開栓性、閉栓性及び密封性に優れたプラスチックキャップ

Plastic cap excellent in openability, closability and hermetical sealing

Abstract

PROBLEM TO BE SOLVED: To provide a plastic cap which is excellent in combined capacities including openability, closability and hermetical sealing. SOLUTION: For a plastic cap which is characteristic of having excellent openability, closability and hermetical sealing while being integrally formed of a thermoplastic resin and equipped with a top part, a skirt part and a seal-up part formed at the inside of the top part for fitting to a mouth of a container, the surface at the inside of the top part including the seal-up part is made rough, and the surface roughness for the seal-up part is set in a range of 1 to 5 μm (according to the maximum height Rmax based on JIS B0601) while the surface roughness for the internal surface closer to the inside than the seal-up part is set at 5 μm or more and becomes more rough than the surface roughness at the seal-up part.
(57)【要約】 【課題】 開栓性、閉栓性及び密封性の組み合わせに優 れたプラスチックキャップを提供するにある。 【解決手段】 熱可塑性樹脂で一体に成形された天面部 と、スカート部と、天面部の内面に形成された容器口部 との密封部とを備えたプラスチックキャップにおいて、 天面部は少なくとも密封部をも含めて内面側が粗面化さ れ、密封部の表面粗さ(JIS B0601に基づく最 大高さ、Rmax)が1乃至5μmの範囲にあり、且つ 密封部よりも内側の内表面の表面粗さが5μm以上であ って密封部の表面粗さよりも大きい表面粗さを有するこ とを特徴とする開栓性、閉栓性及び密封性に優れたプラ スチックキャップ。

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Cited By (13)

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    JP-2010237025-AOctober 21, 2010Japan Crown Cork Co Ltd, 日本クラウンコルク株式会社Apparatus and method of measuring bridge breakage angle of container lid
    JP-2012062087-AMarch 29, 2012Mikasa Sangyo Kk, 三笠産業株式会社合成樹脂製のキャップ
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