Nippon Paper Industries has patented a method for manufacturing a paper barrier base material. This involves applying a water vapor barrier layer using a curtain coating method, with specific parameters for spinnability and solid content, ensuring stability and continuous operability of the coating liquid. GlobalData’s report on Nippon Paper Industries gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on Nippon Paper Industries, Sustainable packaging paper coating was a key innovation area identified from patents. Nippon Paper Industries's grant share as of July 2024 was 40%. Grant share is based on the ratio of number of grants to total number of patents.
The patent US12071728B2 outlines a method for manufacturing a paper barrier base material, focusing on the application of a water vapor barrier layer using a curtain coating technique. The method involves utilizing a coating liquid that comprises a water vapor barrier resin and a pigment, which must exhibit a spinnability of between 0.07 and 0.4 seconds at a solid content concentration of 32% by weight and a temperature of 25°C. The coating liquid is enhanced with a viscosity modifier, specifically ethylene-modified polyvinyl alcohol or sodium polyacrylate, to achieve the desired properties. The patent specifies the blending quantities of these modifiers, ensuring they remain within defined weight percentages relative to the pigment.
Additionally, the claims detail the inclusion of a water repellent and a surface-active agent in the coating liquid, which must maintain a static surface tension of 40 mN/m or less at the specified solid content and temperature. The water repellent can include paraffin-based compounds, and the patent outlines specific blending quantities for both the water repellent and the surface-active agent. Furthermore, the coating liquid's solid content concentration is stipulated to be between 25% and 45% by weight. The method also allows for the application of a gas barrier layer over the water vapor barrier layer, enhancing the overall barrier properties of the paper material.
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