| 摘要 |
The method of making a packaging container of board material for liquids, which has been rendered impermeable by an internal coating of plastic, in which the container is provided with a double thickness wall portion in which the interior communicates with the interior of the container, in which the container is first filled and closed and thereafter at least one score line for separation is applied to the double-thickness wall portion, and at least one narrow weld edge is applied to both sides of the double-thickness portion for sealing the score line, and closely adjacent to the score line, which weld portion may readily be severed by lifting a strip of the material by one of the walls which can be gripped by the fingers. In another aspect, weld seams are provided at both sides of a score line, and may be formed simultaneously with the forming of the score line.
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