DE737012C - Process for the production of synthetic resin molding compounds - Google Patents

Description

Method of making synthetic resin molding compounds During manufacture The necessary homogenization takes place in molding compounds based on curable synthetic resins and pre-hardening of the mixture in mixing and kneading devices, in particular the last phase of processing is usually carried out on mixing rollers.

The mixing rollers, which consist of two against each other and achieve one Friction effect with different circumferential speeds revolving, for heating and cooling set up rollers exist, due to their mode of operation discontinuous operation. This discontinuity limits performance and does not guarantee uniformity of the mix. Furthermore, through the Discontinuity of the rolling operation also that of the further processing of the molding compound serving facilities (crushers, mills, filling and transport facilities, etc.) can only be fed intermittently, although they are usually fed continuously Operation are suitable. This results in idle times in overall operation that on the one hand on the production costs and on the other hand on the quality of the molding compound have an unfavorable effect.

In order to avoid these disadvantages, a known method has been worked out has been made after the press mixes in a continuous way in the manner be that the well powdered and intimately mix ingredients of resin and Fillers, dyes and possibly catalysts between two endless, belts moving on roller pairs are exposed to high pressure and temperature will.

This creates a kind of endless press compound, which after Detachment from the belts with knives, which are located on the end pairs of rollers, is crushed and processed.

The method of the present invention for making synthetic resin molding compounds from curable synthetic resins, fillers, dyes and other additives the components on several rolling mills combined to form a rolling mill processed now differs fundamentally from the method described above in that that a skin is first rolled out on each of the individual mixing mills, this one with the help of separating devices for each rolling mill, which are passed through a common Drive are simultaneously brought into their working position, cut off and on the following rolling mill; is transferred where the previous process is repeated.

The number of individual mixing rollers depends on the requirements the respective molding compound. The spatial arrangement of the roller train can be horizontal, be made vertically or at an incline like a staircase.

The method according to the invention is intended to improve the Method in particular the advantage can be achieved that the uniformity of the mixed product is improved. The features of this process are illustrated in the drawing in the two different phases of the mixing process are shown explains: Es For example, four mixing rollers I, 2, 3, 4 are arranged one behind the other to form a line. Fig. I shows the roller train in the mixed state (phase I). All four mixing rollers are surrounded in this state with a closed mix belt c, whereby the Mixture pre-hardened and as a result of the friction of the rollers running against each other is homogenized. The rollers run synchronously with each other. The one arranged over roller I. Feeding system a is closed during this phase As can be seen from the drawing As can be seen, the stiffeners d of all mixing rollers are coupled to one another, with their joint movement can be done mechanically or electrically by hand or automatically can. When moving these, coupled scrapers 4 are simultaneously on all Roll the closed and still plastic molding compound bands formed during phase 1 c cut open and steered onto an interception device. This device can from a rigid slideway or from an idling or powered transport hand exist and has the purpose of receiving the unwinding tape from the roller and at the same time forward to the next following roller (phase). This is done first by roller I free, but loaded with new mix at the appropriate moment, that can be fed by hand or automatically through the loading device a. At the same time] runs onto the last roller train of the roller train (roller 4) finished rolled and cut molding compound tape, which for the purpose of mutual Smoothing and complete stretching, if necessary, passed through smoothing rollers 5 can be. For the safe diversion of the according to phase II from one roller to the next running belts can (not shown) deflection devices, such as scrapers with a subsequent guideway. The transport device e can in the case of a vertical or inclined, stair-like arrangement of the roller train, these are missing.

In this process, the long-term mixing process that has been customary up to now, as it is necessary on a single unit, by interconnected and In their controls coupled and synchronously running mixing units in uninterrupted successive short-term mixing processes divided. Here the first The roller of the roller train preferably has the task of providing a sufficiently strong mix of material to form, which for further homogenization and final pre-hardening on the The next following roller is forwarded to the end of the row of rollers as the finished one Aiischgutband, if necessary after passing through a smoothing roller, discharged to become. In this way, a short-period or approximately continuous Working method, a mixed product is achieved with a particularly high level of uniformity.

Claims (1)

PATENT CLAIM: Process for the production of synthetic resin molding compounds from curable synthetic resins, fillers, dyes and other additives the components on several rolling mills combined to form a rolling mill are processed, characterized in that on each of the individual mixing mills First a skin is rolled out, this with the help of separating devices for each Rolling mill, which by a common drive at the same time in their working position are brought, cut off and transferred to the following rolling mill, where the previous process is repeated.