Plastic article or earthenware shaping or treating: apparatus – Control means responsive to or actuated by means sensing or... – Feed control of material en route to shaping area
Reexamination Certificate
2000-10-30
2003-07-08
Heitbrink, Tim (Department: 1722)
Plastic article or earthenware shaping or treating: apparatus
Control means responsive to or actuated by means sensing or...
Feed control of material en route to shaping area
C264S040300, C264S040700, C264S328800, C425S149000, C425S572000
Reexamination Certificate
active
06589039
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to injection of pressurized materials through a distribution system, such as injection molding of plastic melt in a hot runner system. More specifically, this invention relates to an improved injection molding hot runner system in which a single controller controls the rate of melt flow through two or more gates.
DESCRIPTION OF THE RELATED ART
U.S. Pat. No. 5,556,582 discloses a multi-gate single cavity system in which the rate of melt flow through the individual gates is controlled independently via a control system according to specific target process conditions. This system enables the weld line of the part (the section of the part in which the melt from one gate meets the melt from another gate) to be selectively located. It also enables the shape of the weld line to be altered to form a stronger bond.
The '582 patent discloses controlling the rate of melt flow with a tapered valve pin at the gate to the mold cavity. It also discloses placing a pressure transducer inside the mold cavity. Placing the pressure transducer inside the mold cavity can result in the pressure transducer sensing pressure spikes which can occur when the valve pin is closed. A pressure spike sensed by the transducer can cause an unintended response from the control system, and result in a less precise control of the melt flow than desired.
The control system disclosed in the '582 patent uses the variables of valve pin position and cavity pressure to determine what position the valve pin should be in. Thus, the algorithm performed by the control system in the '582 patent utilizes two variables to control the rate of melt flow into the cavity.
SUMMARY OF THE INVENTION
An injection molding system comprising a manifold for distributing material injected from said injection molding machine to first and second runners, wherein the first runner leads to first and second gates, and a controller to control the rate of material flow though the first runner, independently of the second runner.
A distribution system for distributing melt flow comprising a first runner that comprises a plurality of distribution nozzles, a second runner comprising at least one distribution nozzle and a controller capable of controlling the material flow to the first runner independently of the second runner.
A method of injection molding, comprising feeding a material to a manifold, feeding the material from the manifold to a runner that leads to first and second gates and controlling material flow at a point in the first runner to thereby control the rate of material flow through the first and second gates.
An injection molding system comprising a manifold for distributing material to a runner, a plurality of gates coupled to the runner, and a controller positioned in the runner to control the flow of material to the plurality of gates.
REFERENCES:
patent: 3535742 (1970-10-01), Marcus
patent: 3780764 (1973-12-01), Geist
patent: 3820928 (1974-06-01), Lemelson
patent: 3861841 (1975-01-01), Hanning
patent: 3952927 (1976-04-01), Schaumburg et al.
patent: 4389002 (1983-06-01), Devellian et al.
patent: 4500279 (1985-02-01), Devellian et al.
patent: 4521179 (1985-06-01), Gellert
patent: 4588367 (1986-05-01), Schad
patent: 4592711 (1986-06-01), Capy
patent: 4701292 (1987-10-01), Valyi
patent: 4863369 (1989-09-01), Schad et al.
patent: 4931234 (1990-06-01), Schad et al.
patent: 4932854 (1990-06-01), Matsuda et al.
patent: 5078589 (1992-01-01), Osuna-Diaz
patent: 5141696 (1992-08-01), Osuna-Diaz
patent: 5149547 (1992-09-01), Gill
patent: 5192555 (1993-03-01), Arnott
patent: 5281374 (1994-01-01), Matsuda et al.
patent: 5288222 (1994-02-01), Wieser
patent: 5356576 (1994-10-01), Fischbach
patent: 5389315 (1995-02-01), Yabushita
patent: 5492467 (1996-02-01), Hume et al.
patent: 5545028 (1996-08-01), Hume et al.
patent: 5554395 (1996-09-01), Hume et al.
patent: 5556582 (1996-09-01), Kazmer
patent: 5601773 (1997-02-01), Schmidt et al.
patent: 5674439 (1997-10-01), Hume et al.
patent: 5871786 (1999-02-01), Hume et al.
patent: 5885624 (1999-03-01), Katsuta et al.
patent: 5885628 (1999-03-01), Swenson et al.
patent: 5894025 (1999-04-01), Lee et al.
patent: 5916605 (1999-06-01), Swenson et al.
patent: 5948448 (1999-09-01), Schmidt
patent: 5948450 (1999-09-01), Swenson et al.
patent: 5980237 (1999-11-01), Swenson et al.
patent: 6000831 (1999-12-01), Triplett
patent: 6027328 (2000-02-01), Herbst
patent: 6062840 (2000-05-01), Lee et al.
patent: 6254377 (2001-07-01), Kazmer et al.
patent: 6261075 (2001-07-01), Lee et al.
patent: 6261084 (2001-07-01), Schmidt
patent: 6287107 (2001-09-01), Kazmer et al.
patent: 6294122 (2001-09-01), Moss et al.
patent: 6309208 (2001-10-01), Kazmer et al.
patent: 6343921 (2002-02-01), Kazmer et al.
patent: 6343922 (2002-02-01), Kazmer et al.
patent: 6361300 (2002-03-01), Kazmer et al.
patent: 6419870 (2002-07-01), Lee et al.
patent: 6436320 (2002-08-01), Kazmer et al.
patent: 1204906 (1986-05-01), None
patent: 2246771 (2002-01-01), None
patent: 2034163 (1971-02-01), None
patent: 2401168 (1975-07-01), None
patent: 299 09 535 U 1 (1999-08-01), None
patent: 19811466 (1999-09-01), None
patent: 0 911 137 (1999-04-01), None
patent: 1052078 (2000-11-01), None
patent: 1 142 686 (2001-10-01), None
patent: 58 142833 (1983-08-01), None
patent: 60-212321 (1985-10-01), None
patent: 61-63428 (1986-04-01), None
patent: WO97/43105 (1997-11-01), None
patent: 98/56564 (1998-12-01), None
patent: WO 99/54109 (1999-10-01), None
patent: 99/54109 (1999-10-01), None
patent: WO99/59795 (1999-11-01), None
patent: 01/08462 (2001-02-01), None
patent: WO 02/36324 (2002-02-01), None
Translation for JapaneseUnexaminedPatent Application No. 61-53428, published Apr. 1, 1986; Applicant: NEC Corporation, Title of Invention: Mold Apparatus, Inventor: Hiroshi Koyama, pp. 1-11.
Patent Abtract of Japan, Publication No. 63166511, Date of Publication: Jul. 9, 1988; Applicant: Nissei Plastics Ind Co., Title: Injection Molding.
Patent Abstract of Japan, Publication No. 61063428, Date of Publication: Apr. 1, 1986 Applicant: Nippon Denso Co Ltd., Title: Mold Assembly.
International Search Report for International Application No. PCT/US 98/10798, filed May 27, 1998.
“Multi-Cavity Pressure Control in the Filling and Packing Stages of the Injection Molding Process”, D. Kazmer and P. Barkan, Polymer Engineering and Science. 11/97, vol. 37, No. 11, pp. 1865-1879.
“The Process Capability of Multi-Cavity Pressure Control for the Injection Molding Process”, D. Kazmer and P. Barkan, Polymer Engineering and Science, 11/97, vol. 37, No. 11, pp. 1880-1895.
“Dynamic Feed Control: A New Method for Injection Molding of High Quality Plastic Parts”. D.O. Kazmer, Jun. 1995. A Dissertation submitted to the Design Division of Mechanical Engineering and the Committee on Graduate Studies in Partial Fulfillment Of the Requirements for the Degree of Doctor of Philosophy in Mechanical Engineering.
Patent Abstracts of Japan, Publication No. 58 142833, published Aug. 25, 1983, vol. 7, No. 261: 1 pg.
Patent Abstracts of Japan, Publication No. 60 212321, published Oct. 24, 1985, vol. 10, No. 66: 1 pg.
Patent Abstracts of Japan, Publication No. 61 063428, published Apr. 1, 1986, vol. 10, No. 231: 1 pg.
Doughty Michael A.
Firisin Wesley Drew
Hume William J.
Kazmer David
Moss Mark D.
Heitbrink Tim
Kudirka & Jobse,LLP
Synventive Molding Solutions, Inc.
LandOfFree
Controlled injection using manifold having multiple feed... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Controlled injection using manifold having multiple feed..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Controlled injection using manifold having multiple feed... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3039076