Method of manufacture of a drip irrigation hose

  • US 6,936,126 B2
  • Filed: 07/11/2002
  • Issued: 08/30/2005
  • Est. Priority Date: 07/19/1994
  • Status: Expired due to Fees
First Claim
Patent Images

1. A method for making drip irrigation hose comprising:

  • rotating an outlet forming wheel having a knife blade on its periphery;

    positioning a backing wheel to engage the outlet forming wheel and establish a nip, the backing wheel having a circumferential slot into which the knife blade fits as the outlet forming wheel rotates;

    moving a strip of plastic film through the nip to form single slit outlets repeatedly along the strip as the knife blade rotates;

    forming on the strip an elongated flow regulating passage; and

    forming inlets to the flow regulating passage that are spaced from the outlets to form a substantial path length from each inlet to a corresponding outlet, wherein the outlets couple the flow regulating passage to the exterior of the hose.

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