In-mold label film and method
First Claim
1. An oriented polymeric in-mold label film comprising first and second laminae which provide said film with a top layer at a face side of the film and a base layer at a back side of the film, said top layer being ink-printable and said base layer comprising a heat-activatable adhesive, at least said first lamina being hot-stretched and annealed, said first and second laminae being combined to form said film as a linerless self-wound film, the heat shrinkability at each side of the film being balanced to a sufficient extent to limit curling of the film, said wound film being unwindable and processable, as a free self-supporting dimensionally stable film, through a printing press, heat-generating ink drying means, and die-cutting means.
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Abstract
An oriented polymeric in-mold label film comprises a hot-stretched, annealed, linerless self-wound film lamina and has a face layer for printing and a base layer which includes a heat-activatable adhesive. The heat-shrinkability of the film is balanced thickness-wise to minimize curl and allow the film to be printed in conventional label-printing presses. An antistat may be included only in the charge for the base layer which includes the heat-activatable adhesive. In the manufacture of labelled blow-molded containers, sheets and labels formed from the film may be handled at high speeds while maintaining accurate registration and dimensional and positional integrity even in the absence of any reinforcing backing, yet the labels perform well on deformable containers such as shampoo bottles.
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Citations
10 Claims
- 1. An oriented polymeric in-mold label film comprising first and second laminae which provide said film with a top layer at a face side of the film and a base layer at a back side of the film, said top layer being ink-printable and said base layer comprising a heat-activatable adhesive, at least said first lamina being hot-stretched and annealed, said first and second laminae being combined to form said film as a linerless self-wound film, the heat shrinkability at each side of the film being balanced to a sufficient extent to limit curling of the film, said wound film being unwindable and processable, as a free self-supporting dimensionally stable film, through a printing press, heat-generating ink drying means, and die-cutting means.
Specification