Method and apparatus for forming ports in drip irrigation hose

Details Method and apparatus for forming ports in drip irrigation hose Method and apparatus for forming ports in drip irrigation hose

1990-08-17

1992-06-23

Ball, Michael W.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156252, 156513, 239542, 264154, B29C 5348, B05B 1500

Patent

active

051239841

ABSTRACT:
In a high speed method and apparatus for forming inlet and/or outlet ports in drip irrigation hose, the surface of one margin of a continuous length of plastic film is deformed without puncturing at periodic intervals along its length corresponding to the locations of the inlet and/or outlet ports to form protrusions from the film surface. Thereafter, the protrusions are severed from the film to form the ports. The remainder of the hose is made in a conventional fashion. Preferably, the film surface is deformed by directing the film through the nip of pair of rotating wheels. On the surface of one of the wheels is a series of blunt projections sized, shaped and positioned to correspond to the ports being formed. The protrusions are severed by the edge of a knife across which the film is directed.

REFERENCES:
patent: 3455756 (1969-07-01), Mann
patent: 4009832 (1977-03-01), Tiedt
patent: 4175882 (1979-11-01), Gilead
patent: 4247051 (1981-01-01), Allport
patent: 4272473 (1981-06-01), Riemersma et al.
patent: 4572756 (1986-02-01), Chapin
patent: 4626130 (1986-12-01), Chapin

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