Importance

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Abstract

A tube former for turning a strip of thin tube stock, e.g. plastic film, paper, metal foil etc., into a elongated tube comprises a former tube having a curved upper edge tapering from an apex downwardly on opposite sides thereof with a sheet metal winged member is secured along the curved upper edge and extending outward at an acute angle relative to the side of the tube. The winged guide has the wings ending in overlapping relation at one side of the tube and spaced apart so that a strip of thin tube stock drawn over the wings through the former tube is formed into an elongated tube with overlapping edges at the sides of the tube and may be flattened and seamed to produce a longitudinal seam along the side of the flattened tube. The tube former is used with a conventional tube forming apparatus where thin tube stock is fed from rolls over the former. A double sided strip of adhesive is fed along one side of the tube stock to form a releasable longitudinal seam which is pressed together by a press roller working against a backing tongue extending below the tube former. The formed tube is seamed crosswise by heat seal bars. The tube is filled before final sealing.

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First Claim