Method and apparatus for perforating fibrous board surfaces in n

Details Method and apparatus for perforating fibrous board surfaces in n Method and apparatus for perforating fibrous board surfaces in n

1974-01-26

1977-07-26

Schran, Donald R.

Cutting

Processes

Cutting of interdigitating products

83 2, 83 98, 83101, 144 2K, B26F 124

Patent

active

040374998

ABSTRACT:
A method and apparatus for perforating and, if desired, eroding fibrous board surfaces in a non-repetitive pattern are disclosed. The boards perforated according to the present invention are especially useful as acoustical tiles and panels. The board is formed and dried with a surface pattern developed on the board surface if desired and thereafter the board surface is punched by a series of randomly arranged pins or tacks on a plurality of rolls whereby a non-repetitive pattern results.

REFERENCES:
patent: 2010078 (1935-08-01), Hale
patent: 3013937 (1961-12-01), Brown et al.
patent: 3461754 (1969-08-01), Griffen
patent: 3470978 (1969-10-01), Wagtskjold et al.
patent: 3680419 (1972-08-01), Stoop

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