Making plastic film with profiles and opening means for bags

Details Making plastic film with profiles and opening means for bags Making plastic film with profiles and opening means for bags

1973-12-26

1976-03-23

Weston, Caleb

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156498, 156500, B32B 3130

Patent

active

039458725

ABSTRACT:
A method and mechanism for continuously making a plastic film with shaped profiles on the surface including extruding a continuous length of interlocking profiles from a die shaped with a precise shape for interlockingly engaging with another profile and directing a flow of coolant on the profile from a stationary coolant means and adjusting the direction of flow of coolant relative to the direction of movement of the profile or controlling the pressure and temperature of the flow of coolant to control the cooling rate and the shape of the profile.

REFERENCES:
patent: 2415644 (1947-02-01), Leonhard et al.
patent: 3462332 (1969-08-01), Goto
patent: 3780152 (1973-12-01), Kriesner

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