Textiles: manufacturing – Textile product fabrication or treatment – Fiber entangling and interlocking
Patent
1991-12-02
1993-04-20
Crowder, Clifford D.
Textiles: manufacturing
Textile product fabrication or treatment
Fiber entangling and interlocking
D04H 146, D04H 310, B32B 506, B29C 6714
Patent
active
052030598
ABSTRACT:
In a portion of the preform to be made in which the preform is to be of reduced thickness by having a recess formed therein, a mask is interposed between pairs of adjacent layers, the mask being made of a thin film of material through which the needles can pass during needling while opposing the passage of significant quantities of fiber taken by the needles, and after it has been needled, each layer is cut out around a line corresponding to the outline of the recess in the preform at the level where the layer is situated in the preform. A mask situated between two cutout layers occupies an area that is not less than the area between the cutout lines of the two layers, such that the portions of the layers that are delimited by the cutout lines are not securely connected to the remainder of the preform by the needling, thereby enabling the recess to be formed after all the layers have been needled by withdrawing the cutout portions of the layers and by peeling off the masks.
REFERENCES:
patent: 1452704 (1923-04-01), Poulin et al.
patent: 4071394 (1978-01-01), Ball
patent: 4790052 (1988-12-01), Olry
Dupont Philippe
Olry Pierre
Calvert John J.
Crowder Clifford D.
Societe Europeenne de Propulsion
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