Closure tie for tubes of film material for enclosing food, a method of forming the tie and apparatus for carrying out this method
AssigneeNaturin-Werk Becker & Co.
InventorsHans-Dieter Wittern, Fred Geyer
Life of this patent
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Abstract
A tube of film material for enclosing food has a closure tie with a suspension loop, the enclosure tie including the knot lying in a recess in the pleated tip of the film material. The recess in which the tie is located is formed by softening the tube by heating, for example, with warm air, infrared radiation, ultrasonic means, by previously heating the tie filament, or by treating the film material with solvents or softening agents. Apparatus is disclosed for carrying out the process.
Claims12
A tube of film material having a closed end for enclosing food and having a closure tie at said closed end, said tie being situated in a permanently, thermoplastically deformed groove-like recess in said film material, which tube is made of a thermoplastic or thermoplastic-like material, wherein:
- (1) the closed end is formed by gathering the tube in a region to be closed by said closure tie;
- (2) the gathered thermoplastic material is softened in the region where said closure tie is to be applied;
- (3) the gathered plastic is permanently deformed by pressure while in the softened condition to form said groove-like recess, and thereafter allowed to harden;
- and
- (4) said closure tie is firmly engaged within the said groove-like recess, formed in the gathered plastic by softening, deforming, and allowing to harden, whereby said closure tie will not slip from the gathered plastic under tension.
Dependencies are inferred from the claim text.