Method of making perforated vinyl film ceiling board
作者： W Walter , Chamberlain
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摘要: A standard fiber composition ceiling board is provided with an outer laminate of plasticized vinyl film. The holes in the film are smaller than board. product made by laminating to board, then perforating and pin punches. perforations stay at size which they formed, while shrink size.
参考文章(2)
David W Akerson, Manufacture of perforated acoustic boards ,(1962)
Max H Kliefoth, Sound absorbing construction ,(1930)