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US 12,415,343 B1Granted
Polypropylene-based sheet materials and methods for making the same
AssigneeAdvan Packaging Systems LLC
InventorKenneth J. VanderVelde
Life of this patent
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Abstract
Polypropylene-based sheet materials such as a polypropylene-based foam sheet material and a multilayered sheet material including the polypropylene-based foam as a layer are disclosed. The multilayered sheet material may include the polypropylene-based foam layer sandwiched between and adhered to outer polypropylene-based polymer films to provide a multilayered sheet material. The polypropylene-based foam sheet and multilayered sheet material including the polypropylene-based foam as a layer may be used in the production of printed products such as sign panels.
Claims17
A method of making a sheet material comprising:
- applying pressure to first and second opposite sides of a precursor foam sheet material comprising a polypropylene-based polymer and concurrently heating the precursor foam sheet material at a temperature at or above a temperature sufficient to relax and/or destress the polypropylene-based polymer and/or the precursor foam sheet material and less than a melting temperature of the polypropylene-based polymer to form a heated foam sheet material comprising the polypropylene-based polymer;
- and
- cooling the heated foam sheet material comprising the polypropylene-based polymer to form a heat treated foam sheet material comprising the polypropylene-based polymer.
Dependencies are inferred from the claim text.