Westrock has been granted a patent for a coated paperboard container that is suitable for holding beverages. The container includes a paperboard substrate with an aqueous barrier coating on the interior surface and another aqueous barrier coating or non-barrier coating on the exterior surface. The container has a high repulpability yield of 75% or greater and a low wet rigidity loss of 50% or less. GlobalData’s report on Westrock 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 Westrock, multi-pack shrink wrapping was a key innovation area identified from patents. Westrock's grant share as of September 2023 was 54%. Grant share is based on the ratio of number of grants to total number of patents.

Coated paperboard container with high repulpability and wet rigidity

Source: United States Patent and Trademark Office (USPTO). Credit: Westrock Co

A recently granted patent (Publication Number: US11767639B2) describes a coated paperboard container for holding beverages. The container includes a paperboard substrate with a heat sealable aqueous barrier coating on the interior surface and another aqueous barrier coating or a non-barrier coating on the exterior surface. The coated container has a repulpability yield of 75% or greater and a wet rigidity loss of 50% or less.

The patent includes various claims regarding the performance characteristics of the coated paperboard container. These claims specify different repulpability yields, sidewall seam bond strengths, wet rigidity losses, water Cobb tests, staining brightness losses, blocking ratings, and fiber tear percentages. For example, the container can have a repulpability yield of 80% or greater, a sidewall seam bond strength of 30 pounds per inch or greater, a wet rigidity loss of 40% or less, a 30-minute water Cobb test of 20 g/m2 or less, a staining brightness loss of 20% or less, a blocking rating of 3.5 or less, and a fiber tear of 80% or greater when the container seams are separated.

The patent also describes a specific embodiment of the coated paperboard container for holding hot beverages. This embodiment includes a sidewall with a heat-sealed sidewall seam, a first aqueous barrier coating on the interior surface, and a non-barrier coating on the exterior surface. The container has a repulpability yield of 75% or greater, a sidewall seam bond strength of 30 pounds per inch or greater, and a wet rigidity loss of 20% or less. Additionally, the patent mentions a bottom wall with an aqueous barrier coating on the interior surface and another aqueous barrier coating or a non-barrier coating on the exterior surface.

In summary, the granted patent describes a coated paperboard container for holding beverages with specific performance characteristics. The container has a heat sealable aqueous barrier coating on the interior surface and another aqueous barrier coating or a non-barrier coating on the exterior surface. The patent includes various claims regarding repulpability yield, sidewall seam bond strength, wet rigidity loss, water Cobb test, staining brightness loss, blocking rating, and fiber tear percentage. The patent also describes a specific embodiment for holding hot beverages, including a heat-sealed sidewall seam and a coated bottom wall.

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GlobalData, the leading provider of industry intelligence, provided the underlying data, research, and analysis used to produce this article.

GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.