Daio Paper has filed a patent for an individually-wrapped sanitary napkin. The napkin is folded lengthwise with a wrapping sheet and wrapped individually. It includes an inner surface sheet that contacts the skin, wing-like flaps with adhesive layers for securing them to underwear, and a separating sheet that covers the adhesive layers. The inner surface sheet contains a functional chemical with a specific function. GlobalData’s report on Daio Paper 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 Daio Paper, incontinence monitoring sensors was a key innovation area identified from patents. Daio Paper's grant share as of September 2023 was 74%. Grant share is based on the ratio of number of grants to total number of patents.

Individually-wrapped sanitary napkin with functional chemical in inner surface sheet

Source: United States Patent and Trademark Office (USPTO). Credit: Daio Paper Corp

A recently filed patent (Publication Number: US20230310230A1) describes an individually-wrapped absorbent article that offers improved functionality and convenience. The absorbent article is folded lengthwise with a wrapping sheet and individually wrapped. It includes an inner surface sheet that comes into contact with the skin and a pair of wing-like flaps with adhesive layers for securing the flaps to underwear.

In this patent, the wing-like flaps are folded towards the skin-contacting surface side, and the adhesive layers on the folded portions of the flaps are covered by a separating sheet. The inner surface sheet contains a functional chemical with a specific function in the area where the separating sheet is layered. This design allows for easy and hygienic individual wrapping of the absorbent article.

The patent also mentions different ways in which the functional chemical can be provided. It can be applied over the entire surface of a predetermined area, or multiple functional chemicals can be provided at intervals in the longitudinal or width direction of the absorbent article. Alternatively, the functional chemicals can be provided at intervals in both the longitudinal and width directions of the absorbent article. This flexibility allows for customization and targeted application of the functional chemical.

The wing-like flaps of the absorbent article are folded in the side portions that do not directly contact the inner surface sheet. The folding is done with the separating sheet at fold line positions along the crotch portion of the underwear when the absorbent article is worn. To assist with the folding process, fold assist lines are provided at these fold line positions. This ensures a secure and comfortable fit when the absorbent article is worn.

Additionally, side non-woven fabrics are provided lengthwise in both side portions of the skin-contacting surface side. The functional chemical is contained in the inner surface sheet between these side non-woven fabrics in both side portions. This arrangement enhances the effectiveness and efficiency of the functional chemical.

Overall, this patent presents an individually-wrapped absorbent article with improved functionality and convenience. The inclusion of a functional chemical and the various application methods described offer customization and targeted benefits. The folding design and use of fold assist lines ensure a secure and comfortable fit. This innovation has the potential to enhance the user experience and hygiene standards in the absorbent article industry.

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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.