EP2064036B1 - Herstellungsverfahren für ein agglomeriertes korkprodukt und auf diese weise hergestelltes produkt - Google Patents

Herstellungsverfahren für ein agglomeriertes korkprodukt und auf diese weise hergestelltes produkt Download PDF

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Publication number
EP2064036B1
EP2064036B1 EP07848228A EP07848228A EP2064036B1 EP 2064036 B1 EP2064036 B1 EP 2064036B1 EP 07848228 A EP07848228 A EP 07848228A EP 07848228 A EP07848228 A EP 07848228A EP 2064036 B1 EP2064036 B1 EP 2064036B1
Authority
EP
European Patent Office
Prior art keywords
cork
starch
binder
weight
aggregates
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.)
Not-in-force
Application number
EP07848228A
Other languages
English (en)
French (fr)
Other versions
EP2064036A1 (de
Inventor
Eric Bosly
Audrey Bourgeois
Philippe Willems
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.)
Cosucra-Groupe Warcoing
COSUCRA GROUPE WARCOING SA
Original Assignee
Cosucra-Groupe Warcoing
COSUCRA GROUPE WARCOING SA
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 Cosucra-Groupe Warcoing, COSUCRA GROUPE WARCOING SA filed Critical Cosucra-Groupe Warcoing
Publication of EP2064036A1 publication Critical patent/EP2064036A1/de
Application granted granted Critical
Publication of EP2064036B1 publication Critical patent/EP2064036B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/02—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from particles

Definitions

  • the invention relates to a process for producing a cork product and more specifically to agglomerated natural cork.
  • the invention relates more particularly to the use of such a method for producing a plug.
  • Sintered cork stoppers such as champagne corks are called "technical" stoppers. Their manufacture is made from casing residues resulting from the manufacture of natural cork stoppers.
  • the residues are transformed into cork aggregates which are then agglomerated to form the technical stopper.
  • the agglomeration of aggregates is achieved by impregnating the aggregates with an adhesive.
  • the product thus obtained then undergoes a mechanical finishing step for shaping the cap to the desired dimensions.
  • the document FR-A-2,799,183 discloses a process according to the preamble of claim 1 and an article according to the preamble of claim 13.
  • the adhesives used to impregnate cork aggregates are generally based on isocyanate, for example polyurethane glues, and are used in aqueous form.
  • some components of the glue can migrate into the liquid with which the cap is in contact, for example with wine or alcohol, which can denature the taste of the liquid, but also carry health risks.
  • Aqueous adhesives may furthermore have storage stability problems such as, for example, microbial contamination, which requires the addition of biocide to the adhesive.
  • the aqueous adhesives also generate effluents, which will therefore be treated later.
  • solubilization of the starch requires the addition of a significant amount of water, which causes problems of vapor overpressure and the risk of explosion during the subsequent agglomeration step which includes a phase compression and a heating phase with a very significant rise in the temperature of the cork.
  • the aim of the invention is to overcome these drawbacks by proposing a method of producing an agglomerated product made of natural cork, such as a stopper, according to claim 1, in which a binder of natural origin, possibly derived from the binder, is used.
  • organic farming which does not present a health risk and is used in powder form by using only a very small amount of water.
  • the invention also relates to an agglomerated natural cork article according to claim 13.
  • the method according to the invention can be used to produce technical plugs, but also other agglomerated cork products, such as floor coverings, decorative products, products for textile and clothing, household products or industrial, products intended for building and / or civil engineering (acoustic and thermal insulation, anti-vibration elements, ...), etc.
  • Starch is a natural binder that can be ingested without dietary risk. Thus, the migration of starch into a liquid does not make it unfit for consumption.
  • the process according to the invention is therefore particularly well suited to the manufacture of cork stoppers, for the packaging of beverages and, in particular, wines, spirits and champagnes.
  • starch-based binder is not toxic to the personnel involved in the production of the cork product. This staff can therefore handle it safely.
  • the cork granulates can be obtained in the traditional way, that is to say by trituration of the casings of the plugs of natural plugs to obtain the desired particle size.
  • the binder is mixed with a powder crosslinking agent, suitable for food contact.
  • This agent has an insolubilizing function.
  • this mixture comprises from 70% to 100% by weight of starch and comprises, in addition, substantially from 0% to 30% by weight of crosslinking agent.
  • the mixture comprises substantially from 80% to 95% by weight of starch and substantially from 5% to 20% by weight of the crosslinking agent.
  • the starch is in the form of a cold soluble powder and optionally chemically modified.
  • the starch binder is produced as a cold-soluble powder. Thus, it avoids the problems related to aqueous adhesives of the prior art: simplicity of storage without risk of microbial migration, short drying time, removal of the subsequent risk of steam explosion, etc ...
  • the cold solubilization is obtained, preferably, by pre-gelatinization by means of an extruder or a drying drum according to techniques known elsewhere.
  • the pregelatinized starch is starch which has been mechanically treated in the presence of water, using a thermal process or not, to break all the part of the starch grains and which has then been dried out. It normally contains no added substance, but can be modified to make it compressible and improve its fluidity characteristics.
  • the powder binder After wetting, the powder binder forms a gel capable of adhering because of its high viscosity.
  • the Applicant has found that the quality of the stoppers was improved when the starch used to make the binder is starch extracted from vegetables such as peas.
  • the pea starch has a naturally high content of amylose, which improves the flexibility and water resistance of the starch.
  • pea starch has a higher viscosity than other starches and a better stability in gel form.
  • starches from corn, wheat, waxy maize, potato, tapioca, rice, etc.
  • the method may provide a step of moistening the cork granules before impregnation with the binder.
  • the proportion of starch relative to cork is between 10% and 25% by weight.
  • the agglomeration step of the process for manufacturing agglomerated cork according to the invention comprises a compression phase and a temperature increase phase.
  • Agglomeration of cork granulates can be carried out by direct molding or by extrusion.
  • extrusion is provided at a temperature of between 120 ° C and 130 ° C for 3 to 10 minutes.
  • the agglomeration is between 110 ° C and 120 ° C for about 1 hour.
  • the pressure reached is of the order of 2 MPa (20 bar).
  • the method implies that the amount of added water is less than 25% of the weight of the cork to prevent the risk of steam explosion, especially during the agglomeration phase and to allow rapid drying in the heart of the cork chipboard.
  • the crosslinking agent is in the form of powder previously mixed with the starch.
  • the crosslinking agent is in liquid form and is mixed with a proportion or all of water and this crosslinking / water mixture is added during the wetting of the cork granules before or after their coating. and / or their impregnation with the binder.
  • the crosslinking agent employed is officially authorized for food contact.
  • the crosslinking agent used is Urecoll SMV, the composition of which complies with the recommendations of the European health authorities concerning food packaging papers which also stipulate that "cold water extract” must not contain more than 1.0 mg of formaldehyde per 100 cm 2 of paper.
  • the applicant has carried out several tests in two series to demonstrate that the cold-soluble pea starch is particularly suitable for use as a binder, in particular for cork.
  • cork blocks were formed by mixing cork aggregates, pre-gelatinized (cold-soluble) starch, water and a crosslinking agent, followed by agglomeration with the aid of a heating press.
  • the cork blocks should have a density between 250 and 300 g / dm 3 and withstand the water immersion test at 100 ° C for 1 hour.
  • the crosslinking agent used in all the tests is a liquid crosslinking agent (70% DM) and the quantity indicated in the tables is therefore each time the percentage of the liquid quantity (by weight) relative to the amount of starch (by weight ).
  • the densities obtained are close to the desired range. It is likely that this density can be further increased with more suitable equipment.
  • a test immersion test was performed. This test consists of recording the time after which the cork block is totally dislocated when it is immersed in water at 100 ° C. The caps must be perfectly formed after one hour of immersion for the result to be considered positive.
  • the test was conducted on the tests mentioned above one day after their manufacture and eight days after their manufacture.
  • the cork blocks meet the immersion test criteria and the results are significantly better after one week of storage of the blocks.
  • the building market requires densities of some 500 g / dm 3 for some of its products.
  • the Bât EmU-5 test was carried out with cork of smaller grain size also called "cork dust" commonly used in some building products.
  • the low density of cork allows better compression and, by the same token, obtaining a higher density of the finished product.
  • the composition of the test is reported in the following table: testing Cork aggregates (g) Water (% / cork) Crosslinking agent (% / starch) Type (% / starch) Starch (% / cork) (g) Extruded Pregelatinized Pea Starch EmU-5 building 102.5 20 20 20 Urecoll SMV 15
  • the different tests are characterized by their density expressed in g / dm 3 , by their flexibility measured with TA-XT2i texture analyze and by their resistance to the boiling water immersion test.
  • the densities of the EmU-6, EmU-7, EmU-8 and EmU-9 tests are within the desired range of values (250-300 g / dm 3 ).
  • the density of the EmU-5 Bât test is close to the expected 500 g / dm 3 while remaining lower. The use of a more adapted material makes it possible to reach them.
  • the determination of the texture of the cork articles is carried out using the texture analyzer TA-XT2i Texture Analyze.
  • the cork article to be analyzed is previously cut in the form of a rectangle with the following dimensions: 2.5 cm ⁇ 2.5 cm ⁇ 5 cm.
  • the measurement is made according to the height of the sample and corresponds to the maximum force applied to compress it by 3 mm.
  • the starch content of the blocks obtained in the examples is between 9% and 20% by weight.
  • the 4 tests are resistant to immersion in boiling water.
  • the EmU-6 and EmU-7 tests which have higher starch contents, give better results in that the samples absorb less water and do not deform.
  • corks meeting the standards required for applications of the technical cap type can be manufactured by replacing the glue obtained from synthetic products with a natural binder based on starch without alteration or degradation of the mechanical properties .

Claims (14)

  1. Verfahren zur Fertigung eines Produktes aus Presskork anhand von natürlichen Korkgranulaten, dadurch gekennzeichnet, dass es die folgenden Schritte umfasst :
    a) Zubereitung eines Bindemittels auf Basis von kalt löslichem Stärkepulver ;
    b) Umhüllung und/oder Imprägnieren der Korkgranulate mit Hilfe des Bindemittels ;
    c) Agglomerieren der imprägnierten Granulate;
    d) mechanische Endbearbeitung des erhaltenen Produkts, um ihm die gewünschten Dimensionen und Form zu geben und,
    dadurch dass die Wassermenge, die während der Schritte der Umhüllung und/oder des Imprägnierens und/oder des Agglomerierens eingeführt wird, nicht mehr als 25% des Gewichts vom Kork beträgt.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass das Bindemittel mit einem Vernetzerpulver vermischt wird, das für den Lebensmittelkontakt geeignet ist.
  3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass die Mischung 70 bis 100 Gewichtsprozente Stärke und 0 bis 30 Gewichtsprozente Vernetzer enthält.
  4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass die Mischung im Wesentlichen 80 bis 95 Gewichtsprozente Stärke und im Wesentlichen 5 bis 20 Gewichtsprozente Vernetzer umfasst.
  5. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Vernetzer in flüssiger Form ist und mit dem Wasser vermischt wird, bevor er den Granulaten hinzugefügt wird.
  6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Korkgranulate vor ihrer Umhüllung und/oder ihrer Imprägnierung durch das Bindemittel befeuchtet werden.
  7. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Bindemittel auf Basis von chemisch modifizierter Stärke ist.
  8. Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die Stärke, die für die Realisierung des Bindemittels verwendet wird, Stärke auf Basis von Erbsen ist.
  9. Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass das Agglomerieren der Korkgranulate durch direktes Formpressen oder durch Strangpressen realisiert wird.
  10. Verfahren nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass der Anteil der Stärke im Verhältnis zum Kork zwischen 10 und 25 Gewichtsprozenten liegt.
  11. Verfahren nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass der Schritt der mechanischen Endbearbeitung ein Schritt zur Realisierung eines technischen Pfropfens aus Kork ist.
  12. Verfahren nach Anspruch 11, dadurch gekennzeichnet, dass er die zusätzlichen Schritte des Klebens einer Korkscheibe auf einem oder auf zwei Enden des Pfropfens umfasst, wobei das Kleben mit Hilfe des Bindemittels auf Basis von Stärke erfolgt, mit dem die Oberfläche der zu klebenden Scheibe bestrichen wird.
  13. Artikel aus natürlichem Presskork, der mit dem Verfahren nach einem der Ansprüche 1 bis 12 realisiert wird, dadurch gekennzeichnet, dass er 9 bis 20 Gewichtsprozente Stärke umfasst.
  14. Artikel aus natürlichem Presskork nach Anspruch 13, dadurch gekennzeichnet, dass er eine Dichte zwischen 250 und 500 g/dm3 aufweist.
EP07848228A 2006-09-13 2007-09-13 Herstellungsverfahren für ein agglomeriertes korkprodukt und auf diese weise hergestelltes produkt Not-in-force EP2064036B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0608006A FR2905626B1 (fr) 2006-09-13 2006-09-13 Procede de realisation d'un produit en liege agglomere.
PCT/FR2007/001488 WO2008031952A1 (fr) 2006-09-13 2007-09-13 Procede de realisation d'un produit en liege agglomere et produit ainsi obtenu

Publications (2)

Publication Number Publication Date
EP2064036A1 EP2064036A1 (de) 2009-06-03
EP2064036B1 true EP2064036B1 (de) 2011-12-21

Family

ID=37845352

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07848228A Not-in-force EP2064036B1 (de) 2006-09-13 2007-09-13 Herstellungsverfahren für ein agglomeriertes korkprodukt und auf diese weise hergestelltes produkt

Country Status (6)

Country Link
EP (1) EP2064036B1 (de)
AT (1) ATE537949T1 (de)
ES (1) ES2383188T3 (de)
FR (1) FR2905626B1 (de)
PT (1) PT2064036E (de)
WO (1) WO2008031952A1 (de)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE467902A (de) * 1944-08-18
JPH02117319A (ja) * 1988-10-27 1990-05-01 Nippon Sanmou Senshoku Kk 培地用素材
DE3935092C1 (en) * 1989-10-23 1991-06-06 Philipp, Stephanie, 6467 Hasselroth, De Method of mfg. insulating boards - uses foamed starch mixed with natural fibres, e.g. wood or hemp
FR2799183B1 (fr) * 1999-10-05 2001-12-14 Bouchages Delage Bouchon en liege agglomere et son procede d'obtention
IT1308301B1 (it) * 1999-10-11 2001-12-10 O M L O S R L Officina Meccani Macchina per la composizione di tappi in sughero
EP1352939A1 (de) * 2002-04-12 2003-10-15 Remy Industries N.V. Klebstoff-Paste Zusammensetzungen auf Basis von Stärke

Also Published As

Publication number Publication date
EP2064036A1 (de) 2009-06-03
FR2905626A1 (fr) 2008-03-14
ATE537949T1 (de) 2012-01-15
PT2064036E (pt) 2012-04-03
ES2383188T3 (es) 2012-06-19
FR2905626B1 (fr) 2012-08-31
WO2008031952A1 (fr) 2008-03-20

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