with reference to fig1 there is shown a compact processor 20 for plastic materials and comprising a unitized mixing and extrusion system that allows a user to customize mixing and extrusion of plastic materials being processed . this unitized processor system comprises a two - rotor , continuous mixer 22 mounted on an upper level 23 of a framework 24 . plastic materials , fillers , additives , colorants , and the like , as desired by the user , namely various ingredients desired to be mixed with plastic materials , are introduced into a feed entrance ( sometimes called a “ feed throat ”) of the continuous mixer 22 , as indicated by an arrow 26 . the resulting molten plastic materials flow by gravity down from the continuous mixer 22 like a molten “ rope ”, descending within a vertical chute 28 , into a hot - feed extruder 30 . the output from the extruder 30 issues through an extruder head 32 adapted to have various types of an extrusion device 33 mounted thereon , as may be desired by the user . for driving the two rotors in the mixer 22 , there is shown a suitable drive system 34 , for example , such as a d . c . drive motor 35 arranged with suitable feedback speed and torque controls , as known in the art , for turning the mixer rotors preferably at predetermined constant speed . this motor 35 is coupled to a suitable speed - reducer 36 , for example such as an all helical gear , speed - reducer with two output shafts coupled to two three - piece rotors for rotating the two rotors in opposite directions about their respective longitudinal axes . in this illustrative example , the two rotors are turned in opposite directions at the even / or ratio rates . the mixer 22 includes a drive end frame 38 ( also called a “ drive bearing housing assembly ”) for rotatably supporting a drive end journal ( not seen in fig1 ). this drive end frame 38 and its journal will be described in detail later . the mixer includes a driven end frame 39 “ which may be called the “ water end frame ” and also may be called “ driven bearing housing assembly ”) for rotatably supporting a driven end journal ( not seen in fig1 ). the driven end , frame 39 , and its journal , also will be described in detail later . mounted between drive and driven end frames 38 , 39 is a mixer chamber barrel , or housing 40 , including an upper half 41 and a lower half 42 . for driving an extruder feed screw 44 ( fig1 ) in the hot - fed extruder 30 , there is shown an electric motor 46 mounted on a base 48 of framework 24 . this motor 46 is coupled through a suitable speed - reducer transmission 50 to the extruder screw 44 . looking to top plan view of fig2 with upper barrel half 41 removed , there is shown a pair of parallel rotors , 60 l / r , both positioned horizontally within housing 40 , and which are denominated left and right hand mixing rotors , respectively . the left - hand , longitudinal ends of the mixing rotors are mounted conventionally in journals at the drive end , frame 38 , while the drive ends each have a packing seal assembly , generally 52 l / r , respectively , to be described , in connection with fig4 et seq . the other longitudinal ends of the paired rotors are mounted in driven ends of the housing frames , 39 l / r ( fig1 ). reference will now be made to fig3 to describe a state of the prior art device regarding drive end , packing seal assemblies , employable in connection with the compact processor for plastic materials , schematically seen in fig1 & amp ; 2 . axially mounted to the drive end 38 of right hand , helical rotor 60 r is the drive end , packing seal assembly , generally 52 r . it comprises : an inner , collar - like . wear sleeve 66 ; an l - shaped , packing seal retainer 68 ; a bushing - like , packing housing 70 ; and an alignment ring 72 , which separates three rope - like , packing components , 74 a , 74 b , and 74 c ; the subassembly 78 at the free outer end comprises rotor plate 80 ; and associated bolts and washers , 76 a , b , c which clamp that describes parts in a working relation ; the horizontal flanged element 68 f of seal retainer 68 is biased inwardly , via its lock nut 82 against the set of rope packings 74 . these serve to expand same radially against the circular periphery of wear sleeve 66 . experience has shown that the particulate material , while in process , infiltrates into the just - described sealing arrangement , thereby hardening this packing set , generally 74 a / 74 b . this progresses to the extent that they will not properly seal against wear sleeve 66 . this time developing defect causes feed particulate to leak about the wearing sleeve 66 periphery . when the leakage contamination levels reach appreciable levels , the mixer must be shut down , and all the just - described packing seal elements are disassembled , so as to permit replacement of the three rope packing rings , the intermediate alignment ring and the wear sleeve . looking now to the vertical sectional view of fig4 a structurally modified and improved visco sealing assembly of the present invention is depicted . several of the components are continued modified , such as the rotor plate 80 a , and the seal retainer 68 a , but the alignment ring 72 is now omitted . the sleeve assembly 70 a , the wear sleeve 66 a , and the packing component 88 a themselves , are significantly reconfigured for superior visco sealing . sleeve assembly 70 a is now provided along its inner circumferential surface with an integral , continuous peripheral ridge 90 , which ridge is located quite proximal to the longitudinal end , of sleeve assembly sidewall 86 s , and is distal from the adjoining right hand , rotor 60 r / l flanged end 89 . a second circular , axially projecting ridge 94 is provided upon the sleeve assembly sidewall 86 s , and is contiguous ( conjoined ) with the inner peripheral ridge 90 thereof . an annular chamber 96 of squared cross section , is defined by bushing - like , sleeve assembly 70 a ; ridge 94 ; ridge 90 , wear sleeve 66 a , and packing seal retainer 68 a . these elements provide the functional recess for a single rope packing component , 88 a . offset , but linearly aligned with chamber 96 , is the annular chamber 87 a of an elongate rectangular cross section defined by the opposing circumferential periphery of sleeve assembly 70 a and drive end visco seal wear sleeve 66 a . this annulus - shaped recess 87 a accommodates the metal liner 102 of the present invention , which liner demonstrates prolonged effectiveness during mixing and extrusion . the novel heat resistant , liner 102 of the present invention is preferably composed of bronze . the side and end elevational view of fig5 a / b , depict the dimensions of the somewhat modified bushing - like , sleeve assembly 70 a with sleeve 102 in place ; while the side and end elevation views of fig6 a / b depict the right hand , visco wear sleeve seal 66 a . note that the inwardly oriented , circular ridge 90 on bushing 70 a provides lateral support to the inward edge of sleeve liner 102 . the sleeve seal 66 a has a peripherally threaded segment ( 66 t ) proximal to the one longitudinal end . this latter sleeve component is known in the art as a standard element for visco seals , which was described in expired u . s . pat . no . 3 , 963 , 247 , of jun . 15 , 1976 to nommensen . in the end elevational view and side elevational view of fig7 a and 7b , the circular , ring - like , configuration resilient of packing 88 a is depicted . looking now to the exploded perspective view of fig8 which depicts all of the operative components aligned pre - assembly , opposing lower edge , 103 , of seal retainer 68 a , has a set screw 104 , which screw serves to retain packing 88 a in abutting relationship with inward oriented , circular ridge 90 of sleeve assembly 70 a with grease fitting 71 a . two diametrically opposed , squared notches , 106 l / r , are provided in the circular rim 106 of drive end visco sleeve 66 a which extends outwardly of the one longitudinal end . these serve to key the alignment of the sealing component within the drive end subassembly 52 l ( right hand rotor shown ) of fig2 . selected spaced - apart sealing elements , to wit , l - shaped seal retainer 68 a , bushing - like sleeve assembly 70 a , dual circumference , visco seal 66 a , and rope packing 88 a , comprise the modified elements of the drive end , improved visco seal means of the present invention .