GB2284833A - Inhibiting the deposition of sticky particles on paper mill dryer fabrics - Google Patents
Inhibiting the deposition of sticky particles on paper mill dryer fabrics Download PDFInfo
- Publication number
- GB2284833A GB2284833A GB9322608A GB9322608A GB2284833A GB 2284833 A GB2284833 A GB 2284833A GB 9322608 A GB9322608 A GB 9322608A GB 9322608 A GB9322608 A GB 9322608A GB 2284833 A GB2284833 A GB 2284833A
- Authority
- GB
- United Kingdom
- Prior art keywords
- fabric
- sticky particles
- dryer
- utilisation
- paper
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/32—Washing wire-cloths or felts
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/30—Protecting wire-cloths from mechanical damage
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/02—Agents for preventing deposition on the paper mill equipment, e.g. pitch or slime control
Landscapes
- Paper (AREA)
Abstract
The deposition of sticky particles on dryer fabrics of paper-making machinery is inhibited by continuously applying to the fabric a sacrifial coating, suitably of cationic or amine active silicone fluids or of dimethyl siloxane emulsion. The particles adhere to the coating film and are subsequently removed therewith. <IMAGE>
Description
REOUEST FOR PATENT:
SUBJECT:
THE CONTROL OF THE DEPOSITION OF STICKY PARTICLES
ON PAPER MILL DRYER FABRICS
SUMMARY & OUTLINE OF THE INVENTION:
This invention relates to the control of the laydown and adhesion of sticky particles on dryer fabrics used in the industrial manufacture of paper and board.
The invention is designed to inhibit the laydown of these sticky particles on dryer fabrics by providing a continuous "sacrificial" hydrophobic coating to the fabric.
Detailed laboratory analysis (summary below) has confirmed that the provision of a hydrophobic coating to samples of the dryer fabric provides a film which has an affinity to attract the sticky particles. These particles can then be surrendered to a suitably designed removal device, thus protecting the fabric.
BACKGROUND:
Financial and environmental considerations in recent years have accentuated the use of waste and recycled paper in the manufacture of paper and board. These waste and recycled materials do, however, bring with them undesirable contaminants that can have a significant impact on the paper making process and on the paper machine and associated equipment.
Typically occurring contaminants include:
Latexes
Hot melt adhesives
Adhesive tape
Sticky labelling materials
As a result of their insolubility, these contaminants remain in the paper making process stream and are physically transported with the paper web. Their sticky nature, however, means that they are prone to deposit on hydrophobic surfaces such as the forming fabric, press felts and more significantly, as a result of the higher temperatures achieved, in the dryer section, on the dryer fabric.
IMPACT OF STICKY DEPOSITS ON DRYER FABRICS
The build up of sticky deposits on the dryer fabrics results in a number of operational and financial penalties for the paper manufacturer, including:
1 Loss.of porosity and drying capacity, resulting in the slowing down of
the machine and the consequent reduction in the paper or board production
rate.
2 Quality deterioration, as the sticky materials "pick" holes in the paper
sheet resulting in problems downstream, both in off-grade finished
product and in problems in subsequent coating processes.
3 The build up of sticky materials necessitates the shutdown of the paper
machine for cleaning of the fabric and/or replacement. "Off-line" cleaning
of fabrics is generally carried out using Sodium or Potassium Hydroxide
and solvent based cleaning chemicals which can be both costly and
hazardous in use and disposal.
4 Loss of drying capacity results in increased energy consumption as
steam utilisation is increased to provide additional heat for drying the
paper or board
DETAILS OF THE INVENTION:
The invention comprises a chemical additive programme and the equipment and methodology of application to and removal from the dryer fabric.
The technology utilised to inhibit the adhesion of the sticky particles is to apply a thin
hydrophobic film of silicone based fluid to the surface of the fabric which is in contact with
the paper sheet, just prior to the point of contact of the fabric with the paper sheet.
As the sticky particles melt and adhere to the fabric during the pass over the drying cylinders,
they become bonded to the silicone film. During the next circuit of the fabric around the
cylinders, the silicone film and the associated sticky particles are removed from the fabric to
waste.
The schematic of the applicator and removal system is shown in figure No.l.
Initial work on this subject has centred on the use of silicone fluids, particularly cationic,
amine active and polydimethyl siloxane emulsions. Excellent inhibition of sticky particle
deposition and adhesion has been achieved with each of these materials.
LABORATORY EVALUATION AND ANALYSIS:
A piece of dryer fabric was cut into a number of equally sized and shaped test pieces. These
test specimens were then utilised in evaluations using silicone fluids, as outlined above, made
up to 1 percent solutions using tap water
Four separate beakers were prepared and numbered 1 - 4. No.l contained tap water as a blank
reference, No.2 contained cationic silicone fluid, No.3 contained amine active silicone fluid
and No.4 contained dimethyl siloxane emulsion.
Samples of the dryer fabric were placed in each of the beakers for a period of 30 seconds, they
were then removed drained and shaken dry for a period of 20 seconds.
(r ri) Test pieces of two-sided "Nitto'Ztåpe)were stuck onto each specimen piece of the dryer fabric
and they were then placed m in oven at 95 degrees centigrade for a period of 15 minutes.
When the specimens were removed from the oven the "Nitto" tape was peeled off and a
qualitative assessment of the amount of sticky material left adhering to the fabric was made.
The results indicated that a significant amount of adhesive remained on the blank test
specimen whereas the treated specimens showed little or no remaining adhesive. The order of
cleanliness was:
Cleanest: No.3
Second: No.1 Third No.2
This same procedure was repeated using paper backed adhesive tape and reel splicing tape, the
results were as follows:
Paper-backed adhesive tape. Reel splicing tape.
Cleanest No.3 No.3
Second No.1 No.2
Third No.2 No. 1 PRELIMTNARY CONCLUSIONS:
1 The quantity of sticky materials left adhering to the dryer fabric samples decreased
significantly with the use of the additives.
2 Additive No.3 was consistently the best performer under the conditions of this test.
SECONDARY EVALUATIONS:
In order to quantify the reduction in the adhesion of the sticky particles to the dryer fabric, a .modified tensile test was carried out.
PROCEDURE:
Fresh pieces of dryer fabric were cut into strips 1 snug wide and 120mm long for use on the
standard tensile tester. These strips were paired off and soaked in the solutions as above.
They were then dried in the oven at 95 degrees centigrade for a period of 15 minutes,
simulating the contact of the fabric with the drying cylinders prior to contact with the paper
sheet.
The pairs of treated fabrics and the untreated blank pair were removed from the oven and joined together using two-sided adhesive tape. Each joined pair was then pressedusing a
standard laboratory hand press for 1 minute to ensure uniformity of adhesion.
Each sample pair was then subjected to the standard tensile test to ascertain the pressure
required to separate the joined samples. The following table shows the pressure, in psi.,
needed to separate the joined pieces of fabric.
SAMPLE: PRESSURE:
BLANK 40 psi.
No.l 8.6psi.
No.2 8.4 psi
No.3 2.9 psi
CONCLUSIONS:
As can be seen, the pressure required to separate all of the treated samples was significantly
lower than in the untreated case.
Additive No. 3 was again the most effective on an equivalent dose rate basis.
Claims (4)
1 A programme of inhibiting the laydown and adherence of sticky particles on dryer fabrics used in the industrial manufacture of paper and board.
2 The utilisation of a continuously applied hydrophobic layer to a dryer fabric such that sticky particles adhere to this layer rather that to the dryer fabric itself.
3 The utilisation of cationic and amine active silicone fluids and of dimethyl siloxane emulsion to provide this hydrophobic layer to the dryer fabric.
4 The utilisation of a continuous "mist applicator" of the fluid required to provide the hydrophobic layer to the fabric along with a device as shown in figure 1 to remove the sticky particles prior to the subsequent addition of the fluid.
4 The utilisation of a continuous applicator of the fluid required to provide the hydrophobic layer to the fabric along with a device as shown in figure 1. to remove the sticky particles prior to the subsequent addition of the fluid.
Amendments to the claims have been filed as follows 1 An "on-line", continuous method of inhibiting the laydown and adherence of sticky particles on dryer fabrics used in the industrial manufacture of paper and board.
2 The utilisation of a continuously applied, silicone based, hydrophobic layer to a dryer fabric, such that sticky particles adhere to this layer rather that to the dryer fabric itself.
3 The utilisation of either cationic, amine active silicone fluids, or of dimethyl siloxane emulsion to provide this hydrophobic layer to the dryer fabric.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9322608A GB2284833A (en) | 1993-11-02 | 1993-11-02 | Inhibiting the deposition of sticky particles on paper mill dryer fabrics |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9322608A GB2284833A (en) | 1993-11-02 | 1993-11-02 | Inhibiting the deposition of sticky particles on paper mill dryer fabrics |
Publications (2)
Publication Number | Publication Date |
---|---|
GB9322608D0 GB9322608D0 (en) | 1993-12-22 |
GB2284833A true GB2284833A (en) | 1995-06-21 |
Family
ID=10744535
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9322608A Withdrawn GB2284833A (en) | 1993-11-02 | 1993-11-02 | Inhibiting the deposition of sticky particles on paper mill dryer fabrics |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2284833A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000019009A1 (en) | 1998-09-25 | 2000-04-06 | Maintech Co., Ltd. | Pollution prevention method for canvas used in paper machine |
WO2001025535A1 (en) * | 1999-10-05 | 2001-04-12 | Hercules Incorporated | Method for paper machine cleanliness |
WO2001029312A1 (en) * | 1999-10-15 | 2001-04-26 | Hercules Incorporated | Process combining functional additives and dryer section passivation |
WO2003060230A1 (en) * | 2002-01-11 | 2003-07-24 | Maintech Co., Ltd. | Anti-staining agent for paper machine, and method for preventing stains using the same |
WO2004059077A1 (en) * | 2002-12-26 | 2004-07-15 | Maintech Co., Ltd. | Method for providing canvas of paper-making machine with anti-staining agent through sprinkling, and sliding sprinkle device and anti-staining agent for use therein |
EP1900872A1 (en) * | 2006-09-13 | 2008-03-19 | Voith Patent GmbH | Method for keeping a band clean |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB659784A (en) * | 1948-02-26 | 1951-10-24 | Hellefors Bruks Aktiebolag | Method of preventing resin from depositing on wire-cloths and the like in the production of paper and cardboard |
GB977094A (en) * | 1961-12-22 | 1964-12-02 | Nalco Chemical Co | Method of improving the operational efficiency of a fourdrinier papermaking machine |
US4861429A (en) * | 1988-07-29 | 1989-08-29 | Betz Laboratories, Inc. | Process for inhibiting white pitch deposition in papermaking felts |
EP0359590A2 (en) * | 1988-09-16 | 1990-03-21 | Grace Dearborn Inc. | Controlling deposits on paper machine felts and the like |
GB2251868A (en) * | 1990-12-24 | 1992-07-22 | Grace W R & Co | Pitch control in paper-making |
EP0550230A1 (en) * | 1992-01-02 | 1993-07-07 | Betz Europe, Inc. | Felt conditioning |
EP0551970A1 (en) * | 1992-01-13 | 1993-07-21 | Grace Dearborn Inc. | Pitch control |
-
1993
- 1993-11-02 GB GB9322608A patent/GB2284833A/en not_active Withdrawn
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB659784A (en) * | 1948-02-26 | 1951-10-24 | Hellefors Bruks Aktiebolag | Method of preventing resin from depositing on wire-cloths and the like in the production of paper and cardboard |
GB977094A (en) * | 1961-12-22 | 1964-12-02 | Nalco Chemical Co | Method of improving the operational efficiency of a fourdrinier papermaking machine |
US4861429A (en) * | 1988-07-29 | 1989-08-29 | Betz Laboratories, Inc. | Process for inhibiting white pitch deposition in papermaking felts |
EP0359590A2 (en) * | 1988-09-16 | 1990-03-21 | Grace Dearborn Inc. | Controlling deposits on paper machine felts and the like |
GB2251868A (en) * | 1990-12-24 | 1992-07-22 | Grace W R & Co | Pitch control in paper-making |
EP0550230A1 (en) * | 1992-01-02 | 1993-07-07 | Betz Europe, Inc. | Felt conditioning |
EP0551970A1 (en) * | 1992-01-13 | 1993-07-21 | Grace Dearborn Inc. | Pitch control |
Non-Patent Citations (1)
Title |
---|
WPI Abstract Accession No.82-03394J/48 &JP570171790 * |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000019009A1 (en) | 1998-09-25 | 2000-04-06 | Maintech Co., Ltd. | Pollution prevention method for canvas used in paper machine |
KR100388539B1 (en) * | 1998-09-25 | 2003-06-25 | 가부시키가이샤 멘테크 | Pollution prevention method for canvas used in paper machine |
US7323086B1 (en) | 1998-09-25 | 2008-01-29 | Maintech Co., Ltd. | Pollution prevention method for canvas used in paper machine |
WO2001025535A1 (en) * | 1999-10-05 | 2001-04-12 | Hercules Incorporated | Method for paper machine cleanliness |
WO2001029312A1 (en) * | 1999-10-15 | 2001-04-26 | Hercules Incorporated | Process combining functional additives and dryer section passivation |
WO2003060230A1 (en) * | 2002-01-11 | 2003-07-24 | Maintech Co., Ltd. | Anti-staining agent for paper machine, and method for preventing stains using the same |
CN1304688C (en) * | 2002-01-11 | 2007-03-14 | 曼泰克株式会社 | Anti-staining agent for paper machine, and method for preventing stains using the same |
AU2002367048B2 (en) * | 2002-01-11 | 2008-06-05 | Maintech Co., Ltd. | Anti-staining agent for paper machine, and method for preventing stains using the same |
US7585393B2 (en) | 2002-01-11 | 2009-09-08 | Maintech Co., Ltd. | Anti-staining agent for paper machine, and method for preventing stains using the same |
WO2004059077A1 (en) * | 2002-12-26 | 2004-07-15 | Maintech Co., Ltd. | Method for providing canvas of paper-making machine with anti-staining agent through sprinkling, and sliding sprinkle device and anti-staining agent for use therein |
EP1900872A1 (en) * | 2006-09-13 | 2008-03-19 | Voith Patent GmbH | Method for keeping a band clean |
Also Published As
Publication number | Publication date |
---|---|
GB9322608D0 (en) | 1993-12-22 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |