US3733156A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Injection moulding machines
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1971-04-12
•
Granted: 1973-05-15
•
Expires: 1991-04-12
Abstract
Abstract There is provided apparatus for moulding laminar articles. Two screw-injection barrels are arranged to sequentially pass resinous materials through a valve, in the fixed platen of an injection moulding machine or in the walls of the mould cavity, in a single sprue into the mould cavity. Control means are provided to control the valve so that material from one screwinjection barrel does not pass while material flows from the other screw-injection barrel. The control means is synchronized so that the desired quantities of materials from two injection barrels are placed in the mould cavity.
Inventors
- 👤 P Garner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:13
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/02; B29C44/04; B29C44/0461; B29C44/0492; B29C45/00; B29C45/16; B29C45/1603; B29C45/1606
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
257 words
An injection moulding machine for moulding laminar articles having an outer surface layer and at least one inner core layer of resinous material wherein at least two of the layers are composed of different resinous compositions, comprising a first screw-injection barrel operably connected through a sprue to a mould cavity for injecting a first resinous material through the sprue and into the mould cavity, at least one additional screwinjection barrel operably connected through said sprue to said mould cavity for injecting at least one additional resinous material which is different in composition from said first resinous material through said sprue and into said mould cavity, a valve means, formed in the fixed platen of the moulding machine, for passing the resinous material from said first and additional screw-injection barrels into said mould, said valve means being operably connected to said screw-injection barrels, control means for the valve means for controlling, in sequence, the passing of resinous material from said first screw-injection barrel into the sprue, then the passing of resinous material from said additional screw-injection barrel into the sprue and then for preventing resinous material from passing from any of said screw barrels into said sprue and for preventing any resinous material from passing back out of said mould into the sprue, and means for synchronizing the control means for said valve means during a moulding cycle, whereby a predetermined quantity of said first resinous material is injected into the mould and whereby a predetermined quantity of said additional resinous material is thereafter injected into the mould.
Claim 2
Dependent Claim
257 words
An injection moulding machine for moulding laminar articles having an outer surface layer and at least one inner core layer of resinous material wherein at least two of the layers are composed of different resinous compositions, comprising a first screw-injection barrel operably connected through a sprue to a mould cavity for injecting a first resinous material through the sprue and into the mould cavity, at least one additional screwinjection barrel operably connected through said sprue to said mould cavity for injecting at least one additional resinous material which is different in composition from said first resinous material through said sprue and into said mould cavity, a valve means, formed in the fixed platen of the moulding machine, for passing the resinous material from said first and additional screw-injection barrels into said mould, said valve means being operably connected to said screw-injection barrels, control means for the valve means for controlling, in sequence, the passing of resinous material from said first screw-injection barrel into the sprue, then the passing of resinous material from said additional screw-injection barrel into the sprue and then for preventing resinous material from passing from any of said screw barrels into said sprue and for preventing any resinous material from passing back out of said mould into the sprue, and means for synchronizing the control means for said valve means during a moulding cycle, whereby a predetermined quantity of said first resinous material is injected into the mould and whereby a predetermined quantity of said additional resinous material is thereafter injected into the mould.
Claim 3
Dependent Claim
82 words
An injection moulding machine according to claim 1 in which the valve comprises a tap provided with channels, each of which is adapted to permit material to flow from one of the barrels into the sprue while the material is prevented from flowing from the other barrels into the sprue and by switching the tap material is then permitted to flow from another of said barrels into the sprue and which may be switched to prevent any material flowing into the sprue.
Claim 4
Dependent Claim
17 words
An injection moulding machine according to claim 1 in which there are only two separate screw-injection barrels.
Claim 5
Dependent Claim
24 words
An injection moulding machine according to claim 1 in which The barrels of the two injection moulding machines are aligned parallel to each other.
Claim 6
Dependent Claim
257 words
An injection moulding machine for moulding laminar articles having an outer surface layer and at least one inner core layer of resinous material wherein at least two of the layers are composed of different resinous compositions, comprising a first screw-injection barrel operably connected through a sprue to a mould cavity for injecting a first resinous material through the sprue and into the mould cavity, at least one additional screw-injection barrel operably connected through said sprue to said mould cavity for injecting at least one additional resinous material which is different in composition from said first resinous material through said sprue and into said mould cavity, a valve means, formed in the walls of the mould cavity, for passing the resinous material from said first and additional screw-injection barrels into said mould, said valve means being operably connected to the said screw-injection barrels, control means for the valve means for controlling, in sequence, the passing of resinous material from said first screw-injection barrel into the sprue, then the passing of resinous material from said additional screw-injection barrel into the sprue and then for preventing resinous material from passing from any of said screw barrels into said sprue and for preventing any resinous material from passing back out of said mould into the sprue, and means for synchronizing the control means for said valve means during a moulding cycle, whereby a predetermined quantity of said first resinous material is injected into the mould and whereby a predetermined quantity of said additional resinous material is thereafter injected into the mould.
Claim 7
Dependent Claim
257 words
An injection moulding machine for moulding laminar articles having an outer surface layer and at least one inner core layer of resinous material wherein at least two of the layers are composed of different resinous compositions, comprising a first screw-injection barrel operably connected through a sprue to a mould cavity for injecting a first resinous material through the sprue and into the mould cavity, at least one additional screw-injection barrel operably connected through said sprue to said mould cavity for injecting at least one additional resinous material which is different in composition from said first resinous material through said sprue and into said mould cavity, a valve means, formed in the walls of the mould cavity, for passing the resinous material from said first and additional screw-injection barrels into said mould, said valve means being operably connected to the said screw-injection barrels, control means for the valve means for controlling, in sequence, the passing of resinous material from said first screw-injection barrel into the sprue, then the passing of resinous material from said additional screw-injection barrel into the sprue and then for preventing resinous material from passing from any of said screw barrels into said sprue and for preventing any resinous material from passing back out of said mould into the sprue, and means for synchronizing the control means for said valve means during a moulding cycle, whereby a predetermined quantity of said first resinous material is injected into the mould and whereby a predetermined quantity of said additional resinous material is thereafter injected into the mould.
Claim 8
Dependent Claim
82 words
An injection moulding machine according to claim 5 in which the valve comprises a tap provided with channels, each of which is adapted to permit material to flow from one of the barrels into the sprue while the material is prevented from flowing from the other barrels into the sprue and by switching the tap material is then permitted to flow from another of said barrels into the sprue and which may be switched to prevent any material flowing into the sprue.
Claim 9
Dependent Claim
17 words
An injection moulding machine according to claim 5 in which there are only two separate screw-injection barrels.
Claim 10
Dependent Claim
24 words
An injection moulding machine according to claim 5 in which the barrels of the two injection moulding machines are aligned parallel to each other.
References Cited (Backward Citations)
US97366A
Cited
US264573A
Cited
US1671405A
Cited
US2174779A
Cited
US2443554A
Cited
US2674007A
Cited
US3530889A
Cited
US3417433A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |