EP0282378B1 - Method for forming a non-woven web from synthetic filaments and conveying belt for applying the method - Google Patents

Method for forming a non-woven web from synthetic filaments and conveying belt for applying the method Download PDF

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Publication number
EP0282378B1
EP0282378B1 EP88400341A EP88400341A EP0282378B1 EP 0282378 B1 EP0282378 B1 EP 0282378B1 EP 88400341 A EP88400341 A EP 88400341A EP 88400341 A EP88400341 A EP 88400341A EP 0282378 B1 EP0282378 B1 EP 0282378B1
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Prior art keywords
filaments
cloth
synthetic filaments
forming
conveyor belt
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EP88400341A
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German (de)
French (fr)
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EP0282378A1 (en
EP0282378B2 (en
Inventor
Maurice Gauthier
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COFPA Compagnie des Feutres pour Papeteries et des Tissus Industriels SA
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COFPA Compagnie des Feutres pour Papeteries et des Tissus Industriels SA
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Application filed by COFPA Compagnie des Feutres pour Papeteries et des Tissus Industriels SA filed Critical COFPA Compagnie des Feutres pour Papeteries et des Tissus Industriels SA
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    • 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
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/005—Synthetic yarns or filaments
    • D04H3/009—Condensation or reaction polymers
    • 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
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/02—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments
    • 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
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
    • D04H3/16—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic filaments produced in association with filament formation, e.g. immediately following extrusion

Definitions

  • the present invention relates to a process for forming a nonwoven web of synthetic filaments in which the synthetic filaments are extruded, they are stretched, cooled, and projected onto a moving plastic canvas (SPUNBONDED and MELTBLOWN processes).
  • ramps of dies are used placed above a forming fabric.
  • Various polymers polymers (polyester, polyamide, polyolefins, etc.) are hot extruded.
  • the filaments are, using a violent current of air, stretched, cooled and projected onto the circular formation canvas which advances at constant speed.
  • a suction under the fabric eliminates the air and presses the veil against the fabric.
  • plastic forming fabrics which by their flexibility allow an easy installation and are easily guided, but it is not possible to clean them and their lifespan is therefore relatively short.
  • a special plastic forming cloth having a melting temperature t, at least 80 ° C. higher than the melting temperature of the filaments t 2 constituting the web, which makes it possible to clean the cloth by passage of a hot fluid (steam or hot air) at high speed whose temperature is between t 2 and t, and preferably chosen close to
  • the invention also relates to fabrics allowing the application of the method.
  • filaments of polymers polyolefins, etc. having a melting temperature t 2 of less than 200 ° C. will be used to form the veil.
  • a closed plastic cloth 1 is provided, mounted around rollers 2. Above the upper horizontal part of the cloth 1, there is a ramp 3 of extrusion dies surrounded by an air jet generator 4. The ramps 3 oriented vertically and over the entire width of the fabric 2 are used for the extrusion of synthetic filaments 5 which are projected by the air coming from the ramps 3 onto the fabric 1 in continuous movement to form a veil 6. The veil 6 is pressed against the fabric 1 by the suction of the air made by a device 7 arranged below the fabric 1.
  • a hot fluid steam or air
  • a device 8 placed in the vicinity of the fabric 1.
  • the temperature of this fluid is chosen to be close to t, being the melting point of the fabric and t 2 that of the filaments.
  • the material of the fabric 1 was chosen so that t, is at least 80 ° C. higher than the temperature t 2 .
  • the fabric 1 can be cleaned by melting the drops of material glued into the fabric 1 without the latter being damaged.
  • the fabrics 1 are made of warp and weft monofilaments in the form of single or multi-layer fabric. They are thermally stabilized according to the conditions of use.
  • the characteristics of the fabrics 1 are chosen (air permeability, weave, surface condition, etc.) as a function of the characteristics of the nonwoven web to be formed.
  • Their weight can be between 500 to 1500 gr / m2 and their permeability between 4000 to 25000 m3 / m2 / h under differential pressure of 100 Pascals.
  • These fabrics can be circular or with junctions. These can consist of loops at each end of the canvas. In this case, two series of loops of different lengths can advantageously be provided at each end as described in French patent n ° 7227942.

Abstract

Process for forming a nonwoven fleece (6) of synthetic filaments (5), in which the synthetic filaments (5) are extruded, stretched, cooled and applied to a moving plastic cloth (1), characterised in that the plastic cloth (1) is cleaned by passing through it a hot fluid at high speed which has a temperature of between the melting temperature t2 of the filaments (5) and the melting temperature t1 of the cloth (1) which is higher than that of the filaments (5) by at least 80 DEG C. <??>The cloth can consist, for example, of yarns of polyether ether ketone or yarns of polyphenylene sulphide. <??>The cloth is easy to fit and there is the possibility of cleaning it and therefore increasing its lifetime. <IMAGE>

Description

La présente invention a trait à un procédé de formation de voile non-tissé de filaments synthétiques dans lequel on extrude les filaments synthétiques, on les étire, les refroidit, les projette sur une toile plastique en mouvement (Procédés SPUNBONDED et MELTBLOWN).The present invention relates to a process for forming a nonwoven web of synthetic filaments in which the synthetic filaments are extruded, they are stretched, cooled, and projected onto a moving plastic canvas (SPUNBONDED and MELTBLOWN processes).

Pour l'application du procédé connu, on utilise des rampes de filières placées au-dessus d'une toile de formation. On extrude à chaud différents polymères (polyester, polyamide, polyoléfines, etc...). Les filaments sont, à l'aide d'un violent courant d'air, étirés, refroidis et projetés sur la toile de formation circulaire qui avance à vitesse constante. Une aspiration sous la toile permet d'éliminer l'air et de plaquer le voile contre la toile.For the application of the known method, ramps of dies are used placed above a forming fabric. Various polymers (polyester, polyamide, polyolefins, etc.) are hot extruded. The filaments are, using a violent current of air, stretched, cooled and projected onto the circular formation canvas which advances at constant speed. A suction under the fabric eliminates the air and presses the veil against the fabric.

Lors de la mise en route, on suite à des défauts de fonctionnement, il arrive que des gouttes de polymère en fusion tombent sur la toile et s'y incrustent. Cela dégrade la qualité du voile et entraîne parfois la dépose de la toile, car les filaments peuvent s'accrocher dans ces impuretés et le voile est mal formé si les zones bouchées sont trop grandes.During start-up, due to malfunctions, it happens that drops of molten polymer fall on the canvas and become embedded in it. This degrades the quality of the veil and sometimes leads to the removal of the canvas, because the filaments can get caught in these impurities and the veil is poorly formed if the blocked areas are too large.

Il est connu d'utiliser des toiles de formation en plastique, qui par leur souplesse permettent une mise en place facile et se guident facilement, mais il n'est pas possible de les nettoyer et leur durée de vie est donc relativement courte.It is known to use plastic forming fabrics, which by their flexibility allow an easy installation and are easily guided, but it is not possible to clean them and their lifespan is therefore relatively short.

On a donc pensé à utiliser des toiles métalliques malgré leur lourdeur, leur rigidité qui font qu'elles sont difficiles et longues à mettre en place, et qu'elles risquent, lors de ces opérations, de se plisser accidentellement.We therefore thought of using metal fabrics despite their heaviness, their rigidity which make them difficult and long to set up, and that they risk, during these operations, to crease accidentally.

En effet, ces toiles présentent l'intérêt de pouvoir être nettoyées relativement facilement en utilisant une source chaude à haute température (flammes).Indeed, these fabrics have the advantage of being able to be cleaned relatively easily using a hot source at high temperature (flames).

Selon la présente invention, on utilise une toile de formation en plastique spécial ayant une température de fusion t, supérieure d'au moins 80°C à la température de fusion des filaments t2 constituant le voile, ce qui permet de nettoyer la toile par passage d'un fluide chaud (vapeur ou air chaud) à grande vitesse dont la température est comprise entre t2 et t, et de préférence choisie voisine de

Figure imgb0001
According to the present invention, a special plastic forming cloth is used having a melting temperature t, at least 80 ° C. higher than the melting temperature of the filaments t 2 constituting the web, which makes it possible to clean the cloth by passage of a hot fluid (steam or hot air) at high speed whose temperature is between t 2 and t, and preferably chosen close to
Figure imgb0001

L'invention concerne également les toiles permettant l'application du procédé.The invention also relates to fabrics allowing the application of the method.

Ces toiles peuvent être en sulfide de polyphénylène (t, = 280°C) relativement peu coûteux. On utilisera dans ce cas pour former le voile des filaments de polymères (polyoléfines...) ayant une température de fusion t2 inférieure à 200°C.These fabrics can be made of relatively inexpensive polyphenylene sulfide (t, = 280 ° C.). In this case, filaments of polymers (polyolefins, etc.) having a melting temperature t 2 of less than 200 ° C. will be used to form the veil.

On peut également utiliser pour les toiles de polyéther éther cétone dont la température de fusion t, est de l'ordre de 330°C.Can also be used for polyether ether ketone fabrics whose melting temperature t, is of the order of 330 ° C.

Dans ce cas, on peut utiliser pour former le voile des filaments de polymères (polyester, polyamide...) dont la température de fusion est de l'ordre de 230°C.In this case, it is possible to use to form the veil of polymer filaments (polyester, polyamide, etc.) whose melting temperature is of the order of 230 ° C.

La présente invention sera mieux comprise à la lumière de la figure qui représente schématiquement les moyens de mise en oeuvre du procédé selon l'invention.The present invention will be better understood in the light of the figure which schematically represents the means for implementing the method according to the invention.

On prévoit une toile plastique 1 fermée, montée autour de rouleaux 2. Au-dessus de la partie horizontale supérieure de la toile 1, on dispose une rampe 3 de filières d'extrusion entourée par un générateur de jet d'air 4. Les rampes 3 orientées verticalement et sur toute la largeur de la toile 2 servent à l'extrusion de filaments synthétiques 5 qui sont projetés par l'air issu des rampes 3 sur la toile 1 en mouvement continu pourformer un voile 6. Le voile 6 est plaqué sur la toile 1 par l'aspiration de l'air faite par un dispositif 7 disposé en-dessous de la toile 1.A closed plastic cloth 1 is provided, mounted around rollers 2. Above the upper horizontal part of the cloth 1, there is a ramp 3 of extrusion dies surrounded by an air jet generator 4. The ramps 3 oriented vertically and over the entire width of the fabric 2 are used for the extrusion of synthetic filaments 5 which are projected by the air coming from the ramps 3 onto the fabric 1 in continuous movement to form a veil 6. The veil 6 is pressed against the fabric 1 by the suction of the air made by a device 7 arranged below the fabric 1.

Lorsque le voile a quitté la toile de formation 1, on projette un fluide chaud (vapeur ou air) à grande vitesse par un dispositif 8 disposé au voisinage de la toile 1. La température de ce fluide est choisie voisine de

Figure imgb0002
t, étant la température de fusion de la toile et t2 celle des filaments. On a choisi la matière de la toile 1 de façon que t, soit supérieure d'au moins 80°C à la température t2.When the veil has left the forming fabric 1, a hot fluid (steam or air) is projected at high speed by a device 8 placed in the vicinity of the fabric 1. The temperature of this fluid is chosen to be close to
Figure imgb0002
 t, being the melting point of the fabric and t 2 that of the filaments. The material of the fabric 1 was chosen so that t, is at least 80 ° C. higher than the temperature t 2 .

Ainsi la toile 1 peut être nettoyée en faisantfondre les gouttes de matière collée dans la toile 1 sans que celle-ci soit endommagée. Les toiles 1 sont constituées de monofilaments en chaîne et en trame sous forme de tissu simple ou multicouches. Elles sont stabilisées thermiquement en fonction des conditions d'emploi.Thus the fabric 1 can be cleaned by melting the drops of material glued into the fabric 1 without the latter being damaged. The fabrics 1 are made of warp and weft monofilaments in the form of single or multi-layer fabric. They are thermally stabilized according to the conditions of use.

On choisit les caractéristiques des toiles 1 (perméabilité à l'air armure, état de surface...) en fonction de caractéristiques du voile non-tissé à former.The characteristics of the fabrics 1 are chosen (air permeability, weave, surface condition, etc.) as a function of the characteristics of the nonwoven web to be formed.

Leur poids peut se situer entre 500 à 1500 gr/m2 et leur perméabilité entre 4000 à 25000 m3/m2/h sous pression différentielle de 100 Pascals.Their weight can be between 500 to 1500 gr / m2 and their permeability between 4000 to 25000 m3 / m2 / h under differential pressure of 100 Pascals.

Ces toiles peuvent être circulaires ou avec jonctions. Celles-ci peuvent être constituées de boucles à chaque extrémité de la toile. Dans ce cas, on peut prévoir avantageusement à chaque extrémité deux séries de boucles de longueurs différentes comme décrit dans le brevet français n°7227942.These fabrics can be circular or with junctions. These can consist of loops at each end of the canvas. In this case, two series of loops of different lengths can advantageously be provided at each end as described in French patent n ° 7227942.

Claims (4)

1. Method of cleaning a conveyor belt used to form a non-woven web from synthetic filaments in which the synthetic filaments are extruded, stretched, cooled and projected onto the moving plastics material conveyor belt (1) which has a melting point (ti) at least 80°C higher than the melting point t2 of the filaments, in which method the plastics material conveyor belt is cleaned by passing through it at high speed a hot fluid at a temperature between t, and t2.
2. Cleaning method according to claim 1 characterised in that the conveyor belt is made from monofilaments of polyether ether ketone or polyphenylene sulphide.
3. Plastics material conveyor beltforforming non-woven webs characterised in that it is made from monofilaments of polyether ether ketone.
4. Plastics material conveyor belt for forming non-woven webs characterised in that it is made from monofilaments of polyphenylene sulphide.
EP88400341A 1987-02-27 1988-02-16 Method for forming a non-woven web from synthetic filaments and conveying belt for applying the method Expired - Lifetime EP0282378B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8702674A FR2611754B1 (en) 1987-02-27 1987-02-27 PROCESS FOR FORMING NONWOVEN WEB OF SYNTHETIC FILAMENTS AND PLASTIC CANVAS FOR APPLYING THIS METHOD
FR8702674 1987-02-27

Publications (3)

Publication Number Publication Date
EP0282378A1 EP0282378A1 (en) 1988-09-14
EP0282378B1 true EP0282378B1 (en) 1991-12-27
EP0282378B2 EP0282378B2 (en) 1995-07-05

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EP88400341A Expired - Lifetime EP0282378B2 (en) 1987-02-27 1988-02-16 Method for forming a non-woven web from synthetic filaments and conveying belt for applying the method

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US (1) US4943327A (en)
EP (1) EP0282378B2 (en)
JP (1) JP2547338B2 (en)
KR (1) KR940011592B1 (en)
AT (1) ATE70862T1 (en)
CA (1) CA1290520C (en)
DE (1) DE3867092D1 (en)
DK (1) DK164124C (en)
ES (1) ES2028307T5 (en)
FI (1) FI87661C (en)
FR (1) FR2611754B1 (en)
GR (1) GR3003563T3 (en)
ZA (1) ZA881387B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030208886A1 (en) * 2002-05-09 2003-11-13 Jean-Louis Monnerie Fabric comprising shaped conductive monofilament used in the production of non-woven fabrics
KR20070113232A (en) * 2005-03-18 2007-11-28 디올렌 인두스트리알 피베르스 베.파우. Process for producing polyphenylene sulfide filament yarns
CN102677395A (en) * 2012-05-21 2012-09-19 王月华 Non-woven silk fabric and preparation method thereof
CN114474911B (en) * 2022-04-06 2022-07-05 保定龙军建材有限公司 Anti-skid plastic woven cloth and preparation method thereof

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1484681A (en) * 1974-01-09 1977-09-01 Jwi Ltd Guide shower for a paper making machine
BR7901293A (en) * 1978-03-04 1979-10-09 Vepa Ag PROCESS AND DEVICE FOR CONTINUOUS WASHING OF TEXTIL MATERIAL IN PIECE FORM
JPS5668152A (en) * 1979-11-01 1981-06-08 Toa Nenryo Kogyo Kk Nonwoven fabric
US4359501A (en) * 1981-10-28 1982-11-16 Albany International Corp. Hydrolysis resistant polyaryletherketone fabric
US4548856A (en) * 1983-05-16 1985-10-22 Kimberly-Clark Corporation Method for forming soft, bulky absorbent webs and resulting product
US4488928A (en) * 1983-05-16 1984-12-18 Kimberly-Clark Corporation Method and apparatus for forming soft, bulky absorbent webs and resulting product
JPS6040491U (en) * 1983-08-29 1985-03-22 日本無機株式会社 Fiber plate forming device
US4643775A (en) * 1984-06-29 1987-02-17 Crown Zellerbach Corporation Fabric conditioning and cleaning system

Also Published As

Publication number Publication date
JP2547338B2 (en) 1996-10-23
EP0282378A1 (en) 1988-09-14
DE3867092D1 (en) 1992-02-06
FR2611754A1 (en) 1988-09-09
DK103088A (en) 1988-08-28
KR880010172A (en) 1988-10-07
ATE70862T1 (en) 1992-01-15
FI880864A0 (en) 1988-02-24
FI880864A (en) 1988-08-28
FI87661B (en) 1992-10-30
JPS63227855A (en) 1988-09-22
CA1290520C (en) 1991-10-15
GR3003563T3 (en) 1993-03-16
ES2028307T3 (en) 1992-07-01
KR940011592B1 (en) 1994-12-22
DK164124B (en) 1992-05-11
ZA881387B (en) 1988-08-26
ES2028307T5 (en) 1995-11-01
DK103088D0 (en) 1988-02-26
FI87661C (en) 1993-02-10
FR2611754B1 (en) 1989-05-05
US4943327A (en) 1990-07-24
EP0282378B2 (en) 1995-07-05
DK164124C (en) 1992-10-05

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