US3567365A - Monitoring the wet processing of a material - Google Patents

Monitoring the wet processing of a material Download PDF

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Publication number
US3567365A
US3567365A US819165A US3567365DA US3567365A US 3567365 A US3567365 A US 3567365A US 819165 A US819165 A US 819165A US 3567365D A US3567365D A US 3567365DA US 3567365 A US3567365 A US 3567365A
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United States
Prior art keywords
liquid
liquor
nip
concentration
cloth
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Expired - Lifetime
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US819165A
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English (en)
Inventor
Geoffrey James Parish
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cotton Silk and Man Made Fibres Research Association
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Cotton Silk and Man Made Fibres Research Association
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
    • D06B23/00—Component parts, details, or accessories of apparatus or machines, specially adapted for the treating of textile materials, not restricted to a particular kind of apparatus, provided for in groups D06B1/00 - D06B21/00
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
    • D06B2700/00—Treating of textile materials, e.g. bleaching, dyeing, mercerising, impregnating, washing; Fulling of fabrics
    • D06B2700/36—Devices or methods for dyeing, washing or bleaching not otherwise provided for

Definitions

  • wet process is used herein to mean a process involving treatment with any liquid and is not intended to be restricted to processes where the liquid is water.
  • the wet process may be a continuous cleaning process of the kind wherein a travelling length of absorbent material particularly textile material is passed through a unit in which it is cleaned by treatment with a suitable liquid for the purpose of removing unwanted substances, hereinafter termed impurities whether such be dirt, or a chemical in the material from a previous treatment process.
  • a method for monitoring a continuous cleaning process of the kind referred to includes the steps of removing the bulk of the liquid retained by the material after leaving the cleaning unit by any suitable means, removing further liquid by any suitable means, collecting the liquid removed at said second means, and measuring the concentration of impurity therein.
  • the step of measuring the concentration of impurity in the liquid expressed at said second means may be performed either at intervals or continuously.
  • a signal dependent upon the measurement is obtained which is either fed back to the cleaning unit for the purpose of adjusting conditions therein whereby the cleaning process is controlled automatically or fed to another machine for the purpose of compensating for an undesired characteristic found in said measurement.
  • the principles of the invention are applicable not only to continuous cleaning processes as defined above, but also to wet processes where a liquid is applied to a continuously travelling length of material for the purpose of introducing an additive to the material which modifies the characteristics of the material, and where the modification is accompanied by a related change in the nature of the liquid content of the material subsequent to the application of the treatment liquid.
  • modification is to be understood as not including within its scope the mere extraction from the material of a substance. In the processes I presently have in mind there will be, for example, a chemical reaction causing the modification, or some change in, say, the concentration of a substance carried in liquid solution by the material.
  • a method of monitoring or controlling a wet process of the type described includes the steps of applying the treatment liquid to the material whilst travelling, later removing the bulk of liquid contained by the travelling material, and still later removing further liquid from the travelling material, collecting the last liquid, and by examining its nature, assessing the characteristics of the material with which the process is conceried.
  • a control signal will be produced, if, as a result of that assessment the characteristics are found not to be as required, and that control signal is used to cause a corrective variation in the applied liquid or in some other processing condition.
  • apparatus for carrying out such a process includes means for applying a treatment liquid to a material whilst travelling, means for later removing the bulk of liquid from the material, means for still later removing further liquid from the travelling material, means for collecting said further liquid, and means for continuously or intermittently examining the nature of said further liquid whereby the characteristics of the material with which the process is concerned may be assessed.
  • FIG. 1 shows, by way of example only, in diagrammatic form, one form of apparatus for practicing the invention in connection with a commercial washing process
  • FIG. 2 shows, by way of example only, in diagrammatic form, an apparatus used for a treatment following the mercerisation of a textile material in a continuous length.
  • Table I relates to cloth liquor and wash tank liquor, Table II cloth liquor and total nip liquor (that is the liquor from both nips) and Table III cloth liquor and second nip liquor after preliminary squeeze.
  • Table II show levels of liquor removal at the nip which are unsatisfactory and Table II shows some levels of removal at the second nip that are satisfactory.
  • the liquor squeezed out of the main or second nip is collected in a tray beneath the nip rolls. To prevent the liquor from running back down the cloth and not reaching this tray the cloth must approach the nip from a higher level.
  • the bulk of liquid may be removed from the material on leaving the cleaning unit by any suitable means, for example, by use of a nip, a suction means or a doctorblade or like means.
  • Further liquid may be removed by a nip or any other suitable means collected for measurement of the impurity therein, and such measurement may be effected at intervals or continuously.
  • a suitable signal may be produced and fed either back to the cleaning unit to adjust the treatment conditions therein whereby the cleaning process is controlled automatically, or fed to another machine for the purpose of compensating for an undesired characteristic found in said measurement.
  • a length of textile fabric F is passed through a conventional washing machine M in known manner.
  • the fabric leaving the machine passes through a first nip N comprised by a pair of bowls or rollers where the bulk of the liquor retained by the fabric is squeezed therefrom, collected and returned to the washing machine.
  • the fabric is then passed through a second nip N where further liquor is squeezed from same.
  • This further liquor is collected by a trough T and passed through a measuring instrument I which gives a continuous eiectrical output signal whose magnitude is proportional to the concentration of impurity in the liquor sensed by the instrument I.
  • This signal may be used either to control conditions in the washing machine M or to modify the conditions of a further processing of the fabric F as for example further washing machines in a washing range. It will be noted that the provision of guide rolls between the two nips ensures a time interval between the two squeezings enabling conditions on the fabric to tend towards an equilibrium before the second squeezing.
  • FIG. 2 Another embodiment of the invention will be described with reference to FIG. 2.
  • the fabric is rinsed on the merceriser, to remove the bulk of caustic soda, passed through an acid bath and rinsed again.
  • the material leaves the mercerising range in an acid condition and a separate operation is passed through a washing range, which consists, successively, of a rinse bath 10, a neutralizing bath 11, a second rinse bath 12, and a third rinse bath 13.
  • a washing range which consists, successively, of a rinse bath 10, a neutralizing bath 11, a second rinse bath 12, and a third rinse bath 13.
  • the fabric F passes through a nip 10a, 11a and 12a, respectively to prevent excess liquor from the baths being transferred from one bath to the next.
  • the fabric passes through a pair of squeeze nips 14 and 15.
  • the first nip 14 is removing the bulk of liquid from the cloth, and the second nip 15, for removing a continuous sample of further liquid as described above.
  • This sample passes via a collecting trough 16 to a conventional pH electrode 17.
  • the pH electrode 17 is fitted with a limit switch (not shown) which energises a control circuit C when the pH falls below the set point.
  • the control circuit C then operates the flow-control valve 18 to allow a pre-determined amount of alkali stock solution to enter the neutralizing tank 11 via conduit 19.
  • the required concentration of alkali in this tank 11 will depend on the acidity of the incoming fabric; a higher acidity will normally require a somewhat greater alkali concentration.
  • control arrangement ensures that the concentration reaches the value necessary to achieve the desired pH at the measuring point; i.e. in the liquor collected from the emerging fabric at the second squeeze nip.
  • the type of control circuit employed is not critical.
  • a limit switch and a sampled-data controller 20 are envisaged, but a conventional proportional or proportional/integral controller could be used.
  • an analogous control system could be used in the mercerising range itself to control the feed of acid so that the fabric comes off in a substantially neutral state.
  • a similar control could be applied where an added chemical reacts in some way with a substance present in or previously applied to the material; or in fact with the material itself, as for example, in the case of a bleaching process. It is only necessary that the extent of the reaction should be measurable in the liquor removed at the nip, for example by a continuous or semi-continuous titration process.
  • the procedure could also in principle be used to control the addition of a chemical without any chemical reaction, if the amount of this chemical were measurable in the nip liquor.
  • a reasonable application would be to a situation where the liquor on the fabric is difierent in concentration from the liquor in an impregnation tank (for example, because of water initially held by the fabric).
  • a method of monitoring a wet process of the kind wherein a travelling length of absorbent material has a treatment liquid applied to it comprising the steps of removing the bulk of the liquid carried by the material, thereafter removing further liquid carried by the material,
  • a method according to claim 1 comprising the further step of using said signal for control purposes.
  • a method according to claim 1 wherein the step of measuring some identifiable property of said further liquid is carried out at intervals.
  • step of measuring some identifiable property of said further liquid comprises contacting a pH electrode with said further liquid, said signal being produced by a variation in the pH of said further liquid from some predetermined set point.
  • a method according to claim 1 wherein the identifiable property measured is the difference in concentration of some substance in the further liquid and in the treatment liquid.
  • each of the bulk and further liquid is removed from the material by passing the latter between a pair of rotary cylindrical members.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Treatment Of Fiber Materials (AREA)
US819165A 1968-07-24 1969-04-25 Monitoring the wet processing of a material Expired - Lifetime US3567365A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3529668 1968-07-24

Publications (1)

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US3567365A true US3567365A (en) 1971-03-02

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US819165A Expired - Lifetime US3567365A (en) 1968-07-24 1969-04-25 Monitoring the wet processing of a material

Country Status (5)

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US (1) US3567365A (de)
CH (1) CH491681A (de)
DE (1) DE1937372A1 (de)
FR (1) FR2013599B1 (de)
NL (1) NL6905083A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040235407A1 (en) * 2003-05-25 2004-11-25 John Grunwald Fixed abrasive CMP pad with built-in additives
US20060079143A1 (en) * 2003-05-12 2006-04-13 Sage Products, Inc. Controlled dosing of fibrous materials
ES2602991A1 (es) * 2016-11-08 2017-02-23 Innovaciones Tecnológicas Industriales 2020 S.L. Maquinaria para blanqueo químico en continuo de tejido en cuerda

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992004719A1 (en) * 1990-08-29 1992-03-19 W.L. Gore & Associates, Inc. Polytetrafluoroethylene insulated multiconductor cable and its manufacture
US5245134A (en) * 1990-08-29 1993-09-14 W. L. Gore & Associates, Inc. Polytetrafluoroethylene multiconductor cable and process for manufacture thereof

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1089174A (en) * 1965-02-23 1967-11-01 Cotton Silk & Man Made Fibres Monitoring of a cleaning process

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060079143A1 (en) * 2003-05-12 2006-04-13 Sage Products, Inc. Controlled dosing of fibrous materials
US20040235407A1 (en) * 2003-05-25 2004-11-25 John Grunwald Fixed abrasive CMP pad with built-in additives
US6875097B2 (en) 2003-05-25 2005-04-05 J. G. Systems, Inc. Fixed abrasive CMP pad with built-in additives
ES2602991A1 (es) * 2016-11-08 2017-02-23 Innovaciones Tecnológicas Industriales 2020 S.L. Maquinaria para blanqueo químico en continuo de tejido en cuerda

Also Published As

Publication number Publication date
CH491681A (de) 1970-06-15
NL6905083A (de) 1970-01-27
FR2013599B1 (de) 1974-02-01
DE1937372A1 (de) 1970-06-11
FR2013599A1 (de) 1970-04-03

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