B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/746, 18/782
B29C 55/28 (2006.01) B29C 47/00 (2006.01) B29C 49/00 (2006.01) B29C 49/40 (2006.01) B29C 51/22 (2006.01) B32B 37/28 (2006.01) B65D 65/40 (2006.01)
Patent
CA 1115914
ABSTRACT OF THE DISCLOSURE A method and apparatus for making bilaminar sheet material which is eminently suitable for usage in the packaging of goods. The sheet material is characterized by the presence of raised pockets on a continuous bilaminar planar sheet element or web. The pockets contain a gas, such as air or a gas lighter than air. The sheet material is made by extruding of heating elements arranged around the circumference of the annular circular slot to maintain the temperature of the extruded material at various points around the circumference of the annular slot at difference temperatures as it exits said slot. This circumferential variation of temperature results in the formation of a molten tubular element having a plurality of linear sidewall portions of unequal thicknesses relative to each other upon exit from the nozzle, which subsequently adjust to a uniform thickness prior to being collapsed, thereby resulting in the formation of a uniformly thick bilaminar sheet. Concomitantly with the extrusion, a slightly pressurized gas such as those mentioned above is discharged into the slotted extruder, typically through a central opening in the extruder, so that the gas fills and expands the tubular hollow element. Then the tubular element containing the gas is passed between two juxtaposed parallel cylindrical rollers which rotate in opposite directions so as to draw the tubular element into the nip between the rollers, and thereby collapse and flatten the tubular element into a continuous bilaminar planar sheet element or web. At least one of the rollers is characterized by the provision of a plurality of speed apart recesses on its outer surface, e.g. grooves, cavities or apertures, so that the continuous bilaminar planar sheet material or element, i.e. the web, is formed with raised pockets containing the aforementioned gas. The resulting sheet material possesses desirable attributes, for use in packaging of goods.
340235
Gaffney William
Mintz Charlotte
Gaffney William
Mintz Charlotte
Swabey Ogilvy Renault
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