Method for providing a substrate with a barrier and a substrate comprising a barrier
AssigneeStora Enso OYJ
InventorsIsto Heiskanen, Kaj Backfolk
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Abstract
The invention relates to a method for providing a surface of a fiber based substrate with a barrier layer wherein the barrier layer is formed by depositing nanofibers on the surface by the use of electrospinning or meltspinning and wherein the film is formed by post treatment of the substrate. The invention further relates to a substrate comprising such a carrier layer.
Claims15
A method for producing a fiber based packaging material with a barrier layer, the method comprising providing a fiber based substrate having a surface, depositing ultrafine polymer fibers having a diameter less than 5 μm on the surface of the substrate by the use of electrospinning or meltspinning, and post treating the substrate together with the polymer fibers on the surface to cause the polymer fibers to melt and coalesce together into a barrier layer film on the surface of the substrate, wherein the post treating step comprises at least one of increasing the temperature of the ultrafine polymer fibers, applying pressure to the ultrafine polymer fibers, subjecting the ultrafine polymer fibers to an electric field, radiation curing of the ultrafine polymer fibers, and decreasing the temperature of the ultrafine polymer fibers.
A method for providing a surface of a fiber based substrate with a barrier layer which barrier layer is formed as a film by depositing nanofibers on the surface by the use of electrospinning or meltspinning wherein the film is formed by post treating the substrate together with the nanofibers on the surface, wherein the post treating causes the polymer fibers to melt to form the barrier layer film on the surface of the substrate, and wherein the nanofibers that are deposited comprise at least two components that are spun separately and simultaneously in order to deposit nanofibers of the components to the surface of the substrate in a single step.
A method for providing a surface of a fiber based substrate with a barrier layer which barrier layer is formed as a film by depositing nanofibers on the surface of the fiber based substrate by the use of electrospinning or meltspinning wherein the film is formed by post treating the substrate together with the deposited nanofibers on the surface, wherein the post treating causes the polymer fibers to melt to form the barrier layer film on the surface of the substrate, and wherein the surface of the fiber based substrate is provided with a separate coating layer before the nanofibers are deposited on the surface.
A method for providing a surface of a fiber based substrate with a barrier layer which barrier layer is formed as a film by depositing nanofibers on the surface of the fiber based substrate by the use of electrospinning or meltspinning wherein the film is formed by post treating the substrate with deposited nanofibers on the surface, wherein the post treating causes the polymer fibers to melt to form the barrier layer film on the surface of the substrate, and wherein the barrier layer further is provided with a functional property by addition of a functional additive.
Dependencies are inferred from the claim text.