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Method and apparatus for detecting holes in plastic containers

  • US 7,040,167 B2
  • Filed: 10/31/2002
  • Issued: 05/09/2006
  • Est. Priority Date: 11/01/2001
  • Status: Expired due to Fees
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. loading a preform into a mold cavity at a loading station;

    b. introducing pressure fluid to an interior of the preform in the mold cavity to form a blow molded plastic container while moving the mold cavity along a generally circular path;

    c. acoustically sensing a defect sound resulting from the pressure fluid escaping from the interior of the container being formed at a position adjacent the path and within a portion of the path from one point at onset of preblow air to another point just after onset of high blow air; and

    d. generating a control signal in response to the sensed defect sound.

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