US5651998A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Injection molding system for forming a multilayered molded article
Assignee: Husky Injection Molding Systems Ltd
•
Filing: 1996-09-11
•
Granted: 1997-07-29
•
Expires: 2016-09-11
Abstract
Abstract The foregoing objects are attained by the inventive opposed gating injection method and apparatus of the instant invention for forming molded articles and for use with injection molders wherein a first mold half and a second mold half are adapted to cooperate and form at least one mold cavity. The invention includes a first injector nozzle positioned in a first mold half adjacent the cavity, for injecting a first molding resin into the cavity through a first orifice. A second injector nozzle is included which is positioned in the second mold half adjacent the cavity for injecting a second molding resin. The second resin may be different from the first resin or the same as the first resin. The second resin is injected through a second orifice unconnected with the first orifice. In accordance with the invention, the injector nozzles may be either simultaneously or sequentially activated for filling the mold cavity, and may be single material or co-injection type nozzles.
Inventors
- 👤 Rene A. Bertschi
- 👤 Edward J. Jenko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:23
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/26; B29C45/16; B29C45/1635; B29C45/1642; B29C45/1671; B29C45/14; B29C2045/1486; B29C2045/14942; B29C2045/1637; B29C2045/1651; B29C45/164; B29L; B29L2031/00; B29L2031/26; B29L2031/265; B29L2031/56; B29L2031/565
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
250 words
An injection molding system for forming a multi-layered molded article from at least two plastic molding materials, which comprises: a first mold half and a second mold half adapted to cooperate to form at least one mold cavity for forming the molded article, said mold cavity having a peripheral edge region; a first injection means positioned in said first mold half in communication with said at least one cavity for injecting a first plastic molding material into said at least one cavity through a first orifice; a second injection means positioned in said second mold half in communication with said at least one cavity for injecting a second plastic molding into said at least one cavity while the first plastic molding material is still in the fluid state in said at least one cavity, said second plastic molding material being injected through a second orifice unconnected with said first orifice, wherein said second plastic molding material is different from said first plastic molding material; at least one hot runner manifold communicating with at least one of the injection means; wherein the first and second injection means are operative to sequentially inject first and second plastic molding materials into said cavity so that the first injected plastic is forced to the edge region of said cavity to form substantially the entire edge region of the multi-layered article, and the second injected plastic forms the interior of the multi-layered article with the first injected plastic substantially completely surrounding the second injected plastic.
Claim 2
Dependent Claim
250 words
An injection molding system for forming a multi-layered molded article from at least two plastic molding materials, which comprises: a first mold half and a second mold half adapted to cooperate to form at least one mold cavity for forming the molded article, said mold cavity having a peripheral edge region; a first injection means positioned in said first mold half in communication with said at least one cavity for injecting a first plastic molding material into said at least one cavity through a first orifice; a second injection means positioned in said second mold half in communication with said at least one cavity for injecting a second plastic molding into said at least one cavity while the first plastic molding material is still in the fluid state in said at least one cavity, said second plastic molding material being injected through a second orifice unconnected with said first orifice, wherein said second plastic molding material is different from said first plastic molding material; at least one hot runner manifold communicating with at least one of the injection means; wherein the first and second injection means are operative to sequentially inject first and second plastic molding materials into said cavity so that the first injected plastic is forced to the edge region of said cavity to form substantially the entire edge region of the multi-layered article, and the second injected plastic forms the interior of the multi-layered article with the first injected plastic substantially completely surrounding the second injected plastic.
Claim 3
Dependent Claim
20 words
The system according to claim 1, wherein said first and second injection means are positioned substantially directly opposite each other.
Claim 4
Dependent Claim
26 words
The system according to claim 2, wherein said first injection means is a single material injection nozzle and said second injection means is a coinjection nozzle.
Claim 5
Dependent Claim
86 words
The system according to claim 1, wherein said first injection means comprises a first injection nozzle positioned in an opening within said first mold half such that said first material is distributed in said at least one cavity upon the actuation of said first injection nozzle and said second injection means comprises a second injection nozzle positioned in an opening within said second mold half such that said second material is distributed in said at least one cavity upon the actuation of said second injection nozzle.
Claim 6
Dependent Claim
47 words
The system according to claim 4, wherein said first injection nozzle is adapted to inject a first material having a first viscosity and said second injection nozzle is adapted to inject a second material having a second viscosity, said second viscosity being larger than said first viscosity.
Claim 7
Dependent Claim
34 words
The system according to claim 1, wherein said first injection means includes a first injection unit and a first injection nozzle, with said first injection unit and first injection nozzle being substantially in line.
Claim 8
Dependent Claim
34 words
The system according to claim 6, wherein said second injection means includes a second injection unit and a second injection nozzle, with said second injection unit positioned substantially perpendicular to said second injection nozzle.
Claim 9
Dependent Claim
56 words
The system according to claim 7, wherein said first injection means includes a first injection unit and a first injection nozzle positioned on the same horizontal plane, and wherein said second injection means includes a second injection unit and a second injection nozzle, with the second injection unit being spaced vertically from said second injection nozzle.
Claim 10
Dependent Claim
33 words
The system according to claim 8, wherein the second injection means includes a manifold for heating the second plastic molding material prior to injection of said second plastic molding material into said cavity.
Claim 11
Dependent Claim
49 words
The system according to claim 1, wherein said first and second mold halves form a plurality of cavities positioned adjacent each other, said system further comprising a set of said first and said second injection means positioned directly opposite each other for each cavity of said plurality of cavities.
Claim 12
Dependent Claim
19 words
The system according to claim 1, wherein said first and second injection means are substantially offset from each other.
Claim 13
Dependent Claim
53 words
The system according to claim 11, wherein said cavity has a substantially nonuniform cross section comprising a first portion and a second portion, said first portion being larger than said second portion, said first injection means being positioned adjacent said second portion and said second injection means being positioned adjacent said first portion.
Claim 14
Dependent Claim
19 words
The system according to claim 12, further comprising a retractable partition positioned in said cavity between said injection means.
Claim 15
Dependent Claim
32 words
The system according to claim 1, further comprising a sheet means for separating said article into two portions, said sheet means positioned in said cavity between said first and second mold halves.
Claim 16
Dependent Claim
28 words
The system according to claim 1, wherein said first mold half includes at least one female mold and said second mold half includes at least one mold core.
Claim 17
Dependent Claim
32 words
The system according to claim 15, wherein said at least one of said mold core and female mold is movable relative to said mold cavity for altering the shape of said cavity.
Claim 18
Dependent Claim
21 words
The system according to claim 1, wherein said first mold half and said second mold half are each female mold halves.
Claim 19
Dependent Claim
43 words
The system according to claim 1, wherein said first injection means is connected to a first material supply source and said second injection means is connected to a second material supply source wherein said first and second sources are unconnected to each other.
Claim 20
Dependent Claim
30 words
The system according to claim 1 including a first hot runner manifold communicating with the first injection means and a second hot runner manifold communicating with the second injection means.
References Cited (Backward Citations)
US3873656A
Cited
US4275030A
Cited
US4212626A
Cited
US4803031A
Cited
US4717324A
Cited
US5028226A
Cited
US5145630A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-07-28 | 2001-01-27 | 2001-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-07-28 | 2005-01-27 | 2005-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-07-28 | 2009-01-27 | 2009-07-29 | $7700.00 | Window Closed / Lapsed |