Oji has patented a base sheet for a total heat exchanger element with high moisture permeability, low basis weight, and flame resistance. The sheet comprises calcium chloride in pulp with specific characteristics, offering excellent gas barrier properties. GlobalData’s report on Oji 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 Oji, Incontinence monitoring sensors was a key innovation area identified from patents. Oji's grant share as of January 2024 was 10%. Grant share is based on the ratio of number of grants to total number of patents.

The granted patent (Publication Number: US11828026B2) discloses a base sheet for a total heat exchanger element that includes calcium chloride in a paper base material. The paper base material must have specific characteristics, including a freeness of 200 to 600 ml, a bone-dry basis weight of 17 g/m2 to less than 23 g/m2, and a calcium chloride content of 6 g/m2 to less than 9 g/m2. The calcium chloride serves as both a flame retardant and a desiccant, eliminating the need for additional flame retardants or desiccants. The base sheet must exhibit moisture permeability of 2600 g/m2·24 h or higher at 20°C and 65% relative humidity, with flame resistance meeting specific standards. Additionally, the rate of moisture absorption falls within the range of 31% to 40%.

Furthermore, the patent includes additional claims related to the base sheet's thickness, density, air permeability, and composition. The base sheet should have a thickness of 40 µm or less, a density ranging from 0.9 to 1.2 g/cm3, and air permeability of 50 sec or more. The composition of the base sheet should consist of needle-leaved tree bleached kraft pulp in a percentage of 80 mass % or higher. Additionally, the base sheet may contain a wax selected from various options, such as polyethylene-based wax or paraffin wax, in specific amounts. The patent provides detailed specifications for the base sheet's bone-dry basis weight, calcium chloride content, and moisture permeability within certain ranges to ensure optimal performance in total heat exchanger elements.

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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.