Measuring and testing – Sheet – woven fabric or fiber
Patent
1994-04-26
1997-06-10
Cuchlinski, Jr., William A.
Measuring and testing
Sheet, woven fabric or fiber
374 51, G01N 2500, D06H 308
Patent
active
056365462
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The object of the invention is a method and an installation for the evaluation of the sticking character of fibrous plant materials such as cottons; the invention is also aimed at the use of this method and of this installation for carrying out, under the best conditions, successive operations in the treatment of fibrous materials contaminated in this way.
DESCRIPTION OF RELEVANT ART
For some years, fibrous plant materials, and particularly cottons of various origins, have produced a sticking effect during spinning, which has led to considerable losses of productivity.
The sticking is principally related to insect secretions known as "honey-dews", consisting mainly of sugar and giving cotton a sticking power.
In order to solve this problem, several methods have been proposed to determine and eliminate the honey-dews or their sticking action.
In particular, the applicant has designed a machine which, by examining a sample held at a precise hygrometric state and pressed between two suitably heated aluminium sheets, makes it possible to determine the sticking potential of the sample under examination.
This machine has the disadvantage that the procedure is relatively tricky to implement, takes a long time, is expensive and that, in addition, determination of the degree of sticking of the sample is still in the end very subjective and can vary considerably from one operator to another.
The object of the invention is to overcome these difficulties by allowing an accurate, rapid and economic evaluation of the sticking character of the fibrous material particularly through an improvement in the method and the machine that has just been described.
The method in accordance with the invention is characterised by the following successive steps: a large surface area in relation to its weight, plate for several seconds using a pressing and heating unit, several seconds, air, determining the sticking character of the sample brought to its spread-out area.
With advantage, a start is made from a sample of several grammes, for example with a weight of between 2 and 5 grammes, which is opened out over an area of several hundred cm.sup.2, for example of the order of 200 cm.sup.2. When proceeding in this way, it is observed that, all other things being equal, the number of honey-dew spots counted is independent of the weight of the sample, which therefore need not be accurately weighed, whereas it is easy to open it out over a given area, for example of 17.times.12 cm or about 200 cm.sup.2.
With advantage, the heating is carried out at a temperature of between 33.degree. and 140.degree. C., preferably between 50.degree. and 90.degree. C.
The hot pressure may be maintained for several seconds and will be of the order of at least 40 g/cm.sup.2, very satisfactory results being obtained with a pressure of between 80 g/cm.sup.2 and 500 g/cm.sup.2.
The lower the temperature, the higher the pressure and the longer this pressure will be maintained.
For example, excellent results are obtained with the following parameters: pressure is maintained: 30 seconds, pressure is maintained: 5 seconds.
The cold pressure may be maintained for about 15 to 30 seconds, the pressure being of the same order of magnitude as that used for the hot pressure.
The method of the invention thus makes it possible in a very short space of time, less than 2 minutes, to determine accurately the sticking character of a cotton contaminated by honey-dews; an almost instantaneous knowledge of the sticking power of the cotton then makes it possible to determine without delay, and immediately to adapt, the treatment operations which are most appropriate for this cotton.
In particular, it is possible from a knowledge of this sticking power of the cotton to control an installation for a decontamination treatment of the same cotton.
In the same way, it is possible, from a knowledge of the sticking power of the cotton, to determine what type of spinning might possibly be implemented without a major disadvantage.
The invention is also aimed at in
REFERENCES:
patent: 3451756 (1969-06-01), Young
patent: 4624915 (1986-11-01), Schindler
patent: 4839943 (1989-06-01), Leifeld
patent: 4896400 (1990-01-01), Polli
patent: 5003670 (1991-04-01), Waeber et al.
patent: 5048156 (1991-09-01), Waeber et al.
patent: 5130559 (1992-07-01), Leifeld et al.
"Operating Instructions for SCT Honey-dew Testing Device GRAF/IRCT" Feb. 1992, Graf & Co. Ltd. Card Clothing and Machinery Manufactures.
Frydrych, R., "Determination du potentiel de collage des cotons par thermodetection", Cot. Fib.Trop., 1986, vol. XLI, fasc. 3.
Frydrych, Richard, "LA Thermodetection", Academie De Montpellier, Apr. 29, 1987, pp. 37-40, 49, 53-62.
Centre International de Recherche Agronomique pour le Developpem
Cuchlinski Jr. William A.
Worth Willie Morris
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