DD270242A5 - SHAPE STATIONS, INS. FOR ROUND TABLE EQUIPMENT, FOR REPRODUCING SHOULDER CARBONS WITH A SOLUBLE OIL FROM ELASTOMER AND A MIDSOLE FROM A POLYURETHANE EXTRACTING 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 of 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 molding for molding soles and below this Traverse a height adjustable second Traverse with a heated plate on. The heatable plate cooperates with the heatable mold part of the pivotable Formenteiltraegers for molding outsoles. The in the height-adjustable traverse pivotally mounted mold part carrier has on one side parallel to the second height adjustable traverse cooperating with the heated plate mold part with the mold cavity for the outsole and on the other hand a cooled, acted upon with vacuum mold part with a mold nest for the takeover the outsole, which is pivoted into the working position for forming the midsole. Fig. 2

Description

i-2

Mold stations, in particular for Rundtiaohanlagen, for molding shoe soles with a sole outsole made of elastomer and a midsole of a ausreagierenden to polyurethane mixture of isocyanate and polyol at Schuhschafte

Field of application of the invention

The invention relates to a mold station, in particular for Rundtisohanlagen, for molding shoe soles with an outsole made of elastomer and a midsole of thermoplastic material on shoe stems, wherein the midsole and the outsole are joined together by chemical bonds between xsocyanate and reactive end groups of the elastomer added substances.

Characteristic of the known state of the art

Shoes with a Zwiachensohle of polyurethane and also consisting of polyurethane outsole are known according to DE-PS 2 241 493 ·

For their production are generally round table laminates are used, which have several mold stations with forms (Prospect Klöckner Ferromatik Desma, injection molding direct machine, DESMA 521S - 5 ^ 6S).

The rotary tabletops have two means for mixing isocyanate and polyol to a mixture ausreagierenden to polyurethane, which reacted depending on the mixing ratio and the additives to the abrasion-resistant outsole or to the elastic midsole

π yB-05-p> u

To form the outsoles and the midsoles, the rotary table is rotated in cycles. The mold stations are successively brought into engagement with the two devices for mixing.

These mixing devices are slidably mounted on the periphery of the rotary table and in the radial direction of the rotary table. The mold stations have two side moldings which, in the closed position, define one passage and two runners ©

Above the side moldings, a rotary head is arranged adjustable in height, which has a strip for holding shoe stocks and a counter punch «

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

To form the midsole, the soil temples with the outsole on them, the side moldings (in the closed position) and the stem with the inserted stem define a mold cavity into which the midsole completing mixture is introduced which, during the running reactions with the outsole and connects with the shoe upper ·

According to DE-OS 3,600,682 mold stations for rotary table systems for molding shoe soles with an outsole made of elastomer and a Zwijesohle made of polyurethane are known.

To form the elastomeric outsole, the means for blending the polyurethane outermosting mixture into place is replaced by the plasticizing and injecting unit known in injection molding machines for processing thermoplastic material for plasticizing the elastomer, which is then injected into the mold cavity for the outsoles. Since high pressures occur during injection of the plasticized elastomer, the known mold stations have a height-adjustable traverse with a pivotally mounted molded part support "on whose side surfaces parallel to the pivot axis heatable mold parts are arranged with a mold cavity corresponding to the outsole ·

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 heated moldings of the mold carrier for the manufacture of outsoles. Above the traverse with the pivotable mold carrier another traverse with a breakthrough is fixed. In this "breakthrough immersed a wärbarea mold part with an in-mold cavity located outsole made of elastomer and works with two located above the opening side moldings and a aufgeeisteten shoe upper sum forms a polyurethane midsole.

The outstanding for polyurethane blends for the outsole and for the midsole have essentially polyol and isocyanate and chain extenders and catalysts, each 4ach the required material properties for the outsole or midsole - the outsole should

abrasion resistant, the Zwischenjohle be elastisoh and have a pore structure - are set by appropriate additives

When mixing the components already start the chemical reactions. The mixtures react in the molds to the outsole or "midsole. When reacting the mixture for the midsole at the same time the Zwiachensohle is formed and the connection made with the shoe upper and the outsole »

The outsole of elastomer and the midsole of polyurethane are connected in the region of their interface by chemical bonds between isooyanate and reactive Bndgruppen of the elastomer added to each other, ·

The mixtures which react to form polyurethane are mixtures based on ether or ester polyols, based on 100 parts by mass

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

respectively"

The catalyst used is, inter alia, the catalyst DABGO-SB commercially available under the trade name of Pa · Airproducts «

The outsoles are made of elastomers which can be mixed with the following chemical compounds or »chemical substances in a mass fraction of 0-20 %, based on the amount of chewing gum). B * Aoryl- * Nitryl-Kautschule, styrene-butadiene-rubber, natural-Kautsohuk, Ohloropren-rubber »

The outsoles can generally be made from all known rubber qualities, if z. B, the following substances in a mass of 0 - 20 % (mass based on the rubber used) are gemiziso}

- Phenolformaldehydharze, z. B, j Vulkadur A (Bayer AG), Coretack (BASF)

- Methylolierfce phenolformaldehyde resins, eg. B ₀ J SP 1045 (Krahn) Korever (BASF)

- Resorcin in connection with a formaldehyde donor, z. B: Gohedur A)

Cohedur RS) (Bayer AG) Cohedur RK)

- Silica FUllstoffe, z. B ₀ s

Vulkasi. "S (Bayer AG) Ultrasi? .. (Degussa)

- Aminoalcohol, z. B. <3 - amino-propanol

primary or secondary amine, e.g. B .; stearylamine

- Polyvinyl alcohol, z. B.j

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

- High hydroxyl group-containing polyol, eg. B.j

Formrez (Witco)

Acrylic rubber (ACM) z, B, Hydrin (Polysar),

Herclo (Hercules), or "a combination of the above substances.

Forming the elastomer outsole is done by plasticizing the elastomers at the usual processing temperatures and injecting them into the appropriate mold cavities according to conventional technique in injection molding machines with correspondingly high pressures. "

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 sole to be formed and then the mixture reacting with the polyurethane is brought into contact with the molded outsole, wherein in the forming Boundary layer of the elastomer and the reacting polyurethane reacts isocyanate with reactive end groups «

In controlling the temperature of the elastomer, use is made of the fact that a temperature increase or a decrease of 10 ^° C. leads to a shortening or an extension of the vulcanization time, ie. the time it takes for the elastomer to fully react by 50%

leads,

The cooling rate of the elastomeric outsole formed to the temperature at which the mousseurous polyurethane moussecombined mixture is supplied to the mold cavity for the bisecting sole is substantially determined by the high heat capacity of the molded parts disposed on the pivotable mold carrier and also by that of the pivotable mold carrier.

This cooling rate has the consequence that the time for shaping and cooling an outsole is substantially greater than the time required to form the midsole ₀

Aim of the invention

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

Explanation of the invention of the invention

The invention is the'Aedgabe form stations, in particular for round tables, for molding shoe soles with an outsole made of elastomer and a midsole ausreagierendem a polyurethane mixture of isocyanate and polyol on shoe shanks in such a way that the cycle times of them equipped with them Rotary table systems correspond to the cycle times of rotary table systems for molding running and midsoles of polyurethane, so that optionally on a rotary table system at the same time

Soles made of elastomer or polyurethane and a polyurethane midsole "

This object is achieved according to the invention in that the in the height-adjustable traverse pivotally mounted molded part on one, parallel to the second height-adjustable traverse side cooperating with the heated plate molding with the mold cavity for the outsole and that on the other side of the swivel mounted mold part carrier is a cooled, acted upon with vacuum molding with a mold nest for the acquisition of the outsole and its pivoting in the working position for forming the Zwiachensohle is arranged

By these measures it is achieved aaß the times for vulcanization and cooling of the molded elastomer molded outsoles are separated from each other, whereby it is especially possible to vulcanize the outsoles during a predetermined number of working cycles of the rotary table system in the closed heated mold and only then to open and bring into the working position shortly before reaching the device for mixing the mixture ausreagierenden to polyurethane «,

AusführunKsbeispiel

The invention is explained in the drawing with reference to a Ausführungsbeiflpiels. Show it*

1: schematiach a top view of a rotary table J

FIG _e 2 - 6: a side view of the exemplary embodiment of the forming station in different working positions,

FIG. 1 shows a top view of the rotary table system shown schematically. It has a rotary table 1 on which 14 mold stations 2, shown schematically by squares, are arranged. The squares also indicate the positions occupied by the mold stations when the rotary table is cyclically warmed up. In the present case, after 15 cycles or steps of the rotary table 1, each mold station 2 has reached its original position again. These positions are denoted by 2 _Q1 to 2 ^.

At the periphery of the rotary table, the plasticizing and injecting unit 3 for an elastomer is arranged so that after each working stroke with one of the mold stations 2, which has then taken the position 2 _Q1 , is brought by a radial displacement to the rotary table into engagement, which by the Double arrow is shown symbolically. Once the plasticizing and injecting unit 3 engages the forming station 2, elastomer is injected into the mold cavity for the outsole. "

V / eiter is also arranged in the radial direction of the rotary table displaceable means 4 for mixing the ausreagierenden to polyurethane mixtures * After each power stroke, this device 4 is also with one of the mold stations, which was in the appropriate working position 2 _Q ^ ge * · · turned, engageable so that a midsole is formed. Depending on the reaction or vulcanization time of the materials used both aggregates

also be exchanged against each other »

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

FIG. 2 shows the molding station 2, the molded parts for shaping the outsole and the molded parts for forming the intermediate sole in its closed position.

The mold station 2 has four guides 5, of which only two are visible «

The guides 5 form with a fixed cross member 6 and a breakthrough 7 having traverse 8 sinen fixed guide ungarahmen for di.e hc'henver st ellbare Traverse 9 with the pivotally mounted in her about bolt 10 Formteilträger 11 »

Below this height-adjustable traverse 9, the second height-adjustable cross member 12 is arranged

The height-adjustable crossmember 12 has on its side facing the crossbeam 6 a Formzuha] cylinder 13 and on its the height veratellbaren Trave / ne 9 side facing a heated plate 14 on «

On the traverse 6, the two drive cylinder 15 are fixed, the piston rods 16 are connected to the height-adjustable cross member 12.

2 7 0 2

The pivotally mounted mold part carrier 11 has in the position shown in Figure 2 on its side facing the crossmember 12 on a mold part 17 with a nest 18 which has the dimensions of the outsole to be formed "The mold part 17 is disposed on a heating block 19, the above the insulating plate 20 is connected to the pivotally mounted molded part carrier 11 is ₀

The molded part support 11 has on its second, facing away from the displaceable cross member 12 and parallel to its side a cooling plate 21, which is flowed through by a coolant. On her a mold part 22 is arranged.

This form part 22, which is selected from the cooling plate, has a mold cavity 23 which corresponds to the dimensions of the outsole. The mold part 22 has in the Formennes +. 23 outgoing channels connected to a non-illustrated vacuum system «

Within the traverse 8 and above its opening 7, the two side mold parts 24I 25 are arranged, which limit an opening in its closed position, with a listed on the strips 26 shoe upper 27 and the fermentation part 22 Di.lt the formed outsole, not shown, the Mold cavity for shaping the midsole limited «

Since injection molding of the elastomeric outsole results in high injection pressures which are comparable to those of injection molding machines for processing thermoplastic material, it is necessary, in accordance with the procedure described in US Pat.

Casters Conventional technology to provide both the drive cylinder and the mold holding cylinder,

As seen in Figure 2, during injection of the plasticized elastomer in which the shaped part 17 delimited by the heated plate 14 and in its closed position, the nest 18, the reaction force applied over the formed by the cross members 6 \ 8 frames, wherein the pivotable mold carrier supported on the cross member 8 in the edge region of the opening 7

The height-adjustable cross member 9 is taken during the process of traverse «Between the two trusses compression springs are arranged so that in the position of the drive cylinder according to Figure 3, the trusses occupy the positions shown«

FIG. 2 shows the positions of the traverses of the molding station 2 in the position 2 _Q1 (see "FIG. 1)".

In this position, the plasticizing and injection unit 3 is moved in the radial direction of the mold station and is against the gate, (not shown) of the nest 18 to «

The nest 18 remains closed until after a corresponding number of working strokes of the rotary table, the forming station from the position 2 _Q1 after reaching the positions 2 ₀₂ , 2 ₀₃ , 2 _O4 , .... 2 ₀₈ , 2 _O9 , 2 ₁₀ position 2 ₁₀ has reached again «,

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In the again reached position 2 ^ have been according to Figure 3, the drive cylinder 15 acted upon so that the two height-adjustable trusses 9 | 12 take the apparent from Figure 3 position.

In this position, 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

As can be seen from FIG. 3, the sprayed outsole L is located on the heatable plate 14.

In the position 2- .. the mold station dip driving cylinder 15 are acted upon so that the height-adjustable trusses 9 | 12 have the apparent from Figure 4 position, that is, forming station closed

By applying a vacuum or negative pressure to the cooled, corresponding holes having mold part 22, the outsole comes in the mold cavity 23 of the molded part molds 22 to plant, In this position according to Figure 5, the mold station continues to demolding of the finished article and for mounting a new shoe upper 27 on the leioten 26 in the positions ² 12 ^{J 2} 13 ^{UAd 2} 14

Subsequently, the drive cylinder 15 and the pneumatic cylinder are acted upon so that the height-adjustable trusses 9 | 12 take their appropriate position.

In the position 2 ^ the ver pivotable mold part carrier 11 is again pivoted by 180 ° and the driving cylinder and the pneumatic cylinder are applied accordingly, so that the height-adjustable trusses 9 | 12 take their apparent from Figure 6 position.

In this position of the height-adjustable traverses, which is shown in FIG. 6, the mold station is moved from position 2 to position 2 _Q1 , at the same time the side moldings 24, 25 being brought into the closed position.

On the breakthrough of the two in the closed position side moldings 24} 25 a last patch with a aufeisteten shaft patch

In this position, the elastomer sole is injected again first. Subsequently, after the transfer of the forming station to position 2 _Q 1, the polyurethane completing mixture for the formation of the midsole is fed to the mold cavity, the outsole and the shank by means 4, after being engaged by a radial displacement to the rotary table has been brought to the runner, not shown, which limit the two side moldings in their closed position and which is in communication with the mold cavity for the midsole.

From 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 2q. or 2 _{14 taken} in a Entnähmestation a finished shoe

is, on the shoe upper a sole with an outsole made of an elastomer and a Zwisohensohle polyurethane is formed ·

The inventive design of the mold station thus creates 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, the device for mixing the mixture reacting to polyurethane and the plasticizing and injection unit for the elastomer must then be arranged, for example, one above the other or diametrically opposite one another,

A particular invention essential advantage of the device according to the invention is that different Forinenteile be used for the vulcanization of the molded outsole made of elastomer and for cooling the ausvulkanisierden 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 for cooling the outer soles.

Claims (1)

Berlin, 15.08.1988 AP A 43 D / 308 620-6 69 238/26 Patient claim Forming station, in particular for rotary table systems, for molding shoe soles with an outsole of elastomer and einar Zwischenosohlö from a auureagierendem to polyurethane Gomisch isooyanate and polyol on shoe shanks, wherein the Zwisohensohle and the outsole by chemical bonds between isooyanate and reactive end groups of. Elastomer added substances are interconnected, the mold station has a height-adjustable traverse with a pivotally mounted mold carrier with at least one heatable molding for molding outsoles and below this Traverse a height adjustable second Traverse with ^ iner heatable plate is arranged with the heated mold part of pivotable Formt-ailträgers cooperates to form outsoles, and the pivotable mold carrier cooperates with side moldings and aufgeeisteten shoe shafts for forming the mids, characterized in that in the height-adjustable cross member (9) pivotally mounted mold carrier (11) on the one, the second höhenveratellbaren Traverse (12) parallel side with the heated plate (14) cooperating molding (17) with the nest (18) for the outsole and that on the other side of the pivotally mounted moldings rs a cooled, acted upon by vacuum molding (22) is arranged with a mold cavity (23) for the acquisition of the outsole and its pivoting in the working position for forming the Zwisohensohle * For this 6 pages drawings