Variable density board having improved thermal and acoustical pr

Details Variable density board having improved thermal and acoustical pr Variable density board having improved thermal and acoustical pr

1980-07-14

1984-02-07

Hoag, Willard E.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

To produce composite, plural part or multilayered article

264230, 264321, B29D 302, B29C 1100

Patent

active

044302860

ABSTRACT:
Method for making a molded resin-impregnated fibrous article having relatively dense surface layers separated by a less dense region. The article is made by disposing curable resin-impregnated compressible fibrous layers in a mold cavity the layers being separated by a medium which is collapsible by heat before impregnating resin cures in fiber regions adjacent said medium. Upon heating, the collapsible medium shrinks or is absorbed and the adjacent fibrous material expands to fill the space left by the collapsing medium.

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