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US3660013A Expired / Lapsed US ⏱️ 0.0 years remaining

Method and apparatus for producing a durable press in garments containing cellulose or cellulosic derivatives

Assignee: American Laundry Machinery Co
•
Filing: 1969-08-01
•
Granted: 1972-05-02
•
Expires: 1989-08-01
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Abstract

Abstract A novel treating method and commercial apparatus for carrying out this method have been developed for reacting prepressed cellulosic and cellulosic-blend garments with cross-linking agents in a gaseous phase to impart a durable press thereto. The durable press finish is imparted by placing the garments in a closed chamber typically at room temperature from 70*F to 80*F or, if preheated, at a temperature not in excess of 150*F, adding formaldehyde gas and sulphur dioxide gas and steam for several minutes causing the temperature in the chamber to rise due to the steam, cutting off the steam and allowing the temperature to drop to saturate the atmosphere and cause greater condensation of steam through the garments, and then heating the chamber to a temperature of the order of 250*F to complete the crosslinking operation. Next, the garments may be freed of residual odors by flushing the chamber with fresh air and/or steam. The apparatus comprises an openable treating chamber adapted to be heated as by steam ducts and having therein a heated tray for receiving paraformaldehyde and vaporizing the same. Also, means are provided for introducing controlled amounts of steam and of sulphur dioxide as the catalyzing agent. The chamber has suitable ports enabling it to be flushed by fresh air and by steam.

Inventors

  • 👤 George Louis Payet
  • 👤 John H Forg

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-01 22:09
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/10; D06M13/12; D06M13/127

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 35 words
The method set forth in claim 1 including the step of circulating air and/or steam through said chamber after the chamber reaches said 250* F. temperature whereby to rid the fabric articles of residual odors.
Claim 2
Dependent Claim 36 words
The method set forth in claim 1 wherein the amount of sulphur dioxide gas provided in said chamber is from 0.1 percent to 2 percent by volume of the gases in said chamber at atmospheric pressure.
Claim 3
Dependent Claim 35 words
The method set forth in claim 1 wherein the amount of formaldehyde gas provided in said chamber is from 2 percent to 10 percent by volume of the gases in said chamber at atmospheric pressure.
Claim 4
Independent Claim 107 words
The method of producing a durable press in a fabRic article which contains cellulosic material and has been pressed, creased or finished as desired, which comprises placing said fabric article in a closed chamber, providing formaldehyde and sulphur dioxide gases in said chamber and providing simultaneously steam in said chamber causing the temperature in the chamber to rise and said fabric article to be permeated with moisture, cutting off the steam and allowing the temperature in said chamber to drop and cause greater condensation of steam in said fabric article, and then heating the atmosphere in said chamber to a temperature of the order of 250* F.
Claim 5
Dependent Claim 18 words
The method set forth in claim 5 wherein the temperature in said chamber is initially at room temperature.
Claim 6
Dependent Claim 17 words
The method set forth in claim 5 wherein said heating is effected indirectly through the chamber walls.
Claim 7
Dependent Claim 16 words
The method set forth in claim 5 wherein said heating is effected directly in the chamber.
Claim 8
Independent Claim 144 words
A method of treating garments or other fabric articles made of cellulosic or part-cellulosic materials pre-pressed, creased or finished as desired, comprising placing said garments or other fabric articles in chamber wherein the temperature is 150* F. or below, closing said chamber, introducing steam therein to impart a predetermined moisture content to said garments or other fabric articles, concurrently introducing a predetermined amount of sulphur dioxide and a predetermined amount of formaldehyde gas by vaporizing paraformaldehyde in said chamber, cutting off the steam and allowing the temperature to drop by a predetermined amount to cause greater condensation of steam in said garments or other fabric articles, and next applying dry heat to raise the temperature in said chamber to about 250* F. whereby wrinkle-resistant, press-free properties are imparted to said garments or other fabric articles by a crosslinking reaction in the cellulosic material thereof.

References Cited (Backward Citations)

GB437642A Cited
US2311080A Cited
US2441859A Cited
GB980980A Cited
US3264054A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-05-02 1975-11-01 1976-05-02 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-05-02 1979-11-01 1980-05-02 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-05-02 1983-11-01 1984-05-02 $7700.00 Window Closed / Lapsed

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