Aseptic and liquid food packaging with aqueous multibarrier coatings and methods of making same
a multi-barrier coating, aseptic and liquid technology, applied in packaging, packaging paper, transportation and packaging, etc., can solve the problems of poor oxygen barrier performance about 75 percent relative humidity, poor oxygen barrier performance, and inability to meet the requirements of liquid packaging, etc., to achieve the effect of improving the barrier characteristics, manufacturability or other functions
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example 1
[0068]A solid bleached sulfate pre-coated with a composition including calcium carbonate and styrene-acrylate binder was used as the underlying substrate. The substrate was coated with an aqueous dispersion as shown in Table 2 below. Each coating layer was applied using a Meyer rod having the size designated in Table 2. After each coating, the layer was dried by forced air in a box oven at 200° F.
[0069]Moisture vapor transmission rate (MVTR) was measured via the wet cup technique with the coated layers (if present) oriented toward the liquid-filled water receptacle and placed in standard Tappi conditions.
TABLE 2Example 1Comp. Ex. AComp. Ex. BComp. Ex. CBottom LayerALD1—PVA2ALD1Meyer Rod Size152515Middle LayerPVA2——ALD Meyer Rod Size2515Top LayerALD1———Meyer Rod Size15MVTR60644635 57(g / m2 / day)1Joncryl ® 74-A from BASF Corporation.2Selvol ® Polyvinyl Alcohol 21-205 Solution from Sekisui Specialty Chemicals America, LLC.
[0070]As shown above, the composition and method ...
example 3
Coating System with Heat-sealable Layer Over Oxygen Barrier
[0074]An uncoated paper substrate was used as the underlying substrate. A first layer of polyvinylidene chloride (Diofan® B 204 from Solvay Specialty Polymers USA, LLC) was applied to the substrate with the wet and dry thicknesses shown in Table 1 via a Meyer rod having a size of 15. The layer was then dried by forced air in a box oven at 200° F. A second layer including a polyolefin dispersion (Hypod® 9105 from Dow Chemical Company) was then applied over the first layer with a wet and dry thickness of shown in Table 1 via a Meyer rod having a size of 15 and dried in the same manner as the first layer. The resulting coated substrate was visually inspected and found to be defect-free and smooth.
example 4
Coating System with Heat-sealable Layer Over Light-Blocking Layer
[0075]A solid bleached sulfate pre-coated with a composition including calcium carbonate and styrene-acrylate binder was used as the underlying substrate. The substrate was then coated with a mixture of a polyvinyl acetate dispersion and a carbon-black dispersion as shown in Table 4 below. The mixture was applied at the wet and dry thicknesses shown in Table 1 using a Meyer rod having a size of 12. After coating, the light-blocking layer was dried by forced air in a box oven at 200° F. A polyolefin dispersion was then applied over the first layer at the wet and dry thicknesses shown in Table 1 using a Meyer rod having a size of 15 and dried in the same manner as the first layer.
TABLE 4Example 4Bottom LayerPolyvinyl Acetate Disperson120 gCarbon-Black Dispersion24.5 g Meyer Rod Size12Top LayerPolyolefin dispersion3Meyer Rod Size151SUNBOND ™ 3410 from Omnova Solutions, Inc.2Aquablak ® 8328 from Solution Dispersions3Hypod ...
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