Heat and sound insulator of curved corrugated paperboard and met

Details Heat and sound insulator of curved corrugated paperboard and met Heat and sound insulator of curved corrugated paperboard and met

1978-03-20

1980-01-22

Goolkasian, John T.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156222, 156224, 156311, 264322, B32B 328

Patent

active

041849051

ABSTRACT:
A plane plate of corrugated paperboard, which is produced by bonding a corrugated medium and at least one liner board with a thermoplastic resin, is shaped into a curved plate by means of a hot-press so that the resin fluidifies and allows the medium and each liner board to make individual and slipping movements during press-forming. The resin hardens upon subsequent temperature reduction and affords the curved heat and sound insulator plate a good shape retentivity. This is a continuation of application Ser. No. 686,314 filed May 14, 1976, now U.S. Pat. No. 4,093,482.

REFERENCES:
patent: 2100891 (1937-11-01), Zinser
patent: 2422998 (1947-06-01), Adams et al.
patent: 3060068 (1962-10-01), Hannes
patent: 3300357 (1967-01-01), Doerfling
patent: 3920496 (1975-11-01), Wilkinson et al.

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