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    • 10. 发明专利
    • Easy-open can lid made of resin-coated steel sheet and method of manufacturing the same
    • 树脂涂层钢板易于开罐的方法及其制造方法
    • JP2013249138A
    • 2013-12-12
    • JP2013191656
    • 2013-09-17
    • Jfe Steel CorpJfeスチール株式会社
    • YAMANAKA YOICHIROKOJIMA KATSUMIKITAGAWA JUNICHIIWASA HIROKI
    • B65D17/28
    • PROBLEM TO BE SOLVED: To provide an easy-open can lid made of resin-coated steel sheet which can meet characteristics required for food can materials and to provide a method of manufacturing the easy-open can lid made of resin-coated steel sheet.SOLUTION: Opening grooves are formed on both surfaces of a can lid made of resin-coated steel sheet and a can is opened by breaking the opening grooves. The resin-coated steel sheet has resin layers which principally comprise polyester and are made of a double-layer structure on both surfaces. The resin layer as an adhesive layer with a steel sheet contains a block-free isocyanate compound and a residual degree of orientation of the polyester resin layer formed on the upper layer of the adhesive layer is 2-30%. A bottom cross-section shape of the opening groove assumes a curved surface having a radius of 0.1-0.5 mm and the thickness of the thinnest part is 0.035-0.075 mm. The can lid is manufactured by using a pair of upper and lower dies being curved surface dies having a top end radius of 0.1-0.5 mm with respect to a can lid panel made of a steel sheet of which both surfaces are covered with a resin layer and by performing extrusion molding such that the thickness of the thinnest part falls into the range of 0.035-0.075 mm.
    • 要解决的问题:提供一种能够满足食品罐材料所需特性的树脂涂层钢板的容易打开的罐盖,并提供一种制造由树脂涂覆钢板制成的易开罐盖的方法。 解决方案:在由树脂涂覆钢板制成的罐盖的两个表面上形成开口槽,并且通过打开开槽来打开罐。 树脂被覆钢板具有主要包含聚酯的树脂层,并且在两个表面上由双层结构制成。 作为具有钢板的粘合剂层的树脂层含有无嵌段异氰酸酯化合物,并且形成在粘合剂层的上层上的聚酯树脂层的残留取向度为2-30%。 开口槽的底部截面形状呈现为半径为0.1-0.5mm的曲面,最薄部分的厚度为0.035-0.075mm。 通过使用一对上模具和下模具来制造罐盖,所述上模具和下模具相对于由两个表面被树脂层覆盖的钢板制成的罐盖板,其顶端半径为0.1-0.5mm的曲面模具 并且通过进行挤出成型使得最薄部分的厚度落入0.035-0.075mm的范围内。