B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
154/30.01
B29C 51/10 (2006.01) B29C 51/22 (2006.01)
Patent
CA 1186204
CUSHIONING DUNNAGE APPARATUS AND METHOD ABSTRACT OF THE DISCLOSURE A method and apparatus for the production of thermoplastic film air cell cushioning product. The method and apparatus utilize as stock material flexible thermo- plastic film formed of a composite of a stratum of relative- ly high density, high melting point thermoplastic and another stratum of relatively low density, low melting point thermo- plastic bonded to the first mentioned stratum. A sheet of the composite thermoplastic film material is heated well above the melting point of the low melting point stratum but below the melting point of the high density stratum and is applied to a rotating forming drum and vacuum formed, to produce the air cells in the product, and then a sheet of the film material which has been heated, is generally immediately laminated to the heated sheet on the drum, with the temperature of the second mentioned sheet being at its application to the embossed sheet, below the melting point temperature of the low density stratum and at a maximum temperature approximating the mean temperature between the heat softening point and the Vicat softening point of the low density stratum, with the second mentioned sheet being applied with associated pressure to the heated embossed first sheet on the rotating forming drum. The apparatus is relatively compact and the method and apparatus are energy efficient.
412942
Macrae & Co.
Ranpak Corp.
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