Title: Heat and sound insulator of curved corrugated paperboard and method of shaping same

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.

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Inventors: Ogata, Mitsutoshi (Fukuoka, JP)
Naito, Norinao (Fukuoka, JP)

Application Number: 888039
Filing Date: 1978-03-20
Publication_date: 1980-01-22
Assignee: Nissan Motor Company, Limited (Yokohama, JP); Fukuoka Paper Company, Limited (Fukuoka, JP)
Primary Class(es): 156/221 156/222, 156/224, 156/311, 264/322
Other Classes:
US Patent Ref:

2100891	Nov, 1937	Zinser	264/287.
2422998	Jun, 1947	Adams et al.	156/224.
3060068	Oct, 1962	Hannes	156/224.
3300357	Jan, 1967	Doerfling	156/224.
3920496	Nov, 1975	Wilkinson et al.	428/182.

Other Refs: 47-4185149-138175

, 1972	JP.
, 1974	JP.

Primary Examiner: Goolkasian, John T.
Assistant Examiner:
Attorney: Lowe, King, Price & Becker