WO1998027277A1 - Papermakers felts - Google Patents

Papermakers felts Download PDF

Info

Publication number
WO1998027277A1
WO1998027277A1 PCT/GB1997/003186 GB9703186W WO9827277A1 WO 1998027277 A1 WO1998027277 A1 WO 1998027277A1 GB 9703186 W GB9703186 W GB 9703186W WO 9827277 A1 WO9827277 A1 WO 9827277A1
Authority
WO
WIPO (PCT)
Prior art keywords
batt
fibres
making
fabric
ultrasonic energy
Prior art date
Application number
PCT/GB1997/003186
Other languages
French (fr)
Inventor
Ian Alistair Whittaker
Colin Marks
Original Assignee
Scapa Group Plc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from GBGB9626153.2A external-priority patent/GB9626153D0/en
Priority claimed from GBGB9713595.8A external-priority patent/GB9713595D0/en
Application filed by Scapa Group Plc filed Critical Scapa Group Plc
Priority to GB9913006A priority Critical patent/GB2334536A/en
Priority to AU50605/98A priority patent/AU5060598A/en
Publication of WO1998027277A1 publication Critical patent/WO1998027277A1/en

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
    • H01L25/50—Multistep manufacturing processes of assemblies consisting of devices, each device being of a type provided for in group H01L27/00 or H01L29/00
    • 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
    • D21F1/0027—Screen-cloths
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/006—Making patterned paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/08—Felts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/0001—Technical content checked by a classifier
    • H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00

Definitions

  • the present invention relates to papermakers felts and more particularly to a
  • Standard press felts generally have an essentially smooth surface so as not to mark the paper web supported on the felt during the pressing operation.
  • Marking felts are used to produce paper which
  • Press felts for use in the press section of a pulp dryer machine may also be provided with an embossed surface so as to
  • WO 96/25555 relates to a method of making a papermakers forming fabric or a
  • papermakers dryer fabric having a patterned resin surface with openings through which
  • this felt is used as a pick-up felt in a Yankee cylinder dryer
  • marking press felt marking press felt, press felt for dewatering pulp or as a deflection fabric or through air dryer (TAD) fabric for forming a tissue web.
  • TAD air dryer
  • the present invention seeks to provide a simple and relatively less costly
  • a method of making a papermakers fabric comprising a batt of fibres, the fabric having an embossed surface, said method comprising the steps of directing ultrasonic energy
  • the ultrasonic tool may, in use, melt not only some of the batt fibres, but also at least some of the base cloth yarns, at least in part.
  • the imprinting may be achieved by way of an engraving wheel or roller. The imprinting step may take place
  • the felt may be foraminous so as to make it suitable as a forming belt for tissue. This could be done by using the ultrasonic tool to make small perforations in the embossed area, or by laser cutting.
  • a method of compacting a batt of fibres comprising the steps of directing ultrasonic energy onto the said batt so as to at least partially melt the fibres of the batt, said method further comprising compacting the said fibres of the batt while the fibres
  • the compacting step takes place as ultrasonic energy is simultaneously directed onto the said batt.
  • the method of the invention reduces the felt thickness and void volume of the batt as well as yielding a more smooth batt surface. This results in quicker felt start-up on the paper machine, particularly if the paper side of the felt is pre-compacted. Start ⁇
  • the ultrasonic pre-compaction method of the invention takes place at the
  • finishing stage of felt making ideally at the same time as heat-setting of the felt.
  • the felt is not embossed during pre-compaction, with a smooth
  • the compactor ideally has circumferential grooves to leave a corresponding embossed pattern in the pulp or paper side of the felt.
  • Fig.l is a diagrammatic illustration of one apparatus for use in the process of the invention.
  • Fig. 2 is a diagrammatic illustration of a second apparatus for use in the process of the invention.
  • an endless press felt 10 comprising a plurality of batts of
  • the felt 10 is fed over a series of sonic horns 12 which bear against the papermakers felt.
  • An anvil 13 is provided in register with the series of horns 12, but on the opposite side of the press felt. Neither the horns 12 nor the press felt is heated. Heat is generated with the
  • the ultrasonic horn 12 melts the fibrous batt surface of the fabric 10. The fabric 10 subsequently
  • press rollers 14,15 passes through the nip between press rollers 14,15.
  • One of the press rollers 14 has an engraving surface. This acts to imprint a pattern in the fused fibrous material. This subsequently solidifies to form a 3D embossed pattern in the batt that resists
  • Fig.2 shows an arrangement similar to that illustrated in fig.1 except in that the embossing step takes place at the same time as the ultrasonic welding step.
  • the embossing step takes place at the same time as the ultrasonic welding step.
  • embossing wheel acts as an anvil and there is no need to provide a static anvil as
  • figs. 1 and 2 may be used to simply compact one or more batts of fibres by directing ultrasonic energy onto the batt so as to at least partially melt the fibres of the batt, the method further comprising

Abstract

A method of making a papermakers felt comprises the steps of direting ultrasonic energy onto the batt of fibres so as to at least partially melt the fibres provided on a surface of the fabric. A pattern is then imprinted into the batt whilst the fibres are in a molten state.

Description

PAPFttMAKERS FELTS
The present invention relates to papermakers felts and more particularly to a
method for making embossed papermakers felts.
The use of press felts during the manufacturing process for making paper is
well documentated. Standard press felts generally have an essentially smooth surface so as not to mark the paper web supported on the felt during the pressing operation.
Some types of papermakers felts, however, are provided either with an embossed
pattern on the felt surface, or with harder yarns strategically placed just below the
fibrous face layer. Marking felts, for example, are used to produce paper which
requires a distinctive pattern embossed thereon. Press felts for use in the press section of a pulp dryer machine may also be provided with an embossed surface so as to
improve the drying efficiency. A further use of such embossed papermakers felts is in
the web pick-up arrangement of a Yankee machine which transfers the formed web to
a press felt.
WO 96/25555 relates to a method of making a papermakers forming fabric or a
papermakers dryer fabric having a patterned resin surface with openings through which
air and/or water is conveyed during paper formation and drying of the paper. This
process is time consuming and expensive.
In particular this felt is used as a pick-up felt in a Yankee cylinder dryer
process, marking press felt, press felt for dewatering pulp or as a deflection fabric or through air dryer (TAD) fabric for forming a tissue web.
The present invention seeks to provide a simple and relatively less costly
method of making an embossing papermakers felt.
According to a first aspect of the present invention there is provided a method of making a papermakers fabric comprising a batt of fibres, the fabric having an embossed surface, said method comprising the steps of directing ultrasonic energy
onto the batt of fibres so as to at least partially melt the fibres provided on a surface of the fabric, said method further comprising the step of imprinting a pattern into the batt
of fibres whilst the fibres are in a molten state.
According to a second aspect of the present invention there is provided a
method of providing an embossed fibrous batt for use in a papermakers fabric, said method comprising the steps of directing ultrasonic energy onto the batt of fibres so as to at least partially melt the fibres which are to be provided on a surface of the papermakers fabric, said method further comprising the step of imprinting a pattern
into the batt of fibres whilst the fibres are in a molten state.
Either of these methods is quick and simple to use. It is also inexpensive and can be achieved using simple equipment.
The ultrasonic tool may, in use, melt not only some of the batt fibres, but also at least some of the base cloth yarns, at least in part. The imprinting may be achieved by way of an engraving wheel or roller. The imprinting step may take place
immediately after or more preferably simultaneously with directing the ultrasonic energy at the fibres.
The felt may be foraminous so as to make it suitable as a forming belt for tissue. This could be done by using the ultrasonic tool to make small perforations in the embossed area, or by laser cutting.
It is noted that this technology is useful not only in providing an embossed
fibrous batt, but also in densifying a batt of fibres which need not necessarily be embossed. The densifying or pre-compaction of batts of fibrous material is generally
carried out by needle punching. However, the use of needle punching for pre-
compaction is restricted in that high felt densities can not be achieved without damaging the felt fibres.
This aspect of the present invention has been made from a consideration of this
problem.
According to a further aspect of the present invention there is provided a method of compacting a batt of fibres, said method comprising the steps of directing ultrasonic energy onto the said batt so as to at least partially melt the fibres of the batt, said method further comprising compacting the said fibres of the batt while the fibres
of the batt are in a molten state.
Preferably the compacting step takes place as ultrasonic energy is simultaneously directed onto the said batt.
The method of the invention reduces the felt thickness and void volume of the batt as well as yielding a more smooth batt surface. This results in quicker felt start-up on the paper machine, particularly if the paper side of the felt is pre-compacted. Start¬
up involves ensuring that the felt is wetted out and its surface smoothened, at which
point it is ready to process the paper web.
The ultrasonic pre-compaction method of the invention takes place at the
finishing stage of felt making, ideally at the same time as heat-setting of the felt.
Preferably the felt is not embossed during pre-compaction, with a smooth
surface compactor such as a roll being used. For pre-compacting pulp dryer felts or
marking felts the compactor ideally has circumferential grooves to leave a corresponding embossed pattern in the pulp or paper side of the felt. In order that the present invention may be more readily understood specific
embodiments thereof will now be described by way of example only with reference to the accompanying drawings in which:-
Fig.l is a diagrammatic illustration of one apparatus for use in the process of the invention; and
Fig. 2 is a diagrammatic illustration of a second apparatus for use in the process of the invention.
In the drawings similar reference numerals are used to represent like parts.
Referring to fig.1 an endless press felt 10 comprising a plurality of batts of
fibres needled onto a base cloth is located over four rollers 11. The felt 10 is fed over a series of sonic horns 12 which bear against the papermakers felt. An anvil 13 is provided in register with the series of horns 12, but on the opposite side of the press felt. Neither the horns 12 nor the press felt is heated. Heat is generated with the
material itself by the absorption of energy from the ultrasonic horn 12. The ultrasonic horn 12 melts the fibrous batt surface of the fabric 10. The fabric 10 subsequently
passes through the nip between press rollers 14,15. One of the press rollers 14 has an engraving surface. This acts to imprint a pattern in the fused fibrous material. This subsequently solidifies to form a 3D embossed pattern in the batt that resists
degradation resulting from repeated passages through a press nip.
Fig.2 shows an arrangement similar to that illustrated in fig.1 except in that the embossing step takes place at the same time as the ultrasonic welding step. Here the
embossing wheel acts as an anvil and there is no need to provide a static anvil as
illustrated in fig.1.
It is to be understood that the above described embodiments of the invention are made by way of illustration only. Many modifications and variations are possible. For example, one or more batts of fibre rather than the papermakers fabric per
se, which includes a base cloth, may be passed through the apparatus as illustrated in figs. 1 and 2. Furthermore the apparatus of figs. 1 and 2 may be used to simply compact one or more batts of fibres by directing ultrasonic energy onto the batt so as to at least partially melt the fibres of the batt, the method further comprising
compacting the said fibres of the batt while the fibres of the batt are in a molten state.

Claims

CLALMS
1. A method of making a papermakers fabric comprising a batt of fibres, the fabric
having an embossed surface, said method comprising the steps of directing ultrasonic energy onto the batt of fibres so as to at least partially melt the fibres provided on a
surface of the fabric, said method further comprising the step of imprinting a pattern
into the batt of fibres whilst the fibres are in a molten state.
2. A method of making a papermakers fabric as claimed in claim 1, wherein the batt is secured to a base fabric and at least some of the base fabric is melted by the
ultrasonic energy.
3. A method of making a papermakers fabric as claimed in claim 1 or claims 2, wherein the imprinting is achieved by way of an engraving wheel or roller.
4. A method of making a papermakers fabric as claimed in any preceding claim, wherein imprinting takes place immediately after the step of directing the ultrasonic
energy onto the batt.
5. A method of making a papermakers fabric as claimed in any preceding claim,
wherein imprinting takes place simultaneously with the step of directing the ultrasonic energy onto the batt.
6. A method of making a papermakers fabric as claimed in any preceding claim, wherein the method further comprises the step of making the batt foraminous.
7. A method of making a papermakers fabric as claimed in claim 6, wherein the
batt is made foraminous by using the tool for directing the ultrasonic energy to make small perforations in the batt.
8. A method of making a papermakers fabric as claimed in claim 6, wherein the batt is made foraminous by laser cutting.
9. A method of providing an embossed fibrous batt for use in a papermakers fabric, said method comprising the steps of directing ultrasonic energy onto the batt of
fibres so as to at least partially melt the fibres which are to be provided on a surface of
the papermakers fabric, said method further comprising the step of imprinting a pattern
into the batt of fibres whilst the fibres are in a molten state.
10. A method of making a papermakers fabric as claimed in claim 9, wherein the imprinting is achieved by way of an engraving wheel or roller.
11. A method of making a papermakers fabric as claimed in claim 9 or claim 10,
wherein imprinting takes place immediately after the step of directing the ultrasonic
energy onto the batt.
12. A method of making a papermakers fabric as claimed in any of claims 9 to 11, wherein imprinting takes place simultaneously with the step of directing the ultrasonic energy onto the batt.
13. A method of making a papermakers fabric as claimed in any of claims 9 to 12,
wherein the method further comprises the step of making the batt foraminous.
14. A method of making a papermakers fabric as claimed in claim 13, wherein the batt is made foraminous by using the tool for directing the ultrasonic energy to make
small perforations in the batt.
15. A method of making a papermakers fabric as claimed in claim 13, wherein the
batt is made foraminous by laser cutting.
16. A method of compacting a batt of fibres, said method comprising the steps of directing ultrasonic energy onto the said batt so as to at least partially melt the fibres of the batt, said method further comprising compacting the said fibres of the batt while
the fibres of the batt are in a molten state.
17. A method of compacting a batt of fibres as claimed in claim 16, wherein the
said step of compacting the fibres takes place while the ultrasonic energy is directed onto the said batt.
18. A method of compacting a batt as claimed in claim 16 or claim 17, wherein the method takes place during heat-setting of a felt.
19. A method of compacting a batt as claimed in claim 18, wherein the felt is embossed during the compacting step.
PCT/GB1997/003186 1996-12-17 1997-11-20 Papermakers felts WO1998027277A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB9913006A GB2334536A (en) 1996-12-17 1997-11-20 Papermakers felts
AU50605/98A AU5060598A (en) 1996-12-17 1997-11-20 Papermakers felts

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GBGB9626153.2A GB9626153D0 (en) 1996-12-17 1996-12-17 Papermakers felts
GB9626153.2 1996-12-17
GB9713595.8 1997-06-28
GBGB9713595.8A GB9713595D0 (en) 1997-06-28 1997-06-28 Papermakers felts

Publications (1)

Publication Number Publication Date
WO1998027277A1 true WO1998027277A1 (en) 1998-06-25

Family

ID=26310652

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1997/003186 WO1998027277A1 (en) 1996-12-17 1997-11-20 Papermakers felts

Country Status (3)

Country Link
AU (1) AU5060598A (en)
GB (1) GB2334536A (en)
WO (1) WO1998027277A1 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999055960A1 (en) * 1998-04-23 1999-11-04 The Procter & Gamble Company Ultrasonically-assisted process for making differential density cellulosic structure containing fluid-latent indigenous polymers
EP0999306A2 (en) * 1998-11-02 2000-05-10 Albany International Corp. Embossed fabrics and method of making the same
US6726809B2 (en) 2001-09-26 2004-04-27 Albany International Corp. Industrial process fabric
US7141142B2 (en) * 2003-09-26 2006-11-28 Kimberly-Clark Worldwide, Inc. Method of making paper using reformable fabrics
US7294238B2 (en) * 2002-12-19 2007-11-13 Kimberly-Clark Worldwide, Inc. Non-woven through air dryer and transfer fabrics for tissue making
US7514030B2 (en) 2002-12-30 2009-04-07 Albany International Corp. Fabric characteristics by flat calendering
DE102008000066A1 (en) 2008-01-16 2009-07-23 Voith Patent Gmbh Belt for use as e.g. voltage pressing belt, in paper-making machine, has additional connection provided by ultrasonic welding in part of seam or seam region, and longitudinal thread and/or transverse threads in contact with one another

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4879155A (en) * 1986-05-27 1989-11-07 Mitsuo Fujisawa Pleated cloth and method for producing the same
US4902366A (en) * 1987-01-10 1990-02-20 Corovin Gmbh Process and apparatus for bonding and embossing sheet materials, particularly fiber matting
EP0394134A1 (en) * 1989-04-21 1990-10-24 Papeteries De Gascogne Process for marking a flexible structure, flexible structure obtained and its use in a process for marking a cellulose web
JPH08158286A (en) * 1994-12-02 1996-06-18 Daiwabo Co Ltd Selvage-reinforced drier canvas for papermaking and method for processing the same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4879155A (en) * 1986-05-27 1989-11-07 Mitsuo Fujisawa Pleated cloth and method for producing the same
US4902366A (en) * 1987-01-10 1990-02-20 Corovin Gmbh Process and apparatus for bonding and embossing sheet materials, particularly fiber matting
EP0394134A1 (en) * 1989-04-21 1990-10-24 Papeteries De Gascogne Process for marking a flexible structure, flexible structure obtained and its use in a process for marking a cellulose web
JPH08158286A (en) * 1994-12-02 1996-06-18 Daiwabo Co Ltd Selvage-reinforced drier canvas for papermaking and method for processing the same

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 096, no. 010 31 October 1996 (1996-10-31) *

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6090241A (en) * 1997-06-06 2000-07-18 The Procter & Gamble Company Ultrasonically-assisted process for making differential density cellulosic structure containing fluid-latent indigenous polymers
WO1999055960A1 (en) * 1998-04-23 1999-11-04 The Procter & Gamble Company Ultrasonically-assisted process for making differential density cellulosic structure containing fluid-latent indigenous polymers
EP0999306A2 (en) * 1998-11-02 2000-05-10 Albany International Corp. Embossed fabrics and method of making the same
JP2000282385A (en) * 1998-11-02 2000-10-10 Albany Internatl Corp Cloth with raised figure and its production
EP0999306A3 (en) * 1998-11-02 2001-08-16 Albany International Corp. Embossed fabrics and method of making the same
US6554963B1 (en) 1998-11-02 2003-04-29 Albany International Corp. Embossed fabrics and method of making the same
US6726809B2 (en) 2001-09-26 2004-04-27 Albany International Corp. Industrial process fabric
US7294238B2 (en) * 2002-12-19 2007-11-13 Kimberly-Clark Worldwide, Inc. Non-woven through air dryer and transfer fabrics for tissue making
AU2003231212B2 (en) * 2002-12-19 2008-07-03 Kimberly-Clark Worldwide, Inc. Non-woven through air dryer and transfer fabrics for tissue making
AU2003231212C1 (en) * 2002-12-19 2008-12-11 Kimberly-Clark Worldwide, Inc. Non-woven through air dryer and transfer fabrics for tissue making
US7514030B2 (en) 2002-12-30 2009-04-07 Albany International Corp. Fabric characteristics by flat calendering
US7141142B2 (en) * 2003-09-26 2006-11-28 Kimberly-Clark Worldwide, Inc. Method of making paper using reformable fabrics
DE102008000066A1 (en) 2008-01-16 2009-07-23 Voith Patent Gmbh Belt for use as e.g. voltage pressing belt, in paper-making machine, has additional connection provided by ultrasonic welding in part of seam or seam region, and longitudinal thread and/or transverse threads in contact with one another

Also Published As

Publication number Publication date
GB2334536A (en) 1999-08-25
GB9913006D0 (en) 1999-08-04
AU5060598A (en) 1998-07-15

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