DE1685383A1 - Method and device for molding rubber soles with a pore structure (Poro rubber soles) on shoe shafts - Google Patents

Description

Note: Desma-Werke GmbH.

2807 Uesen near Bremen
Desmastrasse 112

"Method and device for molding soles out of rubber with pore structure (Poro rubber soles) on shoe uppers

The invention “relates to a method and device for molding rubber soles with a pore structure (PorOi-'rubber soles). Shoe uppers, with a one slidable headstamp having sole shape on which the shoe upper is placed with a last is.

Rubber soles with a pore structure are produced according to DAS 1 102 009 in the same way and at the same time Shaped on a shoe upper, that a rubber compound provided with blowing agent as the starting material is placed in a vulcanizing mold. This in the The starting material inserted into the sole form is subjected to the action of heat and pressure through the headstamp on a small volume compressed and liquefied *

209813/0028

Finally, the sole shape is made to a larger volume by lowering the bottom stamp to form the pores expanded and at the same time the sole is fully vulcanized In this process, in which the soles with pore or micro-cell structure are vulcanized onto shoe uppers are relatively long vulcanization times required because the starting mixture is poured cold into the mold by hand and the pores that form as Insulation work and severely hinder the passage of heat.

In an earlier application (D 49 660 X / 39a) a method has already been proposed in which soles made of injectable, compact material, such as rubber or plastic, are injected onto shoe uppers by first placing an amount of material corresponding to the sole in an internal cavity _f which is larger than the finished sole, is injected and only after the injection has ended is the mold cavity for solidifying and shaping the material of the sole and its simultaneous connection with the shoe upper reduced to the size of the finished sole. This is about_ the injection molding of soles made of compact material onto shoe shafts

The invention is concerned with an improved method for molding rubber soles with a micro-cell structure

20981370025

to Schuhschäf te "Here" should according to the invention underlying task is the "previously required manual." Work and the considerable time required to vulcanize the rubber mixture on and off can be avoided. -..- '""

The invention consists in that one provided with blowing agent Rubber mixture is introduced into the sole mold by means of an injection machine and that after a specific time the mold cavity of the sole mold on the final sole thickness is increased, with expansion Pore formation in the rubber compound.

The inventive method has different gate parts * First of all, the hitherto customary manual introduction of the Starting mixture for the sole in the sole shape avoided, because the material is injected with an injection machine in an injectable state. Still exists the advantage that the material is not in a cold state, but at a relatively high temperature can be introduced, for example from about 110 Ge It is then much easier to further heat the sole material in the mold to approx. 160 °. So it will be after the method according to the invention, the time for insertion the rubber compound from Hani and the longer vulcanization time previously required.

209813/0025

Another essential feature of the invention is that one of the sole -First correspondingly metered amount of blowing agents-provided rubber mixture by means of an in; jektionsmaschine in an enlarged mold cavity of the sole form is introduced to the bottom stamp of the sole form ⁼ then powered up and the rubber mix of the shoe upper is pressed "and that finally, after a certain time, the mold cavity is expanded to the final sole thickness with expansion and pore formation of the rubber mixture.

In this method according to the invention, in addition to the advantages already listed, there is another advantage achieves that during the introduction of the material in the sole shape no disadvantageous pressure build-up takes place within the sole shape. Therefore this is special advantageous = because the use of rubber has higher injection pressures requires, so that in itself a considerable stress on the sealing surfaces between the shoe upper and Sole shape, in particular in the area of a sealing lip of a surrounding mold frame that occur after the The proposal of the invention is omitted. Through the diminished Pressure during injection within the sole shape also eliminates the risk of getting between the shaft and the sealing lip Material leaks out of the mold frame This is

2-0 9 8-1 3/002 6

achieved by that only one according to the finished Sole dosed amount of G-ummimisehung in an enlarged The cavity is entered through an injection machine and only then the shape cavity is reduced in size is, whereby due to the contact pressure, the rubber mixture is well distributed in the sole shape and on the upper part of the shoe is pressed.

Another Iösungsweg according to the invention is, that initially a dosed amount of a rubber compound provided with blowing agent according to the sole an injection machine into a lumen cavity of the sole mold is introduced, which is larger than the -finished "sole is and that only after completion of the injection process, the mold cavity by moving the bottom punch under simultaneous distribution and shaping of the rubber compound reduced to one size on the upper part of the shoe which is smaller than the volume of the finished sole, initially immediately after the injection has ended during a first part of the reduction of the organ cavity a relatively low pressure (flow pressure) on the material for its even distribution over the entire cavity and then afterwards during a second part of the reduction of the lorminal cavity a much higher pressure (final deformation

20 9813/0025

pressure) is exerted on the rubber compound and then after a certain time the mold cavity enlarged to the final sole strength with simultaneous expansion and pore formation "of the rubber compound will. The reduction in size of the mold cavity using an initially low flow pressure and then a higher pressing pressure has the advantage that the Rubber compound can distribute under the relatively low pressure in the mold cavity. After a certain period of time, which must be set depending on the material, would then be switched to high pressure so that the soil » stamp mtd. a comparatively high pressure against the Rubber compound is pressed. During this stage of the process, the final subtleties of the sole, such as the Example the engraving, shaped. In addition, the rubber compound is applied with the necessary pressure against the shaft pressed to achieve a good connection. The pores are formed during the subsequent enlargement of the mold cavity by lowering the bottom punch.

With the method according to the invention, rubber soles with a perennial structure are obtained in a simple and rapid manner, with the finished soles being good, durable Having a connection with the upper part of the shoe and also as a result of that look good under high pressure *

209813/0025

₇ _ 1B85383

The method according to the invention and a device to carry out the procedure are referred to below Hand of the drawings explained. It shows:.

Pigο 1: in longitudinal section a device for carrying out a method according to the invention,

Fig. 2: a device in longitudinal section for implementation another method according to the invention.

The inventive devices consist of one Molds 10, which in the illustrated embodiments is divided in the longitudinal direction. In the drawing, only one half of the mold frame 10 is shown in plan view. A headstamp 11 can be moved vertically within the mold frame 10. In the parting line of the two Halves of the mold frame 10 is an injection channel intended. This serves to introduce the rubber mixture provided with blowing agent into a mold cavity 16 for Recording of a sole 17 made of rubber with a pore structure. From above on the mold frame 10 is a strip 13 with raised Upper 14 put on. The shoe upper 14 coinmt sealingly with sealing lips 15 of the running around it Fornenrahmens 10 to the system. The mold cavity thus formed 16 is limited by the mold frame 10, the headstamp 11 and the last 13 with the shoe upper 14 *

In the embodiment of Figo 1 \ v is in one by 2 0 9 8 13/0025

Dotted line position a .des bottom tempe Is 11 a ί'ϊ'Ρίι, Vf-f i> ^{| IJ} '"■' .- '■" I ¹ " ™ * ⁺ blowing agent.

"provided rubber compound over the injection port 12 in entered the mold cavity 16 ,, the mold cavity 16 is in this starting position of the bottom stamp 11 smaller than the volume of the finished sole 17 with Pore structure.

When the rubber lining provided with blowing agent has been entered into the mold cavity 16 according to the dot-dash position '' ^{5 of} the headstamp 11, after a certain dwell time the headstamp 11 is moved down to the position shown by the solid line. This allows the rubber compound to expand under the action of the blowing agent while at the same time forming the pores »

The rubber compound is at a relatively high Temperature of, for example, 110 ° C is injected and heated in the device to approx. »160 °« Introducing the rubber compound at a relatively high temperature, the vulcanization of the rubber compound is in the device is considerably reduced.

In the device shown in Mg.2, the inventive Process carried out in such a way that the rubber compound provided with blowing agent over the inlet

2098 13/0025

Injection channel 12 initially at a position c of the bathing stamp 11 is introduced, which is shown by the dashed line. The mold cavity 16 released is larger than the interior of the final, finished sole 17. In this position of the bottom stamp 11, the mouth T2a of the injection channel 12 becomes the lorraen cavity 16 released. 'This mouth 12a lies below the sole running surface 17a of the finished sole

After introducing the dosed gum mixture, the Headstamp in the one shown by the dash-dotted line Position d driven, with preferably initially a low flow pressure on the introduced G-umrai mixture and then an increased pressure is applied. In this position d of the headstamp, the opposite one The mold cavity forms the final volume of the sole, the rubber compound is applied to the shoe upper 14 pressed and well distributed in the mold cavity. The headstamp is then lowered into the third position e according to the solid line. This position corresponds to the final size of the sole 17. By enlarging the mold cavity 16. the rubber mixture can expand under the action of the blowing agents and form the desired pores.

20 9813 / Q02I originally inspected

Due to the special arrangement of the injection channel

According to FIG. 2 it is achieved that the finished sole is free of sprue. The upward movement of the The existing sprue at the mouth 12a of the injection channel becomes the bottom stamp from the position α into the position ö 12 cut off. This becomes the outer The appearance of the edge of the sole is improved and it is no longer necessary a subsequent cutting off of the sprue.

2098137 0025

Claims (2)

Ans ρ r ü c h e. 1. Method of molding rubber soles with Pore structure (Poro rubber soles) on shoe uppers, with a Solilenform with a movable headstamp on which the upper part of the shoe is attached with a last is attached, characterized in that one with A rubber compound containing blowing agent by means of an injection machine is introduced into the sole mold and that after a certain time the lOrmenhohlranm the sole shape is enlarged to the final sole thickness, with expansion and pore formation of the GuBimimis chung * - 2. The method according to claim 1, characterized in that that initially an amount dosed according to the sole Rubber mixture provided with blowing agent by means of an injection machine into an enlarged porm cavity the sole shape is broken into, that then the headstamp booted up the shape of the sole and the rubber compound is pressed against the shoe upper and that finally after a certain time the mold cavity on the final sole strength is expanded with expansion and pore formation of the rubber compound. 2098 13 / 002Sif or similar _BATH 3- The method according to claim 1 or 2, characterized in that that first of all one of the sole, appropriately dosed amount of a rubber compound provided with blowing agent is introduced into a mold cavity of the sole mold by means of an injection machine, the larger than the finished sole is and that only after completion the injection process of the mold cavity by process of the bottom stamp with simultaneous distribution and shaping of the rubber mixture on the shoe upper a size is reduced which is smaller than the volume the finished sole! initially immediately after the injection has ended during a first part of the reduction of the mold cavity a relatively low pressure (flow pressure) on the material to make it more uniform Distribution over the whole porm cavity and then then a much higher pressure during a second part of the reduction in the mold cavity (Final deformation pressure) is exerted on the rubber compound and then after a certain time the mold cavity enlarged to the final sole strength with simultaneous expansion and pore formation of the Guinmi mixture will. . 4ο device for carrying out the method according to one or more of claims 1 to 5, the shape of which ^209813/0025 BADOPANAL cavity through a divided 3-mold frame with injection channel in. its parting line, movable headstamp and attachable last with shoe upper is formed, thereby gkennzelehnet that the dog (12a) of the injection channel (12) to the core cavity (16) is in a known manner in the mold frame (10), but is provided below the running surface (17a) of the finished sole β Pur d en registration; Di.pl.-ing. Hcns M ^ Bremen, June 29, 1966 Dipl.-lug, Ench.'lH- * >> H 3. * Ο "· '" Π er * note; Desma-Werke GmbH »s _levog r _s , _f0 Be21, .Teieton31IIII 2807 Uesen near Bremen
Desmastrasse 112 209813/002 5 AU Blank page