EP3143893B1 - Insole - Google Patents

Description

The invention relates to an insole for shoes with a base material which has a sole surface facing the shoe and an opposite foot surface facing the foot, a coating being applied to the sole surface which gives the sole surface of the insole an increased frictional force compared to the uncoated sole surface, the coating consisting of a There is a multitude of coating lines.

From the WO 01/72 414 A2 such a coating is known, which on the one hand should have a high coefficient of friction and on the other hand a small adhesive force in order to prevent the shoe sole from slipping, but at the same time to allow easy removal of the insole. Are preferred lattice-shaped or strip-shaped patterns as well as individual island-shaped full-surface patterns on the sole surface of the insole.

Furthermore, it is from the EP 1 524 925 A1 previously known, in the case of a disposable insole, on the underside of the insole facing away from the foot surface and facing the insole of a shoe, very fine, spaced-apart island-shaped knobs made from natural or synthetic rubber, from aqueous acrylate-based dispersions or from an acrylate / Latex mixture or from polyurethane or from polyurethane-acrylate mixtures or from nitrile latex and in particular also stand out in color from the shoe sole. This is intended to form a slip prevention means for the insole.

Another shoe insole is from the US 2002/0066209 A1 known, wherein a plurality of strip patterns is shown here, which extend from one side to the other or from one edge to the other of the sole surface and can be either continuous or interrupted. The linear patterns can consist of both straight and curved lines. Alternatively, an anti-slip coating provided in the form of a random wire structure is known from the document.

Based on these known coatings, it is the object of the present invention to provide an insole for shoes which provides an anti-slip effect in the desired manner, at the same time has sufficient flexural rigidity, while at the same time largely preserving the basic material of the insole own and desired properties, such as air permeability and / or breathability.

The object is achieved by an insole for shoes with the features of claim 1, wherein the coating is formed from a plurality of individual patterns formed by coating lines, which are discrete from one another and are arranged so that they are not continuously from a first one or more Side of the sole surface to an opposite second side of the sole surface extending continuous coating line can be formed.

Individual patterns are to be understood as meaning patterns that are designed as open or closed patterns. Open patterns are those patterns in which the beginning of the line has no contact with the end of the line, and closed patterns are those in which the beginning and end of a line can no longer be determined because they are connected to one another. In addition, only those patterns should be individual patterns according to the invention that cannot be reduced to a simple point or a simple straight line. This means that an individual pattern must be more than one point, and when a pattern is designed as a line, the line must not only extend as a straight line in only one vector direction, but rather this pattern of lines has at least one curvature and / or at least one kink got to.

This ensures that the coating lines do not only run in a preferred direction.

Individual patterns that are discrete from one another are those that are either completely separated from one another, or else Individual patterns which, however, can also touch, intersect and / or overlap. In spite of tangling, cutting or overlapping, the individual pattern can nevertheless be recognized as an individual pattern from its two-dimensional extension circumscribed by the direction specified by the coating line. Individual patterns are also understood to mean pattern groups which are composed in particular of at least two identical and / or different pattern elements. In particular, arrangements are understood as pattern groups in which at least two pattern elements are arranged side by side and in contact, or in particular also pattern groups in which one pattern element at least partially surrounds or runs around another pattern element, such as concentric arrangements, in particular on circles, ovals, Triangles or other polygons or geometric figures of any kind lying one inside the other that touch at a point.

It goes without saying that the individual patterns formed from coating lines are at least partially, preferably completely surrounded by an uncoated area and / or also include an uncoated area, and at least partially, preferably completely, surround this uncoated area.

It goes without saying that the coating of the sole surface of the insole consists exclusively of coating lines and that there is no full-surface coating of the sole surface in the sense of a continuous, area-wide, uninterrupted application.
The individual patterns are achieved by linear coatings, whereby a line is to be understood as an element in which a line width of at least 0.2 mm and the line has a length that is at least 5 times the line width.

The linear coatings of an individual pattern can in principle have both straight lines and curved lines, as well as corresponding intersecting lines. The lines can basically be designed both continuously and interrupted, provided that the line remains clearly recognizable as such. That is to say, dashed, dash-dotted or dotted coating lines are also conceivable for the purposes of the present invention. In particular, the interrupted points must not be longer than 10 times, in particular no longer than 8 times, in particular no longer than 6 times, in particular no longer than 4 times the line width of the line adjacent to this interrupted point.

Sides of the sole surface are understood to mean all edges or edges of the same.

According to a particularly preferred embodiment it can be provided that at least one individual pattern is designed in such a way that a section of this individual pattern runs perpendicular thereto for each direction running in the sole surface or, in the case of a curved sole, for each tangential direction to the sole. This means that for every possible direction in the sole surface, provided the sole lies flat, there is a section or area in the individual pattern which runs perpendicular thereto. By designing the linear coating with a curvature, a better distribution of the forces in different directions can be achieved. In this way, particularly good slip resistance can be achieved. According to a further preferred embodiment, the Section be point-shaped, with an imaginary tangent applied at this point always running perpendicular to a direction in the shoe sole.

Particularly preferably at least 20%, in particular at least 40%, in particular at least 50%, in particular at least 60%, in particular at least 80%, in particular 100% of the individual patterns have at least one section that runs perpendicular to any direction of the sole surface. In particular, in at least 20%, in particular at least 40%, in particular at least 50%, in particular at least 60%, in particular at least 80%, in particular 100% of the individual patterns, this at least one section is punctiform and an imaginary tangent applied to it runs perpendicular to any direction in the sole surface.

The individual patterns provided on the sole side can have the same or different geometric shapes and in particular be designed in the same and / or different dimensions / dimensions.

In addition, at least one individual pattern can preferably be formed as a pattern group which comprises at least two pattern elements formed from coating lines. At least 20%, in particular at least 40%, in particular at least 50%, in particular at least 60%, in particular at least 80% of the individual patterns are particularly preferably formed from a pattern group. Furthermore, in particular, each individual pattern is made up of a plurality of pattern elements. The pattern group can, for example, be composed of inner and outer pattern elements and / or pattern elements that join together to form an overall pattern or further pattern elements that are, for example, next to one another and thereby Are arranged touching, be constructed. It can particularly preferably be provided that a pattern element of an individual pattern surrounds a second pattern element at least in some areas, but in particular completely. Circumferential should also be understood to mean that the lines at least partially touch one another or are designed to run concurrently with one another. Such patterns can be arranged particularly ergonomically.

It can be provided in particular that the individual patterns are surrounded by an uncoated outer area which has a geometric shape different from the geometric shape of the individual patterns. In particular, this is also intended to ensure that, unlike, for example, lattice patterns and stripe patterns, there are no preferred directions, but slip resistance can be provided equally well on all sides.

It is particularly preferred that at least one individual pattern is enclosed on all sides by an uncoated outer area. It is particularly preferred that a large number of individual patterns per insole, which are applied to the sole surface, are surrounded on all sides by an uncoated outer area. Particularly preferably, all individual patterns per insole are surrounded by an uncoated outer area. In this way it can be achieved that, on the one hand, the linear, instead of the previously known point-shaped coatings, the flexural rigidity of an insole can be increased, whereby easier insertion into the sole is achieved, but also a higher stability of the insole is achieved under load , for example in a sports shoe, like the insole through the sliding movement of the foot in the shoe must include. On the other hand, it is achieved at the same time that, in contrast to a full-surface coating application, the desired properties of the base material of the insole, such as air permeability and / or breathability of the insole, can be kept high

Such soles with a linear coating in the form of individual patterns represent a good compromise in terms of flexural rigidity, air permeability and / or breathability while at the same time being ergonomically adapted to the foot of a wearer or to the surface contours of the shoe.

Depending on the desired pattern and depending on the desired setting of the anti-slip properties, provision can be made for the large number of individual patterns to be applied in a regular repeat or not to be arranged regularly.

In particular, it is provided that the large number of individual patterns cover the sole surface essentially in its entire extent, that is to say not just special areas such as the heel and / or ball of the foot. It is therefore preferably provided that the individual patterns extend over the entire sole surface, whereby, depending on the intended pattern, individual areas of the sole surface, such as the ball area and / or heel area, can have an increased pattern density and other areas, such as the arch area, a lower one May have pattern density. It is also conceivable, depending on the area of the sole surface, to select different individual patterns or to vary the pattern size. In addition, it is also conceivable, for example in the area of the ball of the foot and / or the heel, to design the patterns in such a way that the patterns intersect and / or intersect one another overlap and / or touch one another, whereas in the remaining area the patterns have a lesser degree of overlap or fewer points of intersection or fewer points of contact with other patterns and in the borderline case are even arranged separately from one another in the remaining areas.

Particularly preferably, the sole surface can have a degree of coverage by the coating lines of at least 6%, in particular at least 8%, in particular at least 10%, further in particular at least 20% and in particular at most 50%, further in particular at most 40% and further in particular at most 30%. In this way, a good flexural rigidity of the insole is achieved and the desired properties of the base material, such as air permeability and breathability, are not changed too much, but are retained.

If the individual patterns are considered in total, they preferably have an area proportion of at least 20%, in particular at least 30% and further in particular at least 40% and in particular at most 80%, further in particular at most 70% and further in particular at most 60% of the sole surface. The area of an individual pattern is understood here to be the area enclosed by the outer coating lines (including the coating lines), so the inner uncoated areas of the individual pattern or, in the execution as a pattern group, of the associated areas of the individual pattern elements are also taken into account. Sufficient anti-slip properties can be achieved via the surfaces covered by the individual patterns while still having sufficient flexural rigidity and while maintaining the properties inherent in the base material, such as air permeability and breathability.

An individual pattern preferably has an area with an extension distance between the outer coating lines of at least 0.3 cm, preferably at least 0.5 cm, more preferably at least 0.7 cm, more preferably at least 1.0 cm, more preferably at least 1.5 cm , more preferably at least 2 cm, more preferably at most 5 cm, more preferably at most 4 cm, more preferably at most 3 cm. As the extension distance, the z. B. can be a diameter, the distance between the respective distal distal distant coating lines that describe or delimit an individual pattern is understood. The outer edge of the coating line, including its line width, is measured.

An individual pattern, including the circumscribing coating lines, preferably has an area of at least 0.2 cm ² , more preferably of at least 0.5 cm ² , more preferably of at least 1.0 cm ² , more preferably of at least 1.5 cm ² , more preferably of at most 10.0 cm ² , more preferably of at most 8.0 cm ² , more preferably of at most 6.0 cm ² .

The individual patterns can be designed differently or identically with regard to their geometric shape and / or their dimensions. The various properties of the insole such as the degree of coverage, anti-slip properties, flexural rigidity, air permeability, breathability can be taken into account and implemented by setting the individual patterns.

Individual patterns with curved or rounded areas are particularly preferred, since these allow better ergonomic adaptation.

The line width can be at least 0.2 mm, in particular at least 0.4 mm, in particular at least 0.5 mm and further in particular at least 0.6 mm. The line width should preferably be no more than 2 mm, further in particular no more than 1.6 mm, further in particular no more than 1.2 mm, further in particular no more than 1.0 mm. The line length in relation to the line width should be at least 5 times, preferably at least 6 times, more preferably at least 8 times and more preferably at least 10 times the line width.

The height of the coating lines should be at least 0.1 mm, in particular at least 0.2 mm. The height of the coating line should be at most 0.8 mm, further in particular at most 0.6 mm and further in particular at most 0.4 mm. The measurement of the height can be determined with a microscope with a corresponding magnification, namely as the difference between an averaged upper edge of the base material and the upper edge of the coating line.

With these preferred heights of the coating lines, haptic effects that are unpleasant to the touch are advantageously avoided on the foot.

The weight per unit area of the coating can be at least 5 g / m ² , in particular at least 10 g / m ² , further in particular at least 15 g / m ² and further in particular at least 20 g / m ² . The area weight should go up preferably be limited to 50 g / m ² and more particularly to a maximum of 30 g / m ² .

The coating is in particular polymer-based and in particular based on a polymer taken from the group comprising PE (polyethylene), PP (polypropylene), APAO (amorphous polyalphaolefins), EVA (ethylene vinyl acetate), EVAC (ethylene vinyl acetate copolymers), PA (polyamides), TPE -O (thermoplastic elastomers based on olefin), TPE-V (crosslinked thermoplastic elastomers based on olefin), TPE-E (thermoplastic copolyester), TPE-U (thermoplastic elastomers based on urethane), TPE-A (thermoplastic copolyamides, e.g. PEBA), TPE -S (thermoplastic styrene block copolymers), such as HSBC (hydrogenated styrene block copolymers), SEBS (styrene-ethylene-butadiene-styrene polymers), SBS (styrene-butadiene-styrene), SEPS (styrene-ethylene-propylene-styrene) ) or a combination of one or more of the polymers mentioned hereof.

Materials with a Shore A hardness of at least 30, in particular of at least 40, in particular of at least 50, further in particular at least 60 and in particular at most 90, further in particular at most 80, further in particular at most 70, are preferred as materials for the coating . The Shore A hardness is a material parameter for elastomers and plastics. The Shore A hardness is determined using the following method.

Method for determining the Shore A hardness:

The Shore A hardness is a measure of the resistance of a material to the penetration of a body of a certain shape and under a defined spring force. Thereby gives the Shore hardness units, the value 0 indicates the lowest and the value 100 the greatest hardness.

The measurement is based on the standards DIN 53505: 2000-08 and ISO 868: 2003 (E). A Shore A hardness tester is used. Such a Shore A hardness tester, which is shown schematically in Figure 5 is shown with the reference numeral 60, uses a spring-loaded indenter with the geometry of a truncated cone. The indenter 62 made of steel has a diameter D1 of 1.25 ± 0.15 mm, which is in a lower truncated cone with a lower surface with a diameter D2 of 0.79 ± 0.01 mm with an angle of inclination W of 35 ° ± 0 , 25 ° opens. The distance C between the lower edge of a pressure foot 64 and the lower surface of the indenter is 2.5 ± 0.02 mm. The indenter is introduced centered within the pressure foot 64 with a recess with a diameter D3 of 3 ± 0.5 mm.

The test should be carried out on test specimens that have not been mechanically stressed. For the test, the test specimen should be fully polymerized or vulcanized for 16 hours. The test is carried out under standard conditions at 23 ± 2 ° C and 50 ± 2% humidity. The specimens and the devices are conditioned accordingly for at least 1 hour.

The test specimens need dimensions that allow measurements at least 12 mm from each edge and have a sufficiently plane-parallel support surface so that the pressure foot can touch the test specimen on a surface with a radius of at least 6 mm around the tip of the indenter. Specimens with a material thickness of at least 4 mm are required. At With small thicknesses, the specimens can be composed of several thinner layers. At least 5 different points are measured on each specimen, the distance from the edges of the specimen being at least 12 mm. The distance between the measuring points should be at least 6 mm. The pressing weight of the indenter is 1 kg.

The measuring time is 3 seconds, i.e. the hardness is read 3 seconds after the contact surface of the test device and the test specimen touch.

The coating lines are preferably applied by means of a roller which has an engraving corresponding to the pattern (sum of the individual patterns).

The sole side with the coating can have a dynamic coefficient of friction measured in accordance with ASTM D 1894-01 of at least 0.6, in particular at least 0.8 and further in particular at least 1.0, with maximum values of at most 2.0, further in particular at most 1 .5 and more particularly a maximum of 1.2 should be achieved This creates sufficient frictional forces, but on the other hand ensures that the insole can be removed easily.

Test to determine the dynamic coefficient of sliding friction:

In the present case, the slip behavior of insoles according to the invention with a coating is to be determined. Here, the sole surface of the insole provided with the coating is drawn against a standardized surface. The sliding friction force A occurring here should be measured and then the dynamic one from this The coefficient of sliding friction can be determined. The test method is based on ASTM D 1894-01 for determining the friction behavior of plastic films.

The test specimens must be conditioned for at least 2 hours in a standard climate at 23 ° C ± 2 ° C and 50% ± 2% humidity. The samples must not be kinked, folded or scratched; other changes and contamination are to be avoided. The same applies to the steel test plate. The test procedure must also be carried out under standard conditions (23 ° C ± 2 ° C, 50% ± 2%).

A test specimen measuring 50 × 50 mm is punched out of the insole with a coating or from a corresponding roll product and is attached to a friction block without creases. In the case of the roll goods, however, it is exactly that material from which the insoles according to the invention are punched out.

The friction block has a base area of 63 mm × 63 mm edge length, i.e. a contact base area of 40 cm ² and a mass of 200 g ± 5 g. It is attached to the load cell of a tensile testing machine according to DIN 51 221 class 1 using a thread (without intrinsic elongation). One such tensile testing machine is the Zwick Roell type Z010 testing device from Zwick GmbH & Co. KG, 89079 Ulm, Germany.

The additional device consisting of the sample table and friction block according to DIN EN ISO 8295: 2014 is also offered by Zwick. The friction block with the specimen is carefully placed on a defined material, a smoothly polished steel plate (DIN EN 1939: 2003-12). The experiment is started 15 seconds after the friction block has been placed. The test speed is 150 mm / min, both for the actual measuring path of 130 mm and for the pre- and post-measurement travel of 10 mm each. To determine the dynamic coefficient of sliding friction µ, only the force curve of the measuring path of 130 mm is used. The test is carried out for at least five specimens. A mean value x and the standard deviation s are given, rounded to two decimal places. The dynamic coefficient of sliding friction results from the quotient of the sliding friction force A determined in this way, expressed in grams (g) by the force of 200 g exerted by the friction block.

In addition, the insole should have a preferred flexural strength of at least 500 mN, in particular at least 600 mN, further in particular at least 700 mN, further in particular at most 3000 mN, further in particular at most 2000 mN.

The insole can have increased flexural rigidity compared to an insole without coating lines on the sole surface, the flexural rigidity in particular being increased by 5%, further in particular by 10%, further in particular by 15%. However, the flexural rigidity should preferably be increased by a maximum of 50%, further in particular by a maximum of 40% and further in particular by a maximum of 30% by the coating lines of the individual samples. The bending stiffness is determined with the following test:

Test to determine the bending stiffness

To determine the restoring force, i.e. the inherent stability of insoles according to the invention, the bending stiffness of 10 samples is determined using a commercially available device to determine the bending stiffness (at 23 ° C ± 2 ° C and 50% ± 2% Humidity). Device type 58963.013 from Karl Frank GmbH, Weinheim-Birkenau, DE, was used for the current measurement. Any similar device can also be used, whereby the basic setting of the device (bending length, force arm, bending angle, angular rotation speed) and the defined specimen must be observed. In each case 10 samples of the insole were measured. A bending angle of 30 ° and a bending length of 10 mm were used. The overhang for placing the measuring sensor is 6 mm within the edge area of test specimen 37 (see Figure 4b and 4d ). The device 30 used for measuring the bending stiffness is in the Figures 4a to 4d shown schematically. An angular speed of rotation of 6 ° / sec was also required for the measurement. set. A test body with the dimensions 40 mm × 40 mm was defined as the test body. In the case of products with larger dimensions, the correspondingly defined specimen was punched out.
The device 30 used for the flexural rigidity measurement comprises a specimen holder 32 with a clamping clamp 34 and a knurled screw 36, which enables the two clamping plates 34a and 34b to come together for fastening the specimen 37. The clamping clamp 34 is attached to a disk-shaped plate 38, whereby this plate 38 rotates clockwise according to the entered bending angle (here 30 °) by device-internal function control when performing the measurement. The angular speed of rotation of the plate 38 is 6 ° / sec. The selection of the bending angle can be determined on a further device area 40 and adjusted by means of a knurled screw 42. The actual measuring device 44 comprises a measuring cell 46. The forces picked up by a measuring sensor 48 are converted into a The measured force value is converted and ultimately displayed as a measured value on a display 50. The measuring sensor 48 is designed in this device in the form of a vertically standing cutting edge. The already mentioned bending length L (that is, the length of the force arm) can be adjusted by adjusting the measuring device 44 via a knurled screw 52 in the direction of the arrow 53. The bending length L is to be understood as the length of the area which is located between the measuring sensor and the closest edge of the clamping clamp 34 and which forms the force arm; the bending length L is 10 mm.

To carry out the experiment, the square specimen 37 (see Figure 4d ) fixed between the clamping plates 34a, b of the clamping clamp 34 in the specimen holder 32. The clamping clamp 34 and its clamping plates 34 a, b here have a width of 2.4 cm and a length of 4.0 cm. The sample body 37 is clamped with the upper side having the coating in the direction of the measuring sensor. Before the start of the experiment, the cutting edge of the measuring probe is also brought up to the point where the sample touches the other end area of the specimen and adjusted so that the specimen just touches the cutting edge of the measuring probe. An overhang 55 of the specimen 37 over the cutting edge of the measuring sensor is approx. 6 mm (see FIG Figure 4d ). When the measurement is carried out, the plate 38 rotates with the clamping clamp 34 clockwise up to the specified bending angle, which then leads to a deformation of the specimen. The specimen is bent against the measuring cell. The forces caused by the deformation are converted into readable measurement data and displayed on the display 50.

The insole can be designed in one or more layers with respect to the base material, and in particular a Include nonwoven material. The nonwoven materials preferably comprise natural cellulose-based fibers or synthetic fibers or mixtures thereof.

The base material, especially in the case of multi-layer base material, has a base layer with a weight per unit area of preferably at least 180 g / m ² , more preferably at least 200 g / m ² , more preferably at least 220 g / m ² , more preferably at most 300 g / m ² , more preferably at most 280 g / m ² , more preferably at most 250 g / m ² .

The thickness of the insole, including the coating on the sole surface, is preferably 1-3 mm, preferably 1-2 mm.

The thickness of an insole (including the coating) is determined using a specific measuring pressure of 0.5 kPa on a feeler area of 25 cm ² . In particular, a DMT thickness measuring device from Schröder can be used. Otherwise, the thickness is determined based on DIN EN ISO 9073-2: 1995.

The insole preferably has an air permeability of at least 50 mm / s, in particular at least 70 mm / s, further in particular at least 100 mm / s.

The air permeability is determined as follows:
The measurement of air permeability is based on the DIN EN ISO 9237: 1995-12 standard. The air permeability is expressed as the speed of an air flow, which under specified conditions, namely for the test area, the differential pressure and the time perpendicular to the surface passes through the measurement sample.

An air permeability tester in accordance with DIN EN ISO 9237 is to be used as the test device. Such an air permeability tester comprises a circular sample holder with an opening with a defined test area of 20 cm ² , further a device for torsion-free and secure attachment of the measurement sample, further preferably also a protective ring device, as an addition to the aforementioned device to prevent air from escaping the sample edges, further a pressure measuring device connected to the test head, a device for generating a constant air flow and for setting the flow speed with which a differential pressure can be generated and further a flow measuring device for displaying the flow speed. The device type FX 3300 laboratory tester III from Textest AG, Schwerzenbach, Switzerland, for example, can be used to carry out the measurement.

For sample preparation, the sample must be stored for at least 24 hours in a standard climate at 20 ± 2 ° C and 65 ± 4% relative humidity before the start of the test. The same conditions must be set during the test (20 ± 2 ° C and 65 ± 4% RH).

The test specimen is to be attached to the circular specimen holder with sufficient tension to avoid wrinkles. However, if wrinkles occur, care must be taken that the flat structure, i.e. the test sample, is not twisted in the clamping plane. With the insole to be measured, the sole surface with the coating is clamped in the direction of the negative pressure side, to avoid leaks. The suction fan, which is suitable for pushing the air through the test sample, or some other such device must be put into operation and the flow rate must be continuously adjusted until the differential pressure is reached. After reaching flow velocities under stable conditions, at least after waiting for at least one minute, the flow velocity must be noted. The test must be repeated at different points on the test sample at least 10 times under the same conditions. In the present case, the insole 100 Pa is used as the differential pressure.

The air permeability R is to be calculated in mm / s using the equation given in the standard: $$\mathrm{R.}=\frac{\mathrm{q}\left(\mathrm{v}\right)}{\mathrm{A.}}\times 167$$

Mean
q (v): arithmetic mean of the air flow in dm ³ / min (l / min)
A: test area, in cm ² , here 20 cm ²
167: Conversion factor of dm ³ / min or l / min per cm ² , in mm / s

In the case of tests in which no test sample adapted to the test surface of the circular sample holder is available or cannot be provided, such as for smaller and / or non-circular test samples, a test sample can be used by means of assembly with a carrier material. Then, in addition to the measurement of the actual test sample, parallel correction and normalization must be carried out during the measurement Measurements, so-called negative and zero controls, which take into account the carrier and adhesive materials, are carried along and included in the evaluation.

The insole is preferably a disposable product. In principle, however, insoles that can be washed or cleaned are also conceivable.

In the present manner, an insole can be provided which has particularly favorable properties in terms of flexural rigidity, breathability, air permeability and anti-slip properties of the sole.

• Figur 1 eine Darstellung einer Sohlenfläche einer erfindungsgemäßen Einlegesohle
• Figur 2 eine Einlegesohle vor Aufbringen der Beschichtung,
• Figuren
  3a - e) zeigen verschiedene Einzelmuster der Beschichtung,
• Figuren
  4a - c) zeigen eine schematische, nicht maßstabsgetreue Aufsicht auf ein Biegesteifigkeitsgerät mit Durchführung der Messung,
• Figur 4d eine Ansicht auf den Probenhalter in Richtung der Pfeile D-D in Figur 4a und
• Figur 5 zeigt eine schematische, nicht maßstabsgetreue Darstellung eines Ausschnitts eines Shore-A Härtemessgeräts.

Further features and details as well as advantages of the invention emerge from the drawing and the following description of the shoe sole according to the invention. In the drawing show:

• Figure 1 a representation of a sole surface of an insole according to the invention
• Figure 2 an insole before applying the coating,
• characters
  3a - e) show different individual samples of the coating,
• characters
  4a-c) show a schematic, not to scale plan view of a flexural rigidity device with the measurement being carried out,
• Figure 4d a view of the sample holder in the direction of Arrows DD in Figure 4a and
• Figure 5 shows a schematic representation, not to scale, of a section of a Shore-A hardness measuring device.

Figure 1 shows a plan view of the sole surface of an insole 100 according to the invention, the sole surface 102 facing an insole of a shoe in use of the insole and the surface opposite the sole surface facing the foot as a foot surface. The insole 100 consists of a base material made of nonwoven materials made of a mixture of natural cellulose-based fibers and synthetic fibers. This base material forms a layer of wadding fleece and is consolidated by the fact that it was embossed calendered, that is, it was passed between a heated calender roll with protruding embossing projections and a counter-pressure roll. In this way, the Figure 2 visible surface structure formed with punctiform and web-shaped embossed structures 106 in the illustrated case. The engraving depth that is achieved by calendering is 0.7 mm in the present case, but can be set as desired by a person skilled in the art on the basis of his specialist knowledge. In the area of the embossing, highly compacted embossed areas 106 are formed next to less compacted areas 110. The proportion of highly compacted areas 106 in the total area is 5-10% in this case.

In the case of a multi-layer base material, the connection of the layers can be achieved via a calender system with two steel rollers using pressure and temperature, and the embossing 106 can be applied at the same time. The that is, one of the two calender rolls has an engraving.

The multi-layer base material of the insole has a base layer with a grammage of preferably 200-250 g / m ² .

How Figure 1 shows, a coating 112 of coating lines 114 is provided on the sole surface 102 of the insole 100 facing away from the sole of the foot and facing the insole of a shoe. This serves to prevent the insole 100 from slipping in the shoe and, moreover, to improve the flexural rigidity of the sole. The coating lines 114 are polymer-based and preferably consist of EVA (ethylene vinyl acetate). The material preferably has a Shore A hardness of 60-80. The coating lines are applied by means of an engraving process, with the insole 100 being passed between an engraved roller and an opposing roller. In the present case, the width of the coating lines is 0.5-0.7 mm. The height of the coating lines is preferably 0.2-0.3 mm, so that the applied coating pattern does not cause any unpleasant haptic effects on the foot.

In the Figure 1 The coating shown has a multiplicity of individual patterns 120 which are formed by coating lines 114. In the case shown, each individual pattern 120 is preferably formed by pattern groups 124, the pattern groups consisting of at least three pattern elements 126, here concentrically arranged circles, and no coating compound is applied between the individual circles of each individual pattern group forming an individual pattern, i.e. an uncoated area 116 therein is present. That way will A total degree of coverage of approx. 20-25% on the sole surface is achieved through the coating lines 114. The individual elements 120 as such provide a relatively high area coverage of 80% of the sole surface 102, that is, the free areas outside the individual patterns 120, i.e. the outer uncoated areas 118 surrounding the individual patterns, take up approx. 20% of the sole area 102 . In this way, the flexural rigidity of the insole 100 can be designed in an advantageous manner with at the same time only slight impairment of the desired properties attributed to the base material of the insole, such as air permeability and / or breathability, which is not significantly influenced by the coating.

In addition, there is a coating in which the individual patterns 120 can indeed intersect, overlap or touch one another, but each individual pattern remains recognizable for itself and in particular cannot be connected by a continuous line that runs from one side (edge) of the sole 122a to one opposite side (edge) of the sole 122b, the advantage that there are no preferred directions. The sides (edges) of the sole 100 are in each case two opposite edge sections of the sole 100. In this way, the anti-slip properties can be improved in all directions.

Particularly preferred is a coating in which, due to the design of the individual patterns 120, at least one individual pattern 120, preferably at least 20% of the individual patterns 120 of the sole surface, particularly preferably each individual pattern 120, has a section or area 128 that is perpendicular, i.e. with a Angle 132 of 90 ° to any direction 130 in the surface of the insole 100, as in FIG Figure 3a is shown schematically. In this way, each direction of movement can be opposed by a portion that runs perpendicular to it and thus has the optimal slip resistance for this direction of movement. Such a section can also be formed in that an imaginary tangent 134 can be applied, which is perpendicular to the respective slip direction.

The optimal expression of the mentioned advantages is achieved in that the individual patterns 120 are discrete from one another and in particular do not merge into one another in such a way that the individual patterns 120 dissolve in the entirety of the patterns, as is the case, for example, for the individual diamonds or squares in a grid pattern .

Further preferred individual samples show the Figures 3a - 3e , whereby both different individual patterns can be combined with one another, such as the Figures 3a , 3b , 3d and 3e show, and, moreover, the individual patterns with regard to the formation of the coating lines, both with regard to their height and with regard to their width, can have a difference. In addition, it is also conceivable for the coating lines not to be continuous but to be interrupted, as is shown, for example, in Figure 3a is shown, provided that this does not lead to the dissolution of the overall pattern in such a way that the pattern can no longer be recognized as such.

If an individual pattern 120 is composed as a pattern group 124 from several pattern elements 126, these can, as in FIG Figures 3a and 3b shown, surround each other fully circumferentially at a distance, but also surround each other so that there are points of contact. In addition, it is It is also possible for the individual pattern elements of an individual pattern 120 to be arranged with the formation of contact or intersection areas, as is the case, for example Figure 3c shows. The individual samples according to the Figures 3a to 3e can be analogous to Figure 1 be designed in such a way that the individual patterns intersect, touch or overlap one another.

The dynamic coefficient of friction of the coated sole surface, measured based on ASTM D 1894-01, is between 0.8 and 1.4. The flexural rigidity of the coated insole 100 according to the invention is preferably 700-1000 mN, with a percentage increase in flexural rigidity compared to the uncoated sole of 15-20%. The air permeability of the insole is approx. 100 mm / s.

Claims (20)

1. An insole (100) for shoes with a base material comprising a sole face (102) facing the shoe and an opposing foot face facing the foot, a coating (112) being provided on the sole face (102) which provides the sole face (102) of the insole (100) with an increased frictional force relative to the uncoated sole face (102), characterized in that the coating (112) consists of a plurality of individual patterns (120) formed by coating lines (114), said patterns being discrete from one another and arranged in such a way that they cannot be formed by one or more continuous coating lines (114) extending continuously from a first side (122a) of the sole face (102) to an opposing second side (122b) of the sole face (102), wherein the individual patterns (120) are formed as open or closed patterns, and wherein an individual pattern (120) is more than one dot, and wherein, where the pattern takes the form of a line, the line must not extend exclusively as a straight line in just one vector direction, but rather this line pattern must comprise at least one curve and/or at least one bend, and wherein the sides (122a, 122b) of the sole face (102) are understood to mean all the borders or edges of the sole face (102).
2. The insole (100) as claimed in claim 1, characterized in that at least one individual pattern (120) comprises at least one portion which extends perpendicular to any desired direction in the sole face (102).
3. The insole (100) as claimed in claim 2, characterized in that the at least one portion is dot-shaped and a notional tangent applied thereto extends perpendicular to any desired direction in the sole face (102).
4. The insole (100) as claimed in one of the preceding claims, characterized in that at least one individual pattern (120) is formed as a pattern group (124), which comprises at least two pattern elements (126) formed from coating lines.
5. The insole (100) as claimed in claim 4, characterized in that a first pattern element (126) encircles a second or further pattern elements (126) at least in places, in particular completely.
6. The insole (100) as claimed in one of the preceding claims, characterized in that an uncoated outer region (118) surrounding the separate individual patterns (120) has a geometric shape which differs from a geometric shape of the individual pattern (120).
7. The insole (100) as claimed in one of the preceding claims, characterized in that at least one individual pattern (120) on the sole face (102) is enclosed on all sides by an uncoated outer region.
8. The insole (100) as claimed in one of the preceding claims, characterized in that the plurality of individual patterns (120) cover the sole face (102) substantially over the entire extent thereof.
9. The insole (100) as claimed in one of the preceding claims, characterized in that the sole face (102) exhibits a degree of coverage by the coating lines (114) of at least 6%, in particular at least 8%, in particular at least 10%, more particularly at least 20% and in particular of at most 50%, more particularly at most 40% and more particularly at most 30%.
10. The insole (100) as claimed in one of the preceding claims, characterized in that the individual patterns (120) in total occupy a proportion of the surface area of the sole face (102) of at least 20%, in particular at least 30% more particularly at least 40% and in particular at most 80%, more particularly at most 70% and more particularly at most 60%.
11. The insole (100) as claimed in one of the preceding claims, characterized in that the coating lines (114) have a line width of at least 0.2 mm, in particular at least 0.4 mm, more particularly at least 0.5 mm, more particularly at least 0.6 mm, in particular of at most 2.0 mm, more particularly at most 1.6 mm, more particularly at most 1.2 mm, more particularly at most 1.0 mm.
12. The insole (100) as claimed in one of the preceding claims, characterized in that the coating lines (114) have a length which corresponds to at least 5 times the width of the respective coating line, preferably at least 6 times, more preferably at least 8 times and more preferably at least 10 times the width of the respective coating line.
13. The insole (100) as claimed in one of the preceding claims, characterized in that the coating lines (114) have a height of at least 0.1 mm, in particular at least 0.2 mm and in particular of at most 0.8 mm, more particularly of at most 0.6 mm and more particularly of at most 0.4 mm.
14. The insole (100) as claimed in one of the preceding claims, characterized in that the coating lines are formed by continuous lines and/or lines interrupted at least in places, wherein the interruption is no longer than 10 times, in particular no longer than 8 times, in particular no longer than 6 times, in particular no longer than 4 times the line width of the line adjacent this interrupted point.
15. The insole (100) as claimed in one of the preceding claims, characterized in that the coating has a basis weight of at least 5 g/m², in particular at least 10 g/m², more particularly of at least 15 g/m², more particularly of at least 20 g/m², more particularly of at most 50 g/m², more particularly of at most 30 g/m².
16. The insole (100) as claimed in one of the preceding claims, characterized in that the coating is polymer-based and is formed from materials with a Shore A hardness of at least 30, in particular at least 40, in particular at least 50, more particularly at least 60, in particular of at most 90, more particularly at most 80, more particularly at most 70.
17. The insole (100) as claimed in one of the preceding claims, characterized in that the sole side with the coating has a dynamic coefficient of friction based on ASTM D1894-01 of at least 0.6, in particular at least 0.8, more particularly at least 1.0, in particular of at most 2.0, more particularly at most 1.5, more particularly at most 1.2.
18. The insole (100) as claimed in one of the preceding claims, characterized in that the insole has a flexural rigidity of at least 500 mN, in particular at least 600 mN, more particularly at least 700 mN, more particularly at most 3000 mN and more particularly at most 2000 mN.
19. The insole (100) as claimed in one of the preceding claims, characterized in that the insole (100) has a greater flexural rigidity than an insole without coating lines on the sole face (102), in particular in that the flexural rigidity is increased by 5%, more particularly by 10%, more particularly by 15%, more particularly by at most 50%, more particularly by at most 40%, more particularly by at most 30%.
20. The insole (100) as claimed in one of the preceding claims, characterized in that the base material of the insole (100) is of single- or multilayer construction and in particular comprises a nonwoven material.

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