United States Patent
US Patent 6228316: Polypropylene film suitable for use in in-mold…
US 6228316 · granted 2001-05-08
Abstract
A voided opaque film based on high crystalline polypropylene having high modulus and low heat shrinkage and low heat distortion properties. Biaxially oriented monolayer film of about 1.75 to 4 mil thickness can be handled without crazing or other handling deficiencies encountered with conventional in-mold label candidates.
| Patent Number | 6228316 |
|---|---|
| Title | Polypropylene film suitable for use in in-mold labeling process |
| Filed | 1998-04-24 |
| Granted | 2001-05-08 |
| Inventor(s) | Moseley, III; Ben P. P. |
| Number of Claims | 6 |
Abstract
A voided opaque film based on high crystalline polypropylene having high modulus and low heat shrinkage and low heat distortion properties. Biaxially oriented monolayer film of about 1.75 to 4 mil thickness can be handled without crazing or other handling deficiencies encountered with conventional in-mold label candidates.
Claim 1
A process for applying a label to a plastic container using an in-mold labeling process comprising the steps of providing the label comprising a biaxially oriented, opaque,monolayer film including polypropylene, said film having a thickness of about 1.75 to 4.0 mils and containing about 4 to 30% by weight, based on the combined weight of the polypropylene and filler, of a void-producing opacifying filler, providing saidlabel with product identification and description indicia and information, inserting said label into a predetermined label placement area within a mold, and forming the plastic container in said mold, in a manner to bring said container into contact withthe label in the label placement area as said container is being formed, whereby said label is thereupon adhered to the container at the desired location on the container.
Claims
6 totalA process for applying a label to a plastic container using an in-mold labeling process comprising the steps of providing the label comprising a biaxially oriented, opaque,monolayer film including polypropylene, said film having a thickness of about 1.75 to 4.0 mils and containing about 4 to 30% by weight, based on the combined weight of the polypropylene and filler, of a void-producing opacifying filler, providing saidlabel with product identification and description indicia and information, inserting said label into a predetermined label placement area within a mold, and forming the plastic container in said mold, in a manner to bring said container into contact withthe label in the label placement area as said container is being formed, whereby said label is thereupon adhered to the container at the desired location on the container.