Static of COF differential poly film ream wrap
View Patent ↗A solid plastic film wrapper with a Static Coefficient of Friction (Static COF) differential used for packaging paper products, and a method for producing the same.
1. A solid film ream wrapper, wrapped around a ream of paper, the solid ream wrapper comprising:
a first layer of polypropylene, or biaxially oriented polypropylene (BOPP) solid film;
a second layer of polypropylene, or biaxially oriented polypropylene (BOPP) solid film;
said first layer and said second layer having a Static Cling Coefficient of Friction (COF) differential; and
a third layer of polymer, copolymer, and/or terpolymer resin, alone or blended with polyester, or any known adhesive; said third layer interposed between said first and second layers.
2. The solid film ream wrapper of claim 1 wherein said copolymer and/or terpolymer resins comprise butene, hexene, and/or octene with ethylene in feed stocks.
3. The solid film ream wrapper of claim 1 wherein said first layer and said second layer have a thickness gauge between about 40 to 400.
4. The solid film ream wrapper of claim 1 wherein said first layer and said second layer have a Static COF differential of at least 0.02.
5. A method, for making a solid plastic ream film ream wrapper and wrapping a ream of paper, comprising:
conveying a first layer comprising a polypropylene, or biaxially oriented polypropylene (BOPP) solid film and a second layer comprising a polypropylene, or biaxially oriented polypropylene (BOPP) solid film toward a pair of nip rollers; said first and second layers having a static coefficient of friction differential of at least 0.02;
directing said first and second layers into an adjacent non-contact position with a polymer or adhesive layer on its respective opposite side prior to passing through said nip rollers;
passing said layers through said nip rollers; forming said laminated solid plastic film ream wrapper;
wrapping said solid plastic film ream wrapper around a ream of paper.
6. A method, for making a solid plastic ream film ream wrapper and wrapping a ream of paper, comprising:
coating or applying to one side of a solid plastic film layer any material that alters the static coefficient of friction of said coating layer;
conveying said coated film layer and a second plastic film layer having no coating to a pair of nip rollers;
said first and second layers having a static coefficient of friction differential of at least 0.02;
directing said first and second layers into an adjacent non-contact position with a polymer or adhesive layer on its respective opposite side prior to passing through said nip rollers;
passing said layers through said nip rollers; forming said laminated solid plastic film ream wrapper;
wrapping said solid plastic film ream wrapper around a ream of paper.
7. A method, for making a solid plastic ream film ream wrapper and wrapping a ream of paper, comprising:
conveying a first layer comprising a polypropylene, or biaxially oriented polypropylene (BOPP) solid film and a second layer comprising a polypropylene, or biaxially oriented polypropylene (BOPP) solid film toward a pair of nip rollers; said first and second layers having the same a static coefficient of friction;
directing said first and second layers into an adjacent non-contact position with a polymer or adhesive layer on its respective opposite side prior to passing through said nip rollers;
passing said layers through said nip rollers; forming said laminated solid plastic film ream wrapper;
coating or applying to only one side of said solid plastic film ream wrapper any materials that alters the static coefficient of friction of said coating layer
wrapping said solid plastic film ream wrapper around a ream of paper.