초록 ▼

A paperboard substrate that can be used to provide a food packaging particle is provided having a water vapor barrier layer comprising HDPE in combination with a nucleating agent which is extruded on to a paperboard substrate. The resulting substrate has sufficiently good water vapor barrier when pr

A paperboard substrate that can be used to provide a food packaging particle is provided having a water vapor barrier layer comprising HDPE in combination with a nucleating agent which is extruded on to a paperboard substrate. The resulting substrate has sufficiently good water vapor barrier when properties that dry foods such as cereals do not require a bag or inner liner as a separate moisture barrier.

대표청구항 ▼

1. An extruded paperboard laminate consisting of: a paperboard substrate having the first side and a second side;a first extruded layer of LDPE, extruded on to a first side of the paperboard layer;a layer of HDPE applied to the first layer, the HDPE layer further comprising a nucleating agent;a seco

1. An extruded paperboard laminate consisting of: a paperboard substrate having the first side and a second side;a first extruded layer of LDPE, extruded on to a first side of the paperboard layer;a layer of HDPE applied to the first layer, the HDPE layer further comprising a nucleating agent;a second extruded layer of LDPE applied the HDPE layer. 2. The laminate as defined in claim 1, wherein the HDPE layer and the LDPE layers are coated on the paperboard by a co-extrusion coating process or extrusion coatings in tandem. 3. The laminate as defined in claim 1, wherein the concentration of nucleation in the HDPE layer agent is between 500 ppm and 2500ppm following mixing in the extruder. 4. The laminate as defined in claim 2, wherein a melt temperature at an extrusion die is above 550° F. and below 650° F. 5. The laminate as defined in claim 1, wherein its WVTR is in the range of ˜0 to 8 gm/m2/day (˜0 to .5 gm/100 in2/day) at 100° F. and 90% RH measured with Mocon Permatran equipment for ASTM F1249-06. 6. The laminate as defined in claim 1, wherein the paper board is carton board, kraft board, solid bleached board, solid unbleached board, white lined chipboard, or container board. 7. The laminate as defined in claim 1, wherein the nucleation agent is selected from the group consisting of Group II metal salts of organic dibasic acids, calcium 1,2-cyclohexanedicarboxylate, organic pigments aromatic amide compounds and combinations thereof. 8. The extruded paperboard laminate according to claim 1, wherein the paperboard substrate has applied to a second side of the substrate an extruded layer of polypropylene. 9. The laminate as defined in claim 1, wherein the nucleation agent is selected from the group consisting of c-quinacridone, Cibantine Blue 2B, N,N′-dicyclohexylterephthalamide, N,N′-dicyclohexyl-2,6-naphthalene dicarboxamide, and combinations thereof. 10. An extruded paperboard laminate consisting of a paperboard substrate having the first side and a second side, the first side defining a food contact side;a first extruded layer of LDPE, extruded on to the first side of the paperboard layer;a layer of HDPE applied to the first layer of LDPE, the HDPE layer further comprising a nucleating agent; anda second extruded layer of LDPE applied the HDPE layer. 11. The extruded paperboard laminate according to claim 10, wherein the paperboard substrate has applied to a second side of the substrate an extruded layer of polypropylene.