JP2008094467A - Metal cap excellently gripped - Google Patents
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Abstract
Description
本発明は、金属製キャップに関し、より詳細には、キャップに結露が生じたような場合でも滑ることなく開栓可能な優れたグリップ性を有すると共に耐傷性にも優れた金属製キャップに関する。 The present invention relates to a metal cap, and more particularly, to a metal cap that has an excellent grip that can be opened without slipping even when condensation occurs on the cap, and also has excellent scratch resistance.
清涼飲料水等を内容物とする容器は、冷却された後開栓されて内容物の注出が行われる。このため、大気中の水蒸気が冷却されたキャップ及び容器表面に凝結する。特に金属製キャップは熱伝導率が高いため、樹脂製キャップに比して結露の発生が多く、この結露水のために手が滑ってしまい開栓性が劣るという問題を有していた。 A container containing soft drinks or the like is opened after being cooled and the contents are poured out. For this reason, water vapor | steam in air | atmosphere condenses on the cooled cap and container surface. In particular, the metal cap has a high thermal conductivity, so that condensation occurs more often than the resin cap, and the dehydration water causes the hand to slip, resulting in poor openability.
このような問題を解決するため、殻体スカート部の頂板部に近接した部分には間隔をおいて複数個の穴が周状に配置され、ライナー材は、容器口部との密封係合部の外方において、前記穴の少なくとも一部を通してスカート部外周よりも外方に突出した滑り止用突起を有する滑り止めライナー付容器蓋が提案されている(特許文献１)。
また、浴室等で使用されるシャンプー等の容器における滑り止め技術として、容器本体外層に発泡ニスが用いられて、該発泡ニスの発泡部によって滑り止め用凸部を形成して成る容器が提案されている(特許文献２)。
In order to solve such a problem, a plurality of holes are circumferentially arranged at intervals in a portion near the top plate portion of the shell skirt portion, and the liner material is a sealing engagement portion with the container mouth portion. A container lid with a non-slip liner has been proposed that has a non-slip projection protruding outward from the outer periphery of the skirt through at least a part of the hole (Patent Document 1).
Further, as an anti-slip technique for containers such as shampoos used in bathrooms, etc., a container is proposed in which foamed varnish is used in the outer layer of the container body, and a non-slip convex part is formed by the foamed part of the foamed varnish. (Patent Document 2).
上記特許文献１に記載されたキャップにおいては、外表面の突起部による滑り止めという効果はあるものの、製造時または充填時のシュートによるスムーズな搬送が困難であったり、樹脂を押圧し、ライナー形状を形成すると共に突起部を形成するため、均一に形成する事ができず、キャップが握りにくく、グリップ性に劣るという問題があった。また、耐傷性の観点からは、表面に比較的大きな凹凸を形成することは好ましくなく、上記特許文献２に記載された容器に関する滑り止め技術をそのまま金属製キャップに適用することは困難である。 In the cap described in Patent Document 1, although there is an effect of anti-slip by the protrusion on the outer surface, smooth conveyance by a chute at the time of manufacture or filling is difficult, or the resin is pressed to form a liner shape. In addition to forming the protrusions, the protrusions cannot be formed uniformly, making it difficult to grip the cap and inferior gripping properties. From the viewpoint of scratch resistance, it is not preferable to form relatively large irregularities on the surface, and it is difficult to apply the anti-slip technique relating to the container described in Patent Document 2 to a metal cap as it is.
従って本発明の目的は、キャップに結露が生じている場合にもグリップ性及び開栓性に優れていると共に、耐傷性にも優れた金属製キャップを提供することである。 Accordingly, an object of the present invention is to provide a metal cap that is excellent in gripping and unplugging properties and excellent in scratch resistance even when condensation occurs on the cap.
本発明によれば、塗装金属板から成る金属製キャップであって、外表面の表面粗さが算術平均粗さ（Ｒａ）で表して１．６μｍ以上であり且つ鉛筆硬度が２Ｈ以上４Ｈ以下であることを特徴とする金属製キャップが提供される。
本発明の金属製キャップにおいては、塗装金属板の外面塗膜中に、膨張後の平均粒径が１０乃至４０μｍの熱膨張性中空粒子が塗料樹脂成分１００重量部あたり０．７乃至３．０重量部の量で含有されていることが好適である。
According to the present invention, a metal cap made of a coated metal plate, the outer surface having a surface roughness expressed by arithmetic mean roughness (Ra) of 1.6 μm or more and a pencil hardness of 2H or more and 4H or less. A metal cap is provided that is characterized.
In the metal cap of the present invention, the thermally expandable hollow particles having an average particle size after expansion of 10 to 40 μm are 0.7 to 3.0 per 100 parts by weight of the coating resin component in the outer coating film of the coated metal plate. It is preferable that it is contained in an amount of parts by weight.
本発明の金属製キャップによれば、キャップ表面に微小な凹凸が形成されているためグリップ性に優れ、キャップに結露が付着した状態でも優れた開栓性を有している。
またキャップ表面が鉛筆硬度で２Ｈ〜４Ｈと硬いため、表面粗さが算術平均粗さで１．６μｍ以上という凹凸があるにもかかわらず、耐傷性にも優れている。
また熱膨張性粒子の配合量を調整することにより、キャップ表面をつや消し面（マット面）にすることができ、この場合には特に外観特性にも優れている。
According to the metal cap of the present invention, fine unevenness is formed on the surface of the cap, so that the grip performance is excellent, and the cap opening performance is excellent even when condensation is attached to the cap.
In addition, since the cap surface is as hard as 2H to 4H in pencil hardness, it has excellent scratch resistance despite the surface roughness having an arithmetic average roughness of 1.6 μm or more.
Further, by adjusting the blending amount of the heat-expandable particles, the cap surface can be made a matte surface (mat surface), and in this case, the appearance characteristics are particularly excellent.
本発明の金属製キャップにおいては、外表面の表面粗さが算術平均粗さ（Ｒａ）で表して１．６μｍ以上、特に１．６乃至３．５μｍであり且つ鉛筆硬度が２Ｈ以上４Ｈ以下、特に３Ｈであること、が重要な特徴であり、これにより、耐傷性を損なうことなく、結露が付着した状態でのグリップ性を向上することが可能となるのである。
本発明の金属製キャップの上記作用効果は、後述する実施例の結果から明らかである。
すなわち、算術平均粗さ（Ｒａ）で表す表面粗さが１．６μｍ未満の場合には、グリップ性に劣っていると共に、本発明特有のマット感は得られておらず(比較例１〜３，５，１０)、また鉛筆硬度が２Ｈよりも柔らかい場合には、耐傷性に劣っているのに対して(比較例４〜９)、表面粗さ及び鉛筆硬度が本願発明範囲にある場合には、グリップ性及び耐傷性の両方を満足することが可能となるのである。
In the metal cap of the present invention, the outer surface has a surface roughness expressed by arithmetic mean roughness (Ra) of 1.6 μm or more, particularly 1.6 to 3.5 μm and a pencil hardness of 2H or more and 4H or less, In particular, 3H is an important feature, and this makes it possible to improve the grip performance in a state where condensation has adhered without impairing scratch resistance.
The above-described effects of the metal cap of the present invention are apparent from the results of Examples described later.
That is, when the surface roughness expressed by arithmetic average roughness (Ra) is less than 1.6 μm, the grip property is inferior and the mat feeling peculiar to the present invention is not obtained (Comparative Examples 1 to 3). 5, 10), and when the pencil hardness is softer than 2H, the scratch resistance is inferior (Comparative Examples 4 to 9), whereas the surface roughness and pencil hardness are within the scope of the present invention. It is possible to satisfy both grip and scratch resistance.
(塗装金属板)
本発明のキャップの成形に用いられる塗装金属板は、少なくとも金属板を未塗装で或いは保護用の下地ニスの上に、上述した表面粗さ及び硬度を有する外面塗膜を形成して成るものである。
本発明においては、上述した平均粗さを有する外面塗膜を形成するために、外面塗膜中に、膨張後の平均粒径が１０乃至４０μｍの熱膨張性中空粒子が塗料樹脂成分１００重量部あたり０．７乃至３．０重量部の量で含有されていることが好適である。
本発明においては、熱膨張性中空粒子を用いることにより、塗膜の形成と同時に凹凸の形成を行うことができ、生産性よく本発明のキャップを製造することができる。
熱膨張性中空粒子としては、粒子を構成する外包部分が、メチルメタクリレート、アクリロニトリル、メタクリロニトリル等から成り、外包粒子内にイソペンタン液、化学発泡剤等を内包物とするものであることが好ましい。
熱膨張性中空粒子は、一般に発泡前の粒径が５乃至２０μｍであり、これを１００乃至３００℃の温度で加熱することにより、粒径１０乃至４０μｍに膨張し、体積が８乃至６４倍に増大するものであることが好ましい。
熱膨張性中空粒子としては、エクスパンセル社製エクスパンセル、松本油脂製薬社製マツモトマイクロスフィアー、永和化成工業社製セルパウダー等を好適に用いることができる。
(Painted metal plate)
The coated metal plate used for molding the cap of the present invention is formed by forming an outer coating film having the above-described surface roughness and hardness on at least an uncoated metal plate or on a protective base varnish. is there.
In the present invention, in order to form the outer surface coating film having the average roughness described above, the thermally expandable hollow particles having an average particle diameter after expansion of 10 to 40 μm are contained in 100 parts by weight of the coating resin component in the outer surface coating film. It is preferably contained in an amount of 0.7 to 3.0 parts by weight per unit.
In the present invention, by using the thermally expandable hollow particles, it is possible to form irregularities simultaneously with the formation of the coating film, and it is possible to produce the cap of the present invention with high productivity.
As the thermally expandable hollow particles, it is preferable that the enveloping part constituting the particles is made of methyl methacrylate, acrylonitrile, methacrylonitrile, etc., and the encapsulated particles contain isopentane liquid, chemical foaming agent or the like as inclusions. .
The heat-expandable hollow particles generally have a particle size of 5 to 20 μm before foaming, and when heated at a temperature of 100 to 300 ° C., the particles expand to a particle size of 10 to 40 μm and have a volume of 8 to 64 times. It is preferable to increase.
As the thermally expandable hollow particles, EXPANSEL manufactured by EXPANSEL, Matsumoto Microsphere manufactured by Matsumoto Yushi Seiyaku Co., Ltd., cell powder manufactured by Eiwa Kasei Kogyo Co., Ltd. and the like can be suitably used.
本発明においては、前述した通り、外面塗膜中に膨張後の平均粒径が１０乃至４０μｍの熱膨張性中空粒子が塗料樹脂成分１００重量部あたり０．７乃至３．０重量部の量で含有されていることが好適である。
上記範囲よりも膨張後の平均粒径が大きい場合には、配合量を調節しても鉛筆硬度を本発明範囲に規定することが困難であり、その結果耐傷性を向上させることが困難になる。また配合量も上記範囲よりも少ない場合には、熱膨張後の平均粒径が上記範囲にある熱膨張性中空粒子を用いた場合でも、表面粗さを本発明範囲に調節することが困難であり、その結果グリップ性を向上させることが困難になる。一方上記範囲よりも配合量が多い場合には、耐傷性が劣るようになる。
In the present invention, as described above, the thermally expandable hollow particles having an average particle diameter after expansion of 10 to 40 μm in the outer surface coating film are in an amount of 0.7 to 3.0 parts by weight per 100 parts by weight of the coating resin component. It is suitable to contain.
When the average particle diameter after expansion is larger than the above range, it is difficult to regulate the pencil hardness within the range of the present invention even if the blending amount is adjusted, and as a result, it becomes difficult to improve the scratch resistance. . If the blending amount is less than the above range, it is difficult to adjust the surface roughness to the range of the present invention even when using thermally expandable hollow particles having an average particle size after thermal expansion in the above range. As a result, it becomes difficult to improve the grip. On the other hand, when there are more compounding quantities than the said range, scratch resistance will become inferior.
上記熱膨張性中空粒子を配合する外面塗料としては、エポキシ−フェノール塗料、エポキシ−アミノ塗料、ポリエステル系塗料、ウレタン系塗料等、従来金属製キャップの外面塗料に用いられていたすべての塗料を用いることができる。
外面塗料は４０乃至６０ｍｇ／ｄｍ２の塗工量で塗布されることが好ましく、また焼付けの条件は１７０乃至２００℃で８乃至１３分の範囲であることが、熱膨張性中空粒子の膨張を塗膜の形成と同時に行うことができるので好ましい。
As the exterior paint blending the thermally expandable hollow particles, all paints conventionally used for exterior paint of metal caps such as epoxy-phenol paint, epoxy-amino paint, polyester paint, urethane paint, etc. are used. be able to.
The outer surface coating is preferably applied at a coating amount of 40 to 60 mg / dm 2 , and the baking condition is 170 to 200 ° C. for 8 to 13 minutes, so that the expansion of the thermally expandable hollow particles is suppressed. Since it can carry out simultaneously with formation of a coating film, it is preferable.
金属板としては、ティンフリースチール、ブリキ等の各種表面処理鋼板やアルミニウム等の軽金属材料等、従来より金属製キャップに用いられている金属板を用いることができるが、特にアルミニウム又はアルミニウム合金であることが好ましい。
金属板の板厚は、一般に０．１８乃至０．２５ｍｍの厚みを有することが好ましく、特にアルミニウムの場合には、０．２２乃至０．２５ｍｍの厚みを有するのがよい。
本発明に用いる塗装金属板は、金属板表面に予め下地用ニスが施されていることが塗膜の密着性の点で好ましく、また外面塗膜の下層にオフセット印刷等による印刷層が形成されていてもよい。更に外面塗膜上には耐傷性を更に向上するために、仕上げニスが塗布されていてもよい。この場合でも、表面粗さが上記範囲となるように４０乃至６０ｍｇ／ｄｍ２の範囲の量で塗工されることが好ましい。
As the metal plate, various surface-treated steel plates such as tin-free steel and tinplate, and light metal materials such as aluminum can be used, and metal plates conventionally used for metal caps can be used, particularly aluminum or aluminum alloys. It is preferable.
In general, the metal plate preferably has a thickness of 0.18 to 0.25 mm, and in the case of aluminum, preferably has a thickness of 0.22 to 0.25 mm.
The coated metal plate used in the present invention is preferably preliminarily coated with a base varnish on the surface of the metal plate from the viewpoint of adhesion of the coating film, and a printed layer by offset printing or the like is formed on the lower layer of the outer coating film. It may be. Further, a finishing varnish may be applied on the outer surface coating film in order to further improve the scratch resistance. Even in this case, the coating is preferably performed in an amount in the range of 40 to 60 mg / dm 2 so that the surface roughness is in the above range.
(金属製キャップ)
本発明の金属製キャップは、上記塗装金属板を従来公知の絞り成形等によって、キャップ形状に成形する。
本発明の金属製キャップは、外面が上述した表面粗さ及び鉛筆硬度を有している限り、種々の形態をとることができるが、特にグリップ性がよく、キャップを旋回させやすいことから、旋回により開栓するタイプのキャップ、特に容器口部に螺子固定されるキャップであることが好ましい。
金属製キャップは、上記塗装金属板の上述した表面粗さ及び鉛筆硬度を有する塗装金属板を当該面が外面側となるように絞り成形し、次いで螺子部を形成し、必要によりタンパーエビデントバンド等を形成してキャップシェルを形成した後、ライナー材をキャップシェル頂板部内面に形成することにより作成される。
(Metal cap)
In the metal cap of the present invention, the coated metal plate is formed into a cap shape by a conventionally known drawing or the like.
The metal cap of the present invention can take various forms as long as the outer surface has the above-mentioned surface roughness and pencil hardness. However, the metal cap is particularly good in grip and easy to turn the cap. It is preferable that the cap is a cap that is opened by the above, particularly a cap that is screwed to the container mouth.
The metal cap is formed by drawing a coated metal plate having the above-described surface roughness and pencil hardness of the coated metal plate so that the surface is the outer surface side, and then forming a screw portion, and if necessary, a tamper-evident band. After forming the cap shell and the like, the liner material is formed on the inner surface of the cap shell top plate portion.
(算術平均粗さ)
ＭＩＴＵＴＯＹＯ社製の三次元表面粗さ試験機ＳＶ−６００を用いて測定し、ＪＩＳ Ｂ０６０１で定められた算術平均粗さＲａを算出した。
(Arithmetic mean roughness)
It measured using the three-dimensional surface roughness tester SV-600 made from MITUTOYO, and arithmetic mean roughness Ra defined by JISB0601 was computed.
(鉛筆硬度)
塗膜の機械的性質を評価する試験方法のひとつである引っ掻き硬度試験法（ＪＩＳ Ｋ５６００−５−４）で定められた鉛筆硬度試験を行った。
(Pencil hardness)
The pencil hardness test defined by the scratch hardness test method (JIS K5600-5-4), which is one of the test methods for evaluating the mechanical properties of the coating film, was performed.
（グリップ性）
作成されたスクリューキャップを、内容物として湯水が充填された、口部に螺子部が形成されたリシール缶に適用し、５℃の温度で２４時間冷蔵した。
冷蔵庫から取出し、温度２３℃及び湿度６０％ＲＨの条件下で１０分間経過させた後、キャップの滑りやすさ、開けやすさを１０人のパネルによって評価した。
◎：従来の金属キャップと比べ、非常に開け易い。
○：従来の金属キャップと比べ、やや開け易い。
△：従来の金属キャップと比べ、同等である。
×：従来の金属キャップと比べ、開け難い。
(Grip property)
The prepared screw cap was applied to a reseal can filled with hot water as a content and having a screw portion at the mouth, and refrigerated at a temperature of 5 ° C. for 24 hours.
After taking out from the refrigerator and allowing 10 minutes to pass under the conditions of a temperature of 23 ° C. and a humidity of 60% RH, the ease of slipping and opening of the cap was evaluated by a panel of 10 people.
A: Very easy to open compared to conventional metal caps.
○: Slightly easier to open than conventional metal caps.
(Triangle | delta): It is equivalent compared with the conventional metal cap.
X: It is hard to open compared with the conventional metal cap.
(マット感)
目視により判断し、下記の基準で評価した。
○：従来の金属キャップと比べ、マット感がある。
△：従来の金属キャップと比べ、ややマット感がある。
×：従来の金属キャップと比べ、同等である。
(Mat feeling)
Judgment was made by visual observation, and evaluation was performed according to the following criteria.
○: Compared with a conventional metal cap, there is a matte feeling.
(Triangle | delta): Compared with the conventional metal cap, there exists some mat feeling.
X: Equivalent to a conventional metal cap.
(耐傷性)
成形後のキャップ外面塗膜の傷つき、クラックを目視により判断し、下記の基準で評価した。
○：従来の金属キャップと比べ、傷つき、クラックは同等である。
△：従来の金属キャップと比べ、傷つき、クラックがやや見られる。
×：従来の金属キャップと比べ、傷つき、クラックが多く見られる。
(Scratch resistance)
The cap outer surface coating film after molding was scratched and cracked visually and evaluated according to the following criteria.
○: Scratches and cracks are equivalent compared to conventional metal caps.
Δ: Scratches and cracks are slightly seen as compared with conventional metal caps.
×: Many scratches and cracks are observed as compared with conventional metal caps.
(実施例１)
板厚０．２５μｍのアルミニウム板上に、下地ニス層（厚み０．５〜３．０μｍ）、印刷層(厚み０．５〜５．０μｍ)を形成し、外面塗料としてポリエステル系塗料を用い、この塗料の樹脂分１００重量部に対して、膨張後の平均粒径が２０μｍの熱膨張性中空粒子（フィラー（１））を０．７重量部配合し、１８０℃の温度で１０分間塗膜の焼付けを行うと同時に熱膨張性中空粒子を膨張させた。
次いで、この塗装金属板を用いて絞り成形を行い、口径３８ｍｍのスクリューキャップを作成した。評価結果を表１に示す。
(Example 1)
A base varnish layer (thickness 0.5 to 3.0 μm) and a printing layer (thickness 0.5 to 5.0 μm) are formed on an aluminum plate having a thickness of 0.25 μm, and a polyester-based paint is used as an outer paint. 0.7 parts by weight of thermally expandable hollow particles (filler (1)) having an average particle diameter after expansion of 20 μm are blended with 100 parts by weight of the resin content of this paint, and the coating film is applied at a temperature of 180 ° C. for 10 minutes The thermally expandable hollow particles were expanded simultaneously with the baking.
Subsequently, drawing was performed using this coated metal plate, and a screw cap having a diameter of 38 mm was produced. The evaluation results are shown in Table 1.
(実施例２〜４、比較例１〜４)
熱膨張性粒子の配合量を、表１に示すものに変えた以外は実施例１と同様にして、スクリューキャップを作成した。評価結果を表１に示す。
(Examples 2-4, Comparative Examples 1-4)
A screw cap was prepared in the same manner as in Example 1 except that the blending amount of the thermally expandable particles was changed to that shown in Table 1. The evaluation results are shown in Table 1.
(比較例５〜９)
熱膨張性粒子にフィラー（２）を用いて、配合量を、表１に示すものに変えた以外は実施例１と同様にして、スクリューキャップを作成した。評価結果を表１に示す。
(Comparative Examples 5-9)
A screw cap was prepared in the same manner as in Example 1 except that the filler (2) was used for the thermally expandable particles and the blending amount was changed to that shown in Table 1. The evaluation results are shown in Table 1.
(比較例１０)
熱膨張性中空粒子の代わりに、外面塗料の樹脂分１００重量部に対して２０重量部の発泡剤（ＡＤＣＡ）を使用した以外は実施例１と同様にして、スクリューキャップを作成した。評価結果を表１に示す。
(Comparative Example 10)
A screw cap was prepared in the same manner as in Example 1 except that 20 parts by weight of a foaming agent (ADCA) was used for 100 parts by weight of the resin component of the outer coating instead of the thermally expandable hollow particles. The evaluation results are shown in Table 1.
上記実施例における熱膨張性中空粒子は、以下のものを使用した。
フィラー（１）：エクスパンセル社製商品名「発泡体エクスパンセル」
膨張前の平均粒径が６〜９μｍ、膨張後の平均粒径が２０μｍ
フィラー（２）：エクスパンセル社製商品名「発泡体エクスパンセル」
膨張前の平均粒径が２８〜３８μｍ、膨張後の平均粒径が１２０μｍ
The following were used as the thermally expandable hollow particles in the above examples.
Filler (1): Product name “Expanded Expander” manufactured by Expansel
Average particle size before expansion is 6-9 μm, average particle size after expansion is 20 μm
Filler (2): Trade name “Expanded Expander” manufactured by EXPANSEL
Average particle size before expansion is 28-38 μm, average particle size after expansion is 120 μm
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| JP2011121609A (en) * | 2009-12-10 | 2011-06-23 | Csi Japan:Kk | Metal cap, method for manufacturing the same, closing device, and beverage-containing closing device |
| WO2013146228A1 (en) | 2012-03-27 | 2013-10-03 | 日本クロージャー株式会社 | Metal cap including foam coating film and method for manufacturing same |
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| KR20140138944A (en) | 2012-03-27 | 2014-12-04 | 니혼 클로져 가부시키가이샤 | Metal cap including foam coating film and method for manufacturing same |
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| KR101865991B1 (en) | 2012-03-27 | 2018-06-08 | 니혼 클로져 가부시키가이샤 | Metal cap including foam coating film and method for manufacturing same |
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