DE3600682A1 - SHOE WITH A MIDSOLE MADE OF POLYURETHANE AND AN OUTSOLE MADE OF ELASTOMER - Google Patents

Description

The invention relates to a shoe with a midsole made of polyurethane and an outsole made of elastomer, as well a method and an apparatus including molds for its manufacture.

Shoes with a midsole on polyurethane and one Outsole also made of polyurethane are known (DE-PS 22 41 493). For their manufacture come in general rotary table systems used, the several Have workstations with shapes.

Shapes consist of two side moldings, one Ground stamp, a counter stamp and a last.

Because of the low viscosity of the polyurethane it is required in a first spray cycle using the side moldings the bottom stamp and the counter stamp the outsole to inject, proceeding in such a way that First the side moldings, the bottom stamp and the counter stamp limit a mold cavity, its volume is greater than the volume of the outsole. After insertion a mixture reacting to the outsole this limited volume of the outsole is reduced.

Then the counter-stamp is applied by the last a listed shaft to form another Mold cavity replaced, the volume of which is greater than the volume of the midsole. After the introduction of the This volume becomes a mixture to form the midsole reduced to the volume of the midsole. The Introducing the mixture for the outsole and the Mixtures for the midsole are made in two different workstations.  

The mixtures for the outsole that react to polyurethane and for the midsole essentially have polyol and Isocyanate and chain extenders and catalysts on the depending on the material properties required for the outsole or midsole - the outsole should be wear-resistant, the Midsole be elastic and have a pore structure - are set by appropriate additives.

When mixing the components for these mixtures already set the chemical reactions. The mixtures react in the injection molds to the outsole or midsole out. When the mixture reacts for the midsole the midsole and the connection are formed at the same time achieved with the upper and the sole.

Because of the chemical reactions that start when mixing precautions must be taken at these workstations so that the corresponding quantity without interruptions the mixtures are fed to the corresponding mold cavities can be (see, for example, DE-PS 20 62 008).

Because of the very low viscosity of those that react to polyurethane Mixtures are also special precautions to meet, there is a risk that immediately introduced Material can escape from the tool. To this Purposes, it is known to design the injection molds in such a way that a targeted expulsion of the material is achieved (see DE-PS 20 22 118, DE-AS 20 48 596).

In the following, the invention relates to shoes and their midsoles made from mixtures reacting to polyurethane be a process for their manufacture, as well a device and molds for carrying out the Procedure.

Shoes with a polyurethane midsole and an outsole made of elastomer are known and are manufactured in the following way:

• 1. Unite sole
  The elastomer sole is provided with an adhesive layer and glued to a foamed midsole.
• 2. Direct soles
  The adhesive-coated elastomer sole is z. B. activated infrared light, then the midsole is introduced as a connection, shaft-elastomer sole.

These procedures are costly and time consuming. However, the manufacturing problems are serious, there z. B. compliance with this adhesive layer with a layer thickness 20 to 30 microns cannot be guaranteed.

In cases where the adhesive layer is thicker, occur after some wear of these shoes adhesive cracks in the Adhesive layer on that separates the outsole from the midsole have as a consequence. Corresponding problems occur when the adhesive layer is applied too thinly, because then a continuous Adhesive connection is not created, causing the The service life of such shoes is also reduced.

A molding of the outsole made of elastomers also fails the midsole molded from polyurethane in general Tool that the pressures when processing elastomers 200 to 500 bar, under which the midsole is such would be highly compressed, that of elastic midsoles (Comfort soles), which generally consist of blowing agents Mixtures are produced, can no longer be the question.

Injection of plasticized elastomer is prohibited also because its processing temperatures are in the range from 140 to 230 ° C and at these temperatures they are already molded midsoles made of polyurethane in their structure would be destroyed.

The mixture which has reacted to give polyurethane forms a matrix with embedded crystallites, the temperature resistance essentially from the chain extenders used is determined. When using diamines as a chain extender the melting temperature of the polyurethane is about 150 ° C, while using butanediols as chain extenders the melting temperature is around 130 ° C.  

If this respective melting point is exceeded, it softens the polyurethane and gets a greasy consistency, so that from a dimensional stability of the injected sole Polyurethane can no longer be talked about, which is also the would be exposed to high processing pressures of the elastomer.

For these reasons, the known methods also fail Processing of mixtures reacting to polyurethane, if first the outsole and then the midsole will (DE-PS 22 41 493).

The invention has for its object a shoe a polyurethane midsole and an outsole To create elastomer with a permanent connection between midsole and outsole even under extreme Conditions and longer service life is ensured.

The invention is also based on the object of a method to form these soles on shoe uppers, as well as a Device and molds for performing the method create.

The task of a shoe with a polyurethane midsole and a molded elastomer outsole create, is achieved in that the outsole Made of elastomer, the substances with reactive end groups has, and the midsole from a to polyurethane out-reacting mixture is sprayed and the sprayed Midsole and the molded outsole in the area their interface through chemical bonds between the isocyanate and the elastomer are bonded together. In complete departure from the prior art no adhesive layer is created, rather an interface between the elastomer and that reacting to the polyurethane Mixture created, being in the boundary layer form chemical bonds between the isocyanate and elastomer. Surprisingly, it was found that this resulted in a very permanent connection between the outsole and the Midsole is created, the extreme stress  withstands.

The task, a process for molding soles on shoe uppers to create, the soles from a midsole made of polyurethane and the outsole made of elastomer solved according to the invention in that to influence the Reaction rate of a polyurethane which reacts Mixture containing polyol and isocyanate at least the mixture a catalyst is added to the elastomer substances be added, the reactive, chemical with isocyanate Bindings have incoming end groups, the outsole formed and the mixture for molding the midsole and their connection with the upper and the sole into one formed space between the outsole and the shoe upper is introduced, the reaction rate for formation of the polyurethane and the temperature of the elastomer in such a way can be controlled that the chemical bonds in the area of Interface of the elastomer and the reacting mixture be formed.

For the purposes of the invention, mixtures of polyol and isocyanate which react to form polyurethane are understood to be mixtures based on ether or ester polyols, based on 100 parts by weight.
30 to 100 parts by weight of isocyanate
0.1 to 10 parts by weight of catalyst
the rest of chain extenders and the other usual additives.

As a catalyst, it can be sold under the trade name of AIR- Commercially available catalyst products are used, or the following catalysts, for. For example: DABCO-SB or another Catalyst, e.g. E.g .: DIBUTYL-TIN DILAURATE.  

Within the meaning of the invention, elastomers are the known ones for Understand rubber soles used with elastomers following chemical compounds or chemical substances in one Amount of 0 to 20 phr based on the amount of rubber mixed can be: For example: Acrylonitrile rubber, styrene butadiene Rubber, natural rubber, chloroprene rubber.

For the production of a rubber outsole suitable for this process are all known to be suitable for such a sole Rubber qualities can be used if they contain certain substances are mixed.

The substances are obtained in an amount of 0 to 20 phr (amount mixed with the rubber used).

The following substances are mentioned as examples:
Phenol formaldehyde resins, e.g. E.g .: Vulkadur A (Bayer AG), Coretack (BASF)
Methylolated phenol formaldehyde resins, e.g. E.g .: SP 1045 (Krahn), Korever (BASF)
Resorcinol in connection with a formaldehyde donor, e.g. E.g .: Cohedur A, Cohedur RS or RK (Bayer AG)
Silica fillers, e.g. E.g .: Vulkasil S (Bayer AG), Ultrasil (Degussa)
an amino alcohol, e.g. E.g .: 3-aminopropanol
a primary or secondary amine, e.g. For example: stearylamine
Polyvinyl alcohol, e.g. For example: Mowiwol (Hoechst) or VSH 72 or VSH 73 with a viscosity in the range of 1000 to 10,000 cps 10% aqueous alloy at 25 ° C from AIR PRODUCTS
a high hydroxyl group-containing polyol, e.g. E.g. Formrez (Witco)
Acrylate rubber (ACM), Hydrin (Polysar), Herclor (Hercules) a combination of the above substances.

Forming the outsoles in the sense of the invention is to be understood that the outsoles at the usual processing temperatures from these plasticized elastomers with injection molding machines be injected.

Controlling the temperature of the elastomers means that the temperature of the molded outsole is below  the decomposition temperature of the polyurethane to be formed Midsole is cooled and only then to polyurethane fully reacting mixture in contact with the molded outsole is brought, then in a boundary layer on the Interface and interface of the elastomer and the polyurethane Isocyanate reacts with reactive end groups.

When controlling the temperature of the elastomer is from made use of the fact that an increase in temperature or a reduction of 10 ° C to a shortening or to increase the vulcanization time, d. i.e. the Time until the elastomer has fully reacted by 50% leads.

In principle, the procedure could be such that the sprayed Outsole to a temperature below the decomposition temperature the polyurethane cooled and then the midsole is formed. The prerequisite is that this cooling time is sufficiently short that the elastomer is not yet is vulcanized so that the isocyanate with the reactive End groups in the sense of a permanent connection of the outsole can react with the midsole. Apart from Relatively long cooling times would only result in a limited selection of elastomers for the process according to the invention into consideration.

Another problem can arise when processing mixtures result when reacting due to a high Share foaming agents foaming strongly and a relative Build up high pressure. In these cases it is not without further ensured that the mixture was introduced the outsole, which has not yet been fully vulcanized not partially penetrated.

In a further embodiment of the invention, therefore before introducing the mixture which reacts to form polyurethane the outsole in the area with the polyurethane cooled interface and in the area of the tread heated, the mean temperature of the outsole during and after the mixture is brought to a temperature below the decomposition temperature of the polyurethane is held.  

As the working temperatures and working pressures for processing of elastomer to be plasticized and polyurethane reacting mixtures are different from each other, can the known devices for molding soles not used by the method according to the invention come.

The invention is therefore based on the further object, a Device for molding the soles of the invention on shoe uppers, d. H. for producing the shoe according to the invention to accomplish.

This object is achieved in that the Device at least one according to the principle of an injection molding machine working device for plasticizing the Polymers and syringes of the outsoles and at least one according to the principle of a shoe soling machine for processing Polyurethane device for molding the Midsoles, as well as their connection with the outsoles and with shoe uppers.

These measures create a device that the manufacture of the shoes or the implementation of the process allowed, these different processing temperatures and different working pressures Is taken into account.

According to a further embodiment of the invention, the Device for spraying the outsoles at least one Injection mold, one half of the mold as a plate is formed, the other half of the mold for has an outsole after spraying an outsole and the Open the other half of the mold with the injection mold Outsole is pivotable, the device for shaping the Midsole two side moldings and a last for Showing shoe uppers and that for education  the mold cavity for the midsole to be produced, the side moldings with the pivoted, the outsole having the other half of the mold and the last with one listed shaft can be brought into engagement.

In yet another embodiment of the invention the device for spraying the outsoles several mold halves with a nest for an outsole and around an axis pivotable support body on the one of the mold halves is parallel to the side faces parallel to the axis is arranged.

These measures can be taken after starting up the device one outsole for each work cycle and a midsole is made.

The invention is in the drawing using exemplary embodiments explained.

Show it:

Fig. 1 shows schematically the process of the invention using a section of Fig. 2 with a first embodiment of an injection mold,

Fig rotated. 1a is an alternative embodiment of the platen of FIG. 1, in the same plane at 90 ° C,

Fig. 2 shows schematically a section through a device for implementing the method,

Fig. 3 shows the apparatus of FIG. 2 with an opened injection mold,

Fig. 4a shows a section through a second embodiment of an injection mold,

FIG. 4b shows a section through a second embodiment,

Fig. 5 shows an injection molding system for performing the method.

In Fig. 1, the section in FIG. 2 with 1, which can be moved on spars (in FIG. 2 with 17 ), is designated, on which one mold half 2 of an injection mold 3 is clamped for the production of elastomer soles. This mold half 2 is designed as a plate and has pouring channels 8, 9 .

The second mold half of the injection mold 3 , designated 4, is clamped on a displaceable and pivotable mold mounting plate 5 , designated 5 and shown in the detail, which is also guided on the spars 17 according to FIG. 2 and can be pivoted perpendicular to the axis of the spars. The displaceable and pivotable platen 5 has, according to Fig. 1, on its side facing away from the position shown in the closed position the injection mold side a further mold half 4, located one after pivoting through 180 ° C with the mold 2 and in the closed position also an injection mold 3 for preparing Outsole forms.

The mold halves 4 each have a mold cavity 6 which, with the mold half 2 in the closed position of the injection mold 3, delimits the mold cavity for the outsole.

The mold half 2 has a sprue 9 with the injection bore 8 . The injection bore 8 runs perpendicular to the direction of movement of the movable platen 1 , while the sprue 9 runs parallel to the direction of movement of the movable platen 1 and emerges from the surface of the mold half 2 such that the opening opens into the mold cavity of the mold half 4 .

In the closed position of the injection mold 3, the injection hole 8 is brought to a not shown plasticizing and injection unit for elastomers in engagement and injected through the gate hole 9 plasticized according to the invention rezeptiertes elastomer material for molding of the outsole. The mold half 2 has cooling channels 10 and the mold half 4 has heating channels 11 . A cooling medium flows through the cooling channels 10 and a heated medium flows through the heating channels 11 . The operating temperatures can be selected so that the outsole vulcanizes more slowly in the contact plane of the two mold halves than in the area of the tread.

By specifying the flow rate and the temperature for the cooling medium and the heating medium, a corresponding temperature distribution is achieved in the closed injection mold 3 , so that the plasticized elastomer in the mold half 4 in the area of the tread of the outsole vulcanizes rapidly while the boundary layer the outsole, which is in contact with the mold half 2, is then vulcanized after the injection of the material for the midsole.

After the elastomer material for the outsole has been injected, the injection mold 3 is opened, as described below. Subsequently, the displaceable and pivotable platen 5 is pivoted by 180 °, so that it takes the position shown in Fig. 1 with the molded and 6 ' labeled outsole, while the mold half 4 , which was in the upper position, is pivoted downwards .

The now in the upper position mold half 4 works with two side moldings 12 and 13 and a last 14 with an attached shoe upper 15 for shaping the midsole 16 ' from a mixture reacting to form polyurethane, which is formulated according to the invention.

In the closed position, the side molded parts 12, 13 delimit , in a manner known per se, a sprue channel which is symmetrical with respect to their contact plane for injecting the mixture foamed into polyurethane which is formulated according to the invention.

The side mold parts 12, 13 of the last 14 with the shaft 15 and the mold half 4 delimit the mold cavity 16 , which has the volume of the midsole 16 ' . When processing mixtures which react to form polyurethane, it is known that the problem arises that the mixture, owing to its low viscosity, prevents the formation of delimited layers, unless a targeted expulsion of material takes place. For this purpose, the side mold parts 12 and 13 each have an undercut 18 in the direction of the outsole.

When the mixture is introduced, to which a blowing agent is added to form an elastic midsole, the mixture reacts with foaming, foaming the area of the undercuts. After the finished shoe has been removed from the mold, the sole is cut perpendicular to the undercuts, so that a clean dividing line is formed between the midsole 16 ' and the outsole 6' .

FIG. 2 shows the device for carrying out the method according to the invention, which is shown in detail in FIG. 1. In Fig. 1, the parts are designated by the same reference numerals.

The apparatus of Fig. 2 has four beams 17, which form with the two support plates 30 and 19 has a machine frame. The displaceable platen 1 is guided on the spars 17 , two of which are visible. On its side facing away from the mold half 2, it has a known locking unit, designated 20 , which in the simplest case is a toggle joint which can be actuated by a cylinder, for example, or has at least one travel cylinder and at least one form-locking cylinder of a known type.

The displaceable mold mounting plate 1 carries two displaceable spars 21 , at the free ends of which a displaceable and pivotable mold mounting plate 5 is rotatably articulated.

The platen 5 is arranged on the spars 21 by means of cylinders, not shown, in the direction of the platen 1 .

In FIG. 2, the injection mold is shown in its closing position 3.

In this closed position of the injection mold 3 , the displaceable and pivotable support body 5 is in contact with the stand plate 19 .

The stand plate 19 has an opening 22 into which the mold half 4 , which has an outsole, is immersed and cooperates with the side mold parts 12 and 13 and the last 14 with the shaft 15 provided .

In Fig. 2, the two side mold parts 12, 13 are in their closed position according to FIG. 1 and limit the mold cavity 16 for molding the midsole 16 ' with the last 14 with the shaft 15 which has been applied.

In the position shown in FIG. 2, with the mold 3 closed and after the mold cavity 6 has been formed, plasticized elastomer is injected into the closed mold 3 to form an outsole 6 ' and the mold cavity 16 is supplied with a mixture which reacts to polyurethane, forming the midsole 16 ' Fully reacted, isocyanate with the reactive end groups of the not yet vulcanized boundary layer of the already formed outsole 6' ( Fig. 1) chemical bonds for permanent connection of the outsole with the midsole 16 ' .

Subsequently, the closed position is acted on in such a way that, in the illustration in FIG. 2, the displaceable platen 1 moves downwards, the cylinders, not shown, for the guide bars 21 also being acted on at the same time. This has the consequence that the injection mold 3 is opened, ie the two mold halves 2 and 4 disengage and at the same time the upper mold half 4 disengages from the stand plate 19 . Fig. 3 shows the device in this position. In this open position, the platen 5 is pivoted so that the lower mold half now assumes the position of the upper mold half 4 . The injection mold 3 is closed by appropriately loading the working cylinder and the clamping unit 20 . At the same time, a last 14 with a stripped shaft 15 , to which the outsole 6 ' and the midsole 16' is to be formed, is arranged on the side moldings brought into their closed position. Then - as explained above - the midsole 16 'is formed and simultaneously connected to the outsole 6' and the shoe upper.

The known ones for the manufacture of outsoles are so far used elastomers can be used with corresponding Substances that have reactive end groups and before Plasticizing can be mixed.

The following mixtures gave particularly good results achieved for the elastomers:

Embodiment 1

Embodiment 2

Embodiment 3

In general, the known ones for the outsoles Elastomers are used if they have one or more of the following substances are added.

For the production of a suitable for this process Rubber outsoles are all suitable for such a sole known rubber qualities can be used if they match certain Substances are mixed.  

The substances are used in an amount of 0 to 20 phr (amount based on the rubber used).

The following substances are mentioned as examples:
Phenol formaldehyde resins, e.g. E.g .: Vulkadur A (Bayer AG), Coretack (BASF)
Methylolated phenol formaldehyde resins, e.g. E.g .: SP 1045 (Krahn), Korever (BASF)
Resorcinol in connection with a formaldehyde donor, e.g. E.g .: Cohedur A, Cohedur RS or RK (Bayer AG)
Silica fillers, e.g. B. Vulkasil S (Bayer AG), Ultrasil (Degussa)
an amino alcohol, e.g. E.g .: 3-aminopropanol
a primary or secondary amine, e.g. For example: stearylamine
Polyvinyl alcohol, e.g. For example: Mowiwol (Hoechst) or VSH 72 or VSH 73 with a viscosity in the range from 1000 to 10,000 cps 10% aqueous alloy at 25 ° C from AIR Products
a high hydroxyl group-containing polyol, e.g. E.g. Formrez (Witco)
Acrylatkautsuk (ACM), Hydrin (Polysar), Herclor (Hercules) a combination of the above substances.

For the mixtures reacting to form polyurethane, ether or ester polyols (B component) with the appropriate proportions of isocyanate (A component) are mixed.

DABCO-SB was the catalyst for the production of PU AIR PRODUCTS in proportions of 0.1 to 10 percent by weight and added as foam stabilizer LK 221 from AIR PRODUCTS.

For the production of shoes with an outsole made of a formulated elastomer according to one of the above-mentioned exemplary embodiments 1 to 3, a mixture of the following composition reacting to polyurethane was used:

The elastomer according to the invention is injected into a mold according to FIG. 1 at a processing temperature of approx. 150 ° C. Before the injection, the mold half 4 had a temperature of approx. 150 ° C. After about 2 minutes, the injection mold 3 was opened and the mold half 4 with the outsole 6 'was brought into the upper position (see FIG. 1), the mold cavity 16 was formed and the mixture was introduced into the mold cavity 16 . After 3 minutes, the finished shoe was removed from the mold.

A particular advantage is that the amount of Metal catalysts, e.g. B. Organotin compounds significantly could be reduced, reducing the well-known skin formation avoided in the polyurethane at the PUR elastomer interface could be.

Fig. 4a shows a further embodiment of an injection mold for producing the outsole 6 ' .

According to FIG. 4a, the injection mold 25 consists of the mold half 2 and the mold half 26 , which has an undercut 27 of small height and an adjoining undercut 28 of greater height in the manner of a bead.

FIG. 4b shows the mold cavity 29 for molding the midsole 16 'with the mold half 6 and the side mold parts 12, 13 and the strips 14 with the set contributed shaft 15 in FIG. 1.

The targeted expulsion of the elastomer and the targeted expulsion of the polyurethane form a circumferential bead that cut perpendicular to the sole of the shoe after production with a perfect dividing line between the elastomer and the polyurethane is achieved.  

In Fig. 4a, another embodiment is shown for the molds or mold halves. The mold half 26 having a nest has an undercut which consists of a gap 27 and a flood groove 28 . It serves to inject a closed sealing lip 27 ' with bead 28' on the outsole. The side moldings engage over these sealing lips, so that a sealing closure against the mixture which reacts to form polyurethane is ensured.

FIG. 4b shows an embodiment of the side mold parts 12, 13. These side moldings each have a circumferential undercut 31 which overlaps the sealing lip 27 ' ( 28' ) in the closed position of the side moldings. The targeted material expulsion 31 ' and the sealing lip 27' ( 28 ' ) form a wide zone, which ensures that the connection of the midsole according to the invention with the outsole is made securely on the finished shoe on the side edge.

FIG. 5 shows a side view of a device 32 (exemplary embodiment) with a device 33 for spraying outsoles and a device 34 for processing the mixture which reacts to form polyurethane and for shaping the midsoles.

The device has a so-called rotary table 19 , which is generally known in shoe soling machines for molding shoe soles, which have an outsole and a midsole and are made from a mixture of isocyanate and polyol (cf. Desma brochure 581 S-586 S.

While these known shoe soling machines have two devices 34 for processing the mixture which reacts to form polyurethane, the device 33 takes the place of the one device, which is a spraying machine and plasticizes the elastomers from which the outsoles are injected.

Fig. 6 shows a perspective view of a shoe according to the invention with a section through the sole, wherein the shoe tip is cut off. With 6 ' the outsole and 16 ' is the midsole. The double arrows symbolically represent the bonds achieved according to the invention, while the length of the double arrows schematically represent the thickness of the boundary layer.

Claims (11)

1. Shoe with a molded midsole made of polyurethane and a molded outsole made of elastomer, characterized in that the midsole ( 16 ' ) and the outsole ( 6' ) in the area of their interface by chemical bonds between isocyanate and reactive end groups of the substances added by the elastomer are interconnected. 2. Process for molding soles on shoe uppers, wherein the soles from a midsole made of polyurethane and an outsole made of elastomer, characterized, that to influence the reaction rate of a to react with polyurethane, polyol and isocyanate Mixture, the mixture at least one catalyst is added, substances are added to the elastomer, the reactive, chemical bond with isocyanate Have end groups, the outsole is formed and the mixture for the midsole in a space between the Outsole and the shoe upper is introduced, the reaction speed to form the polyurethane and the temperature of the elastomer can be controlled so that the chemical bonds in the area of the interface of the elastomer and the reacting mixture are formed.   3. The method according to claim 2, characterized, that prior to the introduction of the polyurethane which reacts Mix the outsole in the area with the polyurethane cooled interface and in the area of Tread is heated and the average temperature of the Outsole on and after applying the mixture a temperature below the decomposition temperature of the Polyurehans is held. 4. Apparatus for performing the method according to claim 2 Or 3, characterized, that the device at least one according to the principle of a Injection molding machine for plasticizing of the polymer and spraying the outsoles and at least one according to the principle of a shoe soling machine for Processing polyurethane working device for Forms of the midsoles and their connection with the Has outsoles and with shoe uppers. 5. The device according to claim 4, characterized in that the device for spraying the outsoles has at least one injection mold ( 3 ) which is formed a mold half ( 2 ) as a plate and has a sprue hole ( 8 ), the other mold half ( 4 ) Nest for the outsole, after spraying an outsole and opening the injection mold, this other half is pivotable with the outsole, the device for molding the midsole has two side moldings and a last for listing shoe uppers and that for forming the mold cavity for the one to be manufactured Midsole, the side moldings with the pivoted, the outsole having the other half and the lasts can be brought into engagement with an attached shaft. 6. The device according to claim 5, characterized, that the device for spraying the outsoles and the Means for molding the midsoles of a work station form. 7. The device according to claim 6, characterized in that the plate-shaped mold half ( 2 ) is clamped on a movable mold clamping plate ( 1 ) guided on spars, the mold half having the nest ( 4 ) is clamped on a pivotable mold clamping plate ( 5 ), the pivotable mold mounting plate is mounted in a frame guided by the spars, the spars with stand plates ( 19, 30 ) form a machine frame, and the stand plate adjacent to the frame has an opening ( 22 ) through which the mold half having the nest with the side moldings passes ( 12, 13 ) can be brought into engagement. 8. The device according to claim 7, characterized, that the pivotable platen is a prismatic Body, perpendicular to its axis, is the outline of an N-corner has and mold halves on the side surfaces parallel to the axis are arranged with a nest. 9. The device according to claim 8, characterized, that between the frame and the sliding platen Working cylinder for closing and opening the mold are arranged.   10. Device according to one of claims 4 to 9, characterized in that the mold half having the nest has an undercut opening into the nest ( 27, 28 ) to form a self-contained sealing lip ( 27 ' ) which cooperates with the side moldings when producing the midsole. , 28 ' ) has. 11. Device according to one of claims 4 to 10, characterized in that the side moldings each have a cooperating undercut ( 31 ) to form a targeted material expulsion ( 31 ' ) in the region of the sealing lip when processing the polyol-isocyanate mixture.