Packaged article covered with special film
AssigneeAsahi-Dow Limited
InventorTadashi Inoue
Life of this patent
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Abstract
A vessel such as a glass bottle having a narrow-necked portion is protected by coating with a stretched film of crosslinked polyolefin resin having specific characteristics. The film holds the vessel very tightly through the shrink tension of the heat-shrunk film at the narrower part and through the elastic tension of the elongated film at the wider part. The protected vessel has excellent effect for preventing scattering of glass fragments at the time of breaking as well as good display effect and cap-seal effect. The coated film has also good printability.
Claims13
In a packaged article comprising a shaped article having different circumferences of the cross-sections along the longitudinal axis thereof with a ratio of the maximum circumference to the minimum circumference of from 1.5 to 6 which is wrapped in a continuous transparent film, said film being a heat-shrunk product of a stretched crosslinked polyolefin resin film, the improvement which comprises the film having specific elastic characteristic at wider parts of the article with longer circumferences, thereby holding said film tightly through the elastic tension at the wider parts, the value of said characteristic ranging from 1 to 80% in terms of the specific percent shrink (A) as defined by the following formula:
- ##EQU4## wherein (x) is the maximum circumference of the film covered on the surface of said article and (y) the maximum circumference of the film released from said article and left to stand at 25.degree. C. for 10 minutes.
A process for packaging a shaped article having different circumferences of the cross-sections along the longitudinal axis thereof with a ratio of the maximum circumference to the minimum circumference of from 1.5 to 6, which comprises covering over the article a crosslinked polyolefin resin film, having heat-shrinkable property at least in the circumferential direction and being shaped in the form of a tube or a bag of which inner diameter is smaller than the maximum circumference and larger than the minimum circumference of the article, while giving a stretch of the film to a degree of 5 to 500% in the circumferential direction, and then heating said film to effect heat shrinkage.
Dependencies are inferred from the claim text.