Tissuepapier

Abstract

Tissue paper comprising at least two tissue layers, wherein at least a first tissue layer comprises a first embossing with an embossing depth that is proportional to an embossing height of an embossing roll with which the tissue paper is manufactured, wherein the ratio of embossing height to embossing depth is about 0.22 to about 0.5.

Description

The invention relates to a tissue paper comprising at least two tissue plies and to a use of a tissue paper.Tissue papers are sufficiently known from the prior art. EP 1 226 310 B1 discloses a tissue material for the production of kitchen paper, toilet paper, cosmetic wipes and absorbent pads.It is an object of the invention to provide an improved tissue paper. In particular, it is the object of the invention to provide tissue paper which has a high quality with the lowest possible fibre content.The object is achieved according to the invention by means of a tissue paper comprising at least two tissue plies, wherein at least one first tissue ply comprises a first embossing with an embossing depth which is in relation to an embossing height of an embossing roll with which the tissue paper is manufactured, wherein the ratio of embossing height to embossing depth is about 0.22 to about 0.5.Furthermore, the object is achieved according to the invention by means of a tissue paper comprising at least two tissue plies, wherein at least one first tissue ply comprises a first embossing with an embossing depth of about 550 μm to about 900 μm and a basis weight of about 11 g / m 2 to about 25 g / m 2.Furthermore, the object is achieved according to the invention by means of a tissue paper comprising at least two tissue plies, wherein at least one first tissue ply comprises a first embossing with an embossing depth which is in relation to an embossing height of an embossing roll with which the tissue paper is manufactured, wherein the ratio of embossing depth to embossing height is about 0.22 to about 0.8, preferably about 0.5 to about 0.8, more preferably about 0.7 to about 0.8.If, within the scope of the invention, the term "about" is used in connection with values or value ranges, this is to be understood as meaning a tolerance range which the person skilled in the art would find to be customary; in particular, a tolerance range of ±20%, preferably ±10%, more preferably ±5% is provided.Insofar as different value ranges, for example preferred and further preferred value ranges, are specified in the present invention, the lower limits and the upper limits of the different value ranges can be combined with one another.Furthermore, the object is achieved according to the invention by means of a use of the above-mentioned tissue paper for producing toilet paper.A tissue paper comprising at least two tissue plies is proposed, wherein at least one first tissue ply comprises a first embossing having an embossing depth which is in relation to an embossing height of an embossing roll with which the tissue paper is manufactured, wherein the ratio of embossing height to embossing depth is about 0.22 to about 0.5.Furthermore, a tissue paper comprising at least two tissue plies is proposed, wherein at least one first tissue ply comprises a first embossing with an embossing depth of about 550 μm to about 900 μm and a basis weight of about 11 g / m 2 to about 25 g / m 2.The process of embossing tissue paper, especially in the production of multilayer products, comprises several steps. First, tissue plies are passed through one or more embossing rollers, particularly after the drying process, to produce a specific pattern on the surface. The tissue plies are passed between an embossing roll and a counter roll, the embossing roll being provided with a raised pattern which is transferred to the tissue bearings. The embossing process leads to a deformation of the tissue layer, wherein the depth of the embossing is substantially determined by the embossing height of the roll. By setting further parameters, the embossing depth can be advantageously influenced. After embossing, as a rule at least two plies of the embossed tissue are joined together, the embossings of the individual plies being matched to one another such that they form a firm and simultaneously flexible connection. This process can be supported by the use of adhesives or by mechanical connections, such as, for example, by a knob structure.Exemplary enumerations are to be regarded as not exhaustive in the sense of the invention, but rather can be supplemented within the scope of the general technical knowledge.One parameter during the embossing process is a surface temperature of the embossing roll.This can affect the transfer of the pattern to the tissue paper. A higher temperature can help the pattern be more sharply and precisely embossed into the tissue paper as the fibers become softer and more easily deformed. However, the temperature must be carefully controlled to avoid overheating of the tissue paper, which could lead to an undesired change in the paper structure or even to damage.A fine tissue fraction and in particular a length of the fine fraction also play a role in the quality of the tissue later perceived by the user. A higher fines content can reduce the strength of the tissue paper and result in more easy tearing during embossing. At the same time, the length of the fines affects the flexibility and softness of the final product. Shorter fines tend to produce a softer surface while longer fines contribute to the strength of the tissue paper. The ratio of embossing height to embossing depth or of embossing depth to embossing height can therefore be adapted to the specific fines content and the length of the fines in order to achieve an optimum result.The basis weight of the tissue is another parameter that can influence the embossing process. A higher basis weight means that the tissue is denser and heavier, making it more resistant to the embossing process. However, too high a basis weight may limit the flexibility of the tissue paper and impair hand feel. The embossing process must therefore be adjusted to take into account the basis weight in order to achieve a balanced relationship between strength, embossing quality and softness.The hand feel of the tissue, a subjective but user important parameter, is determined by a combination of softness, smoothness and firmness. The embossing process directly affects hand feel by forming the surface of the tissue paper and altering its structure. Deeper embossing can result in a rougher surface, while shallower embossing makes the tissue paper appear smoother. In addition, the pattern of the embossing itself contributes to tactile perception and can positively or negatively influence the hand feel depending on the design.A further parameter is a residual moisture of the tissue after the production process.This affects the embossing quality and strength of the tissue paper. Too high a moisture content may result in the tissue paper tearing during the embossing operation or the pattern not being cleanly transferred. At the same time, too low a residual moisture can lead to the tissue paper becoming brittle and losing its softness. The residual moisture must therefore be carefully monitored and controlled in order to ensure an optimum embossing result.Embossing tissue paper is a complex process in which various parameters such as the surface temperature of the embossing roll, the fines content and its length, the basis weight, hand feel and residual moisture are matched to produce a high quality final product.The advantage of a sharp embossing, which is achieved by the proposed ratio of embossing height of the embossing roll to embossing depth of the tissue ply or of embossing depth of the tissue ply to embossing height of the embossing roll, lies in the possibility of achieving a good hand feel with a simultaneously lower basis weight of the tissue paper. By adapting the embossing depth in relation to the embossing height of the embossing roll, the pattern is embossed clearly and deeply into the tissue paper, which leads to improved haptics. This deep embossment provides that despite its lower basis weight, the tissue paper gives a pleasing, soft feel that is normally expected only with heavier tissue papers. This allows high quality tissue paper to be produced which is light weight and yet provides the desired haptics and user-friendliness.In one embodiment of the tissue paper, it is provided that it is produced with an embossing roll, wherein at least one first tissue layer comprises a first embossing with an embossing depth which is in relation to an embossing height of the embossing roll, wherein the ratio of embossing depth to embossing height is about 0.22 to about 0.8, preferably about 0.5 to about 0.8, further preferably about 0.7 to about 0.8.A further advantage of this sharp embossing is the possibility of achieving a greater roll thickness with the same or even lower surface weight. The sharp embossing results in a better volume constancy and stability of the embossed pattern, resulting in an increased overall thickness of the tissue paper roll without having to increase the paper weight. As a result, it is possible to produce rolls which appear more bulky and thus more comprehensive for the consumer without additional material costs occurring. Or, rolls can be produced that have a roll thickness expected by the user but have a lower basis weight. It is particularly advantageous in this case that the above-mentioned advantages are largely independent of the pulp mixture, which enables greater flexibility in the selection of material and in the production process without having to enter into compromise in the quality of the end product.In one embodiment, it is provided that the at least one first tissue ply has been embossed at a surface temperature of at least the embossing roll at the embossing surface of about 60° C. to 160° C., preferably about 90° C. to about 130° C. This temperature span can directly affect thermomechanical properties of the paper fibers during the embossing process. At a temperature of about 60° C., in particular from about 85° C., the fibers, in particular the lignin and cellulose components present in the paper structure, start to soften easily. This facilitates the deformation of the tissue paper and enables more precise transfer of the embossed pattern. At temperatures ranging from about 90°C to about 160°C, this effect is enhanced, resulting in a clear and sharp embossment. The higher temperature causes the paper fibers to lose their original rigidity and to better conform to the embossed pattern. At the same time, the bonds between the fibers are loosened briefly by the heat, which assists in the formation of a clearly defined and stable embossed pattern. After cooling, the fibers retain the embossed shape, resulting in permanent embossing.In one configuration, it is provided that the embossing depth is produced by means of a surface temperature of at least the embossing roller at the embossing surface of about 60° C. to about 160° C., preferably about 90° C. to about 160° C., more preferably about 90° C. to about 120° C.It is advantageous during embossing at these temperatures that the tissue paper acquires an improved structure and a defined surface finish without damage or overheating of the material. The use of a higher temperature allows for sharper and deeper embossings to be achieved, improving the visual appearance and haptic feel of the tissue paper. Moreover, the thermal treatment at these temperatures can reduce the need for additional chemical additives to improve embossing quality, making the final product more environmentally friendly and reducing production costs.According to one embodiment, it is provided that the tissue paper or the at least one first tissue ply comprises an average fines fraction of about 24% to about 26%, measured by a method according to ISO 10376:2011. In particular, a specific fiber length distribution is shown, which is influenced by the embossing process. In particular in an embossing process in which the embossing roll is brought to an elevated temperature, a modified fibre structure occurs in the tissue paper. The elevated temperature causes the cellulose fibers, in particular the shorter fibers, to break off or split less strongly. This results in a reduction in the proportion of very short fibers, which are typically classified as fines.In particular, during the thermal treatment, the fibers can be softer and more supple as a result of heating of the embossing roll, which increases the flexibility of the tissue paper and reduces the probability of fiber breaks during the embossing. The heat assists in relaxing the fiber bonds and reduces the mechanical stress on the short fibers, which could otherwise break up to an increased extent when embossing without heat treatment. This affects the fiber length distribution in the final product in favor of longer fibers, resulting in a more uniform structure and improved mechanical properties of the tissue.Advantageously, this procedure results in tissue paper with a lower proportion of very short fibers after the embossing process, which improves the strength and homogeneity of the final product. The reduction in the short fiber content contributes to the tissue paper being more resistant and at the same time being characterized by a smoother surface. This has positive effects on the haptics and durability of the tissue paper, since the longer fibers form a more stable and less porous structure. In addition, the reduction of the fraction of fines can reduce the formation of dust and lint during use of the tissue paper, which increases the suitability for use and the acceptance by the end user.In one configuration of the tissue paper, it is provided that the fines of the tissue paper or of the at least first tissue ply comprise a length of from about 6 μm to about 6.2 μm, measured by a method according to ISO 10376:2011. The forming process used in the production of tissue paper typically leads to a change in the fibre structure. In particular, the proportion of shorter fibers tends to increase during the forming process, since fibers can break in the process. Experimental results show that the proportion of short fibers can actually be higher during forming, in particular when using a heated embossing roll, than in processes without such a thermal pretreatment.Surprisingly, it has been found that despite the expected increase in shorter fibers, which would typically result in a reduction in strength, the strength of the tissue paper remains at a similar level or is even increased in the case of embossing with a heated embossing roll. This indicates that such a manufacturing process not only influences the length of the fibers, but also modifies the fiber bond and the structure of the tissue paper such that the mechanical properties, in particular the strength, are retained or improved. In particular, the sharper embossing can also advantageously lead to a consolidation of the tissue paper.The advantage of the proposed ratio of the embossing depth in the tissue paper to the embossing height of the corresponding embossing pin on the embossing roll is that the effective surface area is considerably increased by the defined depression, which leads to a clearly increased absorbency. At the same time, the embossing causes an increase in the volume of the fabric, as a result of which the bulk is optimized and a softer, textile haptics is established. In particular, a relief structure reduces local pressure peaks during touching, which further assists the sensation of softness. In addition, the targeted structuring improves the mechanical resistance to crack formation, since local strain zones are defined which increase the tear strength. A further advantage is the secure bonding of multilayer tissue plies: the embossed patterns promote the mechanical ply bonding effect and prevent detachment of the plies during use. At the production level, the optimized profile of the embossing rollers enables a reduction of vibrations and an increase of the line speed, whereby the efficiency is increased. At the same time, the uniform depth distribution ensures a loopless winding quality and a compact roll shape without log vibrations. Optically, hot stamped relief embossing results in an appealing design with high variability that conceals sheet inconsistencies. Haptically, the three-dimensional structure produced by the ratio enhances multisensory experience by imparting both grip and pleasing texture. From a sustainable point of view, tissue paper having such a ratio can be produced in the glue-free lamination process (adhesive-free lamination) and reduces the energy and maintenance expenditure, since adhesives are dispensed with and cleaning cycles are minimized. The elimination of chemical additives also improves the environmental profile and increases the process stability. The targeted embossing additionally prevents interleaving (anti-nesting) of layers in the roll, whereby blockages and subsequent damage are avoided. The control of embossing path and depth advantageously allows the accurate adaptation of mechanical properties in a point-to-point manner in order to achieve an optimum balance between strength and softness depending on the end use. Not least, the combination of relief, haptics and aesthetic feel achieved by the proposed ratio creates a premium character of tissue paper that differentiates the product in the competitive environment and generates a high multisensory multivalue.The advantage of a tissue paper or of the at least one first tissue ply having a length of the fines of from about 6 μm to about 6.2 μm is that increased short fiber formation can occur, but this does not lead to a reduction in the strength of the end product. Rather, the strength of the tissue paper remains stable or is even improved, indicating an optimized fiber structure and bond. This produces tissue paper which, despite a higher short fiber content, has robust mechanical properties, which leads to improved durability and performance in daily use. This property is particularly advantageous for the production of high-quality tissue products which require a high load-bearing capacity without any compromise having to be made in terms of softness or haptics.According to one embodiment of the tissue paper, it is provided that this comprises a basis weight of about 11 g / m 2 to about 25 g / m 2, preferably about 13 g / m 2 to about 22 g / m 2. The basis weight is a parameter in the production of tissue paper and influences both the mechanical properties of the tissue paper and its haptics and wear properties. A basis weight within the stated range ensures a balanced balance between strength, softness and absorbency, which is of decisive importance in particular for use in the hygiene sector. By adjusting the basis weight in a targeted manner, the specific requirements for the end product, such as the desired thickness and volume of the tissue plies, can be effectively fulfilled without adversely affecting the processability and the production costs.The advantage of a basis weight in the range mentioned is that the tissue paper offers an optimum combination of lightness and functionality. A basis weight of about 11 g / m 2 to 25 g / m 2 enables the production of tissue products which are both resource-saving and comfortable to use. In particular, in the preferred range of 13 g / m 2 to 22 g / m 2 an increased flexibility in product design is achieved, since the tissue paper is light enough to give a pleasant hand feel, but at the same time sufficiently robust to withstand the common loads. These properties make the tissue paper particularly suitable for use in high quality sanitary tissue products in which both comfort and efficiency are sought.According to one embodiment of the tissue paper, it is provided that it comprises a softness (softness) of about 80 dB to about 95 dB at a frequency of about 6,500 Hz, a smoothness / roughness (smoothness / roughness) of about 20 dB to about 50 dB at a frequency of about 200 Hz and / or a stiffness (strength) of about 0.5 μm / N to about 1.5 μm / N measured with a tissue softness analyzer (TSA) from the firm emetec Electronic GmbH of 2024.A test method for determining hand feel (HF) of tissue paper is realized by using a special device, the tissue softness analyzer (TSA). This device is designed to simulate the sensory abilities of the human hand and provide objectively measurable parameters that determine the haptic sensation when touching the tissue paper.The test method measures three basic parameters that are significantly responsible for the hand feel of tissue: softness, smoothness / roughness and stiffness.To determine tissue softness, the surface of the specimen is scanned with vertical blades mounted in a rotating disc. These blades simulate the papillary lines of human fingertips by sliding over the surface of the tissue, thereby producing characteristic vibrations. These vibrations are detected by a sensor and analyzed by means of a Fast Fourier Transformation (FFT). The softness value is represented by a second peak in the sound spectrum at about 6,500 Hz, which results from the interaction of the lamellae with the fine structures of the paper surface. The measured amplitude correlates directly with softness, with higher amplitude values indicating a higher microcompressibility and thus a softer surface.The smoothness / roughness of the paper surface is determined by analysis of the first peak values in the sound spectrum, which are at a frequency of about 200 to about 2,000 Hz. These values arise from the vibrations of the paper membrane caused by the sliding of the lamellae over the sample surface. The more pronounced the surface texture is due to factors such as embossing or creping, the higher the peak value, which indicates a rougher surface.The stiffness of the tissue is determined by a load test, in which a defined force is exerted on the paper sample. The resulting displacement of the paper membrane under load, measured in microns per Newton (μm / N), is recorded. This value correlates with the stiffness of the tissue, with greater displacement indicative of lower stiffness. The stiffness is influenced by both the elastic deformation of the sample and viscoelastic and plastic properties analyzed in a two-step load test.In one embodiment, it is provided that this has a Handfeel value (HF) of about 40 HF to 80 HF, measured with a tissue softness analyzer (TSA) from the firm emtec Electronic GmbH of 2024. Preferably, the hand file value for, for example, toilet paper is about 50 HF to about 80 HF, more preferably, the hand file value for, for example, kitchen paper is about 45 HF to about 55 HF.The ranges of values indicated for the hand feel parameters are defined in particular in such a way that they reflect the sensory properties of the tissue paper in relation to the human perception of softness, smoothness and stiffness. The aforementioned value ranges and preferred value ranges ensure that the end product meets the high requirements for comfort and user-friendliness, while at the same time ensuring high reproducibility and objectiveity in quality control.Softness, smoothness / roughness and rigidity were matched to one another in particular in such a way that the tissue paper is both haptically pleasant and has the necessary mechanical properties for daily use. Determining softness in the range of about 80 dB to about 95 dB at about 6,500 Hz guarantees a particularly soft surface that is perceived by users as comfortable and / or luxurious. The range of smoothness / roughness of about 20 dB to about 50 dB at about 200 Hz ensures that the surface of the tissue paper is sufficiently smooth to allow comfortable contact while still maintaining the necessary texture for effective cleaning or absorbency. The stiffness of the tissue paper in the range of about 0.5 μm / N to about 1.5 μm / N eventually ensures that the tissue paper is sufficiently flexible to avoid wrinkling and wrinkling, while still remaining stable enough to preserve its shape and functionality in use. Overall, these values advantageously result in a handle value of approximately 50 HF to 80 HF, which is determined from the above values by means of the TSA.The advantages of the defined parameter values lie in the optimum balance between comfort and functionality of the tissue paper. By precisely controlling these parameters, a tissue product can be produced which is not only soft and comfortable to touch, but also has the necessary physical properties to be reliable and efficient in use. These properties help to discern the final product as high quality and user friendly in both the private and commercial fields, ultimately increasing user satisfaction and market acceptance.In a further embodiment of the tissue paper, it is provided that this has a residual moisture content of about 1% to about 4.5%. The residual moisture content of the tissue paper is preferably in the range from about 2% to about 4%, more preferably in the range from about 2.5% to about 3.5%. The residual moisture is adjusted during the production process by careful control of the drying conditions and the subsequent storage process. Controlled residual moisture is decisive for the preservation of the desired mechanical properties and the haptics of the end product. If the residual moisture is too low, the tissue paper can become brittle and brittle, which adversely affects user-friendliness and durability. On the other hand, too high a residual moisture may lead to undesired deformation and reduced stability, in particular during storage and transport.By defining a preferred range of residual moisture between about 2% and 4%, it is ensured that the tissue paper has the optimum balance between flexibility and stability, whereby pleasant haptics and high strength of the tissue paper are achieved. In particular, a range of about 2.5% to about 3.5% is ideal to ensure sufficient suppleness without impairing the mechanical properties. These moisture levels help stabilize the fibrous structure of the tissue paper while maintaining some elasticity necessary to avoid wrinkling and cracking.The advantage of the defined residual moisture values is that they optimize the tissue paper with respect to both haptics and mechanical properties. Controlled residual moisture improves the flexibility and softness of the tissue paper, making it more comfortable for the end user. At the same time, the strength and durability of the tissue paper is increased, resulting in a longer useful life of the product and better user experience. Moreover, uniform residual moisture helps to maintain the quality of the tissue paper consistent throughout the production process, which lowers production costs and increases efficiency.In one configuration, it is provided that the embossing depth is produced by means of an embossing roller which comprises at least one embossing pin having an embossing height of about 300 μm to about 2100 μm, preferably about 700 μm to about 2100 μm, more preferably about 1000 μm to about 2000 μm.In an exemplary embodiment of the proposed tissue paper, an embossing roll equipped with a specific embossing pattern is used for producing a tissue ply. This embossing pattern comprises a plurality of embossing pins uniformly or non-uniformly distributed over the surface of the roll. An exemplary embossing pin within this embossing pattern has an embossing width at its tip of about 24 μm and an embossing height of about 1250 μm. In a further configuration of an exemplary embossing pin within this embossing pattern, the latter has an embossing width at its tip of approximately 24 μm and an embossing height of approximately 1250 μm, preferably an embossing height of approximately 300 μm to approximately 2100 μm, further preferably an embossing height of approximately 1200 μm to approximately 1250 μm, further preferably an embossing height of approximately 1200 μm. The embossing height is preferably selected in such a way that it ensures a significant but not too deep deformation of the tissue paper. The embossing pin is also exemplarily provided with a flank angle designed to allow an optimal balance between embossing force and embossing depth to produce the desired surface structure of the tissue paper.In one embodiment of the tissue paper, it is provided that it is produced with an embossing roll, wherein at least one first tissue layer comprises a first embossing with an embossing depth which is in relation to an embossing height of the embossing roll, wherein the ratio of embossing depth to embossing height is about 0.22 to about 0.8, preferably about 0.5 to about 0.8, more preferably about 0.7 to about 0.8. The person skilled in the art knows that the embossing depth of the tissue paper cannot be greater than the embossing height of the corresponding embossing pin on the embossing roll: V=T / H≤1, preferably V=T / H≈[0.22, 0.8].The tissue paper itself consists, by way of example, of one or more tissue plies, each tissue ply having a basis weight of about 15 g / m 2. These plies are embossed at a surface temperature of the embossing roll of about 100°C. The combination of the basis weight and the embossing parameter results in a defined embossing in the tissue paper, which has an embossing depth of about 324 μm or 730 μm. The resulting embossing height to embossing depth ratio is about 0.27. Preferably, the resulting exemplary embossing depth ratio of the embossing of the tissue paper to embossing height of the embossing pin on the embossing roll is about 0.27 or about 58 to about 0.6.The embossing height of the embossing pin on the embossing roll can be determined directly at the embossing roll or rolls.The following measurement methods can be used to determine the embossing depth in tissue paper: Cross sections for scanning electron microscopy (SEM) were prepared from each roll of tissue paper to prepare the measurement. The cross sections were scanned with an ion beam separator. Prior to ion deposition, the samples were sheared to the appropriate size for the ion separator. The depth of the embossment was determined by measuring the distance between the top and bottom of the sample. The accuracy of the distance generation at a point was checked 10 times and a value bandwidth of ±5 μm was determined. All samples were coated with carbon to improve the electrical conductivity. Images were taken at about 30 Pa chamber pressure which were digitally evaluated.In the context of a first exemplary measurement method by means of scanning electron microscopy (SEM), measurements of the embossing depth were carried out on different samples. Embossing depths of about 550 μm to about 900 μm, preferably of about 590 μm to about 870 μm, more preferably of about 520 μm to about 770 μm, more preferably of about 620 μm to about 690 μm resulted here for the first sample. This results in preferred ratios of embossing depth of the tissue paper to embossing height of the embossing pin on the embossing roll of about 0.46 to about 0.75, preferably about 0.49 to about 0.73, more preferably about 0.43 to about 0.64.Within the scope of a second exemplary measurement method by means of optical measurement by means of a laser scanning microscope (model keyence 3D of the model series VK-X3000), embossing depths of about 0.57 mm to about 0.82 mm, in particular about 815 μm, about 772 μm, about 717 μm, about 569 μm and about 749 μm were measured. Correspondingly, for example, ratios of embossing depth to embossing height are in a range from about 0.47 to about 0.68. The average value of the keyence measurements for the ratio of embossing depth to embossing height is preferably about 0.6.The different measurement methods show that the determination of the embossing depth has slight fluctuations depending on the method, which, however, are not of particular importance. These differences can be attributed in particular to different resolutions of the measurement methods and to sample preparation influences.To define the regions and sub-regions of the exemplary and preferred embodiments, measured values of the embossing depth relative to the embossing height were evaluated. By way of example, the embossing height of the embossing pins of the embossing roll used was about 1200 μm. Based on the measurement results, the following embodiments are obtained which have proven to be particularly advantageous: the ratio of the embossing depth to the embossing height, in particular the arithmetic mean of the measured ratios, is about 0.22 to about 0.80, preferably about 0.45 to about 0.68, more preferably about 0.55 to about 0.65, more preferably about 0.6.This differentiation allows for accurate determination of embossing depths and offers flexibility with respect to different manufacturing parameters and desired tissue characteristics, particularly when using a heated embossing roll.The exemplary tissue paper is characterized by specific mechanical and haptic properties. It has a softness of about 85 dB at a frequency of 6,500 Hz, as measured with a tissue softness analyzer (TSA). This softness is achieved by the fine surface texture and controlled embossing. Moreover, the smoothness / roughness of the tissue paper is about 30 dB at a frequency of about 200 Hz, indicating a balanced surface texture that is both comfortable to touch and provides sufficient functionality. The stiffness of the tissue paper is in a range of about 1.2 μm / N, which makes the tissue sufficiently flexible without losing dimensional stability. In addition, the tissue paper has a residual moisture of about 4%, which preserves the elasticity and structural integrity of the tissue paper after embossing.These specific technical features of tissue paper provide the desired structural and haptic properties required for high quality sanitary papers.Furthermore, a use of the above-described tissue paper for producing toilet paper is proposed. In addition, the tissue paper described can be used for producing facial tissues, paper handkerchiefs, kitchen rolls and napkins. Particularly in applications where softness, absorbency and tear strength are critical properties, such as toilet tissue, cosmetic tissue and / or baby wet tissue, the tissue paper provides excellent performance due to its optimized parameters. In industrial applications too, for example as wiping paper for sensitive surfaces or for cleaning in hygiene-sensitive areas, the tissue paper can be used, where a combination of high absorbency and gentle haptics is required.The advantage of using the described tissue paper is its versatility and adaptability to various requirements. Due to the specifically set parameters such as softness, smoothness / roughness, stiffness and residual moisture, the tissue paper offers an optimized user experience in different applications. It enables the production of end products which are both functional and comfortable and at the same time have a high durability. This leads not only to increased satisfaction by the end consumers, but also to a higher efficiency in production and a broader spectrum of use in various fields of hygiene and cleaning.Further advantageous embodiments are evident from the drawings below. The refinements shown there are not to be interpreted as limiting, however, rather the features described there can be combined with one another and with the features described above to form further refinements. Furthermore, it should be pointed out that the reference numerals indicated in the description of the figures do not limit the scope of protection of the present invention, but rather merely refer to the exemplary embodiments shown in the figures. Identical parts or parts with the same function have the same reference numerals below. The following are shown: FIG. 1 shows an embossing roller; FIG. 2 shows an embossed pattern; FIG. 3 is a sectional view of an embossing pin; and FIG. 4 is a view of an embossing;FIG. 1 shows an embossing roll 10 in a diagrammatic view. This has an embossed pattern 20, the detail II of which is shown schematically in FIG. 2. The embossing pattern 20 of the embossing roll 10 comprises a plurality of embossing pins, of which an embossing pin 22 is exemplarily designated.FIG. 3 shows the embossing pin 22 from FIG. 2 in a sectional view III-III. It can be seen that the embossing pin 22 has an embossing width 24 and an embossing height 26 of approximately 1200 μm. Furthermore, the embossing pin 22 of the embossing roller 10 has a flank angle 28.Figure 4 shows a view of a tissue ply 30 of tissue paper having an emboss 32. The emboss 32 embossed by the emboss pin 22 has an emboss depth of about 324 or 730 microns. This results in a ratio of embossing height to embossing depth or embossing depth of the tissue layer to embossing height of the embossing roll of about 0.27 or about 0.6.The tissue ply 30 of the tissue paper has a basis weight in the range of about 15 g / m 2, and has been embossed at a surface temperature of the embossing roll 10 in the range of about 100°C. The embossment 32 directly affects the softness, smoothness / roughness and stiffness of the tissue paper.The tissue paper has a softness of about 85 dB at a frequency of 6,500 Hz, as measured with the TSA. In addition, the smoothness / roughness of the tissue paper is about 30 dB at a frequency of 200 Hz, while the stiffness is in a range of about 1.2 μm / N. The tissue paper also exhibits a residual moisture content of about 4%. These technical features contribute to the structural and haptic nature of the final product, as illustrated by the illustrated embossment 32 on the tissue sheet 30.The advantage of the proposed tissue paper 30 is a good hand feel with a simultaneously lower basis weight.References included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedEP 1 226 310 B1

[0002] Cited Non-Patent LiteratureISO 10376:2011 [0028, 0031]

Claims

Tissue paper comprising at least two tissue plies, wherein at least a first tissue ply comprises a first embossment having an embossing depth that is related to an embossing height of an embossing roll with which the tissue paper is made, wherein the ratio of embossing height to embossing depth is about 0.22 to about 0.5.Tissue paper according to claim 1, characterized in that the at least one first tissue ply has been embossed at a surface temperature of at least the embossing roll at the embossing surface of about 60°C to 160°C.Tissue paper according to one or more of the preceding claims, characterized in that this or the at least one first tissue ply comprises an average fines fraction of about 24% to about 26%, measured by a method according to ISO 10376:2011.Tissue paper according to one or more of the preceding claims, characterized in that the fines of the tissue paper or of the at least first tissue layer comprise a length of about 6 μm to about 6.2 μm, measured by a method according to ISO 10376:2011.Tissue paper according to one or more of the preceding claims, characterized in that it comprises a basis weight of about 11 g / m 2 to about 25 g / m 2.Tissue paper according to one or more of the preceding claims, characterized in that it comprises a softness (softness) of about 80 dB to about 95 dB at a frequency of 6,500 Hz, a smoothness / roughness (smoothness / roughness) of about 20 dB to about 50 dB at a frequency of 200 Hz and / or a stiffness (strength) of about 0.5 μm / N to about 1.5 μm / N measured with a tissue softness analyzer (TSA) from the firm emetec Electronic GmbH of 2024.Tissue paper according to one or more of the preceding claims, characterized in that it has a Handfeel value (HF) of about 40 HF to 80 HF, measured with a Tissue Softness Analyzer (TSA) from the firm Emtec Electronic GmbH of 2024.Tissue paper according to one or more of the preceding claims, characterized in that it has a residual moisture content of from about 1% to about 4.5%.Tissue paper comprising at least two tissue plies, wherein at least a first tissue ply comprises a first embossment having an embossment depth of from about 550 μm to about 900 μm and a basis weight of from about 11 g / m 2 to about 25 g / m 2.Tissue paper according to claim 9, characterized in that the embossing depth is produced by means of an embossing roll comprising at least one embossing pin having an embossing height of about 300 μm to about 2100 μm.The tissue paper of claim 10, characterized in that the embossing depth is produced at a surface temperature of at least the embossing roll at an embossing surface of the tissue paper of from about 60°C to about 160°C.Tissue paper according to one or more of claims 9 to 11, produced with an embossing roll, characterized in that at least one first tissue layer comprises a first embossing with an embossing depth which is related to an embossing height of the embossing roll, wherein the ratio of embossing depth to embossing height is about 0.22 to about 0.8.Tissue paper comprising at least two tissue plies, wherein at least one first tissue ply comprises a first embossment having an embossing depth that is related to an embossing height of an embossing roll with which the tissue paper is made, wherein the ratio of embossing depth to embossing height is about 0.22 to about 0.8.

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