EP0054610A1 - Process for simultaneously and continuously strengthening and coating a fleece fabric - Google Patents

Process for simultaneously and continuously strengthening and coating a fleece fabric Download PDF

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Publication number
EP0054610A1
EP0054610A1 EP81106160A EP81106160A EP0054610A1 EP 0054610 A1 EP0054610 A1 EP 0054610A1 EP 81106160 A EP81106160 A EP 81106160A EP 81106160 A EP81106160 A EP 81106160A EP 0054610 A1 EP0054610 A1 EP 0054610A1
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EP
European Patent Office
Prior art keywords
binder
printed
adhesive
nonwoven
printing
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EP81106160A
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German (de)
French (fr)
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EP0054610B1 (en
Inventor
Walter Dr. Föttinger
Sepp Dr. Wagner
Bohuslav Tecl
Werner Enders
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Carl Freudenberg KG
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Carl Freudenberg KG
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Priority to AT81106160T priority Critical patent/ATE8281T1/en
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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
    • D04H1/42—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
    • D04H1/58—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
    • D04H1/66—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 at spaced points or locations
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M17/00—Producing multi-layer textile fabrics

Definitions

  • the invention relates to a method for the simultaneous, continuous consolidation and coating of a nonwoven fabric with a binder and with an adhesive, in which the binder is counter-pressed from one side synchronously against the adhesive compound printed from the other side in the form of dedicated sub-areas, the Partial areas have a distance from each other.
  • Binders primarily serve to bond the fibers of a nonwoven fabric to one another and thereby give it strength. The strength is the greater the more fibers are glued together. It is therefore desirable that the binder penetrate into the interior of the treated nonwoven and, after it has solidified, be distributed as evenly as possible over the entire cross section.
  • crosslinkable polymeric substances are used as binders for practical use.
  • the adhesive compositions applied to the surface of fixing inserts serve to enable bonding with another substance.
  • Common adhesive compositions are thermoplastic substances, and the activation is effected by applying pressure and heat, for example with the aid of an iron.
  • the binder it is therefore desirable that the adhesive does not penetrate into the interior of the nonwoven used, even when ironing, but is available as completely and concentrated as possible for the mutual bonding of the superimposed surfaces.
  • the method mentioned at the beginning makes it possible to apply the binder and the adhesive composition congruently to the top and to the bottom of the nonwoven used. Due to the identical printing process used in the treatment of the top and bottom surfaces, however, the same press-in forces result, and it is therefore extremely difficult to obtain the desired one to realize different press-in of binder and adhesive. A mutual modification of the size of the applied areas is not possible and higher printing speeds can lead to an unclean print image and thus to undefined properties of the fixing insert obtained, especially when treating non-pre-consolidated nonwovens.
  • the invention has for its object to develop the method mentioned in such a way that a simultaneous, continuous printing of a binder and an adhesive on an unconsolidated nonwoven in the form of partial areas with a congruent center line on both sides a precise print image is achieved, which makes it possible to vary the specific order quantity on both sides as well as the mutual press-in at high working speeds and this enables a reduction in the specific energy consumption required.
  • a radiation-crosslinkable binder is printed from the underside against a thermoplastic adhesive compound which is printed on the hotmelt principle on the upper side of the nonwoven, and crosslinked by subsequent irradiation.
  • Both the binder paste and the adhesive melt contain no constituents that have to be removed by complex, subsequent drying processes, and the crosslinking of the binder can be brought about almost suddenly using high-energy rays.
  • the proposed method is not only extremely unproblematic to use due to the one-step procedure, but it also enables high working speeds of, for example, 50 to 150 m / min to be achieved with a reduced specific energy consumption. It is an advantage to be emphasized that a prior consolidation of the nonwovens used is not necessary. Rather, it is sufficient if these are compressed to such an extent by a previous pressing in the inner structure that the fiber structure is not destroyed during the printing process. This goal can be achieved without difficulty if a nonwoven fabric made of fibers with a stack length of at least 25 mm is used, the fibers of which are assigned to one another in a tangled distribution.
  • the printing paste or melt used is applied from both sides in partial areas, the center points of which are arranged on a common center line. In this respect they are assigned to each other symmetrically.
  • the size of the partial areas can be varied relative to one another, and can therefore be easily determined in such a way that the desired purpose in each case, namely the strengthening of the nonwoven in itself or thermosetting with a outer material, is achieved in an optimal manner.
  • Such an optimization would, however, mean that the processor would have to stock a special fixing insert depending on the absorbency and on other properties of each special material, which would quickly remove the obvious advantage. It has therefore proven useful to print the binder in partial areas, whose diameter is at least as large as that of the adhesive. Particularly good puncture resistance against the penetration of the adhesive during ironing through the fixing lines can be achieved if the partial surfaces made of binder have a larger diameter than the partial surfaces made of adhesive. The difference should not exceed 60% in order to prevent undesirable stiffening of the fixing insert.
  • the partial areas are distributed on the fixing insert in a surface grid that can be divided evenly or unevenly. In addition to the stiffness of the fixing insert, this can influence the textile case.
  • the printing methods used for the application of the adhesive and the binder basically belong to different types, which means that the two substances, which are intended to perform different types of tasks, can be applied in a favorable mutual coordination. It is also essential that at least one of the two opposing printing cylinders has soft-elastic properties by means of which differences in thickness or elasticity of the printed nonwoven fabric are compensated for during the printing process to such an extent that a disturbance in the printed image produced is avoided.
  • the binder can be applied using a high pressure, flat or gravure cylinder with a soft elastic jacket made of rubber. In all three cases, a good pressing into the interior of the nonwoven fabric is achieved. In addition, the high-pressure process combines the further advantage of a particularly good elasticity of the surface with good protection against soiling compared to fiber components detaching from the surface of the printed nonwoven fabric.
  • the specific amount of binder applied can be continuously changed by adjusting the printing device used. If a corresponding change is only necessary when using a gravure printing process, the use of a correspondingly modified printing roller is necessary. Modified printing rollers are also required if the size of the partial areas is to be modified in the high, flat or gravure printing process.
  • thermoplastic adhesive compound printed on the top The use of a binder that can be crosslinked by UV rays enables the binder to cure almost spontaneously due to the high energy density during crosslinking.
  • the inevitable excess energy, which can amount to 50% of the total energy used, can, however, diverge if the cooling is inadequate and thus lead to poor contour definition of the thermoplastic adhesive compound printed on the top.
  • All the relevant adhesive compositions can be processed, for example those based on polyolefin, copolyamides, polyurethanes or copolyesters.
  • the melting point is generally in the range between 100 and 130 ° C.
  • the adhesive used is printed in a melted form with the help of a heated bowl. To prevent contamination of the surface, it is specially equipped, for example with a silicone or a PTFE coating.
  • the upper and lower pressure rollers are connected by a gear transmission, which ensures that the mutual assignment of the printed partial areas of binder and adhesive is always assigned to one another in a constant form.
  • the rigid coupling enables a mutual assignment of extremely high precision, in which the centers of the partial areas printed on both sides can completely coincide with a working width of more than 1 m and a diameter of the partial areas of less than 1 mm.
  • a 25 g / m 2 heavy nonwoven fabric is made of 50% polyester fibers 1.7 dtex / 38 mm and 50% polyester fibers 3.3 dtex / 60 mm at a speed of 65 m / min.
  • the fleece is passed through a pair of rollers positioned at a line pressure of 13 kp / cm, the surface temperature of which is 165 ° C. and compacted therein.
  • the nonwoven web is passed through a printing device according to the attached drawing.
  • the lower pressure roller 2 is designed as a rubber high-pressure roller.
  • the rubber is resistant to organic liquids and has a Shore A hardness of 65.
  • the division of the high pressure pattern corresponds in the first case to a 17 mesh row point, at second case, a so-called computer point, in which 52 statistically distributed surveys per cm 2 are provided.
  • Each of these two rollers has a specially made hotmelt engraving roller with an identical pitch.
  • the diameter of the printing surface of the high-pressure roller is 0.8 mm, the engraving depth is 0.4 mm.
  • the binder mixture described below is applied via the rubber immersion roller 4 and the chrome-plated transfer roller 3, which is also heated to a temperature of 60 ° C and provided with a 60 nesh engraving Transfer rubber high-pressure roller 2.
  • the speed of the dipping roller 4 is set so that a print application from the high pressure roller to the fleece results in 2.5 g / m 2 .
  • the two pressure rollers 2 and 6 are set so that the medium and adhesive mass are absolutely congruent.
  • the binder mixture has the following composition:
  • a copolyester with a melting range of 113 to 116 ° C. and a melt index I2 / 140 ° C. of 18 g / 10 min is used as the hot-melt adhesive. It is melted in an extruder at a final temperature of 175 ° C and via a heated slot die in the hot-melt adhesive trough, which is also heated fed.
  • the engraving roller has a temperature of 170 ° C.
  • the wells diameter of the gravure roll in both cases is 0.55 mm, the Näpfc h entiefe 0.2 mm.
  • the wells of the rotating engraving roller fill in the hot-melt adhesive trough with melted polymer, which is transferred to the nonwoven web.
  • 2 binders with a temperature of 60 ° C are pressed into the interior of the nonwoven fabric from the underside via the high-pressure roller, whereby a spontaneous cooling and solidification of the adhesive 7 printed on the top is effected. 14 g of adhesive are applied per m 2 . No further treatment of the hot melt adhesive is required.
  • the fleece After leaving the printing unit, the fleece is transported with the help of a metal carrying belt through a light lock into an exposure box, where it is passed through two rows of high-pressure mercury lamps with an output of 200 watts / cm - one row each from above and from below .
  • the binder cures instantly.
  • the fleece leaves the exposure box through a second light lock and, after passing through a cooling roller, is cut into two webs, each with a finished width of 90 cm, and rolled up.
  • the heat-fixable interlining nonwoven fabric produced in this way is extremely soft and drapable, as well as very dry-cleaning-resistant and excellent wash-resistant. He's on the usual flat and Pieter h continuous presses properly to process, and even at high vapor exposure no inclination to remindverklebung, that is to penetrate the adhesive material by the reinforcement insert.

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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)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Laminated Bodies (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
  • Manufacturing Of Multi-Layer Textile Fabrics (AREA)
  • Nonwoven Fabrics (AREA)

Abstract

1. A process for continuously consolidating a non-woven and simultaneously coating it with a binder and with an adhesive composition, in which process the binder is synchronously counter-printed from one side against the adhesive composition, printed from the other side, in the form of matching part-surfaces, the part-surfaces being spaced apart from one another, characterised in that a binder crosslinkable by radiation is printed onto the nonwoven from underneath by means of a relief-printing, planographic printing or gravure-printing cylinder having a soft, resilient rubber covering, that a thermoplastic adhesive composition in molten form is printed onto the nonwoven from the top using a heated gravure roller and that the binder is crosslinked by subsequent irradiation.

Description

Die Erfindung betrifft ein Verfahren zum gleichzeitigen, kcntinuierlichen Verfestigen und Beschichten eines Vliesstoffes mit einem Bindemittel und mit einer Haftmasse, bei dem das Bindemittel von der einen Seite synchron gegen die von der anderen Seite aufgedruckte Haftmasse in Form sich damit dedcender Teilflächen gegengedruckt wird, wobei die Teilflächen untereinander jeweils einen Abstand haben.The invention relates to a method for the simultaneous, continuous consolidation and coating of a nonwoven fabric with a binder and with an adhesive, in which the binder is counter-pressed from one side synchronously against the adhesive compound printed from the other side in the form of dedicated sub-areas, the Partial areas have a distance from each other.

Ein solches Verfahren ist aus der japanischen Offenlegungsschrift 1667/1975 bekannt. Das Bindemittel und die Haftmassen werden dabei während des Hindurchleitens des Vliesstoffes durch ein Paar Gravur- oder Siebrollen aufgebracht. Die beiderseits erhaltenen Druckbilder sind demzufolge identisch, was nicht im Sinne der Zweckbestimmung der beiden Substanzen ist.Such a method is known from Japanese published patent application 1667/1975. The binder and the adhesive masses are applied during the passage of the nonwoven through a pair of engraving or screening rollers. The print images obtained on both sides are therefore identical, which is not in the sense of the intended use of the two substances.

Bindemittel dienen prinär dazu, die Fasern eines Vliesstoffes unter einander zu verkleben und ihm dadurch Festigkeit zu verleihen. Die Festigkeit ist un so größer, je mehr Fasern untereinander verklebt sind. Es ist deshalb erwünscht, daß das Bindemittel in das Innere des behandelten Vliesstoffes eindringt und nach dessen Verfestigung möglichst gleichmäßig über den gesamten Querschnitt -verteilt ist. Als Bindemittel kommen insbesondere vernetzbare polymere Substanzen zur praktischen Anwendung.Binders primarily serve to bond the fibers of a nonwoven fabric to one another and thereby give it strength. The strength is the greater the more fibers are glued together. It is therefore desirable that the binder penetrate into the interior of the treated nonwoven and, after it has solidified, be distributed as evenly as possible over the entire cross section. In particular, crosslinkable polymeric substances are used as binders for practical use.

Die auf die Oberfläche von Fixiereinlagen aufgebrachten Haftmassen dienen demgegenüber dazu, eine Verklebung mit einem anderen Stoff zu ermöglichen. Gebräuchliche Haftmassen sind thermoplastische Substanzen, und die Aktivierung wird durch Anwendung von Druck und Wärme, beispielsweise unter Zuhilfenahme eines Bügeleisens, bewirkt. Im Gegensatz zu dem Bindemittel ist es deshalb erwünscht, daß die Haftmasse auch während des Verbügelns möglichst nicht in das Innere des verwendeten Vliesstoffes eindringt, sondern möglichst vollständig und konzentriert für die gegenseitige Verklebung der aufeinanderliegenden Oberflächen zur Verfügung steht.In contrast, the adhesive compositions applied to the surface of fixing inserts serve to enable bonding with another substance. Common adhesive compositions are thermoplastic substances, and the activation is effected by applying pressure and heat, for example with the aid of an iron. In contrast to the binder, it is therefore desirable that the adhesive does not penetrate into the interior of the nonwoven used, even when ironing, but is available as completely and concentrated as possible for the mutual bonding of the superimposed surfaces.

Das eingangs angesprochene Verfahren ermöglicht es, das Bindemittel und die Haftmasse deckungsgleich auf die Ober- und auf die Unterseite des verwendeten Vliesstoffes aufzubringen. Bedingt durch das bei der Behandlung der Ober- und der Unterseite angewendete, identische Druckverfahren ergeben sich jedoch gleiche Einpreßkräfte, und es ist deshalb äußert schwierig, die erwünschte unterschiedliche Einpressung von Bindemittel und Haftmasse praktisch zu realisieren. Eine gegenseitige Modifizierung der Größe der aufgebrachten Teilflächen ist nicht möglich und größere Druckgeschwindigkeiten können insbesondere beim Behandeln nicht vorverfestigter Faservliese zu einem unsauberen Druckbild und damit zu undefinierten Eigenschaften der erhaltenen Fixiereinlage führen.The method mentioned at the beginning makes it possible to apply the binder and the adhesive composition congruently to the top and to the bottom of the nonwoven used. Due to the identical printing process used in the treatment of the top and bottom surfaces, however, the same press-in forces result, and it is therefore extremely difficult to obtain the desired one to realize different press-in of binder and adhesive. A mutual modification of the size of the applied areas is not possible and higher printing speeds can lead to an unclean print image and thus to undefined properties of the fixing insert obtained, especially when treating non-pre-consolidated nonwovens.

Aus der europäischen Patentanmeldung 12776 ist ein Verfahren bekannt, welches die Verfestigung eines Vliesstoffes durch Aufdrucken eines UV-härtbaren Bindemittels und anschließende Bestrahlung mit einer Quecksilber-Hochdrucklampe bei Arbeitsgeschwindigkeiten von mehr als 50 m/min ermöglicht. Das Aufbringen einer Haftmasse wird nicht angesprochen.From European patent application 12776 a method is known which enables the consolidation of a nonwoven fabric by printing on a UV-curable binder and subsequent irradiation with a high-pressure mercury lamp at working speeds of more than 50 m / min. The application of an adhesive is not addressed.

Der Erfindung liegt die Aufgabe zugrunde, das eingangs angesprochene Verfahren derart weiter zu entwickeln, daß beim gleichzeitigen, kontinuierlichen Aufdrucken eines Bindemittels und einer Haftmasse auf einen unverfestigten Vliesstoff in Form von Teilflächen mit deckungsgleicher Mittellinie beiderseits ein präzises Druckbild erzielt wird, das es ermöglicht, die beiderseitige spezifische Auftragsmenge sowie die beiderseitige Einpressung bei hohen Arbeitsgeschwindigkeiten zu variieren und das eine Verminderung des benötigten, spezifischen Energieeinsatzes ermöglicht.The invention has for its object to develop the method mentioned in such a way that a simultaneous, continuous printing of a binder and an adhesive on an unconsolidated nonwoven in the form of partial areas with a congruent center line on both sides a precise print image is achieved, which makes it possible to vary the specific order quantity on both sides as well as the mutual press-in at high working speeds and this enables a reduction in the specific energy consumption required.

Diese Aufgabe wird erfindungsgemäß mit den kennzeichnenden Merkmalen des Patentanspruches gelöst. Auf vorteilhafte Ausgestaltungen ist in den Unteransprüchen Bezug genommen.This object is achieved with the characterizing features of the patent claim. Advantageous configurations are referred to in the subclaims.

Bei dem erfindungsgemäßen Verfahren wird ein strahlungsvernetzbares Bindemittel von der Unterseite gegen eine nach dem Hotmelt-Prinzip auf die Cberseite des Vliesstoffes aufgedruckte, thermoplastische Haftmasse gedruckt und durch anschließende Bestrahlung vernetzt.In the method according to the invention, a radiation-crosslinkable binder is printed from the underside against a thermoplastic adhesive compound which is printed on the hotmelt principle on the upper side of the nonwoven, and crosslinked by subsequent irradiation.

Sowohl die Bindemittelpaste als auch die Haftmassenschmelze enthalten keinerlei Bestandteile, die durch aufwendige, nachträgliche Trocknungsvorgänge entfernt werden müssen, und die Vernetzung des Bindemittels läßt sich unter Anwendung energiereicher Strahlen nahezu schlagartig bewirken. Das vorgeschlagene Verfahren ist aufgrund der einstufigen Arbeitsweise nicht nur außerordentlich unproblematisch in der Anwendung, sondern es ermöglicht bei einem gesenkten spezifischen Energieverbrauch die Erzielung großer Arbeitsgeschwindigkeiten von beispielsweise 50 bis 150 m/min. Dabei ist es ein hervorzuhebender Vorteil, daß eine vorausgehende Verfestigung der eingesetzten Faservliese nicht erforderlich ist. Es genügt vielmehr, wenn diese durch eine vorausgehende Verpressung in der inneren Struktur soweit verdichtet sind, daß der Faserverband während des Druckvorganges nicht zerstört wird. Dieses Ziel läßt sich ohne Schwierigkeiten erreichen, wenn ein Vliesstoff aus Fasern mit einer Stapellänge von wenigstens 25 mm eingesetzt wird, dessen Fasern einander in einer wirren Verteilung zugeordnet sind.Both the binder paste and the adhesive melt contain no constituents that have to be removed by complex, subsequent drying processes, and the crosslinking of the binder can be brought about almost suddenly using high-energy rays. The proposed method is not only extremely unproblematic to use due to the one-step procedure, but it also enables high working speeds of, for example, 50 to 150 m / min to be achieved with a reduced specific energy consumption. It is an advantage to be emphasized that a prior consolidation of the nonwovens used is not necessary. Rather, it is sufficient if these are compressed to such an extent by a previous pressing in the inner structure that the fiber structure is not destroyed during the printing process. This goal can be achieved without difficulty if a nonwoven fabric made of fibers with a stack length of at least 25 mm is used, the fibers of which are assigned to one another in a tangled distribution.

Die verwendete Druckpaste oder Schmelze wird von beiden Seiten in Teilflächen aufgebracht, deren Mittelpunkte auf einer gemeinsamen Mittellinie angeordnet sind. Sie sind insofern einander symmetrisch zugeordnet.The printing paste or melt used is applied from both sides in partial areas, the center points of which are arranged on a common center line. In this respect they are assigned to each other symmetrically.

Die Größe der Teilflächen kann relativ zueinander variiert werden, und läßt sich demzufolge ohne weiteres so festlegen, daß der jeweils erwünschte Zweck, nämlich die Verfestigung des Vliesstoffes in sich bzw. Thermofixierung mit einem Cberstoff in optimaler Weise gelingt. Eine derartige Optimierung würde aber dazu führen, daß der Verarbeiter in Abhängigkeit von der Saugfähigkeit und von anderen Eigenschaften eines jeden speziellen Cberstoffes jeweils eine spezielle Fixiereinlage bevorraten müßte, was den offensichtlichen Vorteil schnell wieder beseitigen würde. Es hat sich deshalb bewährt, das Bindemittel in Teilflächen aufzudrucken, deren Durchmesser wenigstens so groß ist wie derjenige der Haftmasse. Eine besonders gute Durchschlagssicherheit gegen das Durchschlagen der Haftmasse während des Verbügelns durch die Fixiereinlige läßt sich erreichen, wenn die Teilflächen aus Bindemittel einen größeren Durchmesser haben als die Teilflächen aus Haftmasse. Der Unterschied soll 60 % nicht überschreiten, um zu verhindern, daß sich eine unerwünschte Versteifung der Fixiereinlage ergibt.The size of the partial areas can be varied relative to one another, and can therefore be easily determined in such a way that the desired purpose in each case, namely the strengthening of the nonwoven in itself or thermosetting with a outer material, is achieved in an optimal manner. Such an optimization would, however, mean that the processor would have to stock a special fixing insert depending on the absorbency and on other properties of each special material, which would quickly remove the obvious advantage. It has therefore proven useful to print the binder in partial areas, whose diameter is at least as large as that of the adhesive. Particularly good puncture resistance against the penetration of the adhesive during ironing through the fixing lines can be achieved if the partial surfaces made of binder have a larger diameter than the partial surfaces made of adhesive. The difference should not exceed 60% in order to prevent undesirable stiffening of the fixing insert.

Die Teilflächen sind auf der Fixiereinlage in einem Flächenraster verteilt, das gleichmäßig oder das ungleichmäßig geteilt sein kann. Neben der Steifkraft der Fixiereinlage läßt sich hierdurch der textile Fall beeinflussen.The partial areas are distributed on the fixing insert in a surface grid that can be divided evenly or unevenly. In addition to the stiffness of the fixing insert, this can influence the textile case.

Die für die Aufbringung der Haftmasse und des Bindemittels angewendeten Druckverfahren gehören grundsätzlich verschiedenen Gattungen an, wodurch erreicht wird, daß die beiden Substanzen, die bestimmungsmäßig verschiedenartige Aufgaben zu erfüllen haben, in einer günstigen gegenseitigen Abstinmung aufgebracht werden können. Es ist weiterhin von wesentlicher Bedeutung, daß von den beiden gegeneinanderlaufenden Druckzylindern zumindest einer weichelastische Eigenschaften aufweist, durch die Dicken- oder Elastizitätsunterschiede des bedruckten Vliesstoffes während des Druckvorganges soweit ausgeglichen werden, daß eine Störung des erzeugten Druckbildes vermieden wird.The printing methods used for the application of the adhesive and the binder basically belong to different types, which means that the two substances, which are intended to perform different types of tasks, can be applied in a favorable mutual coordination. It is also essential that at least one of the two opposing printing cylinders has soft-elastic properties by means of which differences in thickness or elasticity of the printed nonwoven fabric are compensated for during the printing process to such an extent that a disturbance in the printed image produced is avoided.

Das Bindemittel kann unter Anwendung eines Hoch-, Flach- oder Tiefdruckzylinders mit einem weichelastischen Mantel aus Gummi aufgebracht werden. In allen drei Fällen wird eine gute Einpressung in das Innere des Vliesstoffes erreicht. Das Hochdruckverfahren vereinigt in sich darüberhinaus den weiteren Vorteil einer besonders guten Elastizität der Oberfläche mit einer guten Verschmutzungssicherheit gegenüber sich von der Oberfläche des bedruckten Vliesstoffes ablösenden Faserbestandteilen.The binder can be applied using a high pressure, flat or gravure cylinder with a soft elastic jacket made of rubber. In all three cases, a good pressing into the interior of the nonwoven fabric is achieved. In addition, the high-pressure process combines the further advantage of a particularly good elasticity of the surface with good protection against soiling compared to fiber components detaching from the surface of the printed nonwoven fabric.

Beim Hoch- und Flachdruckverfahren kann die spezifisch aufgetrager Bindemittelmenge durch Verstellen der verwendeten Druckeinrichtung kontinuierlich verändert werden. Sofern eine entsprechende Änderur bei Anwendung eines Tiefdruckverfahrens erforderlich ist, ist der Einsatz einer entsprechend geänderten Druckwalze erforderlich. Geänderte Druckwalzen sind_weiterhin erforderlich, wenn die Größe der Teilflächen beim Hoch-, Flach- oder Tiefdruckverfahren modifiziert werden soll.In the case of high-pressure and planographic printing, the specific amount of binder applied can be continuously changed by adjusting the printing device used. If a corresponding change is only necessary when using a gravure printing process, the use of a correspondingly modified printing roller is necessary. Modified printing rollers are also required if the size of the partial areas is to be modified in the high, flat or gravure printing process.

Die Verwendung eines durch UV-Strahlen vernetzbaren Bindemittels ermöglicht durch eine große Energiedichte beim Vernetzen eine nahezu spontan ablaufende Aushärtung des Bindemittels. Die unvermeidbar aufzuwendende Überschußenergie, die 50 % der insgesamt .eingesetzten Energie betragen kann, kann bei unzureichender Kühlung aber zu einem Auseinanderlaufen und damit zu einer schlechten Konturenschärfe der auf die Oberseite aufgedruckten, thermoplastischen Haftmasse führen.The use of a binder that can be crosslinked by UV rays enables the binder to cure almost spontaneously due to the high energy density during crosslinking. The inevitable excess energy, which can amount to 50% of the total energy used, can, however, diverge if the cooling is inadequate and thus lead to poor contour definition of the thermoplastic adhesive compound printed on the top.

Dieser Nachteil läßt sich vermeiden, wenn ein Bindemittel eingesetzt wird, das durch Elektronenstrahlen vernetzbar ist. Eine weitere Erwärmung der Haftmasse findet in diesem Falle während der Vernetzung des Bindemittels nicht statt, sondern die spontane Abkühlung der thermoplastisch erschmolzenen Haftmasse gegen das mit einer Temperatur von z.B. nur 60° C aufgedruckte Bindemittel führt zu einer spontanen Erstarrung und damit zu einem Druckbild von größter Präzision.This disadvantage can be avoided if a binder is used which can be crosslinked by electron beams. A further heating of the adhesive does not take place in this case during the crosslinking of the binder, but the spontaneous cooling of the thermoplastic melted adhesive against that with a temperature of e.g. Binder printed at only 60 ° C leads to spontaneous solidification and thus to a print image of the highest precision.

Es lassen sich alle einschlägig verwendeten Haftmassen verarbeiten, beispielsweise solche auf Polyolefinbasis, Copolyamide, Polyurethane oder Copolyester. Der Schmelzpunkt liegt im allgemeinen im Bereich zwischen 100 und 130° C.All the relevant adhesive compositions can be processed, for example those based on polyolefin, copolyamides, polyurethanes or copolyesters. The melting point is generally in the range between 100 and 130 ° C.

Die eingesetzte Haftmasse wird in erschmolzener Form aufgedruckt unter Zuhilfenahme einer beheizten Näpfcherwalze. Um Verschmutzungen der Oberfläche zu verhindern, ist diese besonders ausgerüstet, beispielsweise durch eine Silicon- oder durch eine PTFE-Beschichtung.The adhesive used is printed in a melted form with the help of a heated bowl. To prevent contamination of the surface, it is specially equipped, for example with a silicone or a PTFE coating.

Die obere und die untere Druckwalze sind durch eine Zahnradübersetzung verbunden, wodurch erreicht wird, daß die gegenseitige Zuordnung der aufgedruckten Teilflächen aus Bindemittel und Haftmasse einander stets in gleichbleibender Form zugeordnet sind. Die starre Kopplung ermöglicht eine gegenseitige Zuordnung von außerordentlich großer Präzision, bei der sich die Mittelpunkte der beiderseits aufgedruckten Teilflächen bei einer Arbeitsbreite von mehr als 1 m und einem Durchmesser der Teilflächen von weniger als 1 mm vollständig decken können.The upper and lower pressure rollers are connected by a gear transmission, which ensures that the mutual assignment of the printed partial areas of binder and adhesive is always assigned to one another in a constant form. The rigid coupling enables a mutual assignment of extremely high precision, in which the centers of the partial areas printed on both sides can completely coincide with a working width of more than 1 m and a diameter of the partial areas of less than 1 mm.

Das erfindungsgemäße Verfahren wird durch die in der Anlage beigefügte Zeichnung und das nachfolgende Beispiel näher erläutert:The process according to the invention is explained in more detail by the attached drawing and the following example:

Mit Hilfe mehrerer in Längsrichtung stehender Krenpelanlagen wird ein 25 g/m2 schweres Faservlies aus 50 % Polyesterfasern 1,7 dtex/38 mm und 50 % Polyesterfasern 3,3 dtex/60 mm mit einer Geschwindigkeit von 65 m/min hergestellt. Das Vlies wird durch ein Paar mit einem Liniendruck von 13 kp/cm gegeneinander angestellter Walzen geleitet, deren Oberflächentemperatur 165° C beträgt und darin verdichtet.With the help of several longitudinal Krenpel lines, a 25 g / m 2 heavy nonwoven fabric is made of 50% polyester fibers 1.7 dtex / 38 mm and 50% polyester fibers 3.3 dtex / 60 mm at a speed of 65 m / min. The fleece is passed through a pair of rollers positioned at a line pressure of 13 kp / cm, the surface temperature of which is 165 ° C. and compacted therein.

Unmittelbar anschließend wird die Vliesbahn durch eine Druckvorrichtung nach der beigefügten Zeichnung geführt.Immediately afterwards, the nonwoven web is passed through a printing device according to the attached drawing.

Die untere Druckwalze 2 ist als Gummi-Hochdruckwalze ausgebildet, Der Gummi ist beständig gegen organische Flüssigkeiten und weist eine Shore-A-Härte von 65 auf. Die Teilung des Hochdruckmusters entspricht im ersten Falle einem 17 mesch-Reihenpunkt, beim zweiten Falle einem sogenannten Computerpunkt, bei dem 52 statistisch verteilte Erhebungen pro cm2 vorgesehen sind. Zu jeder dieser beiden Walzen gehört eine speziell angefertigte Hotmelt-Gravurwalze mit identischer Teilung.The lower pressure roller 2 is designed as a rubber high-pressure roller. The rubber is resistant to organic liquids and has a Shore A hardness of 65. The division of the high pressure pattern corresponds in the first case to a 17 mesh row point, at second case, a so-called computer point, in which 52 statistically distributed surveys per cm 2 are provided. Each of these two rollers has a specially made hotmelt engraving roller with an identical pitch.

Der Durchmesser der Druckflächen der Hochdruckwalze beträgt 0,8 mm, die Gravurtiefe 0,4 mm.The diameter of the printing surface of the high-pressure roller is 0.8 mm, the engraving depth is 0.4 mm.

Von der auf eine Temperatur von 60° C vorgeheizten Wanne mit Präpolymer 5 wird die unten beschriebene Bindemittelmischung über die Tauchwalze 4 aus Gummi und die ebenfalls auf eine Temperatur von 60° C erwärmte, mit einer 60 nesh-Gravierung versehene, verchromte Übertragwalze 3 auf die Gummi-Hochdruckwalze 2 übertragen. Die Geschwindigkeit der Tauchwalze 4 ist so eingestellt, daß ein Druckauftrag von der Hochdruckwalze auf das Vlies 2,5 g/m2 resultiert.From the tub preheated to a temperature of 60 ° C with prepolymer 5, the binder mixture described below is applied via the rubber immersion roller 4 and the chrome-plated transfer roller 3, which is also heated to a temperature of 60 ° C and provided with a 60 nesh engraving Transfer rubber high-pressure roller 2. The speed of the dipping roller 4 is set so that a print application from the high pressure roller to the fleece results in 2.5 g / m 2 .

Die beiden Druckwalzen 2 und 6 sind so eingestellt, daß die mittel und Haftmasse absolut deckungsgleich übereinanderliegen. Die Bindemittelmischung hat die folgende Zusammensetzung:

Figure imgb0001
The two pressure rollers 2 and 6 are set so that the medium and adhesive mass are absolutely congruent. The binder mixture has the following composition:
Figure imgb0001

Als Schmelzkleber wird ein Copolyester verwendet, dessen Schmelzbereich 113 bis 116° C beträgt und der einen Schmelzindex I2/140° C von 18 g/10 min aufweist. Er wird in einem Extruder bei einer Endtenperatur von 175° C aufgeschmolzen und über eine beheizte Breitschlitzdüse der ebenfalls beheizten Schmelzkleberwanne zugeführt. Die Gravurwalze weist eine Temperatur von 170° C auf.A copolyester with a melting range of 113 to 116 ° C. and a melt index I2 / 140 ° C. of 18 g / 10 min is used as the hot-melt adhesive. It is melted in an extruder at a final temperature of 175 ° C and via a heated slot die in the hot-melt adhesive trough, which is also heated fed. The engraving roller has a temperature of 170 ° C.

Der Näpfchen-Durchmesser der Gravurwalze beträgt in beiden Fällen 0,55 mm, die Näpfchentiefe 0,2 mm.The wells diameter of the gravure roll in both cases is 0.55 mm, the Näpfc h entiefe 0.2 mm.

Die Näpfchen der rotierenden Gravurwalze füllen sich in der Schmelzkleberwanne mit geschmolzenem Polyrer, welches auf die Vliesbahn übertragen wird.- Synchron zu diesem Vorgang wird von der Unterseite über die Hochdruckwalze 2 Bindemittel mit einer Temperatur von 60° C in das Innere des Vliesstoffes eingepresst, wodurch eine spontane Abkühlung und Erstarrung der auf die Oberseite aufgedruckten Haftmasse 7 bewirkt wird. Es werden pro m2 14 g Haftmasse auf getragen. Eine weitere Behandlung des Schmelzklebers ist nicht erforderlich.The wells of the rotating engraving roller fill in the hot-melt adhesive trough with melted polymer, which is transferred to the nonwoven web. - In synchrony with this process, 2 binders with a temperature of 60 ° C are pressed into the interior of the nonwoven fabric from the underside via the high-pressure roller, whereby a spontaneous cooling and solidification of the adhesive 7 printed on the top is effected. 14 g of adhesive are applied per m 2 . No further treatment of the hot melt adhesive is required.

Nach Verlassen des Druckwerkes wird das Vlies mit Hilfe eines Tragebandes aus Metall durch eine Lichtschleuse in einen Belichtungskasten transportiert, wo es durch zwei Reihen von Quecksilber-Hochdrucklampen mit einer Leistung von 200 Watt/cm - je eine Reihe von oben und von unten - geleitet wird. Die Härtung des Bindemittels erfolgt augenblicklich. Das Vlies verläßt durch eine zweite Lichtschleuse den Belichtungskasten und wird nach Passieren einer Kühlwalze in zwei Bahnen von je 90 cm Fertigbreite geschnitten und aufgerollt.After leaving the printing unit, the fleece is transported with the help of a metal carrying belt through a light lock into an exposure box, where it is passed through two rows of high-pressure mercury lamps with an output of 200 watts / cm - one row each from above and from below . The binder cures instantly. The fleece leaves the exposure box through a second light lock and, after passing through a cooling roller, is cut into two webs, each with a finished width of 90 cm, and rolled up.

Der so hergestellte, thermofixierbare Einlagevliesstoff ist extrem weich und drapierfähig sowie sehr gut chemisch-reinigungsbeständig und ausgezeichnet waschbeständig. Er ist auf den üblichen Flach-und Durchlaufpressen einwandfrei zu verarbeiten und zeigt selbst bei starker Dampfeinwirkung keinerlei Neigung zur Rückverklebung, d.h. zum Durchschlagen der Haftmasse durch die Verstärkungseinlage.The heat-fixable interlining nonwoven fabric produced in this way is extremely soft and drapable, as well as very dry-cleaning-resistant and excellent wash-resistant. He's on the usual flat and Pieter h continuous presses properly to process, and even at high vapor exposure no inclination to Rückverklebung, that is to penetrate the adhesive material by the reinforcement insert.

Claims (6)

1. Verfahren zum gleichzeitigen, kontinuierlichen Verfestigen und Beschichten eines Vliesstoffes mit einem Bindemittel und mit einer Haftmasse, bei dem das Bindemittel von der einen Seite synchron gegen die von der anderen Seite aufgedruckte Haftmasse in Form sich damit deckender Teilflächen gegengedruckt wird, wobei die Teilflächen untereinander jeweils einen Abstand haben, dadurch gekennzeichnet, daß ein strahlungsvernetzbares Bindemittel von der Unterseite gegen eine nach dem Hotmelt-Prinzip auf die Oberseite des Vliesstoffes aufgedruckte, thermoplastische Haftmasse gedruckt wird, und daß das Bindemittel durch anschließende Bestrahlung vernetzt wird.1. A method for the simultaneous, continuous solidification and coating of a nonwoven fabric with a binder and with an adhesive, in which the binder is counter-pressed synchronously from one side against the adhesive compound printed from the other side in the form of partial areas that overlap therewith, the partial areas one below the other each have a spacing, characterized in that a radiation-crosslinkable binder is printed from the underside against a thermoplastic adhesive composition printed on the hotmelt principle on the top of the nonwoven, and in that the binder is crosslinked by subsequent irradiation. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß ein UV-härtbares Bindemittel aufgedruckt wird, und daß zur Ver- ; netzung eine Quecksilber-Gasentladungslanpe mit einer Leistung von mindestens 80 Watt/cm verwendet wird.2. The method according to claim 1, characterized in that a UV-curable binder is printed, and that for ver; a mercury gas discharge lamp with an output of at least 80 watts / cm is used. 3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß ein durch Elektronenstrahlen vernetzbares Bindemittel aufgedruckt wird, und daß zur Vernetzung eine Strahlenquelle mit einer Leistung von 50 bis 500 keV verwendet wird.3. The method according to claim 1, characterized in that a crosslinkable by electron beams binder is printed, and that a radiation source with a power of 50 to 500 keV is used for crosslinking. 4. Verfahren nach Anspruch 1 bis 3, dadurch gekennzeichnet, daß das Bindemittel in Flächenbereichen aufgedruckt wird, die die von der Haftmasse bedeckten Flächen überdecken.4. The method according to claim 1 to 3, characterized in that the binder is printed in surface areas which cover the surfaces covered by the adhesive. 5. Verfahren nach Anspruch 1 bis 4, dadurch gekennzeichnet, daß.die Flächenbereiche in einem regelmäßigen Flächenraster aufgedruckt werden.5. The method according to claim 1 to 4, characterized in that the surface areas are printed in a regular surface pattern. 6. Verfahren nach Anspruch 1 bis 4, dadurch gekennzeichnet, daß die Flächenbereiche in einem statistischen Flächenraster aufgedruckt werden.6. The method according to claim 1 to 4, characterized in that the surface areas are printed in a statistical area grid.
EP81106160A 1980-12-24 1981-08-06 Process for simultaneously and continuously strengthening and coating a fleece fabric Expired EP0054610B1 (en)

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AT81106160T ATE8281T1 (en) 1980-12-24 1981-08-06 PROCESS FOR SIMULTANEOUS, CONTINUOUS BONDING AND COATING OF A NONWOVEN.

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DE3049037 1980-12-24
DE3049037A DE3049037C2 (en) 1980-12-24 1980-12-24 Process for the simultaneous, continuous consolidation and coating of a nonwoven fabric

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GB2384250A (en) * 2001-11-19 2003-07-23 Truetzschler Gmbh & Co Kg Apparatus for consolidating a conveyable fibre web
GB2557836B (en) * 2015-11-02 2022-12-28 Trimaco Inc Slip-resistant protective mat

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JPS5891859A (en) * 1981-11-20 1983-05-31 日本バイリ−ン株式会社 Production of nonwoven fabric
CN1157643A (en) * 1994-08-09 1997-08-20 旭化成工业株式会社 Adhesive padding cloth, method of manufacturing same and bonding agent for adhesive cloths
US6638605B1 (en) * 1999-11-16 2003-10-28 Allegiance Corporation Intermittently bonded nonwoven disposable surgical laminates
US20040043212A1 (en) 2000-08-05 2004-03-04 Peter Grynaeus Thermal control nonwoven material
DE102005030484B4 (en) * 2005-06-28 2007-11-15 Carl Freudenberg Kg Elastic nonwoven fabric, process for its preparation and its use

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Publication number Priority date Publication date Assignee Title
GB2384250A (en) * 2001-11-19 2003-07-23 Truetzschler Gmbh & Co Kg Apparatus for consolidating a conveyable fibre web
GB2384250B (en) * 2001-11-19 2005-10-05 Truetzschler Gmbh & Co Kg Apparatus for consolidating a conveyable fibre web
GB2557836B (en) * 2015-11-02 2022-12-28 Trimaco Inc Slip-resistant protective mat

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DE3164567D1 (en) 1984-08-09
JPS57128248A (en) 1982-08-09
ES508331A0 (en) 1982-12-01
ATE8281T1 (en) 1984-07-15
AR229251A1 (en) 1983-07-15
DE3049037A1 (en) 1982-07-22
JPS6317148B2 (en) 1988-04-12
ZA818889B (en) 1983-03-30
DE3049037C2 (en) 1984-05-03
ES8301297A1 (en) 1982-12-01
EP0054610B1 (en) 1984-07-04

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