WO1987007581A1

WO1987007581A1 - Easy-to-open can lid able to protect cut edge of score and producing process thereof

Info

Publication number: WO1987007581A1
Application number: PCT/JP1987/000382
Authority: WO
Inventors: Hiroshi Matsubayashi; Masanori Aizawa; Michio Watanabe; Takashi Shimizu; Tamotsu Ikegami
Original assignee: Toyo Seikan Kaisha, Ltd.
Priority date: 1986-06-13
Filing date: 1987-06-12
Publication date: 1987-12-17

Abstract

Easy-to-open can lid provided with a score for opening which partitions an opening and a protective resin coated band provided so as to cover the opposite ends of a tab for opening located at the opening and the score for opening, and particularly aims at providing an easy-to-open lid which has an excellent anticorrosiveness at the part of the score and, further, an excellent staining resistance of a protective resin coated band, and manufacture thereof. The easy-to-open lid of the invention is, for example, provided with an organic resin coating on the external surface of said lid, where said protective resin coated band is formed of plastisol of vinyl chloride resins containing at least on kind of additive selected from the group consisting of fillers for anchorage, tackifiers, and amino resins and, further, said organic resin coating and protective resin coated band are separably adhered to each other.

Description

Meika

Name of the willow invention

Easy-to-open lid that can protect the scoring edge and its manufacturing method

The present invention relates to an easily openable can lid with a protected cutting edge, and more particularly to the fact that cans can be easily opened without using special equipment. Also, when opening, the sharp cut edge is covered with resin that extends outward beyond the edge, so that injuries such as fingers are stopped at 55; -It relates to an easy-open can lid provided with a function. The present invention particularly relates to an easily-openable can lid having excellent scoring resistance of a score portion and, more particularly, excellent contamination resistance of a protective resin coating. Furthermore, the present invention also relates to a method for producing the above easy-open can lid.

Conventional technology

Conventionally, as an easily-openable can lid for canning, what is generally called a full open can is known. This can lid has an opening score that defines the opening area on the can lid, and an opening tab that is installed at the opening area. However, when opening, the score is sheared, and the opening should be removed from the periphery of the can lid. There is a sharp cutting edge around the part that has been removed. An accident can occur if you injure yourself by touching it.

By covering the sharp cutting edge formed by scoring with the resin coating 施 applied to the can lid in advance, the above-mentioned injuries can be prevented. Many proposals have been made. For example, the resin coating 設け is provided on the inner side or outer side of the can lid so as to straddle the score, and the resin coating 带 is also broken and removed with the breakage of the score. (See Japanese Patent Publication No. 54-20907 and Japanese Patent Publication No. 57-44), so that both the cut edge of the part where the part is cut and the cut edge of the peripheral part that remains are protected. No. 540) and a resin-coated band is provided so as to straddle the score, but when opening the resin-coated band, the resin-coated band is not broken and is removed from the side or Those which are left so as to adhere to the remaining peripheral part (Japanese Patent Publication No. 51-18872 and Japanese Utility Model Publication No. 60-107272) are disclosed. Are known .

However, in the former type of resin coating, the resin coating is relatively fragile so that the resin coating can be broken at the same time as the score. In addition to the need for a thin or thin coating, the resin coating is flush with the cut edge of the can lid, so that direct contact between the cut edge and the finger is not possible. It is not enough to prevent it, and the protective effect is still not enough.

In addition, the latter type of resin-covered band-equipped Apply the adhesive primer to the part of the can lid where the resin-coated band remains, and do not apply the adhesive primer to the part where the resin-coated tea is separated. It required a lot of troublesome and complicated operations, and was still not satisfactory in terms of productivity and cost. In addition, when the above-mentioned paint separating means is not used, the resin coating 付着 adheres to the part to be removed and migrates or remains on the peripheral part. This makes it difficult to precisely control whether or not to adhere to the surface.

In addition, the fixing of the conventional opening tab of the easy-opening lid is performed by rivet and soft tapping, and this process is generally performed by a pub or a bubble tub. Form, button, scoring, and sticking in this order are indispensable for preventing scoring damage and positioning, so use the opening tab. After installation, it was necessary to apply protective resin to the score.

However, it is necessary to position the tip (nose) for tearing of the opening tab on the score at the opening start part. The scoring part could not be provided with an organic resin coating, and it was difficult to completely cover the entire scoring part. This results in incomplete protection of the cut edges after scoring breaks, and the problem of pitting corrosion in uncoated scoring areas. Occurs.

To speed up the coating of the resin coating, increase the rotation speed of the lid or the lining gun and finish the application in a short time. However, if the rotation speed of the lid or the lining gun is increased, an uncoated portion will be created in the shadowed portion of the opening tab, which will increase the safety and safety. This will cause problems in the corrosion and corrosion protection of the score.

In addition, in the application process of the organic resin, the resin is also applied to the tip of the opening tab, and when the rotation speed of the lid or the lining is increased, some of the resin that has collided with the tab is removed. They are flicked off and adhere to the chuck wall of the lid, adversely affecting subsequent processes, especially the process of closing the lid.

Furthermore, in the spin coating process described above, the distance between the tip of the gun nozzle and the lid must be separated by at least the thickness of the tab. When the rotation speed of the gun is increased, the organic resin immediately before adhering to the lid is scattered outward by centrifugal force, and the width of the organic resin coating becomes uneven, resulting in poor appearance. The value of the product will be greatly reduced. Summary of the Invention

Therefore, an object of the present invention is to eliminate the above-mentioned drawbacks of the conventional easy-open lid with a protective resin coating, and the protective resin-covered band adheres tightly to the lid to cover the score portion. In addition to providing a protective and anti-corrosive action, the scoring of the finger at the opening or after the opening can be effectively prevented by the scoring of the finger. Provide an easy-to-open lid with a protective resin coating that can be effectively prevented from being injured by a resin coating band that is entirely fixed to the part to be removed by the opening and protrudes outward. To do

Another object of the present invention is to provide a protective resin-coated tea easily-openable lid in which the protective resin-coated tea is always kept in a clean and clean state. '

Still another object of the present invention is to provide a resin coating on the outer side of the opening score when opening, while the opening portion of the can lid and the periphery of the can lid have the same outer coating film. In order to provide an easy-to-open can lid, the peeling is surely generated in the can between the shell and the periphery of the can lid and the opening cut edge is covered with a resin-covered band. .

Another object of the present invention is to provide an easy-opening can lid provided with a mechanism in which the resin coating is securely fixed to a portion to be opened when opening.

Yet another object of the present invention is to provide a method for producing the above-mentioned easily-openable can lid without the above-mentioned drawbacks in the conventional method.

According to the present invention, the opening score that defines the opening, the opening tab provided in the opening, and the opening score are straddled over both side edges of the opening score. In an easy-opening lid provided with a protective resin coating provided on the surface, an organic resin coating is provided on the outer surface of the lid, and the protective resin coating is a filler for anchor. An organic resin formed from a vinyl chloride tea resin blastisol containing at least one additive selected from the group consisting of tackifiers and amino resins Paint An easy-opening lid is provided in which the film and the protective resin coating are separated and adhered.

According to the present invention, the opening score that defines the opening, the opening tab provided in the opening, and the opening score are straddled along both sides of the opening score. In an easy-opening lid provided with a protective resin coating provided in this way, the scoring surface of the lid is entirely coated with an organic resin coating, and at least the protective resin The coating of the organic resin at the portion where the coating is provided is non-adhesive to the vinyl chloride resin, and the protective resin coating is coated with an anchor filler and a Z or amino resin. An easy-opening lid characterized in that it is formed from a vinyl chloride resin blastisol and that the organic resin coating and the protective resin coating are separated and adhered to each other. Is provided.

According to the present invention, further, an opening score provided in the can lid to define an opening portion, an opening tab provided in the opening portion, and an opening portion are provided. The opening of the can lid in the easy-opening can lid consisting of the resin coating for protecting the cutting edge provided so as to span the upper part of the score between the can lid and the periphery of the can lid Both the sliding portion and the periphery of the can lid have the same outer surface coating, and the inside of the opening score of the can lid has a can lid to prevent the resin coating band from moving in the radial direction- A resin-covered engagement mechanism is provided.

2 0 0 g / ^/ c ffl>A> 10 s / cm… (1)

T> 20 g / cm… (2) Two

T〉 one (A — C) .. · (3)

In the three equations, A is the adhesive strength per unit width (cm) between the resin-coated band and the lid, T is the strength per unit width (cm) of the resin-coated layer, and C is a constant. (900).

The resin coating satisfies the following conditions.When opening, there is a gap between the resin coating outside the scoring opening and the periphery of the can lid, and the cut edge of the opening is resin coated. An easily-openable can lid is provided that can be opened while covered with a fairy.

According to the present invention, there is further provided a step of reshaping the lid material into the lid and engraving at least one score to define a portion to be opened in the lid, and opening the lid. Prior to fixing the scoring tab, the scoring cutting edge protection resin, which also serves as scoring prevention, covers the scoring completely and straddles the scoring. From the step of applying the coating, and the step of bonding and fixing the opening tab to the opening to be opened so that the tip for tearing is positioned on or near the coated score. An easy-opening lid manufacturing method characterized by comprising:

Description of the drawings

FIG. 1 is a top view of the easy-opening lid according to the present invention, and FIG. 2 is a cross-sectional view taken along line A--A 'of the can lid in FIG. FIGS. 3 —A and 3 —B are cross-sectional views of the main part, FIG. 4 is a view for explaining a stage in the middle of opening, and FIG. 5 is a view obtained in the first step of the present invention. 6 is a cross-sectional view of FIG. 5,

FIG. 7 is an enlarged sectional view of a main part of FIG. 6,

FIG. 8 is a top view of the lid obtained in the second step of the present invention, FIG. 9 is a side sectional view of FIG.

FIG. 10 is an enlarged sectional view of a main part of FIG.

Each reference number has the following meaning:

1 Lid, 2 Metal element village, 3a Lid outer protective coating,

3 b "'Inner protective coating on lid, 4 ... circumferential rim, 5 * ... annular rim, 6 ... knurl', 7 ♦.ゥゥ 8 8 8 8 8 8 層, 1 2 ····························································································· 16 ° Layer, 17 ··· Cut edge protection coating 带, 18 ”· Outer edge, 19 ··· Cut edge 緣, 20 ·“ Outwardly protruding part, 21 ·· ”rim , 22 ... The varnish core.

Preferred Embodiment of the Invention

In the present invention, the resin coating on the coating can lid is made non-adhesive to vinyl chloride resin, and the resin-coated band is used as an anchor filler and a tackifier. Or a blastosol coating and gel of vinyl chloride resin containing amino resin It is based on the knowledge that a releasable bond is formed between a paint can lid and a resin-coated band when formed by chemical modification. In the case of detachable bonding, the bonding is performed between two parts, but the adhesive force is within the range where the two parts can be separated by the force of a human finger. Say what is being controlled. In the case of the easy-opening lid of the present invention, the detachable bonding means that the bonding strength at the interface is smaller than the cohesive breaking force of the resin-coated band, and the bonding strength is still smaller than the adhesive strength. Therefore, it can be said that it is smaller than the opening force of the above.

Generally, a distinction is made between the application and non-application of the adhesive paint at the opening of the can lid and the periphery of the can lid, and two types of paints having different adhesive strengths are used respectively. When the resin coating is to be installed, the resin coating is adhered and fixed to the opening to be opened while maintaining the adhesive strength between the periphery of the can lid and the resin-coated band in the above-mentioned detachable bonding area. However, in this case, the resin coating 未 is not adhered to the lid outside the scoring opening of the can lid. During or after the sterilization of the tolt, the corrosive component reaches the scoring part, causing the scoring part to be damaged, corroded, and immediately perforated. Produce food.

Furthermore, in terms of the corrosion resistance of the can lid, it can be said that it is indispensable to provide a coating with excellent corrosion resistance on the entire surface of the can lid. Under harsh processing conditions, this corrosion resistant 'coating film needs to have excellent workability. Ten

Required. From this point of view, it is desirable that the coating applied to the outer surface of the can lid should have the same coating both at the opening and at the periphery of the can lid. The use of the same coating film is also desirable in that it avoids complicated coating operations, simplifies the process, increases productivity, and lowers the cost of manufacturing can lids.

According to the present invention, the coating film of the can lid is made non-adhesive to the vinyl chloride resin, and the filler for anchors is contained in the blastol of vinyl chloride tea resin. By incorporating a tackifier or an amino resin, it is possible to form a peelable adhesive with the organic coating film on the surface of the can lid. At the portion inside the score, that is, at the opening, the close contact or adhesion between the resin-coated band and the can lid is maintained, and outside the score, the separation between the resin-coated band and the can lid is maintained. Was found to be easy to proceed.

When opening the easy-open can lid, the score is sheared by lifting the portion to be opened upward except at the start of opening. On the other hand, the resin coating 設け provided so as to straddle the score generates a tensile force in the radial direction, and this tensile force is applied to the coating band and the painted metal plate in the portion to be opened. On the other hand, on the outer peripheral portion outside the score, the outer peripheral portion acts as a pulling force between the coating band and the painted metal plate. The peelable adhesive structure of the present invention hardly causes adhesive failure against shear stress. The resin coating 接着 is fixed to the opening, and the resin coating 外側 outside the opening scoring 蓋 and the periphery of the can lid. The opening is made in a state where the cut edge of the opening is covered with a resin coating band that protrudes outward from the opening. .

The coating from the vinyl chloride resin blastisol used in the present invention has excellent mechanical properties unique to vinyl chloride resins and excellent barrier properties against corrosive components. In addition, because of the flexibility and cushioning characteristic of the molded product made of blastisol, the effect of protecting against finger injuries is also provided. And the scoring effect of the filler for anchors, tackifiers or amino resin contained therein. The anti-corrosion and anti-corrosion properties are improved, and the protective action against injuries is further enhanced.

In the present invention, it is desired to form a peelable bond by including an anchor filler in a vinyl chloride resin blastisol. No. That is, the filler for anchor such as heavy carbon dioxide, zinc oxide, magnesium oxide, etc. is contained in the vinyl chloride resin blastizol. As a result, the adhesive strength between the paint can lid and the resin coating is increased to about 1.3 to 3.0 times as compared with the case where unblended blastisol is used. This allows the adhesive to be formed between the painted can lid and the resin coating. Can be achieved.

The fact that release adhesives can be achieved by the addition of an anchor filler has been discovered as a phenomenon, and the reason is still to be elucidated. Has not been reached. However, the present inventors presume the reason as follows. In other words, first, the filler for annealed compounded in the blastisol forms a mutual locking portion between the coating surface of the paint can lid and the resin coating. It shows the anchoring effect. Second, the formation of the resin coating by the blastisol is carried out through the gelation of the vinyl chloride resin dispersed in the plasticizer by heating and the subsequent cooling. However, it is considered that the thermal strain generated in the tree-covered zone during the gelling and cooling significantly reduces the adhesive strength between the resin-coated layer and the coating film. The anchor filler incorporated in the blastisol acts to alleviate the thermal strain that occurs during gelation and cooling, which also results in release adhesives. It is considered to have contributed to the formation. Thirdly, compounds such as zinc oxide and magnesium oxide, such as Group II metal compounds of the periodic table, form a polymer radical when heated, and this polymer It is known that crosslinks are formed either by self-bonding to the molecular radical or by recombination of the polymer radical. However, it is considered that the vinyl chloride tea resin-coated tea targeted by the present invention also has the effect of improving the chemical adhesion by such crosslinking and the like. To

One problem that arises when resin-coated tea is formed from a vinyl chloride resin blastisol is the easy-open lid with such an m-band. When subjected to heat sterilization in the form of cans, the surface of the surface is likely to produce a plasticizer or other bleed-out, which causes the surface to be solid. This tends to cause adhesion of dirt, dirt, and the like, thereby deteriorating the appearance characteristics. This tendency is particularly remarkable when a tackifier is incorporated into the blastisol in order to enhance the adhesive strength of the resin-coated band to the coating film. According to the present invention, by adding a filler for anchors to blastizol, the tendency of stickiness to be suppressed even in the case of heat-sterilized cans is suppressed. However, it is possible to remarkably improve the stain resistance of the resin coating, and to make the appearance characteristics particularly good.

In addition, by blending the amino resin with the anchoring filler in the blastisol, it is possible to maintain an excellent level of stain resistance. In addition, it is possible to improve the adhesion to the coating film by one kagura.

According to the present invention, a can lid-resin-coated diaper engaging mechanism for preventing the resin coating 移動 from moving in the radial direction is provided inside the score for opening the can lid. This resulted in separation between the resin coating outside the opening score and the periphery of the can lid when opening, and the cut edge of the opening was covered with resin coating. Desired to be opened in the condition Shire

Observation of the easily-openable can lid of the present invention after opening reveals that most of the resin coating layer and the can lid are separated outside the engagement mechanism, and that the engagement mechanism does not. Since the close contact between the resin cover and the can lid is maintained on the inner side of the rim, the engagement mechanism is separate from the score portion that becomes a step when opening. It is understood that the resin coating is fixed to the can lid at the position, and has an action of clearly defining the adhesion area and the separation area of the resin coating so as to be clearly defined.

According to the present invention, by using a resin coating that satisfies the formulas (1), (2) and (3) at the same time, it is possible to prevent the resin coating band from breaking. While preventing this, it is possible to securely fix the covering band to the opening and to separate the covering band from the periphery of the can lid.

The above formula (1) relates to the balance between the ease of opening and the fixation of the coating. When the adhesive strength (A) exceeds 200 g g / cm, the coating Separation becomes difficult over the entire surface, and the influence on the opening force of the lid becomes so large that the lid becomes difficult to open or, in the worst case, cannot be opened. Also, if the adhesive strength (A) is less than 10 Scm, it becomes difficult to fix the coating band, and the resin coating may not cover the lid during handling, heat sterilization, or transportation. It will peel off and no longer provide protection.

The above equation (2) is related to preventing the rupture of the subject. If the coating strength (T) is 20 SZC D1 or less, the coating will break at the time of opening, and the cut edge of the lid opening will be cut. You can't cover it with the cover that protrudes outward.

Equation (3) is also affected. ! This is related to the separation of the tea can from the lid and the breaking of the covering, and if the above equation (3) is not satisfied, the covering is closed around the can lid when opening. They will not be separated from the part and will be broken, and the function of protecting the cut end will not be sufficiently fulfilled.

Further, according to the method of the present invention, the steps of forming the rivet (valve, valve) are performed by attaching and fixing the opening tab to the lid by bonding. The need for a form, button and steak) is eliminated, and the strictness of positioning of the opening tab is eased. It is possible to separate the step of fixing the tabs for application from the step of applying the organic resin coating between the step of engraving the score and the step of fixing the opening tabs. And are possible.

However, since the organic resin coated tea is applied prior to the fixing of the opening tab, a complete coating with a uniform thickness and width is provided over the entire circumference of the score. It can be formed.

Also, when the coating process is accelerated by the high-speed rotation of the lid and the lining gun, there are no tabs, so the shadows of the tabs may occur. In addition, the integrity of the coating is maintained and the tabs used during application There is no repelling, and there is no tab, so there is enough distance between the lining gun nozzle and the lid. This allows access and allows the formation of resin-coated zones within the intended pattern and dimensions. ..

Lid structure

In FIG. 1 showing the upper surface of the lid of the present invention, FIG. 2 showing its side cross section, and FIGS. 3A and 3B showing an enlarged cross section of the main part, this can lid 1 is shown in FIG. 3-A and 3-B As shown in the figure, it consists of a metal material 2 and an outer protective coating 3 a applied to the entire outer surface and an inner protective coating 3 b applied to the entire inner surface. 'Has a cross-sectional structure.

The lid 1 is provided with a peripheral rim part on an outer periphery and a panel part 6 connected via an annular rim part 5, and the lid part 4 has a can body flange (see FIG. In the case of double winding with a sealing member (not shown), a sealing component layer 7 is provided which is sealingly engaged therewith. Inside the annular rim portion 5 is a portion 9 to be opened, which is defined by a score 8. This opening portion 9 may substantially coincide with most of the panel portion 6, or a portion of the panel portion 6 may be the opening portion. The score 8 is provided so as to reach halfway in the thickness direction of the metal material 2 as shown in the enlarged sectional views of FIGS. 3-A and 3—B. The opening tab 9 is provided with an opening tab 10 in a mechanism described below. This opening The sealing tab 10 has a scoring tip 11 at one end, a gripping portion (ring) 12 at the other end, and is located between these and joined to the lid. It has a fulcrum part 13 to be used. In this specific example, the fulcrum portion 13 is a tab between the tip 11 and the ring 12, a cutout 14 having a substantially U-shaped shape, and the fulcrum portion 13. It is formed by forming a connecting portion 15 between the tip 11 and the tongue-shaped portion so as to exist. The tearing tip 11 of the opening tab 10 is positioned at the tongue-shaped fulcrum portion 13 so that the position of the tearing tab 11 substantially matches the score 8 of the lid. The lid is fixed by being thermally bonded to the opening portion 9 of the lid and, for example, via a thermoplastic resin adhesive layer 16.

On the outer surface side of the can lid 1, a cut end-protecting resin-covered band 17 made of an elastomer described in detail below is provided so as to straddle the score 8. ing . This resin coating 17 is provided over the entire circumference of the score 8, and is also better shown in Fig. 31B. It has a relatively small width on the outer side than 8 and a relatively wide width on the inner side of the score 8. In addition, it is understood that the resin coating .17 is also filled in the inside of the opening score 8, that is, in the groove.

In the can lid of this specific example, take the ring 12 of the opening tab 10 with a finger, and lift it up. Through the tip for tearing 1 1 The force is transmitted as a force, a downward tearing force is applied to the score 8, and shearing of the score 8 is started. Next, by lifting the opening tab 10 further upward, the opening portion 9 is also lifted upward, and the shearing of the score 8 further proceeds, and the opening portion is removed. Is performed. In Fig. 4 explaining the steps in the middle of this opening, a step is formed between the opening portion 9 and the outer peripheral portion 18 when the score 8 is sheared and opened. I understand

The resin coating 17 in the present invention is formed from a vinyl chloride resin-based blastisol containing an anchor filler, a tackifier, or an amino resin. For this reason, the adhesive is releasably adhered through the outer protective coating 3a of the lid. At the time of opening shown in Fig. 4, a tensile force acts on the resin-coated band 17 straddling the score 8, and this tensile force is generated at the position of the opening portion 9 by a shear stress and a shear force. That is, the outer peripheral portion 18 has a separating force. Generally, the adhesive structure is strong against shear stress but weak against pulling force. Thus, the resin coating band 17 is effectively fixed at the opening portion 9. However, in the portion 20 of the covering portion 1.7 projecting outward from the cutting edge 19 of the opening portion 9 of the covering 1.7, the separation proceeds with the outer peripheral portion 18 and the protruding portion. It will also be appreciated that 20 acts as a protector to prevent contact between the cut end 19 and the finger.

Also, a can lid provided inside the opening score 8 The first resin cover engaging mechanism, that is, the second score 22 or the rim 21 is engaged with the resin cover 17, and the cover 17 is pulled outward in the radial direction. It will be appreciated that it has the effect of blocking and securing movement.

Resin coating

According to the invention, the resin coating is applied to a blasting agent such as a vinyl chloride resin containing an anchor filler, a tackifier and / or an amino resin. And by gelation. A blastisol is a mixture of a vinyl chloride resin and a plasticizer, and is formed into a paste by heating. The sol is gelled by heating to obtain a uniform elastic body. Say.

In the present invention, as the vinyl chloride tea resin, in addition to the vinyl chloride vinyl chloride polymer, vinyl chloride and a small amount of copolymer, for example, vinyl acetate, vinylidene chloride, Copolymers with styrene, acrylate ester, methacrylate ester, and butadiene can also be used. The average degree of polymerization of these vinyl chloride-based resins is not particularly limited, and generally from 500 to 300. These vinyl chloride resins may be those having a relatively fine particle size by an emulsion polymerization method, those having a relatively large particle size by a suspension polymerization method, or those having a relatively large particle size by a suspension polymerization method. These mixtures can also be used for the purpose of the present invention.

As the plasticizer, a plasticizer generally used for chlorinated bull tea resin, for example, the following plasticizers can be used. Can be

1. Ethyl phthalate

Diethyl phthalate

Phthalic acid di-n-butyl

Di-phthalic acid-i-butyl

Phthalic acid Dihexyl

Butyl phthalate

Phthalic acid dilute cutle (D0P)

[Includes n-octyl, 2-ethyl-hexyl and iso-octyl]

Di-ethyl phthalate Butyl-I-Nonyl phthalate di-n-octyl-n-decyl Didecyl phthalate

[n — deciles, including i-deciles. ]

Dibutyl benzyl phthalate

Phthalic acid diphenyl

Diethyl phthalate Mouth to mouth

Dimethylcyclohexyl phthalate

Dimethyl phthalate

Dibutoxy phthalate

Ethyl phthalyl acetyl glycolate-Butyl phthalyl butyl glycolate

2-aliphatic dibasic acid ester

Adivinic acid di i-butyl- Acetyl octyl acid

[2—Ethyl hexyl, n—Aged octyl] Didecyl adibinate

[i-decyl, n-decyl]

Adivinic acid di (n-octyl-n-decyl) adivinic acid dibenzyl

Dibutyl sebacate

[n—butyl]

Dioctyl Senotinate

[2-ethylhexyl, n-octyl] azellanic acid -n-hexyl

Dioctyl azelaic acid

[Gisil to 2 ethyls]

Phosphoric acid ester

Diphenyl phosphate diethyl to ethyl

Hydroxy polyvalent carboxylate ester tartaric acid

Triethyl acetyl citrate

Tributyl acetyl citrate

Acetyl citrate to 2-ethyl

Monosodium citrate

Tributyl citrate

Mono-, di-, and tri-steryl acids

Fatty acid ester Acetyl ricinoleic acid methyl ester

Palmitic acid ethyl

Stealine acid ethyl

Stearate n-butyl

Stearic acid ammonium

Cyclohexyl stearate

Butyl oleate

Hydrogenated rosin methyl ester

Polyvalent alcohol ester

Glycerin reset acetate

Glycelain trib mouth

Glycerin tributylate

To glycerin storage Butanoate

Glycerin monomethyl monosteary Glycerin monomethyl monolaureate ethylene glycol Late tri-ethylene glycol carboxylate pentadioldiol disobutyrate ester Epoxy plasticizer

Epoxy soybean oil

Epoxy Dashi Castor Oil

Epoxy

Epoxylated flower oil

Epoxylated oil Epoxy stearate acid cuticle

[Both i-octyl and 2-ethyl-hexyl]

3-(2-xenokishi) 1-1, 2 epoxy propane 8. Polyester tea plasticizer

Poly (diethylene glycol, terpene maleic anhydride adduct)

Polyester (propylene glycol, adivic acid)

Poly (1,3-butanediol, adivic acid) ester

Poly (propylene glycol, senotinic acid) ester

Poly (1,3-butane-agesebacic acid) ester

Poly (propylene glycol, phthalic acid) ester

Poly (1,3-butanediol, phthalic acid) ester

Poly (ethylene glycol, adipic acid) ester

Poly (1,6-hexandiol, adipic acid) ester

Aceru Rui Dani Poli (butanediol, adibic acid) ester [1, 3-and 1.4-types for butanediol] 9.

A Le key Angeles Le Ho phosphate (C i ₂ ~ C ₂₀₎

Hue No Rues Tell

A Le Kill sulfo phosphate (c ₁₂ ~ c ₂₀₎

Cresol Estel

Hydrogenated polybutene

P-tert-butylphenyl salicylate

Chlorinated paraffin.

The anchor filler used in the present invention is as described above between the resin coating formed from the blastisol and the coating surface on which the blastisol is applied. It shows the adhesive force due to the anchor effect and the like, and in this sense, it is different from ordinary fillers.

Suitable examples of this anchoring filler include, but are not limited to, oxides, hydroxides or carbonates of Group II metals of the Periodic Table. For example, zinc oxide, magnesium oxide, magnesium hydroxide, calcium carbonate, magnesium carbonate, basic magnesium carbonate, etc. . Among these, heavy calcium carbonate, zinc oxide, and magnesium oxide are particularly suitable. These π-group metal compounds of the periodic table have a particularly large effect of improving the adhesive force between the resin coating and the coating film as compared with other fillers, and have excellent resistance to resin coating. Those that also contaminate It is. It also has the advantage of being white.

The particle size of the anchor filler used is not particularly limited, but generally has a particle size of 0.01 to 20 μπι, particularly 0.053 to 15 μπι. Is desired.

In a preferred embodiment of the present invention, heavy calcium carbonate and zinc oxide are used in combination. In this combination, the highest adhesive strength is obtained between the resin-coated band and the coating film, and the effect of improving the stain resistance is high. The combination ratio of both can be varied in various ways, but the weight ratio of heavy calcium carbonate to zinc oxide is 1: 0.01 to 1:10, especially 1: 0.1 to 1: 5. It is better to use it in

'In the present invention, by blending an amino resin with a blastisol together with an anchor filler, a level of excellent contamination resistance is achieved. It was found that, while maintaining, it was possible to improve the adhesion to the coating film after retort sterilization.

Examples of the tackifier to be added to the blast sol composition of the present invention include vinyl aromatic hydrocarbon resins, terbene resins, rosins, coumarone resins, and petroleum resins. Known tackifiers such as hydrocarbon resins and phenol resins can be mentioned.

As a vinyl aromatic hydrocarbon tea resin, for example, the formula

In the formula, each of R ₂ and R ₂ is a hydrogen atom or an alkyl group having 4 or less carbon atoms (hereinafter referred to as lower), R ₃ is an alkyl group having 4 or less carbon atoms, and n is An integer up to 2 including zero,

And the copolymers of these monomers and other ethylenically unsaturated monomers can be mentioned. Appropriate examples include, but are not limited to, the following: '

Polystyrene, Poly (methyl styrene), Poly (vinyl nitrene), Poly (methyl styrene), Poly (isobenzyl) styrene , Α-methylstyrene-vinyl toluene copolymer, styrene-ethyl acrylate copolymer, styrene-methyl acrylate Methyl acrylate copolymer, styrene-butadiene copolymer.

Examples of terbene tea polymers include, for example, dibenten polymer, α-vinyl polymer, 3—vinyl polymer, isobrene polymer, or a combination thereof. Can be mentioned. In addition, the terbene tea polymer may be modified with phenol and organic acids. In addition to rosin, rosin esters, ester gams, hydrogenated rosins, rosin benzene elistri esters Various resin modified products of rosin and the like are used.

As petroleum resins, petroleum-based unsaturated hydrocarbons were used as raw materials; various resins, for example, resins mainly using cyclobenzene, and high-grade refined resins. Resins using hydrocarbons as a main raw material are mentioned.

In addition, as a coumarone-indene resin, a relatively indian resin obtained by polymerizing coumarone and indene in the presence of a sulfuric acid or a freeride craft catalyst is used. Low molecular weight ones are used.

In the production of a blast sol composition of the type used in the present invention, a tackifier is dissolved or dispersed in a plasticizer at a high temperature, followed by After cooling this, it is better to disperse the vinyl chloride resin.

Examples of the amino resin include urea, melamin, acetoguanamine, benzoguanamine, and other amino-containing compounds and formaldehyde. The resin obtained by condensing is used, and it is used in methanol, ethanol, n-butanol, iso-butanol, etc. The etherified amino resin that has been etherified is preferably used. These amino resins are commercially available in the form of a solution dissolved in a solvent such as methanol, butanol, or xylol. Liquid is added to the blast sol to form a resin-coated band Review

The amino resin has a basic concentration of 0.8 to 3.0 gram atoms, particularly Q.3 to 2.5 gram atoms, corresponding to 100 gram of the resin. Those having a concentration of tylol group and ethereal methylol group in the range of 50 to 500 millimol, particularly in the range of 60 to 400 millimol,好 It is also advantageous in terms of releasable adhesion.

The fact that release adhesion can be achieved by the addition of amino resin to the butyl chloride resin blastisol has also been found as a phenomenon, and the reason is still sufficient. Although the present invention has not been described, the present inventors presume as follows. That is, the amino resin has a functional group such as a methylol group or an etherified methylol group and a functional group such as an amino group serving as a skeleton in its molecular chain. It has both. In addition, the formation of a resin-coated band with a blastisol is performed through gelation by heating a vinyl chloride resin dispersed in a plasticizer and subsequent cooling, but It is recognized that, during the heating for the gelation, a releasable adhesion is generated due to the chemical interaction between the functional group in the amino resin and the film-forming resin.

One problem that arises when forming a resin coating from a vinyl chloride resin blast sol is that the easy-opening lid that uses the coating can be heated in a canned form. When exposed to sterilization, the surface of the surface is likely to produce a blowout such as a plasticizer. Due to this, the tendency of the coating and the surface to become sticky causes adhesion of dirt, dirt, and the like, and the appearance characteristics are reduced. This tendency is particularly remarkable when a tackifier is incorporated into the blastisol to enhance the adhesion of the resin-coated tea to the coating film. In contrast, the amino resin used in the present invention has an exception in that when it is blended with a blastol of vinyl chloride resin, the stickiness tends to be higher than that of other resins. It is particularly small, and can significantly improve the stain resistance of the resin coating and improve its appearance characteristics.

Furthermore, by forming the resin coating from a salted vinyl tea resin blastisol blended with an amino resin, the outer surface of the lid is clear (transparent). A) A resin coating is formed, and the advantage of not impairing the commercial value of the outer surface of the can is also achieved.

These amino resins have a less tendency to stick to the resin coating after heat sterilization than the tackifier, and a resin coating excellent in stain resistance has a releasable adhesive state. It has the advantage of being formed by.

In the present invention, the plasticizer is used in an amount of 35 to 200 parts by weight, particularly 60 to 160 parts by weight per 100 parts by weight of vinyl chloride tea resin. If the amount is less than the above range, the fluidity required for application cannot be obtained, and the flexibility or cushioning property required for protection cannot be obtained. On the other hand, when the amount is larger than the above range, the covered resin composition becomes excessively flexible and the mechanical strength is too low, so that the present invention It is not suitable for the purpose. -On the other hand, the filler for anchors is used in an amount of 1 to 90 parts by weight, especially 5 to 70 parts by weight, per 100 parts by weight of the vinyl chloride resin, and in the final brush. It is better to use it within the range where the fluidity of thisol is maintained. That is, if the amount of the filler for anchor is less than the above range, the effect of enhancing the adhesive strength and the improvement of the stain resistance is small, and if it is more than the above range, the resin coating is brittle. There is a tendency.

The amount of the tackifier can be varied in various ways depending on the required degree of adhesion. Generally, the tackifier is used in an amount of 5 to 10 parts by weight per vinyl chloride resin. It is advisable to add 150 parts by weight, especially 10 to 100 parts by weight. When the amount of the tackifier is smaller than the above range, it is generally difficult to improve the adhesive strength to 10 s / cm or more, while when the amount is larger than the above range, the adhesive strength is increased. If the force is too high, it may be difficult to smoothly exfoliate, or the coated tea may be more sticky.

Further, the amount of the amino resin is preferably 1 to 30 parts by weight, more preferably 2 to 20 parts by weight, per 100 parts by weight of the vinyl chloride resin, and is preferably combined. Amino resin content is within the above range When the amount is too low, the hot water is not sufficient to maintain a detachable adhesive state even after retort sterilization, and if the amount is larger than the above range, the sol will not be formed. It becomes stable or has a tendency to thicken.

The vinyl chloride-based resin composition for forming S 带 used in the present invention includes, as optional components, stabilizers, other fillers, cosmetics, foaming agents, and the like, which are known per se. The S mixture can be formulated according to a known formulation. For example, stabilizers include metal experiment stabilizers, organic stabilizers, and organic phosphoric acid ester tea stabilizers, and pigments such as titanium white and carbohydrate. Foaming agents such as azocarbon amide, 4,4-oxobis (benzensulfonyl) hydrazide, etc. Is used.

The formulation of a suitable blast sol composition is shown below. Opaque formula

Vinyl chloride resin 100-fold heavy S part Plasticizer 60-160)} Blowing agent 0-2 Nozo stabilizer 0.5-4 Kuno activator 1-5 Non-anchoring filler 5- 7 0)} Cosmetics 0 to 5 Nonoclear prescription

100 parts by weight of vinyl chloride resin Plasticizer 60-: 160 〃 Blowing agent 0-2 "Stabilizer Q.5-4 g Active agent 1-5 g Transparent filler 1-10

Tackifier or Amino Resin 2 to 100 "The material forming the can lid may be a surface treated steel plate or an aluminum plate, but the present invention has a high rigidity. It is especially useful for easy-open can lids made of surface-treated steel linings where sharp cutting edges are easily formed.The surface-treated steel linings are electrolytic chromic acid-treated steel linings (TFS) , 鍚綱綱：（キ（（（（プ（プ（（（（（プ（（（ププププ（（プHowever, the present invention is not limited to these examples, and it is preferable that the metal material has a thickness of generally 0.10 to 0.4 Qmin, particularly Q.12 to Q.35 mm. No.

As the protective coating, any protective coating known per se, which exhibits excellent adhesion to the above-described metal materials, is used. The paint may be a thermosetting or thermoplastic resin paint, for example, a vinyl epoxy paint, an amino ♦ epoxy paint, an epoxy ♦ ester Modified epoxy paints, such as vinyl chloride-vinyl acetate copolymers, partially saponified vinyl chloride-vinyl acetate copolymers, Vinyl chloride-vinyl acetate-maleic anhydride copolymer, epoxy modified-epoxy amino modified or epoxy phenol modified-vinyl resin paint Vinyl or modified vinyl paint; acrylic resin paint; oil paint; alkyl paint; polyester paint; styrene-butadiene copolymer Synthetic rubber tea paints and the like are used.

The protective coating may be the first coating, or a combination of the undercoat (undercoat) and the topcoat (topcoat). Also, a printing layer made of printing ink may be provided on the undercoat film, and a finishing varnish layer may be provided on the printing layer.

In the present invention, at least a portion of the organic resin coating film on which the protective resin coating band is to be provided, which is non-adhesive to the vinyl chloride resin, must be used. No. Otherwise, the releasable adhesive described in the present invention cannot be formed between the protective resin-coated band and the band. As the non-adhesive outer coating for such a vinyl chloride resin, an alkyd aluminum coating, an oil-free alkyd coating, an amide coating, Polymer saturated polyester ♦ Polyester certain paint such as amino paint; Epoxy ester paint; Epoxy ♦ Amino paint. Poxy-phenolic paints can be mentioned.

Most preferably, the coating applied directly above the metal material is an epoxy paint. In short, epoxy paints This is because it has excellent adhesion to metal substrates and workability, as well as excellent separation and adhesion to resin coatings. This is because it can also be an excellent adhesive primer for sintering. Epoxy tea paints include an epoxy resin component and a curing agent resin component exhibiting a curing action of the epoxy resin component, for example, a phenol-form aldehyde resin, an amino resin. Combinations of at least one species are preferred, and most preferred are resole-type phenols derived from various phenols and formaldehyde. It is a phenolic epoxy paint composed of a phenolic epoxy resin and a phenolic epoxy resin, especially a phenolic resin and an epoxy resin. It is a coating composition containing 90% by weight of xyline resin and 5:95. This paint is also excellent in processability, and has the advantage that, even when subjected to scoring, the scoring portion has good corrosion resistance. . This type of paint also has excellent adhesion to the polyamide adhesive used for tab fixing.

The thickness of the coating film is not particularly limited as long as the above-mentioned purpose is achieved, but generally speaking, Q.2 to 30 m, especially 1 to 20 / m should be in the range o

Opening score 8 The remaining thickness at the score is 1 to 8 to 1/2 of the raw plate thickness and the absolute thickness is 0.2 to 0.2. It is desired to be in the range of 0.3 mm, especially Q.3 to 0.8 mm. To apply the resin coating to the lid on which the opening score is formed, apply the above-mentioned blastisol and gel the blastisol after application. Method is adopted. For the application, a method of lining a blastisol while rotating a lid or a lining nozzle is employed. It is preferable to perform the heating at a temperature of 160 to 280 for 10 seconds to 4 minutes. To ensure lining, it is desirable that the viscosity of the coating solution be less than 400 cps. The average thickness of the resin coating is, on average, in the width direction, generally 0.005 to Q.5 im, particularly 0.01 to Q.3 (3nim, and in view of the protection effect. It is desirable that the protruding dimension from the score 8 to the outside is in the range of Q.005 to 3 mm, especially 0.01 to 2 mm. Should satisfy the above expressions (1), (2) and (3), and more preferably, the expression 150 0 g / cni>A> 30 g / ci- (1 ′ ) T> 50 g / cm (2 ')

2 1 0 0

T> ― (Α — C) + (3 ')

It is better to satisfy 33. The opening tab is the same or different from the material that makes up the can lid. It may be formed from seed materials. For example, it may be formed from a light metal plate, such as aluminum or an aluminum alloy, or may be formed from a surface-treated steel plate. Is also good. Further, as long as it has sufficient rigidity, it may be formed from a plastic material.

When the opening tab is fixed with a thermoplastic adhesive, a resin containing an amide repeating unit and a resin having a repeating unit of amino or ester is preferred, and has a melting point or softening point of 50 to 300, and In particular, homo-to-coboriamide, copolyester or a mixture of two or more of these, which are in the range of 80 to 270, are used. . '-In the specific example shown in the drawing, the opening tab is fixed to the can lid by bonding, but it is natural that the tab can be fixed mechanically by conventional riveting. is there .

Note that the second score, which can be engaged with the can lid-resin coating, should have such dimensions that the resin can be filled and the two can be engaged with each other. The opening width of the score is 0.03 mm or more, preferably O.Q5mni or more, more preferably 0.07πιπι or more, and the score angle of the score is 150 ° or less. In particular, it is desired to be in the range of 135 degrees or less. Also, the step size of the rim portion or the step portion serving as the engagement mechanism is desirably in the range of 0.10 to 1.ΟΟαιιπ, particularly 0.15 to Q.60 mm. The angle between 20 and 90 degrees, especially Preferably between 30 and 85 degrees.

Manufacture of lid

In FIG. 5, which shows the upper surface of the lid obtained in the first step, FIG. 6, which shows a side cross section thereof, and FIG. 7, which shows an enlarged cross section of the main part, this can lid 1 is shown in FIG. As shown in the figure, it has a cross-sectional structure consisting of a metal material 2, an outer protective coating 3a applied to the entire outer surface thereof, and an inner protective coating 3b applied to the entire inner surface thereof. Yes.

The lid 1 has a circumferential groove 4 on the outer periphery and a panel 6 connected to the groove via an annular rim (chuck wall) 5 in the groove. The part 4 has a sealing compound layer 7 which is sealingly engaged with the can body flange (not shown) when the double winding is performed. It is provided. Inside the linear rim portion 5, there is a portion 9 to be opened, which is defined by a score 8. The opening portion 9 may substantially coincide with most of the panel portion 6, or the-portion of the panel portion 6 may be the opening portion. The score 8 is provided so as to reach halfway in the thickness direction of the metal material 2 as shown in the enlarged sectional view of FIG. Although the score 8 is torn at the time of opening, in order to reduce the residual thickness of the score 8, the inside of the opening score 8 and the outside or outside of the score 8 are cut. A second score 10 may be provided.

In the specific example shown in the drawing, a second score 22 and a varnish are further provided inside the score 8 that defines the opening portion 9. 3 3

The core is also provided with a rim portion or a step portion 21 on the inside at small intervals.

The molding and scoring of the lid shown in FIGS. 5 to 7 can be performed by using a known can lid molding apparatus. In addition, the formation of the sealing compound layer 7 is achieved by applying the aqueous latex or solution of the sealing compound via a lining nozzle. Then, it is applied to the groove of the lid under rotation and dried. The application step of the sealing compound may be performed at any time, such as between the first step and the second step, between the second step and the third step, or after the third step. It should be understood that what can be done in stages.

In FIG. 8 showing the upper surface of the lid obtained in the second step, FIG. 9 showing the side cross section thereof, and FIG. 10 showing the cross section of the main part, the outer surface of the can lid 1 has Further, a scoring cut end protecting resin coating 17 made of an elastomer is provided so as to straddle the scoring 8. This resin-coated body 12 is provided around the entire circumference of the score 8, and as shown in FIG. 10, as shown in FIG. A relatively small width is provided on the outside, and a relatively large width is provided on the inside of the score 8 so as to completely cover the varnish core 22 and the rim portion 21. Has been done. In addition, the resin cover 17 is filled in the inside of the opening score 8 and is in close contact with both sides thereof, so that the opening score 8 is protected from corrosion and corrosion. It will be understood that they also have the function of a coating for use. The same is true for the second score 22.

The application of the protective resin coating shown in FIGS. 8 to 10 is performed by the means described previously.

In Fig. 1, Fig. 2 and Fig. 3-A and 3-B showing the upper surface of the lid obtained in the third step, the tip 1 1 for tearing the opening tab 10 is shown. At the tongue-shaped fulcrum portion 13, the opening portion 9 of the lid and the thermoplastic resin adhesive are placed so that the score 8 of the lid and the position thereof almost coincide with each other. Secure by heat bonding through layer 16.

The lid shown in FIGS. 1 and 2 is provided under the condition that the adhesive layer 16 positioned between the lid 1 and the fulcrum portion 13 of the opening tab 10 is in a molten state. Then, the adhesive layer 16 is cooled and solidified under pressure. In this step, the adhesive layer 16 is heated and melted within a very short time by high-frequency induction heating of the corresponding portion of the lid, while the power is cut. As a result, the adhesive is cooled and solidified within a relatively short period of time due to the heat transfer and heat dissipation.

(Example)

Example 1 to Example 3

Epoxy phenol-based paint on both sides of 0.20 αι ιη normal tinfour steel (TFS) plate, the thickness after baking becomes 5 m And bake for 10 minutes with 210 Was performed. The coated TFS plate was formed into a 211-diameter lid using a brush, and then the sealing compound was applied to the curled portion by a conventional method and dried. Next, a scoring for opening was placed on the outer surface of the lid so that the remaining scoring thickness of the mesh plate was 0.23, and it was concentric with this scoring and had a diameter of 54 miii. A second scoring with a square opening width of 0 and 10 mm and a taper taper angle of 130 degrees was formed.

Using a nozzle lining device at both scoring portions of the lid material obtained in this way, the rotary lining method was used to obtain Examples 1 to 3 shown in Table 1. After the vinyl chloride sol of Example 3 was applied, the coating was heated at 200 for 2 minutes to provide a protective resin: coating. The thickness of the resin coating obtained in this way is 0.02 mni, the projected dimension outside the opening score is l mm, and the opening score and the varnish Both cores were covered with resin without defects. Next, a tab for opening made from a 0.35 mm thick painted TFS plate was used. The distance from the score to the adhesive fulcrum was 6 mm, and the width of the adhesive layer at the adhesive fulcrum. The film was adhered at 220 with a Nylon 12-based film-like adhesive so that the thickness became 5 mm. Finally, the inside of the lid was spray-coated with epoxy vinyl tea paint and baked at 190 t for 4 minutes.

The easy-opening lid obtained in this way is double-tightened to a 211-diameter flange can body, and then filled with dressing tuna as the contents. After tightening the flat lid, 1 16 t 90 min The retort processing was performed. After this retorting treatment, the state of the protective resin coating when the easy-opening lid was opened and the contamination state of the protective resin coating band were evaluated. The results are shown in Table 1.

Comparative Examples 1-2

Using a nozzle-lined device at the scoring portion of the lid member having the opening score and the second score similar to those of the first to third embodiments, a rotary linen is used. After coating the burbrasoltisol of Comparative Example 1 and Comparative Example 2 shown in Table 1 with the coating method, heating was performed at 200 for 2 minutes to form a protective resin coating. did. This resin coating 带 has the same shape as those of Examples 1 to 3.

Tabs were adhered and the inner surface of the lid was corrected in the same manner as in Examples 1 to 3, whereby the easy-opening lids of Comparative Examples 1 and 2 were prepared. Finally, using these easy-open lids as in Examples 1 to 3, the 2 11-diameter flange can body was double-tightened, and the contents were dressed. After filling with the horn tuna and tightening the flat lid, a retorting treatment was performed for 90 minutes at 116. After the retort treatment, the state of the protective resin coating when the easy-opening lid was opened and the contamination state of the protective resin coating 带 were evaluated. The results are shown in Table 1.

According to this result, in the easy-open lids of the present invention of Examples 1 to 3, an epoxy resin-based organic resin coating film is provided on the outer surface side of the lid. , Protective resin coating It is formed from a specific polyvinyl chloride resin blastol containing a filler for anchoring. Each of these easily openable lids has an adhesive strength at the interface that can withstand retorting or various types of node ring, and also causes cohesive failure of resin. The force is higher than the adhesive strength, and the adhesive strength is lower than the opening force of the finger. Further, in the lid of the present invention, the breaking (separation) of the adhesive due to the opening force occurs only outside the opening score, and the adhesion is maintained in other portions. In addition, it has a feature that the covering band is connected to the opening side. That is, since the cut edge of the opening is covered with the resin coating at the time of opening, there is no injury to the hand, and an effect that the opening can be performed safely is provided. Even if the resin coating is provided, the opening can be performed with a low force without affecting the opening force. In addition, an easy-opening lid that is excellent in the protection of the score portion is also provided. Further, in the first to third embodiments, one of the effects is that the protective resin coating is always kept clean and free of dirt.

On the other hand, Comparative Examples 1 and 2 are examples in which the amount of the anchor filler is outside the scope of the present invention. In Comparative Example 1, since the amount of the filler for the anchor was large, the viscosity of the PVC blastisol was high, which caused difficulties in nozzle lining and at the same time the gel Even after the formation, the resin coating band was brittle, and due to the force at the time of opening, the coating 带 partially broke along the opening score and opened. Since the cut edge of the mouth is exposed, there is a great risk of injury to the fingers. Comparative Example 2 is an example in which the anchor filler exceeds the lower limit of the present invention. In this case, the anchoring effect of the filler cannot be achieved, and the resin-coated band is already removed from the lid before applying the opening force with the finger by the retorting process. They are far apart. Since the cut edge of the opening is exposed as in Comparative Example 1, there is a great risk of injury to the fingertip. Also, in this example, rust, dirt, and the like adhere to the resin-coated layer, and the appearance characteristics are remarkably inferior.

Composition evaluation of Biblastizol Evaluation results力脂-状態 m m m m m m m m m m m m 状態状態 m 状態状態状態状態状態状態Example 1 Homopolymer ^u ES070 part 20 Part 20 Occurs only on the outer side, and the exposed part is opened.

The part 100 remains connected to the part. Emulsion polymerization Navigated ATBC 50 parts Heavy ^ titanium oxide

Example 2 Homopolymer ^u ES0 70 parts Calcium 15 parts 间 top 问 top

100 parts 60 parts Emulsion polymerization ATBC 500 parts Magnesium oxide

Real 3 Homopolymer ¹ > £ S0 70 part

100 parts 2 5 parts Emulsified S-containing ifi-bi ATBC 50 parts Oxidized zinc Resin coated

From the part "ES0700 part 100", the target partly breaks and the upper part

100 parts. Emulsion polymerization ATIiC 50 parts Heavy carbonated titanium Attached to grease, dirt, dirt, etc. by retort treatment, ratio 2 Homopolymer ^1> ES0 70 parts Calcium 15 parts separation Is already inferior in all areas.

100 copies 3 copies are produced.

1) Average ffi degree A'FBC: Tributyl acetyl citrate

1500 t'SO: Epoxy-style mountain

Example 4 and Example 5

An epoxy-phenol paint is applied to both sides of a normal tin-free steel (TFS) plate with a plate thickness of 0.20 mm so that the thickness after baking becomes 5 μm. Then, baking was performed at 210: for 10 minutes. Next, besides the part that will become the tab adhesive part, the indication of the opening method is painted twice with white ink after painting the white ink twice, and finally the Alkaline Amino paint The resulting over-blanched varnish (OP varnish) was applied to the area where the tabs would be bonded, and then baked at 15 for 10 minutes. This coating and printing plate was formed into a 211-diameter lid using a brush so that the printing surface would be the outer surface. Next, a scoring opening was formed on the outer surface of the lid so that the scoring residual thickness / steel board speed was 0.23. Using a nozzle lining device on the scoring part of the lid material obtained in this way, the rotary lining method was used to obtain Example 4 shown in Table 2. After applying the vinyl chloride resin-based blastisol of Example 5 and heating at 200 ° C. for 2 minutes, a protective resin coating was formed. The resin coating is provided so as to straddle the opening score across both sides of the score. Next, an opening tab made from a 0.50fflm-thick painted aluminum plate is placed on the adhesive fulcrum at a distance of 6 mm from the score to the adhesive fulcrum. Bonding was performed at 220 using a Nylon 12-based film adhesive so that the width of the adhesive layer was 5 IQ1I1. Next, spray the inside of the lid with epoxy-phenol paint. Then, it was baked at 190 t: for 4 minutes. Finally, a sealing compound was applied to the curl part by a standard method and dried.

The easy-opening lid obtained in this way is double-sealed with a 211-diameter flanged can body, and then filled with a drain and a signal tuna as the contents. However, after tightening the flat lid, retorting was performed for 90 minutes on 116. After the retorting treatment, the state of the protective resin coating and the contamination of the protective resin coating band when the easy-opening lid of Examples 4 and 5 were opened were evaluated. The results are shown in Table 2.

* In the easy-opening lid of the invention, a 0P varnish is provided on the outer surface side of the lid, and the protective resin coating contains a filler for anchor and an amino resin. It is formed from a specific blastisol of vinyl resin. Since Blastizol from Toshiki contains anchor filler and / or amino resin, it should be installed on a different coating surface than in Examples 1 to 3. Even if a peelable bond can be formed as well. Therefore, at the time of opening, since the cut edge of the opening is covered with the resin coating, there is no injury to the hand, and the effect of opening safely can be obtained. In addition, an easy-opening lid having excellent scoring protection at the score portion and further having a protective resin-coated diaper free from dirt and constantly maintained in a clean state is provided. Composition of vinyl chloride plastizol ^ Valuation results Carburized plastic filler Plasticizer Anchor Grease coating 帯 belt state at opening Resin coating 带 band Emulsion polymerization ^ Biological ATBC 60 parts黢of zinc butyrate ¾ fat the 81 bands剁tt is about Rosukoa I unstained clean coating带happened only outside Ri resulting et homopolymer ^1> 10 parts fluororesin, the are open.

Example 4 15 parts of 80SB heavy carbon

重合 »Polymerization i Bi ES0 60 parts Calcium

Homopolymer ² > 40 parts 15 parts

20 parts Emulsion polymerization recommended 60 parts S H

Example 5 Homopolymer ⁿ calcium resin ·>

100 parts ES0 60 parts βο part 10 parts

1) Average strength ATBC: Tributyl acetylquenate a) Xylol and butanol

1500 ES0: Epoxy bfcg oil solvent (60% of total)

2) Balance

1000

Example 6

An epoxy-phenolic brown paint is applied to both sides of a normal tin fried steel (TFS) plate with a plate thickness of 0.20 niffl so that the thickness after baking becomes 5 μm. And baking at 210 for 10 minutes. This painted TFS 扳 is molded into a 211-diameter lid using a brush, and then a sealing compound is applied to the curl in a conventional manner. Dried. Next, an opening score was formed on the outer surface of the lid so that the remaining score / mesh thickness was Q · 23. The scoring part of the lid material thus obtained was rotated by a rotary lining method using a nozzle lining apparatus on the scoring part of Example 6. After applying the vinyl blastol, it was heated at 200 X: for 2 minutes to provide a protective resin coating. This resin coating is provided so as to straddle over both sides of the scoring opening. Next, a tab for opening made from a painted TFS plate with a thickness of Q.35 mm was used. The distance from the score to the adhesive fulcrum was 6 min and the width of the adhesive layer at the adhesive fulcrum. Was adhered with 220 using a Nylon 12 series film-like adhesive so that the thickness became 5 mm. Finally, the inside of the lid was spray-coated with epoxy phenolic paint and baked at 190 * C for 4 minutes.

The easy-opening lid obtained in this way is double-tightened to a 211-diameter flange can body, and then filled with dressing tuna as the contents. After tightening the flat lid, The retorting process was performed for minutes. After this retorting treatment, the separation state of the protective resin coating when opening the easy-opening lid was evaluated. The results are shown in Table 3.

Comparative Examples 3 and 4

A nozzle lining device was used for the scoring part of the lid material having the same opening score as in Example 6 and the rotation lining method was used to obtain the results shown in Table 3. After applying the vinyl chloride blastisols of Comparative Example 3 and Comparative Example 4 shown in the drawing, the coating was heated at 200 ° C. for 2 minutes to form a protective resin coating. These resin coatings are provided so as to straddle both sides of the opening scoring surface. In the same manner as in Example 6, the easy-opening lids of Comparative Example 3 and Comparative Example 4 were prepared without tab adhesion and correction of the inner surface of the lid. Finally, using these easy-open lids as in Example 6, double-tighten the 211-diameter flanged can 膶 and then replace the dressing as the contents. After filling with the horn tuna, and tightening the flat lid, a retort treatment was performed for 11.6t for 90 minutes. The detached state of the protective resin coating when opening the easy-opening lid subjected to this retort treatment was evaluated. The results are shown in Table 3 .

According to this result, in the easy-opening lid of the wood invention of Example 6, the organic resin coating film of epoxy-phenol tea was provided on the outer surface side of the lid, and protection was achieved. The resin coating is formed from a specific butyl chloride-based resin blastol containing an tackifier. With this easy-opening lid, it is reasonable Or adhesive strength at the interface that can withstand various types of handling, and the cohesive failure of the resin is greater than this adhesive strength. Is smaller than the opening force of the finger. Further, in the lid of the present invention, the destruction (separation) of the adhesive due to the opening force occurs only outside the opening score, and the adhesive is maintained at other portions. In addition, it has a feature that the covering band is connected to the opening side. That is, at the time of opening, the cut end of the opening is covered with the resin-coated band, so that there is no injury to the hand and an effect that the opening can be performed safely is given. In addition, an easy-opening lid that is excellent in the protection of the score portion is provided. · — Comparative Examples 3 and 4 are examples in which the amount of the tackifier is out of the range of the present invention. In Comparative Example 3, since the amount of the tackifier was small, the resin-coated band was already separated from the lid even if the opening by the finger was not applied by retorting. In this case, since the cut end of the opening is exposed, there is a great risk of injury to the hand. On the contrary, Comparative Example 4 is an example when the amount of the tackifier exceeds the upper limit of the present invention. In this case, the gelation of the blastisol is insufficient, and the cohesive breaking force of the resin coating 带 is insufficient. Therefore, at the time of opening, the adhesive strength of the resin-coated band with the lid exceeds this cohesive and destructive force, and the resin-coated band is cut without separating. At this time, since the resin coating is flush with the cut end green of the can lid, it is not enough to prevent direct contact between the cut edge and the finger. And the protection effect is not yet sufficient

Composition of the plastics

State of tfi grease band at opening ffi-filled fine g plasticizer Adhesive agent emulsification H-group ATBC 60 parts water rosin pentae «Grease cover 帯 band outside the opening score only> Example 6: Homopolymer ¹ > ESO 60 parts Lisli 1 "" * 1 * ester

100 parts 70 parts Emulsified composites ATBC 40 parts Fatty acid by pentae retort treatment of rosin ffl (Niwa Niwa ratio example 3 homopolymer ¹ ) ESO 20 parts Lisuri 1 ^ Esters have already occurred.

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Prior to the description of Examples 7 and 8 and Comparative Examples 5 to 7, the methods for evaluating the physical properties of the resin coating and the method for evaluating the opening property will be briefly described below.

[Evaluation of openness]

After the test lid is double-tightened to the brown flange body, the contents are filled with dressing tuna, and the flat lid is tightened. The evaluation was performed on the case where the retort processing was performed for 90 minutes in.

The evaluation was performed for the following items.

(a) Opening force (easiness of opening the lid based on the lid of Comparative Example 5)

l b) Opening safety (hand injury when opening)

(c) Corrosion resistance of the score (visual observation of the score)

The score is indicated by X X m.

[Evaluation of physical properties of resin coated band]

Physical properties were evaluated on the can lid before opening of the same lot where the opening property was evaluated.

1. Adhesive strength

One end of a resin-coated tea coated or formed on the can lid or resin-coated tea lined with a reinforcing film, separated from the painted plate and placed between this end and the painted plate An 80 t peel tensile test was performed. For the tensile test, an Instron type tensile tester was used, and the tensile speed was 100,000. The measurement was performed at room temperature in mm / min. Five measurements were performed for each sample, and the arithmetic mean value was converted to an lcm width to determine adhesion (g / cm).

2. Strength

A resin-coated band having a predetermined width applied and formed on the can lid was separated, and this was tested at a pulling speed of 200 mfli / min at room temperature. Five measurements were performed for each sample, and the arithmetic average value was converted to a 1 cm width to determine adhesion (scm).

Example 7

Epoxy phenolic paint is applied to both sides of an ordinary tin free steel (TFS) plate with a plate thickness of 0.20mni so that the thickness after baking becomes 5 μm. Then, baking was performed at 210 t: for 10 minutes. The coated TFS plate was formed into a 211-diameter lid using a brush, and then the sealing compound was applied to the curled portion by a conventional method and dried. Next, on the outer surface of the lid, open a score of 58 mm in diameter, and open the score so that the remaining score / steel plate thickness is 0.23. A concentric circle with a diameter of 54 πιπι formed a second score with a square opening width of 1.0 mm and a taper angle of 130 °. The scoring portion of the lid material obtained in this manner was subjected to a rotating lining method using a nozzle lining device on the scoring portion of the cover material, and a vinyl chloride stisol cono, After applying the resin, it was heated at 200 t: for 2 minutes. This is the thickness of the resin coating 得 obtained. The size is 0.02 min, the protrusion from the opening score to the outside is 1 mm, and the resin for the opening score and the varnish score is not defective. It was covered with. Finally, a tab made from a 0.35 m ni coated TFS board is placed at a distance of 6 mm from the score to the adhesive fulcrum and the width of the adhesive layer at the adhesive fulcrum. Was bonded at 220 t using a Nylon 12-based film adhesive so that the thickness became 5 inra. Next, the inside surface of the lid was spray-coated with epoxy phenolic paint and baked at 190 for 4 minutes. Using the easy-open can lid thus obtained, the openability and the physical properties of the resin coating were evaluated.

Table 4 shows the results.

Table 4

Resin coating? !带 physical properties

Adhesive strength (g / cra) Strength (g / cm) Opening force Safety Corrosion resistance at score area Example 7 1 0 0 0 4 0 0 〇〇比較 Comparative example 5 ― ― XX

Comparative Example 6 2 1 0 0 6 0 X 比較 Comparative Example 7 1 3 0 0 1 0 0 〇 X 〇 Comparative Example β 7 7 0 〇 X △ Specific Example 9 7 0 0 1 0 OX 〇

Comparative Example 5

The easy-opening property of Comparative Example 5 in which the opening tab was provided in the same manner as in Example 7 without providing the resin-coated band on the cover material having the opening score and the second score as in Example 7. A can lid was made and its openability was evaluated.

Comparative Examples 6 to 9

The coating, lid molding, scoring, and resin coating lining are the same as in Example 7, except for the adhesive strength and strength of the PVC blastosol resin coating 带. Then, the easy-opening can lids of Comparative Examples 6 to 9 in which tab molding and tab adhesion inner surface correction were performed were prepared. Table 4 shows the results of evaluation of the openability using these lids and the physical properties of the resin-coated layer.

According to this result, the varnish score was provided inside the opening score of the can lid, and the resin coating was provided so that the second score could be filled. In the case of Example 4 in which the movement of the resin coating in the radial direction is prevented and the physical properties of the resin-coated band are within a specific range, there is no risk of hitting the opening and injuries to the hands. However, even if the resin coating is provided, the effect of opening with a low force can be obtained without affecting the opening force. In addition, since both score parts are completely covered with the resin coating, there is a feature that a container having excellent corrosion resistance is provided.

Comparative Example 5 is a case of an easily-openable can lid without a resin-coated band. With this lid, there is a risk of injury to the fingertips due to the exposed edge of the opening when opening. Also score The part of the part is exposed by retorting because the ground iron is exposed by processing.

Comparative Examples 6 to 9 are examples in which the physical properties of the resin coating are inappropriate even when the resin coating is formed in a predetermined suitable shape.

In Comparative Example 6, the adhesive strength exceeded 200 Scm, the separation of the covering was difficult over the entire surface, the influence on the opening force of the lid became large, and the mouth could not be opened. This is the case. (When formula (1) in the description is not satisfied)

Comparative Example 7 is a case where the coating was not separated from the periphery of the can lid at the time of opening, was broken, and the cut edge was not sufficiently protected. (When equation (3) in the description is not satisfied) ''

Comparative Example 8 When the adhesive strength was less than 10 g / cm, it was difficult to fix the coating band to the lid, and the coating layer was separated after retorting. (When formula (1) in the description is not satisfied)

Comparative Example 9 is a case in which when the strength of the covering becomes less than 20 Scm, the covering is cut off at the time of opening and the cut edge of the opening cannot be sufficiently protected. (When formula (2) in the description is not satisfied)

According to the present invention, by using a resin-coated belt that satisfies the equations (1) to (3) at the same time, the resin-coated belt should be opened while preventing the resin-coated belt from breaking. Of the covering band to the part Fixing and peeling of the coating from the periphery of the can lid can be reliably performed.

Example 8

エ Apply a certain amount of epoxy-phenol paint to both sides of a normal tin free steel (TFS) plate with a thickness of 0.20 mm so that the thickness after baking becomes 5 m. Baking was performed at 210 t for 10 minutes. This painted TFS plate is molded into a lid for 211-diameter using a brush, and then the sealing compound is applied to the curl part by a standard method and dried. Was Next, inside the part where the opening scoring is to be processed, a circumference of 53 mm in diameter from the center of the lid at a height of 0.35 and an angle of 0 'to the horizontal plane from the center of the lid A step was formed. Next, an opening scoring is formed on the outer surface of the lid in a circular shape with a diameter of 58 ram, concentric with this step, so that the remaining score / steel thickness is 0.23 mni. Was The scoring part and the step part of the lid material obtained in this way are subjected to a rotating lining method using a nozzle lining device and a PVC blastisol. After applying the compound, it was heated at 200 for 2 minutes. The thickness of the resin coating obtained in this way is 0.03 mm, the protrusion outward from the opening score is 2 mm, and the step from the opening score is stepped. Until then, the resin coating had been evenly applied. Finally, as in Example 7, the painted TFS tab and nylon :! The film was glued with 220 using a two-layer film adhesive, and the tab was bonded and fixed to the lid. Further, the inner surface was corrected and the obtained easy-open can lid was used. The same evaluation as in Example 7 was performed. Table 5 shows the results. Table 5

According to this result, a step having a predetermined shape is provided inside the opening score of the can lid, and the resin coating covers the step, and the physical properties of the resin-coated band are provided. In the case of the present embodiment where is within a specific range, it was possible to safely perform the operation with a low force without any injury to the hand at the opening. Also, since the scoring part was completely covered with the resin coating, a container with excellent corrosion resistance was obtained.

Prior to the description of Examples 9 to 12 and Comparative Examples 10 to 13, evaluation methods will be briefly described below.

1. State of organic resin coating

1-1 Coverage on score After obtaining the organic resin coating 蓋 by applying the organic resin around the outer surface of the lid, the score 3 covering the entire length of the core completely was obtained. A score of 9 to 95% of the total score length of the unscored scoring length is rated 2 and a rating of less than 95% is scored 1. Was.

2 Uniformity of coverage

Measure the width of the organic resin coated band obtained in 1-1 over the entire length, and evaluate the range of (the minimum width of the coated band) ÷ (the maximum width of the coated band) from 1 to 0.70 and the score of 3, 0.6 to 0.50. The range was rated 2 and the range less than 0.50 was rated 1. The development of the score in the actual can

-1 Immediately after heat sterilization

Tighten the lid with the organic resin coating on the can body of the Tuna No. 3 can filled with cutlet flavor according to the usual method. Observation of the appearance of the score on the stereoscopic microscope was carried out. A score of 3 was given when there was no emission at the score, and the ratio of the score to the score length was 9 9 Those with% 95% were rated 2 and those with less than 95% were rated 1.

-2

The heat-sterilized real cans obtained in 2-1 were stored at room temperature for a year and evaluated in the same manner as in 2-1. δ 2

3. Safety

Open the lid provided with the organic resin coating, visually observe the organic resin Φ on the cut end face of the opening piece, and rate that the organic resin tea is completely covered on the cut end face with a score of 3, If the ratio of the uncut end face length to the total cut end face length was 99 to 95%, the score was 2; if the ratio was less than 95%, the score was 1. .

Example 9

A commercially available electrolytic chromic acid treated plate with a metal chromium content of 100 mgZm ² and a chromium content in the non-ferrous metal chromium layer of 15 ingZ m ² (thickness 0.20 mm) An epoxy resin paint was applied to both sides of the coating so that the thickness after drying became 5 / zm, and the coating was baked at 21 for 10 minutes. The coated electrolytic chromic acid-treated steel sheet is formed into a lid for 211-diameter using a brush, and the sealing compound is then formed on the curled part by a conventional method. Was applied and dried. Next, scoring was performed on the outer surface of the lid in a circular shape with a diameter of 58 mm so that the remaining scoring thickness was 45 / zm.

Using the nozzle lining device, around the lid obtained in this way and the outer surface of the scoring part, the rotation speed of the lid was set at 800 RPM, and the distance between the tip of the nozzle and the lid was changed. At a distance of about 1 mm, apply a PVC blastidol compound (viscosity: 2000 cps) to a thickness of 60 nig / lid, and then apply it at 150 for 2 minutes. Matured.

The lid obtained in this way is coated with an aluminum alloy tab coated on both sides with an epoxy resin brown primer, a nylon adhesive. And bonded at 220 t. Spray paint on the inner surface of this lid with an epoxy-foil paint so that the thickness after drying becomes 6 Omg, then heat at 200 for 4 minutes. Burning was done.

With respect to the easy-opening can lid thus obtained, the state of the organic resin coating, the evaluation of the scoring part of the actual can, and the safety were evaluated. Table 6 shows the results.

Example 10 0, 1 1, 1 2

In Examples 10, 11 and 12, the thickness of the PVC / Blasti sol compound was 100 mg Z lid, 140 mg / lid, and 200 mg / lid, respectively. An easily openable can lid was manufactured in the same manner as in Example 9 except that the lid was changed, and each evaluation was performed in the same manner as in Example 9. Table 6 shows the results.

Comparative Example 10

After scoring was performed in the same manner as in Example 9, a tab made of an aluminum alloy was joined to the lid by rivets according to a conventional method.

A PVC blastisol compound was added to the lid obtained in the same manner as in Example 9 except that the distance between the tip of the nozzle and the lid was changed to about 3 mm. After spray coating, drying, and baking the epoxy unol paint, An evaluation was performed. Table 6 shows the results.

-1

5 Comparative Examples 1 1, 1 2 and 1 3

Comparative Examples 1 1 1 and 1 2 and 13 changed the thickness of the PVC ♦ Blastisol compound to 100 OingZ lid, 140 m / lid, and 200 nig / lid, respectively. Each evaluation was performed in the same manner as in Comparative Example 9 except for the following. Table 6 shows the results.

According to Examples 9 to 12 and Comparative Examples 10 to 13, the method of joining the tabs after forming the organic resin coating around the score section is as follows. How to set up lol

Compared to 10, not only is it possible to obtain an easy-to-open lid that excels in all of the state of the organic resin coating, the firing state of the score, and the safety at the time of opening, but also has excellent high-speed productivity. You can see it.

20 Table 6 Organic grease Organic resin 時 When grease is applied Organic 抝 Grease ¾ スコア実スコアスコアスコア ^

Of coating; rti 羞 times of shame te speed safety consideration

«(材 material (wg 堇) (RPM) Cover on the score [degree covered! Immediately after heat sterilization of the belt 1 year

»10» 100 1) 3 3 3 3 3 II

II 11 II 140 II 3 3 3 3 3

I) 12 II 200 II 3 3 3 3 3 II

) 1 60 II 1 1 1 1 1 Apply blastisol after joining tabs

II 11 1) 100 1 1 1 1 1

It 12 I) 140 II 1 1 1 1 1 II

It 13 1) 200 2 1 1 1 1 1)

Claims

The scope of the claims

(1) The scoring for the opening that defines the opening, the tab for the opening provided in the opening, and the scoring for the opening are provided so as to straddle over both sides of the opening. In the easy-open lid with the protective resin coating,

An organic resin coating is provided on the outer surface of the lid, and the protective resin coating is selected from the group consisting of anchor fillers, tackifiers, and amino resins. Both are formed from a vinyl chloride tea resin blastisol containing one kind of additive, and the organic resin coating film and the protective resin coating are separated from each other. Easy-open lid.

(2) At least a portion of the organic resin coating film where the protective resin coating band is provided is non-adhesive to the vinyl chloride resin, and the easy opening property according to claim (1) is used. lid.

(3) The easy-opening lid according to (1), wherein the anchor filler is an oxide, hydroxide or carbonate of a Group II metal of the periodic table.

(4) The claim that the anchor filler comprises heavy calcium carbonate, zinc oxide, magnesium oxide, or a combination of two or more thereof. The easy-opening lid according to the range (1).

(5) Blastizol is 100 to 100 parts by weight of vinyl chloride resin, 35 to 200 parts by weight of plasticizer and 1 to 90 parts by weight of filler for anchor. (1) The easy-opening lid according to the above (1), wherein the lid comprises a composition comprising: (6) A composition in which the blast sol contains 35 to 200 parts by weight of a plasticizer per 100 parts by weight of a vinyl chloride resin and 5 to 150 parts by weight of a tackifier. The easy-opening lid according to claim 1, further comprising:

(7) The easy-opening lid according to (1), wherein the organic resin paint is an epoxy paint.

(8) Claims in which the opening tab is adhesively fixed to the lid via a thermoplastic adhesive composed of an amide-based repeating unit and a no-maho-ester repeating unit. (1) Easy opening described.

(9) The easy-opening lid according to claim (1), wherein the protective resin coating is bonded to the lid such that the protective resin coating is bonded to the opening side and remains on the opening.

(10) The scoring for the opening that defines the opening, the tab for the opening provided in the opening, and the scoring for the opening are provided so as to straddle over both sides of the opening. Easy opening with protective resin coating.

The scoring surface of the lid is entirely coated with an organic resin coating, and at least the part of the organic resin coating where the protective resin-coated tea is provided is non-adhesive to vinyl chloride tea resin. The protective resin coating is formed of a filler for anchor and a blastol of vinyl chloride resin containing Z or amino resin, and is coated with an organic resin film. An easy-opening lid characterized in that it and the protective resin coating are separated and adhered to each other. 58

Blastisol is 35 to 200 parts by weight of plasticizer per 100 parts by weight of vinyl chloride tea resin, 1 to 90 parts by weight of anchor filler and 1 to 30 parts by weight The easy-opening lid according to claim 10, comprising a composition containing a part of an amino resin.

(12) A can lid-resin-coated diaper engagement mechanism for preventing the resin-coated diaper from moving in the radial direction is provided inside the can-opening score. An easy-opening lid as described in the claim (1Q).

(13) Can lid-resin coating The engagement mechanism is composed of a second score provided inside the opening score of the can lid, and the resin-coated cover is placed in the varnish core. The easily-openable can lid according to claim (12), which is provided so as to be filled.

(14) The can lid-resin coating mechanism comprises a rim portion or a step portion provided inside the opening score of the can lid, and the resin coating covers the rim portion or the step portion. The easy-open can lid according to claim 12, which is provided so as to cover.

(15) The resin coating is provided with a relatively small width from the upper part of the score to the periphery of the can lid, and the width from the upper part of the score to the opening should be as described above. The easy-to-open can lid according to claim (12), which is provided with a relatively wide width so as to reach the engagement mechanism.

(16) An opening score that defines the opening area provided on the can lid, and an opening score that is provided on the opening area. δ 9

An easy-opening can lid comprising a tab, and a resin coating for protecting the cut edge provided over the upper part of the score between the portion to be opened and the periphery of the can lid. In,

Both the opening of the can lid and the periphery of the can lid have the same outer coating, and the inside of the opening score of the can lid is used to prevent the resin coating from moving in the radial direction. A can lid is provided with a resin-coated band engagement mechanism.

200 g / cm> A> 10 s / cm T> 20 g / ci 2

T> — (A — C)

In the three formulas, A is the adhesive strength of the resin coating and the lid in the vertical width (cm), T is the strength of the resin coated band in the vertical width (cm), and C is the constant ( 9 0 0).

Resin coating that satisfies the requirements for opening.

3 There is a gap between the outer resin coating and the periphery of the can lid, so that the opening can be opened with the cut end covered with the resin coating. Openable can lid.

(17) forming a lid material into a lid and engraving at least one score to define a portion to be opened in the lid;

Prior to fixing the opening tab, the scoring is also covered so that the scoring is completely covered and straddles the scoring. Applying a coating of resin for protecting the scoring edge and opening the opening tab so that the tip for tearing is positioned on the covered scoring surface or its vicinity. A method of manufacturing an easy-opening lid, characterized by comprising a step of bonding and fixing to a sliding portion.

(18) Addition of at least 1% of the resin for scoring cut edge protection resin selected from the group consisting of anchor fillers, tackifiers and amino resin The method according to claim 17, wherein the method is formed from blastizol of a vinyl chloride resin having an agent.