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EP0281663A2 - Two-layered thermofusible non-woven fabric - Google Patents

Two-layered thermofusible non-woven fabric Download PDF

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Publication number
EP0281663A2
EP0281663A2 EP87108537A EP87108537A EP0281663A2 EP 0281663 A2 EP0281663 A2 EP 0281663A2 EP 87108537 A EP87108537 A EP 87108537A EP 87108537 A EP87108537 A EP 87108537A EP 0281663 A2 EP0281663 A2 EP 0281663A2
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EP
European Patent Office
Prior art keywords
layer
nonwoven
fibers
heat
sealable
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.)
Ceased
Application number
EP87108537A
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German (de)
French (fr)
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EP0281663A3 (en
Inventor
Peter Dr. Grynaeus
Gerhard Dr. Schaut
Chet Petkiewicz
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Carl Freudenberg KG
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Carl Freudenberg KG
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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
    • D04H5/00—Non woven fabrics formed of mixtures of relatively short fibres and yarns or like filamentary material of substantial length
    • D04H5/02—Non woven fabrics formed of mixtures of relatively short fibres and yarns or like filamentary material of substantial length strengthened or consolidated by mechanical methods, e.g. needling
    • 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
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24058—Structurally defined web or sheet [e.g., overall dimension, etc.] including grain, strips, or filamentary elements in respective layers or components in angular relation
    • Y10T428/24124—Fibers
    • 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
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
    • 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
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
    • Y10T428/2813—Heat or solvent activated or sealable
    • Y10T428/2817—Heat sealable
    • Y10T428/2826—Synthetic resin or polymer
    • 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.]
    • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/69—Autogenously bonded nonwoven fabric
    • 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.]
    • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/69—Autogenously bonded nonwoven fabric
    • Y10T442/692—Containing at least two chemically different strand or fiber materials

Definitions

  • the present invention relates to a two-layer, heat-sealable nonwoven having the features of the preamble of claim 1.
  • US-A 4,490,427 describes an inherently stable heat-sealing tape, built up from a parallel group of thermoplastic softenable threads, which are thematically connected to one another via tangled thermoplastic fibers.
  • Polymer fibers made from materials which have a melting point below 150 ° C., such as co-, ter- or higher polymers of polyamides or polyesters, for example a terpolymer made of nylon 6, nylon 66 and nylon 12, are preferably used.
  • the tensile strength of this product is not achievable sufficient in all applications, as the following comparison of staple fibers (source: E. Wagner, Die textile Rohstoffe, DFV Frankfurt (Main), (1981)) with the above-mentioned thermoplastic fibers (own measurements) shows: The low values of the latter fibers are due to the low crystallinity or low orientation towards stretching.
  • US Pat. No. 4,440,819 specifies a fiber arrangement in which unidirectionally directed, high-tensile high-modulus fibers, preferably mineral fibers, are melt-bonded to one another by means of polymeric tangled fibers.
  • this layer can be impregnated with resin and laminated to form a multi-layer laminate. It has been shown, however, that such laminates lack the required longitudinal elongation capacity, particularly in the case of grammages above 40 g / m 2.
  • GB-B 1,117,751 describes the production of a heat-sealable stiffening material, thermoplastic fibers preferably being extruded onto a continuously moving nonwoven carrier and being fused to one another and to the carrier.
  • the carrier consists of silicone paper that can be removed from the fiber mat.
  • This problem is solved, starting from the prior art shown in GB-B 1,117,751, in a nonwoven fabric with the characterizing features of claim 1.
  • the subclaims indicate preferred embodiments.
  • the first layer of the nonwoven fabric according to the invention can consist of randomly arranged thermoplastic polymer filaments or of parallel thermoplastic polymer filaments, the latter being melt-bonded to one another by randomly deposited thermoplastic filaments, as indicated in the aforementioned US Pat. No. 4,490,427.
  • the fibers of the second, heat-sealable layer can be solidified with one another as desired. B. by application of heat and / or pressure, by polymeric binder dispersions or by combinations of the types of consolidation mentioned.
  • suitable fiber materials are the known in the case of single-layer, iron-on nonwovens (US Pat. No. 4,490,427) co-, ter- or higher polyesters, such polyamides or polyvinyl chloride, such as, for. B. a terpolymer of nylon 6, nylon 66 and nylon 12.
  • the melting point of these fibers according to the invention must be in the range of 75 to 140 ° C and lower than that of the non-binding fibers.
  • thermoplastic, bindable fibers and filaments in the entire nonwoven composite must be between 40 and 98% by weight.
  • the weight per unit area of the second heat-sealable nonwoven layer preferably makes up 5 to 60% of that of the overall composite.
  • the heat-sealable second nonwoven layer has irregularly distributed openings of 0.5 to 5 mm in width and 1 to 50 mm in length with a width / length ratio of 1:20 to 1: 100.
  • the spacing of the openings from one another can be varied over a wide range down to fiber thickness dimensions, as can the size of the openings.
  • This advantageous embodiment allows heat and pressure to act on the nonwoven fabric so that it can penetrate on all sides with the heat-sealable components; the composite thus behaves like a single-layer, heat-sealable nonwoven.
  • the manufacturing process for the nonwoven fabric according to the invention is advantageously carried out analogously to the extrusion or meltblowing process described at the beginning, described in GB-B 1,117,751, the first nonwoven fabric layer forming the continuously moving textile backing on which the second heat-sealable fiber layer is permanently fixed.
  • the heat-sealable composite according to the invention has a surprisingly improved tensile strength, good adhesion to outer materials, such as. As cotton / polyester, polyester, nylon or cotton, and easier to manufacture, without the need for an intermediate support layer. These improved properties extend the field of application of such a nonwoven composite to those cases where high tensile strengths are absolutely necessary and where the previous heat-sealable nonwovens had to fail.
  • the figure attached is the photographic top view of the second layer of the nonwoven according to the invention, the scale is 1: 0.97.
  • a 12 g / m2 nonwoven was made by carding a mixture of 30% by weight thermally adhesive copolyester fibers (3.5 den at 38 mm stack length, melting point at 130 ° C.) and 70% by weight polyethylene terephthalate staple fibers (3.0 manufactured at 50 mm stack length). The fibers were bonded using a commercially available polymer binder dispersion based on polyester. It was then dried with a set of multiple steam-heated drying cylinders at a closing pressure of 1.41 to 2.11 kp / cm2 (20 to 30 psi).
  • the dry weight of the added binder was 4 g / m2 with a total weight of 16 g / m2.
  • the fiber: binder ratio in the nonwoven fabric was 75:25, its density was 0.039 g / cm3.
  • the nonwoven fabric from Example 1A was provided with a heat-sealable fiber sheet made of copolyester filaments and had a weight of 50 g / m2.
  • the copolyester filaments had a softening range of 130 to 135 ° C.
  • a composite was created by the combined application of heat and pressure using calender rolls. The temperature was 85 ° C, the closing pressure was 1.41 kp / cm2 (20 psi).
  • a 17 g / m2 nonwoven fabric was produced as in Example 1A and, in addition to the polyethylene terephthalate fibers, contained 30% by weight of thermally adhesive copolymer fibers (melting range around 130 ° C.).
  • the total weight of the binder-bound nonwoven was 22 g / m2.
  • a 14 g / m2 nonwoven fabric was made as in Example 1A but with a fiber blend ratio of 1: 1. After finishing with binder, the total weight of the nonwoven fabric (dry) was 18 g / m2.
  • Example 3A The nonwoven fabric from Example 3A was laminated with the heat-sealable fibrous sheet material analogously to Example 1B, but its weight was 80 g / m2, its melting range was 110 to 115 ° C. and the calendering temperature was 70 ° C.
  • the nonwoven fabric from Example 4 A was laminated with a heat-sealable fiber sheet. This had a weight of 50 g / m2 and contained a terpolyamide made of nylon 6, 66 and 12 with a melting range of 110 to 120 ° C.
  • Lamination to a composite was carried out using a calender roll heated to 70 ° C. at a closing pressure of 1.41 kp / cm2 (20 psi).

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Laminated Bodies (AREA)
  • Nonwoven Fabrics (AREA)

Abstract

A two-layered, heat-sealable nonwoven fabric consists of a first nonwoven layer comprising thermoplastic filaments to which a second nonwoven layer containing proportions of low melting copolymer fibres has been bonded.

Description

Die vorliegende Erfindung befaßt sich mit einem zweischich­tigen, heißsiegelfähigen Vliesstoff mit den Merkmalen des Oberbegriffes des Anspruchs 1.The present invention relates to a two-layer, heat-sealable nonwoven having the features of the preamble of claim 1.

US-A 4,490,427 beschreibt ein eigenstabiles Heißsiegelband, aufgebaut aus einer Parallelenschar thermoplastisch erweich­barer Fäden, welche untereinander über wirr abgelegte ther­moplastische Fasern themisch verbunden sin. Vorzugsweise werden Polymerfasern aus Materialien eingesetzt, welche einen Schmelzpunkt unter 150°C besitzen, wie Co-, Ter- oder höhere Polymere von Polyamiden oder Polyestern, z.B. ein Terpolymer aus Nylon 6, Nylon 66 und Nylon 12. Die erreichbare Zugfe­stigkeit dieses Produktes ist nicht in allen Anwendungsfäl­len ausreichend, wie der folgende Vergleich von Stapelfasern (Quelle: E. Wagner, Die textilen Rohstoffe, DFV Frankfurt (Main), (1981)) mit den obengenannten thermoplastischen Fa­sern (eigene Messungen) zeigt:

Figure imgb0001
Die niedrigen Werte der letzteren Fasern sind bedingt durch die niedere Kristallinität bzw. geringe Verstrek­kungsorientierung.US-A 4,490,427 describes an inherently stable heat-sealing tape, built up from a parallel group of thermoplastic softenable threads, which are thematically connected to one another via tangled thermoplastic fibers. Polymer fibers made from materials which have a melting point below 150 ° C., such as co-, ter- or higher polymers of polyamides or polyesters, for example a terpolymer made of nylon 6, nylon 66 and nylon 12, are preferably used. The tensile strength of this product is not achievable sufficient in all applications, as the following comparison of staple fibers (source: E. Wagner, Die textile Rohstoffe, DFV Frankfurt (Main), (1981)) with the above-mentioned thermoplastic fibers (own measurements) shows:
Figure imgb0001
 The low values of the latter fibers are due to the low crystallinity or low orientation towards stretching.

In US-A 4,440,819 wird eine Faseranordnung angegeben, bei der unidirektional gerichtete, zugfeste Hochmodulfasern, vorzugsweise Mineralfasern, mittels polymerer Wirrfasern miteinander schmelzverbunden sind. Diese Schicht kann in einer bevorzugten Ausgestaltung mit Harz imprägniert und zu einem mehrlagigen Schichtstoff laminiert sein. Es hat sich jedoch gezeigt, daß, insbesondere bei Flächengewich­ten über 40 g/m², solchen Laminaten das erforderliche Längs­dehnungsvermögen fehlt.US Pat. No. 4,440,819 specifies a fiber arrangement in which unidirectionally directed, high-tensile high-modulus fibers, preferably mineral fibers, are melt-bonded to one another by means of polymeric tangled fibers. In a preferred embodiment, this layer can be impregnated with resin and laminated to form a multi-layer laminate. It has been shown, however, that such laminates lack the required longitudinal elongation capacity, particularly in the case of grammages above 40 g / m 2.

GB-B 1,117,751 beschreibt die Herstellung eines heißsiegel­fähigen Versteifungsmaterials, wobei thermoplastische Fa­sern vorzugsweise auf einen sich kontinuierlich bewegenden Vliesstoffträger extrudiert und dabei miteinander sowie mit dem Träger verschmolzen werden. Alternativ besteht der Trä­ger aus von der Fasermatte abziehbarem Silikonpapier.GB-B 1,117,751 describes the production of a heat-sealable stiffening material, thermoplastic fibers preferably being extruded onto a continuously moving nonwoven carrier and being fused to one another and to the carrier. Alternatively, the carrier consists of silicone paper that can be removed from the fiber mat.

Auch das Schmelzblasen von Fasern, wie es in DE-PS 23 34 741 (= US-A 3,825,380) beschrieben ist, ist dabei zur Herstel­lung geeignet.The meltblowing of fibers, as described in DE-PS 23 34 741 (= US-A 3,825,380), is also suitable for the production.

Typische Flächengewichte aller vorbeschriebenen, bekannten, dünnen Vliesmaterialien, vorzugsweise als 10 bis 13 mm brei­te Bänder konfektioniert, sind 20 bis 80 g/m². Ihnen mangelt es an der erforderlichen Zugfestigkeit. Schwerere und somit festere Ausführungen, z.B. die soeben genannten Laminate, sind möglich; sie besitzen jedoch eine ungünstig erhöhte Sprödigkeit. Alle diese Eigenschaften bekannter Bänder wir­ken sich insbesondere beim Einsatz in Hochgeschwindigkeits-­Verarbeitungsmaschinen negativ aus.Typical basis weights of all the known thin nonwoven materials described above, preferably made up as tapes 10 to 13 mm wide, are 20 to 80 g / m 2. They lack the required tensile strength. Heavier and therefore firmer versions, e.g. the laminates just mentioned are possible; however, they have an unfavorably increased brittleness. All of these properties of known belts have a negative effect particularly when used in high-speed processing machines.

Es liegt der vorliegenden Erfindung die Aufgabe zugrunde, einen heißsiegelfähigen zweilagigen, auch mit Hochgeschwin­digkeitsvorrichtungen beschädigungslos zu verarbeitenden Vliessstoff anzugeben, der, insbesondere auch in Form eines Bandes, über einen Gewichtsbereich von 10 bis 180 g/m² we­der zu niedrige Zugfestigkeit noch zu hohe Sprödigkeit zeigt. Die Lösung dieser Aufgabe besteht, ausgehend von dem in GB-B 1,117,751 aufgezeigten Stand der Technik, in einem Vliesstoff mit den kennzeichnenden Merkmalen des Anspruchs 1. Die Unteransprüche weisen auf bevorzugte Ausführungs­formen hin.It is the object of the present invention to provide a heat-sealable two-layer nonwoven fabric which can be processed without damage even with high-speed devices and which, in particular also in the form of a tape, shows neither too low a tensile strength nor too high brittleness over a weight range of 10 to 180 g / m 2 . This problem is solved, starting from the prior art shown in GB-B 1,117,751, in a nonwoven fabric with the characterizing features of claim 1. The subclaims indicate preferred embodiments.

Die erste Schicht des erfindungsgemäßen Vliesstoffes kann aus wirr angeordneten thermoplastischen Polymerfilamenten oder aus parallelen thermoplastischen Polymer-Filamenten bestehen, welche letztere miteinander durch wirr abgelegte thermoplastische Filamente schmelzverbunden sind, wie dies in der erwähnten US-A 4,490,427 angegeben ist.The first layer of the nonwoven fabric according to the invention can consist of randomly arranged thermoplastic polymer filaments or of parallel thermoplastic polymer filaments, the latter being melt-bonded to one another by randomly deposited thermoplastic filaments, as indicated in the aforementioned US Pat. No. 4,490,427.

Die Fasern der zweiten, heißsiegelfähigen Schicht können beliebig miteinander verfestigt sein, so z. B. durch Hitze-­und/oder Druckanwendung, durch polymere Bindemitteldisper­sionen oder durch Kombinationen der genannten Verfestigungs­arten. Für die Heißsiegelfähigkeit der zweiten Schicht ge­eignete Fasermaterialien sind dabei die bei einschichtigen, aufbügelbaren Vliesstoffen bekannten (US-A 4,490,427) Co-, Ter- oder höheren Polyester, ebensolche Polyamide oder Po­lyvinylchlorid, so z. B. ein Terpolymer aus Nylon 6, Nylon 66 und Nylon 12. In jedem Falle muß erfindungsgemäß der Schmelzpunkt dieser Fasern im Bereich von 75 bis 140°C lie­gen und niedriger als der jenige der nicht bindenden Fasern sein.The fibers of the second, heat-sealable layer can be solidified with one another as desired. B. by application of heat and / or pressure, by polymeric binder dispersions or by combinations of the types of consolidation mentioned. For the heat sealability of the second layer, suitable fiber materials are the known in the case of single-layer, iron-on nonwovens (US Pat. No. 4,490,427) co-, ter- or higher polyesters, such polyamides or polyvinyl chloride, such as, for. B. a terpolymer of nylon 6, nylon 66 and nylon 12. In any case, the melting point of these fibers according to the invention must be in the range of 75 to 140 ° C and lower than that of the non-binding fibers.

Die Summe aller thermoplastischen, bindefähigen Fasern und Filamente im gesamten Vliesstoffverbund muß zwischen 40 und 98 Gew.-% betragen.The total of all thermoplastic, bindable fibers and filaments in the entire nonwoven composite must be between 40 and 98% by weight.

Vorzugsweise macht das Flächengewicht der zweiten, heißsie­gelfähigen Vliesstoffschicht 5 bis 60% desjenigen des Ge­samtverbundes aus.The weight per unit area of the second heat-sealable nonwoven layer preferably makes up 5 to 60% of that of the overall composite.

In einer weiteren, bevorzugten Ausgestaltung weist die heißsiegelfähige zweite Vliesstoffschicht unregelmäßig verteilte Öffnungen von 0,5 bis 5 mm Breite und 1 bis 50 mm Länge bei einem Breite/Länge-Verhältnis von 1:20 bis 1:100 auf.In a further preferred embodiment, the heat-sealable second nonwoven layer has irregularly distributed openings of 0.5 to 5 mm in width and 1 to 50 mm in length with a width / length ratio of 1:20 to 1: 100.

Der Abstand der Öffnungen zueinander kann über einen wei­ten Bereich bis hinab zu Faserdicken-Dimensionen variiert werden, ebenso die Größe der Öffnungen. Diese vorteilhafte Ausgestaltung erlaubt bei Einwirkung von Hitze und Druck auf den Vliesstoff dessen allseitige Durchdringung mit den heißsiegelfähigen Komponenten; der Verbund verhält sich damit wie ein einschichtiger heißsiegelfähiger Vliesstoff.The spacing of the openings from one another can be varied over a wide range down to fiber thickness dimensions, as can the size of the openings. This advantageous embodiment allows heat and pressure to act on the nonwoven fabric so that it can penetrate on all sides with the heat-sealable components; the composite thus behaves like a single-layer, heat-sealable nonwoven.

Das Herstellungsverfahren für den erfindungsgemäßen Vlies­stoff erfolgt zweckmäßig analog dem eingangs dargelegten, in GB-B 1,117,751 beschriebenen Extrusions- oder Schmelz­blasverfahren, wobei die erste Vliesstoffschicht den kon­tinuierlich bewegten textilen Träge bildet, auf welchen die zweite, heißsiegelfähige Faserschicht dauerhaft fixiert wird.The manufacturing process for the nonwoven fabric according to the invention is advantageously carried out analogously to the extrusion or meltblowing process described at the beginning, described in GB-B 1,117,751, the first nonwoven fabric layer forming the continuously moving textile backing on which the second heat-sealable fiber layer is permanently fixed.

Der erfindungsgemäße, heißsiegelfähige Verbundstoff besitzt eine überraschend verbesserte Zugfestigkeit, eine gute Haf­tung auf Oberstoffen, wie z. B. Baumwolle/Polyester, Poly­ester, Nylon oder Baumwolle, sowie eine einfachere Herstell­barkeit, ohne dabei eine Zwischenträgerschicht zu benötigen. Diese verbesserten Eigenschaften erweitern das Anwendungs­gebiet eines solchen Vliesstoffverbundes auf solche Fälle, wo hohe Zugfestigkeiten zwingend erforderlich sind und wo die bisherigen heißsiegelfähigen Vliesstoffe daher versa­gen mußten.The heat-sealable composite according to the invention has a surprisingly improved tensile strength, good adhesion to outer materials, such as. As cotton / polyester, polyester, nylon or cotton, and easier to manufacture, without the need for an intermediate support layer. These improved properties extend the field of application of such a nonwoven composite to those cases where high tensile strengths are absolutely necessary and where the previous heat-sealable nonwovens had to fail.

Die anliegende Figur ist die fotografische Aufsicht auf die zweite Schicht des erfindungsgemäßen Vliesstoffs, der Maß­stab ist 1:0,97.The figure attached is the photographic top view of the second layer of the nonwoven according to the invention, the scale is 1: 0.97.

Die folgenden Beispiele sollen Variationen des Aufbaues und mögliche Herstellungsverfahren für den erfindungsgemäßen Vliesstoffverbund aufzeigen.The following examples are intended to show variations in the structure and possible manufacturing processes for the nonwoven composite according to the invention.

Beispiel 1 AExample 1A

Ein Vliesstoff mit 12 g/m² wurde durch Kardieren einer Mi­schung aus 30 Gew.-% thermisch klebefähiger Copolyesterfa­sern (3,5 den bei 38 mm Stapellänge, Schmelzpunkt bei 130°C) und 70 Gew.-% Polyethylenterephthalat-Stapelfasern (3,0 den bei 50 mm Stapellänge) hergestellt. Die Faserbindung erfolg­te durch eine handelsübliche Polymerbindemittel-Dispersion auf Basis Polyester. Anschließend wurde mit einem satz mehr­rerer dampfbeheizter Trockenzylinder bei einem Schließdruck von 1,41 bis 2,11 kp/cm² (20 bis 30 psi) getrocknet.A 12 g / m² nonwoven was made by carding a mixture of 30% by weight thermally adhesive copolyester fibers (3.5 den at 38 mm stack length, melting point at 130 ° C.) and 70% by weight polyethylene terephthalate staple fibers (3.0 manufactured at 50 mm stack length). The fibers were bonded using a commercially available polymer binder dispersion based on polyester. It was then dried with a set of multiple steam-heated drying cylinders at a closing pressure of 1.41 to 2.11 kp / cm² (20 to 30 psi).

Das Trockengewicht des zugefügten Binders betrug 4 g/m² bei einem Gesamtgewicht von 16 g/m². Das Verhältnis Faser : Bindemittel im Vliesstoff betrug 75:25, seine Dichte war 0,039 g/cm³.The dry weight of the added binder was 4 g / m² with a total weight of 16 g / m². The fiber: binder ratio in the nonwoven fabric was 75:25, its density was 0.039 g / cm³.

Beispiel 1 BExample 1 B

Der Vliesstoff aus Beispiel 1 A wurde mit einem heißsiegel­fähigen Faserflächengebilde aus Copolyesterfilamenten verse­hen und besaß ein Gewicht von 50 g/m². Die Copolyesterfila­mente hatten einen Erweichungsbereich von 130 bis 135°C. Ein Verbundstoff wurde erzeugt durch kombinierte Anwendung von Hitze und Druck mittels Kalanderwalzen. Die Temperatur be­trug dabei 85°C, der Schließdruck war 1,41 kp/cm² (20 psi).The nonwoven fabric from Example 1A was provided with a heat-sealable fiber sheet made of copolyester filaments and had a weight of 50 g / m². The copolyester filaments had a softening range of 130 to 135 ° C. A composite was created by the combined application of heat and pressure using calender rolls. The temperature was 85 ° C, the closing pressure was 1.41 kp / cm² (20 psi).

Beispiel 2 AExample 2A

Ein Vliesstoff mit 17 g/m² wurde wie in Beispiel 1 A her­gestellt und enthielt neben den Polyethylenterphthalatfa­sern 30 Gew.-% thermisch klebefähige Coplyesterfasern (Schmelzbereich um 130°C).A 17 g / m² nonwoven fabric was produced as in Example 1A and, in addition to the polyethylene terephthalate fibers, contained 30% by weight of thermally adhesive copolymer fibers (melting range around 130 ° C.).

Das Gesamtgewicht des bindemittelgebundenen Vliesstoffes betrug 22 g/m².The total weight of the binder-bound nonwoven was 22 g / m².

Beispiel 2 BExample 2 B

Die Laminierung dieses Vliesstoffes wurde wie in Beispiel 1 B durchgeführt, wobei jedoch das heißsiegelfähige Flächen­gebilde ein Gewicht von 62 g/m² besaß.The lamination of this nonwoven fabric was carried out as in Example 1B, but the heat-sealable fabric had a weight of 62 g / m 2.

Beispiel 3 AExample 3 A

Ein Vliesstoff von 14 g/m² wurde wie in Beispiel 1 A her­gestellt, jedoch mit einem Fasermischungs-Verhältnis von 1:1. Nach dem Ausrüsten mit Bindemittel betrug das Gesamt­gewicht des Vliesstoffes (trocken) 18 g/m².A 14 g / m² nonwoven fabric was made as in Example 1A but with a fiber blend ratio of 1: 1. After finishing with binder, the total weight of the nonwoven fabric (dry) was 18 g / m².

Beispiel 3 BExample 3 B

Der Vliesstoff aus Beispiel 3 A wurde analog Beispiel 1 B mit dem heißsiegelfähigen Faserflächengebilde laminiert, wobei jedoch dessen Gewicht 80 g/m², sein Schmelzbereich 110 bis 115°C und die Kalandriertemperatur 70°C betrugen.The nonwoven fabric from Example 3A was laminated with the heat-sealable fibrous sheet material analogously to Example 1B, but its weight was 80 g / m², its melting range was 110 to 115 ° C. and the calendering temperature was 70 ° C.

Beispiel 4 AExample 4 A

Ein Vliesstoff von 10 g/m² mit den Fasern aus Beispiel 1 A, jedoch 60 Gew.-% thermisch klebefähigen Copolyesterfasern, wurde verfestigt mittels eines auf 105°C beheizten Kalan­ders bei einem Liniendruck von 20 kp/cm.A nonwoven fabric of 10 g / m² with the fibers from Example 1A, but 60% by weight of thermally adhesive copolyester fibers, was consolidated by means of a calender heated to 105 ° C. at a line pressure of 20 kp / cm.

Beispiel 4 BExample 4 B

Der Vliesstoff aus Beispiel 4 A wurde mit einem heißsiegel­fähigen Faserflächengebilde laminiert. Dieses besaß ein Ge­wicht von 50 g/m² und enthielt ein Terpolyamid aus Nylon 6, 66 and 12 mit einem Schmelzbereich von 110 bis 120°C.The nonwoven fabric from Example 4 A was laminated with a heat-sealable fiber sheet. This had a weight of 50 g / m² and contained a terpolyamide made of nylon 6, 66 and 12 with a melting range of 110 to 120 ° C.

Das Laminieren zu einem composite erfolgte mittels auf 70°C beheizter Kalanderwalze bei einem Schließdruck von 1,41 kp/cm² (20 psi).Lamination to a composite was carried out using a calender roll heated to 70 ° C. at a closing pressure of 1.41 kp / cm² (20 psi).

Alle diese erfindungsgemäßen Schichtstoffe wiesen deutlich verbesserte Zugfestigkeiten, verglichen mit einschichtigen heißsiegelfähigen Stoffen, auf, wie die folgende Tabelle zeigt:

Figure imgb0002
All of these laminates according to the invention had significantly improved tensile strengths compared to single-layer heat-sealable materials, as the following table shows:
Figure imgb0002

Claims (3)

1. Zweischichtiger, heißsiegelfähiger Vliesstoff mit einem Flächengewicht von 10 bis 180 g/m², enthaltend eine erste Schicht aus schmelzbaren, miteinander verbunde­nen, wirr verteilten Polymerfilamenten und gegebenen­falls aus parallelen Polymerfilamenten, und ein mit die­ser ersten Schicht verbundenes, in sich verfestigtes Fa­serflächengebilde als zweite Schicht,
dadurch gekennzeichnet, daß die zweite Schicht zu 10 bis 90 Gew.-% heißsiegelfähige Fasern enthält, die aus Co-, Ter- oder höheren Polyestern oder ebensolchen Po­lyamiden aufgebaut sind, daß die Schmelzbereiche dieser Fasern zwischen 75 und 140°C liegen und daß der Gehalt an schmelzfähigen Fasern und Filamenten im gesamten Vliesstofflaminat 40 bis 98 Gew.-% beträgt.1. Two-layer, heat-sealable nonwoven fabric with a weight per unit area of 10 to 180 g / m 2, containing a first layer of meltable, interconnected, randomly distributed polymer filaments and optionally of parallel polymer filaments, and a self-solidified fiber sheet structure connected to this first layer as the second Layer,
characterized in that the second layer contains 10 to 90 wt .-% heat-sealable fibers which are composed of Co-, Ter- or higher polyesters or such polyamides, that the melting ranges of these fibers are between 75 and 140 ° C and that The content of meltable fibers and filaments in the entire nonwoven laminate is 40 to 98% by weight. 2. Vliesstoff nach Anspruch 1, dadurch gekennzeichnet, daß das Flächengewicht der zweiten Vliesstoffschicht 5 bis 60% des gesamten Laminates beträgt.2. Nonwoven according to claim 1, characterized in that the weight per unit area of the second nonwoven layer is 5 to 60% of the total laminate. 3. Vliesstoff nach Anspruch 1 oder 2, dadurch gekennzeich­net, daß die zweite Vliesstoffschicht unregelmäßig ver­teilte Öffnungen von 0,5 bis 5 mm Breite und 1 bis 50 mm Länge enthält, wobei das Verhältnis von Breite zu Länge 1:20 bis 1:100 beträgt.3. Nonwoven fabric according to claim 1 or 2, characterized in that the second nonwoven layer contains irregularly distributed openings of 0.5 to 5 mm in width and 1 to 50 mm in length, the ratio of width to length being 1:20 to 1: 100 .
EP87108537A 1987-03-13 1987-06-12 Two-layered thermofusible non-woven fabric Ceased EP0281663A3 (en)

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US25459 1987-03-13
US07/025,459 US4906507A (en) 1987-03-13 1987-03-13 Composite adhesive webs and their production

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