EP0725855B1 - Latex modifie - Google Patents

Latex modifie Download PDF

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Publication number
EP0725855B1
EP0725855B1 EP94930945A EP94930945A EP0725855B1 EP 0725855 B1 EP0725855 B1 EP 0725855B1 EP 94930945 A EP94930945 A EP 94930945A EP 94930945 A EP94930945 A EP 94930945A EP 0725855 B1 EP0725855 B1 EP 0725855B1
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EP
European Patent Office
Prior art keywords
product
latex
binder solution
binder
fibrous
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
EP94930945A
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German (de)
English (en)
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EP0725855A1 (fr
Inventor
Karl Kristian Kobs Kroyer
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.)
Kobs Houlberg Vibeke
Kobs Kroyer Ingelise
Original Assignee
Kobs Houlberg Vibeke
Kobs Kroyer Ingelise
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Publication date
Application filed by Kobs Houlberg Vibeke, Kobs Kroyer Ingelise filed Critical Kobs Houlberg Vibeke
Publication of EP0725855A1 publication Critical patent/EP0725855A1/fr
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Publication of EP0725855B1 publication Critical patent/EP0725855B1/fr
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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
    • 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

Definitions

  • This invention concerns a method for production of a binder solution making it possible to produce a softer and stronger air-laid product having groups of fibers bonded to other fibers and other groups of fibers.
  • the soft and silky effect is obtained through a modification of the binder making it possible to reduce the amount of binder and easy to effect a neutralizing or at least a partly neutralizing of the brittle bonds which normally is provided in the form of cellulosic hydrogen bonds and/or casein bonds.
  • the binder solution When applying the binder solution a combination of brittle hydrogen bonds and elastic bonds are necessarily provided together.
  • the hydrogen bonds are valuable in a fibrous product although they are generally an irritation to the human skin.
  • the hydrogen bonds are not brittle when they only stay in small groups of few fiber-agglomerations or between single fibers. These hydrogen bonds make the overall product stronger.
  • due to the brittleness of the hydrogen bonds the fibrous product would appear as a rather stiff web having a poor hand and feel. Also the drapability would be poorer than wanted.
  • the elastic latex bonds are valuable. However, since the latex is applied in a suspension of water, therefore accordingly, a hydrogen bond would also be provided together with a latex bond.
  • a method as described in claim 1 wherein a modification of the binder solution is effected by introducing a softener product into the binder suspension before its application onto the fibrous product.
  • a softener product e.g. in the form of a SBR latex product into the fibrous product makes it possible to reduce the amount of binder and simultaneously it is possible to obtain a product which, after a following mechanical neutralization of the hydrogen bonds, is more soft and silky and stronger.
  • all the advantages obtained by the mechanical neutralization is also obtained in a product according to the present invention, however, surprisingly the product will occur even more soft and silky than normal and also stronger than normal.
  • a hydrogen bond is irritating to the skin as a dry formed product consists of fibers arranged in groups in contact with or in connection with the other groups of fibers, then the product will result as a product being stronger than a product having only single fibers being in mutually contact or connection with other single fibers. Accordingly, a product having small groups of fibers being interconnected through the hydrogen bonds will not only be softer but also become stronger. This is due to the fact that the groups will be interconnected by latex bonds which are not interrupted with the mechanical method described below.
  • Hydrogen bond is unavoidable because the latex solution is suspended in so much water that the hydrogen bond is all over and through the dry formed product. According to this invention the hydrogen bond will remain in very small areas or islands which have not been subjected to the neutralization stretching process. Thus the strongly coherence of the product will be maintained in said areas or islands and in the connected islands.
  • the neutralization is effected by stretching the product at least in two directions, however, also a stretching in three or four directions is possible. Thereby flexibility lines are established in the bonds. Thus a more or less randomly orientated pattern is obtained in which the hydrogen bonds have been flexible in mini lines. However, due to the elasticity the latex bonds even after the stretched product, the product will all over have a latex bond. With this method an advantageous product is obtained having groups of interconnected fiber groups instead of single fibers. The final product will be soft in quality, be strong and have a good hand and feel and a good drapability.
  • the modified SBR latex is used after a whipping process.
  • the latex product is mixed intimately into the solution thereby ensuring a good distribution of the product through the fibrous product.
  • blown castor oil is added to the SBR latex binder.
  • the whipping process is advantageous, because it is an oxidation of the castor oil which hereby will be blown.
  • blown castor oil is advantageous in connection with a Styrene-Butadiene Rubber. It is preferred to add between 0.5 % and 1% by weight of the blown castor oil to the latex dry substance.
  • the SBR latex product may be provided with milk which has given surprisingly good results.
  • milk having a content of fat of between 8 to 15% by weight, preferably having a content of fat of 10% by weight.
  • Such milk will also comprise casein.
  • the casein could occur in an amount of 2 to 3% by weight in the milk.
  • the casein will also provide good, however, brittle bonds. These brittle bonds may be compared with the hydrogen bonds and would make the product strong.
  • casein is insoluble in water.
  • the casein bonds will be neutralized to the extent wanted together with the neutralization of the hydrogen bonds by the stretching of the product. It is believed that by stirring/whipping in an oxygen containing air, as normal air, or with little peroxide, the fat in the milk might be changed to a sort of blown oil.
  • a Styrene-Butadiene Rubber latex it is advantageous to add between 2 to 5 % by weight of natural latex in order to make the latex more elastic, and thereby making it possible to obtain a higher degree of stretching.
  • a more fine pattern of invisible neutralization lines is obtained.
  • a mini-mosaic is obtained in which each of the mosaic sections contain small groups of fibers being interconnected by the hydrogen bonds and possibly also the casein bonds. Said sections being separated by a fine network of lines in which the hydrogen bonds and possible also the casein bonds, if any, are neutralized or released from their tension. Thereby a very strong and very soft product is obtained.
  • EP-A-0 373 276 an apparatus is disclosed which comprises means for applying a binder solution onto a fibrous product and means for homogenisation of the binder solution before this solution is introduced into the nozzles.
  • this apparatus does not discloses any separate means for such softener product.
  • the invention concerns also an apparatus as described in claim 9, for producing a soft and silky air-laid fibrous product which includes forming means for dry-laying a fibrous web on a forming wire positioned on a suction means, applicator means for applying a binder mixture onto the fibrous web so as to form brittle and elastic bonds in the fibrous web.
  • This apparatus makes it possible to add the softener product to the binder solution in the mixing means.
  • the mixing means are preferably whipping means which make it possible to obtain an intimate mixing.
  • FIG. 1 Preferred embodiments for an apparatus according to the present invention is diagrammatically illustrated in Figs. 1-3. In these Figures identical or corresponding elements are designated with same reference numbers and will only be explained in details in connection with Fig. 1.
  • the apparatus includes a fiber distributor 1, a suction box 2, and an endless foraminous forming wire 3 passing there between the endless forming wire consisting e.g. of a mesh net constructed using bronze wires.
  • the forming wire 3 is driven by suitable means (not shown) so that it will continuously pass between the distributor 1 and the suction box 2.
  • the forming wire 3 moves in direction of an arrow 4.
  • the suction box 2 includes a suction pipe 5 which is connected to a fan (not shown) for the creation of a vacuum therein.
  • the forming wire 3 passes through the nip of a pair of rollers 6,7 and below a nozzle 8 spraying a binder solution onto the product formed.
  • the nozzle 8 is connected with a mixing box 10 according to the invention.
  • the mixing box 10 is connected with supplying means 11 and 12.
  • An endless band 13 is arranged in continuation of the forming wire 3.
  • the band 13 is driven in direction of the arrow 14.
  • a further endless band 15 is provided above the forming wire 3 and the endless band 13.
  • the endless band 13 is a gas permeable band wounded on three rollers 16, 17, and 18. From the roller 17 a wall 19 is provided, thereby dividing the interior space of the gas permeable band 15 into two compartments 20 and 21.
  • a vacuum is created through a fan (not shown), thereby lifting the fibrous product 22 free of the forming wire 3.
  • an overpressure is created e.g. by means of the same fan which creates the vacuum in compartment 20. Thereby, the fibrous product 22 is transferred and deposited onto the endless band 13.
  • the apparatus also comprises two sets of rollers 23,24 and 25,26, respectively, and a further nozzle 8 which is mounted between said sets of rollers and to which a binder solution is supplied from the mixing box 10.
  • the rollers 24 and 26 may preferably be heated rollers.
  • the apparatus comprises a drying unit 27, a stretching unit 28, a curing unit 29, and a roller 30 for winding the final product.
  • the stretching unit 28 shown in Fig. 1 comprises a series of four bombarded rollers 31. Between the bombarded rollers 31 turning and tightening rollers 32 are provided. The turning and tightening rollers 32 are movable along the arrows 33 in order to urge the fibrous product 22 against the bombarded rollers 31 with different forces, thereby effecting different degrees of stretching.
  • the apparatus illustrated in Figs. 2 and 3 differs only from the apparatus illustrated in Fig. 1 by the use of other stretching units 28.
  • the stretching unit in Fig. 2 comprises a single roller 34 having a surface provided with small protuberances thus providing a surface which corresponds to the surface known from a corncob, however, each protuberance is much smaller as compared to a corngrain.
  • the stretching unit 28 comprises two turning and tightening rollers 35 being movable along arrows 36 in order to urge the fibrous product 22 against the roller 34 with different forces thereby effecting different degrees of stretching.
  • the stretching unit 28 illustrated in Fig. 3 comprises a series of four rollers 37 and 38.
  • the rollers 37 and 38 comprise a left hand thread and a right hand thread, respectively.
  • the fibrous product 22 is led according to a sine-formed path through the series of rollers 37,38 alternately being urged into contact with a left hand thread and a right hand thread, thereby establishing a stretch as the fibrous product 22 is urged against the rollers 37,38 in a tightened manner.
  • the threads provided on the rollers 37,38 are rounded, thereby allowing the fibrous product 22 to slide on the top of the threads.
  • the forming wire 3 When the forming wire 3 is advanced in the above-mentioned path a fiber material is deposited on the forming wire 3 on which it is moved in direction of arrow 4 and forms a fiber layer when air is sucked away through the suction box 2.
  • the fiber layer thus formed is rolled when passing the nip of the rollers 6,7.
  • the binder material and the softener product is mixed in the mixing box 10.
  • the binder solution 9 manufactured according to the invention is the applied to one side of the layer by means of the nozzle 8.
  • the product thus formed has such a strength that it can be removed from the forming wire 3 by means of the gas permeable endless band 15. Due to the vacuum in the chamber 20 the fibrous product 22 is lifted free of the forming wire 3 and is then deposited onto the band 13 due to the overpressure in the compartment 21.
  • the fibrous product 22 is then passed through the set of rollers 23,24 and passes the nozzle 28 at which a binder solution 9 is applied on the side of the product facing downwards on the forming wire 3.
  • a drying unit 27 When the material has passed the set of rollers 25,26 it is led through a drying unit 27.
  • the rollers 24 and 26 are preferably heated so as to remove a part of the moisture supplied together with the binder solution. Thus is might be possible to obviate a use of a separate drying unit 27.
  • the fibrous product 22 After having passed through the drying unit 27 the fibrous product 22 is led through the stretching unit 28 in which the product is stretched at least in two directions. The effect on the stretching would be explained in more detail below. Before the product 22 is wound on the roller 30 it is led through a curing unit 29.
  • the nozzles 8 are provided with a binder solution from a mixing box 10.
  • the mixing box 10 comprises preferably mixing means in order to effect an intimate mixing by a whipping process.
  • the product to be mixed in the mixing box 10 is provided from supply means 11 and 12.
  • the supply means 12 contain a latex binder which preferably is a SBR latex binder in an aqueous suspension which is known in the art. It is noted that it is also possible to use other binders which are well-known in the art.
  • the latex binder solution is modified by introducing a softener product from the supply means 11.
  • the introduction of a softener product into the latex binder suspension has given surprisingly improvements in the qualities of the final product obtained in that it is more soft and silky and also stronger than normal after the stretching operation effecting in the stretching unit 28.
  • the softener product is blown castor oil which is whipped into a SBR latex binder solution.
  • the whipping process is advantageously because of the oxidation of the castor oil which thereby is blown. It is preferred to add between 0.5 % and 1 % by weight of the blown castor oil to a SBR latex dry substance.
  • the softener product is milk having a content of fat between 8 to 15% by weight, preferably a content of fat of 10% by weight.
  • a content of fat between 8 to 15% by weight, preferably a content of fat of 10% by weight.
  • between 2 to 5% of natural latex is added to SBR latex in order to obtain a more elastic latex, and thereby making it possible to obtain a higher degree of stretching.
  • Such higher degree of stretching in the stretching unit 28 will provide a more fine pattern of mini-mosaic lines in which the hydrogen bonds are neutralized as explained above.
  • the modification of the latex binder solution is essential in order to obtain the soft and silky product which is provided according to the present invention.
  • the stretching unit 28 comprises bombarded rollers 31 which are well-known. However, so far bombarded rollers 21 have been used for smoothening a fibrous product.
  • the fibrous product 22 is urged against the bombarded rollers 31 through the influence from the turning and tightening rollers 32, thereby applying the fibrous product 22 onto the rollers 31 with a force sufficient to effect a stretching.
  • each succeeding bombarded roller is driven with a higher surface velocity than a previous roller 31 in order to effect a stretching in the longitudinal direction of the product 22. Due to the stretching it is possible to obtain a fine pattern of invisible neutralization lines to be explained below.
  • roller 34 may be followed by one or more bombarded rollers for effecting a smoothening.
  • the roller 34 might have protuberances having a height of between 2 mm and 3 mm and having a mutual distance between protuberances of between 5 mm and 20 mm.
  • the thread is formed by a sine-shaped surface of the roller in which each sine-wave has a height of between 5 and 10 mm and having a mutual distance between the waves of between 10 and 15 mm.
  • the roller may have a diameter of between 0.4 and 0.6 m. The same diameters could also be used for the rollers 31 and 34.
  • Fig. 4 a fragmentary enlarged view of a fibrous product 22 is illustrated. It is seen that the single fibers 39 are distributed with a normal air-forming distribution of the fibers 39 in all positions and with hydrogen bonds and latex bonds at cross-linking points of the individual fibers.
  • Fig. 5 illustrates greatly enlarged a fibrous product 22 corresponding to that illustrated in Fig. 2, however, treated with a modified latex binder and subjected to a stretching process as described above.
  • a mosaic of lines 41 is illustrated separating the product in mosaic sections 42 in which the hydrogen bonds are maintained.
  • the brittle hydrogen bonds and casein bonds are neutralized whereas the elastic latex bonds are maintained even after the stretching of the product 22.
  • the product will all over its surface maintain the latex bonds.
  • the product is obtained having groups of interconnected fibers 39 in the mosaic sections 42 when said groups of fibers are interconnected with other groups of fibers or single fibers through the latex bonds. Accordingly, a final product is obtained having a good hand and feel and a good drapability.
  • Fig. 6 the mosaic pattern of the lines 41 is illustrated without the illustration of the fibers 39. This is only for illustrative reasons as the lines 41 would be invisible in the final product even if it is studied through a three-dimensional microscope.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)

Claims (10)

  1. Procédé pour la production d'une solution liante qui rend possible la fabrication d'un produit fibreux mou et soyeux, appliqué en couche par jet d'air, qui a des fibres et des groupes de fibres reliés à d'autres fibres et à d'autres groupes de fibres au fur et à mesure que la solution liante est appliquée au produit fibreux, caractérisé en ce qu'un adoucissant est mélangé à la solution liante avant son application sur le produit fibreux.
  2. Procédé selon la revendication 1, caractérisé en ce que la solution liante est un liant au latex contenu dans une suspension aqueuse, et en ce que l'adoucissant est mélangé à la suspension aqueuse selon un procédé de fouettement.
  3. Procédé selon la revendication 2, caractérisé en ce que le liant au latex est à base de latex de caoutchouc de styrène-butadiène (SBR), et en ce qu'on ajoute 2 à 5 % en poids de latex naturel au lait de latex de SBR.
  4. Procédé selon la revendication 3, caractérisé en ce qu'on ajoute, 0,5 à 1 % en poids d'huile de ricin soufflée, par rapport à la substance sèche de latex de SBR, au lait de latex de SBR.
  5. Procédé selon la revendication 4, caractérisé en ce qu'on ajoute lentement l'huile de ricin soufflée au lait de latex de SBR, et en ce qu'on effectue un fouettement simultané de la solution liante.
  6. Procédé selon la revendication 1, caractérisé en ce que le produit gras est un lait qui a une teneur en matière grasse comprise entre 8 et 15 % en poids, de préférence entre 9 et 11 % en poids.
  7. Procédé selon la revendication 6, caractérisé en ce que le lait est ajouté en fouettant simultanément la solution dans de l'air contenant de l'oxygène.
  8. Procédé selon la revendication 6, caractérisé en ce que le lait est ajouté avec un peu de peroxyde en fouettant simultanément la solution liante.
  9. Appareil pour produire un produit fibreux mou et soyeux, appliqué en couche par jet d'air, qui comprend des moyens de façonnage pour appliquer en couche à sec une bande continue fibreuse sur un fil métallique de façonnage (3) placé sur des moyens d'aspiration (2), des moyens d'application (8) pour appliquer un mélange liant (9) sur la bande continue fibreuse, caractérisé en ce que ledit appareil comprend des moyens de mélange (10) pour former un mélange (9) de solution liante et d'un adoucissant, des moyens d'acheminement pour acheminer le mélange (9) des moyens de mélange (10) aux moyens d'application (8), et des moyens d'alimentation (11, 12) pour fournir séparément une solution liante et un adoucissant auxdits moyens de mélange (10).
  10. Appareil selon la revendication 9, caractérisé en ce que lesdits moyens de mélange (10) comprennent des moyens de fouettement pour fouetter un produit graisseux dans la solution liante.
EP94930945A 1993-10-28 1994-10-28 Latex modifie Expired - Lifetime EP0725855B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US14213293A 1993-10-28 1993-10-28
US142132 1993-10-28
PCT/DK1994/000404 WO1995012030A1 (fr) 1993-10-28 1994-10-28 Latex modifie

Publications (2)

Publication Number Publication Date
EP0725855A1 EP0725855A1 (fr) 1996-08-14
EP0725855B1 true EP0725855B1 (fr) 1997-09-17

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EP94930945A Expired - Lifetime EP0725855B1 (fr) 1993-10-28 1994-10-28 Latex modifie

Country Status (7)

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EP (1) EP0725855B1 (fr)
AT (1) ATE158360T1 (fr)
AU (1) AU7990794A (fr)
CA (1) CA2175240C (fr)
DE (1) DE69405770D1 (fr)
DK (1) DK0725855T3 (fr)
WO (1) WO1995012030A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111070720B (zh) * 2019-12-31 2021-12-17 中国人民解放军国防科技大学 一种纤维增强复合材料纤维位置控制装置和方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0373276A1 (fr) * 1987-11-04 1990-06-20 Ogilvie Aquitaine S.A. Procédé et dispositif de pulvérisation continue d'adjuvants sur des produits perméables en bande lors de leur défilement

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL6917625A (fr) * 1968-12-16 1971-05-25
DK439282A (da) * 1981-10-05 1983-04-06 James River Dixie Northern Inc Hoejabsorberende stribet fibervare samt fremgangsmaade til dens fremstilling

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0373276A1 (fr) * 1987-11-04 1990-06-20 Ogilvie Aquitaine S.A. Procédé et dispositif de pulvérisation continue d'adjuvants sur des produits perméables en bande lors de leur défilement

Also Published As

Publication number Publication date
AU7990794A (en) 1995-05-22
WO1995012030A1 (fr) 1995-05-04
DK0725855T3 (da) 1998-05-04
CA2175240C (fr) 1999-02-23
EP0725855A1 (fr) 1996-08-14
CA2175240A1 (fr) 1995-05-04
DE69405770D1 (de) 1997-10-23
ATE158360T1 (de) 1997-10-15

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