Coreless twist-ties
AssigneesKyowa Kabushiki Kaisha, Clements Industries, Inc.
InventorsYoshio Iwai, Kazuyuki Takahashi, Takeshi Hirota, Tomoji Abe, Isao Imanishi
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Abstract
A non-metallic coreless twist-tie is formed by melting polymeric material, extruding the material in an elongated form, cooling the material, than drawing the material at a rate of more than about 2.5 times. The tie can include glass beads. The polymer is preferably formed from polymeric resin having a degree of crystallization of about 10% to 60% at a crystallized temperature range of about 100.degree. C. to 250.degree. C. and can also include a quantity of fine glass beads. The resulting tie can be twisted and untwisted many times without breakage, is suitable for use in microwave ovens and is simpler to construct than multicomponent ties.
Claims21
A wireless twist-tie having a uniform cross-section adapted to be deformed from a ribbon into a releasable closure, comprising polymeric material extruded from polymeric resin having about 10 to 60% degree of crystallization in a crystallized temperature range of about 100.degree. C. to 250.degree. C. and drawn at a draw ratio of more than about 2.5 times.
A method of forming a twist-tie having a uniform cross-section adapted to be repeatedly deformed from a ribbon into a releasable closure, from melted polymeric material having a degree of crystallization between about 10% and 60% in a crystallized temperature range of about 100.degree. C. to 250.degree. C., comprising:
- extruding a ribbon from melted polymer resin having a degree of crystallization between about 25% and 60%;
- cooling the extruded ribbon;
- drawing the ribbon at a ratio of more than about 2.5 times.
A method of forming a wireless twist-tie adapted to be repeatedly deformed from a ribbon into a releasable twisted closure, comprising the steps of:
- providing a melt of polymeric material;
- extruding a ribbon of polymeric material from the melted polymeric material;
- cooling the ribbon to a temperature below 100.degree. C.;
- and
- drawing the extruded ribbon at a ratio of more than about 2.5 times and at a temperature between about 80.degree. C. and 150.degree. C.
Dependencies are inferred from the claim text.