METHOD AND APPARATUS FOR IMPROVED DETECTION OF HOLES IN PLASTIC CONTAINERS
First Claim
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1. A method for monitoring the production of blow molded plastic containers to detect a defect in any of the containers comprising the steps of:
- a. introducing pressure fluid to an interior of a preform in a mold cavity to form a blow molded plastic container;
b. providing a sound detector assembly including a reflector having a substantially conic section cross-sectional shape and a sound detector;
c. acoustically sensing a defect sound with the sound detector assembly resulting from the pressure fluid escaping from the interior of the container; and
d. generating a control signal in response to the sensed defect sound.
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Abstract
A method and apparatus for monitoring the production of blow molded plastic containers is disclosed, wherein the method and apparatus utilize a sound detector assembly adapted to be positioned adjacent a mold cavity during the introduction of pressure fluid to a preform in the mold cavity to form a container, the sound detector assembly including a reflector having a substantially conic cross-sectional shape and a sound detector and being responsive to a defect sound of the pressure fluid escaping from the interior of the container for generating an output signal.
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Citations
20 Claims
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1. A method for monitoring the production of blow molded plastic containers to detect a defect in any of the containers comprising the steps of:
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a. introducing pressure fluid to an interior of a preform in a mold cavity to form a blow molded plastic container; b. providing a sound detector assembly including a reflector having a substantially conic section cross-sectional shape and a sound detector; c. acoustically sensing a defect sound with the sound detector assembly resulting from the pressure fluid escaping from the interior of the container; and d. generating a control signal in response to the sensed defect sound. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An apparatus for monitoring the production of blow molded plastic containers formed by introducing pressure fluid to an interior of a preform in a mold cavity comprising:
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a sound detector assembly adapted to be positioned adjacent a mold cavity during the introduction of pressure fluid to a preform in the mold cavity to form a container, said sound detector assembly including a sound detector and a reflector having a substantially conic section cross-sectional shape and being responsive to a defect sound of the pressure fluid escaping from the interior of the container for generating an output signal; and means for generating a control signal in response to said output signal whereby a container rejecter receiving said control signal rejects the container. - View Dependent Claims (15, 16, 17, 18)
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19. An apparatus for monitoring the production of blow molded plastic containers formed by introducing pressure fluid to an interior of a preform in a mold cavity comprising:
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a sound detector assembly adapted to be positioned adjacent a mold cavity during the introduction of pressure fluid to a preform in the mold cavity to form a container, said sound detector assembly including a sound detector responsive to a defect sound of the pressure fluid escaping from the interior of the container for generating an output signal and a reflector having a substantially conic section cross-sectional shape and a support extending between walls thereof, the support forming an aperture adapted to receive the sound detector; and means for generating a control signal in response to said output signal whereby a container rejecter receiving said control signal rejects the container. - View Dependent Claims (20)
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Specification