Sheet of toilet paper

Pattern description

The subject of the utility model is a sheet of toilet paper, in particular a sheet of toilet paper having essentially a basic rectangular shape with four edges, where each two of its edges are opposite in a parallel arrangement, and the corners are formed at the intersection of every two of the four edges that are not in parallel.

For the purposes of this formula, the term paper includes tissue as well as non-woven fabric.

Tissue paper is defined as soft, absorbent paper having a low basis weight. Generally, 22 weights from 8 to 30 g / m2 are selected², especially from 10 to 25 g / m2² per layer. The total weight of the multivar₂ tissue paper products are usually a maximum of 65 g / m2² or it can be a maximum of 2 3 3 not 50 g / m2². Its density is usually below 0.6 g / cm³, it may also be below 0.30 g / cm³3 and even between 0.08 and 0.20 g / cm3³.

Tissue making is distinguished by making paper by its extremely low basis weight and much higher tensile energy absorption coefficient (see DIN EN 12625-4 and DIN EN 12625-5). Paper and tissue paper generally differ in their elastic modulus, which characterizes the tensile properties of these flat products as a material parameter.

The high tensile energy absorption coefficient results from external or internal creping. The first is produced by squeezing the paper web adjacent to the dry cylinder as a result of the creping scraper or in the second case as a result of the difference in speed between the two screens ("fabrics"). This causes that the still moist, plastic deformable paper web is torn apart internally by compression and shear, which makes it more susceptible to stretching under load than non-creped paper.

Moist tissue webs are usually dried using so-called Yankee drying, direct air drying (TAD), or pulse drying.

The fibers contained in the tissue paper are mainly cellulose fibers, such as wood pulp fibers from chemical pulp (e.g. Kraft sulphate and sulphite pulp), mechanical pulp (e.g. mechanical wood pulp), thermomechanically crushed pulp, chemo-mechanically crushed pulp and / or chemically thermo-mechanically shredded pulp (CTMP). Fiber pulp from both hardwoods (hardwoods) and conifers (softwoods) can be used. The fibers may also be or include recycled fibers, which may include any or all of the categories listed above. The fibers can be treated with additives - such as fillers, softeners, such as quaternary ammonium compounds, and binders, such as conventional end-strength agents or wet-strength agents used to facilitate the primary production of paper or to regulate its properties. The tissue paper may also contain other types of fibers, e.g. regenerated cellulose fibers or synthetic fibers that increase, for example, the strength, absorbency, smoothness or softness of paper.

The tissue paper can be processed into a final tissue product in a number of ways, for example by extruding or laminating it into a multilayered product, rolling or folding.

On the contrary, the term nonwoven (ISO 9092, DIN EN 29092) is used for a wide range of products that, in terms of their properties, are located between the properties of paper (see DIN 6730, May 1996) and cardboard (DIN 6730) on one side and materials on the other hand. As for the nonwoven fabric, a large number of very different manufacturing processes are used, such as pneumatic and bonding techniques and wet-laying techniques. Nonwoven includes mats, nonwoven materials and finished products made of them. Nonwovens can also be called composite materials of the textile type, which are elastic porous materials that are not made by classical methods of weaving warp and weft or by means of creating eyelets. In fact, the nonwovens are produced by twin pairing, cohesive or adhesive bonding of the fibers or combinations thereof. The nonwoven material can be made of natural fibers such as cellulose or cotton, but can also consist of synthetic fibers such as polyethylene (PE), polypropylene (PP), polyurethane (PU), polyester, polyamide or regenerated cellulose. or from a mixture of different fibers. The fibers may be present, for example, in the form of endless fibers from prefabricated fibers of finite length, such as synthetic fibers produced in situ or in the form of staple fibers. The nonwovens which can be used in the solution according to the pattern can therefore be composed

PL 67 723 Y1 from a mixture of synthetic and cellulosic fibrous material, e.g. natural plant fibers (see ISO 9092, DIN EN 29092).

The toilet paper sheet of the present formula is preferably used in toilet and wiping products. The term nonwoven (ISO 9092, DIN EN 29092) is used for a wide range of products that, in terms of their properties, are located between the properties of paper (see DIN 6730, May 1996) and cardboard (DIN 6730) on one side, and textile materials from second page. As for the nonwoven fabric, a large number of very different manufacturing processes are used, such as pneumatic and bonding techniques and wet-laying techniques. Nonwoven includes mats, nonwoven materials and finished products made of them. Nonwovens can also be called composite materials of the textile type, which are elastic porous materials that are not made by classical methods of weaving warp and weft or by means of creating eyelets. In fact, the nonwovens are produced by twin pairing, cohesive or adhesive bonding of the fibers or a combination thereof. The nonwoven material can be formed from natural fibers such as cellulose fibers or cotton fibers, but can also consist of synthetic fibers such as polyethylene (PE), polypropylene (PP), polyurethane (PU), polyester, polyamide or regenerated cellulose or from a mixture of different fibers. The fibers may be present, for example, in the form of endless fibers from prefabricated fibers of finite length, such as synthetic fibers produced in situ or in the form of staple fibers. The nonwovens used in the solution according to the formula can therefore consist of a mixture of synthetic and cellulosic fibrous material, e.g. natural plant fibers (see ISO 9092, DIN EN 29092).

Sheets of toilet paper, such as handkerchiefs or facial tissues, kitchen towels and toilet paper having a basic rectangular shape are generally known in everyday life. More specifically, all known sheet products or webs of a plurality of interconnected sheets available on the market have a uniform, strictly rectangular shape.

The only features that are variable are edge embossing, color, and imprints, if any. In order to impart softness, conventional means of physical action are used, such as improving surface softness, softness when crumpled, thickness sensations, etc. In addition to these agents, optical features such as optimizing printing, mass dyeing, extrusion and screen patterns are introduced. The purpose of these measures is to improve the visual feeling of softness.

However, paper sheet products create the optical impression of a rigid flat cardboard-like structure without any flexibility. In addition, the overall appearance of the paper sheet product is not encouraging.

As mentioned above, the state of the art suggests, e.g. for wipes, embossing the edges to improve the visual appearance and achieve bonding of layers. This edge extrusion is used in a processing machine, e.g. according to a modified nesting method in which the embossing rollers of the steel roll enter into the cavities between the press roll extruding rolls. This creates press contact on the top surfaces of the press with the base of the press roll (double soft extrusion DSE). For example, in the case of double soft extrusion, the extrusion nap is carried out on a steel surface, which can cause significant vibration and clear corrugation marks due to the lateral positioning of the extrusion frames relative to the machine direction on the extrusion roller.

From JP-A-06133894, many interconnected toilet paper sheets are known, each sheet having a substantially rectangular basic shape with four edges. The intersection of two edges forms a corner, and at least two edges have a wave shape between the corners formed by the intersection of the corresponding one of at least two edges with the corresponding remaining edge. At least two opposite edges and the shape of one of the opposite edges is the same as the shape of the other of the opposite edges.

The purpose of this utility model is to develop a toilet paper sheet having an improved appearance compared to the state of the art, especially with regard to its visual softness and its visual attractiveness while maintaining the desired performance properties, such as absorption capacity, etc.

A toilet paper sheet having a rectangular shape with four edges, the intersection of two edges forming a corner, according to the pattern is characterized by at least two

EN 67 723 Y1 from the edges have a wave shape between the corners formed by the intersection of the respective one of these at least two edges with the corresponding second edge, the at least two edges being opposite to each other and the shape of one of the opposite edges being complementary to the shape of the other opposite edges.

At least one edge of these at least two edges is shaped so that the corner in at least one of the corners is removed.

In addition, the corner is rounded.

The corner can also be cut at an angle. The bevel is located at an angle of about 135 ° to each of the edges connected to the bevel.

In particular, the technical problem is solved by means of a toilet paper sheet having essentially a basic rectangular shape with four edges, the intersection of two edges forming a corner and at least one edge being formed in a non-straight manner in the area defined between the two corners, and each of the two corners is formed by cutting together at least one edge with the corresponding other edge. For the purposes of this template, the phrase 'essentially having a basic rectangular shape should be understood to mean only the basic shape: a sheet of paper, not the actual shape. This means that the edges do not have to be straight and the corners can be bent, so that the uniform basic shape of the rectangle is distorted and present only virtually.

In the event that at least one edge is formed in a non-straight manner in the area defined between two corners, the strictly rectangular shape known from prior art products is distorted to improve the appearance of the paper sheet in terms of its visual softness and attractiveness. In particular, since the sharp edges have been removed, it looks softer and more attractive than sheets having a uniform rectangular shape. In addition, in the case of, for example, double soft extrusion, vibration and clear notching marks can be reduced.

In the present solution, at least one corner located at one of the corners can be removed. In the recommended shape, the corner is rounded. Alternatively, the corner may also be bevelled, the bevel being located at an angle of about 135 ° to each edge connected to the bevel. In this context, the angle is formed by a chamfer on one side and a virtual edge of a substantially rectangular basic shape intersecting with a bevel.

In addition, at least one edge of the toilet paper sheet may be curved in the area between two corners, the at least one edge may also be arc-shaped.

One edge of the toilet paper sheet can also be shaped in a zigzag pattern in the area between two corners.

At least two opposing edges are formed in a non-straight manner. In this context, the shape of the opposite edges is complementary.

The toilet paper sheets described above are joined together to form a paper web.

The sheets of toilet paper can be connected to each other by means of perforations, the perforations being formed in a non-straight manner in the area between two corners. The opposite edges of the toilet paper sheets joined to the edges formed by the perforations are straight in the area between the two corners, each of the two corners being formed by the intersection of one of the two opposite edges with one of the edges formed by the perforations. As a result, when the paper web is rolled to form a cylindrical roll, the top and bottom of the roll remain flat due to straight edges, improving the ability to stack and place the rollers. At the same time, when the user tears a single sheet of toilet paper, this sheet has the advantages of this formula.

The subject of the pattern is shown in the drawing, in which Fig. 1 is a toilet paper sheet with bevelled corners, Fig. 2 is a toilet paper sheet with wave-shaped edges, Fig. 3 is a toilet paper sheet with zigzag-shaped edges, Fig. 4 is a sheet toilet paper according to the present pattern in which two opposite edges have a wave shape and are complementary to each other, Fig. 5 and Fig. 6 show a way in which a toilet paper sheet can be produced according to the present formula, and Fig. 7 shows an alternative of the method shown in Fig. 6.

Fig. 1 shows a toilet paper sheet 1 with bevelled corners. The paper sheet 1 has essentially a basic rectangular shape indicated by a dashed line. The basic rectangular shape has four edges 2a, 2b, 2c, 2d, with each two edges 2a, 2b; 2b 2c; 2c, 2d; 2d, 2a form the corners 3a, 3b, 3c, 3d at intersections. Each two adjacent corners 3a, 3b, 3c, 3d define the area A between them, as shown in Fig. 1 only for corners 3b and 3c (in the following text reference is made only to this edge, although the other edges are shaped in the same way). The edge 2c extending between two adjacent corners 3b, 3c and thus situated in area A is not shaped in a straight way, i.e. the corners 3b, 3c are not directly connected to each other by means of a straight edge or line, respectively. Corners typically formed by joining two edges (i.e. corners formed at the corners by a dashed line) are removed so that the edge passing between the corners is obliquely cut before it actually reaches the corners 3b and 3c respectively. In the sheet shown, all four corners are removed, i.e. all four edges 2a, 2b, 2c, 2d are bevelled before they reach the corresponding corners 3a, 3b, 3c, 3d. The angle Θ between the bevel 4a, 4b, 4c, 4d and the corresponding edge 2a, 2b, 2c, 2d to which the bevel is connected is 135 °. However, both the angle between bevel 4a, 4b, 4b, 4c, 4d and one edge 2a, 2b, 2c, 2d with which the bevel is connected and the angle between bevel 4a, 4b, 4c, 4d and the other edge 2a, 2b, 2c , 2d, to which the bevel is connected may also be different.

Fig. 2 shows toilet paper sheet 1 with folded edges. It can be stated that the toilet paper sheet 1 does not have to be symmetrical. In the example shown, one edge 2c of the four edges 2a, 2b, 2c, 2d is shaped simply in the area defined between the two corners 3b and 3c. However, the other three edges 2a, 2b, 2d are formed in the area defined between two adjacent corners 3c, 3d; 3d, 3a; 3a, 3b not in a simple way. Thus, two opposite edges 2b, 2d are curved. In particular, these two edges 2b, 2d are wave-shaped. Furthermore, the corners formed between two opposite edges 2b, 2d and one edge 2a among the other two edges 2a, 2c are removed, namely they are rounded. As a consequence, also the third edge 2a is formed in a non-straight manner between two adjacent corners 3d, 3a, because the edge 2a does not run completely between the two corners 3d, 3a. More specifically, the part at which the edge 2a is arcuate (close to the corners 3d, 3a) does not correspond to the visual edge of the substantially rectangular basic shape indicated by the dashed line.

In Fig. 3, two opposite edges 2a, 2c are shaped in a zigzag pattern, while other opposite edges 2b, 2d are beveled near the fictitious corners 3a, 3b, 3c, 3d. In Fig. 4, a toilet paper sheet according to the present pattern is shown. The toilet paper sheet 1 has two opposite edges 2a, 2c formed in the form of a wave. It is apparent that these waveforms are complementary. This is best achieved by producing toilet paper sheet 1 from the web, the opposite edges being transverse to the machine direction (MD) in which the paper web is moved. In particular, the paper web is cut transversely to the machine direction so that at the same time the same but complementary cut is formed on two opposite edges of two consecutive paper sheets 1 of the paper web. The production method is described in more detail below.

When at least two opposite edges are formed in a non-straight manner, i.e. straight lines of a substantially rectangular basic shape are disturbed, the toilet paper sheet 1 acquires a visual appearance giving the impression of a depth similar to that of a soft textile material. In addition to the cut formed, the toilet paper sheet 1 may be embossed or printed as is known in the art. In addition, edge embossing in the area between two corners in which the edge is formed in a non-straight manner may have different widths to increase the perspective depth impression.

Cutting on at least one edge in a non-simple manner can technically be accomplished using the so-called laser cutting technique described below. A similar method is also known from EP 1 305 132. In contrast, most cutting devices known to date are only suitable for making straight cuts.

The method for producing toilet paper sheets according to the present formula will be described below.

Fig. 5 schematically shows a device for cutting the edges of a paper web in the longitudinal direction, i.e. parallel to the machine direction (MD). In such a device, the paper web runs at high speed in the machine direction (MD). At a later stage, the web is cut into multiple sheets of 1 toilet paper or perforated and rolled up to provide the web

PL 67 723 Y1 toilet paper formed of many sheets of 1 toilet paper joined together by means of perforations. The laser source 7 is located above one or both longitudinal edges 2a, 2c (with reference to Figures 1 to 4 the edges 2b, 2d) of the paper web may also be indicated. The laser source 7 is movable, such that the laser beam 6 moves transversely to the web direction, and cuts the edge 2a with a pattern, e.g. a wave pattern 5, as shown in Fig. 5, thus the longitudinal edge 2a or both longitudinal edges 2a, 2c of the paper web are cut in a wave pattern.

Fig. 6 shows both a method and a device that allows complete cross-cutting through the web transversely to the machine direction. In fact, such a device makes it possible to provide some kind of laser curtain over the entire web of paper so as to allow transverse cutting or transverse perforation. Such a laser curtain can be obtained in many ways.

Firstly, a certain number of laser sources can be set in a parallel manner, the lasers preferably being arranged to form a non-straight edge pattern 2b. In other words, the laser source 7 is formed by many individual laser sources arranged in a row, which are regulated by one common element.

Another possibility may be a row of laser sources 7, which are regulated by means of mirrors 8. In this context, mirrors 8 should oscillate at the same frequency so that a specific area can be energized by different laser beams. If a continuous paper web consisting of a plurality of interconnected toilet paper sheets 1 is to be made, a plurality of cuts are made, a point-in-place, on the paper web to form perforations. Perforation can be formed in a non-straight manner, while the longitudinal edges of the paper web remain essentially straight. In this way, if the toilet paper web is distributed in the form of rolls, the straight longitudinal edges essentially form a flat bottom and top of the cylindrical roll, while the perforated edges do not simply improve the visual appearance and softness. If a complete cut is to be made, the laser activation areas 9 overlap, as shown in Fig. 7. Alternatively to the manufacturing method described above, the oscillating mirrors may be mirrors arranged in a row, which should be so close together that a perforated cut is formed. In this context, the mirrors are semi-permeable, so as to deflect only part of the energy of the laser beam, so that the rest of the energy can be used by subsequent mirrors.