Patent US4890996A successfully refreshed from Google Patents.
US4890996A
Expired / Lapsed
US
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Continuous granulating machine
Assignee: Japan Steel Works Ltd
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Filing: 1982-11-18
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Granted: 1990-01-02
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Expires: 2002-11-18
Abstract
Abstract A continuous granulator of the double-screw type includes a mechanism by which the degree of kneading can be controlled, and prevents lateral communication between the screw ends. A gear pump connected after the screw cylinders delivers the material to the cutting unit.
Inventors
- 👤 Nobuaki Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:34
CPC Classifications
B; B29; B29B; B29B9/00; B29B9/02; B29B9/06; B29B7/00; B29B7/30; B29B7/34; B29B7/38; B29B7/46; B29B7/48; B29B7/488; B29B7/58; B29B7/72; B29B7/726; B29B7/728; B29B7/80; B29B7/84; B29B7/845; B29C; B29C48/00; B29C48/25; B29C48/265; B29C48/266; B29C48/2665; B29C48/36; B29C48/365; B29C48/37; B29C48/375; B29C48/387; B29C48/395; B29C48/40; B29C48/50; B29C48/505; B29C48/52; B29C48/92; B29B7/489; B29C37/00; B29C2037/96; B29C2948/00; B29C2948/92; B29C2948/92009; B29C2948/92019; B29C2948/92314; B29C2948/92323; B29C2948/92361; B29C2948/9238; B29C2948/924; B29C2948/92504; B29C2948/92571; B29C2948/9258; B29C2948/92809; B29C2948/92819; B29C2948/92857; B29C2948/92876; B29C2948/92885; B29C2948/92952; B29C48/03; B29C48/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
244 words
A continuous granulating machine comprising: a double screw kneader including a pair of cylinders each having a rear portion and a forwardly extending front portion with an end outlet and an inside diameter smaller than that of said rear portion of the cylinder and with said front portions defining independent cylinder chambers without any lateral mutual communication, a pair of screws mounted for rotation in said cylinders with each screw having a large diameter rear portion and a relatively short reduced diameter front portion disposed in one of said independent chambers, complementary conical shoulders on said cylinders and said screws between said front and rear portions respectively defining a clearance slot for controlling the passage of material from said rear portion to said front portion of each cylinder and means for axially moving said cylinders and said screws relative to each other to adjust said clearance to adjust the degree to which a material is kneaded by said kneader; vent means in communication with the front portion of each cylinder; a gear pump having an outlet connected to said outlet of each of said cylinders, pressure sensor means disposed intermediate said cylinders and said gear pump and operatively connected to said gear pump to control said gear pump in response to the pressure of the material being kneaded to maintain the pressure substantially constant within the range of 5-10 Kg/cm 2 , and a cutting unit connected to said outlet of said gear pump.
Claim 2
Dependent Claim
244 words
A continuous granulating machine comprising: a double screw kneader including a pair of cylinders each having a rear portion and a forwardly extending front portion with an end outlet and an inside diameter smaller than that of said rear portion of the cylinder and with said front portions defining independent cylinder chambers without any lateral mutual communication, a pair of screws mounted for rotation in said cylinders with each screw having a large diameter rear portion and a relatively short reduced diameter front portion disposed in one of said independent chambers, complementary conical shoulders on said cylinders and said screws between said front and rear portions respectively defining a clearance slot for controlling the passage of material from said rear portion to said front portion of each cylinder and means for axially moving said cylinders and said screws relative to each other to adjust said clearance to adjust the degree to which a material is kneaded by said kneader; vent means in communication with the front portion of each cylinder; a gear pump having an outlet connected to said outlet of each of said cylinders, pressure sensor means disposed intermediate said cylinders and said gear pump and operatively connected to said gear pump to control said gear pump in response to the pressure of the material being kneaded to maintain the pressure substantially constant within the range of 5-10 Kg/cm 2 , and a cutting unit connected to said outlet of said gear pump.
Claim 3
Dependent Claim
24 words
A device as claimed in claim 1, said cutting unit including die means, and discharge valve means disposed in front of said die means.
Claim 4
Dependent Claim
17 words
A device as claimed in claim 2, further including discharge valve means disposed before said gear pump.
Claim 5
Dependent Claim
17 words
A device as claimed in claim 1, further including discharge valve means disposed before said gear pump.
Claim 6
Dependent Claim
35 words
A device as claimed in claim 1, further including drive means for driving said kneader and means for detecting a pressure of said material upstream of said gear pump and for regulating said drive means.
Claim 7
Dependent Claim
251 words
A continuous granulating machine comprising: a double screw kneader including a pair of cylinders each having a rear portion and a forwardly extending front portion with an end outlet and an inside diameter smaller than that of said rear portion of the cylinder and with said front portions defining independent cylinder chambers without any lateral mutual communication, a pair of screws mounted for rotation in said cylinders with each screw having a large diameter rear portion and a relatively short reduced diameter front portion disposed in one of said independent chambers, complementary conical shoulders on said cylinders and said screws between said front and rear portions respectively defining a clearance slot for controlling the passage of material from said rear portion to said front portion of each cylinder and means for mounting said screws in a fixed axial position and means for moving said cylinders relative to said screws to adjust said clearance to adjust the degree to which a material is kneaded by said kneader; vent means in communication with the front portion of each cylinder; a gear pump having an outlet connected to said outlet of each of said cylinders, pressure sensor means disposed intermediate said cylinders and said gear pump and operatively connected to said gear pump to control said gear pump in response to the pressure of the material being kneaded to maintain the pressure substantially constant within the range of 5-10 kg/cm 2 , and a cutting unit connected to said outlet of said gear pump.
Claim 8
Dependent Claim
251 words
A continuous granulating machine comprising: a double screw kneader including a pair of cylinders each having a rear portion and a forwardly extending front portion with an end outlet and an inside diameter smaller than that of said rear portion of the cylinder and with said front portions defining independent cylinder chambers without any lateral mutual communication, a pair of screws mounted for rotation in said cylinders with each screw having a large diameter rear portion and a relatively short reduced diameter front portion disposed in one of said independent chambers, complementary conical shoulders on said cylinders and said screws between said front and rear portions respectively defining a clearance slot for controlling the passage of material from said rear portion to said front portion of each cylinder and means for mounting said screws in a fixed axial position and means for moving said cylinders relative to said screws to adjust said clearance to adjust the degree to which a material is kneaded by said kneader; vent means in communication with the front portion of each cylinder; a gear pump having an outlet connected to said outlet of each of said cylinders, pressure sensor means disposed intermediate said cylinders and said gear pump and operatively connected to said gear pump to control said gear pump in response to the pressure of the material being kneaded to maintain the pressure substantially constant within the range of 5-10 kg/cm 2 , and a cutting unit connected to said outlet of said gear pump.
Claim 9
Dependent Claim
24 words
A device as claimed in claim 6, said cutting unit including die means, and discharge valve means disposed in front of said die means.
Claim 10
Dependent Claim
17 words
A device as claimed in claim 7, further including discharge valve means disposed before said gear pump.
Claim 11
Dependent Claim
17 words
A device as claimed in claim 6, further including discharge valve means disposed before said gear pump.
Claim 12
Dependent Claim
35 words
A device as claimed in claim 6, further including drive means for driving said kneader and means for detecting a pressure of said material upstream of said gear pump and for regulating said drive means.
References Cited (Backward Citations)
US2258288A
Cited
US2515201A
Cited
US3090992A
Cited
US3070836A
Cited
US3304062A
Cited
US3525124A
Cited
US3518721A
Cited
US3376603A
Cited
US3499186A
Cited
US3649147A
Cited
US3689184A
Cited
US3802670A
Cited
US3642406A
Cited
US3876188A
Cited
US4092089A
Cited
US3991153A
Cited
US4137023A
Cited
US4171193A
Cited
US4354814A
Cited
US4336213A
Cited
US4452750A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-01 | 1993-07-03 | 1994-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-01 | 1997-07-03 | 1998-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-01 | 2001-07-03 | 2002-01-02 | $7700.00 | Window Closed / Lapsed |