| 摘要 |
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. |
