To my understanding, Corovin is a technology using to manufacture Nonwoven fabric. These fabric could either be polypropylens or polyesters, yet technique is first develop for polypropylene (Ref.1). Following is the phrase I borrowed from the book (p. 134): one type of cotton staple nonwoven is treated with sodium hydroxide to shrink bond the mat, the caustic causes the cellulose-based fibers to curl and shrink around one another as the bonding technique BS5852: 1979 Part 1 ignition sources ) & source 1 in accordance with Schedule 4 part 2 & Schedule 5 Part 3 (cigarette & match test for Invisible parts of covers) of The Statutory Instruments 1988 No 1324 Consumer Protection The Furniture & Furnishings (Fire) (Safety) Regulations 1988 & Amendment No 2358 1989. The wastewater industry is encouraging a standard definition (rather than one which varies with each producer) of flushability, including dispersibility, and third-party assessment or verification, such as by NSF International. They believe that products should be safe for both septic and sewer systems (flushable and dispersible, respectively). [14] Orange County Sanitation District has created a campaign, "What 2 Flush", which recommends flushing only the "three P's—pee, poop and [toilet] paper". [15] See also [ edit ] chemical bonding (wetlaid process): use of binders (such as latex emulsion or solution polymers) to chemically join the fibers. A more expensive route uses binder fibers or powders that soften and melt to hold other non-melting fibers together

Paulapuro, Hannu (2000). "4". Paper and Board grades. Papermaking Science and Technology. Vol.18. Finland: Fapet Oy. pp.95–98. ISBN 952-5216-18-7. Non-Woven In Filtration - A Review | Types Of Filtration | Scope Of Filtration - Textile Mates". Textile Mates. 2017-03-14. Archived from the original on 2017-03-18 . Retrieved 2017-03-17. Cost-Effectiveness:** Non-woven fabrics can often be produced at a lower cost compared to traditional woven fabrics due to the simpler manufacturing processes involved. A recent patent has been assigned to Fiberweb Corovin GmbH for manufacture of polyethylene-based, soft nonwoven fabrics as well (Ref.2). The abstract states: Apparel:** Non-woven fabrics can be used as interlinings, providing structure and shape to garments.What 2 Flush: Know what should go down the drain that is sewer safe", Orange County Sanitation District.

It also protects the cushion interiors efficiently against fire. It is inserted between the upholstery and the outer fabric in seats of airplanes, trains and buses, for example as well as in upholstered furniture. They ensure optimum safety in public buildings. Used for corovin. Absorbency:** Depending on the fibers used and the manufacturing process, non-woven fabrics can exhibit different levels of absorbency. This makes them useful for products like wipes, medical dressings, and more.melt-blown: fiber is bonded as air attenuated fibers intertangle with themselves during simultaneous fiber and web formation. calendering through heated rollers (called spunbond when combined with spunlaid webs), calenders can be smooth faced for an overall bond or patterned for a softer, more tear resistant bond Customizability:** Non-woven fabrics can be engineered to have specific properties such as softness, stretch, texture, and more, depending on the intended application.

Overall, non-woven fabrics offer a diverse range of properties and applications, making them an important part of the textile industry and various other sectors..Xiang, P.; Kuznetsov, A. V.; Seyam, A. M. (2008). "A Porous Medium Model of the Hydro entanglement Process". Journal of Porous Media. 11 (1): 35–49. doi: 10.1615/JPorMedia.v11.i1.30. Nonwovens can also start with films and fibrillate, serrate or vacuum-form them with patterned holes. Fiberglass nonwovens are of two basic types. Wet laid mat or "glass tissue" use wet-chopped, heavy denier fibers in the 6 to 20 micrometre diameter range. Flame attenuated mats or "batts" use discontinuous fine denier fibers in the 0.1 to 6 range. The latter is similar, though run at much higher temperatures, to melt-blown thermoplastic nonwovens. Wet laid mat is almost always wet resin bonded with a curtain coater, while batts are usually spray bonded with wet or dry resin. An unusual process produces polyethylene fibrils in a Freon-like fluid, forming them into a paper-like product and then calendering them to create Tyvek. The industry has attempted to define " flushability". They encourage voluntary testing of flushability by producers. They also encourage clear marking of non-flushable products as "No Flush" (rather than fine print on the bottom of products) including creating a "No Flush" logo. [13] Breathability:** Non-woven fabrics can be designed to be breathable, which makes them suitable for products like disposable diapers and medical garments. Spunlace nonwovens are made by a process called hydroentanglement. This process uses high-pressure jets of water to entangle fibers together, creating a strong, durable fabric. The process begins with a web of fibers, which can be natural or synthetic, laid out on a conveyor belt.