Method and apparatus for extrusion blow molding of shapes with an even wall thickness and varying radii
August 13, 2022. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2952034 3272896 3423495 3601858 Method of making a container having blown plastic liner and method and apparatus for forming same Bottom assist pre-blow system for blow molding machines Parison stretcher Valve gate-type injection molding method and apparatus therefor Method and apparatus for making an object of a plastic material Process and apparatus for producing a plastic blow-molded part Patent #: 6488883 InventorApplicationNo. 10216768 filed on 08/13/2002US Classes:425/526, With heating or cooling means425/527, With means to sever product425/532, Parison forming extruder264/543, Movement is arcuate or rotary264/533, Shaping is neck formation other than by closure of mold for body of article264/526, Including use of vacuum or internal venting of parison to remove fluid after application of differential fluid pressure425/86, INCLUDING HANDLING MEANS OR FEATURE FOR TREATING LIQUID OR VEHICLE LIQUID, OR CONDENSATE156/244.14, Differential fluid pressure used425/522, FEMALE MOLD AND MEANS TO SHAPE PARISON DIRECTLY BY INTERNAL FLUID PRESSURE, (E.G., BLOW MOLD, ETC.)264/515, Including forming a hollow article264/531, Including shaping by mechanical means other than fluid pressure during or subsequent to fluid pressure differential shaping264/529Including plural distinct steps of differential fluid pressure induced expansionExaminersPrimary: Davis, RobertAttorney, Agent or FirmForeign Patent References
International ClassesB29C049/04B29C049/48 B29C049/64 B29C049/48 B29C049/04 AbstractA method of extrusion blow molding is disclosed; the method allows the finished part to have consistent and even wall thickness within a broad range of local mold radii. This result is achieved without resorting to injection blow molding or other common techniques of deforming the parison.Field of SearchWith heating or cooling meansParison forming extruder With means to sever product Including application of internal fluid pressure to hollow finite length preform to force same into conformity with female mold part Including plural distinct steps of differential fluid pressure induced expansion Including extrusion Of irregular or varying cross section | |
