EP2724635B1 - Breathable industrial safety shoe - Google Patents

Breathable industrial safety shoe Download PDF

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Publication number
EP2724635B1
EP2724635B1 EP20130189837 EP13189837A EP2724635B1 EP 2724635 B1 EP2724635 B1 EP 2724635B1 EP 20130189837 EP20130189837 EP 20130189837 EP 13189837 A EP13189837 A EP 13189837A EP 2724635 B1 EP2724635 B1 EP 2724635B1
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EP
European Patent Office
Prior art keywords
open
plastic material
breathable
foamed plastic
industrial safety
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
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EP20130189837
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German (de)
French (fr)
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EP2724635A1 (en
Inventor
Richard Fumy
Joachim Flemming
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Uvex Arbeitsschutz GmbH
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Uvex Arbeitsschutz GmbH
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Publication of EP2724635A1 publication Critical patent/EP2724635A1/en
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Publication of EP2724635B1 publication Critical patent/EP2724635B1/en
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    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B7/00—Footwear with health or hygienic arrangements
    • A43B7/06—Footwear with health or hygienic arrangements ventilated
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B7/00—Footwear with health or hygienic arrangements
    • A43B7/32—Footwear with health or hygienic arrangements with shock-absorbing means

Definitions

  • the invention relates to a safety shoe for protection against accidents comprising a shoe sole with a sole outer surface.
  • Safety shoes are used in a variety of configurations. In use are models with and without breathable function. The breathability can be realized in very different ways.
  • the upper material is perforated in the shaft region, whereby a gas exchange between the environment and the shoe inner region is possible.
  • the occupational shoes form a second type of safety footwear. They have no separate toe cap, but are characterized by other important for everyday working life properties, such as a high skid resistance. In order to design the existing safety shoes with a breathable function, a sometimes not inconsiderable effort is required.
  • document DE 195 30 272 A1 discloses a work protection shoe for protection against accidents comprising a shoe sole with a sole outer surface, wherein a proportion of more than 50% of the externally visible portions of the protective work shoe is made breathable and consists of at least one open-celled foamed plastic material.
  • the object of the invention is therefore to provide a safety shoe, on the one hand has a breathability and on the other hand can be easily produced.
  • the shoe sole is made breathable, and um-summarizes at least partially a foamed plastic material, so that at least 10% of the sole outer surface of this foamed plastic material, wherein the foamed plastic material contains foam cells, of which a proportion of more than 50% is open-celled, so that the plastic material gas permeable, in particular air and / or water vapor permeable, is.
  • a proportion of more than 50% of the externally visible portions of the protective work shoe is made breathable and consists, in particular completely, of at least one open-celled foamed plastic material.
  • breathability can be achieved in a particularly simple manner by using an open-celled foamed plastic material in particular but not only the sole of the shoe.
  • This is possible in particular because of the open-cell configuration of the plastic foam material used, in which the foam cells are not completely surrounded by plastic material. Due to the proportion of more than 50% of open foam cells (micro-) channels are formed in the material of the shoe sole, can pass through the air and / or water vapor from Schuhinnen Kunststoff Outwards and vice versa from the outside into the shoe inner region.
  • the plastic foam material can also be referred to as open-pored. If this is an "open-cell" plastic foam material, it is assumed that in each case a proportion of more than 50% of the foam cells is open-celled.
  • the breathability is particularly pronounced when not only the shoe sole, but also the highest possible proportion of the work protection shoe is made of or with an open-cell plastic foam material.
  • more than one open-cell plastic foam material can be used.
  • the work protection shoe is then largely and possibly even almost completely made of plastic material (s), whereby a particularly simple production can be realized.
  • plastic material s
  • the breathability achieved on account of the favorable open-cell plastic foam material is advantageously associated with virtually no or at least no significant additional outlay in production. Even with currently common industrial safety shoes shoe soles are made of plastic materials, which, however, are not designed open-cell and thus not breathable. As a result of the use of the open-cell plastic foam material provided according to the invention, no significant new manufacturing processes are required. Nevertheless, with the breathability especially but not only the outsole, a significant new additional property is achieved. Another finding of the invention in this context is that the favorable plastic foam material, despite the breathability decisive open-celledness the usual mechanical requirements, such as a support and / or holding function, which are made in particular to a shoe sole, readily meet.
  • the mentioned favorable breathability due to the use of the open-cell plastic foam may be provided in various types of protective work shoes, especially in safety shoes and professional shoes.
  • the shoe sole has a multi-part construction with an outsole and a midsole, and at least the midsole comprises the open-celled foamed plastic material.
  • the midsole may also consist entirely of the open-celled foamed plastic material. This is favorable, since the midsole is positioned closer to the shoe inner region, in which foot perspiration to be removed, for example, is positioned as the outsole. It has been found that a breathable design of the midsole sufficient for a sufficient air / water exchange with the environment. The breathability of the work protection shoe can therefore also be realized very well.
  • the outsole may in this embodiment in particular also consist of another, for example non-breathable (plastic) material.
  • the outsole also comprises an open-celled foamed plastic material.
  • it can also completely made of this foamed plastic material consist.
  • both the midsole and outsole are made breathable, whereby the breathability is further improved.
  • another open-celled foamed plastic material or another composition of the open-celled foamed plastic material is provided.
  • the same material can be used for both soles.
  • the shoe sole may have other components, such as an insole. It is particularly advantageous if at least the insole and possibly also other of these other shoe sole components are made of or with an open-celled foamed plastic material.
  • a breathable toe cap which at least partially comprises an open-celled foamed plastic material, wherein in particular at least part of a cap outer surface, for example the top, the toe cap is made with the open-celled foamed plastic material or in particular consists entirely of the open-cell foamed plastic material ,
  • the toe cap may be formed either with or without separate shockproof toe cap.
  • the toe cap at least partially consists of an open-cell plastic foam, the proportion of breathable portions of the protective work shoe increases. This further improves the air / water vapor exchange.
  • a breathable shaft region which at least partially comprises an open-celled foamed plastic material, wherein in particular at least a part of a shaft outer surface of the shaft portion is made with the open-celled foamed plastic material or in particular consists entirely of the open-celled foamed plastic material.
  • the air / water vapor exchange with the environment is then carried out in particular over the part of the shaft outer surface which comprises the advantageous open-cell plastic foam material.
  • a proportion of more than 55%, preferably of more than 90%, of the parts of the work protection shoe visible from the outside is made breathable and consists, in particular completely, of at least one open-celled foamed plastic material.
  • the breathability is particularly pronounced when the highest possible proportion of the work protection shoe is made of a low-cost open-cell plastic foam material.
  • a separate open-cell plastic foam material can be provided in each case for different partial areas.
  • a particularly simple production results in a further advantageous embodiment, in which the visible from the outside portions of the protective work shoe, which are not made breathable, made of a different plastic material.
  • this embodiment therefore, only plastics, either breathable or non-breathable, are used. This results in uniform manufacturing methods, whereby the total effort required to produce the work protection shoe can be reduced.
  • Another favorable embodiment is characterized by at least one breathable portion with an open-celled foamed Plastic material, wherein the breathable portion is injected. It is also possible to provide a plurality of such sprayed, breathable partial areas, each with an open-celled foamed plastic material.
  • a protective work shoe can be produced in a particularly simple and cost-effective manner.
  • the still liquid plastic material is injected in such a spraying process, in particular without pressure by means of an injection channel or injection slot in a preferably closed mold. This advantageously takes place at room temperature.
  • the injected liquid plastic material consists in particular of a mixture of at least two precursors, wherein the mixing together of the at least two precomponents takes place shortly before the injection, preferably just before the injection channel. A chemical reaction of the precursors to form the open-cell plastic foam then takes place substantially within the closed mold into which the mixed still liquid plastic raw material is injected. This is a very efficient manufacturing method for the breathable part (s) of the work protection shoe.
  • the open-celled foamed plastic material is a polyurethane.
  • This polyurethane is preferably formed by a reaction of a polyol component, in particular a polyester polyol or a polyether polyol, with an isocyanate component and with at least one additional crosslinker.
  • a polyol component in particular a polyester polyol or a polyether polyol
  • an isocyanate component and with at least one additional crosslinker.
  • the result is the advantageous breathable design as open-cell polyurethane foam.
  • a proportion of more than 50% of the foam cells is not closed, but open-pored.
  • the cell bridges and cell membranes in the cell framework are interrupted. Between the individual foam cells and with the environment can thus already mentioned gas exchange (In particular air / water vapor exchange) take place by means of flow and / or diffusion.
  • gas exchange In particular air / water vapor exchange
  • the open foam cells are in particular due to the fact that the walls between the cell webs do not remain intact during the foaming process, but are destroyed by the expansion pressure occurring during the chemical reaction.
  • the open-celled foamed plastic material made of polyurethane has a Shore A hardness in the range from 35 to 45, preferably between 37 and 43, and particularly preferably about 40.
  • the open-cell foamed plastic material made of polyurethane has in particular a density in the range of 0.25 g / cm 3 to 0.35 g / cm 3 , preferably between 0.27 g / cm 3 and 0.33 g / cm 3 and more preferably of 0.3 g / cm 3 .
  • the midsole is formed from or with the open-celled foamed plastic material.
  • the polyurethane open-cell foamed plastic material may in particular also have a Shore A hardness in the range from 45 to 60, and preferably between 50 and 55.
  • the open-cell foamed plastic material of polyurethane can, in particular, an alternative density in the range of 0.45 g / cm 3 to 0.6 g / cm 3 and preferably between 0.5 g / cm 3 and 0.55 g / cm 3.
  • the shoe sole is then in particular constructed in one piece and preferably consists only of a single material, namely the said open-celled foamed plastic material.
  • the value range of the open-cell foamed plastic material of polyurethane which is preferred for the hardness is thus in the range from 35 to 60, in particular for a Shore hardness A. Accordingly, the preferred density range for the density of the open-celled foamed plastic material of polyurethane is in particular in the range from 0.25 g / cm 3 to 0.6 g / cm 3 .
  • Such an open-cell polyurethane foam offers both the mechanical stability necessary for a protective work shoe and the desired breathability desired for a work protection shoe used in the industrial and / or commercial sector.
  • the said polyurethane foams have these two properties, which are in themselves contradictory.
  • the protective properties indispensable in the field of occupational safety are still present despite the additionally introduced breathability.
  • the density and other mechanical properties of the open-celled polyurethane foam can preferably be adjusted by the mixing ratio of the polyol component and the isocyanate component and / or by the choice of crosslinking agent according to the respective requirements.
  • an open-celled polyurethane foam is particularly well suited for use in breathable areas of a protective work shoe.
  • Another advantage of the open-cell polyurethane foam is its low weight, which further increases the wearing comfort of the work protection shoe.
  • a breathable insole is provided.
  • the insole can be made of or with a breathable material, for example made of or with an open-cell plastic foam material, in particular an open-cell polyurethane foam.
  • the breathability may also be brought about in another way, in particular by means of a suitable perforation of the insole.
  • the breathable design of the insole ensures that the beneficial gas exchange between the Shoe interior and the environment can be done in particular on the shoe sole.
  • a non-breathable insole would at least considerably complicate, if not completely suppress, this.
  • a breathable insole is of particular advantage. It is advantageous if the shoe interior facing the layer of the shoe sole, so in particular the insole, preferably also made of or with an open-cell plastic foam material.
  • the foamed plastic material is provided with an antibacterial additive.
  • this additive is mixed homogeneously.
  • the antibacterial additive helps reduce the unpleasant odor caused by foot sweat.
  • the use of the antibacterial additive is especially advantageous when the work protection shoe is a professional shoe used in the medical field.
  • the antibacterial additive may help to kill bacteria, germs, viruses or the like that come in contact with the occupational safety shoe.
  • the antibacterial additive is silver or comprises silver. Silver has a very good antibacterial behavior and is therefore particularly well suited for addition to the foamed plastic material of the work protection shoe.
  • purely metallic silver nanoparticles with a size of at most 20 nm are evenly distributed and firmly embedded in the plastic material as antibacterial additive.
  • the small size of the silver nanoparticles means that the addition of this additive is not noticeable, especially in the externally visible color design of the industrial safety shoe.
  • the uniformly distributed and strong embedding of the silver nanoparticles in the foamed plastic material leads to a virtually inexhaustible and, above all, permanent reservoir of biologically active silver ions.
  • the silver ions are formed by continuous oxidation on the surface of the silver nanoparticles due to a (residual) moisture always present in the normal ambient air.
  • the silver ions thus formed reach the outer surface of the protective work shoe and kill off bacteria and / or viruses, thus substantiating the antibacterial effect of the additive. Due to the solid embedding in the foamed plastic material, the silver nanoparticles can not be washed out, so that the beneficial antibacterial effect is permanent.
  • the embedded silver nanoparticles also support antistatic behavior. At least they help to prevent unwanted static charges of the shoe wearer.
  • a heel protection insert is provided at the bottom of the shoe sole.
  • the heel protection insert preferably fulfills a protective function in which the breathability in the area of the heel protection insert plays a particularly minor role.
  • a non-breathable material is provided for the heel protector insert, for example, another polyurethane, such as an elastomeric polyurethane, or a thermoplastic polyurethane or a rubber material.
  • the heel protector insert may also be colored differently than the rest of the shoe sole, in particular to highlight the specific (protective) function also visually.
  • FIGURE shows an exemplary embodiment of a breathable work protection shoe made of or with open-cell, foamed plastic material.
  • a safety shoe 1 in the form of a safety shoe.
  • the occupational safety shoe 1 comprises a plurality of externally visible partial regions, in particular a shoe sole 2, a toe cap 3 and a shaft region 4.
  • the shoe sole 2 is itself composed of a midsole 5 and an outsole 6 which comprises a heel protection insert 7.
  • the shoe sole 2 has a sole outer surface 8.
  • the heel protection insert comprises in addition to the component which forms a visible in the figure cap outer surface 9, at least also not visible in the figure, the protection of the toes serving, shockproof cap insert, as often in a safety shoe is common.
  • the shaft region 4 has a work outer surface 10.
  • the work protection shoe 1 is made breathable.
  • at least the shoe sole 2 is realized by means of an open-cell plastic foam material, wherein at least 10% of the sole outer surface 8 contains this open-cell plastic foam material.
  • an open-cell plastic foam material is provided for the midsole 5.
  • This material is a polyurethane foam having a Shore A hardness of about 40 and a density of about 0.3 g / cm 3. Due to the open-celledness or open porosity the polyurethane foam ensures an advantageous gas exchange between a shoe interior and the environment, whereby the overall breathability of the work protection shoe 1 results. It has been found that the breathable designed as described above midsole 5 is sufficient to bring about a very good gas exchange.
  • the midsole 5 and the outsole 6 optionally apart from the heel protection insert 7 and / or other special (protective) inserts not shown in detail - an open-cell plastic foam material, and in turn an open-cell polyurethane foam provided.
  • an open-cell plastic foam material and in turn an open-cell polyurethane foam provided.
  • the outsole 6 can also be produced from an open-cell polyurethane foam which is very favorable in terms of breathability, without the other properties required for the occupational safety shoe 1, such as, for example, mechanical stability, impact resistance, cut resistance, chemical stability and skid resistance, be significantly affected.
  • the toe cap 3 has a favorable breathability.
  • an open-cell plastic foam material is also provided for the shaft region 4.
  • an open-cell polyurethane foam is also provided for the shaft region 4.
  • the visible parts of the work protection shoe 1 visible from the outside can be made of or with a breathable plastic material, namely in particular an open-celled polyurethane foam.
  • the optionally remaining, non-breathable portions are advantageously also made of a plastic material.
  • a protective work shoe which is practically almost completely made of plastic materials and thus much easier and cheaper to manufacture compared with a conventional safety shoe.
  • a high level of comfort is still given, since due to the favorable choice of plastic material, in particular in the form of open-cell polyurethane foam, a very good gas exchange with the environment is given.
  • the subsections of the occupational safety footwear 1 mentioned above in detail can each be realized with an open-cell plastic material which is identical or different in the individual partial areas.
  • the breathable plastic materials may in each case be of the same type of base material, that is to say in particular of the polyurethane type, be, but adapted to the respective sub-range different mixing ratios or different characteristics of the material precursors have.
  • the polyol components and isocyanate components provided in each subarea for polyurethane foam preparation can be present in different concentrations and / or differ from one another.
  • the work protection shoe 1 can be manufactured by means of common plastic production methods. In particular, it is designed as a simple molded part. This considerably simplifies the manufacturing process compared to conventional protective work shoes.
  • the open-cell plastic foam material at least one antibacterial additive, in particular in the form of metallic silver nanoparticles, is mixed.
  • the silver nanoparticles are preferably uniformly distributed within the open-cell plastic foam material and also embedded firmly in the matrix of the open-cell plastic foam material.
  • a breathable insole not shown in the figure is also provided, which may for example also be made of an open-cell plastic foam material, in particular an open-cell polyurethane foam.
  • gas exchange between the shoe inner region and the environment which is possible in virtually all subsections of the protective work shoe 1, is indicated in the figure by double arrows 11.
  • the gas exchange takes place in particular as air and / or steam exchange instead of.
  • the open-cell plastic foam materials used have a permeability to these gaseous components.
  • the safety shoe 1 therefore has a high wearing comfort on the one hand because of the favorable breathability. On the other hand, it can be produced very easily by means of a spraying process. In particular, the latter is not provided in hitherto known safety shoes, which also have a certain breathability.

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  • Health & Medical Sciences (AREA)
  • Epidemiology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)

Description

Die Erfindung betrifft einen Arbeitsschutzschuh zum Schutz vor Unfällen umfassend eine Schuhsohle mit einer Sohlenaußenfläche.The invention relates to a safety shoe for protection against accidents comprising a shoe sole with a sole outer surface.

Arbeitsschutzschuhe werden in vielfältigen Ausgestaltungen verwendet. Im Einsatz sind Modelle mit und ohne atmungsaktiver Funktion. Die Atmungsaktivität kann dabei auf sehr unterschiedliche Art und Weise realisiert sein. Bei einer derzeit gängigen Ausgestaltung ist das Obermaterial im Schaftbereich perforiert, wodurch ein Gasaustausch zwischen der Umgebung und dem Schuhinnenbereich möglich ist. Es gibt unterschiedliche Typen von Arbeitsschutzschuhen, die jeweils auch atmungsaktiv ausgestaltet sein können. Ein erster Typ ist der Sicherheitsschuh, der insbesondere zum Schutz der Zehen im Zehenbereich des Schuhs mit einem aus einem besonders stoßfesten Material hergestellten Einsatz (= Zehenschutzkappe) versehen ist. Die Berufsschuhe bilden einen zweiten Typ von Arbeitsschutzschuhen. Sie haben keine gesonderte Zehenschutzkappe, zeichnen sich aber durch andere für den Berufsalltag wichtige Eigenschaften, wie zum Beispiel eine hohe Rutschfestigkeit, aus. Um die bestehenden Arbeitsschutzschuhe mit einer atmungsaktiven Funktion auszugestalten, ist ein zum Teil nicht unbeträchtlicher Aufwand erforderlich.Safety shoes are used in a variety of configurations. In use are models with and without breathable function. The breathability can be realized in very different ways. In a currently common embodiment, the upper material is perforated in the shaft region, whereby a gas exchange between the environment and the shoe inner region is possible. There are different types of protective work shoes, which can also be made breathable. A first type is the safety shoe, which is provided in particular for the protection of the toes in the toe area of the shoe with an insert made of a particularly impact-resistant material (= toe cap). The occupational shoes form a second type of safety footwear. They have no separate toe cap, but are characterized by other important for everyday working life properties, such as a high skid resistance. In order to design the existing safety shoes with a breathable function, a sometimes not inconsiderable effort is required.

Dokument DE 195 30 272 A1 offenbart einen Arbeitsschutzschuh zum Schutz vor Unfällen umfassend eine Schuhsohle mit einer Sohlenaußenfläche, wobei ein Anteil von mehr als 50 % der von außen sichtbaren Teilbereiche des Arbeitsschutzschuhs atmungsaktiv ausgestaltet ist und aus mindestens einem offenzelligen aufgeschäumten Kunststoffmaterial besteht.document DE 195 30 272 A1 discloses a work protection shoe for protection against accidents comprising a shoe sole with a sole outer surface, wherein a proportion of more than 50% of the externally visible portions of the protective work shoe is made breathable and consists of at least one open-celled foamed plastic material.

Die Aufgabe der Erfindung besteht deshalb darin, einen Arbeitsschutzschuh anzugeben, der einerseits eine Atmungsaktivität aufweist und der sich andererseits einfach herstellen lässt.The object of the invention is therefore to provide a safety shoe, on the one hand has a breathability and on the other hand can be easily produced.

Zur Lösung dieser Aufgabe wird ein Arbeitsschutzschuh entsprechend den Merkmalen des Patentanspruchs 1 angegeben. Bei dem erfindungsgemäßen Arbeitsschutzschuh ist die Schuhsohle atmungsaktiv ausgestaltet, und um-fasst zumindest teilweise ein aufgeschäumtes Kunststoffmaterial, so dass mindestens 10 % der Sohlenaußenfläche dieses aufgeschäumte Kunststoffmaterial aufweist, wobei das aufgeschäumte Kunststoffmaterial Schaumzellen enthält, von denen ein Anteil von mehr als 50 % offenzellig ausgebildet ist, so dass das Kunststoffmaterial gasdurchlässig, insbesondere luft- und/oder wasserdampfdurchlässig, ist. Weiterhin ist ein Anteil von mehr als 50 % der von außen sichtbaren Teilbereiche des Arbeitsschutzschuhs atmungsaktiv ausgestaltet und besteht, insbesondere vollständig, aus mindestens einem offenzelligen aufgeschäumten Kunststoffmaterial.To solve this problem, a safety shoe according to the features of claim 1 is given. In the work protection shoe according to the invention, the shoe sole is made breathable, and um-summarizes at least partially a foamed plastic material, so that at least 10% of the sole outer surface of this foamed plastic material, wherein the foamed plastic material contains foam cells, of which a proportion of more than 50% is open-celled, so that the plastic material gas permeable, in particular air and / or water vapor permeable, is. Furthermore, a proportion of more than 50% of the externally visible portions of the protective work shoe is made breathable and consists, in particular completely, of at least one open-celled foamed plastic material.

Es wurde erkannt, dass durch die Verwendung eines offenzelligen aufgeschäumten Kunststoffmaterials für insbesondere aber nicht nur die Schuhsohle auf besonders einfache Art und Weise eine Atmungsaktivität erzielt werden kann. Der Gasaustausch (= insbesondere Luft- und/oder Wasserdampfaustausch) zwischen dem Schuhinnenbereich und der Umgebung erfolgt dann gerade auch über die Schuhsohle. Dies ist insbesondere aufgrund der offenzelligen Ausgestaltung des verwendeten Kunststoffschaummaterials möglich, bei dem die Schaumzellen nicht komplett von Kunststoffmaterial umgeben sind. Aufgrund des Anteils von mehr als 50 % an offenen Schaumzellen sind im Material der Schuhsohle (Mikro-)Kanäle gebildet, durch die Luft und/oder Wasserdampf vom Schuhinnenbereich nach außen und umgekehrt von außen in den Schuhinnenbereich gelangen kann. Dieser Austausch ist insbesondere dann sehr effizient, wenn ein Anteil von mindestens 10 % der Sohlenaußenfläche dieses vorteilhafte offenzellige Kunststoffschaummaterial enthält. Aufgrund der offenen Schaumzellen kann das Kunststoffschaummaterial auch als offenporig bezeichnet werden. Sofern hier von einem "offenzelligen" Kunststoffschaummaterial die Rede ist, wird davon ausgegangen, dass jeweils ein Anteil von mehr als 50 % der Schaumzellen offenzellig ausgebildet ist.It has been recognized that breathability can be achieved in a particularly simple manner by using an open-celled foamed plastic material in particular but not only the sole of the shoe. The gas exchange (= in particular air and / or water vapor exchange) between the shoe inner region and the environment then takes place just above the shoe sole. This is possible in particular because of the open-cell configuration of the plastic foam material used, in which the foam cells are not completely surrounded by plastic material. Due to the proportion of more than 50% of open foam cells (micro-) channels are formed in the material of the shoe sole, can pass through the air and / or water vapor from Schuhinnenbereich outwards and vice versa from the outside into the shoe inner region. This replacement is very efficient, in particular, if a proportion of at least 10% of the sole outer surface contains this advantageous open-cell plastic foam material. Due to the open foam cells, the plastic foam material can also be referred to as open-pored. If this is an "open-cell" plastic foam material, it is assumed that in each case a proportion of more than 50% of the foam cells is open-celled.

Die Atmungsaktivität ist besonders ausgeprägt, wenn nicht nur die Schuhsohle, sondern darüber hinaus ein möglichst hoher Anteil des Arbeitsschutzschuhs aus oder mit einem offenzelligen Kunststoffschaummaterial hergestellt ist. Dabei kann insbesondere mehr als ein offenzelliges Kunststoffschaummaterial verwendet werden. So ist z.B. der eine Extremfall, bei dem für jeden der atmungsaktiven Teilbereiche jeweils ein gesondertes offenzelliges Kunststoffschaummaterial vorgesehen ist, ebenso möglich wie der andere Extremfall, bei dem für alle atmungsaktiven Teilbereiche das gleiche offenzellige Kunststoffschaummaterial vorgesehen ist. Vorzugsweise besteht der Arbeitsschutzschuh dann größtenteils und gegebenenfalls sogar fast vollständig aus Kunststoffmaterial(ien), wodurch sich eine besonders einfache Herstellung realisieren lässt. Zugleich ist trotz des hohen Kunststoffanteils ein hoher Tragekomfort mit einer sehr guten Atmungsaktivität gegeben. Letzteres resultiert aus dem zumindest teilweise verwendeten offenzelligen Kunststoffschaum.The breathability is particularly pronounced when not only the shoe sole, but also the highest possible proportion of the work protection shoe is made of or with an open-cell plastic foam material. In particular, more than one open-cell plastic foam material can be used. For example, e.g. the one extreme case, in each of which a separate open-cell plastic foam material is provided for each of the breathable portions, as possible as the other extreme case in which the same open-cell plastic foam material is provided for all breathable portions. Preferably, the work protection shoe is then largely and possibly even almost completely made of plastic material (s), whereby a particularly simple production can be realized. At the same time, despite the high plastic content, a high wearing comfort with a very good breathability is given. The latter results from the at least partially used open-cell plastic foam.

Die aufgrund des günstigen offenzelligen Kunststoffschaummaterials erzielte Atmungsaktivität ist vorteilhaferweise mit praktisch keinem oder zumindest keinem maßgeblichen Zusatzaufwand in der Fertigung verbunden. Auch bei derzeit gängigen Arbeitsschutzschuhen werden die Schuhsohlen aus Kunststoffmaterialien, die allerdings nicht offenzellig und damit nicht atmungsaktiv ausgestaltet sind, hergestellt. Durch den Einsatz des erfindungsgemäß vorgesehen offenzelligen Kunststoffschaummaterials sind insofern keine wesentlichen neuen Fertigungsverfahren erforderlich. Trotzdem wird mit der Atmungsaktivität insbesondere aber nicht nur der Laufsohle eine wesentliche neue Zusatzeigenschaft erreicht. Eine weitere Erkenntnis der Erfindung besteht in diesem Zusammenhang auch darin, dass das günstige Kunststoffschaummaterial trotz der für die Atmungsaktivität maßgeblichen Offenzelligkeit den üblichen mechanischen Anforderungen, wie zum Beispiel einer Stütz- und/oder Haltefunktion, die insbesondere an eine Schuhsohle gestellt werden, ohne Weiteres gerecht wird.The breathability achieved on account of the favorable open-cell plastic foam material is advantageously associated with virtually no or at least no significant additional outlay in production. Even with currently common industrial safety shoes shoe soles are made of plastic materials, which, however, are not designed open-cell and thus not breathable. As a result of the use of the open-cell plastic foam material provided according to the invention, no significant new manufacturing processes are required. Nevertheless, with the breathability especially but not only the outsole, a significant new additional property is achieved. Another finding of the invention in this context is that the favorable plastic foam material, despite the breathability decisive open-celledness the usual mechanical requirements, such as a support and / or holding function, which are made in particular to a shoe sole, readily meet.

Die angesprochene günstige Atmungsaktivität aufgrund des Einsatzes des offenzelligen Kunststoffschaums kann bei verschiedenen Typen von Arbeitsschutzschuhen vorgesehen sein, insbesondere bei Sicherheitsschuhen und bei Berufsschuhen.The mentioned favorable breathability due to the use of the open-cell plastic foam may be provided in various types of protective work shoes, especially in safety shoes and professional shoes.

Vorteilhafte Ausgestaltungen des erfindungsgemäßen Arbeitsschutzschuhs ergeben sich aus den Merkmalen der von Anspruch 1 abhängigen Ansprüche.Advantageous embodiments of the work protection shoe according to the invention will become apparent from the features of the dependent claims of claim 1.

Günstig ist eine Ausgestaltung, bei der die Schuhsohle einen mehrteiligen Aufbau mit einer Laufsohle und einer Zwischensohle aufweist, und mindestens die Zwischensohle das offenzellige aufgeschäumte Kunststoffmaterial umfasst. Insbesondere kann die Zwischensohle auch vollständig aus dem offenzelligen aufgeschäumten Kunststoffmaterial bestehen. Dies ist günstig, da die Zwischensohle näher am Schuhinnenbereich, in dem z.B. abzutransportierender Fußschweiß entsteht, positioniert ist als die Laufsohle. Es hat sich herausgestellt, dass eine atmungsaktive Ausgestaltung der Zwischensohle für einen ausreichenden Luft-/Wasseraustausch mit der Umgebung genügt. Die Atmungsaktivität des Arbeitsschutzschuhs kann also auch so sehr gut realisiert werden. Die Laufsohle kann bei dieser Ausgestaltung insbesondere auch aus einem anderen, beispielsweise nicht atmungsaktiven (Kunststoff-) Material bestehen. Ebenso ist es aber im Rahmen einer weiteren günstigen Ausgestaltung möglich, dass auch die Laufsohle ein offenzelliges aufgeschäumtes Kunststoffmaterial umfasst. Insbesondere kann sie auch vollständig aus diesem aufgeschäumten Kunststoffmaterial bestehen. In dieser bevorzugten Ausgestaltung sind dann sowohl die Zwischensohle als auch Laufsohle atmungsaktiv ausgestaltet, wodurch die Atmungsaktivität weiter verbessert wird. Es ist möglich, dass für die Laufsohle und für die Zwischensohle jeweils ein anderes offenzelliges aufgeschäumtes Kunststoffmaterial oder eine andere Zusammensetzung des offenzelligen aufgeschäumten Kunststoffmaterials vorgesehen ist. Grundsätzlich kann aber auch das gleiche Material für beide Sohlen verwendet werden. Generell kann die Schuhsohle noch weitere Bestandteile, wie z.B. eine Brandsohle, haben. Es ist insbesondere günstig, wenn zumindest die Brandsohle und ggf. auch andere dieser weiteren Schuhsohlenbestandteile aus oder mit einem offenzelligen aufgeschäumten Kunststoffmaterial hergestellt sind.A refinement is advantageous in which the shoe sole has a multi-part construction with an outsole and a midsole, and at least the midsole comprises the open-celled foamed plastic material. In particular, the midsole may also consist entirely of the open-celled foamed plastic material. This is favorable, since the midsole is positioned closer to the shoe inner region, in which foot perspiration to be removed, for example, is positioned as the outsole. It has been found that a breathable design of the midsole sufficient for a sufficient air / water exchange with the environment. The breathability of the work protection shoe can therefore also be realized very well. The outsole may in this embodiment in particular also consist of another, for example non-breathable (plastic) material. Likewise, however, it is possible within the scope of a further favorable embodiment that the outsole also comprises an open-celled foamed plastic material. In particular, it can also completely made of this foamed plastic material consist. In this preferred embodiment, then both the midsole and outsole are made breathable, whereby the breathability is further improved. It is possible that for the outsole and for the midsole, in each case another open-celled foamed plastic material or another composition of the open-celled foamed plastic material is provided. In principle, however, the same material can be used for both soles. In general, the shoe sole may have other components, such as an insole. It is particularly advantageous if at least the insole and possibly also other of these other shoe sole components are made of or with an open-celled foamed plastic material.

Gemäß einer weiteren günstigen Ausgestaltung ist eine atmungsaktive Zehenkappe vorgesehen, die zumindest teilweise ein offenzelliges aufgeschäumtes Kunststoffmaterial umfasst, wobei insbesondere mindestens ein Teil einer Kappenaußenfläche, beispielsweise die Oberseite, der Zehenkappe mit dem offenzelligen aufgeschäumten Kunststoffmaterial hergestellt ist oder insbesondere vollständig aus dem offenzelligen aufgeschäumten Kunststoffmaterial besteht. Die Zehenkappe kann dabei entweder mit oder ohne gesonderter stoßfester Zehenschutzkappe ausgebildet sein. Wenn auch die Zehenkappe zumindest teilweise aus einem offenzelligen Kunststoffschaum besteht, erhöht sich der Anteil an atmungsaktiven Teilbereichen des Arbeitsschutzschuhs. Dadurch wird der Luft-/Wasserdampfaustausch weiter verbessert.According to a further advantageous embodiment, a breathable toe cap is provided, which at least partially comprises an open-celled foamed plastic material, wherein in particular at least part of a cap outer surface, for example the top, the toe cap is made with the open-celled foamed plastic material or in particular consists entirely of the open-cell foamed plastic material , The toe cap may be formed either with or without separate shockproof toe cap. Although the toe cap at least partially consists of an open-cell plastic foam, the proportion of breathable portions of the protective work shoe increases. This further improves the air / water vapor exchange.

Der gleiche Vorteil stellt sich bei einer weiteren günstigen Ausgestaltung ein, bei der ein atmungsaktiver Schaftbereich vorgesehen ist, der zumindest teilweise ein offenzelliges aufgeschäumtes Kunststoffmaterial umfasst, wobei insbesondere mindestens ein Teil einer Schaftaußenfläche des Schaftbereichs mit dem offenzelligen aufgeschäumten Kunststoffmaterial hergestellt ist oder insbesondere vollständig aus dem offenzelligen aufgeschäumten Kunststoffmaterial besteht. Der Luft-/Wasserdampfaustausch mit der Umgebung erfolgt dann insbesondere über den Teil der Schaftaußenfläche der das vorteilhafte offenzellige Kunststoffschaummaterial umfasst.The same advantage arises in a further favorable embodiment in which a breathable shaft region is provided, which at least partially comprises an open-celled foamed plastic material, wherein in particular at least a part of a shaft outer surface of the shaft portion is made with the open-celled foamed plastic material or in particular consists entirely of the open-celled foamed plastic material. The air / water vapor exchange with the environment is then carried out in particular over the part of the shaft outer surface which comprises the advantageous open-cell plastic foam material.

Gemäß einer weiteren günstigen Ausgestaltung ist ein Anteil von mehr als 55 %, vorzugsweise von mehr als 90 %, der von außen sichtbaren Teilbereiche des Arbeitsschutzschuhs atmungsaktiv ausgestaltet und besteht, insbesondere vollständig, aus mindestens einem offenzelligen aufgeschäumten Kunststoffmaterial. Wie bereits erwähnt, ist die Atmungsaktivität besonders ausgeprägt, wenn ein möglichst hoher Anteil des Arbeitsschutzschuhs aus einem günstigen offenzelligen Kunststoffschaummaterial hergestellt ist. Dabei kann für verschiedene Teilbereiche wiederum jeweils ein gesondertes offenzelliges Kunststoffschaummaterial vorgesehen sein.According to a further favorable embodiment, a proportion of more than 55%, preferably of more than 90%, of the parts of the work protection shoe visible from the outside is made breathable and consists, in particular completely, of at least one open-celled foamed plastic material. As already mentioned, the breathability is particularly pronounced when the highest possible proportion of the work protection shoe is made of a low-cost open-cell plastic foam material. In this case, in each case a separate open-cell plastic foam material can be provided in each case for different partial areas.

Eine besonders einfache Herstellung resultiert bei einer weiteren günstigen Ausgestaltung, bei der die von außen sichtbaren Teilbereiche des Arbeitsschutzschuhs, die nicht atmungsaktiv ausgestaltet sind, aus einem anderen Kunststoffmaterial bestehen. Bei dieser Ausgestaltung kommen also nur Kunststoffe, entweder atmungsaktive oder auch nicht atmungsaktive, zum Einsatz. Dadurch ergeben sich einheitliche Fertigungsmethoden, wodurch der insgesamt erforderliche Aufwand zur Herstellung des Arbeitsschutzschuhes reduziert werden kann.A particularly simple production results in a further advantageous embodiment, in which the visible from the outside portions of the protective work shoe, which are not made breathable, made of a different plastic material. In this embodiment, therefore, only plastics, either breathable or non-breathable, are used. This results in uniform manufacturing methods, whereby the total effort required to produce the work protection shoe can be reduced.

Eine weitere günstige Ausgestaltung zeichnet sich durch mindestens einen atmungsaktiven Teilbereich mit einem offenzellligen aufgeschäumten Kunststoffmaterial aus, wobei der atmungsaktive Teilbereich gespritzt ist. Es können auch mehrere solcher gespritzten atmungsaktiven Teilbereiche mit jeweils einem offenzellig aufgeschäumten Kunststoffmaterial vorgesehen sein. Ein derartiger Arbeitsschutzschuh lässt sich besonders einfach und kostengünstig herstellen. Das noch flüssige Kunststoffmaterial wird bei einem derartigen Spritzverfahren insbesondere ohne Druck mittels eines Einspritzkanals oder Einspritzschlitzes in eine vorzugsweise geschlossene Form eingespritzt. Vorteilhafterweise erfolgt dies bei Raumtemperatur. Das eingespritzte flüssige Kunststoffmaterial besteht dabei insbesondere aus einer Mischung von mindestens zwei Vorkomponenten, wobei das Zusammenmischen der mindestens zwei Vorkomponenten kurz vor dem Einspritzen, vorzugsweise kurz vor dem Einspritzkanal, erfolgt. Eine chemische Reaktion der Vorkomponenten zur Bildung des offenzelligen Kunststoffschaums findet dann im Wesentlichen innerhalb der geschlossenen Form statt, in die das zusammen gemischte noch flüssige Kunststoffrohmaterial eingespritzt wird. Dies ist eine sehr effiziente Herstellungsmethode für den bzw. die atmungsaktiven Teilbereich(e) des Arbeitsschutzschuhs.Another favorable embodiment is characterized by at least one breathable portion with an open-celled foamed Plastic material, wherein the breathable portion is injected. It is also possible to provide a plurality of such sprayed, breathable partial areas, each with an open-celled foamed plastic material. Such a protective work shoe can be produced in a particularly simple and cost-effective manner. The still liquid plastic material is injected in such a spraying process, in particular without pressure by means of an injection channel or injection slot in a preferably closed mold. This advantageously takes place at room temperature. The injected liquid plastic material consists in particular of a mixture of at least two precursors, wherein the mixing together of the at least two precomponents takes place shortly before the injection, preferably just before the injection channel. A chemical reaction of the precursors to form the open-cell plastic foam then takes place substantially within the closed mold into which the mixed still liquid plastic raw material is injected. This is a very efficient manufacturing method for the breathable part (s) of the work protection shoe.

Gemäß einer weiteren günstigen Ausgestaltung ist das offenzellige aufgeschäumte Kunststoffmaterial ein Polyurethan. Dieses Polyurethan ist vorzugsweise durch eine Reaktion einer Polyolkomponente, insbesondere eines Polyesterpolyols oder eines Polyetherpolyols, mit einer Isocyanatkomponente und mit mindestens einem zusätzlichen Vernetzer gebildet. Es ergibt sich die vorteilhafte atmungsaktive Ausgestaltung als offenzelliger Polyurethanschaum. Ein Anteil von mehr als 50 % der Schaumzellen ist dabei nicht geschlossen, sondern offenporig. Die Zellstege und Zellmembranen im Zellgerüst sind unterbrochen. Zwischen den einzelnen Schaumzellen und mit der Umgebung kann somit der bereits angesprochene Gasaustausch (insbesondere Luft-/Wasserdampfaustausch) mittels Strömung und/oder Diffusion stattfinden. Die offenen Schaumzellen kommen insbesondere dadurch zustande, dass die Wände zwischen den Zellstegen während des Aufschäumungsprozesses nicht intakt bleiben, sondern durch den während der chemischen Reaktion auftretenden Expansionsdruck zerstört werden. Das offenzellige aufgeschäumte Kunststoffmaterial aus Polyurethan hat insbesondere eine Shore-Härte A im Bereich von 35 bis 45, vorzugsweise zwischen 37 und 43, und besonders bevorzugt von etwa 40. Weiterhin hat das offenzellige aufgeschäumte Kunststoffmaterial aus Polyurethan insbesondere eine Dichte im Bereich von 0,25 g/cm3 bis 0,35 g/cm3, vorzugsweise zwischen 0,27 g/cm3 und 0,33 g/cm3 und besonders bevorzugt von 0,3 g/cm3. Diese Werte kommen bevorzugt, aber nicht nur, zum Einsatz, wenn die Schuhsohle einen mehrteiligen Aufbau mit einer Laufsohle und einer Zwischensohle aufweist und insbesondere die Zwischensohle aus oder mit dem offenzelligen aufgeschäumten Kunststoffmaterial ausgebildet ist. Alternativ kann das offenzellige aufgeschäumte Kunststoffmaterial aus Polyurethan aber insbesondere auch eine Shore-Härte A im Bereich von 45 bis 60 und vorzugsweise zwischen 50 und 55 haben. Ebenso kann das offenzellige aufgeschäumte Kunststoffmaterial aus Polyurethan insbesondere eine alternative Dichte im Bereich von 0,45 g/cm3 bis 0,6 g/cm3 und vorzugsweise zwischen 0,5 g/cm3 und 0,55 g/cm3 haben. Diese Werte kommen bevorzugt, aber nicht nur, zum Einsatz, wenn für die Schuhsohle ein Monomaterial, insbesondere in Form des offenzelligen aufgeschäumten Kunststoffmaterials, vorgesehen ist. Die Schuhsohle ist dann insbesondere einteilig aufgebaut und besteht bevorzugt nur aus einem einzigen Material, nämlich dem genannten offenzelligen aufgeschäumten Kunststoffmaterial. Der für die Härte bevorzugte Wertebereich des offenzelligen aufgeschäumten Kunststoffmaterials aus Polyurethan liegt also insbesondere bei einer Shore-Härte A im Bereich von 35 bis 60. Entsprechend liegt der für die Dichte bevorzugte Wertebereich des offenzelligen aufgeschäumten Kunststoffmaterials aus Polyurethan insbesondere im Bereich von 0,25 g/cm3 bis 0,6 g/cm3. Ein derartiger offenzelliger Polyurethanschaum bietet sowohl die für einen Arbeitsschutzschuh notwendige mechanische Stabilität als auch die gerade für einen im industriellen und/oder gewerblichen Bereich eingesetzten Arbeitsschutzschuh gewünschte Atmungsaktivität. Überraschenderweise hat sich dabei herausgestellt, dass insbesondere die genannten Polyurethanschäume diese beiden an und für sich konträren Eigenschaften aufweisen. Insbesondere sind die im Arbeitsschutzbereich unabdingbaren Schutzeigenschaften trotz der zusätzlich eingebrachten Atmungsaktivität weiterhin gegeben. Die Dichte und andere mechanischen Eigenschaften des offenzelligen Polyurethanschaums lassen sich bevorzugt durch das Mischungsverhältnis der Polyolkomponente und der Isocyanatkomponente und/oder durch die Wahl des Vernetzers entsprechend den jeweiligen Anforderungen einstellen. Somit eignet sich ein offenzelliger Polyurethanschaum besonders gut für einen Einsatz bei atmungsaktiven Teilbereichen eines Arbeitsschutzschuhes. Ein weiterer Vorteil des offenzelligen Polyurethanschaums besteht in seinem geringen Gewicht, wodurch sich der Tragekomfort des Arbeitsschutzschuhs zusätzlich erhöht.According to a further advantageous embodiment, the open-celled foamed plastic material is a polyurethane. This polyurethane is preferably formed by a reaction of a polyol component, in particular a polyester polyol or a polyether polyol, with an isocyanate component and with at least one additional crosslinker. The result is the advantageous breathable design as open-cell polyurethane foam. A proportion of more than 50% of the foam cells is not closed, but open-pored. The cell bridges and cell membranes in the cell framework are interrupted. Between the individual foam cells and with the environment can thus already mentioned gas exchange (In particular air / water vapor exchange) take place by means of flow and / or diffusion. The open foam cells are in particular due to the fact that the walls between the cell webs do not remain intact during the foaming process, but are destroyed by the expansion pressure occurring during the chemical reaction. In particular, the open-celled foamed plastic material made of polyurethane has a Shore A hardness in the range from 35 to 45, preferably between 37 and 43, and particularly preferably about 40. Furthermore, the open-cell foamed plastic material made of polyurethane has in particular a density in the range of 0.25 g / cm 3 to 0.35 g / cm 3 , preferably between 0.27 g / cm 3 and 0.33 g / cm 3 and more preferably of 0.3 g / cm 3 . These values are preferred, but not only, for use when the shoe sole has a multi-part construction with an outsole and a midsole, and in particular the midsole is formed from or with the open-celled foamed plastic material. Alternatively, however, the polyurethane open-cell foamed plastic material may in particular also have a Shore A hardness in the range from 45 to 60, and preferably between 50 and 55. Similarly, the open-cell foamed plastic material of polyurethane can, in particular, an alternative density in the range of 0.45 g / cm 3 to 0.6 g / cm 3 and preferably between 0.5 g / cm 3 and 0.55 g / cm 3. These values are preferably, but not only, used if a monomaterial, in particular in the form of the open-cell foamed plastic material, is provided for the shoe sole. The shoe sole is then in particular constructed in one piece and preferably consists only of a single material, namely the said open-celled foamed plastic material. The value range of the open-cell foamed plastic material of polyurethane which is preferred for the hardness is thus in the range from 35 to 60, in particular for a Shore hardness A. Accordingly, the preferred density range for the density of the open-celled foamed plastic material of polyurethane is in particular in the range from 0.25 g / cm 3 to 0.6 g / cm 3 . Such an open-cell polyurethane foam offers both the mechanical stability necessary for a protective work shoe and the desired breathability desired for a work protection shoe used in the industrial and / or commercial sector. Surprisingly, it has been found that in particular the said polyurethane foams have these two properties, which are in themselves contradictory. In particular, the protective properties indispensable in the field of occupational safety are still present despite the additionally introduced breathability. The density and other mechanical properties of the open-celled polyurethane foam can preferably be adjusted by the mixing ratio of the polyol component and the isocyanate component and / or by the choice of crosslinking agent according to the respective requirements. Thus, an open-celled polyurethane foam is particularly well suited for use in breathable areas of a protective work shoe. Another advantage of the open-cell polyurethane foam is its low weight, which further increases the wearing comfort of the work protection shoe.

Gemäß einer weiteren günstigen Ausgestaltung ist eine atmungsaktive Einlegesohle vorgesehen. Insbesondere kann die Einlegesohle aus oder mit einem atmungsaktiven Material, z.B. aus oder mit einen offenzelligen Kunststoffschaummaterial, insbesondere einem offenzelligen Polyurethanschaum, hergestellt sein. Alternativ kann die Atmungsaktivität aber auch auf andere Weise, insbesondere mittels einer geeigneten Perforation der Einlegesohle, herbeigeführt sein. Die atmungsaktive Ausführung der Einlegesohle stellt sicher, dass der vorteilhafte Gasaustausch zwischen dem Schuhinnenraum und der Umgebung insbesondere auch über die Schuhsohle erfolgen kann. Eine nicht atmungsaktive Einlegesohle würde dies dagegen zumindest erheblich erschweren, wenn nicht sogar vollständig unterdrücken. Insofern ist eine atmungsaktive Einlegesohle von besonderem Vorteil. Hierbei ist es günstig, wenn die dem Schuhinnenraum zugewandte Schicht der Schuhsohle, also insbesondere die Brandsohle, vorzugsweise ebenfalls aus oder mit einem offenzelligen Kunststoffschaummaterial hergestellt ist.According to another advantageous embodiment, a breathable insole is provided. In particular, the insole can be made of or with a breathable material, for example made of or with an open-cell plastic foam material, in particular an open-cell polyurethane foam. Alternatively, however, the breathability may also be brought about in another way, in particular by means of a suitable perforation of the insole. The breathable design of the insole ensures that the beneficial gas exchange between the Shoe interior and the environment can be done in particular on the shoe sole. On the other hand, a non-breathable insole would at least considerably complicate, if not completely suppress, this. In this respect, a breathable insole is of particular advantage. It is advantageous if the shoe interior facing the layer of the shoe sole, so in particular the insole, preferably also made of or with an open-cell plastic foam material.

Gemäß einer weiteren günstigen Ausgestaltung ist das aufgeschäumte Kunststoffmaterial mit einem antibakteriellen Additiv versehen. Insbesondere ist dieses Additiv homogen zugemischt. Das antibakterielle Additiv trägt dazu bei, den durch Fußschweiß hervorgerufenen ungenehmen Geruch zu reduzieren. Außerdem ist die Verwendung des antibakteriellen Additivs gerade dann von Vorteil, wenn es sich bei dem Arbeitsschutzschuh um einen im Medizinbereich eingesetzten Berufsschuh handelt. Bei dieser Anwendung kann das antibakterielle Additiv mit dazu beitragen, Bakterien, Keime, Viren oder dgl., die mit dem Arbeitsschutzschuh in Berührung kommen, abzutöten. Insbesondere ist das antibakterielle Additiv Silber oder umfasst Silber. Silber hat ein sehr gutes antibakterielles Verhalten und eignet sich deshalb besonders gut zur Zugabe in das aufgeschäumte Kunststoffmaterial des Arbeitsschutzschuhs.According to a further advantageous embodiment, the foamed plastic material is provided with an antibacterial additive. In particular, this additive is mixed homogeneously. The antibacterial additive helps reduce the unpleasant odor caused by foot sweat. In addition, the use of the antibacterial additive is especially advantageous when the work protection shoe is a professional shoe used in the medical field. In this application, the antibacterial additive may help to kill bacteria, germs, viruses or the like that come in contact with the occupational safety shoe. In particular, the antibacterial additive is silver or comprises silver. Silver has a very good antibacterial behavior and is therefore particularly well suited for addition to the foamed plastic material of the work protection shoe.

Gemäß einer weiteren günstigen Ausgestaltung ist es vorgesehen, dass in das Kunststoffmaterial als antibakterielles Additiv rein metallische Silber-Nanopartikel mit einer Größe von höchstens 20 nm gleichmäßig verteilt und fest eingebettet sind. Die geringe Größe der Silber-Nanopartikel bewirkt, dass die Zugabe dieses Additivs insbesondere bei der von außen sichtbaren Farbgestaltung des Arbeitsschutzschuhs nicht auffällt. Weiterhin führt die gleichmäßig verteilte und feste Einbettung der Silber-Nanopartikel in das aufgeschäumte Kunststoffmaterial dazu, dass ein praktisch unerschöpfliches und vor allem auch dauerhaftes Reservoir an biologisch aktiven Silberionen vorhanden ist. Die Silberionen entstehen durch laufende Oxidation an der Oberfläche der Silber-Nanopartikel aufgrund einer in der normalen Umgebungsluft ohnehin stets enthaltenen (Rest-)Feuchtigkeit. Die so gebildeten Silberionen gelangen an die äußere Oberfläche des Arbeitsschutzschuhs und töten dort Bakterien und/oder Viren ab, womit die antibakterielle Wirkung des Additivs begründet ist. Aufgrund der festen Einbettung in das aufgeschäumte Kunststoffmaterial lassen sich die Silber-Nanopartikel nicht auswaschen, so dass die vorteilhafte antibakterielle Wirkung dauerhaft gegeben ist. Die eingebetteten Silber-Nanopartikel unterstützen außerdem auch das antistatische Verhalten. Sie tragen zumindest mit dazu bei, unerwünschte statische Aufladungen des Schuhträgers zu verhindern.According to another advantageous embodiment, it is provided that purely metallic silver nanoparticles with a size of at most 20 nm are evenly distributed and firmly embedded in the plastic material as antibacterial additive. The small size of the silver nanoparticles means that the addition of this additive is not noticeable, especially in the externally visible color design of the industrial safety shoe. Farther The uniformly distributed and strong embedding of the silver nanoparticles in the foamed plastic material leads to a virtually inexhaustible and, above all, permanent reservoir of biologically active silver ions. The silver ions are formed by continuous oxidation on the surface of the silver nanoparticles due to a (residual) moisture always present in the normal ambient air. The silver ions thus formed reach the outer surface of the protective work shoe and kill off bacteria and / or viruses, thus substantiating the antibacterial effect of the additive. Due to the solid embedding in the foamed plastic material, the silver nanoparticles can not be washed out, so that the beneficial antibacterial effect is permanent. The embedded silver nanoparticles also support antistatic behavior. At least they help to prevent unwanted static charges of the shoe wearer.

Gemäß einer weiteren günstigen Ausgestaltung ist unten an der Schuhsohle ein Fersenschutzeinsatz vorgesehen. Der Fersenschutzeinsatz erfüllt bevorzugt eine Schutzfunktion, bei der die Atmungsaktivität im Bereich des Fersenschutzeinsatzes eine insbesondere nur untergeordnete Rolle spielt. Vorzugsweise ist für den Fersenschutzeinsatz insofern ein nicht atmungsaktives Material vorgesehen, beispielsweise ein anderes Polyurethan, wie zum Beispiel ein elastomeres Polyurethan, oder ein thermoplastisches Polyurethan oder ein Gummimaterial. Gegebenenfalls kann der Fersenschutzeinsatz auch anders eingefärbt sein als der Rest der Schuhsohle, insbesondere um die spezifische (Schutz-)Funktion auch optisch hervorzuheben.According to a further advantageous embodiment, a heel protection insert is provided at the bottom of the shoe sole. The heel protection insert preferably fulfills a protective function in which the breathability in the area of the heel protection insert plays a particularly minor role. Preferably, a non-breathable material is provided for the heel protector insert, for example, another polyurethane, such as an elastomeric polyurethane, or a thermoplastic polyurethane or a rubber material. Optionally, the heel protector insert may also be colored differently than the rest of the shoe sole, in particular to highlight the specific (protective) function also visually.

Weitere Merkmale, Vorteile und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung von Ausführungsbeispielen anhand der Zeichnung. Die einzige Figur zeigt ein Ausführungsbeispiel eines aus oder mit offenzelligem, aufgeschäumtem Kunststoffmaterial hergestellten atmungsaktiven Arbeitsschutzschuhs.Further features, advantages and details of the invention will become apparent from the following description of exemplary embodiments the drawing. The sole FIGURE shows an exemplary embodiment of a breathable work protection shoe made of or with open-cell, foamed plastic material.

Auch Einzelheiten der im Folgenden näher erläuterten Ausführungsbeispiele können für sich genommen eine Erfindung darstellen oder Teil eines eigenen Erfindungsgegenstands sein.Also details of the embodiments explained in more detail below may constitute an invention in itself or be part of a separate subject of the invention.

Bei dem in der Figur gezeigten Ausführungsbeispiel handelt es sich um einen Arbeitsschutzschuh 1 in Form eines Sicherheitsschuhs. Der Arbeitsschutzschuh 1 umfasst mehrere von außen sichtbare Teilbereiche, insbesondere eine Schuhsohle 2, eine Zehenkappe 3 und einen Schaftbereich 4. Die Schuhsohle 2 setzt sich ihrerseits zusammen aus einer Zwischensohle 5 und einer Laufsohle 6, die einen Fersenschutzeinsatz 7 umfasst. Außerdem hat die Schuhsohle 2 eine Sohlenaußenfläche 8. Der Fersenschutzeinsatz umfasst außer der Komponente, die eine in der Figur sichtbare Kappenaußenfläche 9 bildet, zumindest auch einen in der Figur nicht sichtbaren, dem Schutz der Zehen dienenden, stoßfesten Kappeneinsatz, wie dies oftmals bei einem Sicherheitsschuh üblich ist. Der Schaftbereich 4 hat eine Schafftaußenfläche 10.In the embodiment shown in the figure is a safety shoe 1 in the form of a safety shoe. The occupational safety shoe 1 comprises a plurality of externally visible partial regions, in particular a shoe sole 2, a toe cap 3 and a shaft region 4. The shoe sole 2 is itself composed of a midsole 5 and an outsole 6 which comprises a heel protection insert 7. In addition, the shoe sole 2 has a sole outer surface 8. The heel protection insert comprises in addition to the component which forms a visible in the figure cap outer surface 9, at least also not visible in the figure, the protection of the toes serving, shockproof cap insert, as often in a safety shoe is common. The shaft region 4 has a work outer surface 10.

Der Arbeitsschutzschuh 1 ist atmungsaktiv ausgestaltet. Hierzu ist zumindest die Schuhsohle 2 mittels eines offenzelligen Kunststoffschaummaterials realisiert, wobei mindestens 10 % der Sohlenaußenfläche 8 dieses offenzellige Kunststoffschaummaterial enthält. Bei einem ersten Ausführungsbeispiel ist für die Zwischensohle 5 ein solches offenzelliges Kunststoffschaummaterial vorgesehen. Bei diesem Material handelt es sich um einen Polyurethanschaum mit einer Shore-Härte A von etwa 40 und einer Dichte von etwa 0,3 g/cm3. Aufgrund der Offenzelligkeit bzw. Offenporigkeit des Polyurethanschaums ist ein vorteilhafter Gasaustausch zwischen einem Schuhinnenraum und der Umgebung gewährleistet, wodurch die Atmungsaktivität des Arbeitsschutzschuhs 1 insgesamt resultiert. Es hat sich herausgestellt, dass die wie vorstehend erläutert atmungsaktiv ausgestaltete Zwischensohle 5 ausreicht, um einen sehr guten Gasaustausch herbeizuführen.The work protection shoe 1 is made breathable. For this purpose, at least the shoe sole 2 is realized by means of an open-cell plastic foam material, wherein at least 10% of the sole outer surface 8 contains this open-cell plastic foam material. In a first embodiment, such an open-cell plastic foam material is provided for the midsole 5. This material is a polyurethane foam having a Shore A hardness of about 40 and a density of about 0.3 g / cm 3. Due to the open-celledness or open porosity the polyurethane foam ensures an advantageous gas exchange between a shoe interior and the environment, whereby the overall breathability of the work protection shoe 1 results. It has been found that the breathable designed as described above midsole 5 is sufficient to bring about a very good gas exchange.

Bei einem zweiten günstigen Ausführungsbeispiel ist außer für die Zwischensohle 5 auch für die Laufsohle 6 - gegebenenfalls abgesehen von dem Fersenschutzeinsatz 7 und/oder anderen nicht näher gezeigten besonderen (Schutz-) Einsätzen - ein offenzelliges Kunststoffschaummaterial, und insbesondere wiederum ein offenzelliger Polyurethanschaum, vorgesehen. Dadurch steht zumindest ein Teil der durch die Laufsohle 6 gebildeten Lauffläche des Arbeitsschutzschuhes 1 ebenfalls für den Gasaustausch zur Verfügung, wodurch die Atmungsaktivität des Arbeitsschutzschuhs 1 weiter verbessert wird. Es hat sich gezeigt, dass auch die Laufsohle 6 aus einem in Bezug auf die Atmungsaktivität sehr günstigen offenzelligen Polyurethanschaum hergestellt werden kann, ohne dass die für den Arbeitsschutzschuh 1 erforderlichen anderweitigen Eigenschaften, wie beispielsweise mechanische Stabilität, Stoßfestigkeit, Schnittfestigkeit, chemische Stabilität und Rutschfestigkeit, maßgeblich beeinträchtigt werden. Diese für den Arbeitsschutzschuh 1 wichtigen Haupteigenschaften sind auch bei dem hier vorgesehenen besonderen offenzelligen Polyurethanschaum nach wie vor gegeben.In a second favorable embodiment, except for the midsole 5 and the outsole 6 - optionally apart from the heel protection insert 7 and / or other special (protective) inserts not shown in detail - an open-cell plastic foam material, and in turn an open-cell polyurethane foam provided. As a result, at least part of the running surface of the protective work shoe 1 formed by the outsole 6 is likewise available for the gas exchange, as a result of which the breathability of the protective work shoe 1 is further improved. It has also been found that the outsole 6 can also be produced from an open-cell polyurethane foam which is very favorable in terms of breathability, without the other properties required for the occupational safety shoe 1, such as, for example, mechanical stability, impact resistance, cut resistance, chemical stability and skid resistance, be significantly affected. These main properties which are important for the occupational safety shoe 1 are still given in the case of the special open-cell polyurethane foam provided here.

Bei einem dritten Ausführungsbeispiel ist außer für die Zwischensohle 5 und/oder für die Laufsohle 6 auch zumindest für die die Kappenaußenfläche 9 bildende Komponente der Zehenkappe 3 ein offenzelliges Kunststoffschaummaterial, und wiederum insbesondere ein offenzelliger Polyurethanschaum, vorgesehen. Damit weist auch die Zehenkappe 3 eine günstige Atmungsaktivität auf.In a third embodiment, except for the midsole 5 and / or for the outsole 6 and at least for the cap outer surface 9 forming component of the toe cap 3 is an open-cell plastic foam material, and in particular an open-cell polyurethane foam, intended. Thus, the toe cap 3 has a favorable breathability.

Schließlich ist es im Rahmen eines weiteren Ausführungsbeispiels möglich, dass außer für die Zwischensohle 5 und/oder für die Laufsohle 6 und/oder für die Zehenkappe 3 auch für den Schaftbereich 4 ein offenzelliges Kunststoffschaummaterial, und insbesondere wiederum ein offenzelliger Polyurethanschaum, vorgesehen ist. Dadurch ist auch der Schaftbereich 4 vorteilhafterweise atmungsaktiv.Finally, it is possible within the scope of a further embodiment that, except for the midsole 5 and / or for the outsole 6 and / or for the toe cap 3, an open-cell plastic foam material, and in particular an open-cell polyurethane foam, is also provided for the shaft region 4. As a result, the shaft region 4 is advantageously also breathable.

Damit können zumindest praktisch alle wesentlichen von außen sichtbaren Teilbereiche des Arbeitsschutzschuhs 1 aus oder mit einem atmungsaktiven Kunststoffmaterial, nämlich insbesondere einem offenzelligen Polyurethanschaum hergestellt sein. Die gegebenenfalls verbleibenden, nicht atmungsaktiven Teilbereiche bestehen vorteilhafterweise ebenfalls aus einem Kunststoffmaterial. Insgesamt resultiert dann ein Arbeitsschutzschuh, der praktisch fast vollständig aus Kunststoffmaterialien hergestellt ist und sich damit verglichen mit einem konventionellen Arbeitsschutzschuh deutlich einfacher und günstiger fertigen lässt. Trotz dieses Fertigungsvorteils ist aber nach wie vor ein hoher Tragekomfort gegeben, da aufgrund der günstigen Kunststoffmaterialwahl, insbesondere in Form des offenzelligen Polyurethanschaums, ein sehr guter Gasaustausch mit der Umgebung gegeben ist. Die vorstehend im Einzelnen angesprochenen Teilbereiche des Arbeitsschutzschuhs 1, also die Zwischensohle 5, die Laufsohle 6, die Zehenkappe 3 und der Schaftbereich 4, können dabei jeweils mit einem offenzelligen Kunststoffmaterial realisiert sein, das in den einzelnen Teilbereichen gleich oder unterschiedlich ausgebildet ist. Bei der unterschiedlichen Ausbildung kann die atmungsaktiven Kunststoffmaterialien zwar jeweils vom gleichen Grundmaterialtyp, also insbesondere vom Polyurethan-Typ, sein, aber an den jeweiligen Teilbereich angepasste verschiedene Mischungsverhältnisse oder verschiedene Ausprägungen der Material-Vorkomponenten aufweisen. So können insbesondere die in den einzelnen Teilbereichen zur Polyurethanschaum-Herstellung jeweils vorgesehenen Polyolkomponenten und Isocyanatkomponenten in unterschiedlicher Konzentration vorliegen und/oder sich voneinander unterscheiden.Thus, at least virtually all of the visible parts of the work protection shoe 1 visible from the outside can be made of or with a breathable plastic material, namely in particular an open-celled polyurethane foam. The optionally remaining, non-breathable portions are advantageously also made of a plastic material. Overall, then results in a protective work shoe, which is practically almost completely made of plastic materials and thus much easier and cheaper to manufacture compared with a conventional safety shoe. Despite this manufacturing advantage, however, a high level of comfort is still given, since due to the favorable choice of plastic material, in particular in the form of open-cell polyurethane foam, a very good gas exchange with the environment is given. The subsections of the occupational safety footwear 1 mentioned above in detail, that is to say the midsole 5, the outsole 6, the toe cap 3 and the shaft area 4, can each be realized with an open-cell plastic material which is identical or different in the individual partial areas. Although the breathable plastic materials may in each case be of the same type of base material, that is to say in particular of the polyurethane type, be, but adapted to the respective sub-range different mixing ratios or different characteristics of the material precursors have. Thus, in particular, the polyol components and isocyanate components provided in each subarea for polyurethane foam preparation can be present in different concentrations and / or differ from one another.

Trotzdem lässt sich der Arbeitsschutzschuh 1 mittels gängiger Kunststoff-Herstellungsmethoden fertigen. Insbesondere ist er als einfaches Spritzteil ausgebildet. Dies vereinfacht den Herstellungsprozess verglichen mit konventionellen Arbeitsschutzschuhen erheblich.Nevertheless, the work protection shoe 1 can be manufactured by means of common plastic production methods. In particular, it is designed as a simple molded part. This considerably simplifies the manufacturing process compared to conventional protective work shoes.

Weiterhin ist es möglich, dass dem offenzelligen Kunststoffschaummaterial mindestens ein antibakterielles Additiv, insbesondere in Form metallischer Silber-Nanopartikel, zugemischt ist. Die Silber-Nanopartikel sind bevorzugt gleichmäßig verteilt innerhalb des offenzelligen Kunststoffschaummaterials angeordnet und außerdem auch fest in die Matrix des offenzelligen Kunststoffschaummaterials eingebettet.Furthermore, it is possible that the open-cell plastic foam material at least one antibacterial additive, in particular in the form of metallic silver nanoparticles, is mixed. The silver nanoparticles are preferably uniformly distributed within the open-cell plastic foam material and also embedded firmly in the matrix of the open-cell plastic foam material.

Zur weiteren Verbesserung der Atmungsaktivität des Arbeitsschutzschuhs 1 ist außerdem auch eine in der Figur nicht gezeigte atmungsaktive Einlegesohle vorgesehen, die beispielsweise ebenfalls aus einen offenzelligen Kunststoffschaummaterial, insbesondere einem offenzelligen Polyurethanschaum, hergestellt sein kann.To further improve the breathability of the protective work shoe 1, a breathable insole not shown in the figure is also provided, which may for example also be made of an open-cell plastic foam material, in particular an open-cell polyurethane foam.

Der je nach Ausgestaltung in praktisch allen Teilbereichen des Arbeitsschutzschuhs 1 mögliche Gasaustausch zwischen dem Schuhinnenbereich und der Umgebung ist in der Figur durch Doppelpfeile 11 angedeutet. Der Gasaustausch findet dabei insbesondere als Luft- und/oder Wasserdampfaustausch statt. Die eingesetzten offenzelligen Kunststoffschaummateralien haben eine Durchlässigkeit für diese gasförmigen Komponenten. Der Arbeitsschutzschuh 1 hat also einerseits aufgrund der günstigen Atmungsaktivität einen hohen Tragekomfort. Andererseits lässt er sich sehr einfach mittels eines Spritzverfahrens herstellen. Insbesondere letzteres ist bei bislang bekannten Arbeitsschutzschuhen, die auch eine gewisse Atmungsaktivität aufweisen, nicht vorgesehen.Depending on the configuration, gas exchange between the shoe inner region and the environment, which is possible in virtually all subsections of the protective work shoe 1, is indicated in the figure by double arrows 11. The gas exchange takes place in particular as air and / or steam exchange instead of. The open-cell plastic foam materials used have a permeability to these gaseous components. The safety shoe 1 therefore has a high wearing comfort on the one hand because of the favorable breathability. On the other hand, it can be produced very easily by means of a spraying process. In particular, the latter is not provided in hitherto known safety shoes, which also have a certain breathability.

Claims (14)

  1. Industrial safety shoe for protection against accidents, comprising a shoe sole (2) with a sole outer surface (8), wherein
    a) the shoe sole (2) is breathable and at least partly comprises a foamed plastic material so that at least 10 % of the sole outer surface (8) exhibits said foamed plastic material, wherein the foamed plastic material contains foam cells, with a percentage of more than 50 % thereof having an open-cell structure so that the plastic material is gas-permeable, and
    b) a percentage of more than 50 % of the portions (2, 3, 4, 5, 6), visible from outside, of the industrial safety shoe (1) is breathable and made of at least one open-cell foamed plastic material.
  2. Industrial safety shoe according to claim 1, characterised in that the shoe sole (2) has a multi-layer structure comprising an outsole (6) and a midsole (5), and at least the midsole (5) comprises the open-cell foamed plastic material.
  3. Industrial safety shoe according to claim 2, characterised in that the outsole (6) comprises an open-cell foamed plastic material as well.
  4. Industrial safety shoe according to one of the preceding claims, characterised in that a breathable toe box (3) is provided which at least partly comprises an open-cell foamed plastic material, wherein in particular at least a portion of a box outer surface (9) of the toe box (3) is made with the open-cell foamed plastic material.
  5. Industrial safety shoe according to one of the preceding claims, characterised in that a breathable upper region (4) is provided which at least partly comprises an open-cell foamed plastic material, wherein in particular at least a portion of an upper outer surface (10) of the upper region (4) is made with the open-cell foamed plastic material.
  6. Industrial safety shoe according to one of the preceding claims, characterised in that a percentage of more than 55 %, preferably of more than 90 %, of the portions (2, 3, 4, 5, 6), visible from outside, of the industrial safety shoe (1) is breathable and made of at least one open-cell foamed plastic material.
  7. Industrial safety shoe according to one of the preceding claims, characterised in that the portions (7) of the industrial safety shoe (1) that are visible from outside and are non-breathable are made of another plastic material.
  8. Industrial safety shoe according to one of the preceding claims, characterised by at least one breathable portion (2, 3, 4, 5, 6) comprising an open-cell foamed plastic material, wherein the breathable portion (2, 3, 4, 5, 6) is injection-moulded.
  9. Industrial safety shoe according to one of the preceding claims, characterised in that the open-cell foamed plastic material is a polyurethane.
  10. Industrial safety shoe according to one of the preceding claims, characterised in that a breathable insole is provided.
  11. Industrial safety shoe according to one of the preceding claims, characterised in that the foamed plastic material is provided with an antibacterial additive.
  12. Industrial safety shoe according to claim 11, characterised in that the antibacterial additive is or comprises silver.
  13. Industrial safety shoe according to claim 11 or 12, characterised in that pure elemental silver nanoparticles serving as antibacterial additive are evenly distributed and firmly embedded in the plastic material, the silver nanoparticles having a size of at most 20 nm.
  14. Industrial safety shoe according to one of the preceding claims, characterised in that the lower side of the shoe sole (2) is provided with a heel protection insert (7).
EP20130189837 2012-10-29 2013-10-23 Breathable industrial safety shoe Not-in-force EP2724635B1 (en)

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US11926115B2 (en) 2018-05-08 2024-03-12 Puma SE Method for producing a sole of a shoe, in particular of a sports shoe

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