Sheet material containing cellulose-based regenerated fibers arranged in at least one nonwoven layer

Abstract

A sheet material comprising cellulose-based regenerated fibers arranged in at least one nonwoven fabric layer, and a method for producing the sheet material. The sheet material comprises at least one nonwoven fabric layer of cellulose-based webs produced using endlessly produced filaments, particularly produced by the solution blowing method. The sheet material has a density of 40 g / m². 2 ~70g / m 2 Basis weight, preferably 50 g / m² 2 ~60g / m 2 It has a basis weight, a liquid absorption capacity of less than 900%, preferably less than 800%, more preferably less than 700%, and a lotion release value of more than 4%, preferably more than 4.5%, and most preferably more than 5%.

Description

[Technical Field]

[0001] This disclosure relates to a sheet material comprising at least one nonwoven layer of cellulosic regenerated fibers, a method for producing such material, and a use of such material. [Background technology]

[0002] Several manufacturing techniques for producing nonwoven fabric layers are known in the art. Basically, nonwoven fabric materials can be produced either from stapled fibers or by a direct forming process, in which the nonwoven fabric layer consists of endlessly produced fibers that are deposited and collected on a conveyor belt in a random orientation.

[0003] The most common technique for producing nonwoven layers from staple fibers involves carding the fibers to form a fleece, followed by the use of water entanglement (or spunlace) to bind the fibers together. This technique is commonly referred to as "carded spunlace" and is very well known to those skilled in the art.

[0004] Direct forming techniques are also known by the term "spunbond method." The term "spunbond method" is a general term that encompasses all direct forming techniques, including "meltblown method" or "solution blow method." The following paragraphs describe the main characteristics of these techniques. In this disclosure, the terms "spunbond," "meltblown," and "solution blow" are used as defined in the following paragraphs. However, it should be noted that these terms are not used consistently in the literature and are often confused, used with different meanings, or used synonymously.

[0005] Synthetic spunbond nonwovens are manufactured by extruding molten plastic through a spinneret. In the spunbond process described first (e.g., as disclosed in UK Patent Application Publication 2114052 or European Patent Application Publication 3088585), the filament is extruded through a nozzle and stretched by a stretching unit located below it. A similar process is the meltblown process (e.g., US Patent Application Publication 5,080,569, US Patent Application Publication 4,380,570, or US Patent Application Publication 5,695,377), in which the extruded filament is stretched by high-temperature, high-speed process air as soon as it exits the spinneret nozzle. In both techniques, the filament is deposited in a random orientation on a deposition surface, such as a conveyor belt, to form a nonwoven fabric, which is then transported to a post-processing step and finally wound up as a nonwoven roll.

[0006] Directly formed nonwoven fabrics manufactured from molten plastic according to the process described above have a very low basis weight, for example, 10 g / m². 2 Therefore, it can be manufactured with high tensile strength. However, such nonwoven fabrics generally have insufficient absorbency in applications where absorbency is the primary function. In addition, such nonwoven fabrics have little to no biodegradability.

[0007] It is also known that cellulosic nonwoven materials can be manufactured according to spunbond technology, as described in U.S. Patent Application Publication No. 8366988.

[0008] To combine the mechanical stability of synthetic spunbond or meltblown nonwovens with the absorbent properties of pulp, European Patent Application Publication No. 0333211 describes a process for connecting, for example, hydrodynamically, synthetic meltblown nonwoven products, particularly polyester or polyolefin-based, with layers of cellulosic staple fibers or wet-laid pulp. Further development of this process (described, for example, in U.S. Patents No. 5,284,703, 5,587,225, and U.S. Patent Application Publication No. 2009 / 0233049) would enable the production of a wider range of products, particularly cheaper mass-produced products for the wipe market. Thus, by combining a modified airlaid process with the meltblown method, this process can produce absorbent nonwoven products in which, for example, pulp fibers are uniformly distributed throughout the synthetic polyolefin fiber matrix. Such products also suffer from their incomplete biodegradability.

[0009] From today's ecological perspective, the combination of synthetic materials, i.e., petroleum-based staple fibers and petroleum-based spunbond nonwovens made of polyester or polypropylene, with pulp is being questioned. Products specifically manufactured for the mass market that contain petroleum-based fibers or filaments are not fully biodegradable, and there are no suitable recycling methods for them. Composite nonwovens made from plastics and pulp are sold worldwide and, after a single use, eventually end up in landfills, rivers, or oceans. This generates microplastics, which are absorbed into the food chain, and their impact on life cannot yet be fully predicted. However, as shown in abrasion tests and subsequent microscopic examinations, a considerable amount of microplastics appear before and during use of such products, along with clear signs of material removal and fiber breakage.

[0010] The spunbond process that can be used for cellulosic materials is a solution blowing technique, disclosed, for example, in US6358461A and US6306334A. Cellulosic spun lumps, particularly lyocell spun lumps, are extruded and stretched by an airflow similar to that of the melt-blown process. However, the filaments are further contacted with a coagulant to regenerate the cellulose and produce dimensionally stable filaments before deposition onto the nonwoven fabric. The wet filaments are then deposited as a nonwoven fabric layer in a random orientation. In fact, the solution blowing method has little in common with the classic spunbond or melt-blown process for plastic melts as described earlier. Lyocell spun lumps are a solution with a cellulose content of only 7-14%. Therefore, during solution blowing production, not only the fiber-forming cellulose but also a large amount of solvent is extruded. The solvent is then extracted from the nonwoven fabric and recovered in a subsequent washing process.

[0011] International Publication No. 2012 / 090130 describes the production of nonwoven fabrics that do not contain plastics or chemical binders. In this process, a layer of wet-laid pulp is bonded to a second nonwoven fabric layer of regenerated cellulose fibers or endless cellulose filaments by water entanglement.

[0012] International Publication No. 2021 / 170610 discloses a composite nonwoven fabric comprising at least one spunbond cellulose nonwoven fabric manufactured according to a solution blowing method and at least one layer of biodegradable short fibers of biological origin.

[0013] Japanese Patent No. 6267913 discloses a solution-blown nonwoven fabric material manufactured according to the cupramonium process.

[0014] When impregnating nonwoven sheet materials with liquids such as lotions or cleaning solutions, good liquid absorption properties are required. To provide such good liquid absorption properties, prior art nonwovens are manufactured to have a high porosity combined with a pore shape that supports high liquid absorption. Cellulosic fibers generally improve the liquid absorption properties of nonwoven materials. Furthermore, bulkiness is preferable to improve liquid absorption. Only with sufficiently high liquid absorption can it be ensured that a sufficient amount of liquid can be released during use. However, a large amount of liquid is retained within the nonwoven structure without being released and disposed of as waste along with the product after use.

[0015] The object of this disclosure is to teach a method for reducing the amount of waste liquid remaining in a nonwoven material after use. A further object is to provide a sheet material that can provide the same performance as highly impregnated nonwovens known in the art, even when impregnated with a smaller amount of liquid. [Overview of the project]

[0016] This disclosure relates to a sheet material comprising at least one nonwoven layer of cellulose-based regenerated fibers, wherein the sheet material comprises at least one nonwoven layer of cellulose-based webs manufactured using endlessly manufactured filaments, particularly manufactured by a spunbond method, preferably by a solution blowing method, and the sheet material has a density of 40 g / m². 2 ~70g / m 2 Basis weight, preferably 50 g / m² 2 ~60g / m 2 The present invention relates to a sheet material having a basis weight, a liquid absorption capacity of less than 900%, preferably less than 800%, more preferably less than 700%, and a lotion release value of more than 4%, preferably more than 4.5%, and most preferably more than 5%.

[0017] As used herein, the term “endless manufactured filament” refers to a filament that is manufactured without interruption, for example by continuous extrusion through a spinneret, or supplied to a nonwoven fabric manufacturing unit, and has not undergone an intentional cutting process before forming a nonwoven fabric layer.

[0018] Cellulosic nonwoven layers produced by the spunbond method, preferably by the solution blowing method, allow for very fine and purpose-oriented adaptation of manufacturing parameters to produce nonwoven layers based on the preferred forms disclosed herein.

[0019] As used herein, the term “spunbond” refers to any process that directly forms a nonwoven fabric layer from an endlessly manufactured filament.

[0020] As used herein, the term “solution blow” refers to a process of forming a nonwoven layer from a cellulosic spin dope, particularly a lyocell spin dope. This process involves extruding the spin dope to form endless filaments, which are then stretched by an airflow and subsequently coagulated at least partially by a coagulant before being deposited on a deposition surface in a random orientation to form a nonwoven layer.

[0021] The inventors have surprisingly found that, according to the teachings disclosed herein, it is possible to reduce the liquid absorption capacity of a nonwoven material while simultaneously increasing the lotion rewet value of the same nonwoven material. This overcomes the common assumption that increasing the liquid absorption capacity is essential so that the nonwoven material can be impregnated with more liquid in order to increase lotion release. The present invention enables an overall reduction in the lotion required for the desired lotion release. Since lotion is a major cost factor in nonwoven products containing a lot of liquid, the present disclosure can lead to significant cost savings.

[0022] As shown in the examples, currently available non-woven sheet materials used in wet wipes and the like do not fall within the specified parameter ranges. Generally, it is presumed that high release values are achieved only with cellulose-based non-woven products having either a higher basis weight and / or a higher liquid absorption capacity. It would seem natural that reducing either (or both) of these parameters would also reduce the lotion release value. With the teachings disclosed herein, one of ordinary skill in the art will be enabled to increase the lotion release value into the specified range while maintaining (or even decreasing) the basis weight and / or the liquid absorption capacity. The features of the method that enable the simultaneous optimization of these conflicting parameters depend on the specific manufacturing method and are described in detail herein.

[0023] As used herein, the term "non-woven layer" refers to a flat non-woven structure manufactured according to any process known in the art, specifically according to any process described or referred to in the present disclosure.

[0024] As used herein, the term "sheet material" refers to a product comprising (or consisting of) one or more non-woven layers.

[0025] As used herein, the term "basis weight" (BW) refers to a value that can be measured in accordance with NSWP130.1.R0(15)[EN].

[0026] As used herein, the term "liquid absorptive capacity" (LAC) refers to a value that can be measured in accordance with NWSP010.1.R0(15)[EN].

[0027] The lotion release value can be measured in a roller pressing test according to the following protocol.

[0028] [[ID=Z3]] Cut out 10 samples measuring 20cm x 20cm from the sheet material. All samples are conditioned for 24 hours at 23°C (+ / -2°C) and 50% (+ / -5%) relative humidity. Weigh each sample to determine the weight of the unimpregnated sample. The sample is carefully impregnated with three-fold (3-fold) desalinated water by spraying. In the context of this disclosure, the term “three-fold” means that the weight of the impregnating liquid (i.e., desalinated water) is equivalent to three times the weight of the unimpregnated sample. Next, the samples are sealed in pouches of five each and stored at ambient temperature for two days to allow the fibers to homogenize and swell. The samples are opened and weighed separately to determine the weight of the loaded samples (WLS). Next, the liquid is squeezed out by passing each sample horizontally through a roller press set to a roller speed of 3 m / min and a pressure of 0.5 bar. The sample passes through the roller press in the direction of the machine of the sample material. Each sample is weighed again after squeezing to determine the weight of the squeezed samples (WSS). The weight (WL) of the liquid removed by compression is determined as the weight difference between the sample before and after compression, according to the formula WL = WLS - WSS. The lotion release value (LRV) is determined as the percentage of the weight of the liquid squeezed out relative to the weight of the impregnated sample, according to the formula LRV = (WL / WLS) × 100 [%].

[0029] This protocol allows the use of a roller press with a roller diameter of 110 mm and a roller length of 500 mm, such as the Foulard HVF500 41796, but the same measurement results can be achieved using an equivalent roller press.

[0030] It should be noted that the roller pressure test disclosed herein reflects very well the ability of a sheet material to release a certain amount of liquid during use. To the best of the applicant's knowledge as of the priority date of this invention, there is no standard test for this property of sheet materials, and therefore the test protocol described herein has been developed. It is evident from this application that the test protocol is simple and easy to implement, so that those skilled in the art will not encounter any difficulties in carrying out the presented test, thereby establishing the precise meaning of the parameters and making meaningful comparisons with the prior art.

[0031] The spunbond method, particularly the solution blowing method, allows for highly accurate and reproducible adaptation of properties, and in particular, the filament thickness, as well as the pore structure and distribution, can be controlled very easily over a wide range. Furthermore, the solution blowing method offers the controllability of the amount of fusion that may occur between different filaments when different filaments are deposited on a deposition surface. Fusion occurs when a nonwoven layer is formed while the filaments are not yet completely solidified. In practice, the amount of fusion is controlled mainly by adjusting the amount of coagulation solution applied to the newly spun filaments between the spinneret and the fleece forming section (i.e., the movable support on which the filaments are placed). In addition, the filament diameter and / or diameter distribution can be controlled by the dimensions of the spinneret, the pore diameter of the spinneret, the flow rate of the spinning dope, the stretching airflow, and the intensity of the coagulation agent spray.

[0032] As shown in the examples, it is possible to directly manufacture nonwoven sheet materials according to the parameters disclosed herein using a solution blowing process. The term “directly manufacture” means that no additional processing steps are required, such as the application of binders or the addition of further materials such as pulp.

[0033] For sheet materials that are technically and economically feasible, the liquid absorption capacity should be at least 300% (basis weight approximately 50 g / m²). 2(In the case of the material) it is considered that the lotion release value should be as high as possible. It is considered that a lotion release value of up to 12% or more can be achieved.

[0034] According to a preferred embodiment, the sheet can have a thickness of 0.35 mm to 0.6 mm, preferably 0.4 mm to 0.5 mm.

[0035] Thicknesses within this range are typically lower than most wipes currently on the market. Reducing the thickness can decrease liquid absorption capacity. Simultaneously, reducing pore volume can maintain or even increase lotion release. For example, pore volume can be reduced by manufacturing a relatively high bulk density.

[0036] The term "thickness" (TH) refers to a value that can be measured according to NWSP120.6.R0(15)[EN], Method A.

[0037] According to another preferred embodiment, the sheet material has a bulk density, defined as basis weight divided by thickness, of at least 100 kg / m². 3 Preferably at least 125 kg / m³ 3 It is possible.

[0038] As used herein, the term "bulk density" (BD) refers to basis weight divided by thickness.

[0039] It has been found that the lotion release value can be adjusted by changing the bulk density. Generally, the higher the bulk density, the higher the lotion release value. Although not bound by this theory, it is thought that higher bulk densities result in a decrease in the amount of voids and pores between fibers and / or filaments to which liquid can bind. Therefore, liquid uptake occurs mainly within the cellulosic fibers, surprisingly increasing the lotion release value.

[0040] In another preferred embodiment, the sheet material may include biodegradable short fibers, preferably pulp fibers, incorporated into the at least one nonwoven layer.

[0041] The biodegradable short fibers incorporated into the nonwoven fabric layer can be applied in such a way that they fill the voids within the structure, thereby increasing the bulk density. Therefore, this feature can be used to produce nonwoven sheet materials according to parameters such as those specified herein.

[0042] Biodegradable short fibers derived from biomaterials can be applied to fill the voids in nonwoven sheet materials, thereby further reducing the amount of voids and pores in the material and facilitating the creation of very compact structures. This has been found to further reduce liquid absorption capacity and, surprisingly, contribute to an increase in lotion release value.

[0043] As biodegradable short fibers of biological origin, for example, cellulosic pulp can be used, which can be applied to a nonwoven fabric matrix by either a wet-laid method or an air-laid method.

[0044] The technique for incorporating short fibers into nonwoven fabrics is known in the art, for example, from International Publication No. 2021 / 170610, filed by the same applicant. Where legally possible, the disclosure of International Publication No. 2021 / 170610 is incorporated herein by reference in its entirety.

[0045] In another aspect, the disclosure relates to the use of sheet materials, such as those disclosed herein, for manufacturing liquid-impregnated wipes.

[0046] Compared to prior art, less liquid is required to manufacture the liquid-impregnated wipes. Nevertheless, users experience the same or even better cleaning properties. To manufacture the wipes, a substrate consisting of a sheet material as disclosed herein can be cut, packaged, and impregnated with liquid (in any technically reasonable order).

[0047] In another aspect, the disclosure relates to a wipe comprising a sheet material as disclosed herein.

[0048] Such wipes can be impregnated with a smaller amount of liquid, which reduces costs and has a positive environmental effect.

[0049] Examples of wipes include, but are not limited to, cleansing wipes, cosmetic wipes, exfoliating wipes, polishing wipes, body care wipes, refreshing wipes, and deodorizing wipes.

[0050] According to a preferred embodiment, the wipe can be impregnated with a liquid.

[0051] If the wipes are impregnated with liquid during manufacturing, the reduced amount of liquid will decrease the weight, further reducing transportation costs.

[0052] According to another embodiment, the wipe can be impregnated with a liquid selected from the group including aqueous liquids, oil-based liquids, disinfectants, liquids containing cleaning agents, liquids containing skincare agents, and liquids containing makeup removers.

[0053] Therefore, cleaning wipes can be adapted to a wide range of possible applications.

[0054] According to another aspect, the present disclosure is a method for manufacturing a sheet material including cellulosic regenerated fibers arranged in at least one non-woven fabric layer, wherein the sheet material includes at least one non-woven fabric layer of a cellulosic web manufactured using endless filaments, particularly manufactured by the solution blow method, and the manufacturing parameters are 40 g / m 2 ~70 g / m 2 basis weight, preferably 50 g / m 2 ~60 g / m 2 basis weight, a liquid absorption capacity of less than 900%, preferably less than 800%, even more preferably less than 700%, and a lotion release value of more than 4%, preferably more than 4.5%, most preferably more than 5%, and relates to a manufacturing method selected to manufacture the sheet material having such values.

[0055] According to the teachings disclosed herein, one of ordinary skill in the art can select and adjust the manufacturing parameters to adjust the properties of the sheet material within a range that enables a liquid absorption capacity within the specified range. Similarly, the manufacturing parameters can be selected to adjust the properties of the sheet material within a range that enables a lotion release value within the specified range.

[0056] During the manufacture of the non-woven sheet material, due to the complex interaction of different manufacturing parameters, the optimal values of material properties such as bulk density and relative pore volume can only be specified in relation to the specific circumstances and parameters of a particular manufacturing process. However, with an understanding of the teachings disclosed herein, one of ordinary skill in the art can manufacture the sheet material within the claimed scope and select and find the manufacturing parameters necessary to achieve the effects disclosed herein. [[ID=​As used herein, the term "porosity" is defined as the fractional empty space contained within a material. Furthermore, the three-dimensional pore shape and the diameter of the fibers and / or filaments must be taken into consideration, and these can be adapted according to the teachings disclosed herein for the production of sheet materials according to specified parameters.

[0058] In the context of the solution blowing method (i.e., direct production from a lyocell spinning solution, which is in the form of substantially endless regenerated cellulose fibers), settings for producing sheet materials within the optimal values ​​disclosed herein can be found, for example, by following the following approach:

[0059] The following general principles apply to modify the properties of nonwoven materials. • Increasing the spinning dope throughput in the spinneret by constant stretching air pressure increases the filament thickness, fabric thickness, and basis weight of the nonwoven layer produced in this manner, provided the belt speed is kept constant. Increasing the stretch airflow at the spinneret results in a nonwoven layer containing finer fibers that are more closely intertwined. This generally increases bulk density and, consequently, results in a thinner layer with reduced liquid absorption capacity. • Increasing the speed of the support forming the nonwoven fabric layer reduces the thickness and basis weight of the nonwoven fabric layer. • To reduce liquid absorption capacity, the amount of voids and pores can be reduced. As a result, less liquid can be absorbed by the reduced voids, and the liquid is mainly incorporated into the cellulosic matrix of the filament. Reducing the amount of coagulant spray results in greater filament fusion within the nonwoven layer. The layer is manufactured in a thinner state with a higher degree of filament fusion (i.e., the filaments are sticky to each other). This makes the nonwoven layer more compact and reduces porosity. This also results in a higher bulk density and reduced thickness. • Higher coagulant spray intensity reduces filament fusion and increases bulk. By increasing the filament thickness and the amount of coagulation that reduces fusion, it is possible to produce even thicker and bulkier nonwoven layers.

[0060] As a starting point, the settings can be adjusted to produce a nonwoven material with the required basis weight, and the values ​​of the coagulant spray strength and the stretch air strength can be selected within the intermediate range of possible settings. Other parameters can be selected according to other requirements of the specific nonwoven material to be produced. It should be noted that under normal circumstances, the nonwoven material produced in this manner will not have the specific properties specified herein.

[0061] To find appropriate settings for the manufacture of nonwoven materials according to this disclosure, the manufacturing parameters are systematically adapted to reduce voids. Void reduction can be achieved, in particular, by increasing the stretch airflow and / or decreasing the coagulant spray intensity.

[0062] According to a preferred embodiment, the method includes one or more of the following features: According to NWSP120.6.R0(15)[EN], the thickness of the sheet material measured according to Method A is adjusted to a value of 0.35 mm to 0.6 mm, preferably 0.4 mm to 0.5 mm. The bulk density of the sheet material, defined as basis weight divided by thickness, is at least 100 kg / m². 3 A value of at least 125 kg / m³ 3 It will be adjusted to the value.

[0063] These thickness and bulk density ranges enable the production of resource-efficient final products.

[0064] A person skilled in the art, who is aware of the teachings disclosed herein, can adjust the manufacturing parameters to achieve and optimize these values ​​within a range of preferred values.

[0065] According to another preferred embodiment, biodegradable short fibers of biological origin, preferably pulp fibers, can be incorporated into at least one nonwoven fabric layer.

[0066] Several manufacturing techniques are known for incorporating short fibers, such as pulp (either in the form of a liquid suspension containing pulp or as dry fluff pulp), into the matrix of a nonwoven fabric layer. Non-exclusive examples include the card-type wet-laid pulp method, the card-type air-laid card method, or the technique disclosed in International Publication No. 2021 / 170610.

[0067] Preferably, the pulp is applied to the nonwoven fabric material by a wet-laid or air-laid method, and then the composite material can be pressed and compressed with a roller press and / or bonded by water entanglement.

[0068] The incorporation of short fibers allows for a reduction in voids and pores in the material. Furthermore, the pulp has a positive effect, among other things, on the softness and lotion release value of the product.

[0069] In yet another preferred embodiment, the nonwoven fabric layer of at least one cellulosic web can be subjected to roller press pressure without a drying history to adjust the thickness of the sheet material.

[0070] By adjusting the thickness in a state without drying history, the bulk density can be increased, and consequently, the lotion release value can be increased. The roller press can be applied directly to only the nonwoven fabric layer of the cellulose web, or to the nonwoven fabric layer after the incorporation of short fibers. Furthermore, the roller press process can be applied before or after the water entanglement process (if such a process is provided).

[0071] As used herein, the term “no drying history” refers to a nonwoven fabric layer after it has been deposited on a deposition surface, which remains in a moist state with an essentially fully swollen fibrous structure and has not been subjected to a heated airflow for drying.

[0072] In another aspect, the disclosure relates to the use of sheet materials manufactured according to any of the methods disclosed herein and / or disclosed herein for the manufacture of consumer goods and / or industrial products, the consumer goods and / or industrial products may preferably be selected from the group including wet wipes, cosmetic sheet masks, dry wipes designed to be moistened with liquid, liquid application systems, wound care products, and the like. [Examples]

[0073] The following nonwoven sheet material samples were prepared.

[0074] Comparison Material 1 As the first comparative sample, a conventional nonwoven material was prepared according to the carded spunlace method. The material was prepared using 1.7 dtex lyocell fibers with a length of 38 mm. The fibers were carded to form a fleece with the intended basis weight (see Table 1 below), and then spunlaced using five spunlace jet bars at a line speed of 100 m / min with an upward pressure setting.

[0075] Comparison material 2 As a second comparative sample, a conventional nonwoven fabric material was prepared according to the card-type spunlace method. The material was prepared using the same settings as comparative material 1, but using viscose fibers with a length of 38 mm and a density of 1.7 dtex.

[0076] Improved material 1 A nonwoven layer of cellulose-based web according to the teachings of this disclosure was manufactured using lyocell filaments produced endlessly by the solution blowing method. The manufacturing parameters were set to achieve high bulk density and thin thickness (by reducing the coagulant spray intensity to increase filament fusion and increasing the stretching airflow) in order to reduce liquid absorption capacity. The line speed and throughput were 20 g / m 2 The process was set to obtain a carrier material with a nominal basis weight of . Then, the material, which had no drying history, was impregnated with wet-laid pulp to a nominal basis weight of approximately 60 gsm, and the wet-laid pulp was entangled with water to bond to the carrier material. Before drying, the material was passed through a pressure roller to flatten the structure and further increase its bulk density. The composite was then dried and subsequently compressed into a very flat dry carrier-pulp composite material.

[0077] Improved material 2 A nonwoven layer of cellulose-based web according to the teachings of this disclosure was manufactured using lyocell filaments produced endlessly by the solution blow method. Compared to improved material 1, this material was manufactured without wet-laid pulp. The line speed and throughput were 60 g / m². 2 The process was set up to obtain a nonwoven fabric material with a nominal basis weight. To achieve a flat structure with high bulk density, relatively high filament extension (fine filaments) was used in combination with relatively high fusion (low solidification flow). Subsequently, the fabric was entangled with water at a low pressure setting to keep the material thickness at a low level. The material was then dried (causing further compression of thickness) and wound up.

[0078] Table 1 shows the main characteristics of the sample and the comparison sample. Basis weight measured according to BW - NSWP130.1.R0(15)[EN] TH - NWSP120.6.R0(15)[EN], thickness measured according to Method A Liquid absorption capacity measured according to LAC - NWSP010.1.R0(15)[EN] BD - Bulk density (basis weight divided by thickness).

[0079] [Table 1]

[0080] Table 1 shows that the liquid absorption capacity of the improved material was significantly lower than that of the comparative material. Furthermore, the improved material was thinner and had a higher bulk density compared to the comparative material.

[0081] For all samples and comparison samples, the liquid absorption capacity was determined according to the protocol disclosed herein. The measured values ​​are shown in Table 2. WLS - Weight of the impregnated sample WSS - Weight of compressed sample WL - Weight of the liquid squeezed out LRV - Lotion release value

[0082] All measurements were obtained from 10 independently measured samples for each material. For all cases, the measurement result (row x) and the standard deviation of the 10 measurements (row s) are given.

[0083] [Table 2]

[0084] Table 2 shows that both improved materials exhibited significantly higher lotion release values ​​than the comparison material, despite a decrease in liquid absorption capacity.

[0085] The inventors believe that a material having properties similar to improved material 1 can be produced by combining 40gsm pulp tissue paper in-line with a 20gsm carrier material that has not been dried, creating a 60gsm pulp composite, and then spunlacing and drying it.

Claims

1. A sheet material comprising at least one nonwoven layer of cellulose-based regenerated fibers, wherein the sheet material comprises at least one nonwoven layer of cellulose-based webs manufactured using endlessly manufactured filaments, particularly manufactured by the spunbond method, preferably by the solution blowing method, and the sheet material has a density of 40 g / m². ２ ~70g / m ２ The basis weight is preferably 50 g / m². ２ ~60g / m ２ A sheet material having a basis weight of less than 900%, preferably less than 800%, more preferably less than 700%, and a lotion release value of more than 4%, preferably more than 4.5%, and most preferably more than 5%.

2. The sheet material according to claim 1, wherein the sheet material has a thickness of 0.35 mm to 0.6 mm, preferably 0.4 mm to 0.5 mm.

3. The bulk density of the aforementioned sheet material, defined as the basis weight divided by the thickness, is at least 100 kg / m³. ３ Preferably at least 125 kg / m ３ The sheet material according to claim 1 or claim 2.

4. The sheet material according to any one of claims 1 to 3, wherein the sheet material includes biodegradable short fibers, preferably pulp fibers, incorporated into the at least one nonwoven fabric layer.

5. Use of the sheet material according to any one of claims 1 to 4 for manufacturing a liquid-impregnated wipe.

6. A wipe comprising the sheet material described in any one of claims 1 to 4.

7. The wipe according to claim 6, wherein the wipe is impregnated with a liquid.

8. The wipe according to claim 7, wherein the wipe is impregnated with a liquid selected from the group including an aqueous liquid, an oil-based liquid, a disinfectant, a liquid containing a cleaning agent, a liquid containing a skincare agent, and a liquid containing a makeup remover.

9. A method for manufacturing a sheet material containing cellulose-based regenerated fibers arranged in at least one non-woven fabric layer, wherein the sheet material is manufactured using endless filaments manufactured, particularly by the spunbond technique, preferably by the solution blow method, and comprises at least one non-woven fabric layer of a cellulose-based web, and the manufacturing parameters are 40 g / m ２ to 70 g / m ２ basis weight, preferably 50 g / m ２ to 60 g / m ２ basis weight, a liquid absorption capacity of less than 900%, preferably less than 800%, even more preferably less than 700%, and a lotion release value of more than 4%, preferably more than 4.5%, most preferably more than 5%, and the sheet material is selected to be manufactured in such a manner.

10. The method according to claim 9, comprising one or more of the following features. - NWSP120.

6. R0(15) [EN], the thickness of the sheet material measured according to Method A is adjusted to a value of 0.35 mm to 0.6 mm, preferably 0.4 to 0.5 mm. - The bulk density of the sheet material, defined as basis weight divided by thickness, is at least 100 kg / m². ３ A value, preferably at least 125 kg / m ３ It will be adjusted to the value.

11. The method according to claim 9 or 10, wherein biodegradable short fibers of biological origin, preferably pulp fibers, are incorporated into the at least one nonwoven fabric layer.

12. The method according to any one of claims 9 to 11, wherein the thickness of the sheet material is adjusted by subjecting the at least one nonwoven fabric layer of the cellulose web to pressure from a roller press without any drying history.

13. Use of a sheet material as described in any one of claims 1 to 4, and / or use of a sheet material manufactured according to the method of any one of claims 9 to 12, wherein the consumer goods and / or industrial products are preferably selected from the group including wet wipes, cosmetic sheet masks, dry wipes designed to be moistened with liquid, liquid application systems, wound care products, and the like.

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