Bubble-type cushioning and packaging sheet and method of manufac

Stock material or miscellaneous articles – Hollow or container type article – Glass – ceramic – or sintered – fused – fired – or calcined metal...


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428 349, 428 357, 428 357, 428178, 428184, 428516, 206461, 206593, 156145, 156146, B32B 312




Bubble-type flexible cushioning and packaging sheets are formed using films which are composites of single extrusion or multiple extrusion polyethylene films having density, molecular weight and, optionally, additives selected to provide a desired combination of qualities including heat sealability and low gas/vapor transmission. A preferred film material has a cross-sectional profile consisting of an inner region of linear low density polyethylene material surrounded by outer regions of high molecular weight medium density polyethylene material. The material permits the formation of preferred, square bubble configurations using a process which involves sealing two such films along generally parallel longitudinal lines; inflating the films between the longitudinal sealing lines; then sealing the films along transverse lines to form inflated rectangular pockets or bubbles therebetween.

patent: 3616158 (1971-10-01), Rubens
patent: 3756884 (1973-09-01), Hagino
patent: 3817803 (1974-06-01), Horsky
patent: 4576844 (1986-03-01), Murray et al.
patent: 4680207 (1987-07-01), Murray
patent: 4681781 (1987-07-01), Murray et al.


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