Expanded product having a plurality of cells open at one end

Details Expanded product having a plurality of cells open at one end Expanded product having a plurality of cells open at one end

1975-06-18

1979-04-10

Epstein, Henry F.

Stock material or miscellaneous articles

Structurally defined web or sheet

Honeycomb-like

428137, 428178, B32B 312

Patent

active

041489543

ABSTRACT:
A low pressure process for expanding the cross-section of a blank of thermoformable material between a pair of mold plates having perforation means therein, with the perforation means of one plate being selectively out of alignment with the perforation means in the second plate, the expansion leading to the formation of one or more voids having a partial vacuum or reduced pressure within the cross-section of the blank, which comprises venting the voids during the expansion of the cross-section so as to equilibrate the level of pressure within the voids with the level of pressure without the blank so as to thereby regulate the uniformity and integrity of the resulting cross-sectional geometry of the expanded blank.
Products having an expanded cross-section are formed by such process.

REFERENCES:
patent: 770293 (1904-09-01), Kendrick
patent: 1875188 (1932-08-01), Williams
patent: 1965265 (1934-07-01), Spohn
patent: 2549189 (1947-02-01), Gabo
patent: 2809908 (1957-10-01), French
patent: 3011602 (1961-12-01), Ensrud et al.
patent: 3086899 (1963-04-01), Smith et al.
patent: 3525663 (1970-08-01), Hale
patent: 3919445 (1975-11-01), Smarook
patent: 3919446 (1975-11-01), Smarook

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