US3591407A - Bonded non-woven fabric - Google Patents

Bonded non-woven fabric Download PDF

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Publication number
US3591407A
US3591407A US758387A US3591407DA US3591407A US 3591407 A US3591407 A US 3591407A US 758387 A US758387 A US 758387A US 3591407D A US3591407D A US 3591407DA US 3591407 A US3591407 A US 3591407A
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US
United States
Prior art keywords
binder
fabric
flame
fleece
impregnated
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
US758387A
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English (en)
Inventor
Peter Petersik
Adolf Graber
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.)
Carl Freudenberg KG
Original Assignee
Carl Freudenberg KG
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Filing date
Publication date
Application filed by Carl Freudenberg KG filed Critical Carl Freudenberg KG
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Publication of US3591407A publication Critical patent/US3591407A/en
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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
    • D04H1/40—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
    • D04H1/48—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 in combination with at least one other method of consolidation
    • D04H1/488—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 in combination with at least one other method of consolidation in combination with bonding agents
    • 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
    • D04H1/645—Impregnation followed by a solidification process
    • 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
    • D04H1/655—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 characterised by the apparatus for applying bonding agents
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/20—Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
    • Y10T442/2033—Coating or impregnation formed in situ [e.g., by interfacial condensation, coagulation, precipitation, etc.]

Definitions

  • This invention relates to nonwoven fabrics. It more particularly refers to such fabrics having coagulated binders.
  • Nonwoven fabrics are well known. It is also known to be desirable to provide binders in such nonwoven fabrics whereby to render such fabrics substantially dimensionally stable. It has been considered desirable to utilize a rubber (natural or synthetic) or a synthetic resin as the binder. Such binder has been introduced into the nonwoven fabric by impregnation thereof in the form of a solution, suspension, dispersion or emulsion. It is also known to utilize and impregnate the binder into the fabric in foam form. The most common impregnant used today is the latex.
  • Evaporation of the liquid medium will usually tend to cause the binder to migrate towards the surfaces of the fabric, with the result that there may be too little binder in the centre of the fabric, with the risk that the fabric may delaminate.
  • binder migration can be reduced if the binder is caused to coagulate out in the fleece from the liquid medium, before evaporating that medium.
  • the impregnation medium is generally chosen so as to be heat coagulatable, that is to say coagulation occurs on heating the medium to, for example, 60 C.
  • coagulation occurs on heating the medium to, for example, 60 C.
  • This heating is therefore conducted as rapidly as possible, generally by infrared heaters. Even with infrared, however, heating is not as rapid as desirable and some migration almost inevitably does occur,
  • one aspect of this invention resides in the use of an open, hot flame 3,591 ,407 Patented July 6, 1971 in direct contact with a nonwoven fabric in order to coagulate at least a substantial portion of a coagulatable binder impregnated therein.
  • FIG. 1 is an elevation schematic view of one embodiment of this invention.
  • FIG. 2 is similar to FIG. 1 showing an alternate embodiment.
  • coagulation of the binder is achieved by heating the fleece through contact thereof with at least one hot flame to a temperature such that coagulation of the binder occurs but that sorching of the fabric does not occur.
  • hot flame refers to any flame that results from normal burners, such as gas burners of the conventional type, and which has a flame temperature of several hundred degrees centigrade, or higher.
  • the specific temperature of the flame is not critical but it is preferably at least about C.
  • FIG. 1 there is shown a fleece 1 being impregnated with a suitable binder by passing between a pair of rollers 2 and 3 one of which serves to apply impregnant 4 to the fabric.
  • the impregnated fabric 5 then passes in contact with a series of flames 6 and thence onto a transfer plate 7 and into a drying and vulcanizing oven 8.
  • FIG. 2 is very similar to FIG. 1 but shows a vertical pass through the flames.
  • the fabric may be moving in any desired direction at the time of contact. For example it may be moving vertically, horizontally or at some angle therebetween.
  • the fabric may, and generally is, unsupported while it is being contacted with the flame.
  • the disadvantages that occurred previously when the unsupported fabric was subjected to infrared radiation are substantially avoided or at least minimized in the process of the invention for two reasons. Firstly, the rapid coagulation rapidly gives increased strength to the fabric so that there is less risk of sagging. Secondly, the rapid coagulation allows the distance over which the fabric has to pass unsupported to be very much less than was necessary when infra red radiation was used.
  • the binder generally had not been coagulated sufliciently to give sufficient stability to the fabric to prevent distortion during the squeezing.
  • the liquid medium still contained dissolved or suspended therein a considerable amount of binder, and this would have been squeezed out at the same time as the liquid medium.
  • a fiber fleece consisting of:
  • Percent Rayon fibres 20 Nylon fibres 70 Wool is prepared by carding.
  • the fleece has a weight of 5.5 ounces per square yard and a specific gravity of 0.0035. This fleece is then needled whereby the loom operates at 200 perforation cycles per minute. The beam is set at 2 inches and the stroke is 2- /2 inches.
  • the fleece is removed from the carrier, turned over and needled again. After needling, the fleece is impregnated with a heat sensitized polyacrylate latex, which has a normal coagulation temperature of 80 C.
  • the fleece is impregnated wtih this coagulatable latex at room temperature.
  • the latex is dispersed in an aqueous medium. Its solids content is 48%.
  • the fleece is squeezed until it has a wet pick up to 400%.
  • After impregnation it is run between two carrier belts. There is a gap of 6 cm. between these two belts. Here, the fleece hangs down a little bit. Under this gap are arranged in line of 6 Bunsen burners. This flame of the Bunsen burner touches the Wet fleece.
  • the fleece passes over this heating zone with a speed of about 10 m./min. Thereby the impregnant is coagulated immediately upon the fleece being touched by the hot flame. Subsequently the fleece passes through a coventional dryer at a temperature of 120 C. in order to drive ofi the surplus water.
  • the fabric fibers may be continuous or staple and may be of substantially any composition conventionally used to make non-woven fabrics. These include nylon, cellulosics, wool, polyester, acrylics, etc.
  • the binders are conventionally heat coagulatable materials such as natural and synthetic rubber, polyacrylates,

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Nonwoven Fabrics (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
US758387A 1967-09-26 1968-09-09 Bonded non-woven fabric Expired - Lifetime US3591407A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEF0053591 1967-09-26

Publications (1)

Publication Number Publication Date
US3591407A true US3591407A (en) 1971-07-06

Family

ID=7106451

Family Applications (1)

Application Number Title Priority Date Filing Date
US758387A Expired - Lifetime US3591407A (en) 1967-09-26 1968-09-09 Bonded non-woven fabric

Country Status (7)

Country Link
US (1) US3591407A (de)
AT (1) AT277140B (de)
CH (2) CH504565A (de)
DE (1) DE1619054C2 (de)
FR (1) FR1582715A (de)
GB (1) GB1171267A (de)
NL (1) NL152311B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3932161A (en) * 1970-12-04 1976-01-13 Mcnish Thomas Gordon Fibrous insulating materials
US5290594A (en) * 1991-02-05 1994-03-01 Lainiere De Picardie Method for production of thermoadhesive fabric coverings, thermoadhesive fabric covering
US5571559A (en) * 1994-12-05 1996-11-05 Belding Heminway Co., Inc. Method and apparatus for bonding, coating and dyeing yarn

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3932161A (en) * 1970-12-04 1976-01-13 Mcnish Thomas Gordon Fibrous insulating materials
US5290594A (en) * 1991-02-05 1994-03-01 Lainiere De Picardie Method for production of thermoadhesive fabric coverings, thermoadhesive fabric covering
US5571559A (en) * 1994-12-05 1996-11-05 Belding Heminway Co., Inc. Method and apparatus for bonding, coating and dyeing yarn

Also Published As

Publication number Publication date
DE1619054B1 (de) 1970-06-18
NL6812338A (de) 1969-03-28
CH504565A (de) 1971-03-15
GB1171267A (en) 1969-11-19
FR1582715A (de) 1969-10-03
NL152311B (nl) 1977-02-15
AT277140B (de) 1969-12-10
CH1049568A4 (de) 1970-11-30
DE1619054C2 (de) 1975-04-03

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