CA1187667A - Extruder mixer - Google Patents
Extruder mixerInfo
- Publication number
- CA1187667A CA1187667A CA000399168A CA399168A CA1187667A CA 1187667 A CA1187667 A CA 1187667A CA 000399168 A CA000399168 A CA 000399168A CA 399168 A CA399168 A CA 399168A CA 1187667 A CA1187667 A CA 1187667A
- Authority
- CA
- Canada
- Prior art keywords
- stator
- rotor
- rows
- cavities
- offset
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
ABSTRACT
An extruder mixer comprising a hollow cylindrical stator (14) having a cylindrical rotor (10) journalled therewithin, the facing cylindrical surfaces of the rotor and stator carrying respective pluralities of parallel circumferentially extending rows of hemi-spherical cavities (18,20). In order to achieve an exponential mixing characteristic in which simple shear mixing is repeatedly interrupted by cutting and turning stages, the rotor and stator cavities (18,20) are arranged such that (a) the cavities (20) in adjacent rows on the stator are circumferentially offset, (b) the cavities (18) in adjacent rows on the rotor are circumferentially offset, and (c) the rows of cavities (18,20) on the stator and rotor are axially offset.
An extruder mixer comprising a hollow cylindrical stator (14) having a cylindrical rotor (10) journalled therewithin, the facing cylindrical surfaces of the rotor and stator carrying respective pluralities of parallel circumferentially extending rows of hemi-spherical cavities (18,20). In order to achieve an exponential mixing characteristic in which simple shear mixing is repeatedly interrupted by cutting and turning stages, the rotor and stator cavities (18,20) are arranged such that (a) the cavities (20) in adjacent rows on the stator are circumferentially offset, (b) the cavities (18) in adjacent rows on the rotor are circumferentially offset, and (c) the rows of cavities (18,20) on the stator and rotor are axially offset.
Description
766~7 - 1 ~ .
DESCRIPTION :
~ 3~
The present inven-tion relates to extruder mixers for viscous fluids, such as molten plastics and rubbers, and is particularly concerned with extruder m.ixers of the cavity-trans~er type.
An example of a knot~n cavity-transfer type extruder mixer is that disclosed in British Patent Specification No. 930 33~ and includes a hollow cylindrical stator member and a cylindrical rotor member which is rota~able within the stator. The facing cylindrical surfaces on the rotor and stator carry respective pluralities o~ rows of :
elongate, longitudinally extending groo~es. The rows of grooves on each member extend peripherally around the member and are spaced apart axially, the rows on one member being axially offset from the rows on the other member whereby there is axial overlap of the grooves in adjacent rows on the stator and rotor. By virtue of this arrange-ment of overlapping closed cavities on -the rotor and stator, material progressing through this mixer has to travel in a path which alternates between rotor and . stator cavities. Where a cavity on one memb2r happens to he opposite a land on the other mem~er the material is subjected to simple shear so that it is cut in half before being displaced approximately at right angles to its original direction as it passes into the next cavity.
Another known machine of this ~ype is described in British Patent Specification No. 1 475 216.
It has ~een found that, whereas such mixers operate satisfactorily when constructed on a small, laboratory scale, when scaled up to a large production size machine the efticiency of the mixer falls, a size limitation being reached where either the product is unsuitable or the added length necessary makes engineering cornplexity uneconomic. T'nis is because the output r~te per screw revolution o-f an extruder increases in proportion to ~he ~.
cuoed power of the screw diatner.er whereas :he available ,~
. ~' ~.
" 1187667
DESCRIPTION :
~ 3~
The present inven-tion relates to extruder mixers for viscous fluids, such as molten plastics and rubbers, and is particularly concerned with extruder m.ixers of the cavity-trans~er type.
An example of a knot~n cavity-transfer type extruder mixer is that disclosed in British Patent Specification No. 930 33~ and includes a hollow cylindrical stator member and a cylindrical rotor member which is rota~able within the stator. The facing cylindrical surfaces on the rotor and stator carry respective pluralities o~ rows of :
elongate, longitudinally extending groo~es. The rows of grooves on each member extend peripherally around the member and are spaced apart axially, the rows on one member being axially offset from the rows on the other member whereby there is axial overlap of the grooves in adjacent rows on the stator and rotor. By virtue of this arrange-ment of overlapping closed cavities on -the rotor and stator, material progressing through this mixer has to travel in a path which alternates between rotor and . stator cavities. Where a cavity on one memb2r happens to he opposite a land on the other mem~er the material is subjected to simple shear so that it is cut in half before being displaced approximately at right angles to its original direction as it passes into the next cavity.
Another known machine of this ~ype is described in British Patent Specification No. 1 475 216.
It has ~een found that, whereas such mixers operate satisfactorily when constructed on a small, laboratory scale, when scaled up to a large production size machine the efticiency of the mixer falls, a size limitation being reached where either the product is unsuitable or the added length necessary makes engineering cornplexity uneconomic. T'nis is because the output r~te per screw revolution o-f an extruder increases in proportion to ~he ~.
cuoed power of the screw diatner.er whereas :he available ,~
. ~' ~.
" 1187667
- 2 - , mixer area increases by only the square of the screw diameter if the length to diameter ra-tio of the mixer is kept constant.
If one a-ttempts to increase the mixing capacity -by making the cavities deeper then, for example in the case of molten plastics, there is a risk of polymer stagnation and degradation occurring in the corners of the cavities.
It is an object of the present invention to provide an extruder mixer and mixing process which enable~ large scale operation whilst reducing ~he problems of the known mixers outlined a~ove.
In accordance with one aspect of the present ~'!' , invention this is achieved by arrang,ing the rotor and stator cavities in parallel rows on theirotor and stator such that ~i) the cavities in adjacent rows on the stator are circumferentially ofLset, (ii) the cavities in ~;~
a~jacent rows on the rotor are circumferentially offset and (iii) the ro~s of cavities Oll the stator and rotor are axially ofrset.
By this means, an overall increase in mixing capa~ity for the same surface area can be obtained whilst achieving a de,lred exponential mixing characteristic in which ~simple shear mixing is repeatedly interrupted by cutting and turning stages.
Preferably, in the case of both the s-tator and the rotor, the circumferential offset is equal to half the circumferential distance bet~een the centres oE adjacent cavities in a row.
The axial offset of the stator and rotor rows is preferably eyual to half the axial spacing between adjacent rotor or stator ro~s.
Pa.,ticularly when -the circumferential offse~
corresponds to half the centre spacing bet~/een adjacent
If one a-ttempts to increase the mixing capacity -by making the cavities deeper then, for example in the case of molten plastics, there is a risk of polymer stagnation and degradation occurring in the corners of the cavities.
It is an object of the present invention to provide an extruder mixer and mixing process which enable~ large scale operation whilst reducing ~he problems of the known mixers outlined a~ove.
In accordance with one aspect of the present ~'!' , invention this is achieved by arrang,ing the rotor and stator cavities in parallel rows on theirotor and stator such that ~i) the cavities in adjacent rows on the stator are circumferentially ofLset, (ii) the cavities in ~;~
a~jacent rows on the rotor are circumferentially offset and (iii) the ro~s of cavities Oll the stator and rotor are axially ofrset.
By this means, an overall increase in mixing capa~ity for the same surface area can be obtained whilst achieving a de,lred exponential mixing characteristic in which ~simple shear mixing is repeatedly interrupted by cutting and turning stages.
Preferably, in the case of both the s-tator and the rotor, the circumferential offset is equal to half the circumferential distance bet~een the centres oE adjacent cavities in a row.
The axial offset of the stator and rotor rows is preferably eyual to half the axial spacing between adjacent rotor or stator ro~s.
Pa.,ticularly when -the circumferential offse~
corresponds to half the centre spacing bet~/een adjacent
3~ cavities in a row and the axial offset is such that the -~
adjacen-t edges oE the cavlty mouths in each pair of , ~
.. ' .
adjacent rows on the stator or rotor lie on or adjacent the centre line of the cavities in a row on the rotor o~
s~ator respectively the cavities can be pack2d together so as to occupy about 60~ or more of the respective stator and rotor surfaces and so as to increase the nu~ber of transfer points between the rotor and stator compared with known mixers and hence achieve better mixing. ..The resulting staggered formation achieves better mixing by dividing the melt streams better transfer of material and hence higher output rate for the same pressure drop.
Preferably the rotor and stator cavities all have circular mouths.
In accordance with a second aspect of the present invention there is provided an extrusion mixing process in which two or more components are mixed by transfer between rows of cavities within both a hollow cylindrical stator and a cylirldrical rotor journalled therewithin an exponential ~ixing process being obtained by repeated cutting and turning operations on the mixture at the transfers between cavities on the opposed faces of the st.ator and rotor and by dividing the mixture flow between pairs of adjacent cavitles on the same rotor or stator face by means of a ~espective overlappin~ cavity on the opposite stator or rotor face.
In accordance with a third aspect of the present invention the rotor and stator cavities-are oE hemi- ¦
spherical configuration and are arranged in parallel rows on the roto~ and stator such -that (i) the cavities in adja~ent rows on the stator are circumferenti.ally offset (ii) the cavities in adjacent rows on the rotor are circumferentially offset and (iii) the ro-~rs of cavities on -the stator and rotor are axially offset.
The invention is descrlbed fu~ r hereinafterl by way of e.~a~ple with reference to the accompanying dra-.~ings in which:-Fig. l is a longi.tudinal sec~lon through an '~
` ' ~
' 76~ii7
adjacen-t edges oE the cavlty mouths in each pair of , ~
.. ' .
adjacent rows on the stator or rotor lie on or adjacent the centre line of the cavities in a row on the rotor o~
s~ator respectively the cavities can be pack2d together so as to occupy about 60~ or more of the respective stator and rotor surfaces and so as to increase the nu~ber of transfer points between the rotor and stator compared with known mixers and hence achieve better mixing. ..The resulting staggered formation achieves better mixing by dividing the melt streams better transfer of material and hence higher output rate for the same pressure drop.
Preferably the rotor and stator cavities all have circular mouths.
In accordance with a second aspect of the present invention there is provided an extrusion mixing process in which two or more components are mixed by transfer between rows of cavities within both a hollow cylindrical stator and a cylirldrical rotor journalled therewithin an exponential ~ixing process being obtained by repeated cutting and turning operations on the mixture at the transfers between cavities on the opposed faces of the st.ator and rotor and by dividing the mixture flow between pairs of adjacent cavitles on the same rotor or stator face by means of a ~espective overlappin~ cavity on the opposite stator or rotor face.
In accordance with a third aspect of the present invention the rotor and stator cavities-are oE hemi- ¦
spherical configuration and are arranged in parallel rows on the roto~ and stator such -that (i) the cavities in adja~ent rows on the stator are circumferenti.ally offset (ii) the cavities in adjacent rows on the rotor are circumferentially offset and (iii) the ro-~rs of cavities on -the stator and rotor are axially offset.
The invention is descrlbed fu~ r hereinafterl by way of e.~a~ple with reference to the accompanying dra-.~ings in which:-Fig. l is a longi.tudinal sec~lon through an '~
` ' ~
' 76~ii7
- 4 assembled mixer in accordance with the present invention;
~ig. 2 is a transverse section thro~gh the rotor alone, taken along the line II-II in Fig. l; .
Fi~. 3 is a transverse section through the stator alone taken along the line III-III in Fig. l;
Fig. 4 is a developed view of part o-f the rotor and stator illustrating the axial offset of the rows of hemispherical depressions in the rotor and stator, and Fig. 5 is an experimental graph illustrating the improved mixing characteristic of a mixer in accordance with the present invention compared with a.known mixer.
The illustrated mixer includes a rotor 10 which is rota-tably mounted within a basically cylindrical bore 12 in a sta-tor 14. The right--hand end of the rotor 10, as viewed in Fig. 1, is adapted to be keyed to the output end of a screw conveyor (not shown) and the left- -hand end of the stator 14 is adapted to be attached to an extrusion die (not shown) whereby material being processed, e.g. polymer is forced between the rotor and stator in passing from the scre~ conveyor to the extrusion die. The arrangement described so far is conventional.
As shown in the drawings, the facing surfaces 16 and 12 on the rotor and stator are -formed with respective pluralities o~ hemispherical cavities 18,20.
The cavities 18 on the rotor are disposed in a plurality of circumferentially extending rows. As indicated in Fiy. 2, Fig. 3 and Fig. 4, adJacent rows on the rotor are circumferentially displaced such that the centre of each cavity in a given row lies mi.dway between the centrss of the two nearsst cavities in the or each adjacent row. This can best be seen from the developed v.iew of Fig. 4 wherQ, for example, the circles 18a, 18b, 18c represent -the cav:ities ln one row on -the rotor and the circles 18a', 18b', 18c' and 18a", 18b", 18c"
represent the cavities i.n the adjacent rotor ro~s. It will ba note~ that the c.ircle :i~letltlfied as 18b is offset ~1 3'7667 -- 5 ~
in the circumferential direction from -the adjacent circles 18a', 18b', 18a" and 18b" by half the ~istance between the centres of any two adjacent cavities in a row, e.g.
between the centres of the cavities 18a and 18b.
S In a similar manner, the cavities 20 on the stator are disposed in a plurality of circumEerentially extending rows, adjacent rows on the stator again being circumEerentially displaced such that the cavities in a given row are offset by half the distance between the 10 centres of any two adjacent cavities in a row.
In addition to the above-described offset nature of the adjacent rows of cavities on the rotor and stator, the relative axial positions of the rows on the rotor and s~ator are also offset as best seen in Fig. 4, such lS that the circumferential line ~oining the centre of any given ro~ of cavities on the s,ator lies in the same axial position as a circumferential line positioned midway between the two circumferential lines joining the cen-tres of the cavities in the two adjacent rotor rows. 3 20 Thus, for example, in Fig. 4 the centres of the stator cavities 20a, 20b lie on a circumferent:ial line posi-tioned midway between the circumferential line ~oining -the centres of rotor cavities 18a", 18b", 18c" and the circumEerential line joining the centres of thf~ rotor 25 cavities 18a, 18b, 18c.
This arrangement re~sul-ts in several practical advan-tages comparec~ with the originally described known ~, arrangements. The mixing capacity for the same surface area is considerably increased compared with the initially 30 described arrangements. The configuration of the hemispherical cavities can be arranged so that overlap3 occur hetween three cavities at any given time so that extra mixing or blerlding is obtained by repea-ted division of the melt streams. The hemlspherical shape gives 35 excellent s-tre~amlining so that, for example, polymer stagnation ~ill not occur and purging is efficien-t when polymer changes are made. Th~ hemispherical cavities ~ .
. . ' ~
. . ~
~:~l8766'7 can he cut with a ball end milling cutter which makes ¦machining comparativel.y simple. Polishing is also easy so that overall manufacturing CQStS are reducec3. .
Removal o$ polymer from hemispherical ca~ities is comparatively easy, which reduces cleaning time ol the mixer and therefore "downt.ime" in production situations. 1.
In an experimental comparison of a mixer as ¦
described above and a mixer of the known type described initially, striatio~ thickness measurements o~ flexible PVC samples removed fro~ the ejected s.ta~or o~ the presen~ mixer following black striation injection befors the mixer ~ave a gxaph ~Fig. 5) of log striation thickness ratio versus mixer s~ag~ which had a steeper gradient ~curve A~ than when the same`test was repea~ed 15with the kno~m mixer (curve B), i.e~ mixing was improved il in the present mixer.
~ lthough illus-trated as being purely hemispherical, I
the rotor and stator cavities can also be in the form of ¦.
cylinders, or of radiussed cylinders, i~e. a cylindrical 20 - ca~ity hav.ing radiussed closed end, and cylinder and hemispheres, i.e. a cylindrical cavity having a !
hemispherical closed end. The cylindrical arrangement is ¦ j not favoured, however, as it can give rise to dead spo-ts ~here unmixed material can lodge. Other cavity ¦ I
~5 con~igurations, such as diamond-shaped, are possible but ¦
it is pre:Eerred for the cavities to have circular mouths.
Whereas the aforegoing description has been ~, I
concerned particularly with the mixing of molten plas-tics ~ . j and ruh~ers, the present mixer and process is also useful i for mixing operations on other viscous fluids, such as soaps, dough~, clays and margarines. ¦
Furthermore, -the above-described mixer has useful applications in injection moulding systems for m.ixing, at a posit.ion upstream of an lnject.ion die or dies, components which are to be :injection.moulded~
.
~.
~ig. 2 is a transverse section thro~gh the rotor alone, taken along the line II-II in Fig. l; .
Fi~. 3 is a transverse section through the stator alone taken along the line III-III in Fig. l;
Fig. 4 is a developed view of part o-f the rotor and stator illustrating the axial offset of the rows of hemispherical depressions in the rotor and stator, and Fig. 5 is an experimental graph illustrating the improved mixing characteristic of a mixer in accordance with the present invention compared with a.known mixer.
The illustrated mixer includes a rotor 10 which is rota-tably mounted within a basically cylindrical bore 12 in a sta-tor 14. The right--hand end of the rotor 10, as viewed in Fig. 1, is adapted to be keyed to the output end of a screw conveyor (not shown) and the left- -hand end of the stator 14 is adapted to be attached to an extrusion die (not shown) whereby material being processed, e.g. polymer is forced between the rotor and stator in passing from the scre~ conveyor to the extrusion die. The arrangement described so far is conventional.
As shown in the drawings, the facing surfaces 16 and 12 on the rotor and stator are -formed with respective pluralities o~ hemispherical cavities 18,20.
The cavities 18 on the rotor are disposed in a plurality of circumferentially extending rows. As indicated in Fiy. 2, Fig. 3 and Fig. 4, adJacent rows on the rotor are circumferentially displaced such that the centre of each cavity in a given row lies mi.dway between the centrss of the two nearsst cavities in the or each adjacent row. This can best be seen from the developed v.iew of Fig. 4 wherQ, for example, the circles 18a, 18b, 18c represent -the cav:ities ln one row on -the rotor and the circles 18a', 18b', 18c' and 18a", 18b", 18c"
represent the cavities i.n the adjacent rotor ro~s. It will ba note~ that the c.ircle :i~letltlfied as 18b is offset ~1 3'7667 -- 5 ~
in the circumferential direction from -the adjacent circles 18a', 18b', 18a" and 18b" by half the ~istance between the centres of any two adjacent cavities in a row, e.g.
between the centres of the cavities 18a and 18b.
S In a similar manner, the cavities 20 on the stator are disposed in a plurality of circumEerentially extending rows, adjacent rows on the stator again being circumEerentially displaced such that the cavities in a given row are offset by half the distance between the 10 centres of any two adjacent cavities in a row.
In addition to the above-described offset nature of the adjacent rows of cavities on the rotor and stator, the relative axial positions of the rows on the rotor and s~ator are also offset as best seen in Fig. 4, such lS that the circumferential line ~oining the centre of any given ro~ of cavities on the s,ator lies in the same axial position as a circumferential line positioned midway between the two circumferential lines joining the cen-tres of the cavities in the two adjacent rotor rows. 3 20 Thus, for example, in Fig. 4 the centres of the stator cavities 20a, 20b lie on a circumferent:ial line posi-tioned midway between the circumferential line ~oining -the centres of rotor cavities 18a", 18b", 18c" and the circumEerential line joining the centres of thf~ rotor 25 cavities 18a, 18b, 18c.
This arrangement re~sul-ts in several practical advan-tages comparec~ with the originally described known ~, arrangements. The mixing capacity for the same surface area is considerably increased compared with the initially 30 described arrangements. The configuration of the hemispherical cavities can be arranged so that overlap3 occur hetween three cavities at any given time so that extra mixing or blerlding is obtained by repea-ted division of the melt streams. The hemlspherical shape gives 35 excellent s-tre~amlining so that, for example, polymer stagnation ~ill not occur and purging is efficien-t when polymer changes are made. Th~ hemispherical cavities ~ .
. . ' ~
. . ~
~:~l8766'7 can he cut with a ball end milling cutter which makes ¦machining comparativel.y simple. Polishing is also easy so that overall manufacturing CQStS are reducec3. .
Removal o$ polymer from hemispherical ca~ities is comparatively easy, which reduces cleaning time ol the mixer and therefore "downt.ime" in production situations. 1.
In an experimental comparison of a mixer as ¦
described above and a mixer of the known type described initially, striatio~ thickness measurements o~ flexible PVC samples removed fro~ the ejected s.ta~or o~ the presen~ mixer following black striation injection befors the mixer ~ave a gxaph ~Fig. 5) of log striation thickness ratio versus mixer s~ag~ which had a steeper gradient ~curve A~ than when the same`test was repea~ed 15with the kno~m mixer (curve B), i.e~ mixing was improved il in the present mixer.
~ lthough illus-trated as being purely hemispherical, I
the rotor and stator cavities can also be in the form of ¦.
cylinders, or of radiussed cylinders, i~e. a cylindrical 20 - ca~ity hav.ing radiussed closed end, and cylinder and hemispheres, i.e. a cylindrical cavity having a !
hemispherical closed end. The cylindrical arrangement is ¦ j not favoured, however, as it can give rise to dead spo-ts ~here unmixed material can lodge. Other cavity ¦ I
~5 con~igurations, such as diamond-shaped, are possible but ¦
it is pre:Eerred for the cavities to have circular mouths.
Whereas the aforegoing description has been ~, I
concerned particularly with the mixing of molten plas-tics ~ . j and ruh~ers, the present mixer and process is also useful i for mixing operations on other viscous fluids, such as soaps, dough~, clays and margarines. ¦
Furthermore, -the above-described mixer has useful applications in injection moulding systems for m.ixing, at a posit.ion upstream of an lnject.ion die or dies, components which are to be :injection.moulded~
.
~.
Claims (8)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In an extruder mixer of the type comprising a hollow cylindrical stator member and a cylindrical rotor member which is rotatable within the stator and wherein the facing cylindrical surfaces of the rotor and stator carry respective pluralities of rows of recesses, with the rows on each member extending peripheral-ly around the member and being spaced apart axially so that the rows on one member are axially offset from the rows on the other member whereby there is axial overlap of the recesses in adjacent rows on the stator and rotor, the improvement wherein the rotor and stator recesses are in the form of hemispherical cavities, the hemispherical cavities being disposed with:
(1) the cavities in adjacent rows on the stator circum-ferentially offset, (2) the cavities in adjacent rows on the rotor circum-ferentially offset, and (3) the rows of cavities on the stator and rotor axially offset.
(1) the cavities in adjacent rows on the stator circum-ferentially offset, (2) the cavities in adjacent rows on the rotor circum-ferentially offset, and (3) the rows of cavities on the stator and rotor axially offset.
2. An extruder mixer comprising a hollow cylindrical stator member, a cylindrical rotor member, means journalling the rotor for rotation within the stator, the facing cylindrical surfaces of the rotor and stator carrying respective pluralities of parallel rows of hemispherical cavities, the hemispherical cavities being disposed with:
(1) the cavities in adjacent rows on the stator circum-ferentially offset, (2) the cavities in adjacent rows on the rotor circum-ferentially offset, and (3) the rows of cavities on the stator and rotor axially offset.
(1) the cavities in adjacent rows on the stator circum-ferentially offset, (2) the cavities in adjacent rows on the rotor circum-ferentially offset, and (3) the rows of cavities on the stator and rotor axially offset.
3. An extruder mixer according to claim 2 wherein in the case of both the stator and the rotor, the circumferential offset between the cavities in adjacent rows is equal to half the circum-ferential distance between the centres of adjacent cavities in a row.
4. An extruder mixer according to claim 3 wherein the axial offset of the stator and rotor rows is equal to half the axial spacing between adjacent rotor rows.
5. An extruder mixer comprising a hollow cylindrical stator member, a cylindrical rotor member, means journalling the rotor for rotation within the stator, the facing cylindrical surfaces of the rotor and stator carrying respective pluralities of parallel rows of hemispherical cavities, the rows of hemispherical cavities on the rotor and stator being axially offset and the hemispherical cavities in each pair of adjacent rows on both the rotor and stator being circumferentially offset.
6. An extruder mixer according to claim 5 wherein the circumferential offset corresponds to half the centre spacing between adjacent cavities in a row and the axial offset is such that the adjacent edges of the cavity mouths in each pair of adjacent rows on the stator/rotor lie on the centre line of the cavities in a row on the rotor/stator, respectively.
7. In an extruder mixer of the type comprising a hollow cylindrical stator member and a cylindrical rotor member which is rotatable within the stator, and wherein the facing cylindrical surfaces of the rotor and stator carry respective pluralities of rows of recesses, with the rows on each member extending peripher-ally around the member and being spaced apart axially so that the rows on one member are axially offset from the rows on the other member whereby there is axial overlap of the recesses in adjacent rows on the stator and rotor, the improvement wherein the rotor and stator recesses have circular mouths, the recesses being dis-posed with:
(1) the recesses in adjacent rows on the stator circum-ferentially offset, (2) the recesses in adjacent rows on the rotor circum-ferentially offset, and (3) the rows of recesses on the stator and rotor axially offset.
(1) the recesses in adjacent rows on the stator circum-ferentially offset, (2) the recesses in adjacent rows on the rotor circum-ferentially offset, and (3) the rows of recesses on the stator and rotor axially offset.
8. An extrusion mixing process in which two or more compon-ents are mixed by transfer between rows of cavities within both a hollow cylindrical stator and a cylindrical rotor journalled there-within, characterised in that an exponential mixing process is obtained by repeated cutting and turning operations on the mixture at the transfers between cavities on the opposed faces of the stator and rotor and by dividing the mixture flow between pairs of adjacent cavities on the same rotor or stator face by means of a respective overlapping cavity on the opposite stator or rotor face.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000399168A CA1187667A (en) | 1982-03-23 | 1982-03-23 | Extruder mixer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000399168A CA1187667A (en) | 1982-03-23 | 1982-03-23 | Extruder mixer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1187667A true CA1187667A (en) | 1985-05-28 |
Family
ID=4122374
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000399168A Expired CA1187667A (en) | 1982-03-23 | 1982-03-23 | Extruder mixer |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1187667A (en) |
-
1982
- 1982-03-23 CA CA000399168A patent/CA1187667A/en not_active Expired
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| MKEX | Expiry |