US4717324A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coinjection of hollow articles and preforms
Assignee: HUSKY INJECTION MOLDING SYSTEMS Inc
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Filing: 1986-05-12
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Granted: 1988-01-05
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Expires: 2006-05-12
Abstract
Abstract Apparatus for coinjecting a plurality of thermoplastic materials to mold an article having a layered wall structure using thermoplastic material having different optimum processing temperatures including the maintenance of the optimum temperatures in flow paths individual to each material from its source to a mold cavity.
Inventors
- 👤 Robert D. Schad
- 👤 Paul P. Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:21
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/16; B29C45/1603; B29C45/02; B29C45/1642; B29C45/1643; B29C2045/1609; B29C2045/1656
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
186 words
A coinjection molding apparatus for molding articles and preforms, said apparatus comprising: at least one mold cavity, said cavity having a nozzle including a nozzle gate individual thereto, a hot runner system including conduit means in said nozzle for supplying at least two thermoplastic materials to said nozzle gate, each material originating from a separate source and each material having a substantially different optimum processing temperature, said conduit means including a first nozzle channel providing a conduit to said gate for a first molding material, and a second nozzle channel providing a conduit to said gate for a second molding material, heating means individual to each channel for maintaining each said channel at said substantially different optimum temperature appropriate for molding material flowing through the respective channel, and insulating means in said nozzle separating said channels, said insulating means being substantially coextensive with said nozzle and with said first and second nozzle channels whereby the insulating means is operative to block heat transfer from one nozzle channel to the other so that the respective molding materials arrive at the nozzle gate at said optimum processing temperatures.
Claim 2
Dependent Claim
186 words
A coinjection molding apparatus for molding articles and preforms, said apparatus comprising: at least one mold cavity, said cavity having a nozzle including a nozzle gate individual thereto, a hot runner system including conduit means in said nozzle for supplying at least two thermoplastic materials to said nozzle gate, each material originating from a separate source and each material having a substantially different optimum processing temperature, said conduit means including a first nozzle channel providing a conduit to said gate for a first molding material, and a second nozzle channel providing a conduit to said gate for a second molding material, heating means individual to each channel for maintaining each said channel at said substantially different optimum temperature appropriate for molding material flowing through the respective channel, and insulating means in said nozzle separating said channels, said insulating means being substantially coextensive with said nozzle and with said first and second nozzle channels whereby the insulating means is operative to block heat transfer from one nozzle channel to the other so that the respective molding materials arrive at the nozzle gate at said optimum processing temperatures.
Claim 3
Dependent Claim
19 words
The apparatus of claim 1 in which the conduit means defines separate and individual channels for each thermoplastic material.
Claim 4
Dependent Claim
14 words
The apparatus of claim 2 in which each channel communicates with a shooting pot.
Claim 5
Dependent Claim
19 words
The apparatus of claim 3 in which each channel includes valve means for controlling flow to said shooting pot.
Claim 6
Dependent Claim
14 words
The apparatus of claim 4 in which the valve means define a spool valve.
Claim 7
Dependent Claim
13 words
The apparatus of claim 5 including crank means for operating said spool valves.
Claim 8
Dependent Claim
26 words
The apparatus of claim 2 in which the heating means defines separate heating elements individual to each channel for maintaining each channel at a predetermined temperature.
Claim 9
Dependent Claim
34 words
The apparatus of claim 2 in which the hot runner system includes a plurality of manifold segments, a first manifold segment incorporating a first channel and a second manifold segment incorporating a second channel.
Claim 10
Dependent Claim
23 words
The apparatus of claim 8 including heating means associated with said manifold segments for maintaining said first and second channels at different temperatures.
Claim 11
Dependent Claim
17 words
The apparatus of claim 3 including means for measuring volume of material introduced into a shooting pot.
Claim 12
Dependent Claim
16 words
The apparatus of claim 1 in which said conduit means in insulated by an air gap.
Claim 13
Dependent Claim
16 words
The apparatus of claim 11 in which said conduit means defines at least two flow paths.
Claim 14
Dependent Claim
22 words
The apparatus of claim 12 in which said air gap defines an annular space separating substantially said flow paths in said nozzle.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-01-04 | 1991-07-06 | 1992-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-04 | 1995-07-06 | 1996-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-04 | 1999-07-06 | 2000-01-05 | $7700.00 | Window Closed / Lapsed |