DE1679880A1 - Device for the continuous preparation of plastic masses - Google Patents

Description

Werner & Pfleiderer

7000 Stuttgart-Feuerbach
Theodorstrasse 10

Device for continuous processing plastic masses

The invention relates to a continuous preparation of plastic masses from powdery and / or granular starting materials certain establishment in which a cooperating, with its profiles interlocking A pair of rollers is provided, between whose rollers rotating against one another there is a gap.

When preparing the raw materials for production plastic masses result in a series in particular

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of problems when it comes to temperature-sensitive mixtures j is the example of powdery or granular Starting materials are produced in which to plasticize or gelling, certain temperatures must be maintained.

To plasticize and gel these starting materials one has In practice, already provided roller pairs, which are rotatably arranged within a closed housing and with interlocking Profiles are provided. However, such an arrangement is due to the unchangeable The position of the two rollers to one another always remains the same the working gap and difficulties with respect to an exact adherence to predetermined working temperatures, since the discharge the heat generated during plasticizing or gelling the housing must be done. For this reason, a previously known Device designed the housing as a heat exchanger. (British Patent 593 799) It is known that the Heat management is particularly difficult if that Item to be treated not over its entire treatment path can be heated evenly and thus the temperature is not uniform during the course of treatment.

The invention is based on the object of a continuous lent preparation of plastic masses, preferably such from powdery and / or granular raw materials, to create a certain facility in which it is possible with the least amount of construction effort, especially without Using a housing and a cooling device required for this, the desired degree of plasticization of the treated To achieve mass in a simple manner and at the same time ensure optimal homogeneity of the mixture to ensure continuous discharge,

This object is achieved according to the invention essentially in that the with different peripheral speeds driven and with respect to their gap width adjustable rollers of the roller pair with their entire working length free-

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lying abirischen two storage racks are arranged, one of the rolls acts as a work roll on which the plastic Compound in a thin layer to one on one or both end faces of the work roll and the counter roll cooperating with this intended acceptance body is promoted.

Thanks to the rollers that are exposed over their entire working length and the processing of the masses in thin layers, preferably in thin boundary layers, ensures that only optimal shear * by determining the temperature of the work roll depending on the item to be treated Icruppen can be made effective without the risk that the quality of the material to be treated, for example by impermissible spxtent temperatures, is impaired at any treatment site »

According to a further proposal of the invention, the entire Working length of the folds divided into individual working sections be, advantageously the width of the between the the gap between the two rollers is adjustable * By this measure, both the working length of the rollers and thus the residence time or * treatment time of the starting materials as well as the effectiveness of the applied Shear forces are determined. According to the invention shear rates of over 3 m / sec applied without that the material to be treated is adversely affected.

The gap width is expediently changed by a Adjustment of one or both rollers in the direction of the bearing stand /. The arrangement can also be made so that an area over the entire working length or a bad area individual working sections of different widths, for example of a steadily increasing or decreasing order of magnitude results. The entire working length of the rollers could also be be divided into two working sections, where the thread-like Profiling from the middle of the entire work

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run evenly towards the ends of the rollers. In In this case, the supply of raw materials can be applied to the two Rolling takes place approximately in the middle of the entire working length » so that the treatment and the discharge to both ends is made. If necessary, the entire working length of the rollers can also be divided into several sections of the same type extending profilings be subdivided, the individual working sections of non-rotatably on a shaft . applied rings are formed, the. on their outside have an interlocking thread-like profile. *

To find the effective working length of the rollers in each case To determine manner, a further proposal of the invention goes into. supply member provided above the rollers for the starting materials adjustable in the direction of the nip to arrange. - For rollers with from the middle of the total available working length to both ends running working directions can.auch two feed members are provided, which are then adjustable within the working length of the rollers assigned to them.

Depending on the course of the thread provided on the rollers like .. Profiles are according to the invention on one or on both roll front sides idxnradbgenössoctcolckear for the parallel mass escaping to the longitudinal axis of the rollers below the center of the roller arranged purchase organs provided »The form of the takers can be different and will be primarily depend on the type of item to be treated. In this context, each of the slimming organs can also have a granulating unit be assigned with rotating granulating knives, the axis of rotation of the granulating knives both parallel and transversely can be arranged to the longitudinal axis of the rollers.

As already mentioned, the shear or working speed is the work roll of the device according to the invention over 3 m / sec. In connection with this high working speed

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with the setting of one for given raw materials favorable working gap between the profiles of the two rollers and a favorable surface quality the profiling of the work roll and / or the counter roll will produce optimal results in terms of both Plasticization and / or gelation of a certain mass as well as temperature control and a continuous one Discharge guaranteed.

The rollers, which work without a housing, also enable rapid, flawless degassing of the mixture, if any such is necessary, and also easy and precise observation of the work process as well as a simple possibility of cleaning the individual coming into contact with the mass Parts, resulting from the union of the aforementioned features This results in a simplified construction, which nevertheless has an optimal material throughput with the best quality of the finished product guaranteed.

In the drawing, the invention is shown in exemplary embodiments; show it:

Fig. 1 shows a device for continuous Aufbe- ' ride sculptural masses in view,

FIG. 2 shows a side view of the device according to FIG. 1, FIG. 2a shows a cross section through a pair of folds,

Fig. 3 is a plan view of the pair of rollers of the device according to FIG. 1 in a simplified representation,

Fig. 4 shows a modified embodiment of a Pair of rollers in plan view,

FIG. 5 is a view of the pair of rollers according to FIG. 4,

Fig. 6 shows a further modification of a pair of rollers in plan view, and

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Fig. 7 shows a detail of a work roll of the in-line. direction according to Fig. 1,

On a base plate 1 are two at predetermined intervals Storage stand 2 arranged in which rollers 3 »4 against each other are rotatably mounted. The rollers are driven by a motor 5, possibly via interposed gears or coupling elements 6.

As shown in Fig. 2 of the drawing, the mutual distance is of the two rollers 3 »4 assigned by the two warehouse stands 2 Actuators 2 'adjustable so that, depending on the particular item to be treated, the most favorable roller spacing, so the width of the working gap is adjustable.

As can be seen from FIGS. 1 and 2 of the drawing, a removal element 7 is provided below the roll center in the area of the roll gap, which feeds the material to be treated, which emerges axially as a strand, to a granulating device 8. This consists of several rotating knives 8 ¹ , and at. In the illustrated embodiment, the axis of rotation is arranged parallel to the axis of the rollers 3 » h .

As illustrated in Fig. 3 of the drawing, the rollers are 3 »4 over their entire exposed between the bearing stands 2 Working length with a thread-like profile 9 provided, the slope of a feed organ 10, which is in Fig. 3 of the drawing is indicated by dash-dotted lines, to which Customer 7 runs on the opposite roll face. The feed member 10 is, as shown in Fig. 1, Arranged over the .Walzenspalt and in the longitudinal direction of the rollers 3> 4 adjustable.

In this way, the actual working length of the rollers 3, 4 and thus the treatment path for the mass as well as its dwell time in the profiles of the working roller 3 »4 can be determined and regulated. * _v

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As FIG. K of the drawing shows, the profiling can also be designed in such a way that the threads run from the center of the roll to both end sides. In this case, take-off members 7 serve on both roll front sides to take off the material to be treated 11 emerging from strand filings, as is illustrated in FIG. 5 of the drawing. In this arrangement, too, the distance between the two rollers 3 '' ^ 'from one another can be determined in a simple manner by an actuator 2 ^{1 shown in FIG.}

According to the embodiment illustrated in FIG. 6 of the drawing The gap provided between the roller profiles can also be used by the feed member 10 for the starting materials from your decrease organ 7 to become smaller and over the entire Roller length or its working length be conical *

Finally, FIG. 7 of the drawing shows a possible embodiment one or both rollers in such a way that the working length is divided into individual working sections, each working section being formed by a ring 12, which is pushed onto the shaft 13 and via wedges I ^ with this is rotatably connected. The axial securing of the individual rings 12 can then by additional disks 15 or the like. be made. The width of each work section according to the rings 12 can as well as their Different diameters can be selected. '

The entire working length of the rollers could also be formed by only two sections, which are then pushed onto the shaft 13 as shown in FIG. K of the drawing and connected to it in the manner mentioned. This arrangement offers the advantage that the type of profiling, in particular its surface properties, such as roughness, and possibly also its material can be selected differently.

When the facility is commissioned, the raw materials given by the feed member 10 in the nip of the counter-rotating rollers 3, ^, between de-

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They then benefit from the high shear rates of approx. 3 m / sec or more 'quickly plasticized or gelled where by a repeated pass of the mass ensures intensive treatment of the mixture in thin layers on the work roll through the treatment gap will. At the same time, proper degassing takes place and the given limit temperatures are adhered to made possible in a simple manner. In addition, the mixtures must be observed over the entire working length of the folds possible, so that also, if necessary, a "change, for example the shear rate and / or the temperature brought about can be.

That on one of the two roll front sides depending on the requirements of the Type of roll profiling provided take-off member 7 directs the finished mixture, which emerges continuously as a strand, if required by the granulating device already described or to any other processing point.

The invention is not limited to the exemplary embodiments shown; rather, various changes are possible, for example with regard to the adjustment of the two rollers and also with regard to the profiling. This also applies to the arrangement of the feed member and the drive as well as to the type of storage of the rollers. Which of the two rolls is designed as a work roll ψ depends on the type of item to be treated. In any case, the mass on the work roll is brought through the nip in thin boundary layers and conveyed on as a newly mixed layer.

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Claims (1)

_ - 9 ~ P a te nt a η s ρ r ü c Ii e 1,) Device for the continuous preparation of plastic masses from powdery and / or granular starting materials, in which a collaborative, interlocking Profiling provided roller pair is provided, between its mutually revolving Folding there is a gap, characterized in that the Driven with different circumferential speeds and adjustable with regard to their gap width rollers (3, V) of the pair of rollers with their entire working length exposed between two bearing stands (2) are, wherein one of the rollers acts as a work roller on which the mass (II) in thin layers to one on one or both end faces of the work roll and the take-off device (7) provided with it interacting with it is promoted. 2.) Device according to claim 1, characterized in that the total working length of the rollers (3 »^) is divided into individual working sections, 3.) Device according to claims 1 and 2, characterized in that that the width of the gap between the two rollers over the length of individual working sections of the rollers (3 »Ό is different, 4,) Device according to claims 1 to 3 »characterized in that that the gap width by a radial adjustment of one or both rollers (3 * 4) in the bearing stands (2) is changeable, 5.) Device according to claims 1 and 2, characterized in that the entire working length of the rollers (3, k) is divided into two working sections, in which the thread-like profiles from the middle of the entire working length evenly to the ends of the rollers (3 ¹ , V) run towards 20 9811/0519 6.) Device according to claims 1 to 4, characterized in that that the entire working length of the rollers (3 »4) is divided into more than two sections with similarly extending profiles. 7 «) Device according to claims 1 to 6, characterized in that that the individual working sections are formed by rings (l2) which are attached to a shaft in a rotationally fixed manner and which have a thread-like ring on their circumference Have profiling. 8.) Device according to claims 1 to 7> thereby marked- ' shows that a supply member (10) provided above the roller gap for the starting materials in the direction of the nip is adjustable. 9.) Device according to claim 1 and following, characterized in that that in the area of the provided on one or both roll front sides decrease.s parts for the parallel mass escaping to the longitudinal axis of the rollers (3> 4) a removal element (7) attached below the center of the roller is provided, 10.) Device according to claim 9 »characterized in that that each of the removal organs (7) is assigned a granulating unit (8) with rotating granulating knives (8 '), whose axis of rotation runs parallel or transversely to the longitudinal axis of the rollers (3, 4). 11.) Device according to claim 1 and following, characterized in that the shear or working speed of the Work roll is at least 3 m / sec. 12.) Device according to claim 1 and following, characterized in that that the surface quality of the profiles the work roll and the counter roll is different. 2098 11 / QS19 ! AD ORIQlNAL Blank page