US 3,946,497 A · Apparatus for treating textile fabric to retard inflammability

Abstract

Textile fabric previously impregnated with THPOH is treated to retard inflammability by passage therethrough of toxic ammonia gas in apparatus which permits the THPOH-NH.sub.3 reaction to be carried out in a sealed chamber preventing escape of the toxic gas. The invention operates to confine the gas in a flow path whereby substantially all of the gas flowing through the apparatus is passed directly through the fabric. The fabric is passed through the sealed chamber by means of gas-tight entrance and exit portals. A perforated drum is mounted within the chamber and the fabric is passed about the perimeter of the drum. Sealing elements cooperating with the drum confine ammonia gas introduced into the interior of the drum to flow only through those perforations covered by fabric. Undue accumulation of water which is a product of the reaction is avoided by both the slanted ceiling configuration of the chamber which promotes condensate runoff and the positive gas flow velocity established within the chamber which tends to draw water vapor from the reaction site.

Claims19

Dependent claims

Apparatus for treating a continuous length of web material with a gas comprising:

a substantially gas-tight treatment chamber;
means defining a flow path for said gas through said treatment chamber;
means for continuously passing said web material across said gas flow path at a treatment location within said chamber;
and
means for constraining substantially the entire amount of said gas flowing in said path at said treatment location to flow directly through said web material;
said means defining said flow path including a hollow cylindrical shell having a cylindrical wall with orifice means therethrough enabling gas flow outwardly of said shell from the hollow interior thereof;
said constraining means including
means sealing the axial ends of said shell to prevent gas flow through said axial ends, and
means for preventing gas flow through a portion of said cylindrical shell, said portion extending partially about the circumferential perimeter of said shell and completely across the length of said shell between said axial ends sealing means.

6 more elements

Apparatus for treating a continuous length of web material with a gas comprising:

a substantially gas-tight treatment chamber;
a hollow shell having a cylindrical wall mounted within said chamber;
gas flow conduits flowing through said cylindrical wall for permitting gas to flow from the interior of said shell outwardly thereof;
an entrance portal and an exit portal in said chamber for permitting said web material to be continuously moved through the interior of said chambers;
said entrance and exit portals each including means for obstructing escape of gas from within said chamber while said web material is being moved therethrough;
means for directing said web material passing through the interior of said chamber to extend about said cylindrical wall of said shell over said gas flow conduits and across the path of gas flowing therethrough;
means for introducing said gas from the exterior of said chamber into the interior of said shell;
means for exhausting gas from within said chamber;
and
sealing means operatively positioned relative to said shell to confine gas flowing from the interior thereof to flow only through said gas flow conduits over which said web material is passing.

7 more elements

Dependencies are inferred from the claim text.

Apparatus for treating textile fabric to retard inflammability

Life of this patent

Apparatus for treating textile fabric to retard inflammability

Life of this patent

Abstract

Claims19