GB2146673A - Method of treating a web - Google Patents

Method of treating a web Download PDF

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Publication number
GB2146673A
GB2146673A GB08324943A GB8324943A GB2146673A GB 2146673 A GB2146673 A GB 2146673A GB 08324943 A GB08324943 A GB 08324943A GB 8324943 A GB8324943 A GB 8324943A GB 2146673 A GB2146673 A GB 2146673A
Authority
GB
United Kingdom
Prior art keywords
web
binder
curing agent
curing
resin
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Withdrawn
Application number
GB08324943A
Other versions
GB8324943D0 (en
Inventor
David Nigel Dumolo
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.)
Fordath Ltd
Original Assignee
Fordath Ltd
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
Application filed by Fordath Ltd filed Critical Fordath Ltd
Priority to GB08324943A priority Critical patent/GB2146673A/en
Publication of GB8324943D0 publication Critical patent/GB8324943D0/en
Publication of GB2146673A publication Critical patent/GB2146673A/en
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/58—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives
    • D04H1/64—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives the bonding agent being applied in wet state, e.g. chemical agents in dispersions or solutions
    • D04H1/655—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives the bonding agent being applied in wet state, e.g. chemical agents in dispersions or solutions characterised by the apparatus for applying bonding agents
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/58—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives
    • D04H1/587—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives characterised by the bonding agents used
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/58—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives
    • D04H1/64—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives the bonding agent being applied in wet state, e.g. chemical agents in dispersions or solutions
    • D04H1/645—Impregnation followed by a solidification process
    • 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
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/02—Chemical or biochemical treatment

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Dispersion Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • Paper (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Reinforced Plastic Materials (AREA)

Abstract

A paper web (11) is impregnated by a solution or dispersion of a curable resin, typically a phenol- formaldehyde resin. The web (11) is then subjected to the vapour of a volatile ester which initiates curing of the resin at ambient temperature. Heating of the web (11) is avoided. A polyol-polyisocyonate binder is cured by a tertiary amine. <IMAGE>

Description

SPECIFICATION Method of treating a web The present invention relates to a method of treating a fibrous web.
It is known to treat fibrous webs, for example paper, by impregnating the web with a liquid composition containing a curable resin and subsequently heating the impregnated web to cure the resin. Treatments of this kind are used to improve the strength and stiffness of fibrous webs.
In a method according to the present invention, a curable binder in liquid form is applied to a fibrous web and a curing agent is brought into contact with the binder whilst the binder is carried by the web. The curing agent may be a catalyst which is still present after the curing reaction or the curing agent may be a co-reactant for the curable binder.
The curing agent acts to initiate or accelerate curing of the binder, at least to a more highly polymerised state than the state in which the binder is applied to the web.
When the web bearing the curable binder and the curing agent are brought into contact with one another, they are both preferably at ambient temperature or a temperature not in excess of 60"C.
The curing agent is preferably present in gaseous form, when brought into contact with the binder. The curing agent may be present in the gaseous form alone or in both the liquid and gaseous forms. The curing agent may be a volatile liquid which is sprayed onto the web and which evaporates to provide a gaseous curing agent.
An example of a method in accordance with the invention is illustrated diagrammatically in the accompanying drawing.
The apparatus illustrated in the accompanying drawing includes means 10 for applying a curable binder in liquid form to a web 11 of fibrous material at an impregnating station.
The resin-applying means includes a reservoir 1 2 containing a bulk supply of a liquid which comprises a curable resin. The resin itself may be a liquid. However, the resin will generally be dissolved in and/or dispersed in a liquid medium which facilitates impregnation of the web by the mixture.
For transferring the resin composition from the reservoir 1 2 to the web 11, there is provided an applicator roller 13, a lower part of which dips into the resin composition and an upper part of which is engaged by the web 11 as the web travels through the impregnating station. A backing roll 14 is provided to maintain the web in contact with the roller 1 3. To control the amount of resin composition transferred from the reservoir to the web 11, there is provided a doctor blade or a doctor roller 1 5.
The web 11 may be fed to the impregnating station continuously, successive lengths of the web being jointed end-to-end. Alternatively, a length of the web drawn from a single reel may be passed through the impregnating station and a further length of the web passed through the station after an interval.
The resin-applying means may be arranged to apply the resin composition to both faces of the web. The web may have a woven or nonwoven structure, for example being a web of paper.
The resin composition contained in the reservoir 1 2 may include a phenol-formaldehyde resin, preferably one obtained by reacting phenol and formaldehyde under alkaline conditions to the "B" stage. The composition typically comprises 30% resin solids dissolved and/or dispersed in a mixture of water and a more volatile organic solvent, for example methanol.
An alternative resin composition is one comprising a polyol and a polyisocyanate. The expression "resin composition" is used herein to embrace a mixture of monomers or of a monomer with a prepolymer which will polymerise. One suitable type of polyol is a phenolic resin. The polyol and polyisocianate would preferably be dissolved in a solvent which includes an organic, volatile solvent and, possibly, water.
The apparatus illustrated in the accompanying drawing further comprises means for establishing contact between the curable binder on the web 11 which has left the impregnating station, and a curing agent for the binder. This contact is established at a curing station where there is provided a housing 1 6 defining a chamber 17, through which the impregnated web passes. To restrict or prevent escape of the curing agent from the chamber 17, the housing 1 6 is provided with inlet means 1 8 and outlet means 1 9 for the web 11.The inlet means may comprise a pair of rollers between which the web passes, these rollers being urged lightly together or mounted for rotation about respective axes which are fixed with respect to the housing 1 6 and are so spaced that the gap between the rollers is substantially equal to the thickness of the impregnated web. The outlet means may comprise a similar arrangement of rollers. One or more of the rollers may be driven or all of the rollers may be idle.
At the downstream side of the housing 16, there may be provided a further chamber (not shown) where curing agent trapped in the web 11 as the latter leaves the chamber 1 7 is removed, or partly removed, from the web.
The web may be purged by a stream of air immediately downstream of the outlet means 19.
The curing agent present in the chamber 1 7 is selected to be capable of initiating or accelerating curing of the binder with which the web 11 is impregnated, either to a sub stantially completely cured state or to a more highly polymerised state than the state in which the binder enters the housing 1 6. The curing agent is preferably a gas or the vapour of a liquid which is more volatile than water.
The impregnated web 11 may be contacted in the chamber 1 7 by the vapour only of a volatile curing agent or the liquid curing agent may be sprayed onto the web, to evaporate and provide the vapour.
As illustrated in the drawing, in a case where the curing agent is the vapour of a volatile liquid, a reservoir of the liquid curing agent may be contained in the housing 1 6 and provided with a heating element 20 which supplies thermal energy to the curing agent at a rate sufficient to maintain a predetermined vapour pressure of the curing agent in the chamber 1 7.
In a case where the resin composition in the reservoir 1 3 comprises a phenol-formaldehyde resin, the curing agent present in the chamber 1 8 may be methylformate or another ester capable of initiating curing of the phenolic resin. In a case where the resin composition comprises a polyol and a polyisocianate, the curing agent in the chamber 1 7 is preferably a tertiary amine or other catalyst for the reaction which forms a polyurethane. Even if each point on the web 11 is present in the chamber 1 7 for only a few seconds. treatment with a tertiary amine will generally be sufficient for curing of the binder to be substantially complete when the web emerges from the chamber.In cases where other binders and other curing agents are used, curing may continue after the web leaves the chamber 1 7 and may continue for several hours.
Curing of a polyol-polyisocyanate binder by means of a tertiary amine and curing of a phenolic resin by means of an ester proceed at a satisfactory speed at ambient temperature. It is therefore generally unnecessary to heat the impregnated web for curing. In consequence of this, the methods herein described utilise thermal energy at a rate which is much lower than that required by known processes for impregnating webs with resin and curing the resin.
Water and/or other solvent may be permitted to evaporate from the web 11 as the web passes between the impregnating station and the curing station. If required, such evaporation may be promoted by impingement of a current of air or other gas on the web or by heating of the web. It is envisaged that some solvent would remain in the web 11 when the latter enters the chamber 1 7.
Webs treated in accordance with the present invention, especially paper webs, are suitable for use in filters, for example air filters used in conjunction with internal combustion engines. The web may be folded into the shape required in the filter after curing of the resin. Alternatively, the web may be folded into the required shape prior to curing. In the latter case, inlet means 1 8 and outlet means 1 9 of the particular form illustrated in the accompanying drawing would not be used and more elaborate arrangements would be needed to prevent escape of the curing agent from the curing station. Folding of the web to the required shape may take place after the web has left the curing station but before curing is complete.
It will be noted that rapid curing of the binder does not occur until the binder is contacted by the curing agent. This occurs only after the binder has been applied to the web and the web has advanced from the impregnating station. Accordingly, the bulk supply of binder at the impregnating station can be used over a prolonged period without setting of the binder composition. Wastage of unused binder can be substantially avoided.
The weight of resin-derived polymer present in the cured and dried product is typically within the range 20% to 25%. We have found that, if a paper web impregnated in the manner hereinbefore described with a curable binder is folded after curing has been completed, the reduction in tensile strength resulting from folding is not substantially greater than 5%.

Claims (5)

1. A method of treating a fibrous web wherein a curable binder in liquid form is applied to the web and a curing agent is brought into contact with the binder whilst the binder is carried by the web.
2. A method according to Claim 1 wherein the temperature of the web is not raised above 100"C.
3. A method according to Claim 1 or Claim 2 wherein the curing agent is present in gaseous form when it contacts the binder carried by the web.
4. A method of treating a web substantially as hereinbefore described with reference to the accompanying drawing.
5. Any novel feature or novel combination of features disclosed herein and/or in the accompanying drawing.
GB08324943A 1983-09-17 1983-09-17 Method of treating a web Withdrawn GB2146673A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08324943A GB2146673A (en) 1983-09-17 1983-09-17 Method of treating a web

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08324943A GB2146673A (en) 1983-09-17 1983-09-17 Method of treating a web

Publications (2)

Publication Number Publication Date
GB8324943D0 GB8324943D0 (en) 1983-10-19
GB2146673A true GB2146673A (en) 1985-04-24

Family

ID=10548941

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08324943A Withdrawn GB2146673A (en) 1983-09-17 1983-09-17 Method of treating a web

Country Status (1)

Country Link
GB (1) GB2146673A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998011288A1 (en) * 1996-09-16 1998-03-19 Kalle Nalo Gmbh & Co. Kg Cellulose bonded nonwoven fiber fabric and method for the production thereof
WO2010040781A2 (en) * 2008-10-07 2010-04-15 Kaindl Decor Gmbh Device for impregnating a web-type material with thermally curable impregnating resin

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB873700A (en) * 1958-07-24 1961-07-26 Portals Ltd Improvements in or relating to methods for making webs of fibrous material
GB1092938A (en) * 1964-04-23 1967-11-29 Kalle Ag Improvements in and relating to reinforcing woven and non-woven fabrics
GB1185216A (en) * 1966-05-28 1970-03-25 Basf Ag Production of coated, impregnated or bonded articles
GB1248515A (en) * 1968-09-23 1971-10-06 Bakelite Improvements in or relating to a process for the preparation of agglomerates
GB1397665A (en) * 1973-02-10 1975-06-18 Evans Adlard Co Ltd Production of fibrous webs

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB873700A (en) * 1958-07-24 1961-07-26 Portals Ltd Improvements in or relating to methods for making webs of fibrous material
GB1092938A (en) * 1964-04-23 1967-11-29 Kalle Ag Improvements in and relating to reinforcing woven and non-woven fabrics
GB1185216A (en) * 1966-05-28 1970-03-25 Basf Ag Production of coated, impregnated or bonded articles
GB1248515A (en) * 1968-09-23 1971-10-06 Bakelite Improvements in or relating to a process for the preparation of agglomerates
GB1397665A (en) * 1973-02-10 1975-06-18 Evans Adlard Co Ltd Production of fibrous webs

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998011288A1 (en) * 1996-09-16 1998-03-19 Kalle Nalo Gmbh & Co. Kg Cellulose bonded nonwoven fiber fabric and method for the production thereof
US6048917A (en) * 1996-09-16 2000-04-11 Kalle Nalo Gmbh & Co. Kg Cellulose bonded nonwoven fiber fabric and method for the production thereof
WO2010040781A2 (en) * 2008-10-07 2010-04-15 Kaindl Decor Gmbh Device for impregnating a web-type material with thermally curable impregnating resin
WO2010040781A3 (en) * 2008-10-07 2011-03-10 Kaindl Decor Gmbh Device for impregnating a web-type material with thermally curable impregnating resin
CN102216525A (en) * 2008-10-07 2011-10-12 凯得装饰有限公司 Device for impregnating a web-type material with thermally curable impregnating resin
CN102216525B (en) * 2008-10-07 2013-11-06 凯得装饰有限公司 Device for impregnating a web-type material with thermally curable impregnating resin
US8945679B2 (en) 2008-10-07 2015-02-03 Kaindl Decor Gmbh Apparatus for impregnating web-like materials with thermally curable impregnating resin

Also Published As

Publication number Publication date
GB8324943D0 (en) 1983-10-19

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Legal Events

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)