EP0053748B1 - Micro-wave reflexion of metallised textile articles - Google Patents

Micro-wave reflexion of metallised textile articles Download PDF

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Publication number
EP0053748B1
EP0053748B1 EP81109830A EP81109830A EP0053748B1 EP 0053748 B1 EP0053748 B1 EP 0053748B1 EP 81109830 A EP81109830 A EP 81109830A EP 81109830 A EP81109830 A EP 81109830A EP 0053748 B1 EP0053748 B1 EP 0053748B1
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EP
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Prior art keywords
metallized
impregnation
polymer
reflexion
micro
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EP81109830A
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German (de)
French (fr)
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EP0053748A2 (en
EP0053748A3 (en
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Hans Georg Dr. Fitzky
Harold Dr. Ebneth
Wolfgang Dr. Oberkirch
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Bayer AG
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Bayer AG
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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06Q—DECORATING TEXTILES
    • D06Q1/00—Decorating textiles
    • D06Q1/04—Decorating textiles by metallising
    • 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
    • D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
    • D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
    • D06M15/21—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D06M15/227—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of hydrocarbons, or reaction products thereof, e.g. afterhalogenated or sulfochlorinated
    • 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
    • D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
    • D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
    • D06M15/21—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D06M15/244—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of halogenated hydrocarbons
    • D06M15/256—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of halogenated hydrocarbons containing fluorine
    • 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
    • D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
    • D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
    • D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D06M15/564—Polyureas, polyurethanes or other polymers having ureide or urethane links; Precondensation products forming them
    • 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
    • D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
    • D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
    • D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D06M15/643—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds containing silicon in the main chain

Definitions

  • Textile fabrics which have been electrolessly wet-chemically metallized according to DE-B-2 743 768 have, according to DE-A-2 847 485, good reflection properties for microwaves even with a low thickness of the metal layer.
  • the textile properties that have been preserved regardless of the metallization, in particular the low weight and the high textile elastic flexibility enable special applications in radar technology, for example in the manufacture of foldable reflectors for active and passive emitters, as well as radar reflecting material in the area of sea rescue, especially for reflectors, life jackets, roofs of lifeboat islands, oil tools etc. or to support radar detection in cases of object and person localization, e.g. tents, parachutes, backpacks, anoraks etc.
  • the invention therefore relates to a method for treating metallized textile fabrics to increase the microwave reflection in the frequency range from 1 to 1000 GHz, which is characterized in that the metallized textile fabric is space-filling with a polymer whose dielectric loss factor tg O'in the microwave range below 0.01 lies, impregnated.
  • space-filling impregnation means that the space between the warp and weft threads of the metallized fabric is filled as completely as possible by the polymer applied by the impregnation and, in addition, the metallized warp and weft threads are provided with a polymer layer, specifically so that one microscopic image with a magnification factor of 10 4 in the composite metallized fiber-polymer no voids are found that make up more than 10%, preferably more than 5%, of the cross-sectional area.
  • the layer thickness of the polymer applied to the metallized fibers is preferably at most 10% of the wavelength, in particular at most 1 to 3% of the wavelength.
  • the polymer to be applied by impregnation is selected so that it imparts water-repellent properties to the metallized fibers. This can contribute to a further reduction in reflection losses, for example when used in the context of sea rescue, where the highest possible contrast to the relatively well reflecting surface of the lake is desired, especially in waves.
  • the impregnation with the polymer is preferably carried out by treatment with a polymer solution, with a polymer dispersion or with a polymer melt, the treatment method depending on the nature of the polymers in individual cases.
  • the effect of reducing the reflection losses as a result of the impregnation is particularly pronounced for high frequencies (small wavelengths).
  • the reflection losses increase with falling wavelength due to the finite mesh size of the woven, knitted or non-woven fabrics used.
  • filament yarn fabrics with a very small mesh size are required.
  • the impregnation of the metallized textile fiber materials according to the invention enables a further improvement and the expansion of the field of application of metallized textile reflection materials to frequencies above 100 GHz, or the use of coarser-meshed and cheaper fabrics at frequencies in the range from approximately 10 to 100 GHz.
  • the impregnation material may optionally contain additional fillers, for example visible colorations with signal and warning colors, preferably those with low dielectric losses, e.g. B. alumina or titanium dioxide.
  • the textile metallized fabric is preferably metallized with nickel, but copper and gold are also suitable as metals to be applied.
  • the textile fabric is preferably a woven fabric, knitted fabric, knitted fabric, needle felt or fleece or is paper.
  • the metal coating preferably has a layer thickness of at least 0.05 ⁇ m. In general, metal layer thicknesses of 0.1 to 0.8 ⁇ m are sufficient to achieve good reflection values in the range from 0.01 to over 100 GHz. The metal layer is better protected against mechanical or chemical damage by the impregnation according to the invention compared to non-coated materials.
  • Suitable fiber materials are native fibers such as cotton, fibers made from organic polymers such as polyamide, polyester and polyacrylonitrile fibers, and glass fibers and carbon fibers, the textile fabrics made from these fibers preferably be made from appropriate filament yarns. Filament yarn fabrics made from the materials mentioned are preferably used.
  • tg d The so-called loss factor is understood as tg d. It is: ie tg ⁇ is the quotient of the imaginary part and the real part of the dielectric constant (Handbook for high-frequency and electrical engineers, C. Rint, ed., Wegig and Pflaum-Verlag Kunststoff-Heidelberg 1978, Vol. 2, p. 425 ff).
  • Nickel-plated polyester-cotton fabric 65/35 basis weight 152 g / m 2 , nickel content 23 g Ni / m 2 , impregnated on both sides with a 30% solution of a commercially available polyester polyurethane in ethyl acetate and dried.
  • Basis weight of the coated fabric 185 g / m 2 .
  • Nickel-plated polyester-cotton fabric from example 1 without impregnation.
  • Nickel-plated polyester-cotton fabric from example 2 without impregnation.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)

Description

Textile Flächengebilde, die stromlos naßchemisch nach DE-B-2 743 768 metallisiert worden sind, besitzen gemäß DE-A-2 847 485 selbst bei geringer Stärke der Metallschicht gute Reflektionseigenschaften für Mikrowellen. Die unabhängig von der Metallisierung erhalten gebliebenen textilen Eigenschaften, insbesondere das geringe Gewicht und die hohe textilelastische Flexibilität ermöglichen spezielle Anwendungen in der Radar-Technik, beispielsweise bei der Herstellung von zusammenfaltbaren Reflektoren für aktive und passive Strahler, ferner als radarreflektierendes Material im Bereich der Seenotrettung, insbesondere bei Reflektoren, Schwimmwesten, Dächern von Seenotrettungsinseln, Ölzeug usw. oder zur Unterstützung der Radar-Ortung in Fällen der Objekt- und Personen-Lokalisierung, beispielsweise bei Zelten, Fallschirmen, Rucksäcken, Anoraks usw.Textile fabrics which have been electrolessly wet-chemically metallized according to DE-B-2 743 768 have, according to DE-A-2 847 485, good reflection properties for microwaves even with a low thickness of the metal layer. The textile properties that have been preserved regardless of the metallization, in particular the low weight and the high textile elastic flexibility enable special applications in radar technology, for example in the manufacture of foldable reflectors for active and passive emitters, as well as radar reflecting material in the area of sea rescue, especially for reflectors, life jackets, roofs of lifeboat islands, oil tools etc. or to support radar detection in cases of object and person localization, e.g. tents, parachutes, backpacks, anoraks etc.

Mit metallisierten textilen Materialien lassen sich im allgemeinen Reflektionsverluste im Mikrowellengebietvon weniger als 5 bis 20%, verglichen mit der einer ebenen Metallplatte erzielen. Wenn auch im allgemeinen eine Ortung solcher Gegenstände gut möglich ist, so treten doch insbesondere bei der Seenotrettung und da vor allem bei bewegter See, die selbst über eine verhältnismäßig gute Mikrowellenreflektionseigenschaft verfügt, Probleme auf, die es notwendig machen, die Reflektionsverluste der metallisierten textilen Materialien im Mikrowellengebiet noch weiter zu senken.With metallized textile materials, reflection losses in the microwave region of less than 5 to 20% can generally be achieved compared to that of a flat metal plate. Although it is generally possible to locate such objects, problems arise in sea rescue and especially when the sea is moving, which itself has a relatively good microwave reflection property, which makes it necessary to avoid the reflection losses of the metallized textile materials in the microwave region even further.

Aus der bereits genannten DE-A-2 847 485 ist weiterhin bekannt, daß die Reflektionsverluste nicht oder nur wenig schlechter werden, wenn das metallisierte Gewebe mit einem schützenden Überzug aus PVC, Gummi, Polyurethanlack oder Polyethylen versehen wird.From the already mentioned DE-A-2 847 485 it is also known that the reflection losses do not become, or only slightly worse, if the metallized fabric is provided with a protective coating of PVC, rubber, polyurethane lacquer or polyethylene.

Es wurde nun überraschenderweise gefunden, daß unter bestimmten Bedingungen das Imprägnieren der metallisierten textilen Flächengebilde mit Polymeren zu einer überraschenden Verminderung der Reflektionsverluste führt.It has now surprisingly been found that, under certain conditions, the impregnation of the metallized textile fabrics with polymers leads to a surprising reduction in the reflection losses.

Die Erfindung betrifft daher ein Verfahren zum Behandeln metallisierter textiler Flächengebilde zur Erhöhung der Mikrowellenreflektion im Frequenzbereich von 1 bis 1000 GHz, das dadurch gekennzeichnet ist, daß man das metallisierte textile Flächengebilde raumerfüllend mit einem Polymer, dessen dielektrischer Verlustfaktor tg O'im Mikrowellenbereich unter0,01 liegt, imprägniert.The invention therefore relates to a method for treating metallized textile fabrics to increase the microwave reflection in the frequency range from 1 to 1000 GHz, which is characterized in that the metallized textile fabric is space-filling with a polymer whose dielectric loss factor tg O'in the microwave range below 0.01 lies, impregnated.

Raumerfüllende Imprägnierung bedeutet in diesem Zusammenhang, daß der Zwischenraum zwischen Kett- und Schußfäden des metallisierten Gewebes von dem durch die Imprägnierung aufgebrachten Polymer möglichst vollständig ausgefüllt wird und darüber hinaus die metallisierten Kett-und Schußfäden mit einer Polymerschicht versehen werden, und zwar so daß bei einer mikroskopischen Aufnahme mit einem Vergrößerungsfaktor 104 im Verbund metallisierte Faser-Polymer keine Hohlräume festgestellt werden, die mehr als 10%, vorzugsweise mehr als 5%, der Querschnittsfläche ausmachen. Die Schichtdicke des auf die metallisierten Fasern aufgebrachten Polymers beträgt vorzugsweise maximal 10% der Wellenlänge, insbesondere maximal 1 bis 3% der Wellenlänge.In this context, space-filling impregnation means that the space between the warp and weft threads of the metallized fabric is filled as completely as possible by the polymer applied by the impregnation and, in addition, the metallized warp and weft threads are provided with a polymer layer, specifically so that one microscopic image with a magnification factor of 10 4 in the composite metallized fiber-polymer no voids are found that make up more than 10%, preferably more than 5%, of the cross-sectional area. The layer thickness of the polymer applied to the metallized fibers is preferably at most 10% of the wavelength, in particular at most 1 to 3% of the wavelength.

Vorzugsweise wird das durch Imprägnierung aufzubringende Polymer so ausgewählt, daß es den metallisierten Fasern wasserabstoßende Eigenschaften verleiht. Dies kann zu einer weiteren Verringerung der Reflektionsverluste, beispielsweise beim Einsatz im Rahmen der Seenotrettung, wo ein höchstmöglicher Kontrast zur ebenfalls relativ gut reflektierenden Seeoberfläche, insbesondere bei Wellengang, erwünscht ist, beitragen.Preferably, the polymer to be applied by impregnation is selected so that it imparts water-repellent properties to the metallized fibers. This can contribute to a further reduction in reflection losses, for example when used in the context of sea rescue, where the highest possible contrast to the relatively well reflecting surface of the lake is desired, especially in waves.

Die Imprägnierung mit dem Polymer wird vorzugsweise durch Behandlung mit einer Polymerlösung, mit einer Polymerdispersion oder einer Polymerschmelze durchgeführt, wobei sich im Einzelfall die Behandlungsmethode nach der Natur der Polymere richtet.The impregnation with the polymer is preferably carried out by treatment with a polymer solution, with a polymer dispersion or with a polymer melt, the treatment method depending on the nature of the polymers in individual cases.

Der Effekt der Verminderung der Reflektionsverluste als Folge der Imprägnierung ist insbesondere für hohe Frequenzen (kleine Wellenlängen) gut ausgeprägt. Erfahrungsgemäß nehmen die Reflektionsverluste mit fallender Wellenlänge auf Grund der endlichen Maschenweite der verwendeten Gewebe, Gestricke oder Vliese zu. Für eine gute Reflektion im Bereich der Millimeterwellen sind daher gut plane und vor allem dichte Gewebe, vorzugsweise Filamentgarngewebe mit sehr kleiner Maschenweite (möglichst unter 10% der Wellenlänge), erforderlich. Durch die erfindungsgemäße Imprägnierung der metallisierten textilen Fasermaterialien wird hier eine weitere Verbesserung und die Ausdehnung des Anwendungsbereichs metallisierter textiler Reflektionsmaterialien auf Frequenzen oberhalb 100 GHz, bzw. den Einsatz grobmaschigerer und preiswerterer Gewebe bei Frequenzen im Bereich von ca. 10 bis 100 GHz, möglich.The effect of reducing the reflection losses as a result of the impregnation is particularly pronounced for high frequencies (small wavelengths). Experience has shown that the reflection losses increase with falling wavelength due to the finite mesh size of the woven, knitted or non-woven fabrics used. For a good reflection in the range of millimeter waves, therefore, well-planed and above all dense fabrics, preferably filament yarn fabrics with a very small mesh size (if possible less than 10% of the wavelength) are required. The impregnation of the metallized textile fiber materials according to the invention enables a further improvement and the expansion of the field of application of metallized textile reflection materials to frequencies above 100 GHz, or the use of coarser-meshed and cheaper fabrics at frequencies in the range from approximately 10 to 100 GHz.

Das Imprägnierungsmaterial kann gegebenenfalls zusätzliche Füllstoffe, zum Beispiel im sichtbaren Bereich erkennbare Färbungen mit Signal- und Warnfarben, enthalten, vorzugsweise solche mit niedrigen dielektrischen Verlusten, z. B. Aluminiumoxid oder Titandioxid. Das textile metallisierte Flächengebilde ist vorzugsweise mit Nickel metallisiert, jedoch kommen auch Kupfer und Gold als aufzubringende Metalle in Frage. Das textile Flächengebilde ist vorzugsweise ein Gewebe, Gestrick, Gewirk, Nadelfilz oder Vlies oder ist Papier. Der Metallüberzug weist vorzugsweise eine Schichtdicke von mindestens 0,05 jlm auf. Im allgemeinen sind Metallschichtdicken von 0,1 bis 0,8 jlm zur Erzielung guter Reflektionswerte im Bereich von 0,01 bis über 100 GHz ausreichend. Die Metallschicht wird durch die erfindungsgemäße Imprägnierung gegenüber nichtbeschichteten Materialien vor mechanischer oder chemischer Schädigung besser geschützt. Als Fasermaterialien kommen native Fasern wie Baumwolle, Fasern aus organischen Polymeren wie Polyamid-, Polyester- und Polyacrylnitrilfasern sowie Glasfasern und Kohlenstoffasern in Frage, wobei die textilen Flächengebilde aus diesen Fasern vorzugsweise aus entsprechenden Filamentgarnen hergestellt werden. Vorzugsweise verwendet man Filamentgarngewebe aus den genannten Materialien.The impregnation material may optionally contain additional fillers, for example visible colorations with signal and warning colors, preferably those with low dielectric losses, e.g. B. alumina or titanium dioxide. The textile metallized fabric is preferably metallized with nickel, but copper and gold are also suitable as metals to be applied. The textile fabric is preferably a woven fabric, knitted fabric, knitted fabric, needle felt or fleece or is paper. The metal coating preferably has a layer thickness of at least 0.05 μm. In general, metal layer thicknesses of 0.1 to 0.8 μm are sufficient to achieve good reflection values in the range from 0.01 to over 100 GHz. The metal layer is better protected against mechanical or chemical damage by the impregnation according to the invention compared to non-coated materials. Suitable fiber materials are native fibers such as cotton, fibers made from organic polymers such as polyamide, polyester and polyacrylonitrile fibers, and glass fibers and carbon fibers, the textile fabrics made from these fibers preferably be made from appropriate filament yarns. Filament yarn fabrics made from the materials mentioned are preferably used.

Geeignete Polymere sind beispielsweise Polyethylen (tg δ = 0,0002), Polystyrol (tg δ = 0,00015), Polytetrafluorethylen (tg δ = 0,0001), Siliconharz (tg δ = 0,001) sowie Polyurethan, insbesondere Polyesterurethane (tg δ = 0,008). Unter diesen Materialien sind solche bevorzugt, deren Dielektrizitätskonstante über 2 liegt.Suitable polymers are, for example, polyethylene (tg δ = 0.0002), polystyrene (tg δ = 0.00015), polytetrafluoroethylene (tg δ = 0.0001), silicone resin (tg δ = 0.001) and polyurethane, in particular polyester urethanes (tg δ = 0.008). Preferred among these materials are those whose dielectric constant is above 2.

Unter tg dwird der sogenannte Verlustfaktor verstanden. Es ist:

Figure imgb0001
d. h. tg δ ist der Quotient von Imginärteil und Realteil der Dielektrizitätskonstante (Handbuch für Hochfrequenz- und Elektrotechniker, C. Rint, ed., Hüthig und Pflaum-Verlag München-Heidelberg 1978, Bd. 2, S. 425 ff).The so-called loss factor is understood as tg d. It is:
Figure imgb0001
 ie tg δ is the quotient of the imaginary part and the real part of the dielectric constant (Handbook for high-frequency and electrical engineers, C. Rint, ed., Hüthig and Pflaum-Verlag Munich-Heidelberg 1978, Vol. 2, p. 425 ff).

Die Verlustleistung im Dielektrikum ist Nv = Io · w - tg δ mit Io = einfallende Intensität der Mikrowellenstrahlung, ω = Frequenz und tg δ = Verlustfaktor des Dielektrikums (Polymermaterial).The power loss in the dielectric is N v = I o · w - tg δ with I o = intensity of incident microwave radiation, ω = frequency and tan δ = dissipation factor of the dielectric (polymer material).

Beispiel 1example 1

Vernickeltes Polyester-Baumwoll-Gewebe 65/35, Flächengewicht 152 g/m2, Nickelgehalt 23 g Ni/m2, beidseitig mit einer 30%igen Lösung eines handelsüblichen Polyesterpolyurethans in Ethylacetat imprägniert und getrocknet. Flächengewicht des beschichteten Gewebes 185 g/m2.Nickel-plated polyester-cotton fabric 65/35, basis weight 152 g / m 2 , nickel content 23 g Ni / m 2 , impregnated on both sides with a 30% solution of a commercially available polyester polyurethane in ethyl acetate and dried. Basis weight of the coated fabric 185 g / m 2 .

Vergleichsbeispiel AComparative Example A

Vernickeltes Polyester-Baumwoll-Gewebe aus Beispiel 1 ohne Imprägnierung.Nickel-plated polyester-cotton fabric from example 1 without impregnation.

Beispiel 2Example 2

Vernickeltes Polyester-Baumwoll-Gewebe 65/35, Flächengewicht 137 g/m2, Nickelgehalt 21 g/m2, beidseitig mit einer rußhaltigen 30%igen Lösung eines Polyesterpolyurethans in Ethylacetat (Gewichtsverhältnis Ruß: Polyurethan = 15 : 85) imprägniert und getrocknet; Flächengewicht des beschichteten Gewebes 223 g/m2.Nickel-plated polyester-cotton fabric 65/35, basis weight 137 g / m 2 , nickel content 21 g / m 2 , impregnated on both sides with a soot-containing 30% solution of a polyester polyurethane in ethyl acetate (weight ratio carbon black: polyurethane = 15:85) and dried; Basis weight of the coated fabric 223 g / m 2 .

Vergleichsbeispiel BComparative Example B

Vernickeltes Polyester-Baumwoll-Gewebe aus Beispiel 2 ohne Imprägnierung.Nickel-plated polyester-cotton fabric from example 2 without impregnation.

Die Ergebnisse der Reflexionsmessung gehen aus Tabelle 1 hervor.

Figure imgb0002
The results of the reflection measurement are shown in Table 1.
Figure imgb0002

Die in Klammern angegebenen Werte wurden nach Drehung der Proben um 90° erhalten, die Unterschiede kommen durch die Unsymmetrie des Gewebeaufbaus zustande.The values given in brackets were obtained after rotating the samples by 90 °, the differences are due to the asymmetry of the tissue structure.

Claims (2)

1. Process for treating metallised sheet-form textiles with polymers for the purpose of increasing the microwave reflection in the frequency range of 1 to 1,000 GHz, characterised in that the metallised sheet-form textile is subjected to space-filling impregnation with a polymer having a dielectric loss factortg δin the microwave region of less than 0.01.
2. Process according to Claim 1, characterised in that a solution of a polyester polyurethane containing carbon black is used for the space-filling impregnation.
EP81109830A 1980-12-04 1981-11-23 Micro-wave reflexion of metallised textile articles Expired EP0053748B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19803045790 DE3045790A1 (en) 1980-12-04 1980-12-04 IMPROVING THE MICROWAVE REFLECTION OF METALLIZED TEXTILE SURFACES
DE3045790 1980-12-04

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EP0053748A2 EP0053748A2 (en) 1982-06-16
EP0053748A3 EP0053748A3 (en) 1982-09-01
EP0053748B1 true EP0053748B1 (en) 1984-07-18

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3712192A1 (en) * 1987-04-10 1988-10-27 Alban Puetz METALIZED TEXTILE TRACK AND METHOD FOR THE PRODUCTION THEREOF
CN1099444C (en) * 1998-09-01 2003-01-22 中国科学院物理研究所 Microwave dielectric material and preparation method thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB639740A (en) * 1947-10-21 1950-07-05 Suchy Holdings Ltd Improvements in and relating to radar reflection surfaces
GB810814A (en) * 1956-05-24 1959-03-25 Raymond De Icer And Engineerin Antennas and material for the manufacture thereof
ZA751636B (en) * 1975-03-17 1976-04-28 Oth Beier & Co Ltd Improvements in the coating of open mesh material
DE2847486A1 (en) * 1978-11-02 1980-05-14 Bayer Ag USE OF METALIZED TEXTILES AS A RADIATION PROTECTION AGAINST MICROWAVES
DE3017204A1 (en) * 1980-05-06 1981-11-12 Bayer Ag, 5090 Leverkusen METHOD FOR COATING FLAT AREAS FROM METALLIZED TEXTILE FIBERS AND THE USE THEREOF FOR THE PRODUCTION OF MICROWAVE REFLECTING OBJECTS

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EP0053748A2 (en) 1982-06-16
DE3045790A1 (en) 1982-07-08
EP0053748A3 (en) 1982-09-01
DE3162699D1 (en) 1984-04-19

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