Container with high moisture barrier properties and a reclosable pour spout
View Patent ↗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.
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/m 2 /day (˜0 to .5 gm/100 in 2 /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; and
a 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.