Process of embossing and perforating thermoplastic film
AssigneeMonsanto Company
InventorsWalter R. Dannheim, John A. McNaboe
Life of this patent
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Abstract
In the process of embossing film by continuously passing the film through a nip formed by cooperating pattern and backup rolls, the improvement of passing the embossed pattern while in registration with the pattern roll through a second nip to improve the pattern detail. The apparatus includes a second backup roll in pressurized contact with the pattern roll forming the second nip. The surface configuration of the rolls may be such as to locally perforate the film within the pattern.
Claims11
In the process of embossing and perforating a thermoplastic film which includes continuously passing such film through a nip formed by pattern and backup rolls to form an embossed pattern therein, the improvement which comprises:
- passing the embossed pattern while in registration with the pattern roll which previously formed said embossed pattern through a second nip formed with the same pattern roll, said embossed pattern in the second nip being drawn and perforated within permanent depressions in another cooperating backup roll to finalize the pattern detail.
In the process of embossing and perforating a thermoplastic film which includes passing such film through a nip formed by pattern and backup rolls to form an embossed and perforated pattern therein, the improvement which comprises:
- passing the embossed and perforated pattern while in continuous registration with the pattern roll which previously formed said embossed and perforated pattern through a second nip formed with the same pattern roll, said embossed and perforated pattern in the second nip being drawn within permanent depressions in another cooperating backup roll to enlarge the size of perforations formed in the previously embossed and perforated pattern.
Dependencies are inferred from the claim text.