Classifications

• • A—HUMAN NECESSITIES
  • A43—FOOTWEAR
  • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
  • A43B17/00—Insoles for insertion, e.g. footbeds or inlays, for attachment to the shoe after the upper has been joined
  • A43B17/003—Insoles for insertion, e.g. footbeds or inlays, for attachment to the shoe after the upper has been joined characterised by the material
  • A43B17/006—Insoles for insertion, e.g. footbeds or inlays, for attachment to the shoe after the upper has been joined characterised by the material multilayered

Definitions

• the present invention relates to two-layer insoles in which the first layer has at least one recess which is filled by material of the second layer.
• Insoles are separate inner soles that are placed in shoes for comfort or orthopedic reasons.
• the most common type of insole is the shoe insert, which is mass-produced industrially and offered in various shoe sizes. Insoles are frequently used for medical, especially orthopedic, reasons, but also in sports. Orthopedic insoles are often custom-made by an orthopedic shoemaker to fit the individual foot according to the medical indication, as they are intended to support the foot or correct misalignments.
• insoles are being offered, featuring, for example, a raised metatarsal pad for transverse arch support, arch support for the medial border of the sole, and a depression for the heel, often with additional pressure-absorbing pads or inserts under the heel bone.
• Insoles are also known where the surface consists of materials of varying hardness in different areas. Such insoles are made, for example, from... DE 20 2005 018 902 U1 , the DE 20 2005 019 691 U1 , the DE 10 2014 102 628 A1 , the DE 10 2009 060 933 A1 and the DE 10 2012 021 696 A1 known.
• the technical problem underlying the present invention is the provision of multi-layered insoles in which one layer partially extends into the other layer. and a surface that is as continuous as possible is formed from the two layers.
• the production of these insoles should be as simple as possible, preferably eliminating the need for material removal to level the layers.
• the insole should be manufactured using a simple thermoforming process.
• Another technical challenge is providing an insole with zones of varying hardness, while ensuring a continuous and therefore comfortable footbed.
• the insole should be three-dimensionally deformable.
• the present invention solves the underlying technical problem by means of the subject matter according to claim 1.
• insoles can be provided in which cutouts in the first layer, for example the layer facing the sole of the foot, can be easily filled by material from the second layer, for example the layer underneath, and still create a smooth, continuous surface.
• the insole is manufactured using a thermoforming process.
• the cutouts for the first layer are created during the cutting process, for example, by die-cutting.
• the two layers are then bonded together with an adhesive film.
• the insole is not only given its three-dimensional shape, but the cutouts in the first layer are also filled with material from the second layer, resulting in a surprisingly smooth surface.
• the boundary between the first and second layers is very even and barely perceptible, if at all, to the sole of the foot.
• the first layer is at least partially bonded to the second layer via an adhesive film.
• the The adhesive film is a polymer adhesive film.
• the adhesive film is a thermoplastic adhesive film.
• a film of the adhesive film is used.
• thermoplastic polymer adhesive films are known to those skilled in the art.
• a thermoplastic adhesive film based on modified polyolefins is particularly preferred.
• the melting point of the adhesive film is preferably below 140 °C, and particularly preferably below 100 °C.
• the chemical base of the adhesive film is preferably EVA (ethylene-vinyl acetate copolymer), LDPE (low-density polyethylene), HDPE (high-density polyethylene), CoPA (polyamide block copolymer), TPU (thermoplastic polyurethane), or CoPES (copolyester).
• the adhesive film contains at least one of these substances.
• the adhesive film contains EVA and/or LDPE and/or HDPE.
• the chemical base of the adhesive film is particularly preferred.
• the base of the adhesive film can also consist of mixtures of the aforementioned substances.
• the adhesive film has a thickness of no more than 0.5 mm.
• the adhesive film is a foil that is applied to the first layer and/or the second layer during the manufacturing of the insole.
• the first and second layers could be bonded with an adhesive film in such a way that they are not only permanently attached to each other, but can also be deep-drawn, and in particular, deep-drawn to such an extent that the material of the second layer penetrates and fills the recesses of the first layer.
• the existing adhesive film thus enables not only a permanent bond between the two layers, but also the production of the final product in a deep-drawing process in which the recesses of the first layer are filled by the second layer, and a three-dimensional shaping of both layers is simultaneously possible.
• no adhesive film is present in the recesses.
• the first layer and the material in the recess of the first layer form a closed, continuous surface.
• a closed, continuous surface is understood to mean, in particular, a surface where none of the layers protrudes beyond the other layer.
• the surface can be flat or, in the case of a three-dimensionally shaped insole, curved.
• the surface has very narrow indentations at the interface between the material of the first layer and the material of the second layer. These indentations do not impair wearing comfort, however, as they are so small that they are not felt by the sole of the foot.
• the insole is shaped three-dimensionally.
• Suitable three-dimensional shapes for an insole are known to those skilled in the art.
• arch supports can be provided.
• the first and second layers are three-dimensionally shaped.
• all layers are three-dimensionally shaped.
• the first layer has several recesses which are filled by material of the second layer, in particular two recesses, three recesses, four recesses, five recesses or six recesses.
• the first layer is the layer facing the foot.
• the second layer is preferably located beneath the first layer and is therefore the layer facing the shoe sole.
• both the first layer and the material of the second layer, which fills the recesses of the first layer face the foot. Therefore, when using the insole according to the invention, the foot preferably rests on a surface that consists partly of material from the first layer and partly of material from the second layer.
• the material of the first layer has a different Shore hardness A than the material of the second layer.
• the material of the first layer is harder than the material of the second layer, particularly if the first layer is the layer facing the foot.
• the first layer forms the harder base layer on which the foot rests, with recesses in which the softer material of the second layer is located, thus creating a softer area of the insole within the recessed section. Therefore, by positioning the recesses in the first layer, specific softer areas can be formed within the insole. Such areas are particularly suitable for relieving pressure on the foot at specific points and/or reducing pressure pain.
• the first layer is made of a softer material than the second layer, for example if specific harder stabilization points are to be formed.
• the material of the first layer has a Shore hardness of at least 40 Shore A.
• the material of the second layer has a Shore hardness of at most 35 Shore A.
• the material of the first layer has a Shore hardness of at least 30 Shore A up to a maximum of 60 Shore A, preferably at least 35 Shore A and at most 55 Shore A, and particularly preferably at least 40 Shore A.
• the material of the second layer has a Shore hardness of at least 15 Shore A.
• the material of the second layer has a Shore hardness of at least 15 Shore A and at most 40 Shore A, preferably at least 20 Shore A and at most 33 Shore A, and particularly preferably at least 25 Shore A and at most 30 Shore A.
• the material of the second layer has a Shore hardness of at most 30 Shore A.
• the layer thickness of the first layer is less than the layer thickness of the second layer.
• the thickness of the first layer is at least 0.5 mm.
• the thickness of the first layer is at most 3.5 mm, preferably
• the thickness of the second layer is at most 2 mm.
• the thickness of the second layer, particularly in the area without recesses in the first layer is at least 2 mm, and more preferably at least 3 mm.
• the thickness of the second layer is more preferably at most 6 mm, and more preferably at most 5 mm.
• the material of the first layer and/or the material of the second layer is a thermoplastic.
• the material of the first layer and/or the material of the second layer is a cross-linked polyolefin foam.
• the material of the first layer and the material of the second layer are suitable for deep drawing. Such materials are known to those skilled in the art.
• the material of the first layer and/or the material of the second layer is a polyethylene foam or a foam containing polyethylene.
• the insole has a third layer made of a third material.
• the insole has a fourth layer made of a fourth material.
• a person skilled in the art can provide further layers that also form the insole.
• a third layer can be provided on the side of the second layer facing away from the first layer, preferably a layer made of a material with a higher Shore hardness, and particularly preferably a layer for stiffening and stabilizing.
• This layer can preferably be used to stabilize the midfoot and/or hindfoot and thus to support corrective measures for foot deformities.
• the third layer consists of a moistened textile fabric.
• a fourth layer can be provided, which preferably consists of a cross-linked polyolefin foam, wherein the material of the fourth layer particularly preferably has a Shore hardness that is higher than the Shore hardness of the material of the first layer. layer and/or the material of the second layer.
• the third layer is particularly preferably located between the second and fourth layers. In an alternative embodiment, the third layer can be omitted.
• the material of the third layer and/or the material of the fourth layer has a higher Shore hardness A than the material of the first layer and/or the material of the second layer. In a preferred embodiment, the material of the third layer has a higher Shore hardness A than the material of the first layer and the material of the second layer.
• the materials of the individual layers in particular the material of the first layer and the material of the second layer, have different colors.
• the different colors make the material boundaries easily visible.
• the materials of the individual layers can also be the same color. If visual differentiation of the layers is desired, one or more layers can be made of a perforated material. The perforation of the layers can also be designed differently.
• the second layer is made of a perforated material, but particularly preferably not the first layer.
• the insole is an orthopedic shoe insert or a sports insole.
• Figure 1 shows an insole 100 according to the invention in an oblique view. Visible is the upper first layer 10, which faces the foot and is made of a harder foam; the second layer 20, which is made of a softer foam; and the fourth layer 40, which, when used, faces the sole of the shoe and is made of a foam that is harder than the foam of the first layer. Between the second layer 20 and the fourth layer 40 lies a very thin and therefore barely visible third layer 30 made of a moistened textile fabric.
• the insole 100 has a typical three-dimensional shape, which was produced by a thermoforming process.
• the upper, first layer 10 has four recesses 11. These recesses 11 are filled by material 21 of the second layer 20.
• a first surface 101 is formed for the foot, which is advantageously continuous even though it is formed from two different materials: the material of the first layer 10, which comprises material 21 of the second layer 20.
• the boundary between the two materials is nevertheless barely perceptible or not at all.
• the recesses 11 in the first layer 10 advantageously create zones that are softer than the other areas of the insole 100 due to the filling material 21 of the second layer 20, so that pressure on the foot is relieved in these zones and/or pressure pain is avoided.
• Figure 2 This shows the layer structure of the insole 100 in the edge area, i.e., in an area without cutouts in the first layer 10. Accordingly, the first layer 10, the second layer 20 below it, the third layer 30 below it, and the bottom layer 40 are visible.
• the thickness of the first layer 10 is approximately 1 mm
• the thickness of the second layer 20 approximately 4 mm
• the thickness of the third layer 30 less than 1 mm
• the thickness of the fourth layer 40 approximately 4 mm.
• an adhesive film 50 which connects the respective layers together, since the corresponding adhesive film is very thin at 0.1 mm and melts due to heat treatment during bonding.

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• Life Sciences & Earth Sciences (AREA)
• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Wood Science & Technology (AREA)
• Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)

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• 2020
  • 2020-05-22 DE DE102020206397.4A patent/DE102020206397A1/de active Pending
• 2021
  • 2021-04-30 TW TW110115762A patent/TW202143877A/zh unknown
  • 2021-05-17 WO PCT/EP2021/063003 patent/WO2021233830A1/de not_active Ceased
  • 2021-05-17 DK DK21727419.0T patent/DK4152998T3/da active
  • 2021-05-17 EP EP21727419.0A patent/EP4152998B1/de active Active
  • 2021-05-17 FI FIEP21727419.0T patent/FI4152998T3/fi active

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