DD270241A5 - SHAPE STATIONS, INS. FOR ROUND TABLE EQUIPMENT, FOR REPRODUCING SHOULDER CARBONS WITH A SOLE FROM ELASTOMER AND A MIDSOLE FROM A POLYURETHANE MIXED MIXTURE OF ISOCYANATE AND POLYOL IN SHOES - Google Patents

Abstract

The invention relates to mold stations, in particular for rotary table systems, for molding shoe soles with an outsole made of elastomer and a midsole ausreagierendem of a polyurethane mixture of isocyanate and polyol on Schuhschaefte. The mold station is intended for rotary table systems, it can also be used as a single station. It is used for molding shoe soles with an outsole made of elastomer and a midsole ausreagierendem to a polyurethane mixture of isocyanate and polyol on Schuhschaefte, and has a height adjustable Traverse with a pivotally mounted Formenteiltraeger with at least one heatable mold part for molding soles and below this Traverse a height adjustable second Traverse with a heated plate on. The heatable plate cooperates with the heated mold part of the pivotable mold part carrier with side moldings and aufeisteten Schuhschaeften for molding the midsoles. It has on the one side, parallel to the second height adjustable cross member cooperating with the heated plate mold part with the mold cavity for an outsole to be formed and on the other side a cooperating with the side moldings and the aufgeeisteten shaft mold part with a mold cavity for receiving an already formed Outsole on. Above the traverse with the pivotally mounted Formenteiltraeger a hoehenverstellbare strip holder is arranged with a strip turning body. The stripper body has a strip for a shaft and a vacuum applied punch for taking over the molded outsole, which he gives after cooling to the mold cavity for the already shaped outsole. Fig. 2

Description

Mold stations, in particular for Rundtisohanlagen, for molding Sohuhaohlen with an outsole made of elastomer and a midsole of a ausreagierenden to polyurethane mixture of isocyanate and polyol at Schuhsohäfte

Field of application of the invention

The invention relates to a mold station, in particular for rotary table systems, for molding shoe soles with an elastomer outsole and a thermoplastic midsole on shoe stems, wherein the midsole and the outsole are chemically bonded between isocyanate and reactive end groups of the elastomer added substances are interconnected

Characteristic of the known state of the art

Shoes with an intermediate sole of polyurethane and also made of polyurethane outsole are known from DE-PS 2 241 493.

For her Hers bellung come in general rotary table systems are used, which have several Formensbationen with forms (Prospectus Klö'ckner Ferromatik Desma, Spritzgieö Direktansohlmaachine, DESMA 321S - 526S) ₀

The rotary table systems have two devices for mixing isocyanate and polyol to a mixture ausreagierenden to polyurethane, which reacts depending on the mixing ratio and the additives to the abrasion resistant outsole or to the elastic midsole ».

The round table is rotated intermittently to form the soles and the midsoles. "

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brought into engagement with the two devices for mixing «

These Mißchen facilities are slidably disposed on the periphery of the rotary table and in the radial direction of the Ruudtisches · The mold stations have two Seitenforint on which limit an opening and two runners in the 'closed position.

Above the side moldings. Is height adjustable arranged a Leiatendrehkörper having a strip for receiving Schuhschäften and a counter punch ^

Below the side moldings, a bottom punch is height-adjustable · For forming the outsole, the bottom punch limits the side mold parts (in the closed position) and the counterstem a mold cavity into which the mixture reacting to the outsole is introduced

To form the midsole limit the bottom punch with the outsole located on it, the side moldings (in the closed position) and the strips rait the aufgeeisteten shank a mold cavity into which the intermediate to ausreagierende mixture is introduced, which during the ongoing reactions with the outsole and connects with the shoe upper »

According to DE-OS 3,600,682, mold stations are known for rotary table systems for molding shoe soles with an outer sole made of elaatomer and a polyurethane midsole *

To shape the outsole made of elastomer occurs in place

the device for mixing the mixture of the polyurethane outsole, the plasticizing and injecting unit known in injection molding machines for processing thermoplastic material, for plastifying the elastomer, which is then injected into the mold cavity for the outer soles. Drlicke occur, the known mold stations on a höhenversteilbare traverse with a pivotally mounted mold carrier, on its side faces parallel to the pivot axis heated mold parts arranged with an outsole corresponding mold cavity 3ind, which additionally have cooling ducts »

Below this traverse, a second height-adjustable traverse is arranged, which has on its side facing the pivotable mold carrier part a heatable plate which cooperates with the heatable Fcrmteilen the molded part carrier for the manufacture of outsoles. Above the traverse with the pivotable mold carrier another traverse with a Dui'chbruch is firmly fixed «In this breakthrough immersed a heated mold part with a mold cavity located in the outsole of elastomer and works with two located above the breakthrough side moldings and a aufgeeisteten shoe upper for molding a twin sole made of polyurethane »

The outstanding for polyurethane blends for the outsole and for the midsole have substantially polyol and isocyanate and chain extenders and catalysts, depending on the required material properties for the outsole or midsole - the outsole should be resistant to abrasion, the midsole elastic and "a pore structure on-

wise - are adjusted by appropriate additives

When mixing the components already start the chemical reactions. The mixtures react in the molds to the outsole b? .W * Zwisohensohle aus. When reacting the mixture for the Zwisohensohle at the same time the midsole is formed and the connection made with the shoe upper and the outsole «

The elastomer outsole and the polyurethane midsole are joined together at their interfaces by chemical bonds between iso-isocyanate and reactive end groups of the substances added to the elastomer «

The mixtures ausreagierendeu to polyurethane mixtures are based on ether or ₀ Est'srpolyolen, based on 100 parts by mass of

30 - 100 % by weight of isocyanate, 0.1 - 10% by weight of catalyst, remainder core extender and other customary additives

respectively.

The catalyst used is, inter alia, under the trade name of Pa. Airproducts commercially available catalyst DABGO-SB for use

The outsoles are made of elastomers which contain the following chemical compounds or chemical substances in

a mass fraction of 0-20% based on the amount of rubber can be mixed z. B, Aoryl Nitrile Rubber, Styrene Butadiene Rubber, Natural Rubber, Ohloroprene Rubber »

The outsoles can generally made of all known rubber qualities v / earth, who z. B * following substances in a mass fraction of 0 - 20 % (mass based on the rubber used) are admixedι

Phenol-formaldehyde resins, Z ₀ B _# t Yulkadur A (Bayer AG), Ooretack (BASF)

- Methylolated phenolformaldehyde resins, eg. B.i SP 1045 (Krahn) Korever (BASF)

- Resorcin in connection with a formaldehyde donor, z. B, t Cohedur A)

- Oohedur RS) (Bayer AQ) Oohedur RK)

Silica fibers (eg

Vulkasil S (Bayer AG) 'Ultrasil (Degussa)

- Aminoalcohol, z. B.j 3-Amin.o-propanol

primary or secondary amine, e.g. B. Stearylamine

- Polyvinyl alcohol, z. B.t.

Mowiwol (Hoechst) VSH 72 (AIR PRODUCTS) VdH 73 (AIR PRODUCTS)

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- high hydroxyl group-containing polyol, ζ «B.i Formrez (Witco)

Acrylic titanium rubber (AOM), eg hydrin (Polysar) Herolor (Hercules) or a combination of the abovementioned substances,

The formation of the outsole of elastomer is carried out in such a way that the elastomers are plasticized in the usual Yerarbeitungstemoatures and injected according to the usual in injection molding machines with correspondingly high pressures in the corresponding Forinhohlräume *

The control of the temperature of the elastomers is such that the temperature of the molded outsole is cooled to just below the decomposition temperature of the polyurethane of the intermediate cavity to be formed and then the mixture reacting with polyurethane is brought into contact with the molded outsole, wherein in the forming boundary layer reaction of the elastomer and the reacting polyurethane isocyanate with reactive end groups «

In the control of the temperature of the elastomer, use is made of the fact that a temperature increase or a reduction of 10 ⁰ O to a shortening or an extension of the vulcanization time, ie eggier time until the elastomer is completely reacted, by 50% "

The cooling rate of the formed elastomeric outsole to the temperature at which the mixture reacting to Zwisohensohl © polyurethane is fed to the mold cavity for the midsole, is substantially dependent on the high heat capacity of the on the pivotable Formenteil-.

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carrier arranged Fo vmeateile determined «

This cooling speed has the consequence that the time for the shaping and cooling of an outsole is substantially greater than the time required for shaping the midsole.

A particular problem also arises because the outsole is cooled from the relatively high temperature at which a plasticized elastomer is injected to the temperatures for molding the midsoles, the outsoles generally undergo changes in their dimensions which are no longer negligible, i.e. H. that it is not possible to neglect this shrinkage in general alleli elastomers, and thus the mold part with the mold cavity, which is used for molding the outsole made of elastomer, then work together with the cooled outsole with the side moldings and a aufeisteten shaft for producing the midsole to let.

Object of the invention

The object of the invention is to provide mold stations for shoe sole soles which can be used to reliably and economically produce

Explanation of the essence of the invention ;

The invention is based on the object mold stations, especially for rotary table systems, for molding shoe soles with an outsole made of elastomer and a; To create midsole on a polyurethane ausreagierenden mixture of isocyanate and polyol on shoe shanks, where in the production of the shrinkage of the outsoles made of elastomer is taken into account

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This object is achieved in that the pivotally mounted Formt.eilträger on one side parallel to the second höhenveratellbaren traverse side cooperating with the heated plate mold part with the Fc? Mennest for a Leufp.ohle to be formed and on the other side with the Side moldings and the aufgeeisteten shaft cooperating mold part having a mold cavity for receiving an already shaped LaufsoU.e, above the cross member with the pivotally mounted Formteilträgor a height adjustable Ledgeaufnähme arranged with a Leiatendrehkörper lot, and the stripper body a strip for a shaft and a vacuum acted upon Counterpoise for taking over the molded outsole and transferring it after cooling to the mold seam for the already formed outsole,

By these measures it is achieved that the still hot outsole made of elastomer is taken from the acted upon by vacuum or _e vacuum counter punch the strip holder and passed after cooling and wide achwundwarmen cooling to the mold cavity of the mold part, which is then used to form the midsole of polyurethane works together with the side mold parts and the stem listed on the last »

The mold nest for shaping the outsole except elastomer is dimensioned so that the outsole after cooling on the nose counter has given dimensions to the finished shoe, d. H. the mold cavity of the mold part, which cooperates with the side mold parts and the shank on which the work has been performed, also the dimensions of the outsole after cooling, d. H. in the final state has »

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Conveniently v / else the management For eil is ufschlagbar with the Formenaest receiving the outsole with vacuum be &, wherein the molding as 3 n mUndenda mold cavity has in both cases bores ·

Ausfuhrungabeiaplel

The invention ieb in the drawing using a AusfUhrungsbeispiels explained »It show

1t is a schematic plan view of a round

tisohanlaget

Fig. 2 to 6t in a side view of the AuafUhrungsbeispiel

the training station in different working positions «

Figure 1 shows in plan view the rotary table system shown schematically "It has a rotary table 1, on the mold stations 2, shown schematically by squares, are arranged» The squares also indicate the positions _# , which occupy the mold stations in the cyclic rotation of the rotary table. In the present case, after 15 cycles or steps of the rotary table 1, each forming station 2 has reached its original position. "These positions are from 2 ^ <to 2 ^. bezeichnet6

At the periphery of the rotary table 1, the plasticizing and injection unit 3 is arranged for an elastomer, mii after each stroke. one of the forming stations 2, which has then taken the position 2 ^ ₁ , is brought into engagement by a radial displacement to the rotary table 1, which is symbolically represented by the double arrow ₀ Once the plasticizing and injection unit 3 is engaged with the mold station, is Elastomer injected into the mold cavity for the outsole *

Furthermore, in the radial direction of the Rondtisch the device 4 is also displaceably arranged for mixing the mixtures to be reacted with polyurethane. After each working cycle, this device 4 can likewise be brought into engagement with a mold station which has been rotated into the corresponding working position 2 , so that a midsole Depending on the reaction or vulcanization time of the materials used, both aggregates can also be exchanged for one another «

FIGS. 2 to 6 show a side view of an exemplary embodiment of the molding station according to the invention in various working positions, specifically in the direction of the arrow of the plasticizing and injection unit 3 or 'the device 4 for mixing,

Figure 2 shows the mold station 2, the mold parts for molding the outsole, and the mold parts for molding the midsole in their closed position.

The mold stations 2 has four guides 5, only two of which are visible.

The guides 5 form with a fixed cross member 6 and a breakthrough 7 having traverse 8 a fixed FUhrungsrahmen for the height-adjustable cross member 9 with the in "her about bolt 10 pivotally mounted mold part carrier 11 o

Below this height-adjustable traverse 9, the second height veratellbare traverse 12 is arranged ·

The height-adjustable traverse 12 has on its side facing the traverse 6 a form-retaining cylinder 13 and on its height-adjustable traverse 9 side facing a heatable plate 14 on ·

On the traverse 6, the two driving cylinders 15 are fixed, the piston rods 16 are connected to the height-adjustable traverse ·

The pivotally mounted mold part carrier 11 has in FIG. illustrated position on its side facing the crossmember 12 a mold part 17 with a nest 18 which has the dimensions of the outsole to be formed · The mold part 17 is arranged on a wooden block 19 which is connected via the insulating plate 20 with the pivotally mounted mold part carrier 11 "

The mold part carrier 11 has, on its second side facing away from the displaceable cross member 12 and parallel to it, a cooling plate 21 which is insulated against it and through which a coolant flows. · A molding part 22 is arranged on it *

This cooled from the cooling plate mold part 22 has a mold cavity 23, which corresponds to the dimensions of the outsole after cooling ₀

Innerhaiο the Traverse 8 and above Durchbruohes 7 are the two side moldings 24 | 25, which in its closed position delimit a breakthrough which, with a shoe shank 27 listed on the strips 26 and the molded part 22 with the formed outsole, not shown, limits the mold cavity for shaping the midsole.

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Since high Spritzdrticke occur during injection molding of the outsole of an elastomer, which are comparable with the in injection molding machines for processing thermoplastic Substantive it is necessary to provide _a hrzylinder F and the mold clamping cylinder for injection molding machines according to the conventional technique both.

As can be seen in FIG. 2, during the injection of the plasticized elastomer into the nest 18 bounded by the heatable plate 14 and the mold part 17 in its closed position, the reaction force is applied via the frame formed by the cross members 6j 8, the pivotable mold part carrier is supported on the traverse 8 in the edge area of the opening 7 ·

The height-adjustable cross member 9 is taken during the process of traverse over a Schlegestänge (not shown), so that in the position of the drive cylinder according to Figure 3, the Tranvers occupy the positions shown »

The mold station 2 has above the traverse 8 with the Durcnbruch 7 a known per se height adjustable strip holder 29 with a strip body 31 which is pivotable about the pin 30 »

The strip 26 and a punch 32 with a frontal plate 33 are fastened to the strip rotary body.

The plate 33 has in its surface mlindenae channels 34 to which a vacuum bzwo negative pressure can be applied via a vacuum system, not shown.

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Figure 2 shows the positions of the cross members of the forming station 2 in the 2-position _Q1 (see FIG. I) ₀

In this position, the plasticizing and injecting unit 3 will travel in the direction of the forming station 2 in the direction of the wheel and will bear against the sprue (not shown) of the nest 18, with plasticized elastomer injected into the nest.

The nest remains closed until after a corresponding number of working cycles of the rotary table 1, the mold station from the position 2 _Q ^ after reaching the

Positions 2 _Q2 , 2 _Q y 2 _Q4 , 2 _Q8 , 2 _Q9> 2 _Λχ) the position

2 * λ has reached again.

In the again reached position 2 ^ the driving cylinder 15 are acted upon in accordance with Figure 3 so that the two height-adjustable trusses 9 | 12 einnehipsn the apparent from Figure 3 position.

In this position of the two trusses of the pivotally mounted mold part carrier 11 is pivoted by 180 ° »so that the cooled mold part 22 of the heated plate 14 is arranged opposite and the mold part 17 with the still hot outsole made of elastomer, the position of the orormeils 22 of Figure 2 occupies.

The height-adjustable strip holder is moved from its apparent from Figure 2 position in its upper end position, while the two 3eitenformteile 24ι 25 are moved into their waximale open position. The stripper body is pivoted through 180 °, so that the

Stamp 32 with its atirnaeitigen plate 33 towards the outsole made of elastomer shows »

According to Figure 4, the height-adjustable strip holder moves into its lower Bndstellung, at the same time the drive cylinder 15 drive the sliding crosshead 12 in the height, which leads over the springs 36, the upper cross member 9 in the position shown until the outsole L touched by the plate 33 becomes·

Subsequently, the channels 34 of the plate 33 are subjected to vacuum or negative pressure, so that the outsole L is taken over by the plate 33.

According to FIG. 5, the displaceable cross-member 9 travels with the molded part carrier 11 1λ, which is mounted in a sealed manner, on the lower position shown in FIG. 3, so that the pivoting region is released for pivoting the pivotable molded part carrier 11.

In this position, the movable cross member 9 of the verachwenkbare mold part carrier 11 is rotated by 180 °, so that the mold part 22 points with its nest back towards the outsole L.

Subsequently, the displaceable cross member 9 moves with the pivotable mold part carrier 11 in the upper position of Figure 6, in which the mold part 22 continues with its nest in the direction of the plate 33 ·

The height-adjustable strip holder is moved in the direction of the mold part 22 until the cooled in the meantime

-17 ·

Outsole L of elastomer comes to rest against the mold nests 23 ".

Subsequently, the channels 34 of the plate 33 are pressurized, so that the mold cavity 23, the outsole L "takes over ο The mold part 22 may have holes 35 which open into the nest, so that by applying a vacuum, the cooled outsole can be taken. The height-adjustable strip holder is moved after delivery of the outsole to the mold holder 23 in their upper end position of Figure 3 »In these ends division of the stripper body is pivoted by 180 °, so that the strips with the aufeisteten shaft toward the outsole shows»

The side moldings 24 $ 25 are brought into the closed position and moved the movable crosshead with the swivel mold carrier part in the direction of the side moldings to the plant »

At the same time, the height-adjustable strip holder in the direction of the located in the closed position Seiten-. moldings 24} 25 until the supplied shoe upper with sealing compound is arranged on the side moldings *

About the side moldings 24 | 25 in its closed position limited runner hole (not shown) is introduced to the polyurethane auareagierende mixture in the by the Seitenforti «share, the listed shaft and the outsole limited Fox mhohlraum«

Finally, the shoe with the finished sole is deprived and a new shaft is placed on the last.

Aua the above statements it is readily apparent that in stationary operation of the rotary table system at the same time each an outsole and a midsole are injected and at the same time in the area between the positions 2, or 2 ^ in a Ent nehmest ion (not shown) a finished shoe is taken on the shoe upper a sole with an outsole made of an elastomer and a midsole made of polyurethane is molded ₀

The inventive design of the mold station continues to create a rotary table system with short cycle times »

It is within the scope of the invention to use the mold stations individually, which is particularly advantageous for small series and small series of experiments »For this purpose, then the device for mixing the ausreagierenden to polyurethane mixture and the plasticizing and injection unit for the elastomer, for example Be arranged one above the other or diametrically opposite each other.

As already mentioned, the injection of the plasticized elastomer in the nest for the outsole takes place in the position 2 _{Q1 of} one of the molding stations 2, which then moves in the unchanged position of the traversable crosses positions 2 _Q1 , etc. to 2 ^ »From the position 2 ^ up to the position 2 _Q ^ the movements described above with reference to Figures 2 to 6 of the displaceable trusses and the movable strips recordings, as well as the pivotal movements of the pivotable mold part carrier and the strip rotating body, in which case the closed mold nest for the

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Midsole is fed to the mixture ausreagierende to polyurethane «This applies to all mold stations 2a

The same applies to rotary table systems with a larger or smaller number of moldings and positions of the rotary table ·

A particular advantage of the inventive device according to the invention is that different mold parts are used for the vulcanization of the molded outsole made of elastomer and for cooling the vulcanized outsole, so that the times for the vulcanization and cooling are independently definable.

It is furthermore essential to the invention that the total time for the vulcanization and cooling of the outer soles for further processing is considerably shorter than when using molded parts which are first heated for vulcanization and then cooled to cool the outer soles.

Claims (1)

Berlin, 15 * 08.1988 AP A 43 D / 308 619-1 69 239/26 claims 1β Formations, inabesondere Rundtisohanlagen, for molding shoe soles with an outsole of elastomer and a Zwiachensohle of a polyurethane ausreagierendem mixture of isooyanate and polyol on shoe stems, the Zwiachensohle and the outsole by chemical bonds zwisohen laocyanat and reactive end group ^ of the elastomer added substances are interconnected, the Pormenstation has a height-adjustable traverse with a pivotally mounted mold carrier with at least one boehmbaren molding for molding outsoles and below this crossbar a höhe'nversteilbare second Traverse is arranged with a heated platto with the heated molding of the pivotable mold carrier cooperates to form outsoles, and the pivotable mold carrier cooperates with side moldings and aufgeeisteten shoe shafts for the molding of the mids, characterized in that ß the pivotally mounted mold carrier on the one, the second height-adjustable traverse (12) parallel side with the heated plate (14) cooperating mold part (17) with the mold cavity for an outsole to be molded and on the other side with the side moldings and the bullet cooperating mold part (C2) with © inem Formnest (23) for receiving an already shaped outsole, above the crossbar with the pivotally mounted mold carrier a height adjustable Leisbenaufnahme (29) arranged with a Leiatendrehkörper (31) ist.ist, and the Leiatendrehkörper ( 31) a strip (26) for a shaft and with a. Vacuum beauflaglagbaren punch (32) for Takeover of the molded outsole and its handing over after cooling to the formant test for the ready-formed outsole » Fermentation according to claim 1, characterized in that the mold part with the mold cavity for receiving the outsole is acted upon with vacuum 3. Fermentation according to Anapruch 1 and / or spoke _2f characterized in that the mold part has holes opening into the mold nest « Here are 6 pages drawings