EP0255318B1 - Method of making a water laid fibrous web containing one or more fine powders - Google Patents

Method of making a water laid fibrous web containing one or more fine powders Download PDF

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Publication number
EP0255318B1
EP0255318B1 EP87306604A EP87306604A EP0255318B1 EP 0255318 B1 EP0255318 B1 EP 0255318B1 EP 87306604 A EP87306604 A EP 87306604A EP 87306604 A EP87306604 A EP 87306604A EP 0255318 B1 EP0255318 B1 EP 0255318B1
Authority
EP
European Patent Office
Prior art keywords
particles
plastics
web
fibres
particulate
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.)
Expired - Lifetime
Application number
EP87306604A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0255318A3 (en
EP0255318A2 (en
Inventor
Anthony John Willis
Bronislaw Radvan
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.)
Wiggins Teape Group Ltd
Original Assignee
Wiggins Teape Group 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 Wiggins Teape Group Ltd filed Critical Wiggins Teape Group Ltd
Priority to AT87306604T priority Critical patent/ATE66981T1/de
Publication of EP0255318A2 publication Critical patent/EP0255318A2/en
Publication of EP0255318A3 publication Critical patent/EP0255318A3/en
Application granted granted Critical
Publication of EP0255318B1 publication Critical patent/EP0255318B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/36—Inorganic fibres or flakes
    • D21H13/38—Inorganic fibres or flakes siliceous
    • D21H13/40—Inorganic fibres or flakes siliceous vitreous, e.g. mineral wool, glass fibres
    • 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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/33—Synthetic macromolecular compounds
    • 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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/63—Inorganic compounds
    • 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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/63—Inorganic compounds
    • D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
    • 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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/63—Inorganic compounds
    • D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
    • D21H17/675—Oxides, hydroxides or carbonates
    • 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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/63—Inorganic compounds
    • D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
    • D21H17/69—Water-insoluble compounds, e.g. fillers, pigments modified, e.g. by association with other compositions prior to incorporation in the pulp or paper

Definitions

  • This invention relates to a method of making a water laid fibrous web such as a paper web or a web of plastics material and reinforcing fibres for consolidation or moulding into a fibre reinforced plastics sheet or article.
  • particulate materials or powders such as pigments and fillers.
  • particulate plastics material such as pigments and fillers.
  • one or more kind of particulate plastics material may be included, together with materials such as pigments, fillers and antioxidants in the form of powders of substantially smaller particle size than the plastics material.
  • US-A-3 205 085 is directed to a technique for enhancing the retention of titanium dioxide in paper. Prior to introduction into the papermaking stock, the titanium dioxide and sodium carboxymethylcellulose are ground together in a swing hammer mill. This process produces an intimate mixture of the two materials, with the particles being of substantially the same size.
  • GB-A-448 138 is concerned with a filler composition for paper, and, more particularly a composition which enhances the retention of the filler in paper.
  • a filler which may be clay or a pigment such as titanium dioxide, is also present. This reacted mixture produces a thick pasty material which is then added to the papermaking stock before the sheet is laid down.
  • the process for making water laid webs requires as a prerequisite the formation of an aqueous dispersion of the fibres and particulate materials from which the web is to be formed.
  • a foamed dispersion is used as described in the Applicants' EP-A-0 148 760), the subject matter of that Application being incorporated by reference herein.
  • the dispersion so formed is then drained on a foraminous support such as the Fourdrinier wire of a paper machine, to form the web.
  • the invention is particularly concerned with a technique which will improve the homogeneity of the dispersion and resulting sheet, and which, where larger and smaller particles need to be incorporated in the sheet, will increase the retention of the smaller particles where the relative mesh size is such that they would otherwise be substantially lost in drainage through the foraminous element.
  • a method of making a web of reinforcing fibres containing in its interstices particles of at least one plastics material coated with at least one kind of powdered material substantially finer than the particulate plastics comprises the steps of mixing the plastics particles and powdered material together in a substantially dry condition to cause the powdered material to coat the plastics particles, dispersing said coated plastics particles, together with the reinforcing fibres in water to form an aqueous dispersion, and draining the aqueous dispersion to form a web.
  • the particulate materials can be a mixture of particulate thermoplastics.
  • a thermoplastic or a thermosetting polymer can be mixed with a fine powder such as carbon black or titanium dioxide, the dry mix being dispersed in an aqueous dispersion of fibres prior to drainage to form a web.
  • the fibres may, for example, be glass fibres.
  • the method of the invention is suitable for use with the process for forming a fibrous web set forth in the Applicants' EP-A-0 148 760 the subject matter of that Application being incorporated by reference herein.
  • the invention can be employed in the manufacture of a web in which the particulate material is a fibre, the dry mix being used to form an aqueous dispersion of fibres and drained to form a web.
  • the method can also be employed where two or more different fibres are to be incorporated in a web, with one or more of the fibres acting as the particulate material which is dry pre-mixed with the dry fine powder before an aqueous dispersion is formed.
  • the invention provides a successful method of incorporating a fine pigment powder in the web so as to effect a very uniform coloration of mouldings produced using the fibrous web produced by the process, although other fine powders for other purposes such as antioxidants can of course be employed alternatively or in addition to pigments.
  • the fine powder and particulate materials can conveniently be pre-mixed in mixers of the high shear type.
  • the flow chart relates to the production of a foamed aqueous dispersion for use in the manufacture of a pigmented web of reinforcing fibre and particulate plastics material as described and claimed in EP-A-0 148 760.
  • the technique shown may be used for the production of dispersions of two or more particulate plastics materials so as to achieve a homogeneous mixture or of one or more particulate materials with much finer powders of, for example, pigments or antioxidants so as to achieve both homogeneity and retention of the powder during the wet web laying process.
  • the flow chart shows the technique of the invention as used for mixing two particulate polymers of relatively coarse particle size, for example, 100 to 500 ⁇ m, with a pigment having a particle size of, for example, 10 to 100 ⁇ m.
  • the two particulate plastics materials and the pigment are first charged into a high shear powder blender 1, for example a Winkworth Ribbon Refiner Batch Mixer, a Gloucester Materials Handling High Shear Batch Blender or a Continuous Gerick E Blender (Powteck Type GAL 351).
  • Microdiagram 2 shows that after blending the two particulate plastics materials 3a and 3b are evenly mixed and that they are both coated with the pigment 4.
  • the pigment coated particles 3a and 3b are transferred to a hydropulper 5 in which a foamed aqueous dispersion of glass fibres 6 has previously been formed. Because of the homogeneous mixing which has previously taken place in the mixer 1, the homogeneity of the dispersion of fibres and particles thus formed in the hydropulper 5 is assured. Furthermore, substantially all of the powdered pigment 4 continues to adhere to the larger polymeric particles 3a and 3b, as best seen in microdiagram 7.
  • the foamed aqueous dispersion formed in the hydropulper 5 is then used in the formation of a wet laid web in the process 8 which is carried out according to the process described in the aforementioned European Patent Application.
  • the resulting web comprises well distributed glass fibres and polymeric particles, with the polymeric particles still retaining adherent pigments as best seen in microdiagram 9.
  • the formed web is then passed to drying, pressing and moulding stages 10 as required, which do not form part of this invention.
  • the two particulate polymers 3a and 3b and the pigment 4 are added directly to the hydropulper 5 as indicated by the broken lines 11 and not premixed in a substantially dry state in the mixer 1, it is more difficult to achieve homogeneous mixing with the fibres 6 in the dispersion. Furthermore, the powdered pigment becomes dispersed as individual particles in the foamed dispersion, as best seen in microdiagram 12. As a result they tend to be lost in drainage during the wet laying process, so that few or none remain in the formed web, as shown in microdiagram 14.
  • materials which can be premixed as described are not limited to particulate polymers or pigments. Wood or glass fibres, clays and other fillers are understood as falling within the scope of the term "particulate materials" which can be so premixed.
  • plastics materials may comprise thermoplastics or thermosetting plastics particles of various kinds alone or as blends with other plastics for example as follows: Acrylonitrile-butadiene-styrene with Polyvincylchloride Acrylonitrile-butadiene-styrene with Polypropylene Polyphenylene ether with Polypropylene Polyphenylene ether with Polyamide Polycarbonate with Polyalkyleneterephthalate Polycarbonate with Polyestercarbonate Polyvinylchloride with Phenolformaldehyde Polypropylene with Lignin
  • finely powdered antioxidants may be adhered to them by premixing as above described, together with, if desired, pigments such as carbon black or titanium dioxide or fillers such as calcium carbonate.
  • pigments such as carbon black or titanium dioxide or fillers such as calcium carbonate.
  • one of two particulate polymeric plastics to be included may be first ground to a smaller dimension and then adhered to the other plastic by premixing as above described.
  • the particulate material can be the fibres themselves and thus the invention can be used in a paper making process by mixing the fine powder, again, for example a colouring pigment, with the fibres, for example, cellulose fibres in dry form and then using the mix to form an aqueous dispersion, laying this on a wire and forming a paper web in the usual manner.
  • a colouring pigment for example, cellulose fibres in dry form
  • the process can also be used if more than one kind of fibre is employed in a web, the fine powders being dry mixed with one or more of the fibres to be used prior to forming the aqueous dispersion.

Landscapes

  • Inorganic Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Paper (AREA)
  • Reinforced Plastic Materials (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Nonwoven Fabrics (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Processes Of Treating Macromolecular Substances (AREA)
  • Cosmetics (AREA)
  • Inorganic Fibers (AREA)
  • Coloring (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Filtering Materials (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Artificial Filaments (AREA)
EP87306604A 1986-07-31 1987-07-27 Method of making a water laid fibrous web containing one or more fine powders Expired - Lifetime EP0255318B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87306604T ATE66981T1 (de) 1986-07-31 1987-07-27 Verfahren zur herstellung einer ein oder mehrere feine pulver enthaltenden, wassergelegten faserbahn.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB868618733A GB8618733D0 (en) 1986-07-31 1986-07-31 Water laid fibrous web
GB8618733 1986-07-31

Publications (3)

Publication Number Publication Date
EP0255318A2 EP0255318A2 (en) 1988-02-03
EP0255318A3 EP0255318A3 (en) 1989-12-27
EP0255318B1 true EP0255318B1 (en) 1991-09-04

Family

ID=10602028

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87306604A Expired - Lifetime EP0255318B1 (en) 1986-07-31 1987-07-27 Method of making a water laid fibrous web containing one or more fine powders

Country Status (17)

Country Link
EP (1) EP0255318B1 (ko)
JP (1) JP2666138B2 (ko)
KR (1) KR950006814B1 (ko)
AT (1) ATE66981T1 (ko)
AU (1) AU594178B2 (ko)
BR (1) BR8703884A (ko)
CA (1) CA1280259C (ko)
DE (1) DE3772661D1 (ko)
DK (1) DK170539B1 (ko)
ES (1) ES2024513B3 (ko)
FI (1) FI87090C (ko)
GB (1) GB8618733D0 (ko)
GR (1) GR3002956T3 (ko)
IE (1) IE59732B1 (ko)
NO (1) NO174263C (ko)
PT (1) PT85418B (ko)
ZA (1) ZA875506B (ko)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0253993A (ja) * 1988-08-16 1990-02-22 Asahi Chem Ind Co Ltd 抄紙法による繊維補強樹脂シートへの添加剤の添加方法
CA2106394A1 (en) * 1992-01-16 1993-07-17 Isao Suzuki Paper additive for hot-pressed forms and hot-pressed forms using it

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2000031A (en) * 1932-04-11 1935-05-07 Vanderbilt Co R T Composition of matter, etc.
DE1151893B (de) * 1961-08-25 1963-07-25 Pigment Chemie G M B H Verfahren zur Herstellung eines Weisspigments fuer die Papier- und Pappeherstellung
JPS5944439B2 (ja) * 1976-07-20 1984-10-29 靖男 佐藤 内填強力紙とその製法
US4495245A (en) * 1983-07-14 1985-01-22 E. I. Du Pont De Nemours And Company Inorganic fillers modified with vinyl alcohol polymer and cationic melamine-formaldehyde resin
GB8400290D0 (en) * 1984-01-06 1984-02-08 Wiggins Teape Group Ltd Fibre reinforced plastics structures
GB8400293D0 (en) * 1984-01-06 1984-02-08 Wiggins Teape Group Ltd Moulded fibre reinforced plastics articles
JPS614756A (ja) * 1984-06-20 1986-01-10 Tokuyama Soda Co Ltd 複合粉体の製造方法

Also Published As

Publication number Publication date
FI87090C (fi) 1992-11-25
AU7614387A (en) 1988-02-04
JP2666138B2 (ja) 1997-10-22
NO873140D0 (no) 1987-07-27
FI87090B (fi) 1992-08-14
DK389887A (da) 1988-02-01
FI873265A (fi) 1988-02-01
CA1280259C (en) 1991-02-19
GB8618733D0 (en) 1986-09-10
AU594178B2 (en) 1990-03-01
PT85418B (pt) 1993-07-30
ATE66981T1 (de) 1991-09-15
ES2024513B3 (es) 1992-03-01
KR880001410A (ko) 1988-04-23
DE3772661D1 (de) 1991-10-10
DK389887D0 (da) 1987-07-27
PT85418A (pt) 1988-07-29
BR8703884A (pt) 1988-03-29
EP0255318A3 (en) 1989-12-27
IE59732B1 (en) 1994-03-23
NO873140L (no) 1988-02-01
NO174263C (no) 1994-04-06
IE872030L (en) 1988-01-31
KR950006814B1 (ko) 1995-06-22
DK170539B1 (da) 1995-10-16
ZA875506B (en) 1988-02-01
EP0255318A2 (en) 1988-02-03
NO174263B (no) 1993-12-27
GR3002956T3 (en) 1993-01-25
JPS6343000A (ja) 1988-02-24
FI873265A0 (fi) 1987-07-27

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