Compagnie de Saint-Gobain patented a method for manufacturing a repair liner to reinforce pipes using a continuous fabric with specific layer widths and densities. The top layer acts as a guide during winding, ensuring only the top layer is visible on the final product. GlobalData’s report on Compagnie de Saint-Gobain 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 Compagnie de Saint-Gobain, Heater-integrated de-icing windows was a key innovation area identified from patents. Compagnie de Saint-Gobain's grant share as of January 2024 was 58%. Grant share is based on the ratio of number of grants to total number of patents.

Method of manufacturing repair liner for reinforcing pipes

Source: United States Patent and Trademark Office (USPTO). Credit: Compagnie de Saint-Gobain

A recently granted patent (Publication Number: US11885455B2) discloses a method for manufacturing a repair liner to reinforce pipes. The method involves selecting a continuous fabric with specific layers - a top layer, top intermediate layer, and bottom intermediate layer. The top layer, narrower than the fabric width, has a lower fiber density than the bottom intermediate layer. The fabric is wrapped around a mandrel with the top layer outward in an overlapping pattern, covering the liner's length. The top layer's width is less than ? of the fabric width, ensuring proper reinforcement.

Furthermore, the method includes specific steps such as moving the mandrel at a predetermined speed, rotating it away from the fabric, and forming loops with consistent axial length. The top layer is not overlapped along the liner's length, and a step is formed at its inner edge. The fibers in the top layer are randomly-oriented, with glass fibers commonly used. The fiber density in each layer is carefully controlled within defined ranges, ensuring optimal reinforcement properties. Additionally, the bottom intermediate layer is thinner along the fabric's outer edges than the centerline, enhancing the liner's overall structure and performance. The continuous fabric may also include a bottom layer below the bottom intermediate layer, further enhancing the liner's strength and durability.

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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.