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BR-112025016025-B1 - Sewing material comprising regenerated cellulosic fibers arranged in at least one layer of non-woven fabric, its uses and method of production, and moistened wipes.

BR112025016025B1BR 112025016025 B1BR112025016025 B1BR 112025016025B1BR-112025016025-B1

Abstract

SEWING MATERIAL COMPRISING REGENERATED CELLULOSIC FIBERS ARRANGEMENT IN AT LEAST ONE LAYER OF NON-WOVEN FABRIC. The present invention relates to a method for producing a sewing material and the sewing material comprising regenerated cellulosic fibers arranged in at least one layer of non-woven fabric. The sewing material comprises at least one layer of non-woven fabric made from continuously produced filaments, particularly produced by a solution blowing technique. The sewing material has a basis weight between 40 g/m2 and 70 g/m2, preferably between 50 g/m2 and 60 g/m2, a liquid absorption capacity of less than 900%, preferably less than 800% and even more preferably less than 700%, and a lotion release value greater than 4%, preferably greater than 4.5% and most preferably greater than 5%.

Inventors

  • KATHARINA GREGORICH
  • ANNA-SOPHIE FISCHER

Assignees

  • LENZING AKTIENGESELLSCHAFT

Dates

Publication Date
20260317
Application Date
20240402
Priority Date
20230414

Claims (10)

  1. 1. Sewing material comprising regenerated cellulosic fibers arranged in at least one layer of nonwoven fabric, characterized in that it comprises at least one layer of nonwoven fabric made from continuously produced filaments, particularly produced by the continuous spinning process, or by a solution blowing technique, wherein the sewing material has a basis weight between 40 g/m2 and 70 g/m2, or between 50 g/m2 and 60 g/m2, a liquid absorption capacity ranging from 300% to 900%, ranging from 300% to 800%, or ranging from 300% to 700%, and a lotion release value ranging from 4% to 12%, ranging from 4.5% to 12%, or ranging from 5% to 12%.
  2. 2. Sewing material, according to claim 1, characterized in that it has a thickness between 0.35 mm and 0.6 mm, or between 0.4 and 0.5 mm.
  3. 3. Sewing material, according to claim 1 or 2, characterized in that it has an apparent density, defined as the basis weight divided by the thickness, of at least 100 kg/m3, or at least 125 kg/m3.
  4. 4. Sewing material, according to any one of claims 1 to 3, characterized in that it comprises biodegradable short fibers, or pulp fibers, which are integrated into at least one layer of nonwoven fabric.
  5. 5. Use of a sewing material, as defined in any one of claims 1 to 4, characterized in that it is for the production of a moistened wipe filled with a fluid.
  6. 6. A moistened wipe, characterized in that it comprises a sewing material, as defined in any one of claims 1 to 4, and wherein the moistened wipe is loaded with a fluid, selected from a list comprising water-based fluids, oil-based fluids, disinfectant fluids, fluids comprising cleaning agents, fluids comprising skin care agents, and fluids comprising makeup removal agents.
  7. 7. Method for producing a sewing material, as defined in any one of claims 1 to 4, characterized in that in at least one layer of nonwoven fabric, the production parameters are selected to produce the sewing material, as defined in any one of claims 1 to 4.
  8. 8. Method according to claim 7, characterized in that at least one layer of nonwoven cellulosic fabric is subjected to the pressure of a roller press in a never-dry state to adjust the thickness of the sewing material.
  9. 9. Use of a sewing material, as defined in any one of claims 1 to 4, characterized in that it is for the production of consumer goods and/or industrial products, wherein the consumer goods and/or industrial products are selected from a list comprising wet wipes, cosmetic fabric masks, dry wipes designed to be moistened with liquid, liquid application systems, wound care products and the like.
  10. 10. Use of a sewing material produced according to the method as defined in claim 7 or 8, characterized in that it is for the production of consumer goods and/or industrial products, wherein the consumer goods and/or industrial products are selected from a list comprising wet wipes, cosmetic fabric masks, dry wipes designed to be moistened with liquid, liquid application systems, wound care products and the like.

Description

Description Field [001] The present description refers to a sewing material comprising regenerated cellulosic fibers arranged in at least one layer of nonwoven fabric, methods for producing such a material and use of such material. Description of the Related Technique [002] Several production techniques for the production of nonwoven layers are known in the specialty. Basically, nonwoven materials can be produced from chopped fibers or by a direct forming process, in which the nonwoven layer consists of continuously produced fibers that have been deposited and collected on a conveyor belt in a random orientation. [003] In the most common technique for producing layers of nonwoven fabric from staple fibers, a fleece is formed by carding the fibers and then by hydroentanglement (or spunlacing) to bind the fibers together. This technique is generally called "carded-spunlace" and is well known to those skilled in the art. [004] Direct forming techniques are also known by the term "continuous spinning process". The term "continuous spinning process" is a generic term that encompasses all direct forming techniques, such as "blowing process" or "solution blowing". In the following paragraphs, the main characteristics of these techniques are described. In the present description, the terms "continuous spinning process", "blowing process" and "solution blowing" are used as defined in the following paragraphs. However, it should be understood that these terms are not being used consistently in the literature and are frequently confused or used with different meanings or as synonyms. [005] Synthetic continuous filament nonwovens are produced by extruding molten plastics through a spinneret. In the continuous spinning processes initially described (such as those disclosed, for example, in GB2114052A or EP3088585A1), the filaments are extruded through a nozzle and released and stretched by a stretching unit located underneath. A similar process is the blowing process (e.g., US5,080,569A, US4,380,570A or US5,695,377A), in which the extruded filaments are drawn and stretched by hot, fast air as soon as they exit the spinneret nozzle. In both technologies, the filaments are deposited in a random orientation onto a depositing surface, for example, a conveyor belt, to form a nonwoven fabric, are taken to post-processing steps and finally wound as rolls of nonwoven fabric. [006] Nonwovens formed directly from melted plastics according to the processes mentioned above can be produced with very low basis weights, for example, 10 g/m2, and with high tensile strengths. However, these nonwovens generally have insufficient absorption properties for applications where absorption plays a role. Furthermore, these nonwovens are biodegradable to a small or no extent. [007] The production of cellulosic nonwoven materials according to continuous spinning process technology is also known from US8366988A. [008] To combine the mechanical stability of synthetic nonwovens from continuous spinning or blowing processes with the absorption properties of cellulose pulp, a process was described in EP0333211 in which a synthetic nonwoven product from a blowing process, in particular based on polyester or polyolefin, is connected with chopped cellulosic fibers or a layer of wet cellulose pulp, for example, in a hydrodynamic manner. Further developments of this process (for example, described in US5,284,703 and US5,587,225 and in US2009/0233049) allow the production of a wider range of products, in particular the mass production of a cheaper product for the wet wipe market. Thus, in this process, by combining a modified air deposition process with blowing process technology, for example, it is possible to produce an absorbent nonwoven product in which the pulp fibers are present in a homogeneous distribution state on a matrix of synthetic polyolefin fibers. These products also suffer from incomplete biodegradability. [009] From the current ecological point of view, the combination of synthetic staple fibers, i.e., petroleum-based, as well as nonwovens produced by the continuous spinning process based on petroleum, produced, for example, from polyester or polypropylene, with cellulose pulp is questionable. Products manufactured specifically for the mass market, which contain petroleum-based fibers or filaments, are not completely biodegradable, nor are there adequate recycling methods for them. Nonwoven fabrics composed of plastic and cellulose pulp are sold worldwide and end up in landfills, rivers or oceans after a single use. Thus, microplastics are generated, which are absorbed by the food chain and whose effects on life cannot yet be fully predicted. However, significant quantities of microplastics appear even before, during the use of such products - as demonstrated in abrasion tests and subsequent microscopic examination, with clear signs of material removal and fiber breakage. [0010] A continuous spinning process that can be used for cellulosic