The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 21, 1997
Filed:
May. 31, 1995
Cedric M Lulham, Gray Ct., SC (US);
Gloria G Toney, Greer, SC (US);
W. R. Grace Co.-Conn., Duncan, SC (US);
Abstract
A method for making a film which is useful in the packaging of newly formed blocks of cheese and demonstrates flexibility, extensibility, and improved sealing strength comprises extruding an ethylene vinyl acetate/very low density polyethylene sealing layer. In addition to barrier properties, flexibility and extensibility are, preferably, also provided by coextruding a core layer of ethylene vinyl alcohol copolymer containing at least 32% by weight of ethylene with the sealing layer. A preferred method for making a film comprises coextruding a core layer of ethylene vinyl alcohol copolymer, two intermediate layers each comprising a polyamide, at least one of which having an ionomer blended therewith, outer layers of very low density polyethylene, ethylene vinyl acetate, and anti-blocking agent, and adhesive polymeric materials to adhere the outer blend layers to the respective intermediate polyamide layers, immediately expanding the extrudate to a dimension appropriate for achieving the desired thickness of the final film, and cooling the film.