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
  • D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
  • D04H1/74—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being orientated, e.g. in parallel (anisotropic fleeces)
• • 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
  • D04H1/42—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 characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
  • D04H1/4326—Condensation or reaction polymers
  • D04H1/435—Polyesters
• • 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
  • D04H1/44—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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling
  • D04H1/46—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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
  • D04H1/492—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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres by fluid jet
• • 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
  • D04H1/44—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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling
  • D04H1/46—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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
  • D04H1/498—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 the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres entanglement of layered webs
• • 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
  • D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
  • D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged
  • D04H1/732—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged by fluid current, e.g. air-lay
• • 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
  • D04H18/00—Needling machines
  • D04H18/04—Needling machines with water jets

Definitions

• non-woven structures which, in general can be classified into three main categories, resulting from their very manufacturing process , namely non-woven fabrics called “dry”, “melted”, and non-woven fabrics called “wet”.
• the present invention relates to a new type of material obtained according to the first technique mentioned, namely, by "dry process”.
• a staple of fibers of predetermined grammage is formed from staple fibers, natural or chemical, by means of a carding or other textile preparation material, then subjected to a treatment allowing it to communicate the appropriate mechanical characteristics according to the uses for which the product is intended, for example a mechanical needling or interlacing treatment by fluid jets.
• the final properties of the product obtained can be adapted by making mixtures of materials, for example by combining together several webs made up of fibers of different nature, for example, natural fibers, artificial or synthetic.
• the invention relates to a new process making it possible to produce such a type of nonwoven article consisting of a mixture of fibers of different nature and which, in the following description will be designated by the expression "mixed nonwoven” .
• the product obtained has good mechanical strength characteristics, these characteristics being essentially provided by synthetic fibers as well as good absorption characteristics, these being imparted by cellulosic fibers.
• Such products are used in particular for making “wet wipes” designated in this technical sector by the English expression “baby wipes”, as well as in the field of hygiene, and also as wiping cloths.
• This type of mixed nonwoven is tending more and more to replace traditional nonwovens composed of a mixture of synthetic fibers (polyester, polypropylene) and artificial fibers (viscose), due in particular to its lower cost price, the fibers wood costing three to four times less than viscose fibers.
• the veil is asymmetrical in thickness, the artificial and synthetic fibers being arranged on one side of the veil and the natural fibers on the other side.
• devices such as spraying the natural fibers with softening chemical agents are used, but this does not completely make the defect disappear.
• the too low grammage of the first support layer does not allow it to act as a filtering medium for natural fibers during their deposition and then their intertwining with water jets. This results in a considerable loss of fibers, these being driven through the support fabric by the water jets, this loss in fibers considerably reduces the economic advantage of the process.
• the purpose of the present invention is to overcome the problems and drawbacks mentioned above, and to allow the production of an absorbent nonwoven, containing a large amount of natural fibers (wood pulp) having excellent properties. physical (tensile, tear, abrasion resistance) good absorption capacities and moreover having a pleasant feel similar to that of products based on artificial and / or synthetic fibers.
• the invention therefore relates to a process allowing the production of a new type of nonwoven consisting of a mixture of elementary fibers of different nature which consists, continuously:
• a first phase to consolidate the veil by action of a first series of water jets acting on one of its faces, the veil being supported by a drum comprising micro perforations;
• the first treatment with water jets will be carried out in accordance with the teachings of FR-A-2 730 246 and FR-A-2 734 285, the content of which is integrated into the present description as necessary.
• the second treatment by jets allowing the structuring of the web of synthetic and / or artificial fibers is, for its part, carried out using as coarse canvas supporting the web an openwork conveyor of the type as described in the
• the distribution of the cellulose fibers (wood fibers) on the surface of the veil of synthetic fibers can be carried out as well on the face which has been subjected to the action of the jets allowing the structuring of said sheet. only on the reverse side.
• the structuring treatment can be obtained as well by causing the second series of jets to act on the same face which has received the impact of the jets carrying out the consolidation action as on the face opposite to it.
• the invention also relates to a new type of nonwoven product obtained in particular by the implementation of this process.
• Such a mixed nonwoven which is made of a mixture of fibers of different nature, is characterized in that it consists of a sheet made from chemical fibers (artificial and / or synthetic) which has received a treatment bonding and reorientation of the fibers by means of water jets making it possible to have alternating zones of different porosities, natural fibers, wood in particular, being preferentially distributed inside the zones of high porosity, the cohesion of the whole being also obtained by entanglement thanks to the action of water jets.
• Figure 1 is a schematic view of an assembly of a production line for a complex material according to the invention, Figures la, lb, the being enlarged views of the circled areas of this Figure 1;
• Figure 2 is a schematic view, greatly enlarged, showing the structure of the first ply based on chemical fibers after consolidation treatment and structuring of the web;
• FIG. 3 is an enlarged schematic view of the mixed complex produced in accordance with the invention and,.
• Figure 4 is a schematic view of a variant of a production line for a material according to the invention.
• a nonwoven is made up of a mixture of elementary fibers of different nature in the following manner.
• a first veil (10) is made by artificial or synthetic fibers by carding or other similar technique (zone referenced there in FIG. 1).
• This veil (10) is then brought to a set of treatments (2) making it possible to bind it by means of water jets.
• This binding treatment consists, in a first phase in consolidating the web by the action of a first series of water jets (3) acting on one of the faces of said web, the latter being supported by a drum (4) with micro perforations.
• Such a binding assembly can be produced in accordance with teachings FR-A-2 730 246, and FR-A-2 734 285.
• the web (10) is transferred to a treatment unit (5) consisting either of a second perforated cylinder (25) or of an openwork conveyor allowing a structuring of the formed web.
• a treatment unit (5) consisting either of a second perforated cylinder (25) or of an openwork conveyor allowing a structuring of the formed web.
• the conveyor where the surface of the second cylinder are constituted by a coarse cloth of the type described in FR-A-2 741 895.
• the fibrous web (10) supported by the coarse fabric (11) is subjected to the action of water jets (12) which have an action such that the fibers of the veil (10) are separated from each other by said jets at the point of intersection of the strands of the fabric (11), which results in the formation of a veil (10a) having a three-dimensional organization of the fibers with zones of variable density where the structure of such a restructured veil being illustrated by FIG. 2, it can therefore be said that such a veil has zones (22) with a high density of fibers separated from each other by zones (21) with low density fiber.
• the structured veil (10a) is then brought to an assembly (6) making it possible to distribute on its surface fibers (14) of another nature and more particularly cellulose fibers (wood).
• Such an assembly (6) makes it possible to deposit said fibers by the technique known as "pneumatic lapping", the web (10a) (see FIG. 2a) being held on a conveyor belt (13) subjected to suction, the natural fibers , wood fibers, more particularly (14) being projected onto the surface of the web (10a) by means of an air current. Under the effect of the suction, said fibers therefore tend to deposit in the areas having the highest porosity, that is to say in the area (21) of FIG. (2) making it possible to form a complex as illustrated in FIG. 3 in which natural fibers - wood fibers - are deposited between artificial and synthetic fibers.
• the complex (20a) thus produced is then transferred to an assembly (7) making it possible to carry out a tangle treatment by water jets as illustrated in FIG.
• the mixed nonwoven obtained is then dried in (8) before being rolled up in a conventional manner in (9).
• FIG. 4 illustrates a variant in accordance with the invention which differs from that illustrated in FIG. 1 by the way in which the operation of structuring the sheet is carried out after the first treatment by jet of fluid in (4).
• the structuring operation by jets is carried out by causing the jets to act on the same face as that which had been previously treated.
• Example A product according to the invention is produced in the following manner.
• a 30 g / m2 veil composed of 40% viscose fibers of 38 mm and 1.7 dtex and 60% polyester fibers of 38 mm and 1.7 dtex is produced on a "random" type card at a speed of 110 m min.
• This veil is introduced on a hydraulic binding unit "Jetlace 2000" by means of a transport conveyor.
• the veil is compacted between this conveyor and a first binding cylinder coated with a micro-perforated envelope, the holes being arranged in a random manner as described in French patent 2,734,285. After compaction, the veil is pre-wetted by the 'via a ramp located behind the transport conveyor, just after the compaction point and arranged perpendicular to the generator of the cylinder.
• the veil thus compacted and wet is then subjected to the action of two hydraulic injectors projecting water jets of 120 microns in diameter at increasing speeds of 90 and 110 m / second the water jets being spaced from each other 1, 2 mm.
• the veil is then introduced on a conveyor equipped with a fabric consisting of 8.7 threads per cm of polyester 0.50 mm in diameter in the warp direction and 9.4 threads / cm of stainless steel of 0.38 mm diameter in the weft direction.
• Two hydraulic injectors are arranged above this conveyor. They project water jets of 120 microns in diameter at speeds of 100 m / second, the jets being spaced from each other by 0.5 mm.
• the veil is then expressed using a suction box connected to a vacuum generator.
• the product at the outlet of this conveyor has an embossed pyramid-like appearance with areas of different fiber density.
• the veil is then introduced on a pneumatic lapping machine, which deposits 30 g / m2 of cellulose fibers.
• the veil is introduced on another conveyor above which are arranged four hydraulic injectors projecting jets of water of 120 microns in diameter spaced from one another by 0.6 mm at speeds of 114 m /second.
• the veil is then expressed by a suction box connected to a vacuum generator and then dried by a through air cylinder at a temperature of 120 ° C and then rolled up.
• the feel of the product is excellent, it is difficult in particular to identify the respective faces (synthetic and cellulosic sides) finally the abrasion resistance both in the dry state and in the wet state is considerably improved , which results in an absence of salting out of the natural fibers.

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• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Nonwoven Fabrics (AREA)
• Peptides Or Proteins (AREA)
• Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)

Applications Claiming Priority (3)

Publications (2)

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ID=9529396

Family Applications (1)

Country Status (12)

Families Citing this family (38)

Family Cites Families (16)

• 1998
  • 1998-07-31 FR FR9810026A patent/FR2781818B1/fr not_active Expired - Fee Related
• 1999
  • 1999-06-15 EP EP19990928043 patent/EP1117860B1/de not_active Expired - Lifetime
  • 1999-06-15 WO PCT/FR1999/001425 patent/WO2000008245A1/fr not_active Ceased
  • 1999-06-15 JP JP2000563861A patent/JP2002522655A/ja not_active Withdrawn
  • 1999-06-15 AT AT99928043T patent/ATE225876T1/de not_active IP Right Cessation
  • 1999-06-15 KR KR1020017001194A patent/KR20010074783A/ko not_active Withdrawn
  • 1999-06-15 DK DK99928043T patent/DK1117860T3/da active
  • 1999-06-15 CN CN99809225A patent/CN1121520C/zh not_active Expired - Fee Related
  • 1999-06-15 ES ES99928043T patent/ES2183572T3/es not_active Expired - Lifetime
  • 1999-06-15 AU AU45175/99A patent/AU4517599A/en not_active Abandoned
  • 1999-06-15 DE DE69903462T patent/DE69903462T2/de not_active Expired - Fee Related
• 2001
  • 2001-01-09 US US09/756,842 patent/US6460233B2/en not_active Expired - Fee Related

Non-Patent Citations (1)

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