Method and apparatus for making foam-in-place cushions with selective distribution of foam
View Patent ↗A method and apparatus for making a foam-in-place cushion in which a foam-forming composition is dispensed between two plastic film portions in a predetermined fashion to selectively control the distribution of the foam in the cushion. A foam dispenser can be moved in a transverse direction as foam is dispensed. A dispersion device can be employed to apply pressure on predetermined areas of the film portions towards each other so as to cause the composition to be redistributed in position in a predetermined manner while the composition is in a less than fully expanded state. The plastic film can then be sealed closed to form an expanding foam cushion that can be placed into a shipping carton where the cushion expands to fill void space, or into a mold where the cushion expands and is molded into a desired shape.
1. An apparatus for making foam-in-place cushions, comprising:
a film supply and guide system for supplying a pair of continuous polymer film portions extending along a longitudinal direction and for positioning the film portions in generally parallel opposing relation to each other;
a dispenser disposed between the film portions and operable for dispensing a foam-forming composition between the film portions, the foam-forming composition being operable to react to form an expanded polymer foam material, the dispenser being controllable to be either in an “on” state wherein foam-forming composition is dispensed from the dispenser or in an “off” state wherein dispensing of the foam-forming composition is stopped;
a film drive mechanism structured and arranged for advancing the film portions in the longitudinal direction;
a cross-sealing and cutoff device operable to seal the film portions together and to sever the film portions along a transverse line;
an automated dispenser traversing mechanism operable to selectively move the dispenser in a transverse direction relative to the film portions during dispensing of foam-forming composition or in between intermittent dispensing operations for a given cushion; and
a dispersion device structured and arranged to apply pressure in a thickness direction on a localized area of the film portions of a cushion being formed, during a time period in which the foam-forming composition for said cushion is being dispensed and prior to the cross-sealing and cutoff device's severing of the film portions, the dispersion device being adjustable in position in the thickness direction relative to the film portions.
2. The apparatus of claim 1 , wherein the dispersion device comprises a dispersion member for applying pressure on the film portions and a motor coupled to the dispersion member for adjusting the position of the dispersion member in the thickness direction.
3. The apparatus of claim 2 , wherein the dispersion member is adjustable in position in the thickness direction during formation of a given cushion.