Laminate for a bag for flowable material having an oriented polypropylene, and a bag made therefrom

Abstract

A bag for a flowable material comprising a plurality of walls coupled together by way of a plurality of seals to define a substantially fluid tight cavity. The plurality of walls each comprising a laminate structure comprising a sealant layer of a polyethylene material, a core layer of an oriented polypropylene material, and a cap layer of an EVOH material.

1 . A bag for a flowable material comprising:
 a plurality of walls coupled together by way of a plurality of seals to define a substantially fluid tight cavity, the plurality of walls each comprising a laminate structure comprising:
 a sealant layer comprising a polyethylene material; 
 a core layer comprising an oriented polypropylene material; and 
 a cap layer comprising an EVOH material. 
   
     
     
         2 . The bag for a flowable material of  claim 1  wherein at least one of the layers further includes a metallized vapor deposited layer thereon. 
     
     
         3 . The bag for a flowable material of  claim 2  wherein the metallized vapor deposited layer is deposited on a side of the core layer. 
     
     
         4 . The bag for a flowable material of  claim 2  wherein the metallized vapor deposited layer comprises aluminum. 
     
     
         5 . The bag for a flowable material of  claim 2  wherein the metallized vapor deposited layer comprises one of the group consisting of: metals, PVDC, aluminum oxide and silicon oxide. 
     
     
         6 . The bag for a flowable material of  claim 1  wherein the sealant layer further comprises: 1.8 mil thick 0.920 g/cc octene LLDPE (1.0 g/10 min MI). 
     
     
         7 . The bag for a flowable material of  claim 1  wherein the core layer further comprises 0.70 mil thick oriented polypropylene material. 
     
     
         8 . The bag for a flowable material of  claim 7  wherein the core layer further includes a treatment applied thereto, wherein the treatment is selected from the group consisting of: plain, corona, plasma and chemical. 
     
     
         9 . The bag for a flowable material of  claim 1  wherein the cap layer comprises a multi-sub-layer EVOH based layer. 
     
     
         10 . The bag for a flowable material of  claim 9  wherein the base of the EVOH layer comprises a propylene sub-layer. 
     
     
         11 . The bag for a flowable material of  claim 9  wherein the EVOH layer includes a plurality of polyethylene sub-layers sandwiched around an EVOH sub-layer. 
     
     
         12 . The bag for a flowable material of  claim 9  wherein the EVOH layer comprises a plurality of sub-layers including, at least one vinyl acetate sub-layer, a plurality of polyethylene sub-layers and an EVOH sub-layer surrounded by the plurality of polyethylene sub-layers. 
     
     
         13 . The bag for a flowable material of  claim 12  wherein the EVOH layer comprises five sub-layers, including, in order, a first linear low density polyethylene sub-layer, a second linear low density polyethylene sub-layer, a third linear low density polyethylene sub-layer, an EVOH sub-layer, and a forth linear low density polyethylene sub-layer. 
     
     
         14 . The bag for a flowable material of  claim 13  wherein the first linear low density sub-layer comprises a 0.55 mil 50% 12% VA (0.40 g/10 min MI)/50% 0.920 g/cc octene LLDPE (1.0 g/10 min MI) with anti-block, anti-oxidant, and slip additives. 
     
     
         15 . The bag for a flowable material of  claim 13  wherein the second linear low density sub-layers comprise a 0.20 mil 100% 0.924 g/cc anhydride modified LLDPE (2.2 g/10 min MI). 
     
     
         16 . The bag for a flowable material of  claim 13  wherein the third linear low density sub-layer comprises a 0.30 mil 29 mol % ethylene EVOH (3.8 g/10 Min MI). 
     
     
         17 . The bag for a flowable material of  claim 13  wherein the EVOH sub-layer comprises a 0.20 mil 100% 0.924 g/cc anhydride modified LLDPE (2.2 g/10 min MI). 
     
     
         18 . The bag for a flowable material of  claim 13  wherein the fourth linear low density sub-layer comprises a 0.55 mil 100% 0.920 g/cc octane LLDPE (1.0 g/10 min MI) with anti-block, anti-oxidant, and slip additives.