Claims
- 1. 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.
- 2. A tube of film material according to claim 1, characterized in that the film material consists of polyamides, polyesters and/or polyvinylidene chloride mixed polymers.
- 3. A tube of film material according to claim 1, characterized in that the closure tie material is a filament of natural fibres, preferably hemp, flax, sisal or mixtures thereof.
- 4. A tube of film material according to claim 1, characterized in that the closure tie material is a filament or wire of plastic material, preferably drawn polyethylene, polypropylene, polyamide or polyester.
- 5. A tube of film material according to claim 1, characterized in that the closure tie material has a breaking strength of at least 20 kg as determined in accordance with German Standard DIN No. 55 834.
- 6. A tube of film material as defined in claim 1, wherein the pressure for forming said groove-like recess is applied in tying said closure tie about said gathered, softened plastic.
- 7. A tube of film material according to claim 1, characterized in that the film consists of thermoplastic material, of a fibre-reinforced regenerated cellulose with a thermoplastic coating, or of plasticized regenerated cellulose.
- 8. A tube of film material according to claim 7, characterized in that the film consists of a fibre-reinforced regenerated cellulose coated with a thermoplastic.
- 9. A tube of film material as defined in claim 1, wherein said gathered thermoplastic material is softened by one of heating and swelling.
- 10. A tube of film material as described in claim 9, wherein said recess is formed by softening said film material by warm air, infrared radiation, ultrasonic means, by pre-heating said closure tie, or by solvents or swelling agents.
- 11. A tube of film material according to claim 1 or 9, characterized in that the closure tie includes a knot disposed in a groove-like recess extending over the entire periphery of the gathered plastic end of the tube.
- 12. A tube of film material according to claim 1 or 9, characterized in that the closure tie includes a knot disposed in a recess in the gathered plastic end extending over only portions of the tube.
Parent Case Info
This is a continuation of application Ser. No. 007,295 filed Jan. 29, 1979, now abandoned.
US Referenced Citations (10)
Foreign Referenced Citations (16)
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FRX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
7295 |
Jan 1979 |
|