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EP1530608A1 - Stopper made of foamed, thermoplastic synthetic material - Google Patents

Stopper made of foamed, thermoplastic synthetic material

Info

Publication number
EP1530608A1
EP1530608A1 EP03763498A EP03763498A EP1530608A1 EP 1530608 A1 EP1530608 A1 EP 1530608A1 EP 03763498 A EP03763498 A EP 03763498A EP 03763498 A EP03763498 A EP 03763498A EP 1530608 A1 EP1530608 A1 EP 1530608A1
Authority
EP
European Patent Office
Prior art keywords
plug
foamed
cork
laser beam
laser
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.)
Granted
Application number
EP03763498A
Other languages
German (de)
French (fr)
Other versions
EP1530608B1 (en
Inventor
Gerhard Piriwe
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.)
Tampoprint GmbH
Original Assignee
" Pl" Handels GmbH
P1 Handels 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 " Pl" Handels GmbH, P1 Handels GmbH filed Critical " Pl" Handels GmbH
Priority to SI200330323T priority Critical patent/SI1530608T1/en
Priority to AT03763498T priority patent/ATE321807T1/en
Publication of EP1530608A1 publication Critical patent/EP1530608A1/en
Application granted granted Critical
Publication of EP1530608B1 publication Critical patent/EP1530608B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D39/00—Closures arranged within necks or pouring openings or in discharge apertures, e.g. stoppers
    • B65D39/0005—Closures arranged within necks or pouring openings or in discharge apertures, e.g. stoppers made in one piece
    • B65D39/0011—Closures arranged within necks or pouring openings or in discharge apertures, e.g. stoppers made in one piece from natural or synthetic cork, e.g. for wine bottles or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/28—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using thermochromic compounds or layers containing liquid crystals, microcapsules, bleachable dyes or heat- decomposable compounds, e.g. gas- liberating
    • B41M5/282—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using thermochromic compounds or layers containing liquid crystals, microcapsules, bleachable dyes or heat- decomposable compounds, e.g. gas- liberating using thermochromic compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
    • B44C1/00—Processes, not specifically provided for elsewhere, for producing decorative surface effects
    • B44C1/22—Removing surface-material, e.g. by engraving, by etching
    • B44C1/228—Removing surface-material, e.g. by engraving, by etching by laser radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D51/00—Closures not otherwise provided for
    • B65D51/24—Closures not otherwise provided for combined or co-operating with auxiliary devices for non-closing purposes
    • B65D51/245—Closures not otherwise provided for combined or co-operating with auxiliary devices for non-closing purposes provided with decoration, information or contents indicating devices, labels

Definitions

  • the invention relates to a method for producing a plug from foamed, thermoplastic, which is provided with a cork fire.
  • the plug is heated using a laser, since the use of the branding iron usually used for cork plugs has proven to be impractical.
  • the foamed material always breaks down, so that the plugs are visually unsightly and on the other hand their sealing effect is impaired.
  • EP 0 754 562 A deals with the inscription of shaped plates, foils and the like made of polyolefins by means of laser and which discloses the mica pigments, explicitly that under the name Iriodin®, as thermally discolorable pigments.
  • the laser beam used is not focused on the surface of the plug, but is used in a defocused manner, as a result of which a larger area is hit with a lower energy density than with the focused beam.
  • the focal point lies in one plane, in the direction of the laser beam, in front of the surface of the plug.
  • This lower density makes it possible to use the laser with a lower wobble frequency than is customary in focused operation, which means that, when viewed over time, at least approximately the same energy supply is obtained at each location of the laser treatment as with the usual, focused, using the laser with a high wobble frequency, but with the difference that the sensitive cuticles of the foam bubbles of the foamed plastic, which have no known heat capacity, are not selectively overheated and melted. Nevertheless, it is ensured that the pigments, the color of which only occurs when a certain amount of energy is added or the temperature rises, are supplied with the necessary energy or reach the required temperature and reliably change color.
  • the method according to the invention was used with a plug made of polyethylene (available from Borealis) which was mixed with paint, propellant and the discolourable pigment (laser patch) (all from Gabriel Chemie) and in one Injection molding machine is injected into the mold after gradual heating to 185 ° C (fluctuation ⁇ 3 ° C).
  • the amount injected, actually the mass depends on the desired volume of the plug, and in fact on the desired length of the plug; values of 8.5 g are customary for medium-length plugs.
  • the cooling of the wall of the mold is important because at a cooling water temperature of about 12 ° C. an "outer skin" of the plug is formed, in which the density of the plug is 5 to 10 times as high as inside.
  • outer skin This formation of an outer region which differs in its properties from the properties in the core of the plug, hereinafter referred to as "outer skin", is important both for the sealing properties of the plug and for its visual appearance, but this is already known from the prior art and is based on the specialist dominated the field of injection molding of foamed plastics, in particular foamed polyethylene.
  • the cooling time of the graft depends on the type and amount of the propellant gas used. It is essential that the product is no longer rubbed after it has been ejected from the mold, as this would impair the dimensions and the quality of the outer skin.
  • a plug produced in this way is now lasered with a lamp-pumped 30 watt YAG laser with a 254 mm lens that focuses the laser beam at an object distance of 410 mm.
  • the speed is set to 700 to 900 mm / sec. This speed is the superposition of the wobble movement and the forward movement.
  • an endless rod made of polyethylene was surrounded by a polymer film (in the experiment polyethylene, but polyurethane is also possible, food suitability or adaptation to the area of use of the graft is necessary), with the pigment iriodin only in this film area was included along the mantle.
  • the energy of the laser was reduced to 15 watts and the wobble frequency to 280 Hertz.
  • the invention is not restricted to the examples explained, but can be modified in various ways. These modifications relate both to the composition of the plug and to the way in which it is produced, on the one hand, and the laser devices used, on the other. It is essential that, based on the knowledge that the foamed plastic behaves differently from the irradiation with laser, light is visible or invisible, than the same plastic in the unfoamed, encapsulated state, and that the laser is therefore used in a defocused manner, that is to say that the surface to be lasered is located in front of or, preferably, behind the point at which the laser beam is to be regarded as focused.
  • the wobble frequency is reduced accordingly, so that in the end approximately the same energy as before is used, but in a "gentler" form.
  • the basic idea of the invention is that in order to avoid damage to the thin plastic skin, the energy required for the color change of the pigments is applied in a lower density for a longer period of time. Knowing the invention, it is therefore easy for a person skilled in the field of laser technology, at least in consultation with a person skilled in the art for thermoplastics and thermally discolorable pigments, to determine the parameters which are favorable for his application.

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Closures For Containers (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

The invention relates to a method for the production of a stopper made of foamed, thermoplastic synthetic material which is branded using a laser beam. The invention is characterized in that the focus point of the used laser beam is located on a plane which is different from that of the surface of the stopper. The aim of the invention is to avoid causing damage to the thin plastic skin. To achieve this, the energy required to change the color of the pigments is applied at a lower density over a longer period of time.

Description

Propfen aus geschäumtem, thermoplastischen Kunststoff Plugs made of foamed, thermoplastic
Die Erfindung betrifft ein Verfahren zur Herstellung eines Propfen aus geschäumtem, thermoplastischen Kunststoff, der mit einem Korkbrand versehen ist.The invention relates to a method for producing a plug from foamed, thermoplastic, which is provided with a cork fire.
Ein derartiger Propfen ist aus der EP 1 022 226 A der Anmelderin bekannt.Such a plug is known from EP 1 022 226 A by the applicant.
Es soll zuerst darauf hingewiesen werden, dass einerseits die Bezeichnung „Propfen" gewählt wurde, um Mißverständnisse hinsichtlich des Materials, aus dem der Propfen oder Stoppel besteht, zu vermeiden, dass aber andererseits die Bezeichnung „Korkbrand" beibehalten wurde, die insbesondere bei Nerschlüssen von Weinflaschen aus Kork vielfach üblich ist. Insbesondere im Segment der Weine gehobener Qualität werden fast ausschließlich Korken mit Korkbrand verwendet. Die Gründe, warum seit einiger Zeit Pfropfen aus Kunststoff vermehrt verwendet werden, liegen einerseits in der zunehmenden Schwierigkeit Kork, in der notwendigen Qualität in ausreichender Menge und zu vertretbaren Preisen zu erhalten, andererseits im Wunsch, Propfen mit genau definierten und auch bei hohen Stückzahlen stets gleichbleibenden Qualitäten zu verwenden. Darüber hinaus ist es aber auch aus verschiedenen Gründen, hauptsächlich aber nicht ausschließlich psychologischer Natur, wünschenswert, auch Propfen aus Kunststoff mit einem Korkbrand zu versehen.It should first be pointed out that on the one hand the designation "plug" was chosen to avoid misunderstandings regarding the material from which the plug or stubble is made, but that on the other hand the designation "cork fire" was retained, which is particularly the case with connections from Cork wine bottles are common. Especially in the segment of high quality wines, almost exclusively corks with cork brandy are used. The reasons why plastic stoppers have been increasingly used for some time are, on the one hand, the increasing difficulty of obtaining cork in the necessary quality in sufficient quantities and at reasonable prices, and on the other hand, the desire to always use grafts with precisely defined quantities, even with large quantities to use consistent qualities. In addition, it is also desirable for various reasons, mainly but not exclusively of a psychological nature, to also provide plastic corks with a cork fire.
Für den Propfen selbst kommt aus lebensmitteltechnischen und kaufmännischen Erwägungen praktisch ausschließlich geschäumtes Polyethylen in Frage, die Herstellung des Korkbrands erreicht man ähnlich wie beim ursprünglichen Korkbrand bei einem Propfen aus Kork durch Hitzeeinwirkung, wobei aber die Verfärbung nicht durch partielle Verkohlung des Korkmaterials erzielt werden kann, sondern nur durch die Verfärbung von anorganischen, lebensmitteltauglichen Pigmenten, die bei Hitzeeinwirkung ihre Farbe ändern. In der Praxis hat sich dabei als Pigment Iriodin®, das sind Perlglanz-Pigmente auf der Basis von Glimmer und Titanoxid bzw. Eisen(IIl)-oxid, durchgesetzt, obwohl dieses Material expressis verbis in der oben angegebenen EP 1 022 226 A nicht erwähnt wird.For the plug itself, almost exclusively foamed polyethylene comes into consideration for food-technical and commercial reasons, the production of the cork fire is similar to the original cork fire with a plug made of cork by exposure to heat, but the discoloration cannot be achieved by partial charring of the cork material, but only through the discoloration of inorganic, food-grade pigments that change color when exposed to heat. In practice, Iriodin®, pearlescent pigments based on mica and titanium oxide or iron (IIl) oxide, has established itself as the pigment, although this material is not expressly mentioned in EP 1 022 226 A given above becomes.
Die Erwärmung des Propfens erfolgt mittels Lasers, da sich die Verwendung der bei Propfen aus Kork üblicherweise verwendeten Brenneisen als nicht gangbar herausgestellt hat. Es kommt dabei nämlich immer zum Zusammenbrechen des geschäumten Materials, sodass die Propfen einerseits optisch unansehnlich und andererseits in ihrer Dichtwirkung beeinträchtigt sind.The plug is heated using a laser, since the use of the branding iron usually used for cork plugs has proven to be impractical. The foamed material always breaks down, so that the plugs are visually unsightly and on the other hand their sealing effect is impaired.
Als weiteren Stand der Technik sei auf die EP 0 754 562 A verwiesen, die sich mit der Beschriftung von Formplatten, Folien und dgl. aus Polyolefinen mittels Laser beschäftigt und die Glimmerpigmente, explizit dasjenige unter der Bezeichnung Iriodin®, als thermisch verfärbbare Pigmente offenbart.As further prior art, reference is made to EP 0 754 562 A, which deals with the inscription of shaped plates, foils and the like made of polyolefins by means of laser and which discloses the mica pigments, explicitly that under the name Iriodin®, as thermally discolorable pigments.
Aus der WO 94/25513 A ist es bekannt, Propfen, insbesondere auch für Weinflaschen, aus verschiedenen styrenischen Copolymeren herzustellen, deren Mantelflächen bedrackbar sind, nachdem eine Vorbereitung der Oberfläche durch Einwirken elektromagnetischer Strahlung erfolgt ist. Ohne eine derartige Vorbereitung könnten die beim Drucken aufzubringenden Pigmente an der allzu glatten Oberfläche nicht dauerhaft aufgebracht werden.From WO 94/25513 A it is known to produce plugs, in particular also for wine bottles, from various Styrenic copolymers, the outer surfaces of which can be covered after the surface has been prepared by exposure to electromagnetic radiation. Without such preparation, the pigments to be applied during printing could not be applied permanently to the too smooth surface.
Es hat sich nun gezeigt, dass die Propfen gemäß der erstgenannten Druckschrift die an sie gestellten Anforderungen an sich zufriedenstellend erfüllen, dass aber ihre Herstellung mit einer Reihe von Problemen verbunden ist, die bis jetzt nicht zufriedenstellend gelöst wer- den konnten. Diese Probleme betreffen die Auswirkungen des Lasers auf den geschäumten Kunststoff, der sich gänzlich anders verhält, als der selbe Kunststoff in dicht vergossener Form. Insbesondere kommt es zu Aufrauhungen der Oberfläche durch Zerstören der obersten (äußersten) Schichte und damit zu Dichtigkeitsproblemen, zumindest aber zu einer optisch unattraktiven Erscheinung, die insbesondere bei der Verwendung zum Verkorken von Weinflaschen unerwünscht ist und in vielen Fällen nicht akzeptiert werden kann.It has now been shown that the plugs according to the first-mentioned publication satisfactorily meet the requirements placed on them, but that their manufacture is associated with a series of problems which have hitherto not been able to be satisfactorily solved. These problems affect the effects of the laser on the foamed plastic, which behaves completely differently than the same plastic in a densely cast form. In particular, roughening of the surface occurs by destroying the uppermost (outermost) layer and thus to tightness problems, or at least to an optically unattractive appearance, which is undesirable especially when used for corking wine bottles and in many cases cannot be accepted.
In anderen Fällen wieder kommt es zu einer ungenügenden Umfärbung des Pigments, sodass der erhaltene Korkbrand optisch unansehnlich, löchrig, streifig oder überhaupt unkenntlich ist. Auch diese Fehler führen dazu, dass die so ausgebildeten Propfen als Ausschuß betrachtet werden müssen. Es besteht somit ein Bedarf an einem Verfahren zu Herstellung eines Korkbrandes auf einem Propfen aus geschäumtem thermoplastischem Kunststoff, vorzugsweise Poly- ethylen, durch das zuverlässig und mit hoher Reproduzierbarkeit Propfen mit Korkbrand geschaffen werden, die sowohl von ihrer Funktionsfähigkeit als auch von ihrem Erscheinungsbild her zufriedenstellende Eigenschaft aufweisen. Dabei sollen diese Resultate zuverlässig reproduzierbar und mit geringem Ausschuß an Propfen durchzuführen sein. Erfindungsgemäß werden diese Ziele dadurch erreicht, dass der verwendete Laserstrahl nicht auf die Oberfläche des Propfens fokussiert wird, sondern defokussiert eingesetzt wird, wodurch eine größere Fläche mit geringerer Energiedichte als beim fokussierten Strahl getroffen wird. Nach einer Ausgestaltung der Erfindung liegt der Fokuspunkt in einer Ebene, in Richtung des Laserstrahls gesehen, vor der Oberfläche des Propfens. Diese geringere Dichte erlaubt es, den Laser mit einer geringeren Wobbelfrequenz als sie beim fokussierten Betrieb üblich ist, einzusetzen, wodurch man, über die Zeit integriert betrachtet, an jedem Ort der Belaserung in Summe zumindest in etwa wieder die gleiche Energiezufuhr erhält wie beim üblichen, fokussierten, Verwenden des Lasers mit hoher Wobbelfrequenz, aber mit dem Unterschied, dass die empfindliche, über keine namhafte Wärmekapazität verfügenden Häutchen der Schaumbläschen des geschäumten Kunststoffes nicht punktuell überhitzt und aufgeschmolzen werden. Trotzdem ist sichergestellt, dass die Pigmente, deren Verfärbung erst bei einer bestimmten Energiezufuhr bzw. Temperaturerhöhung erfolgt, die notwendige Energie zugeführt erhal- ten bzw. die notwendige Temperatur erreichen und sich zuverläßig verfärben.In other cases, there is insufficient color change of the pigment, so that the cork burn obtained is optically unsightly, holey, streaky or even unrecognizable. These mistakes also lead to the fact that the plugs thus formed must be considered as a committee. There is therefore a need for a method for producing a cork fire on a plug made of foamed thermoplastic, preferably polyethylene, by means of which cork burned plugs are created reliably and with high reproducibility, which are satisfactory both in terms of their functionality and in terms of their appearance Feature. These results should be reliably reproducible and can be carried out with a small reject of plugs. According to the invention, these objectives are achieved in that the laser beam used is not focused on the surface of the plug, but is used in a defocused manner, as a result of which a larger area is hit with a lower energy density than with the focused beam. According to one embodiment of the invention, the focal point lies in one plane, in the direction of the laser beam, in front of the surface of the plug. This lower density makes it possible to use the laser with a lower wobble frequency than is customary in focused operation, which means that, when viewed over time, at least approximately the same energy supply is obtained at each location of the laser treatment as with the usual, focused, using the laser with a high wobble frequency, but with the difference that the sensitive cuticles of the foam bubbles of the foamed plastic, which have no known heat capacity, are not selectively overheated and melted. Nevertheless, it is ensured that the pigments, the color of which only occurs when a certain amount of energy is added or the temperature rises, are supplied with the necessary energy or reach the required temperature and reliably change color.
Es haben sich insbesondere folgende Verfahrensparameter bewährt, die in Kenntnis der Erfindung auf andere Anlagen und andere Zusammensetzungen des Propfens anhand einiger weniger einfacher Versuche angewandt werden können:In particular, the following process parameters have proven themselves, which, with knowledge of the invention, can be applied to other plants and other compositions of the grafting using a few simple experiments:
Verwendet wurde das erfindungsgemäße Verfahren, wie es im Folgenden beschrieben wird, mit einem Propfen aus Polyethylen (zu beziehen bei der Firma Borealis) das mit Farbe, Treibmittel und dem verfärbbaren Pigment (Laserpatch) (alle von der Firma Gabriel Chemie) vermischt und in einer Spritzgußmaschine nach stufenweisen Erwärmen auf 185°C (Schwankung ± 3 °C) in die Form gespritzt wird. Die eingespritzte Menge, eigentlich Masse, hängt vom gewünschten Propfenvolumen, tatsächlich von der gewünschten Propfenlänge ab, üblich sind für mittellange Propfen Werte von 8,5 g. Die Kühlung der Wand der Form ist bedeutsam, da bei einer Kühlwassertemperatur von etwa 12 °C eine „Außenhaut" des Propfens entsteht, in der die Dichte des Propfens 5 bis 10 mal so hoch ist wie in seinem Inneren.The method according to the invention, as described below, was used with a plug made of polyethylene (available from Borealis) which was mixed with paint, propellant and the discolourable pigment (laser patch) (all from Gabriel Chemie) and in one Injection molding machine is injected into the mold after gradual heating to 185 ° C (fluctuation ± 3 ° C). The amount injected, actually the mass, depends on the desired volume of the plug, and in fact on the desired length of the plug; values of 8.5 g are customary for medium-length plugs. The cooling of the wall of the mold is important because at a cooling water temperature of about 12 ° C. an "outer skin" of the plug is formed, in which the density of the plug is 5 to 10 times as high as inside.
Diese Ausbildung eines in seinen Eigenschaften von den Eigenschaften im Kern des Pfrop- fens unterschiedlichen Außenbereiches, im folgenden „Außenhaut" genannt, ist sowohl für die Dichteigenschaften des Propfens als auch für sein optisches Erscheinungsbild wesentlich, aber dies ist bereits aus dem Stand der Technik bekannt und wird vom Fachmann auf dem Gebiet des Spritzgießens von geschäumten Kunststoffen, insbesondere von geschäumten Polyethylen beherrscht.This formation of an outer region which differs in its properties from the properties in the core of the plug, hereinafter referred to as "outer skin", is important both for the sealing properties of the plug and for its visual appearance, but this is already known from the prior art and is based on the specialist dominated the field of injection molding of foamed plastics, in particular foamed polyethylene.
Die Kühlzeit des Propfens hängt von der Art und Menge des verwendeten Treibgases ab, wesentlich ist, dass nach dem Ausstoßen aus der Form kein Nachtreiben des Produktes mehr erfolgt, da dadurch die Abmessungen und die Qualität der Außenhaut beeinträchtigt wären.The cooling time of the graft depends on the type and amount of the propellant gas used. It is essential that the product is no longer rubbed after it has been ejected from the mold, as this would impair the dimensions and the quality of the outer skin.
Einer derartig hergestellter Propfen wird nun mit einem lampengepumpten 30 Watt YAG Laser mit einem 254 mm Objektiv, das den Laserstrahl in einem Objektabstand von 410 mm fokussiert, belasert. Dabei wird die Geschwindigkeit auf 700 bis 900 mm/sec ein- gerichtet. Diese Geschwindigkeit ist die Superposition der Wobbeibewegung und der Vorwärtsbewegung. Bei einer Pulslänge von 0,01 msec, einer QS-Frequenz (Frequenz, wie oft der Strahl pro Minute ein- bzw. ausgeschaltet wird) zwischen 2800 und 3500 min"1 und einem Lampenstrom zwischen 25 und 30 Ampere, wurden als Abstand zwischen der Oberfläche der Propfen nicht die 410 mm bis zum Fokuspunkt, sondern 420 mm eingehalten und die Wobbelfrequenz bei 200 bis 500 Hertz gehalten. Es wurden Linienbreiten im Schriftbild zwischen 0,1 und 0,5 mm gelasert (breiter Linien sind problemlos zu erreichen) und der so erhaltene Korkbrand war einerseits optisch einwandfrei und andererseits ohne Beeinträchtigung der glatten Oberfläche entstanden. h einem Vergleichsversuch wurde der Pfropfen im Fokusabstand von 410 mm geführt und die Wobbelfrequenz wurde zwischen 200 und 600 Hertz variiert. Der erhaltenen Korkbrand wies je nach Wobbelfrequenz entweder eine rauhe bis geschmolzene Oberfläche auf oder er war wegen ungenügender Verfärbung des Pigments unbrauchbar.A plug produced in this way is now lasered with a lamp-pumped 30 watt YAG laser with a 254 mm lens that focuses the laser beam at an object distance of 410 mm. The speed is set to 700 to 900 mm / sec. This speed is the superposition of the wobble movement and the forward movement. With a pulse length of 0.01 msec, a QS frequency (frequency of how often the beam is switched on and off per minute) between 2800 and 3500 min "1 and a lamp current between 25 and 30 amperes, the distance between the The surface of the plugs is not 410 mm to the focal point, but 420 mm and the wobble frequency is kept at 200 to 500 hertz The cork fire thus obtained was on the one hand optically flawless and on the other hand without affecting the smooth surface.h In a comparative experiment, the plug was carried out at a focal distance of 410 mm and the sweep frequency was varied between 200 and 600 Hertz melted surface or it was unusable due to insufficient discoloration of the pigment.
In einem anderen erfindungsgemäßen Versuch, bei dem nicht auf eine Ausbildung einer Außenhaut geachtet wurde, bei dem aber Propfen geschaffen werden, die von vielen Anwendern, die einer anderen Anschauung über die Funktion und Wirkungsweise von Propfen anhängen, verwendet werden, wurde Material, wie das im obigen Versuch beschriebene, zu einer Endlosstange extrudiert, im Wasserbad abgekühlt und auf die gewünschte Länge geschnitten. Bei diesem Material konnte mit dem Laser der oben genannten Art mit Leistungsreduktion von 30 Watt auf 22 bis 25 Watt und einer Erhöhung der Wobbelfrequenz auf 400 bis 550 Hertz ebenfalls ein befriedigender Korkbrand ohne Beschädigung der Oberfläche erreicht werden. In einem weiteren erfindungsgemäßen Versuch wurde mittels Coextrusion eine Endlosstange aus Polyethylen mit einer Polymerfolie (im Versuch Polyethylen, aber Polyurethan ist ebenfalls möglich, notwendig ist die Lebensmitteltauglichkeit bzw. das Anpassen an das Einsatzgebiet des Pfropfens) umgeben, wobei das Pigment Iriodin nur in diesem Folienbereich entlang des Mantels enthalten war. Für die Schaffung eines befriedigenden Korkbrandes bei diesem Propfen wurde die Energie des Lasers auf 15 Watt und die Wobbelfrequenz auf 280 Hertz gesenkt.In another experiment according to the invention, in which no attention was paid to the formation of an outer skin, but in which plugs are created which are used by many users who have a different view of the function and mode of operation of plugs, material such as that described in the above experiment, extruded into an endless rod, cooled in a water bath and cut to the desired length. With this material, a satisfactory cork burn without damage to the surface could also be achieved with the laser of the type mentioned above with a power reduction from 30 watts to 22 to 25 watts and an increase in the wobble frequency to 400 to 550 hertz. In a further experiment according to the invention, an endless rod made of polyethylene was surrounded by a polymer film (in the experiment polyethylene, but polyurethane is also possible, food suitability or adaptation to the area of use of the graft is necessary), with the pigment iriodin only in this film area was included along the mantle. To create a satisfactory cork fire with this plug, the energy of the laser was reduced to 15 watts and the wobble frequency to 280 Hertz.
Die Erfindung ist nicht auf die erläuterten Beispiele beschränkt, sondern kann verschiedentlich abgewandelt werden. Diese Abwandlungen betreffen sowohl die Zusammenset- zung des Propfens als auch die Art seiner Herstellung einerseits und die verwendeten Laservorrichtungen andererseits. Wesentlich ist, dass zufolge der Erkenntnis dass der geschäumte Kunststoff sich gegenüber der Bestrahlung mit Laser, Licht sei sichtbar oder unsichtbar, anders verhält, als der gleiche Kunststoff im ungeschäumten, vergossenen Zustand und dass daher erfindungsgemäß der Laser defokussiert verwendet wird, das heißt, dass die zu belasernde Oberfläche sich vor oder, bevorzugt, hinter dem Punkt befindet, an dem der Laserstrahl als fokussiert anzusehen ist. Um die so erreichte Verringerung der spezifischen Energie (bezogen auf die belaserte Oberfläche) auszugleichen und den Pigmenten genügend Energie zum Farbumschlag zuzuführen, wird die Wobbelfrequenz entsprechend verringert, sodass letztlich in etwa die gleiche Energie wie bisher üblich aber in „schonenderer" Form zugeführt wird.The invention is not restricted to the examples explained, but can be modified in various ways. These modifications relate both to the composition of the plug and to the way in which it is produced, on the one hand, and the laser devices used, on the other. It is essential that, based on the knowledge that the foamed plastic behaves differently from the irradiation with laser, light is visible or invisible, than the same plastic in the unfoamed, encapsulated state, and that the laser is therefore used in a defocused manner, that is to say that the surface to be lasered is located in front of or, preferably, behind the point at which the laser beam is to be regarded as focused. In order to compensate for the reduction in specific energy achieved (based on the lasered surface) and to supply the pigments with sufficient energy to change color, the wobble frequency is reduced accordingly, so that in the end approximately the same energy as before is used, but in a "gentler" form.
In Kenntnis der Erfindung und der Ausführungsbeispiele ist es für den Fachmann auf dem Gebiete der Herstellung von Propfen aus geschäumten Kunststoffmaterial und der Schaffung von Korkbrand auf solchen Propfen ein leichtes, bei anderer Zusammensetzung des Propfens und Ausrüstung mit einem anderen Laser durch einige wenige einfache Versuche die für seinen Anwendungszweck günstigsten Parameter herauszufinden.Knowing the invention and the exemplary embodiments, it is easy for the person skilled in the art of producing plugs from foamed plastic material and creating cork burn on such plugs, with a different composition of the plug and equipped with a different laser by a few simple experiments Find out the most favorable parameters for its application.
Grundidee der Erfindung ist, dass zur Vermeidung von Beschädigungen der dünnen Kunst- stoffhäutchen die zum Farbumschlag der Pigmente notwendige Energie in geringerer Dichte dafür über größere Zeitdauer aufgebracht wird. Damit ist es in Kenntnis der Erfindung für den Fachmann auf dem Gebiete der Lasertechnik, zumindest in Absprache mit einem Fachmann für thermoplastische Kunststoffe und thermisch verfärbbare Pigmente ein Leichtes, die für seinen Anwendungsfall günstigen Parameter zu ermitteln. The basic idea of the invention is that in order to avoid damage to the thin plastic skin, the energy required for the color change of the pigments is applied in a lower density for a longer period of time. Knowing the invention, it is therefore easy for a person skilled in the field of laser technology, at least in consultation with a person skilled in the art for thermoplastics and thermally discolorable pigments, to determine the parameters which are favorable for his application.

Claims

Patentansprüche : Claims:
1. Verfahren zur Herstellung eines Korkbrandes auf einem Pfropfen aus geschäumtem, thermoplastischen Kunststoff, bei dem mittels eines Laserstrahls thermisch verfärbbare Pigmente umgefärbt werden, dadurch gekennzeichnet, dass der Fokuspunkt des verwendeten Laserstrahls in einer von der Oberfläche des Propfens unterschiedlichen Ebene liegt. 1. A method for producing a cork fire on a plug made of foamed, thermoplastic material, in which pigments which can be thermally discolored are recolored by means of a laser beam, characterized in that the focal point of the laser beam used lies in a different plane from the surface of the plug.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Fokuspunkt in einer Ebene, in Richtung des Laserstrahls gesehen, vor der Oberfläche des Propfens liegt.2. The method according to claim 1, characterized in that the focus point lies in one plane, seen in the direction of the laser beam, in front of the surface of the plug.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Wobbelfrequenz kleiner ist als die Wobbelfrequenz für den gleichen, aber ungeschäumten Kunststoff.3. The method according to claim 1 or 2, characterized in that the wobble frequency is lower than the wobble frequency for the same but unfoamed plastic.
4. Verfahren nach Ansprach 3, dadurch gekennzeichnet, dass die einem gegebenen Bereich des Korkbrandes über die Zeit der Belaserung integriert mit dem Laser zugeführte Energie im wesentlichen der Energie entspricht, die dem gleichen Kunststoff in ungeschäumter Form zugeführt wird. 4. The method according spoke 3, characterized in that the energy supplied to a given area of the cork fire integrated over the time of the lasering essentially corresponds to the energy which is supplied to the same plastic in a non-foamed form.
EP03763498A 2002-07-17 2003-07-02 Stopper made of foamed, thermoplastic synthetic material Expired - Lifetime EP1530608B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SI200330323T SI1530608T1 (en) 2002-07-17 2003-07-02 Stopper made of foamed, thermoplastic synthetic material
AT03763498T ATE321807T1 (en) 2002-07-17 2003-07-02 PLUG MADE OF FOAMED THERMOPLASTIC PLASTIC

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT10792002 2002-07-17
AT0107902A AT412710B (en) 2002-07-17 2002-07-17 GRAVES OF DUSTED, THERMOPLASTIC PLASTIC
PCT/AT2003/000185 WO2004007599A1 (en) 2002-07-17 2003-07-02 Stopper made of foamed, thermoplastic synthetic material

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EP1530608A1 true EP1530608A1 (en) 2005-05-18
EP1530608B1 EP1530608B1 (en) 2006-03-29

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AU (1) AU2003243796B2 (en)
CY (1) CY1105056T1 (en)
DE (1) DE50302831D1 (en)
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ITMI20042454A1 (en) * 2004-12-22 2005-03-22 Guizzardi Maria Morena METHOD FOR THE MARKING OF SYNTHETIC PLUGS TO DEVELOP THE METHOD AND SYNTHETIC PLUG
BE1016664A3 (en) * 2005-06-30 2007-04-03 Indurub Nv Plastic cork production method in which corks are cut from a strand, involves finishing cut surfaces of corks to remove surface irregularities
ES2336987B1 (en) * 2007-12-31 2011-03-22 ON-LASER SYSTEMS & APPLICATIONS, S.L. ROTATING MARKING PROCEDURE AND DEVICE.

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DE4143258A1 (en) * 1991-12-31 1993-07-01 Hoechst Ag LASER-WRITABLE PLASTIC MOLDING METHOD, METHOD FOR THEIR PRODUCTION AND USE
DE19525960A1 (en) * 1995-07-17 1997-01-23 Quarzwerke Gmbh Polyolefin for non-black laser recording, useful for packaging and car pts.
US6075223A (en) * 1997-09-08 2000-06-13 Thermark, Llc High contrast surface marking
EP0947352A1 (en) * 1998-04-03 1999-10-06 Tetra Laval Holdings & Finance Sa A method for printing on a closure and a method for manufacturing a closure suitable for laser printing
AT406476B (en) * 1999-01-25 2000-05-25 P1 Handels Gmbh PLUGS FROM FOAMED THERMOPLASTIC PLASTIC
US6780497B1 (en) * 1999-08-05 2004-08-24 Gore Enterprise Holdings, Inc. Surface modified expanded polytetrafluoroethylene devices and methods of producing the same
BR0116786B1 (en) * 2001-01-16 2012-10-02 Wine container lid made of an expanded elastomer.

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EP1530608B1 (en) 2006-03-29
AT412710B (en) 2005-06-27
CY1105056T1 (en) 2010-03-03
PT1530608E (en) 2006-08-31
ES2264773T3 (en) 2007-01-16
WO2004007599A1 (en) 2004-01-22
US20050253306A1 (en) 2005-11-17
DE50302831D1 (en) 2006-05-18
ATA10792002A (en) 2004-11-15

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