Automated material distribution control for stretch blow molded articles
A technology of material distribution and blow molding, which is applied in the field of blow molding products from plastic parisons, can solve problems such as undiscussed and undiscussed automatic detection systems
Inactive Publication Date: 2004-12-01
博尔公司
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Problems solved by technology
U.S. Patent US4117050 discloses longitudinal heat profiling of parisons to control wall thickness distribution in blow molded articles, but does not discuss any automated inspection system for the resulting articles
Method used
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[0029] Such as figure 1 As shown, a parison 10 according to the present invention is generally formed by an injection molding process and includes a closed end 12, a sidewall portion 14, a neck 16, a finish portion 18 and an open end 20'. The parison 10 also includes at least one, and typically two or more, material distribution indicators 22, which are typically formed as circumferentially protruding rings or ridges 24, one of which is in the figure 2 Show in detail. Those skilled in the art know that the circumferential protruding rings or ridges 24 are formed during the injection molding process by corresponding grooves (not shown, typically formed by precision grinding) on the inner surface of the injection mold cavity. If the parison is formed from PET or other similar resins, the ring or ridge, also known as a distribution indicator, has a horizontal dimension t of approximately 2.5 x 10 -4 cm-12.5×10 -2 cm, the vertical dimension h is about 2.5×10 -4 cm-2.5×10 -...
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A method for inspecting the material distribution of a sequence of stretch blow molded containers (28) or other articles in a continuous production process, by providing injection molded parisons (10), each parison having at least one indicator (22), typically two or more indicators (2), for detecting material distribution at a predetermined position along the axial extent of the parison. Each of the parisons (10) is subjected to a heating stage in the continuous production process, generally by exposure to infrared heating (72,21). Each heated parison (10) is then subjected to a blow molding process, which can be a stretch blow molding process, so that each material distribution indicator is transformed to a corresponding position along the axial extent of the blow molded article (28). A detector (50) is positioned to detect the location of each indicator (22) on each blow molded article (28) from a given mold (25) in the production process. A computation is then made to determine for each blow molded article (28) a material distribution outcome or profile based on the detected locations of each indicator (22). This information on material distribution is them matched to a prescribed profile for the particular container design and any discrepancy beyond some preset tolerance value is employed to reject the out of tolerance item from the production line, and to modify a step of the manufacturing process such as the infrared heating pattern.
Description
field of invention [0001] The present invention relates generally to the field of blow molding articles from plastic parisons, and more particularly to methods and systems for producing stretch blow molded articles formed from polymeric resins and having consistent physical dimensions. Background technique [0002] Providing consistent physical dimensions, including consistent material distribution, is a longstanding problem in the production of blow molded articles like those formed from polymeric resins, such as polyethylene terephthalate (PET). The difficulty of achieving consistent physical dimensions, such as material distribution, has become a problem in assuring satisfactory quality of such articles. Additionally, difficulties arising from the lack of uniform physical dimensions can exist in various production pallets and in finding production equipment that produces substantially identical blow molded articles. Consistent physical dimensions,...
Claims
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IPC IPC(8): B29C35/08B29C49/06B29C49/36B29C49/78
CPCB29C2791/001B29C49/06B29C49/78B29K2067/00B29C49/36B29C2035/0822G01N21/9081B29C49/4238B29C49/42382B29C49/42413B29C2949/0715B29C49/6835B29C2049/78675B29C2049/7874B29C2049/78805B29C2049/801
Inventor C·戴维斯S·明顿E·罗伯茨
Owner 博尔公司