US3864069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for cross-linking molding of high polymers
Assignee: Ikegai Corp
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Filing: 1973-04-02
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Granted: 1975-02-04
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Expires: 1993-04-02
Abstract
Abstract A molding apparatus provided with an extruder, a feed plunger connected with the tip of the extruder, a reaction plunger corresponding to and connected with the feed plunger, and a diehead connected with the reaction plunger, whereby the apparatus is useful in high-pressure fluid cross-linking molding of high polymers.
Inventors
- 👤 Mamoru Takiura
- 👤 Yasushi Ebisawa
- 👤 Noriyuki Kikuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:20
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/46; B29C48/00; B29C48/022; B29C48/25; B29C48/255; B29C48/2556; B29C48/36; B29C48/375; B29C48/388; B29C48/03; B29K; B29K2101/00; B29K2101/10; B29K2301/00; B29K2301/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
230 words
A high-pressure fluid cross-linking molding apparatus for use in molding high polymers, comprising: extruder means for melting and kneading a mixture composed of high polymers and a cross-linking agent by applying such temperature and pressure as will not give rise to a crosslinking reaction; a plurality of feeding units each having a feed chamber containing a relatively movable feeding plunger therein and a heating device for imparting heat energy within said chamber effective to cause a cross-linking reaction; passageway means providing communication between the discharge end of said extruder means and the feed chambers associated with the plurality of feeding units; a plurality of reaction units each having a reaction compartment and a relatively movable reaction plunger therein, each of said reaction units being associated with a corresponding one of said feeding units; a plurality of first passages connecting and providing communication between each of said feed chambers and a corresponding reaction compartment; a molding head assembly and a plurality of second passages connected to and providing communication between said reaction compartments and said molding head assembly; and transfer valve means associated with said first and second passages for alternately opening and closing said first and second passages to provide for the continuous flow from said reaction compartments to said molding head assembly while permitting intermittent and alternating flow from each of said feed chambers to a corresponding reaction compartment.
Claim 2
Dependent Claim
230 words
A high-pressure fluid cross-linking molding apparatus for use in molding high polymers, comprising: extruder means for melting and kneading a mixture composed of high polymers and a cross-linking agent by applying such temperature and pressure as will not give rise to a crosslinking reaction; a plurality of feeding units each having a feed chamber containing a relatively movable feeding plunger therein and a heating device for imparting heat energy within said chamber effective to cause a cross-linking reaction; passageway means providing communication between the discharge end of said extruder means and the feed chambers associated with the plurality of feeding units; a plurality of reaction units each having a reaction compartment and a relatively movable reaction plunger therein, each of said reaction units being associated with a corresponding one of said feeding units; a plurality of first passages connecting and providing communication between each of said feed chambers and a corresponding reaction compartment; a molding head assembly and a plurality of second passages connected to and providing communication between said reaction compartments and said molding head assembly; and transfer valve means associated with said first and second passages for alternately opening and closing said first and second passages to provide for the continuous flow from said reaction compartments to said molding head assembly while permitting intermittent and alternating flow from each of said feed chambers to a corresponding reaction compartment.
Claim 3
Dependent Claim
130 words
An apparatus according to claim 1, wherein said transfer valve means includes a shiftable valve member movable between first and second positions, said valve member when in said first position providing communication between one of said feed chambers and one of said reaction compartments while isolating the other feed chamber from the other reaction compartment, said other reaction compartment being connected in communicAtion with said molding head assembly when said valve member is in said first position; said valve member when in said second position providing direct communication between said other feed chamber and said other reaction compartment while isolating said one feed chamber from said one reaction compartment, said one reaction compartment being in communication with said molding head assembly when said valve member is in said second position.
Claim 4
Dependent Claim
72 words
An apparatus according to claim 2, wherein said valve member when being shifted between said first and second positions totally disconnects all of said feed chambers from the corresponding reaction compartments, said valve member when being shifted between said first and second positions, at least when in an intermediate location disposed between said first and second positions resulting in all of said reaction compartments being in communication with said molding head assembly.
Claim 5
Dependent Claim
34 words
An apparatus according to claim 1, further including distributor valve means associated with said passageway means for permitting the mixture as discharged from said extruder means to be alternately supplied to said feed chambers.
Claim 6
Dependent Claim
21 words
An apparatus according to claim 1, wherein said extruder means comprises a single extruder having two rotatable plasticizing screws associated therewith.
Claim 7
Dependent Claim
25 words
An apparatus according to claim 1, wherein said extruder means includes at least two screw-type extruders each being associated with one of said feeding units.
Claim 8
Dependent Claim
36 words
An apparatus according to claim 1, wherein said extruder means comprises a pair of screw-driven injection devices each having a rotatable plasticizer, and wherein each of said feeding plungers is combined with one of said plasticizers.
References Cited (Backward Citations)
US2359840A
Cited
US3218375A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |