US3617200A - Controlling the wash liquid temperature while preparing parchmentised webs - Google Patents

Controlling the wash liquid temperature while preparing parchmentised webs Download PDF

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Publication number
US3617200A
US3617200A US760760A US3617200DA US3617200A US 3617200 A US3617200 A US 3617200A US 760760 A US760760 A US 760760A US 3617200D A US3617200D A US 3617200DA US 3617200 A US3617200 A US 3617200A
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Prior art keywords
washing liquid
washing
bath
wash bath
liquid
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Expired - Lifetime
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US760760A
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English (en)
Inventor
Peter John Gilder
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Arjo Wiggins Ltd
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Wiggins Teape Research and Development Ltd
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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
    • D06B1/00—Applying liquids, gases or vapours onto textile materials to effect treatment, e.g. washing, dyeing, bleaching, sizing or impregnating
    • D06B1/02—Applying liquids, gases or vapours onto textile materials to effect treatment, e.g. washing, dyeing, bleaching, sizing or impregnating by spraying or projecting

Definitions

  • This invention relates to a method of preparing parchmentized fibrous webs, which usually are those made on a papermaking machine particularly for the production. of vegetable parchment or vulcanized fiber but which may be nonwoven webs or webs woven by textile processes.
  • the constituent fibers are primarily natural cellulose from vegetable materials including wood or cotton, regenerated cellulose, orsynthetic polymers, or mixtures of such materials.
  • parchmentizing is usually effected by passing the web of raw material through a parchmentizing.
  • liquid which usually is sulfuric acid but which may be any of the acid, neutral or alkaline liquids known to parchmentize at suitable times, concentrations, and temperatures.
  • the washing is usually effected by a series of successive baths containing the washing liquid and pairs of press rollers are located between the baths to draw the web and reduce the quantity of liquid carried from one bath to the next by the web.
  • the washing baths are usually operated according tothe countercurrent flow principle tov concentrate the liquid for subsequent recovery and reuse.
  • the first washingbath therefore contains the most concentrated liquid and also contains dispersed and dissolved material lost from the web and which causes material known as black amorphous scale duringrecovery by evaporation, and the discoloring of the recovered acid. This scale is difficult and costly to remove.
  • All the chemical substances used to produce parchmentizing generate heat on dilution and the temperature of the washing liquid at the first washing position if not controlled,.depends on the volume, the temperature, and the concentration of liquid carried by the web from the parchmentizing bath, as well as the temperature, the flow rate, and concentration of the washing liquid. Since the ambient conditions, the linear speed and basis weight of the web will also produce effects, the temperature of the washing liquid at the first washing position may vary considerably, the temperature and variationsv thereof increasing as the linear speed of the web is increased.
  • a method of preparing a parchmentized fibrous web in which the web is drawn from a parchmentizing bath. and is passed to successive I washing positions, characterized by the step of maintaining the temperature of the washing liquid applied to the webat the first washing position at a substantially constant level,
  • the properties of the product may be varied. Further advantages are reduced" cost by operation at a higher linear speedof the web without loss of product quality due to reduction of material lost at the first washing position, to fewer breaks in the web during the process, and to increased efficiency in acid recovery due to the formation of less black amorphous scale.
  • an oxidizing agent such as potassium permanganate or nitric acid
  • a further advantage of the invention is that less of such an agent is required than is the case with the previously known parchmentizing processes.
  • the first washing position is a bath containing the washing liquid
  • the web is passed through the washing liquid
  • the temperature of the washing liquid is maintained at the substantially constant level by thermostatically controlled heat exchange means immersed in the washing liquid in the bath.
  • the first washing position is a bath containing the washing liquid, and washing liquid is extracted from the bath and is recirculated to the bath, andthe temperature of the washing liquid ismaintained at the substantially constant level by washing liquid recirculated to the bath through thermostatically controlled heat exchange means.
  • the washing liquid may be caused to flow to the bath at the first washing position from a second bath at a second washing position and the temperature of the washing liquid in the bath at the first washing positionis maintained at the substantially constant level by thermostatically controlled heat exchange means immersed inthe liquid in the second bath.
  • the washing liquid may be caused to flow to the bath at the first washing position from a second bath at a second washing position and the temperature of the washing liquid in the bath at the first washing positionis maintained at the substantially constant level by thermostatically controlled heat exchange means immersed inthe liquid in the second bath.
  • thermostatically controlled heat exchange means located at a position betweenthe position at which the liquid leaves the second bath and the position at which it enters the bath at the first washing position.
  • the method may include the step of agitating the washing liquid in the bath at the first washing position to equalize the temperature of the washing liquid in the bath.
  • the washing liquid is applied to the web by spraying means at the first washing position, the washing liquidisdelivered to the spraying means from a collecting trough at a second washing position, and the temperature of the washing liquid applied to the spraying means is maintained at the substantially constant level by thermostatically controlled heat exchange means immersed in the liquid in the collecting trough.
  • the washing liquid is applied to the web by spraying means at the first washing position, the washing liquid is delivered to the spray ing means from a collecting trough at a second washing position, and the temperature of the washing liquid applied to the spraying means is maintained at the substantially constant Ievel'by thermostatically controlled heat exchange meansv at a positionbetween the position at which the liquid leaves the collecting troughand the spraying position for thefirst wash ing position.
  • the temperature of the washing liquid at the-first washing position may-bemaintained at a substantially constant level of the order of 15 C.
  • FIGS. 1 to 6 in plan views, diagrammatically illustrate methods according ,to the invention.
  • a parchmentized fibrous web I is drawn from a parchmentizing bath 2 and is passed around rollers, not shown, to successive first and second washing positions 3,4.
  • the first washing position is a bath containing the washing liquid and the web 1, in known. manner, has washing liquid applied thereto by passing the web through the washing liquid.
  • the first washing position is a bath containing the washing liquid and the web 1, in known. manner, has washing liquid applied thereto by passing the web through the washing liquid.
  • heat exchange means 7, and thermostat 8 may be of any suitable known kind and per se form no part of the present invention.
  • the heat exchange means may consist of a submerged coil of suitable material through which a heated or a cooled fluid is passed.
  • the washing liquid is extracted from the first bath 3 and is recirculated to the bath 3, as diagrammatically shown at 9, and the temperature of the liquid in the bath 3 is maintained at a substantially constant level by the entry into the bath of liquid treated by the heat exchange means 7 under control of the thermostat 8.
  • the method illustrated in FIG. 3 is similar to that illustrated in FIG. I but differs therefrom in that the heat exchange means 7 is immersed in the bath at the second washing position.
  • the method illustrated in FIG. 4 is similar to that of FIG. 3 but differs therefrom in that the heat exchange means 7 is located at a position between the position at which the liquid leaves the bath of the second washing position and that at which it enters the bath at the first washing position.
  • controlling heat exchange means 7 instead of being at the position shown in FIGS. 1 and 2 may be located in line 5, as indicated in FIG. 4, and there may be effected by a jacket, not shown, which surrounds a pipe carrying the liquid from the second to the first washing positions and through which heated or cooled fluid is passed.
  • the bath at the first washing position may include stirring devices, or other means, not shown, of agitating the washing liquid in the bath to equalize the temperature of the washing liquid in the bath.
  • FIG. 5 diagrammatically illustrates an alternative method according to the invention whereby the washing liquid at the first washing position 3 is applied to the web by being sprayed on to the web 1 by a spraying device 10.
  • the washing liquid flows, as indicated at 5, to the spraying device from a collecting trough at the second washing position 4 and the heat exchanger 7 is immersed in the liquid contained in the collecting trough at the second washing position and is controlled by the thermostat 8 in line 5.
  • the method illustrated in FIG. 6 is similar to that of FIG. 5 but differs therefrom in that the heat exchange means 7 is located at a position between the position at which the liquid leaves the collecting trough at the second washing position 4, and that at which it enters the spraying device 10.
  • the greatest advantage is obtained by the first l of cooling and the advantage is greater as the temperature increases.
  • a greater advantage is achieved by cooling from 40 to 30 C. than is obtained by cooling from 30 to 20 C.
  • the preferred temperature of the liquid in the first washing bath is +15 C. but it may be as low as l C.
  • the benefits of the invention increase with the machine speed because this increases the volume entering the first washing position and hence the temperature of the liquid in the first position.
  • the temperatures mentioned above are typical for web speeds of up to 50 to 120 meters per minute but the web speed may be up to 250 meters per minute.
  • Base paper consisting of 100 percent bleached sulfate wood pulp containing proportions of virgin pulp, 36 percent soft- Percentage Change Reduction in light scattering coefficient Increase in wet tensile strength Increase in dry tensile strength The temperature decrease also reduced the number of pinholes per square meter from 300 to zero and correspondingly increased the resistance to grease absorption.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Paper (AREA)
US760760A 1967-10-12 1968-09-19 Controlling the wash liquid temperature while preparing parchmentised webs Expired - Lifetime US3617200A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB46678/67A GB1190256A (en) 1967-10-12 1967-10-12 Method of Preparing Parchmentised Webs

Publications (1)

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US3617200A true US3617200A (en) 1971-11-02

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US760760A Expired - Lifetime US3617200A (en) 1967-10-12 1968-09-19 Controlling the wash liquid temperature while preparing parchmentised webs

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US (1) US3617200A (enExample)
DE (1) DE1801074A1 (enExample)
FR (1) FR1587819A (enExample)
GB (1) GB1190256A (enExample)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998006900A1 (en) * 1996-08-09 1998-02-19 The West Carrollton Parchment Company Decorative sheet and method of making the same
US6096258A (en) * 1998-01-20 2000-08-01 Viskase Corporation Method and apparatus for forming a cellulose article including solvent recovery means
WO2008084139A1 (en) * 2007-01-12 2008-07-17 Ahlstrom Corporation A method of forming a reinforced parchmented nonwoven product, and the product

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016205954A1 (de) * 2016-04-28 2017-11-02 Duale Hochschule Baden-Württemberg -Körperschaft Des Öffentlichen Rechts- Verfahren und Anlage zum Herstellen eines flächigen imprägnierten Faserstoffproduktes

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2008141A (en) * 1931-03-24 1935-07-16 Hollingsworth & Vose Co Insulating or "fish" paper and method of making
US2207122A (en) * 1937-08-25 1940-07-09 Kalamazoo Vegets Le Parchment Parchmentized paper

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2008141A (en) * 1931-03-24 1935-07-16 Hollingsworth & Vose Co Insulating or "fish" paper and method of making
US2207122A (en) * 1937-08-25 1940-07-09 Kalamazoo Vegets Le Parchment Parchmentized paper

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998006900A1 (en) * 1996-08-09 1998-02-19 The West Carrollton Parchment Company Decorative sheet and method of making the same
US6096258A (en) * 1998-01-20 2000-08-01 Viskase Corporation Method and apparatus for forming a cellulose article including solvent recovery means
WO2008084139A1 (en) * 2007-01-12 2008-07-17 Ahlstrom Corporation A method of forming a reinforced parchmented nonwoven product, and the product
JP2010515834A (ja) * 2007-01-12 2010-05-13 アールストロム コーポレイション 層状化沈殿不織生成物を形成する方法及びその生成物
US20100139877A1 (en) * 2007-01-12 2010-06-10 Michael Dennis Black Method of forming a reinforced parchmented nonwoven product, and the product
US8317977B2 (en) 2007-01-12 2012-11-27 Ahlstrom Corporation Methods of forming a reinforced parchmented nonwoven product

Also Published As

Publication number Publication date
GB1190256A (en) 1970-04-29
DE1801074A1 (de) 1969-08-14
FR1587819A (enExample) 1970-03-27

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