Method for making structural foams with facing sheets

Details Method for making structural foams with facing sheets Method for making structural foams with facing sheets

1976-02-02

1978-12-19

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 453, 264 465, 264 467, 264257, 428313, 428315, 428298, B29D 2704

Patent

active

041306147

ABSTRACT:
A method for forming a structural foam article having a cellular core, a high density integral skin with fiber reinforcement embedded therein, and exterior facing sheets so as to substantially avoid blistering of the facing sheets, is disclosed. The foam article is prepared by foaming an expandable resin composition between the fiber reinforcing material and facing sheets. The resin has a predetermined viscosity which is a direct function of the porosity of the reinforcing material and an indirect function of the foam initiation time.

REFERENCES:
patent: 2727278 (1955-12-01), Thompson
patent: 2728702 (1955-12-01), Simon et al.
patent: 2841205 (1958-07-01), Bird
patent: 2993233 (1961-07-01), Hoppe et al.
patent: 3082486 (1963-03-01), Khawam et al.
patent: 3283386 (1966-11-01), Cenegy
patent: 3286004 (1966-11-01), Hill et al.
patent: 3382302 (1968-05-01), Marzocchi
patent: 3911190 (1975-10-01), Myers et al.
patent: 4005919 (1977-02-01), Hoge et al.

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