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EP3757268B1 - Method for producing and/or finishing a glass mat sheet - Google Patents

Method for producing and/or finishing a glass mat sheet Download PDF

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Publication number
EP3757268B1
EP3757268B1 EP20174303.6A EP20174303A EP3757268B1 EP 3757268 B1 EP3757268 B1 EP 3757268B1 EP 20174303 A EP20174303 A EP 20174303A EP 3757268 B1 EP3757268 B1 EP 3757268B1
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Prior art keywords
dryer
infrared radiation
hot air
glass fabric
fabric web
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EP20174303.6A
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German (de)
French (fr)
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EP3757268A1 (en
Inventor
Philipp KÜCKMANN
Franziska FERRER
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Voith Patent GmbH
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Voith Patent GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
    • F26B13/10—Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
    • F26B13/101—Supporting materials without tension, e.g. on or between foraminous belts
    • F26B13/104—Supporting materials without tension, e.g. on or between foraminous belts supported by fluid jets only; Fluid blowing arrangements for flotation dryers, e.g. coanda nozzles
    • 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
    • D06M10/00—Physical treatment of fibres, threads, yarns, fabrics, or fibrous goods made from such materials, e.g. ultrasonic, corona discharge, irradiation, electric currents, or magnetic fields; Physical treatment combined with treatment with chemical compounds or elements
    • D06M10/001—Treatment with visible light, infrared or ultraviolet, X-rays
    • 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
    • D04H1/4209—Inorganic fibres
    • D04H1/4218—Glass fibres
    • D04H1/4226—Glass fibres characterised by the apparatus for manufacturing the glass fleece
    • 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
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/58—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives
    • D04H1/64—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives the bonding agent being applied in wet state, e.g. chemical agents in dispersions or solutions
    • D04H1/655—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives the bonding agent being applied in wet state, e.g. chemical agents in dispersions or solutions characterised by the apparatus for applying bonding agents
    • 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
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/002—Inorganic yarns or filaments
    • D04H3/004—Glass yarns or filaments
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
    • F26B3/04—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour circulating over or surrounding the materials or objects to be dried
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/28—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun
    • F26B3/30—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun from infrared-emitting elements
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2101/00—Inorganic fibres
    • D10B2101/02—Inorganic fibres based on oxides or oxide ceramics, e.g. silicates
    • D10B2101/06—Glass

Definitions

  • the second embodiment of such a device for carrying out the method according to the invention differs only slightly from the one shown in Figure 1 illustrated first embodiment. Therefore, only the differences will be discussed below and reference is made to the above description.
  • the main difference is that the dryer in the second embodiment is designed as a combination dryer unit 12. Warm air from the used air discharge of the two modules 21, 22 of the infrared radiation dryer 20 is at least partially fed to the hot air dryer 30. This does not mean that the hot air dryer 30 is no longer connected to any other source of hot air, but the routing of hot air from the infrared radiation dryer 20 to the hot air dryer 30 helps to reduce the overall energy requirement.
  • the infrared radiation dryer 20 and the hot air dryer 30 of the combination dryer unit 12 can also have a common housing.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • General Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Drying Of Solid Materials (AREA)

Description

Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung und/oder Veredelung einer Glasvliesstoffbahn, wobei das Verfahren den folgenden Schritt umfasst: thermisches Trocknen der Glasvliesstoffbahn mittels Infrarotstrahlung aus einem Infrarotstrahlungstrockner.The present invention relates to a method for producing and/or finishing a glass nonwoven web, the method comprising the following step: thermally drying the glass nonwoven web by means of infrared radiation from an infrared radiation dryer.

Ein gattungsgemäßes Verfahren ist aus der Druckschrift WO 2018/142244 A1 bekannt. Der Vollständigkeit halber sei zudem auch noch auf die Entgegenhaltungen WO 88/03193 A und WO 2015/117927 A1 .A generic method is known from the publication WO 2018/142244 A1 For the sake of completeness, reference should also be made to the citations WO 88/03193 A and WO 2015/117927 A1 .

Bei der Veredelung von Glasvliesen wird häufig ein Strich auf selbige aufgetragen, analog wie dies beim Streichen von Papier bekannt ist. In der Regel erfolgt die anschließende Trocknung des Strichs mittels konventioneller Lufttrockner, die nach dem Prallströmprinzip funktionieren. Da Glasvliese jedoch, anders als Papier, eine hohe Porosität aufweisen, kann die Blasluft nur mit geringer Strömungsgeschwindigkeit auf die bestrichene Glasvliesoberfläche geblasen werden, um ein "Verblasen" des Strichs zu vermeiden. Als Folge hieraus ergeben sich geringe Wärmeübergangskoeffizienten und ein geringer Energieeintrag. Für den Strich bedeutet dies eine langsamere Immobilisierung.When finishing glass fleece, a coating is often applied to it, similar to the coating of paper. The coating is then usually dried using conventional air dryers that work according to the impingement flow principle. However, since glass fleece, unlike paper, has a high porosity, the blowing air can only be blown onto the coated glass fleece surface at a low flow rate in order to avoid "blowing away" the coating. This results in low heat transfer coefficients and a low energy input. For the coating, this means slower immobilization.

Analoges gilt auch für die Herstellung von Glasvliesen. Der bei der Herstellung aufgebrachte Binder kann ebenfalls durch zu hohe Luftgeschwindigkeiten "verblasen" werden, was zu einer Begrenzung des spezifischen Energieeintrags und damit zu einer langsamen Immobilisierung bzw. einer späteren Verfestigung des Glasvlieses führt.The same applies to the production of glass fleece. The binder applied during production can also be "blown away" by excessive air speeds, which limits the specific energy input and thus leads to slow immobilization or later solidification of the glass fleece.

In der DE 10 2016 120 933 A1 der Anmelderin wurde bereits vorgeschlagen, die Trocknung des Binders oder Strichs bei Glasvliesen mittels Infrarotstrahlung aus einem Infrarotstrahlungstrockner zumindest teilweise durchzuführen. Hierdurch wird die Gefahr des "Verblasens" reduziert und eine Immobilisierung des Strichs bzw. Verfestigung des Glasvlieses kann schneller erfolgen.In the EN 10 2016 120 933 A1 The applicant has already proposed that the drying of the binder or coating in glass fleeces be carried out at least partially by means of infrared radiation from an infrared radiation dryer. The risk of "blowing out" is reduced and immobilization of the line or solidification of the glass fleece can occur more quickly.

Nachteilig bei diesem bekannten Verfahren ist jedoch, dass die Immobilisierung des Strichs bzw. Verfestigung des Glasvlieses nach wie vor eine gewisse Zeit benötigt, was sich negativ auf die Produktionsmenge pro Zeit auswirkt.A disadvantage of this known process, however, is that the immobilization of the coating or solidification of the glass fleece still requires a certain amount of time, which has a negative effect on the production quantity per unit time.

Es ist Aufgabe der vorliegenden Erfindung, den zuvor genannten Nachteil aus dem Stand der Technik zumindest zu reduzieren.It is an object of the present invention to at least reduce the aforementioned disadvantage of the prior art.

Gelöst wird diese Aufgabe durch die Merkmale des unabhängigen Anspruchs. Die abhängigen Ansprüche haben vorteilhafte Weiterbildungen der Erfindung zum Gegenstand.This object is achieved by the features of the independent claim. The dependent claims relate to advantageous developments of the invention.

So wird erfindungsgemäß ein Verfahren zur Herstellung und/oder Veredelung einer Glasvliesstoffbahn gelehrt, welches den folgenden Schritt umfasst: thermisches Trocknen der Glasvliesstoffbahn mittels Infrarotstrahlung aus einem Infrarotstrahlungstrockner, und welches sich besonders dadurch auszeichnet, dass die dem Infrarotstrahlungstrockner zugewandte Oberfläche der Glasvliesstoffbahn durch den Infrarotstrahlungstrockner mit einer spezifischen Leistungsdichte von wenigstens 153 kW/m2 beaufschlagt wird, und dass die Glasvliesstoffbahn nach der Bestrahlung durch den Infrarotstrahlungstrockner eine Temperatur an ihrer dem Infrarotstrahlungstrockner zugewandten Oberfläche von wenigstens 40°C und höchstens 105°C aufweist.Thus, according to the invention, a method for producing and/or finishing a glass nonwoven web is taught, which comprises the following step: thermally drying the glass nonwoven web by means of infrared radiation from an infrared radiation dryer, and which is particularly characterized in that the surface of the glass nonwoven web facing the infrared radiation dryer is subjected to a specific power density of at least 153 kW/m 2 by the infrared radiation dryer, and that the glass nonwoven web, after irradiation by the infrared radiation dryer, has a temperature on its surface facing the infrared radiation dryer of at least 40°C and at most 105°C.

Die Erfinder haben herausgefunden, dass Glasvliesstoffe die Beaufschlagung mit einer derart hohen spezifischen Leistungsdichte, die wenigstens 153 kW/m2 beträgt, wider Erwartet unbeschadet überstehen, sofern dafür Sorge getragen wird, dass die Temperatur an der Oberfläche in einem moderaten Rahmen von 40°C bis 105°C bleibt. Die hohe spezifische Leistungsdichte erlaubt es, hohe Prozessgeschwindigkeiten zu fahren. Die Temperatur an der dem Infrarottrockner zugewandten Oberfläche des Infrarotstrahlungstrockners hängt maßgeblich ab von der Erstreckungslänge des Infrarotstrahlungstrockners in Prozessrichtung und von der Geschwindigkeit, mit der die Glasvliesstoffbahn relativ zu dem Infrarotstrahlungstrockner an diesem vorbeigeführt wird. Beide Faktoren haben einen Einfluss auf die Zeitdauer, mit welcher ein Flächenabschnitt der Glasvliesstoffbahn der Infrarotstrahlung des Infrarotstrahlungstrockners ausgesetzt ist.The inventors have discovered that glass fleeces can, contrary to expectations, withstand exposure to such a high specific power density, which is at least 153 kW/m 2 , without damage, provided that care is taken to ensure that the temperature on the surface remains within a moderate range of 40°C to 105°C. The high specific power density allows high process speeds to be achieved. The temperature on the surface of the infrared radiation dryer facing the infrared dryer depends largely on the length of the infrared radiation dryer in the process direction and on the speed at which the glass fleece web is guided past the infrared radiation dryer relative to it. Both factors have an Influence on the duration of time for which a surface section of the glass nonwoven web is exposed to the infrared radiation of the infrared radiation dryer.

Soll die Glasvliesstoffbahn durch das Aufbringen eines Strichs veredelt werden, so wird dieser vorzugsweise unmittelbar vor dem Trocknen der Glasvliesstoffbahn mittels Infrarotstrahlung aus dem Infrarotstrahlungstrockner auf die dem Infrarotstrahlungstrockner zugewandten Oberfläche der Glasvliesstoffbahn aufgebracht. "Unmittelbar" bedeutet in diesem Zusammenhang, dass keine anderen Maschinenaggregate zwischen dem Auftragswerk und dem Infrarotstrahlungstrockner vorgesehen sein sollen. Somit kann die Wegstrecke zwischen Auftragswerk und Infrarotstrahlungstrockner klein gehalten werden und kann die mit dem Strich beschichtete Glasvliesstoffbahn im freien Zug, also kontaktfrei, durch den Infrarotstrahlungstrockner geführt werden. Dies ist für die Qualität des Strichauftrags von Vorteil, welcher vor seinem Durchtrocknen vor Kontakt geschützt werden muss. Als Auftragswerk für den Strich eignet sich besonders gut ein Vorhangauftragswerk.If the glass nonwoven web is to be refined by applying a coating, this is preferably applied to the surface of the glass nonwoven web facing the infrared radiation dryer immediately before the glass nonwoven web is dried using infrared radiation from the infrared radiation dryer. "Immediately" in this context means that no other machine units should be provided between the application unit and the infrared radiation dryer. This means that the distance between the application unit and the infrared radiation dryer can be kept short and the glass nonwoven web coated with the coating can be guided through the infrared radiation dryer in free traction, i.e. without contact. This is advantageous for the quality of the coating application, which must be protected from contact before it dries. A curtain application unit is particularly suitable as an application unit for the coating.

Nach dem Trocknen der Glasvliesstoffbahn mittels Infrarotstrahlung aus dem Infrarotstrahlungstrockner kann die Glasvliesstoffbahn ferner durch Heißluft in einem Heißlufttrockner getrocknet werden. Dies kann wirtschaftlich vorteilhaft sein, da Infrarotstrahlungstrockner gegenüber Heißlufttrocknern in der Regel höhere Betriebskosten aufweisen. Durch den Infrarotstrahlungstrockner lässt sich jedoch eine schnelle Immobilisierung des Strichs oder des Bindemittels auf der Glasvliesstoffbahn erzielen, so dass zum anschließenden Durchtrocknen dann der Heißlufttrockner, welcher in der Regel nach dem Prallströmprinzip arbeitet, verwendet werden kann, ohne das ein "Verblasen" des aufgetragenen Strichs oder Bindermittels befürchten zu müssen.After drying the glass nonwoven web using infrared radiation from the infrared radiation dryer, the glass nonwoven web can also be dried using hot air in a hot air dryer. This can be economically advantageous, as infrared radiation dryers generally have higher operating costs than hot air dryers. However, the infrared radiation dryer can quickly immobilize the coating or binder on the glass nonwoven web, so that the hot air dryer, which generally works according to the impingement flow principle, can then be used for subsequent drying without having to worry about the applied coating or binder being "blown away".

Besonders wirtschaftlich lassen sich diese beiden Trocknertypen zusammen betreiben, wenn der Infrarotstrahlungstrockner und der in Laufrichtung der Glasvliesstoffbahn nachgeschaltete Heißlufttrockner als Kombinationstrocknereinheit ausgebildet sind. Es können auch mehrere solcher Kombinationstrocknereinheiten hintereinander angeordnet sein. Dabei wird vorzugsweise heiße Luft aus dem Infrarotstrahlungstrockner abgesaugt und zumindest teilweise dem Heißlufttrockner zugeführt. Dies macht den Prozess besonders Energieeffizient. Es ist vorteilhaft, wenn zwischen dem Heißlufttrockner und dem Infrarotstrahlungstrockner ein Abstand von weniger als 50cm, vorzugsweise von weniger als 30cm, vorhanden ist. Auf diese Weise kann sichergesellt werden, dass die Temperatur der von dem Infrarotstrahlungstrockner bestrahlten Oberfläche der Glasvliesstoffbahn nicht nennenswert absinkt, ehe die Glasvliesstoffbahn in den Heißlufttrockner geführt wird.These two types of dryer can be operated together particularly economically if the infrared radiation dryer and the hot air dryer downstream in the direction of travel of the glass nonwoven web are designed as a combination dryer unit. Several such combination dryer units can also be arranged one behind the other. Hot air is preferably extracted from the infrared radiation dryer and at least partially fed to the hot air dryer. This makes the process particularly energy efficient. It is advantageous if there is a distance of less than 50 cm, preferably less than 30 cm, between the hot air dryer and the infrared radiation dryer. In this way, it can be ensured that the temperature of the surface of the glass nonwoven web irradiated by the infrared radiation dryer does not drop significantly before the glass nonwoven web is fed into the hot air dryer.

Ferner zu erwähnen ist eine Vorrichtung zur Herstellung und/oder Veredelung einer Glasvliesstoffbahn, wobei die Vorrichtung einen Infrarotstrahlungstrockner zum thermischen Trocknen der Glasvliesstoffbahn mittels Infrarotstrahlung umfasst, und sich dadurch besonders auszeichnet, dass der Infrarotstrahlungstrockner ausgelegt ist, die dem Infrarotstrahlungstrockner zugewandten Oberfläche der Glasvliesstoffbahn mit einer spezifischen Leistungsdichte von wenigstens 153 kW/m2 zu beaufschlagen, wobei die Vorrichtung so ausgelegt ist, dass die Glasvliesstoffbahn nach der Bestrahlung durch den Infrarotstrahlungstrockner eine Temperatur an ihrer dem Infrarotstrahlungstrockner zugewandten Oberfläche von wenigstens 40°C und höchstens 105°C aufweist. Vorzugsweise ist die Vorrichtung ausgelegt, das zuvor beschriebene, erfindungsgemäße Verfahren durchzuführen.Also to be mentioned is a device for producing and/or finishing a glass nonwoven web, the device comprising an infrared radiation dryer for thermally drying the glass nonwoven web by means of infrared radiation, and is particularly characterized in that the infrared radiation dryer is designed to apply a specific power density of at least 153 kW/m 2 to the surface of the glass nonwoven web facing the infrared radiation dryer, the device being designed such that the glass nonwoven web has a temperature on its surface facing the infrared radiation dryer of at least 40°C and at most 105°C after irradiation by the infrared radiation dryer. The device is preferably designed to carry out the method according to the invention described above.

Die Erfindung wird nachfolgend anhand von schematischen und nicht maßstabsgetreuen Zeichnungen weiter erläutert. Es zeigen:

Figur 1
eine erste Ausführungsform einer Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens, und
Figur 2
eine zweite Ausführungsform einer solchen Vorrichtung.
The invention is explained further below using schematic drawings that are not to scale. They show:
Figure 1
a first embodiment of a device for carrying out the method according to the invention, and
Figure 2
a second embodiment of such a device.

Figur 1 zeigt eine erste Ausführungsform einer Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens. Dabei wird eine mit einem Bindemittel oder einem Strich beschichtete Glasvliesstoffbahn G durch einen Trockner 10 geführt (von links nach rechts in Figur 1). Das Bindemittel oder der Strich können unmittelbar vor dem Trocknen der Glasvliesstoffbahn G auf eine Oberfläche selbiger aufgebracht worden sein, beispielsweise durch ein hier nicht dargestelltes Vorhangauftragswerk. Figure 1 shows a first embodiment of a device for carrying out the method according to the invention. A glass nonwoven web G coated with a binder or a coating is guided through a dryer 10 (from left to right in Figure 1 ). The binding agent or the coating may have been applied to a surface of the glass nonwoven web G immediately before drying thereof, for example by means of a curtain coating device (not shown here).

Der Trockner 10 umfasst einen in Prozessrichtung betrachtet stromaufwärts angeordneten Infrarotstrahlungstrockner 20 und einen stromabwärts angeordneten Heißlufttrockner 30. Der Abstand A zwischen dem Infrarotstrahlungstrockner 20 und dem Heißlufttrockner 30 beträgt hier weniger als 30cm. Der Infrarotstrahlungstrockner 20 kann seinerseits mehrere Module umfassen, von denen jedes Modul wiederum mehrere Reihen an einzelnen Infrarotstrahlern aufweisen kann. In dem hier dargestellten Ausführungsbeispiel umfass der Infrarotstrahlungstrockner zwei Module 21, 22, welche jeweils zwei Reihen von Infrarotstrahlern aufweisen. Zudem weist jedes der beidem Module 21, 22 auch noch eine Frischluftzufuhr und eine Gebrauchtluftabfuhr auf, wobei die Luftströme in Figur 1 mit Pfeilen gekennzeichnet sind. Der Trockner erstreckt sich dabei über die gesamte Breite (orthogonal zur Bildebene in Figur 1) der zur trocknenden Glasvliesstoffbahn (G).The dryer 10 comprises an infrared radiation dryer 20 arranged upstream in the process direction and a hot air dryer 30 arranged downstream. The distance A between the infrared radiation dryer 20 and the hot air dryer 30 is less than 30 cm. The infrared radiation dryer 20 can in turn comprise several modules, each module of which can in turn have several rows of individual infrared radiators. In the embodiment shown here, the infrared radiation dryer comprises two modules 21, 22, each of which has two rows of infrared radiators. In addition, each of the two modules 21, 22 also has a fresh air supply and a used air discharge, with the air flows in Figure 1 marked with arrows. The dryer extends over the entire width (orthogonal to the image plane in Figure 1 ) of the glass fleece web (G) to be dried.

Erfindungsgemäß wird die dem Infrarotstrahlungstrockner zugewandten Oberfläche der Glasvliesstoffbahn G durch den Infrarotstrahlungstrockner 20 mit einer spezifischen Leistungsdichte von wenigstens 153 kW/m2 beaufschlagt. Gleichzeitig wird durch geeignete Wahl der Baulänge des Infrarotstrahlungstrockners 20 und der Geschwindigkeit, mit welcher die Glasvliesstoffbahn G durch den Trockner 10 geführt wird, sichergestellt, dass die Glasvliesstoffbahn nach der Bestrahlung durch den Infrarotstrahlungstrockner 20 eine Temperatur an ihrer dem Infrarotstrahlungstrockner 20 zugewandten Oberfläche von wenigstens 40°C und höchstens 105°C aufweist. Zur Überwachung der Oberflächentemperatur kann in dem Trockner 10 ein Temperatursensor T installiert sein, der geeignet ist, kontaktlos, beispielsweise mittels Laser-Technologie, die Temperatur auf der Oberfläche der Glasvliesstoffbahn am Ende des Infrarotstrahlungstrockners 20 zu bestimmen.According to the invention, the surface of the glass nonwoven web G facing the infrared radiation dryer is subjected to a specific power density of at least 153 kW/m 2 by the infrared radiation dryer 20. At the same time, by suitable selection of the length of the infrared radiation dryer 20 and the speed at which the glass nonwoven web G is guided through the dryer 10, it is ensured that the glass nonwoven web has a temperature on its surface facing the infrared radiation dryer 20 of at least 40°C and at most 105°C after irradiation by the infrared radiation dryer 20. To monitor the surface temperature, a temperature sensor T can be installed in the dryer 10, which is suitable for determining the temperature on the surface of the glass nonwoven web at the end of the infrared radiation dryer 20 without contact, for example by means of laser technology.

Der Heißlufttrockner 30 ist ausgebildet, heiße Luft, die er aus einer hier nicht dargestellten Quelle bezieht, auf die zu trocknende Oberfläche der Glasvliesstoffbahn G zu blasen. Dabei erfolgt die Trocknung primär durch das Prallströmprinzip.The hot air dryer 30 is designed to blow hot air, which it obtains from a source not shown here, onto the surface of the glass nonwoven web G to be dried. Drying is carried out primarily by the impingement flow principle.

Das in Figur 2 dargestellte zweite Ausführungsbeispiel einer solchen Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens unterscheidet sich nur geringfügig von dem in Figur 1 dargestellten ersten Ausführungsbeispiel. Daher wird im Folgenden nur auf die Unterschiede eingegangen und im Übrigen auf die obige Beschreibung verwiesen. Der Hauptunterschied liegt darin, dass der Trockner im zweiten Ausführungsbeispiel als Kombinationstrocknereinheit 12 ausgebildet ist. Dabei wird warme Luft aus der Gebrauchtluftabfuhr der beiden Module 21, 22 des Infrarotstrahlungstrockners 20 zumindest teilweise dem Heißlufttrockner 30 zugeführt. Dies bedeutet nicht, dass der Heißlufttrockner 30 mit keiner weiteren Quelle für heiße Luft mehr verbunden ist, jedoch hilft die Führung von heißer Luft von dem Infrarotstrahlungstrockner 20 zu dem Heißlufttrockner 30, den Energiebedarf insgesamt zu senken. Der Infrarotstrahlungstrockner 20 und der Heißlufttrockner 30 der Kombinationstrocknereinheit 12 können zudem eine gemeinsame Einhausung aufweisen.This in Figure 2 The second embodiment of such a device for carrying out the method according to the invention differs only slightly from the one shown in Figure 1 illustrated first embodiment. Therefore, only the differences will be discussed below and reference is made to the above description. The main difference is that the dryer in the second embodiment is designed as a combination dryer unit 12. Warm air from the used air discharge of the two modules 21, 22 of the infrared radiation dryer 20 is at least partially fed to the hot air dryer 30. This does not mean that the hot air dryer 30 is no longer connected to any other source of hot air, but the routing of hot air from the infrared radiation dryer 20 to the hot air dryer 30 helps to reduce the overall energy requirement. The infrared radiation dryer 20 and the hot air dryer 30 of the combination dryer unit 12 can also have a common housing.

Bezuqszeichenliste:List of reference symbols:

1010
Trocknerdryer
1212
KombinationstrocknereinheitCombination dryer unit
2020
InfrarotstrahlungstrocknerInfrared radiation dryer
2121
Modulmodule
2222
Modulmodule
3030
HeißlufttrocknerHot air dryer
GG
GlasvliesstoffbahnGlass fleece web
TT
TemperatursensorTemperature sensor

Claims (7)

  1. Method for the production and/or processing of a nonwoven glass fabric web (G), wherein the method comprises the following step: thermal drying of the nonwoven glass fabric web (G) by means of infrared radiation from an infrared radiation dryer (20),
    characterized in that a specific power density of at least 153 kW/m2 is applied by the infrared radiation dryer (20) to the surface of the nonwoven glass fabric web (G) facing toward the infrared radiation dryer (20), and in that after the irradiation by the infrared radiation dryer (20), the nonwoven glass fabric web (G) has a temperature of at least 40°C and at most 105°C on its surface facing toward the infrared radiation dryer (20).
  2. Method according to Claim 1,
    characterized in that immediately before the drying of the nonwoven glass fabric web (G) by means of infrared radiation from the infrared radiation dryer (20), a coat is applied onto the surface of the nonwoven glass fabric web (G) facing toward the infrared radiation dryer (20).
  3. Method according to Claim 1 or 2,
    characterized in that after the drying of the nonwoven glass fabric web (G) by means of infrared radiation from the infrared radiation dryer (20), the nonwoven glass fabric web (G) is furthermore dried by hot air in a hot air dryer (30).
  4. Method according to Claim 3,
    characterized in that the infrared radiation dryer (20) and the hot air dryer (30), which follows in the direction of movement of the nonwoven glass fabric web (G), are configured as a combination dryer unit (12) .
  5. Method according to Claim 4,
    characterized in that a plurality of combination dryer units (12) are arranged successively in the direction of movement of the nonwoven glass fabric web (G).
  6. Method according to one of Claims 3-5,
    characterized in that hot air from the infrared radiation dryer (20) is aspirated and at least partially delivered to the hot air dryer (30).
  7. Method according to one of Claims 3-6,
    characterized in that there is a distance (A) of less than 50 cm, preferably of less than 30 cm, between the hot air dryer (30) and the infrared radiation dryer (20).
EP20174303.6A 2019-06-27 2020-05-13 Method for producing and/or finishing a glass mat sheet Active EP3757268B1 (en)

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DE102019117281.0A DE102019117281B3 (en) 2019-06-27 2019-06-27 Process for producing and / or finishing a glass nonwoven web

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EP3757268B1 true EP3757268B1 (en) 2024-07-10

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DE102019117281B3 (en) 2020-06-18
US20200407909A1 (en) 2020-12-31

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