Heat and Mass Transfer During Steam Pressing of Wool Fabrics

Abstract

The temperature and humidity of steam and their effects on the absorption of moisture into wool fabrics during steam pressing are investigated. The temperature of buck steam in a steam press is greatly influenced by the temperature of the buck padding. The physics of heat and moisture transfer between the steam and the padding material is modeled to give predictions of the temperature and humidity of the steam entering the fabric. The calculated steam temperature confirms its dependence on the buck padding temperature, as does the steam relative humidity, which decreases steeply with prolonged steaming. A sharp increase in the fabric moisture content during the first few seconds of steaming is predicted by the model and confirmed by experimental measurements. Subsequent changes in moisture content as the fabric equilibrates to the steam condition will depend on the initial fabric regain and the steam condition. Variations in the temperature and humidity of steams between presses are explained as due mainly to the type and conditions of the padding. The model is also used to simulate vacuum cycles and can predict fabric temperature and regain during different cooling procedures.

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References

Baird K. , Temperature and Regain of Wool Fabrics in a Hoffman Press, report no. S.39 , CSIRO Division of Textile Physics, Ryde, Australia, 1964.

Baird, K. , Temperature and Moisture Regain of Wool Fabrics During Steam Pressing , Textile Res. J. 38, 670-674 (1968).

Biglia, U. , Roczniok, A.F. , Fassina, C. , and Ly, N.G. , The Prediction of Garment Appearance from Measured Fabric Properties , in "Textile Objective Measurement and Automation in Garment Manufacture ," ( G. Stylios , Ed.), Ellis Horwood, New York, 1991, pp. 175-187.

Dhingra, R.C. , and Postle, R. , Some Aspects of the Tailorability of Woven and Knitted Outerwear Fabrics, Clothing Res. J. 8 (2), 59-76 (1980).

Goodall, P.M. , The Efficient Use of Steam, IPC Business Press Limited , Surrey, England, 1980, p. 15.

Investigations of Fabric Shrinkage on the Hoffman Press, Wool Sci. Rev. no. 19, 33-45 (1961).

Jeffries, R. , The Sorption of Water by Cellulose and Eight Other Textile Polymers, J. Textile Inst. 51, T441-T457 (1960).

Kalecki, E.H. , Pharo, J.A. , Dorkin , C.M.C. , and Munden , D.L. , Some Factors Affecting the Degree of Set Achieved During Steam Pressing of All Wool Fabrics , Clothing Res. J. 2 (1), 11-27 (1974).

Kopke, V. , and Lindberg, J. , Steam Pressing of Wool Fabrics: The Influence of Temperature and Moisture Regain on the Efficiency of Pressing, J. Textile Inst. 57, T551 (1966).

10.

Le, C.V. , Ly, N.G. , and Postle, R. , Model for Heat and Mass Transfer Between a Wool Fibre Assembly and a Permeating Air Stream, in Proc. 9th Biennial Conference on Modelling and Simulation, Gold Coast, Queensland, Australia, 1991, pp. 472-477.

11.

Nordon, P. , A Model for Mass Transfer in Beds of Wool Fibres, Int. J. Heat Mass Trans. 7,639-651 (1964).

12.

Pharo, J.A. , and Munden, D.L. , An Investigation of the Performance of Wool/Polyester Blend Fabrics During Steam Pressing, Clothing Res. J. 6 (2), 39-60 (1978).

13.

Rosenblad-Wallin, E. , and Cednas, M. , Pressing of Seams and Creases , Clothing Res. J. 2 (3), 115-121 (1974).

14.

Watt, I.C. , and D'Arcy, R.L. , Water-Vapour Adsorption Isotherms of Wool, J. Textile Inst. 70, 298-307 (1979).

15.

Wilby, M.J. , Evaluating Steam Pressing, CTC Technology Review No. 5, July 1990.