Comments on Other's Voices incl. Published Items.

Last Updated: 25^th April 2000

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• Publication of L. Sanchez and J.R. Sanchez on "Precautions using direct dyes" in the REVISTA DE LA INDUSTRIA TEXTIL/Spain - VOL. 369, (1999) , Nr 6, pag. 38 - 49

A very interesting content on a subject apparently out of consideration, but with a very real actuality. In the actual time, it seams that cotton "can only be dyed with reactiv dyes". A lot of dye houses I am normally involved, have used ONLY reactiv dyes in the past. The dyeing culture for other dyes on cotton has been complete lost. I was very well impressed from the fact that this subject has been presented by people in charge of industrial dye houses, with practical experience and facing every day the requirements of the market.

In the dye houses where they have "re-invented" the cotton dyeing with direct dyes for pale and medium shades, it was absolutelly necessary to intorduce a very different way of thinking and looking in which cases direct dyes can be from interes and which kind of direct dyes. The fact has been again:

• old way: use direct colors with good leveling propierties. But the fastnesses are so poor, the color reproducibility so difficult (rest exhaustion during cooling), the migration during draying produces such problems, the aftertreatments changes the color, etc.
• new way: use direct colors with good fastnesses, no "after-exhaustion" by cooling down, very good color reproducibility (including lab to plant and plant to plant), but difficult to level. They are salt sensitive…

Our strategy "the lot has to be level from the beginning" using controlled adsorption is the real answer to this problem. Salt sensitivity has to be understood as: excellent control of the rate of exhaustion using electrolite.

Additionally to the presentation in the mentioned paper, the CARBOTEX software for evaluation of exhaustion curves and prediction of production parameters is used very succesfully this concern. The complementary support is the lab methods used as basis allowing a correct evaluation.
 
 

•  Publication of Prof. Dr. Joachim Hilden on "Machinery for optimized dyeing processes" and "Automatic Colour Kitchen Dispensing and Metering Equipment" in the INTERNATIONAL TEXTILE BULLETIN - (1999) , Nr 4, pag. 77 - 80 and 92 - 94

Independing of the very objective description of the real news in the ITMA, I would like to recommend to read with big attention and to try to deduct all the consequences of his statement on the page 80, under "A glimpse of the future". Some of you know my asestment "It is not enough to buy the best Stradivarius, it is absolutelly necessary also to learn to play the violon". In the decription of Prof. Hilden: he os now speaking about the neead to form and educate excellent "orchester-conductors"… I can agree!

• Publication of Prof. Dr. Jose Cegarra, F. Enrich Gregori, M. Pepió and Publio Puente on "Modelizacion de la tintura por integracion de un empaquetado de lana con colorantes acidos" in the REVISTA DE QUIMICA TEXTIL Vol. 145, (1999), Nr 4, pag. 55-63

Controlling the "offer" for a given "demand", insteat of controlling the "demand" for enough big "offers". A big confussion trying to tell things different avoiding to accept concepts very well introduced in the industrial production. It could be called: "A 'me too' product".

• Publication of Hertwig HOECKER, K. SCHAEFER and GIESSMANN on " Faerben aus überkritischem CO2 von Wolle und Polyester/Wolle-Mischungen" in the TEXTIL-VEREDLUNG (TEXTILVEREDLUNG) Vol. 34, (1999), Nr 6, pag. 12-19

The titel don't corresponds to the content, because in can not be called "dyeing" a staining of wool with "water non-soluble, CO2-soluble Dyes" I will like to propose to call it: "Anschmützen aus….". Every body involved in the dyeing von Wool/PES Blends know very well that the "water unsoluble dyes (a good example are disperse dyes) stain the wool in a very different color as on PES and don't present any acceptable fastness". It is also well known, that some kind of lether could also be dyed with these class of dyes, with all the corresponding precautions and limits. We will wait till the money invest in this project can be returned in the sense of "profitable investiment for research purposes".

The more valid sentence in this publication: "For this method, only CO2-soluble dyes can be used".

• Publication of WALLACE Michele L., BECK Keith R. and SMITH C.Brent, NCSU On "On-line Monitoring of Reactive Batch Dyeing Exhaustion and Hydro-lisis by FIA-HPLC" in the TEXTILE CHEMIST & COLOR. & AMER.DYES.REP Vol. 32, (2000), Nr 2, pag. 39-42

Very interesting the way to chack during a dyeing the quantity of exhausted dye and specially of hydrolized dye. It would be very interesting to become more information about the improvements achieved using this strategy concerning reproducibility of shades from lab to production, from lot to lot in the production. Influence of the liquor ratio if the load of a given machine changes according to the markat requirements?

• Publication of SHAMEY M.R. and NOBBS J.H., Univ. of Leeds
  on " The Application of Feedforward Profiles in the Control of Dyeing Machinery" in the TEXTILE CHEMIST & COLOR. & AMER.DYES.REP Vol. 32, (2000), Nr 2, pag. 47-52

Splendid theoretical work, where the biggest question is: how we know the profile to be used in any practical case? Which is the influence of the dye compatibility in the choice of the most interesting profile? Remain the profiles constant and independant of the additional dyes and auxiliaries in the recipe? Why the profile has to be related to a given dyeing machine (the profile is a function of time and, consequently, not usefull for any dyeing machine).

• Publication "El Proceso de Poliamida S: Una contribucion a la tintura actual de la poliamida " in the REVISTA DE LA INDUSTRIA TEXTIL/Spain - VOL. 146, (2000) , Nr 1, pag. 28 - 46

How can be published something like that in year 2000? It remembers the "magic recommendations" of the old patten cards, with some additions (Made by Dr. Hoffmann ?) related to the determination of fiber affinity, direct deduced from the very well know recommendations (also from Dyestar, formals Bayer) for Polyesther Fibers. Poor, complicated and no mention at all of the magnific possibilities from the progressive dosing of acid (see also my Bibliography, together with Dr. Annen and Mr. Engeler, TEXTIL-VEREDLUNG - VOL. 15, (1980) , Nr 8, pag. 296-302!). Dyestar has promoted in the last time processes based on dosing (ph-Programming) together with THIES. CIBA has promoted in the middel of seventies together with Polymetrom a similar device specially recommended for the dyeing of polyamide carpets. They have problems? We are working with THEN, COMEUREG, E.A.S. with very precise data concerning acid dosing during heating (going out from Teintolab trials) since a lot of years with Companies like DOGI, RÖKONA, etc. But Dyestar don't like to follow this way… and CIBA neither! Is it that a help to our european Textile-Industry?

• Publication of FARIAS Leonard T., The Cotton Inc., Raleigh on "Color Retention and Crease Edge Abrasion in Winkle-Resistant Cotton Slacks" in the TEXTILE CHEMIST & COLOR. & AMER.DYES.REP Vol. 32, (2000), Nr 3, pag. 22-25

Nothing absolutely new, but very well presented and with practical recommendations. The comparation between continuous and bulk dyeing methods, specially concerning penetration of dyeing has to be repeated again and again. In some cases, other authors claim the higher yeld of the continuous dyeing: that is very often a sign of poor penetration!

• Publication of TSUI William, Hong-Kong on "Progress in package dyeing" in the INTERNATIONAL DYER & TEXT. PRINTER (2000), Nr 1, pag. 23-29