Importance

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Abstract

In packaging of articles such as chocolate bars the articles are wrapped on a packaging line by a respective one of sheet portions of a continuous packaging sheet in turn such that the longitudinally extending side edges are brought together and are sealed by a cold seal material together to form a sealed longitudinal fin seal along the article and ends of the sheet portions at each end of the article are sealed to enclose the article. The sheet portions are than severed each from the next to separate the wrapped articles. An improved tear strip is disclosed extending transversely across the sheet portion from a position at or adjacent the first side edge to a position at or adjacent the second side edge for guiding the tearing action of the sheet portion transversely when pulled. The tear strip is formed by applying, during the printing of the wrapping material for supply to the line, a band of a hot melt liquid material and causing the liquid material to set or harden and to bond to the surface with sufficient strength to guide the tearing action of the sheet portion in the transverse direction. The tear strip is arranged on the sheet inwardly of the fin seal such that the tearing action is commenced by a tab formed between notches in the fin and is guided in the sheet by the tear strip.

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First Claim