CA1307635C - Pellet production apparatus - Google Patents
Pellet production apparatusInfo
- Publication number
- CA1307635C CA1307635C CA000596757A CA596757A CA1307635C CA 1307635 C CA1307635 C CA 1307635C CA 000596757 A CA000596757 A CA 000596757A CA 596757 A CA596757 A CA 596757A CA 1307635 C CA1307635 C CA 1307635C
- Authority
- CA
- Canada
- Prior art keywords
- rotor
- grooves
- extruder
- sheath
- pellet production
- 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 - Lifetime
Links
- 239000008188 pellet Substances 0.000 title claims abstract description 50
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 22
- 238000001125 extrusion Methods 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims 1
- 239000010935 stainless steel Substances 0.000 claims 1
- 229910001220 stainless steel Inorganic materials 0.000 claims 1
- 229910052719 titanium Inorganic materials 0.000 claims 1
- 239000010936 titanium Substances 0.000 claims 1
- 229920003023 plastic Polymers 0.000 abstract description 2
- 239000004033 plastic Substances 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Landscapes
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
Abstract of the Disclosure A pellet production apparatus to be incorporated with an excluder for mass-producing pellets of plastics or the like.
The apparatus comprising a multi-perforated hollow cylindrical sheath acting as nozzles and a cylindrical rotor provided on its cylindrical surface with some lengthwise tapered-grooves and corresponding lengthwise ridge portions. The ridge portions act as cutters with the rotor rotatably inserted in the above sheath. The rotor is further provided with an air blow means for making compressed-air blow radially and rotated by a driving means exclusive to the rotor. A pellet material extruded from the extruder into the present apparatus is made to proceed along the grooves of the rotor, pushed out from the perforations of the sheath and then cut out into pellets by the ridge portions of the rotor as it rotates further. The thus produced pellets, which are apt to stick to the perforations, are blown off by the compressed air.
The apparatus comprising a multi-perforated hollow cylindrical sheath acting as nozzles and a cylindrical rotor provided on its cylindrical surface with some lengthwise tapered-grooves and corresponding lengthwise ridge portions. The ridge portions act as cutters with the rotor rotatably inserted in the above sheath. The rotor is further provided with an air blow means for making compressed-air blow radially and rotated by a driving means exclusive to the rotor. A pellet material extruded from the extruder into the present apparatus is made to proceed along the grooves of the rotor, pushed out from the perforations of the sheath and then cut out into pellets by the ridge portions of the rotor as it rotates further. The thus produced pellets, which are apt to stick to the perforations, are blown off by the compressed air.
Description
1 3n763~
PELLET PRODUCTION APPARATUS
~ackground of the Invention The present invention relates to an apparatus for producing pellets of plastic, rubber, ceramic, a composite of them or the like.
The inventor of the present invention has disclosed two kinds of pellet production apparatus in Japanese Patent Publication Nos. 55-1166 and 56-12490, published January 12, 1980 and March 23, 1981, respectively.
The apparatus disclosed in the Publication No. 55-1166 is basically made up of a combination of an ordinary screw type extruder wlth a specifically designed pellet forrning device.
The pellet forming device is composed of a stationary cylindrical sheath member formed by a hollow cylinder having on its cylindrical surface many orifices as nozzles and of a grooved cylindrical rotor formed by a cylinder having on its cylindrical surface some lengthwise grooves and corresponding lengthwise ridge portions. The grooved cylindrical rotor, being inset in the stationary cylindrical sheath member, is slzed so that the lengthwise ridge portions may rotatably be fi-tted to the inner surface of the stationary cylindrical sheath member. The thus constituted pellet forming device is attached to the extruding end of a screw type extruder with said stationary sheath member fixed to the body of the extruder and with said grooved rotor coaxially connected with the screw part of the extruder. In such an entire constitution of the '~ ~ /;s, ~, , ....... . .
apparatus, a pellet material extruded into the pellet forming device from the extruder is pushed out from the orifices of the sheath member through the grooves ofthe rotor, and then cut off by the ridge portions of the rotor as it rotates together with the screw of the extruder. Thus, many pellets can be produced at a time and continually.
However, this apparatus has proved to have a disadvantage that the length of produced pellets is not determined only by the mechanical structure of the pellet forming device, but largely influenced by the inner pressure and screw rotation speed of the extruder or the viscosity of the material.
; The apparatus, which is disclosed in another Publication No. 56--124~0, is an extruder whose extrusion end comprises many e~trusion nozzles and a cutter or cutters. ~ccordin~ to this apparatus, a plurality of continuously extruded cord~ e pellet materials are cut into pellets by the cutter or cutters.
A decisive disadvantage of this apparatus is that the productivity is low owing to the use of a cutter or cutters, especially in producing such small pellets as are, for example, l.S mm in diameter and 2 mm in len~th. Application of this apparatus is limited because of a recently increasing demand for such small-sized pellets.
Objects and Summary of the Invention The present invention is made in order to eliminate the above-mentioned disadvantages accompanying conventional pellet production apparatus, and makes i-t an object to provide an improved pellet production apparatus capable of mass-producing pellets of desired size without being influenced by the screw rotation speed of an extruder which feeds pellet material to the pellet production apparatus.
Another object of the present invention is to add to such an improved pellet production apparatus a function to operate free also from both the viscosity of the pellet material and the inner pressure of the material feeding extruder.
To achieve the above objects, an apparatus according to the present invention consists basically of a stationary hollow cylindrical sheath having a large number of orifices as nozzles and of a cylindrical rotor having lengthwise surface grooves, a coaxially bored compressed-air introducing path, a plurality of radially directed air blow holes provided at ridge portions formed as a result of the provision of the above lengthwise surface grooves and a driving mechanism for rotating the c~lindrical rotor, the above radially directed air blow holes communicating with the above coaxially bored compressed-air introducing path. With the thus constituted pellet production apparatus attached to the materlal extrusion end of an extruder with the cylindrical rotor kept coaxial with the screw~of the extruder, a pellet material pushed into the pellet production apparatus from the extruder i5 transferred along the grooves of the rotor, pushed out from the orifices provided on the sheath, cut out to form pellets by the edges of the above - ^ 1 307635 mentioned ridge portions as the rotor rotates. The thus formed pellets are blown out by the compressed air supplied through the radially directed air blow holes.
According to the present invention, because the rotor is not connected to the screw of a material feeding extruder, but driven by a separate driving mechanism independently of the rotation of the screw of the extruder, the rotation speed of the rotor can be independently controlled so as to produce pellets of a desired length, irrespective of a pellet material feeding speed that depends on the inner pressure and screw rotation speed of the extruder and on the viscosity of the material.
srief Description of the Drawings In the following, the present invention is described in further detail in reference to the accompanying drawings, in which:
Fig. 1 shows lengthwise cross-sectionally an embodiment of the present invention as applied to an extruder;
Fig. 2 shows the cross-sectional view taken along line A-A of Fig. l;
Fig. 3 illustrates the function of the present invention; and Fig. 4 shows a lengthwise cross-sectional view of ~:
~ another embodiment of tha present invention.
:
~;,,~ :
~ .
` 1 307635 Detailed Description of the Invention Referring to Fig. 1, which shows a cross-sectional view of an embodiment of the invention as applied to an extruder, a mantle cylinder 1 and a screw 2 represent the extrusion end portion of the extruder to which the present embodiment is applied, while the pellet production apparatus according to the invention consists fundamentally of a multi-perforated hollow cylinder 3, a cylindrical rotor 5 provided with tapered grooves 7 etc. and a rotor driving mechanism comprising two bearings 10, 11, a pair of gears 12, 13, a motor 4 and a shaft connector 14 through which a rotor driving force is transmitted to the gear 13 from the motor 4.
In such a fundamental constitution, the multi-perforated hollow cylinder 3 has its cylindrical wall provided with a large number of orifices 3a acting as nozzles, and has its one end fixed to the flange 9 at the outlet of the extruder mantle cylinder 1. The other end of the multi-perforated hollow cylinder 3 is held by a pair of ring members 18 and 19.
The ring member 18 is fixed through a support (not shown) to a machine base (not shown) or the ground, while the ring member 19 is provided with a groove l9a and a material leakage discharge hole 19b. On the other hand, the cylindrical rotor 5, in which is bored along its axis a compressed--air introducing path 6, has its one end portion directed toward the extruder screw 2, inserted in the multi-perforated sheath 3 and provided with first grooves 7, second grooves 8 and radially t'^~
. . .
.
::
directed air-blow through holes 17 communicating between the second groove 8 and the compressed-air introducing path 6. The first grooves 7 are tapered so as to be made deeper toward the extruder with the groove ends made open thereto to accept a pellet material and so as to be made shallower in the opposite direction, vanishing at the position corresponding to the outside end where the multi-perforated hollow sheath 3 is held by the ring members 18 and 19. The second grooves 8 are made flat and shallow with their end not made open to the extruder.
The first grooves 7 and the second grooves 8 are disposed alternately on the periphery of the cylindrical rotor 5. At the open end of the compressed-air introducing path 6 there are inserted, with slidably air-tight seals 16 interposed, a compressed-air pipe 15 bridging the path 6 and a compressed-air source (not shown). Further, the cross-section of the first grooves 7 is not symmetrical, as is shown in Fig. 2 which shows the cross-sectional view taken along line A-A of Fig. 1.
Referring to Fig. 2, the curvature of curves profiling the cross-section of grooves 7 is made larger in the rotating direction (indicated by a curved dart) of the rotor 5, as is shown by reference signs 7a and 7b. According to such cross-sectional profiles of the grooves 7, the pellet material existing at smaller curvature regions 7b is pressed over a wide range toward the multi-perforated sheath 3 in the process of the rotation of the rotor 5.
With the apparatus constituted as described above, a ..:
" " . , pellet material extruded from the extruder is pushed into the first grooves 7 and then pushed out from the orifices 3a of the multi-perforated sheath 3. The material pushed out from the orifices 3a is cut out to form pellets, as the rotor 5 rotates, by the ridge portions formed between the first and the second grooves 7 and 8. The pellets, which may stick in the orifices 3a just after formed, are blown out by the compressed air supplied through the air-blow through holes 17, as is illustrated by Fig. 3 which shows an enlarged partlal cross-sectional view of the present apparatus. In the above process of pellet production, a small amount of pellet material that failed to be pushed out from the orifice 3a of the sheath 3 leaks into the groove l9a of the ring member 19 through a thin clearance undesirably left between the inner periphery of the sheath end portion and the outer periphery of the rotor 5, and then discharged out through the material leakage discharge hole l9b.
According to the present invention, as is easily understood from the above description, the length of produced pellets can be determined at will by controlling the rotation speed of the rotor 5 in accordance with the viscosity of the material, the inner pressure and screw rotation speed of the extruder.
Incidentally, the mu1tl-perforated hollow cylindrical sheath 3 is preferably made of a material having a high tensile strength, such as a tainie~s steel and a titarium based alloy.
.~
, Further, the first grooves ~ may be made not only tapered but also screw-shaped. In this case the second grooves 8, which are not tapered, are also made screw-shaped in accordance with the screw shape of the first grooves 7.
Fig. 4 shows another embodiment modified so as to be suitable to be applied to a biaxial or two-screw extruder.
In this embodiment the rotor 5 has its end portion prolonged so as to be inserted between two screws 21 and 22 of the extruder, and grooves 71 (which correspond to the grooves 7 in the preceding embodiment) are made not straight but screw-shaped to make it easy to take in a pellet material.
The present invention can be embodied also by making both the multi-perforated sheath and the rotor slightly tapered so as to be smaller in diameter toward the extruder at a tapering ratio of 1/100 to 2/100. In such an embodiment, the wear of the sheath and the rotor can be lessened by adjusting the relative posltion between both the elements along the common axis with a suitable adusting mechanism added to the apparatus.
Further, in case the close fitting between the multi-perforated sheath and the rotor ~ay be spoiled because the sheath is made to bulge by a high feeding pressure of the pellet materlal, the sheath may be finished so that its unaffected inner diameter may be somewhat larger than the outer diameter of the rotor.
PELLET PRODUCTION APPARATUS
~ackground of the Invention The present invention relates to an apparatus for producing pellets of plastic, rubber, ceramic, a composite of them or the like.
The inventor of the present invention has disclosed two kinds of pellet production apparatus in Japanese Patent Publication Nos. 55-1166 and 56-12490, published January 12, 1980 and March 23, 1981, respectively.
The apparatus disclosed in the Publication No. 55-1166 is basically made up of a combination of an ordinary screw type extruder wlth a specifically designed pellet forrning device.
The pellet forming device is composed of a stationary cylindrical sheath member formed by a hollow cylinder having on its cylindrical surface many orifices as nozzles and of a grooved cylindrical rotor formed by a cylinder having on its cylindrical surface some lengthwise grooves and corresponding lengthwise ridge portions. The grooved cylindrical rotor, being inset in the stationary cylindrical sheath member, is slzed so that the lengthwise ridge portions may rotatably be fi-tted to the inner surface of the stationary cylindrical sheath member. The thus constituted pellet forming device is attached to the extruding end of a screw type extruder with said stationary sheath member fixed to the body of the extruder and with said grooved rotor coaxially connected with the screw part of the extruder. In such an entire constitution of the '~ ~ /;s, ~, , ....... . .
apparatus, a pellet material extruded into the pellet forming device from the extruder is pushed out from the orifices of the sheath member through the grooves ofthe rotor, and then cut off by the ridge portions of the rotor as it rotates together with the screw of the extruder. Thus, many pellets can be produced at a time and continually.
However, this apparatus has proved to have a disadvantage that the length of produced pellets is not determined only by the mechanical structure of the pellet forming device, but largely influenced by the inner pressure and screw rotation speed of the extruder or the viscosity of the material.
; The apparatus, which is disclosed in another Publication No. 56--124~0, is an extruder whose extrusion end comprises many e~trusion nozzles and a cutter or cutters. ~ccordin~ to this apparatus, a plurality of continuously extruded cord~ e pellet materials are cut into pellets by the cutter or cutters.
A decisive disadvantage of this apparatus is that the productivity is low owing to the use of a cutter or cutters, especially in producing such small pellets as are, for example, l.S mm in diameter and 2 mm in len~th. Application of this apparatus is limited because of a recently increasing demand for such small-sized pellets.
Objects and Summary of the Invention The present invention is made in order to eliminate the above-mentioned disadvantages accompanying conventional pellet production apparatus, and makes i-t an object to provide an improved pellet production apparatus capable of mass-producing pellets of desired size without being influenced by the screw rotation speed of an extruder which feeds pellet material to the pellet production apparatus.
Another object of the present invention is to add to such an improved pellet production apparatus a function to operate free also from both the viscosity of the pellet material and the inner pressure of the material feeding extruder.
To achieve the above objects, an apparatus according to the present invention consists basically of a stationary hollow cylindrical sheath having a large number of orifices as nozzles and of a cylindrical rotor having lengthwise surface grooves, a coaxially bored compressed-air introducing path, a plurality of radially directed air blow holes provided at ridge portions formed as a result of the provision of the above lengthwise surface grooves and a driving mechanism for rotating the c~lindrical rotor, the above radially directed air blow holes communicating with the above coaxially bored compressed-air introducing path. With the thus constituted pellet production apparatus attached to the materlal extrusion end of an extruder with the cylindrical rotor kept coaxial with the screw~of the extruder, a pellet material pushed into the pellet production apparatus from the extruder i5 transferred along the grooves of the rotor, pushed out from the orifices provided on the sheath, cut out to form pellets by the edges of the above - ^ 1 307635 mentioned ridge portions as the rotor rotates. The thus formed pellets are blown out by the compressed air supplied through the radially directed air blow holes.
According to the present invention, because the rotor is not connected to the screw of a material feeding extruder, but driven by a separate driving mechanism independently of the rotation of the screw of the extruder, the rotation speed of the rotor can be independently controlled so as to produce pellets of a desired length, irrespective of a pellet material feeding speed that depends on the inner pressure and screw rotation speed of the extruder and on the viscosity of the material.
srief Description of the Drawings In the following, the present invention is described in further detail in reference to the accompanying drawings, in which:
Fig. 1 shows lengthwise cross-sectionally an embodiment of the present invention as applied to an extruder;
Fig. 2 shows the cross-sectional view taken along line A-A of Fig. l;
Fig. 3 illustrates the function of the present invention; and Fig. 4 shows a lengthwise cross-sectional view of ~:
~ another embodiment of tha present invention.
:
~;,,~ :
~ .
` 1 307635 Detailed Description of the Invention Referring to Fig. 1, which shows a cross-sectional view of an embodiment of the invention as applied to an extruder, a mantle cylinder 1 and a screw 2 represent the extrusion end portion of the extruder to which the present embodiment is applied, while the pellet production apparatus according to the invention consists fundamentally of a multi-perforated hollow cylinder 3, a cylindrical rotor 5 provided with tapered grooves 7 etc. and a rotor driving mechanism comprising two bearings 10, 11, a pair of gears 12, 13, a motor 4 and a shaft connector 14 through which a rotor driving force is transmitted to the gear 13 from the motor 4.
In such a fundamental constitution, the multi-perforated hollow cylinder 3 has its cylindrical wall provided with a large number of orifices 3a acting as nozzles, and has its one end fixed to the flange 9 at the outlet of the extruder mantle cylinder 1. The other end of the multi-perforated hollow cylinder 3 is held by a pair of ring members 18 and 19.
The ring member 18 is fixed through a support (not shown) to a machine base (not shown) or the ground, while the ring member 19 is provided with a groove l9a and a material leakage discharge hole 19b. On the other hand, the cylindrical rotor 5, in which is bored along its axis a compressed--air introducing path 6, has its one end portion directed toward the extruder screw 2, inserted in the multi-perforated sheath 3 and provided with first grooves 7, second grooves 8 and radially t'^~
. . .
.
::
directed air-blow through holes 17 communicating between the second groove 8 and the compressed-air introducing path 6. The first grooves 7 are tapered so as to be made deeper toward the extruder with the groove ends made open thereto to accept a pellet material and so as to be made shallower in the opposite direction, vanishing at the position corresponding to the outside end where the multi-perforated hollow sheath 3 is held by the ring members 18 and 19. The second grooves 8 are made flat and shallow with their end not made open to the extruder.
The first grooves 7 and the second grooves 8 are disposed alternately on the periphery of the cylindrical rotor 5. At the open end of the compressed-air introducing path 6 there are inserted, with slidably air-tight seals 16 interposed, a compressed-air pipe 15 bridging the path 6 and a compressed-air source (not shown). Further, the cross-section of the first grooves 7 is not symmetrical, as is shown in Fig. 2 which shows the cross-sectional view taken along line A-A of Fig. 1.
Referring to Fig. 2, the curvature of curves profiling the cross-section of grooves 7 is made larger in the rotating direction (indicated by a curved dart) of the rotor 5, as is shown by reference signs 7a and 7b. According to such cross-sectional profiles of the grooves 7, the pellet material existing at smaller curvature regions 7b is pressed over a wide range toward the multi-perforated sheath 3 in the process of the rotation of the rotor 5.
With the apparatus constituted as described above, a ..:
" " . , pellet material extruded from the extruder is pushed into the first grooves 7 and then pushed out from the orifices 3a of the multi-perforated sheath 3. The material pushed out from the orifices 3a is cut out to form pellets, as the rotor 5 rotates, by the ridge portions formed between the first and the second grooves 7 and 8. The pellets, which may stick in the orifices 3a just after formed, are blown out by the compressed air supplied through the air-blow through holes 17, as is illustrated by Fig. 3 which shows an enlarged partlal cross-sectional view of the present apparatus. In the above process of pellet production, a small amount of pellet material that failed to be pushed out from the orifice 3a of the sheath 3 leaks into the groove l9a of the ring member 19 through a thin clearance undesirably left between the inner periphery of the sheath end portion and the outer periphery of the rotor 5, and then discharged out through the material leakage discharge hole l9b.
According to the present invention, as is easily understood from the above description, the length of produced pellets can be determined at will by controlling the rotation speed of the rotor 5 in accordance with the viscosity of the material, the inner pressure and screw rotation speed of the extruder.
Incidentally, the mu1tl-perforated hollow cylindrical sheath 3 is preferably made of a material having a high tensile strength, such as a tainie~s steel and a titarium based alloy.
.~
, Further, the first grooves ~ may be made not only tapered but also screw-shaped. In this case the second grooves 8, which are not tapered, are also made screw-shaped in accordance with the screw shape of the first grooves 7.
Fig. 4 shows another embodiment modified so as to be suitable to be applied to a biaxial or two-screw extruder.
In this embodiment the rotor 5 has its end portion prolonged so as to be inserted between two screws 21 and 22 of the extruder, and grooves 71 (which correspond to the grooves 7 in the preceding embodiment) are made not straight but screw-shaped to make it easy to take in a pellet material.
The present invention can be embodied also by making both the multi-perforated sheath and the rotor slightly tapered so as to be smaller in diameter toward the extruder at a tapering ratio of 1/100 to 2/100. In such an embodiment, the wear of the sheath and the rotor can be lessened by adjusting the relative posltion between both the elements along the common axis with a suitable adusting mechanism added to the apparatus.
Further, in case the close fitting between the multi-perforated sheath and the rotor ~ay be spoiled because the sheath is made to bulge by a high feeding pressure of the pellet materlal, the sheath may be finished so that its unaffected inner diameter may be somewhat larger than the outer diameter of the rotor.
Claims (3)
1. A pellet production apparatus to be attached to an extruder for feeding a pellet production material to said apparatus, said apparatus comprising;
a stationary multi-perforated hollow cylindrical sheath (3) provided with on its cylindrical wall a plurality of orifices (3a) acting as nozzles, said sheath (3) being to be fixed to the extrusion end of said extruder;
a cylindrical rotor (5) rotatably closely inserted over a predetermined length into said sheath (3) with one end directed toward said extruder, said rotor (5) having a compressed-air intake path (6) bored along the central axis of said rotor (5), first lengthwise surface-grooves (7) with their bottoms tapered toward said extruder, second lengthwise surface-grooves (8) with their bottoms kept parallel to the central axis of said rotor (5) and radially directed air-blow paths (17) communicating between said compressed-air intake path (6) and said second lengthwise surface-grooves (8), said first lengthwise surface grooves (5) and said second lengthwise surface grooves (8) being disposed alternately on the periphery of said rotor (5); and a rotor driving means (10, 11, 12, 13, 4) for rotating said rotor (5).
a stationary multi-perforated hollow cylindrical sheath (3) provided with on its cylindrical wall a plurality of orifices (3a) acting as nozzles, said sheath (3) being to be fixed to the extrusion end of said extruder;
a cylindrical rotor (5) rotatably closely inserted over a predetermined length into said sheath (3) with one end directed toward said extruder, said rotor (5) having a compressed-air intake path (6) bored along the central axis of said rotor (5), first lengthwise surface-grooves (7) with their bottoms tapered toward said extruder, second lengthwise surface-grooves (8) with their bottoms kept parallel to the central axis of said rotor (5) and radially directed air-blow paths (17) communicating between said compressed-air intake path (6) and said second lengthwise surface-grooves (8), said first lengthwise surface grooves (5) and said second lengthwise surface grooves (8) being disposed alternately on the periphery of said rotor (5); and a rotor driving means (10, 11, 12, 13, 4) for rotating said rotor (5).
2. A pellet production apparatus as defined in Claim 1, wherein said stationary multi-perforated cylindrical sheath (3) is made of a titanium-based alloy.
3. A pellet production apparatus as defined in Claim 1, wherein said stationary multi-perforated hollow cylindrical sheath (3)is made of a stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000596757A CA1307635C (en) | 1989-04-14 | 1989-04-14 | Pellet production apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000596757A CA1307635C (en) | 1989-04-14 | 1989-04-14 | Pellet production apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1307635C true CA1307635C (en) | 1992-09-22 |
Family
ID=4139914
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000596757A Expired - Lifetime CA1307635C (en) | 1989-04-14 | 1989-04-14 | Pellet production apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1307635C (en) |
-
1989
- 1989-04-14 CA CA000596757A patent/CA1307635C/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |