Source: http://www.google.com/patents/US4844405?dq=5958006
Timestamp: 2016-05-29 11:38:54
Document Index: 352997269

Matched Legal Cases: ['art 10', 'art 11', 'art 10', 'art 11', 'arts 10', 'art 10']

Patent US4844405 - Injection molding of thin-walled plastic products - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA mold for injection molding a plastic product having a thin-walled area includes a first mold part and a second mold part defining a mold cavity therebetween, encompassed by a parting line, for forming the plastic product, and further defining a gate for admitting injected molten plastic into the cavity....http://www.google.com/patents/US4844405?utm_source=gb-gplus-sharePatent US4844405 - Injection molding of thin-walled plastic productsAdvanced Patent SearchPublication numberUS4844405 APublication typeGrantApplication numberUS 07/007,463Publication dateJul 4, 1989Filing dateJan 26, 1987Priority dateJan 26, 1987Fee statusLapsedPublication number007463, 07007463, US 4844405 A, US 4844405A, US-A-4844405, US4844405 A, US4844405AInventorsJens O. SorensenOriginal AssigneeAcebo CompanyExport CitationBiBTeX, EndNote, RefManPatent Citations (30), Referenced by (14), Classifications (16), Legal Events (6) External Links: USPTO, USPTO Assignment, EspacenetInjection molding of thin-walled plastic products
US 4844405 AAbstract
A mold for injection molding a plastic product having a thin-walled area includes a first mold part and a second mold part defining a mold cavity therebetween, encompassed by a parting line, for forming the plastic product, and further defining a gate for admitting injected molten plastic into the cavity. The mold parts define a thin cavity region for defining the thin-walled area of the plastic product; and first and second flow channels which are portions of the mold cavity that are thicker than the thin cavity region, for directing the injected molten plastic from the gate into the thin cavity region, whereby the molten plastic directed from the first flow channel joins with the molten plastic directed from the second flow channel. The mold parts further define a meld chamber, which is a portion of the mold cavity that is thicker than the thin cavity region to enhance the melding of plastic flowing from different directions into and joining together in the meld chamber, wherein the thickest portion of the meld chamber is displaced from the gate and the flow channels by the thin cavity region. The meld chamber is at least partially located extensively between the flow channels where molten plastic directed into the thin cavity region by the first flow channel joins molten plastic directed into the thin cavity region by the second flow channel.
1. A mold for injection molding a plastic product having a thin-walled area, comprisinga first mold part and a second mold part defining a mold cavity therebetween, encompassed by a parting line, for forming the plastic product, and further defining a gate for admitting injected molten plastic into the cavity; wherein the mold parts define a thin cavity region for forming the thin-walled area of the plastic product; first and second flow channels, which are portions of the mold cavity that are thicker than the thin cavity region, and define boundaries of said thin cavity region for directing the injected molten plastic into the thin cavity region, whereby the molten plastic directed from the first flow channel joins with the molten plastic directed from the second flow channel; and a meld chamber, which is a portion of the mold cavity that is thicker than the thin cavity region, the meld chamber being at least partially located extensively between the flow channels where molten plastic directed into the thin cavity region by the first flow channel joins molten plastic directed into the thin cavity region by the second flow channel, wherein the meld chamber is displaced from the gate and the flow channels by the thin cavity region for enhancing the melding of plastic flowing from different directions into and joining together in the meld chamber. 2. A mold according to claim 1, wherein at least one of the flow channels is bifurcated.
7. A mold according to claim 1, for injection molding and controlling the dimensions of a hollow plastic product having side walls defined by the thin cavity regions.wherein one of the mold parts includes a retractable portion adjacent the gate, with the retractable portion being movable between a protracted position and a retracted position while the mold is closed; wherein the mold parts define primary flow channels extending from the gate, which, when the retractable portion of the one mold part is protracted, direct initially injected molten plastic from the gate to create stabilizing region of stiffened plastic, to thereby impede lateral deflection of the mold parts with respect to each other when additional molten plastic subsequently is injected; and wherein the first and second flow channels defined by the mold parts are secondary flow channels, which are significantly thicker than adjacent portions of the mold cavity; which are adjacent to the gate, but, when the retractable portion is protracted, are isolated from the gate by the retractable portion; which are interposed between the primary flow channels; and which, when the retractable portion is retracted, direct the subsequently injected molten plastic between the stabilizing regions of stiffened plastic and into the side-wall-defining region of the mold cavity beyond the stabilizing regions. 8. A mold according to claim 1, wherein there is a third flow channel isolated from the meld chamber and located between the meld chamber and the gate.
The present invention provides an improved mold for injection molding of thin-walled plastic products using a mold of the type described above.
FIG. 1 is a schematic view of amold in a preferred embodiment of the present invention.
Referring to FIG. 1, a mold for use in the present invention includes a hollow mold part 10 and a core mold part 11. The core mold part has a retractable inner portion 12 and an outer portion 13. When clamped together to form the mold, the hollow mold part 10 and the core mold part 11 define a mold cavity 14 therebetween for forming a hollow plastic product. The two mold parts 10, 11 are encompassed by a parting line 16 and further define a gate 17 for admitting molten injected plastic into the mold cavity 14. The mold cavity 14 is centered about an axis 18, and the gate 17 is axially disposed in the mold cavity 14. The retractable inner core portion 12 is axially-movable and when protracted is in contact with the hollow part 10 adjacent the gate 17.
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FrankMethod for producing a gas-tight plastic closure for containersUS5833913 *Dec 29, 1997Nov 10, 1998Ford Global Technologies, Inc.Injection molding method forming strengthened weld lineUS6403003Aug 10, 1999Jun 11, 2002Jetta Company LimitedInjection molded doll headUS6599460Jul 3, 2000Jul 29, 2003Sorensen Research And Develpoment TrustPrevention of void-based-irregularity formation in thin-wall, injection-molded plastic productUS7455518 *Feb 16, 2007Nov 25, 2008Rexam Prescription Products Inc.Injection moldingUS8256640Sep 4, 2012Ropak CorporationContainer apparatus and related methodsUS8418875Jan 12, 2004Apr 16, 2013Sorensen Research And Development TrustCoherent product including partially separated plastic opposing wall-section componentsUS20060013975 *Jan 12, 2004Jan 19, 2006Sorensen Jens OCoherent product including partially separated plastic opposing wall-section componentsUS20070154590 *Feb 16, 2007Jul 5, 2007Anctil Albert RInjection moldingUS20090152280 *Aug 19, 2008Jun 18, 2009Frano LuburicContainer apparatus and related methodsUS20140134287 *Nov 14, 2012May 15, 2014Jerry Wang LeeMold for traffic conesCN100439075CAug 15, 2006Dec 3, 2008章辉敏Improved process for forming plastic clothes rackCN103587025A *Oct 15, 2013Feb 19, 2014国家电网公司Process for molding butadiene-component-containing plastic thin-wall product* Cited by examinerClassifications U.S. Classification249/124, 249/142, 249/149, 425/577, 249/160, 249/151International ClassificationB65D1/26, B29C45/36, B29C45/00Cooperative ClassificationB65D1/26, B29C45/0046, B29C2045/363, B29C45/36European ClassificationB65D1/26, B29C45/36, B29C45/00HLegal EventsDateCodeEventDescriptionJan 28, 1987ASAssignmentOwner name: ACEBO COMPANY, 7910 IVANHOE AVENUE, STE 203, LA JOFree format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SORENSEN, JENS O.;REEL/FRAME:004665/0025Effective date: 19870126Aug 17, 1987ASAssignmentOwner name: PRIMTEC, P.O. BOX 2403, RANCHO SANTA FE, CALIFORNIFree format text: LICENSE;ASSIGNOR:ACEBO COMPANY;REEL/FRAME:004763/0257Effective date: 19870812Owner name: PRIMTEC,CALIFORNIAFree format text: LICENSE;ASSIGNOR:ACEBO COMPANY;REEL/FRAME:004763/0257Effective date: 19870812Jan 22, 1988ASAssignmentOwner name: ACEBO COMPANY, 7910 IVANHOE AVENUE, SUITE 203, LAFree format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SORENSEN, JENS O.;REEL/FRAME:004817/0575Effective date: 19880118Feb 3, 1993REMIMaintenance fee reminder mailedJul 4, 1993LAPSLapse for failure to pay maintenance feesSep 21, 1993FPExpired due to failure to pay maintenance feeEffective date: 19930704RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services