EP2310780A2 - Procédé et dispositif de séchage et de précondensation de produits imprégnés obtenus à partir d'un matériau en bande de type feuille imbibé de résine synthétique; produit imprégné exempt de résine de mélamine - Google Patents

Procédé et dispositif de séchage et de précondensation de produits imprégnés obtenus à partir d'un matériau en bande de type feuille imbibé de résine synthétique; produit imprégné exempt de résine de mélamine

Info

Publication number
EP2310780A2
EP2310780A2 EP09780326A EP09780326A EP2310780A2 EP 2310780 A2 EP2310780 A2 EP 2310780A2 EP 09780326 A EP09780326 A EP 09780326A EP 09780326 A EP09780326 A EP 09780326A EP 2310780 A2 EP2310780 A2 EP 2310780A2
Authority
EP
European Patent Office
Prior art keywords
resin
impregnate
drying
web material
impregnation
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.)
Withdrawn
Application number
EP09780326A
Other languages
German (de)
English (en)
Inventor
Paul Leitner
Alois Gruber
Johann Lienbacher
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kaindl Decor GmbH
Original Assignee
Kaindl Decor GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kaindl Decor GmbH filed Critical Kaindl Decor GmbH
Publication of EP2310780A2 publication Critical patent/EP2310780A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/24—Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs
    • C08J5/245—Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs using natural fibres
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L61/00—Compositions of condensation polymers of aldehydes or ketones; Compositions of derivatives of such polymers
    • C08L61/20—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
    • C08L61/22—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with acyclic or carbocyclic compounds
    • C08L61/24—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with acyclic or carbocyclic compounds with urea or thiourea
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L61/00—Compositions of condensation polymers of aldehydes or ketones; Compositions of derivatives of such polymers
    • C08L61/20—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
    • C08L61/26—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds
    • C08L61/28—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds with melamine
    • 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
    • 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
    • F26B3/32—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action
    • F26B3/34—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects
    • F26B3/343—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects in combination with convection
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2361/00—Characterised by the use of condensation polymers of aldehydes or ketones; Derivatives of such polymers
    • C08J2361/20—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
    • C08J2361/22—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with acyclic or carbocyclic compounds
    • C08J2361/24—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with acyclic or carbocyclic compounds with urea or thiourea
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2361/00—Characterised by the use of condensation polymers of aldehydes or ketones; Derivatives of such polymers
    • C08J2361/20—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
    • C08J2361/26—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds
    • C08J2361/28—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds with melamine

Definitions

  • Web material are formed; Melamine resin-free impregnate
  • the invention relates to a method and an apparatus for drying and precondensing impregnates, which are formed from resin-impregnated film-like sheet material.
  • impregnates are used individually or in the form of a laminate formed from such impregnates, for example for the coating of base materials formed from wood material, such as in the manufacture of panels for covering surfaces, such as floors.
  • a sheet material is not only in the prior art, but also in connection with the present invention, in particular a formed of natural fibers and / or synthetic fibers composite into consideration, for example, a scrim, a mat, a fabric or the like.
  • film-like expresses the fact that the web material is still flexible even after drying and precondensation, in particular because of its small thickness, which may be, for example, of the order of 0.1 mm
  • the web material may be paper whose basis weight in the unimpregnated state may be between about 25 g / m 2 and about 300 g / m 2.
  • the paper layer of an impregnate intended to form a visible surface of the final product may be printed with a desired decoration
  • impregnating resins usually aminoplast and phenoplast resins are used.
  • the resin or “the impregnating resin” in the singular, this resin may also be a mixture of different synthetic resins.
  • the synthetic resin is mixed with a solvent, for example water, whose function is to lower the viscosity of the synthetic resin. If the web material is impregnated or impregnated with synthetic resin, then the solvent must be removed again from the impregnate thus formed before further processing, ie the impregnate must be dried.
  • this drying of the impregnate simultaneously involves a condensation of the synthetic resin, ie an increase in the molecular weight of the resin.
  • This pre-cure is desirable because it reduces the energy and time required to cure the resin during further processing, particularly when coating a wood-based body with such an impregnate.
  • the impregnate has been dried to a predetermined "residual moisture"
  • the impregnate is actually drier on the surfaces and more moisturally on the surfaces than the value of the "residual moisture” parameter averaged over the entire cross-section of the impregnate.
  • the degree of drying which the impregnate has on its surface fundamentally permits the stacking of such impregnates until they are further processed during the coating of base bodies, the impregnation may nevertheless stick during the storage because the excess moisture from the inside of the Impregnate diffused to the surfaces and there makes the resin again sticky. This effect limits the maximum shelf life of impregnates.
  • This dust which consists of over-hardened resin, loses its bond to the web material in the drying air. This leads to contamination of the system and to a reduced resin yield.
  • the superficial heat causes the resin layer to be pre-cured to such an extent that the viscosity of the resin is so high that the formation of a decorative surface is disturbed and open-porous surfaces form, for example, due to insufficient resin flow during further processing.
  • the transparency of the resin can be impaired because gel particles form, which are no longer with the connect remaining resin matrix and thus remain as optical defects in the resin composite.
  • WO 2007/065222 A1 attempts to avoid the disadvantages described by radiation drying by means of near-infrared radiation (NIR radiation). In practice, however, it has been found that this method has considerable disadvantages compared with conventional hot-air drying.
  • NIR radiation near-infrared radiation
  • NIR drying process A major disadvantage of the NIR drying process is the strong dependency of the degree of drying on the color of the impregnate. This leads to unacceptable results especially when drying multi-colored decorative papers.
  • Another disadvantage is the need to equip the drying channel with a variety of reflectors, which should improve the energy yield of the NIR radiation by multiple use. These reflectors are constantly contaminated by condensation and deposit formation, so that an efficient process can not be sustained in the long run.
  • NIR drying - especially in industrial continuous operation - can not be operated economically.
  • the part of the resin which is crucial for the quality of the surface in the further processing still has a sufficiently low viscosity to without pore formation, inclusion of gel particles or the like, the quality of Surface impairing effects to be fully cured as a closed surface.
  • the impregnates used according to the invention have the property of being tacky, especially when the synthetic resin with which the web material has been soaked is still moist. Residues adhering to guide elements, in particular synthetic resin and possibly fiber material connected thereto, - Q - can lead in the long run to disturbances on the product surface or even to the tearing of the web material. In order to be able to prevent such contamination of the treatment device, it is therefore proposed to guide the web material without contact through the treatment device, preferably by means of at least one air cushion, which can be produced for example by means of nozzle boxes.
  • the ejected from these nozzle boxes air can also be used to dissipate emerging from the web material moisture. For this purpose, therefore, no additional fan needs to be provided, but can be removed only by the ejected from the nozzle boxes air. This simplifies and reduces the overall structure of the treatment device.
  • the air expelled from the nozzle boxes heated, so they can absorb more moisture per unit volume and carry away. Against the background of the above explanations, however, it is understood that the temperature of the air cushion may not be so high that overdrying and overcondensation of the surfaces of the web material occur.
  • the air ejected from the nozzle boxes is determined exclusively for the removal of the moisture emitted by the web material and is not used for heating the impregnate, it is possible to work with considerably smaller amounts of air in the method according to the invention. This results in correspondingly lower flow velocities at the surfaces of the web material. Therefore, there is no risk in the method according to the invention that aerosols are formed on the surfaces of the web material and carried away from the surface. This also contributes to the reduction of contamination of the treatment device.
  • the method according to the invention condense the moisture removed from the surface of the web material in a subsequent step and thus to recover it.
  • the condensate contains volatile low-molecular fractions of the impregnating resin, which can be reintroduced into the production process.
  • the material and energy efficiency of the method according to the invention is further increased.
  • the load of the exhaust gas with organic substances decreases, whereby the exhaust gas purification is relieved or can be made smaller.
  • the treatment device comprises a plurality of microwave radiation units.
  • the frequency of the microwave radiation emitted by these emitting units is, for example, between 900 MHz and 18 GHz, preferably 2.45 GHz.
  • This plurality of emission units can be used to achieve various beneficial effects. For example, even more uniform drying and precondensation of the impregnate can be achieved if the microwave radiation units are arranged on both sides of the web material.
  • drying and Vorkondensationsgrad of the impregnate increasing in the conveying direction of the impregnation by the treatment device can be taken into account that the intensity of the microwave radiation emitted by the Mikrowellenabstrahlöen decreases in the conveying direction of the web material by the treatment device or varies in other suitable manner.
  • drying is not only more uniform but also faster by the process according to the invention.
  • the degree of precondensation of the resin after completion of the drying is lower than in the conventional drying methods.
  • the uniform drying makes it possible to produce impregnates with a particularly low degree of condensation, without these impregnates having a tendency to adhere. Therefore, less solvent needs to be added to the synthetic resin prior to impregnation of the web material to ensure a sufficiently high degree of condensation upon completion of drying. It can therefore be used according to the invention with viscous resins, as was possible in the prior art. This is particularly advantageous because of the saving of that energy which conventionally had to be expended in order to withdraw the additionally supplied moisture from the impregnate.
  • the viscosity of the resin may be, for example, between about 20 mPas and about 700 mPas, preferably between about 50 mPas and about 300 mPas (each measured with a Brookfield viscometer at a measurement temperature of 25 0 C).
  • this effect can also be used to produce an impregnate using a synthetic resin that contains no melamine resin, but for example, only urea resins. This is advantageous because of the high cost associated with the use of melamine resins.
  • no impregnate could be produced based solely on urea resins because of the unavoidable high degree of condensation, which possessed sufficient fluidity to provide adequate subsequent processing in a coating press with a base body
  • the invention therefore relates to a melamine resin-free impregnate.
  • the resins which can be used are, in particular, urea-formaldehyde resin, melamine-formaldehyde resin, melamine-urea-formaldehyde resin (MUF), melamine-urea-phenol-formaldehyde resin (MUPF), Phenol-formaldehyde resin (PF), tannin resins, resorcinol-formaldehyde resins, silicone resins.
  • FIG. 1 shows a schematic representation of a treatment device according to the invention, with the aid of which the method according to the invention can be carried out.
  • a treatment device is designated generally by 10. It comprises a housing 12 with an inlet 12a, through which an impregnate 14 enters the housing 12, and an outlet 12b, through which the impregnate 14 exits the housing 12 again. Both the input 12a and the output 12b are formed by a nip 12a1 and 12b1, respectively. a gap that forms the roles of a pair of rollers 16 and a pair of rollers 18 between them. The height of this gap 12a1 or 12b1 is dimensioned slightly larger than the thickness of the impregnate 14 and is for example about 0.1 mm.
  • the impregnate 14 between the input 12 a and the output 12 b is guided by an air cushion 20 without contact.
  • This air cushion 20 is generated by nozzle boxes 22, which are supplied via a supply line 24 (in Figure 1, only the supply line 24 of the leftmost nozzle box 22 is shown) air from a (not shown) blower.
  • nozzle boxes 22 are supplied via a supply line 24 (in Figure 1, only the supply line 24 of the leftmost nozzle box 22 is shown) air from a (not shown) blower.
  • exhaust boxes 26 the air via exhaust air lines 28 (in Figure 1, only the exhaust duct 28 of the leftmost air box 26 is shown) again discharged from the interior 12c of the housing 12.
  • a plurality of microwave antennas 30 are arranged, which irradiate the impregnate 14 with microwaves.
  • the microwave radiation is absorbed substantially uniformly by the moisture contained in the impregnate 14 in the entire volume of the impregnate 14.
  • the moisture and, consequently, also the impregnate 14, including the synthetic resin with which the impregnate 14 is impregnated are heated.
  • the moisture evaporates and a moisture gradient develops. Due to this moisture gradient, moisture also diffuses from the interior of the impregnate 14 to the surfaces 14a and evaporates there. It is essential, however, that the temperature over the entire thickness of the impregnate 14 is substantially constant, since this causes a uniform precondensation of the resin in the impregnate 14.
  • the microwave antennas 30 are arranged on both sides of the impregnate 14, i. In the illustration of Figure 1 both above and below the impregnation 14. Further, the energy supplied to the microwave antennas 30 by a control unit 32 for each individual microwave antenna 30 separately determined and via a supply line 34 (in Figure 1, only the supply line 34 for the shown leftmost antenna 30) are supplied. This makes it possible to define a desired radiation intensity profile in the interior 12c of the housing 12 with a radiation intensity varying in the conveying direction F of the impregnate 14, for example a profile with a radiation intensity decreasing from the entrance 12a to the exit 12b.
  • the nozzle boxes 22 are arranged not only below the impregnation 14, but alternately above and below.
  • the ejected from the nozzle boxes 22 air is not only used for non-contact carrying and guiding the impregnate 14, but also for discharging the Moisture which evaporates from both surfaces 14 a of the impregnate 14.
  • the moisture-laden air is collected by the exhaust boxes 26 and supplied via the exhaust ducts 28 of a condensing device 36, which condenses the moisture and a collecting tank 38, while it passes the dehumidified exhaust air to an exhaust aftertreatment system 40.
  • the condensate collected in the collecting container 38 can be returned to the production process.

Abstract

L'invention concerne un procédé et un dispositif (10) de séchage et de précondensation de produits imprégnés (14) obtenus à partir d'un matériau en bande de type feuille imbibé de résine synthétique, procédé selon lequel le produit imprégné (14) est exposé à des micro-ondes. L'invention permet ainsi d'obtenir des produits imprégnés (14) appropriés pour être pressés avec un corps de base constitué d'un matériau dérivé du bois, bien que la résine d'imprégnation soit exempte de résine de mélamine.
EP09780326A 2008-07-08 2009-07-08 Procédé et dispositif de séchage et de précondensation de produits imprégnés obtenus à partir d'un matériau en bande de type feuille imbibé de résine synthétique; produit imprégné exempt de résine de mélamine Withdrawn EP2310780A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008032053A DE102008032053A1 (de) 2008-07-08 2008-07-08 Verfahren und Vorrichtung zum Trocknen und Vorkondensieren von Imprägnaten, welche aus mit Kunstharz getränktem, folienartigem Bahnmaterial gebildet sind; Melaminharz-freies Imprägnat
PCT/EP2009/058679 WO2010003982A2 (fr) 2008-07-08 2009-07-08 Procédé et dispositif de séchage et de précondensation de produits imprégnés obtenus à partir d'un matériau en bande de type feuille imbibé de résine synthétique; produit imprégné exempt de résine de mélamine

Publications (1)

Publication Number Publication Date
EP2310780A2 true EP2310780A2 (fr) 2011-04-20

Family

ID=41412612

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09780326A Withdrawn EP2310780A2 (fr) 2008-07-08 2009-07-08 Procédé et dispositif de séchage et de précondensation de produits imprégnés obtenus à partir d'un matériau en bande de type feuille imbibé de résine synthétique; produit imprégné exempt de résine de mélamine

Country Status (7)

Country Link
US (1) US20110192048A1 (fr)
EP (1) EP2310780A2 (fr)
CN (1) CN102138049A (fr)
CA (1) CA2733543A1 (fr)
DE (1) DE102008032053A1 (fr)
RU (1) RU2485422C2 (fr)
WO (1) WO2010003982A2 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008050704A1 (de) * 2008-10-07 2010-04-08 Kaindl Decor Gmbh Vorrichtung zum Imprägnieren von bahnförmigen Materialien mit wärmehärtbarem Imprägnierharz
DE102010007692A1 (de) * 2010-02-09 2011-08-11 Beuth Hochschule für Technik Berlin, 13353 Verfahren und Anordnung zum Verändern einer Kunststofffolie
CN103292583B (zh) * 2013-06-27 2015-12-02 机械科学研究总院先进制造技术研究中心 毛条微波烘干机及毛条微波烘干方法

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Also Published As

Publication number Publication date
WO2010003982A2 (fr) 2010-01-14
RU2485422C2 (ru) 2013-06-20
US20110192048A1 (en) 2011-08-11
CA2733543A1 (fr) 2010-01-14
RU2011104193A (ru) 2012-08-20
CN102138049A (zh) 2011-07-27
WO2010003982A3 (fr) 2010-11-18
DE102008032053A8 (de) 2010-04-29
DE102008032053A1 (de) 2010-01-14

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