| 摘要 |
<p>A powder proof container made of a plane punched out blank having a base material of cardboard or a similar stiff material which on the inner surface of the container to be manufactured has a layer (5) of a weldable material, and which is joined to a container sleeve (1) which is closed at both ends (2). The sleeve is joined edge to edge and is kept together under sealed condition by a joining strip (7) extending along the entire butt joint (8) and applied to the weldable material layer (5) on the inner surface of the container. The container is formed with an all around extending tear opening means (18) which is formed so that the cardboard based material (3) is partly punched through along two all around extending lines (10) and to a depth slightly spaced from the inner weldable material layer (5), and in that the inner weldable material layer (5) is completely cut through along two cut lines (11) provided in the area defined by the two punched lines (10) of the base material (3) and extending a slight distance into the base material. At one edge the base material with the weldable material has a projecting ear (12) which is contacting the outer surface of the container tube adjacent the longitudinal joint (8) and which is useful as a grab tongue (12) for enabling a tear opening of the container. </p> |
