5. Finally, double-seal this easy-open lid to the 307-diameter 7-run can body, fill it with boiled tuna, and tighten the flat lid.
Retort at 6℃ for 90 minutes. After this retort treatment, the state of the protective resin coating when the easy-open lid was opened was evaluated.

The evaluation results are shown in Table 2.

These results show that not only the opening tabs of Examples 1 to 3 are fixed with adhesive, but also the easy-opening lids of Example 5 in which the opening tabs of Example 5 are fixed with conventional rivets can be protected. As long as the resin coating is made of a specific vinyl chloride resin plastisol containing an anchoring filler, the cut edge of the opening will be supported by the resin coating band when opening, so there will be no hand injury and safety. The effect of opening can also be obtained. Furthermore, there is provided an easy-to-open lid that has excellent rust prevention properties in the score portion and in which the protective resin coating band is always kept clean and free of dirt.

Comparative Example 3 Using a nozzle lining device, a nozzle lining device was used on the score portion of a lid material having the same opening scores as in Examples 1 to 3, and the adhesive agent of Comparative Example 3 shown in Table 2 was applied. After applying vinyl chloride plastisol, heat at 200°C.
was heated for 2 minutes to form a protective resin coating band. These resin coatings are provided so as to straddle both sides of the opening score. An easy-to-open lid of Comparative Example 3 was prepared by adhering the tab and correcting the inner surface of the lid in the same manner as in Examples 1 to 3. Finally, as in Examples 1 to 3, using these easy-to-open lids, double-seal a 211-diameter 7-lung can body, fill it with dressing tuna, and tighten the flat lid. A retort treatment was performed at ℃ for 90 minutes.

The state of the protective resin coating and the contamination state of the protective resin coating band at the time of opening the easy-open lid subjected to this retort treatment were evaluated.

The protective resin coating strip is heated and sterilized to produce treed odor, such as plasticizers and adhesive agents, which makes the coating strip free of dust, dirt, etc.
Dirt etc. were attached, and the appearance characteristics were significantly deteriorated.

[Brief explanation of the drawing]

Figure 1 is a top view of the easy-to-open lid of the present invention, Figure 2 is a sectional view of the can lid in Figure 1 taken along line A-A', and Figures 3-A and 3-B are essential. FIG. 4 is a diagram illustrating a stage in the middle of opening. DESCRIPTION OF SYMBOLS 1... Lid, 2... Metal material, 3a... External protective coating of the lid, 3b... Inner protective coating of the lid, 4... Circumferential groove, 5... Annular rim Part, 6... ri mother flannel part, 7...
・Sealing tips 249 Hood layer, 8...Score, 9・
... Portion to be opened, 10 ... Opening tab, 11
... Score insertion tip, 12... Gripping part (ring), 13... Fulcrum part, 14... U-shaped cut, 1
5... Connection portion, 16... Thermoplastic resin adhesive layer, 1
7... Cut edge protection covering band, 18... Outer periphery, 1
9... Cut edge, 20... Portion protruding outward, 2
1...Rim part, 22...Number varnish core.

Claims (9)

[Claims] (1) An easy-to-open lid that includes an opening score that divides the opening, an opening tab provided at the opening, and a protective resin coating band that extends over both sides of the opening score, the lid comprising: The entire score processed surface is coated with an organic resin coating,
At least the organic resin coating on the portion where the protective resin coating band is provided is non-adhesive to vinyl chloride resin, and the protective resin coating band is formed from plastisol of vinyl chloride resin containing an anchor filler, and An easy-to-open lid characterized in that an organic resin coating film and a protective resin coating band are releasably bonded. (2) The easy-opening lid according to claim 1, wherein the anchor filler is an oxide, hydroxide, or carbonate of a Group II metal of the periodic table. (3) The easy-to-open lid according to claim 1, wherein the anchor filler comprises heavy calcium carbonate, zinc oxide, magnesium oxide, or a combination of two or more thereof. (4) The easy opening according to claim 1, wherein the plastisol comprises a composition containing 35 to 200 parts by weight of a plasticizer and 1 to 90 parts by weight of an anchor filler per 100 parts by weight of a vinyl chloride resin. Sexual lid. (5) The easy-to-open lid according to claim 1, wherein the organic resin paint is an epoxy paint. (6) The easy-to-open lid according to claim 1, wherein the opening tab is adhesively fixed to the lid via a thermoplastic adhesive comprising an amide repeating unit and/or an ester repeating unit. (7) The easy-to-open lid according to claim 1, wherein the protective resin coating band is bonded to the lid so as to remain bonded to the opening side when opened. (8) An easy-to-open lid that includes an opening score that divides the opening, an opening tab provided at the opening, and a protective resin coating band that extends over both sides of the opening score, the lid The entire score processed surface is coated with an organic resin coating,
At least the organic resin coating on the part where the protective resin coating band is provided is non-adhesive to vinyl chloride resin, and the protective resin coating band is made of plastisol of vinyl chloride resin containing an anchor filler and an amino resin. An easy-to-open lid characterized in that the organic resin coating film and the protective resin coating band are peelably adhesively bonded to each other. (9) A patent claim in which the plastisol comprises a composition containing 35 to 200 parts by weight of a plasticizer, 1 to 90 parts by weight of an anchor filler, and 1 to 30 parts by weight of an amino resin per 100 parts by weight of a vinyl chloride resin. The easy-to-open lid according to item 1.