EP0177425B1 - Nichtgewebtes langfaseriges Blatterzeugnis und sein Herstellungsverfahren - Google Patents

Nichtgewebtes langfaseriges Blatterzeugnis und sein Herstellungsverfahren Download PDF

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Publication number
EP0177425B1
EP0177425B1 EP85401922A EP85401922A EP0177425B1 EP 0177425 B1 EP0177425 B1 EP 0177425B1 EP 85401922 A EP85401922 A EP 85401922A EP 85401922 A EP85401922 A EP 85401922A EP 0177425 B1 EP0177425 B1 EP 0177425B1
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EP
European Patent Office
Prior art keywords
fibres
polyelectrolyte
dose
long
fibers
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
Application number
EP85401922A
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English (en)
French (fr)
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EP0177425A1 (de
Inventor
Louis Vandenbussche
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.)
Papeteries Dalle Et Lecomte SA
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Papeteries Dalle Et Lecomte SA
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Publication date
Application filed by Papeteries Dalle Et Lecomte SA filed Critical Papeteries Dalle Et Lecomte SA
Priority to AT85401922T priority Critical patent/ATE41794T1/de
Publication of EP0177425A1 publication Critical patent/EP0177425A1/de
Application granted granted Critical
Publication of EP0177425B1 publication Critical patent/EP0177425B1/de
Expired legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N5/00—Roofing materials comprising a fibrous web coated with bitumen or another polymer, e.g. pitch
    • 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
    • D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
    • D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
    • D21H15/06—Long fibres, i.e. fibres exceeding the upper length limit of conventional paper-making fibres; Filaments
    • 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
    • D21H17/71—Mixtures of material ; Pulp or paper comprising several different materials not incorporated by special processes
    • 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
    • D21H5/00—Special paper or cardboard not otherwise provided for
    • D21H5/12—Special paper or cardboard not otherwise provided for characterised by the use of special fibrous materials
    • D21H5/1254—Special paper or cardboard not otherwise provided for characterised by the use of special fibrous materials of fibres which have been treated to improve their dispersion in the paper-making furnish
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
    • E04D5/00—Roof covering by making use of flexible material, e.g. supplied in roll form
    • E04D5/02—Roof covering by making use of flexible material, e.g. supplied in roll form of materials impregnated with sealing substances, e.g. roofing felt

Definitions

  • the present invention relates to nonwoven sheet products with long fibers and their manufacturing process by papermaking.
  • the present invention is particularly suitable for producing a dimensionally stable composite sheet capable of exhibiting very high resistance to punching, which can be impregnated, either with bitumen or the like, for example for use in waterproofing. of buildings (in particular of the roofs thereof), or of a resin serving as reinforcement for dimensional stabilization.
  • Such properties are sometimes contradictory and cannot be obtained using only one kind of fiber. It is therefore necessary to use several different kinds of fibers, which may also have different lengths and / or diameters. For example, resistance to aging and dimensional stability are provided by long glass fibers, while resistance to punching is obtained by polyester fibers also of great length.
  • Such a product is for example produced by the superposition of a veil of glass fibers and a veil of polyester fibers, assembled to one another (lamination) and impregnated with bitumen, a resin or the like.
  • the stirring of the fibers necessary for the dispersion of these and for the homogenization of the suspension, generates agglomerations of fibers beyond certain thresholds of length of said fibers.
  • the suspension in the pulper and the storage in the vat therefore limit the usable length of the fibers.
  • the length of the fibers that can be used is thus limited to 6 mm for a titer of 1.7 decitex and to 10 - 15 mm for fibers of higher titer, at the usual concentrations of 0.5 to 1% of feeding of the hydroformer.
  • these artificial and synthetic fibers used are cut to length in "cables" and the sections of cables thus cut form small compact bundles of fibers bonded by the sizes required for manufacture of these cables. After introduction into the water and under the effect of stirring, the bundles come apart, but at the same time, the released fibers are knotted together, all the more quickly the longer they are and the more size is less stable, in particular due to the addition of peptizing agents, surfactants, wetting agents and
  • the invention makes it possible to use such fibers for weight proportions of at least 50% of the finished dry product.
  • the degree of bursting of the long fiber bundles is controlled and they can be kept in a controlled open position for a sufficiently long time, which corresponds to that which flows between the suspending the fibers in preparation and introducing them into the paper machine.
  • the size of the fibers is very important, since it determines the choice of high molecular weight polyelectrolytes to be used according to the types of size, these polyelectrolytes should be chosen from anionic or cationic type.
  • the long sized fibers used in the plurality of operations a), b) and c) of step B of the process according to the invention can be of different types, lengths and diameters. They can also be of the same nature, but of different lengths and diameters.
  • n polyelectrolytes used in this plurality of operations may be different; however, it is advantageous that the doses of polyelectrolytes necessary for the preparation of the suspension of long fibers consist of the same product.
  • short fibers of different natures, synthetic or mineral can be mixed with the cellulosic fibers of said slurry.
  • this porridge can undergo a known treatment based on
  • At least one polyelectrolyte of said treatment is the same as the high molecular weight polyelectrolyte used in the n operations of step B) of preparation of the suspension of long fibers.
  • the long fibers are incorporated into said suspension in decreasing order of difficulties in setting and maintaining suspension: for equal or close, the fibers are introduced successively with decreasing lengths, and at equal or close length, by title croissant.
  • shorter fibers for example of different natures, can be added to it.
  • the present invention relates to a sheet nonwoven product obtained industrially by the papermaking process and comprising cellulosic fibers.
  • This product is remarkable in that it comprises mineral or organic fibers whose length is at least 12 - 18 - 24 - 30 or 34 mm respectively for titles of 1.7 - 3.3 - 4.4 - 6 , 7 or 11 decitex, these long fibers representing at least 30% of the dry weight of said product.
  • Such a product can then have high properties of resistance to punching, impact and tearing, while undergoing significant elongations.
  • such a product can undergo a reinforcing surface treatment.
  • a slurry of cellulosic fibers is prepared in any known manner, for example from a mechanical pulp, a semi-chemical pulp, d '' chemical pulp, unbleached pulp, bleached pulp, soda dough, sulphate dough, kraft dough, bisulphate dough, rags, straw paste, etc ...
  • This slurry in addition to the cellulose fibers and water, can incorporate a coloring matter and is subjected to agitation capable of suspending the fibrous particles.
  • the weight concentration of the cellulosic fibers is for example between 2.5 and 4% and the pulp thus produced is refined to obtain a dewatering index of between approximately 10 and 60 degrees Shopper.
  • the suspension of fibers from installation 1 is introduced (at 2) into a storage tank A.
  • fillers (bonding products and synthetic and / or short mineral fibers, that is to say of which the length is at most equal to approximately 6 mm), are added (in 3). .
  • the mixture then being in the vat A is treated with one or more cationic agents for preparing cellulose, such as those listed in list 22 above and introduced in 4. This or these cationic agents are fixed on the fibers and polarize them uniformly.
  • the proportion used is generally comprised, by weight, between 0.3 and 5% of the dry fibrous material.
  • the excess cationic agent and the free particles of the fibrous suspension are then neutralized by a weak ionic polarization solution, of the anionic type, the active substance of which is for example chosen, from those gathered in the list 111 above and introduced in 5.
  • the required amount of this active substance is for example between 0.3 and 15% of the weight of the dry mixture.
  • the mixture found in the vat A is treated with an anionic polyelectrolyte, of high molecular weight, introduced in 6 and chosen for example from the list given by list 1 above.
  • concentration of this anionic polyelectrolyte is for example between 0.2 and 8% by weight of the dry cellulose.
  • the anionic polyelectrolytes of lists 1 and III are prepared and stored at a concentration of approximately 0.6% a few times before their introduction into 5 and 6 in the vat A.
  • vat B in another vat B capable of generating controlled agitation with constant turbulence movement, a first dose of water is introduced at 7 and at 8 1 the first long sized fibers which are difficult to disperse.
  • a first dose of a high molecular weight polyelectrolyte for example of the anionic type if the hydrated size of said fibers is also anionic.
  • This polyelectrolyte is preferably the same as that used in step A above.
  • the concentration by weight of this high molecular weight polyelectrolyte can be between 0.2 and 5% of the weight of said first fibers.
  • a second dose of water is introduced into the vat 8 (via 7) and second long fibers with size having the same polarity as the first ones (in 8 2 ). These second long fibers are chosen to be less difficult to disperse than said first fibers.
  • a second dose of high molecular weight anionic polyelectrolyte for example that previously used, is added at 9. This second dose is adjusted to keep the polyelectrolyte concentration constant, relative to the total amount of fiber and relative to water.
  • the alternating addition is continued, in the vat 8, of doses of water, long fibers and anionic polyelectrolyte until the nth and last long fibers introduced in 8n.
  • a nonionic surfactant or of the same polarity (anionic in the example chosen) as the polyelectrolyte used previously is then added.
  • the slurry of the vat A is then introduced, respecting the proportions chosen for the constitution of the final nonwoven product.
  • the concentration by weight of fibers in the mixture obtained is at least equal to 1%.
  • This mixture of said fibrous suspension and slurry feeds a hydroformer 11, by means of a pump 12.
  • the liquid mass 13, containing the fibers and feeding the fabric 14 of the hydroformer 11, passes for the most part through said fabric 14 by depositing said fibers thereon in order to form a veil and falls into a receptacle 15 (arrows 16), from which it is brought back to the hydroformer 11 by a pump 17 and a pipe 18.
  • the tank 8 is connected in parallel on line 18, by pump 12.
  • the concentration by weight of fibers of the liquid mass 13 is for example between 0.1% o and 0.5% o.
  • the pH of the liquid mass 13 is adjusted by adding an acid or a base, before introduction into the hydroformer 11. It has in fact been observed that the balance between the fibers dispersed in the fiber bundles is influenced by the pH value. Each fiber solution has an optimal pH value from this point of view.
  • the optimum pH value is determined, case by case, by experimentation.
  • the veil of fibers is optionally treated at the surface with a binder, for example chosen from those from list III above.
  • the treatment can be carried out in a saturation scarf (not shown). Said veil, which is still partially wet, can then be treated with a coating of foam, by wet saturation or spraying before the sheet dries.
  • a 3% suspension of cellulose fibers bleached with sodium hydroxide is prepared in a 6000 liter hydrosherper 1.
  • the fibers have an approximate length of 6 mm and the dough is refined at 40 ° Shopper.
  • the hydroformer 11 is supplied with the mixture of suspensions contained in the vats A and B, diluted by the pump 17 to provide a liquid mass 13 having a total weight concentration of fibers equal to 1.4%.
  • a sheet of nonwoven product is then obtained, the grammage of which is 130 g / m2, and the elongation of 3%.
  • the longitudinal and transverse tear strengths are 30 and 24 kP respectively.
  • the dimensional stability of the product at 200 ° C is 0.1%.
  • a 3% suspension of cellulose fibers bleached with sodium hydroxide is prepared in a 6000 1 hydrrapulper 1.
  • the fibers have an approximate length of 6 mm and the dough is refined at 60 ° Shopper.
  • the pH of the mixture is brought back to the value of 7.5.
  • the mixture 13 supplied to the hydroformer 11 has a concentration of 1.6% of fibers.
  • a suspension is prepared at 3% of cellulose fibers bleached with soda, refined at 60 ° Shopper.
  • the pH is adjusted to 7.2.
  • the fibrous slurry thus obtained is mixed with one or other of the fibrous suspensions obtained in step B of Examples 1 or 2.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Paper (AREA)
  • Nonwoven Fabrics (AREA)

Claims (15)

1. Verfahren zur Herstellung einer Suspension von langen Fasern für eine Papiermaschine, wobei diese Fasern eine Länge von mindestens 12, 18, 24, 30 bzw. 34 mm für Dezitextiter von 1,7, 3,3, 4,4, 6,7 bzw. 11 aufweisen,
dadurch gekennzeichnet, daß folgendermaßen vorgegangen wird:
a) in einer ersten Wasserdosis wird eine erste Dosis von ersten langen, geschlichteten Fasern in Suspension gebracht, und es wird eine erste Dosis eines ersten Polyelektrolyten mit hohem Molekulargewicht mit gleichen ionischen Eigenschaften wie die der hydrierten Schlichtung der ersten Fasern zugefügt, wobei der Gewichtsanteil des ersten Polyelektrolyten zwischen 0,2 und 0,5 % des Gewichts der ersten Fasern liegt;
b) nach Stabilisierung der gemäß a) erzeugten Suspension wird zu dieser eine zweite Wasserdosis hinzugefügt, dann eine zweite Dosis von zweiten langen Fasern, deren hydrierte Schlichtung die gleichen ionischen Eigenschaften hat wie die der ersten Fasern, und es wird ebenso eine zweite Dosis eines zweiten Polyelektrolyten mit hohem Molekulargewicht mit gleichen ionischen Eigenschaften wie die der hydrierten Schlichtung der zweiten Fasern hinzugefügt, wobei der kumulierte Gewichtsanteil des ersten und zweiten Polyelektrolyten bezüglich des kumulierten Gewichts der ersten und zweiten Fasern im gleichen Bereich bleibt wie der des ersten Polyelektrolyten bezüglich der ersten Fasern;
c) die Herstellung der Suspension mit langen Fasern wird bis zur n-ten fortgesetzt, indem zur kumulierten Suspension mit den (n-1)-ten ersten Fasern eine n-te Wasserdosis, dann eine n-te Dosis von n-ten langen Fasern, deren hydrierte Schlichtung die gleichen ionischen Eigenschaften wie die der (n-1)-ten Fasern aufweist, und indem eine n-te Dosis eines n-ten Polyelektrolyten mit hohem Molekulargewicht mit gleichen ionischen Eigenschaften wie die der hydrierten Schlichtung der (n-1)-ten Fasern hinzugefügt werden, wobei der kumulierte Gewichtsanteil der n Polyelektrolyten bezüglich des kumulierten Gewichts der n Fasern im gleichen Bereich bleibt wie der des ersten Polyelektrolyten bezüglich der ersten Fasern.
2. Verfahren zur industriellen Herstellung eines nicht-gewebten Produkts in Bahnform mittels einer Papierfertigungslinie auf Basis langer, geschlichteter Fasern, wobei diese Fasern eine Länge von mindestens 12, 18, 24, 30 bzw. 34 mm für Rezitestiter von 1,7, 3,3, 4,4, 6,7 bzw. 11 aufweisen,
dadurch gekennzeichnet, daß:
A) mit der Herstellung einer Kochung von Zellulosefasern begonnen wird, deren Gewichtsanteil an Fasern zwischen 2,5 und 4 % liegt und deren Tropfindex zwischen etwa 10 und 60 Grad Shopper liegt;
B) im übrigen eine Suspension von langen Fasern hergestellt wird, indem nach Anspruch 1 vorgegangen wird; und daß dann
C) die Kochung der Zellulosefasern in die Suspension der n langen Fasern gegeben wird und die resultierende Mischung einer Papiermaschine zugeführt wird.
3. Verfahren nach einem der Ansprüche 1 oder 2,
dadurch gekennzeichnet, daß die erwähnten langen Fasern gemäß den Vorgängen a), b) und c) von unterschiedlichen Naturen, Längen und Durchmessern sind.
4. Verfahren nach einem der Ansprüche 1 oder 2,
dadurch gekennzeichnet,
daß die erwähnten langen Fasern gemäß den Vorgängen a), b) und c) von gleicher Natur, aber von unterschiedlichen Längen und Durchmessern sind.
5. Verfahren nach einem der Ansprüche 1 bis 5,
dadurch gekennzeichnet,
daß die n Dosen Polyelektrolyt aus dem gleichen Produkt gebildet werden.
6. Verfahren nach einem der Ansprüche 1 bis 5 für lange Fasern mit hydrierter Schlichtung anionischer Art,
dadurch gekennzeichnet,
daß die Polyelektrolyt - Dosen aus wenigstens einer der folgenden Substanzen bestehen:
- Polyacrylamid-Harz
- Polyamidamin-Harz
- Polyamin-Harz
- Carboxyvinyl-Harz
- Polyäthylenamin-Harz
- modifiziertes Polyäthylenamin-Harz.
7. Verfahren nach einem der Ansprüche 2 bis 6,
dadurch gekennzeichnet,
daß kurze Fasern von unterschiedlichen Naturen den Zellulosefasern der Kochung beigemischt werden.
6. Verfahren nach Anspruch 2 und einem der Ansprüche 5 bis 7, in dem die Kochung von Zellulosefasern eine Behandlung auf Basis Polyelektrolyten erfährt,
dadurch gekennzeichnet,
daß wenigstens ein Polyelektrolyt in dieser Koch - Behandlung der gleiche ist wie der, bei der Herstellung der Suspension mit langen Fasern verwendete Polyelektrolyt mit hohem Molekulargewicht.
9. Verfahren nach einem der Ansprüche 1 bis 8,
dadurch gekennzeichnet,
daß bei der Herstellung der Suspension mit langen Fasern diese in abnehmender Reihenfolge bezüglich der Schwierigkeit, sie in Suspension zu bringen und zu halten, eingebracht werden.
EP85401922A 1984-10-05 1985-10-02 Nichtgewebtes langfaseriges Blatterzeugnis und sein Herstellungsverfahren Expired EP0177425B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85401922T ATE41794T1 (de) 1984-10-05 1985-10-02 Nichtgewebtes langfaseriges blatterzeugnis und sein herstellungsverfahren.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8415315A FR2571388B1 (fr) 1984-10-05 1984-10-05 Produit non tisse en feuille a fibres longues et son procede de realisation par voie papetiere
FR8415315 1984-10-05

Publications (2)

Publication Number Publication Date
EP0177425A1 EP0177425A1 (de) 1986-04-09
EP0177425B1 true EP0177425B1 (de) 1989-03-29

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP85401922A Expired EP0177425B1 (de) 1984-10-05 1985-10-02 Nichtgewebtes langfaseriges Blatterzeugnis und sein Herstellungsverfahren

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EP (1) EP0177425B1 (de)
AT (1) ATE41794T1 (de)
DE (1) DE3569135D1 (de)
FR (1) FR2571388B1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8621680D0 (en) * 1986-09-09 1986-10-15 Du Pont Filler compositions
DE9210235U1 (de) * 1992-07-30 1992-10-29 Ems-Inventa Ag, Zuerich, Ch
CN113201863B (zh) * 2021-04-06 2022-04-22 武汉纺织大学 一种医用防护服用吸附抗菌非织造布的制作装置及工艺

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2198232A (en) * 1938-11-15 1940-04-23 Shopneck Henry Philip Process of manufacturing a waterlaid felt
US3102838A (en) * 1960-02-23 1963-09-03 John A Manning Paper Company I Fiber treatment and resulting product
NL133247C (de) * 1967-05-18
DE2110599B2 (de) * 1971-03-05 1978-04-27 Schuller, Werner Hugo Wilhelm, 8022 Gruenwald Verfahren zur Herstellung eines Glasfaservlieses nach dem Naßvliesverfahren
US4129674A (en) * 1972-10-27 1978-12-12 Johns-Manville Corporation Fibrous mat especially suitable for roofing products and a method of making the mat
FR2410084A1 (fr) * 1977-11-23 1979-06-22 Arjomari Prioux Produit cellulosique, son procede de preparation et son application, notamment dans le domaine des panneaux de revetement en remplacement de l'amiante
US4245689A (en) * 1978-05-02 1981-01-20 Georgia Bonded Fibers, Inc. Dimensionally stable cellulosic backing web
FR2435554A1 (fr) * 1978-09-08 1980-04-04 Dalle & Lecomte Papeteries Produit papetier a forte teneur en charge
SU962399A1 (ru) * 1981-03-31 1982-09-30 Центральный научно-исследовательский институт бумаги Способ подготовки бумажной массы к отливу

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Publication number Publication date
ATE41794T1 (de) 1989-04-15
EP0177425A1 (de) 1986-04-09
DE3569135D1 (en) 1989-05-03
FR2571388A1 (fr) 1986-04-11
FR2571388B1 (fr) 1987-01-16

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