EP0036469B1 - Process for the manufacture of a sliding layer on the surface of the aluminium layer of a recording substrate - Google Patents
Process for the manufacture of a sliding layer on the surface of the aluminium layer of a recording substrate Download PDFInfo
- Publication number
- EP0036469B1 EP0036469B1 EP81100299A EP81100299A EP0036469B1 EP 0036469 B1 EP0036469 B1 EP 0036469B1 EP 81100299 A EP81100299 A EP 81100299A EP 81100299 A EP81100299 A EP 81100299A EP 0036469 B1 EP0036469 B1 EP 0036469B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- layer
- soap
- aluminum
- manufacture
- sliding layer
- 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.)
- Expired
Links
Classifications
-
- 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
- B41M5/24—Ablative recording, e.g. by burning marks; Spark recording
- B41M5/245—Electroerosion or spark recording
Definitions
- the invention relates to a method for applying a sliding layer on the surface of a recording medium coated with a thin aluminum layer.
- lubricants on the aluminum layer can reduce the wear marks or scratch marks more or less.
- Layers of oil, fat, wax, but also of metal oxides have already been described, as described, for example, in DE-C-849 609 and DE-B-1011722, DE-B-1014128 and DE-B-1 025 259 in individual can be removed.
- Such layers have not proven to be advantageous for the writing process because of their insulating properties. Either the layers are too thick, then they represent an insulating layer; or they are too thin and therefore ineffective or, if they consist of liquid materials, they are absorbed by the lacquer layer and the paper after a certain time. It is also known that soap is one of the most stable and cheapest lubricants for reducing friction at high surface pressure.
- EP-A-35105 which is considered to be state of the art according to Art. 54 (3) and (4) EPC, the aluminum is allowed to react with a fatty acid to form aluminum soap, so that in particular a soap layer is formed on the surface, e.g. B. from aluminum oleate, forms as a sliding layer.
- a soap layer is formed on the surface, e.g. B. from aluminum oleate, forms as a sliding layer.
- the high effectiveness of such a layer has already been confirmed by numerous tests.
- aluminum soap is not water-soluble and, according to the older proposal, is also firmly built into the aluminum layer.
- the object of the invention is to achieve a reduction, if not a complete elimination, of these scratch and grinding marks on the surface of a recording medium coated with an aluminum layer in a new method.
- a metal soap is applied in a layer thickness of 2 to 1000 nm as a sliding layer on the surface of the aluminum layer.
- Saturated metal soaps, unsaturated metal soaps or mixtures of saturated and unsaturated metal soaps from the group of the stearates, palmitates, oleates, linoleates, resinates, laurates, naphthenates and tallates are preferably used for this purpose.
- a hydrophilic or hydrophobic soap will be used.
- metal soaps are conductors per se, even if they are poor. However, since these metal soaps melt in any case at temperatures above a maximum of 200 ° C., they behave like an electrolyte at the high temperatures occurring at the tips of the electrodes. H. they conduct the electrical current.
- these subsequently applied soap layers are very easy to produce and can be made hydrophilic or hy by appropriate choice of metal soap be made drophobic. They can also be washable or waterproof.
- metal soap when choosing the metal soap, one can favorably influence the melting point of the aluminum by appropriately selecting the metal component of the soap. If, for example, a soap is used, the metal component of which is tin, zinc, magnesium or lithium, then the high temperatures occurring at the electrodes result in a more or less severe reduction in the base metal and a eutectic alloy of aluminum and e.g. B. lithium, which leads to a noticeable eutectic lowering of the melting point.
- the very rapidly solidifying aluminum that normally adheres to the electrode end faces from the burn-out process could be kept liquid longer, preferably until it is stripped off on the surfaces of the recording medium that are not described. Normally, the aluminum solidifies immediately after the burn-out process and has to be rubbed off on the surfaces not described, which gave rise to the ugly signs of grinding and scratching.
- these novel layers consisting of metal soaps can be used in addition to a chemically bonded soap layer according to EP-A-35105, as a result of which grinding and scratch marks can be completely removed.
- these soaps can also be used in such a way that the reflection behavior of the aluminum surface can be changed in the direction of diffuse reflection.
- these metal soaps can be used to preferentially absorb individual wavelength ranges from the continuum.
Landscapes
- Lubricants (AREA)
- Photoreceptors In Electrophotography (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
Description
Die Erfindung betrifft ein Verfahren zum Aufbringen einer Gleitschicht auf die Oberfläche eines mit einer dünnen Aluminiumschicht überzogenen Aufzeichnungsträgers.The invention relates to a method for applying a sliding layer on the surface of a recording medium coated with a thin aluminum layer.
Beim elektrographischen Aufzeichnungsvorgang auf mit einer Aluminiumschicht überzogenen Folie oder auf mit einer Aluminiumschicht und einer Lackschicht überzogenem Papier ist es erforderlich, daß die Schreibelektroden direkten elektrischen Kontakt mit der Aluminiumschicht haben. Nahezu jedes Aufzeichnungsgerät ist für einen kontinuierlichen Schreibvorgang entworfen, d. h. es findet immer eine Relativbewegung zwischen den Schreibelektroden und dem mit Aluminium beschichteten Aufzeichnungsträger statt. Auch während dieser Relativbewegung muß der elektrische Kontakt zwischen den Elektroden und dem mit Aluminium beschichteten Aufzeichnungsträger gewährleistet sein, d. h. die Elektroden schleifen auf der Aluminiumschicht, unabhängig davon, ob gerade geschrieben wird oder nicht. Dieses Schleifen hinterläßt in den Bereichen, in denen das Aluminium nicht ausgebrannt, d. h. verdampft wurde, Schleif-oder Kratzspuren, deren Stärke und Eigenart einmal von der Rauhigkeitsstruktur und den verwendeten Materialien bei der Herstellung des Aufzeichnungsträgers, zum anderen von der Größe und Anordnung der einzelnen Elektroden abhängen. Insbesondere bei sehr dünnen Elektroden für qualitativ hochwertige Aufzeichnungen ergeben sich wegen der relativ hohen Flächenpressung starke Spuren, die im günstigsten Fall nur optisch unschön sind, im ungünstigsten Fall aber eine Wiedergabe oder Reproduktion des beschriebenen Aufzeichnungsträgers, beispielsweise durch Kopieren unmöglich machen.In the electrographic recording process on foil coated with an aluminum layer or on paper coated with an aluminum layer and a lacquer layer, it is necessary that the writing electrodes have direct electrical contact with the aluminum layer. Almost every recorder is designed for continuous writing, i.e. H. there is always a relative movement between the writing electrodes and the aluminum-coated recording medium. Even during this relative movement, the electrical contact between the electrodes and the aluminum-coated recording medium must be ensured. H. the electrodes grind on the aluminum layer, regardless of whether it is currently being written or not. This grinding leaves in the areas where the aluminum does not burn out, i.e. H. was evaporated, grinding or scratching marks, the strength and nature of which depend on the roughness structure and the materials used in the production of the recording medium and on the size and arrangement of the individual electrodes. Particularly in the case of very thin electrodes for high-quality recordings, there are strong traces because of the relatively high surface pressure, which in the best case are only optically unsightly, but in the worst case make reproduction or reproduction of the described record carrier impossible, for example by copying.
Es ist bekannt, daß Gleitmittel auf der Aluminiumschicht die Schleifspuren oder Kratzspuren mehr oder weniger reduzieren können. Schichten aus Öl, Fett, Wachs, aber auch aus Metalloxiden sind bereits beschrieben worden, wie dies beispielsweise aus der DE-C-849 609 und den DE-B-1011722, DE-B-1014128 und DE-B-1 025 259 im einzelnen entnommen werden kann.It is known that lubricants on the aluminum layer can reduce the wear marks or scratch marks more or less. Layers of oil, fat, wax, but also of metal oxides have already been described, as described, for example, in DE-C-849 609 and DE-B-1011722, DE-B-1014128 and DE-B-1 025 259 in individual can be removed.
Solche Schichten haben sich wegen ihrer lsoliereigenschaften als nicht vorteilhaft für den Schreibvorgang erwiesen. Entweder sind die Schichten zu dick, dann stellen sie eine Isolierschicht dar; oder sie sind zu dünn und damit wirkungslos oder sie werden dann, wenn sie aus flüssigen Materialien bestehen, nach einer gewissen Zeit von der Lackschicht und dem Papier aufgenommen. Es ist ferner bekannt, daß Seife für die Reduzierung der Reibung bei hoher Flächenpressung eines der stabilsten und dabei billigsten Schmiermittel darstellt.Such layers have not proven to be advantageous for the writing process because of their insulating properties. Either the layers are too thick, then they represent an insulating layer; or they are too thin and therefore ineffective or, if they consist of liquid materials, they are absorbed by the lacquer layer and the paper after a certain time. It is also known that soap is one of the most stable and cheapest lubricants for reducing friction at high surface pressure.
Ferner wurde in der EP-A-35105, die nach Art. 54(3) und (4) EPÜ als Stand der Technik gilt, das Aluminium mit einer Fettsäure zu Aluminiumseife reagieren zu lassen, so daß sich insbesondere auf der Oberfläche eine Seifenschicht, z. B. aus Aluminiumoleat, als Gleitschicht bildet. Die hohe Wirksamkeit einer solchen Schicht wurde bereits durch zahlreiche Versuche bestätigt. Allerdings ist Aluminiumseife nicht wasserlöslich und gemäß dem älteren Vorschlag zudem noch fest in die Aluminiumschicht eingebaut.Furthermore, in EP-A-35105, which is considered to be state of the art according to Art. 54 (3) and (4) EPC, the aluminum is allowed to react with a fatty acid to form aluminum soap, so that in particular a soap layer is formed on the surface, e.g. B. from aluminum oleate, forms as a sliding layer. The high effectiveness of such a layer has already been confirmed by numerous tests. However, aluminum soap is not water-soluble and, according to the older proposal, is also firmly built into the aluminum layer.
Falls z. B. für eine nachträgliche andersartige Beschriftung die nicht beschriebenen Teile des Aufzeichnungsträgers hydrophil sein müßten, könnte diese hydrophobe Aluminiumseife ohne Beschädigung der nur etwa 30 bis 40 nm dicken Aluminiumschicht nicht entfernt werden. Auch könnte die Stärke dieser bestenfalls monomolekularen Seifenschicht bei besonders hoher Belastung zu gering sein.If e.g. B. for a subsequent different type of inscription, the parts of the recording medium which were not described would have to be hydrophilic, this hydrophobic aluminum soap could not be removed without damaging the only about 30 to 40 nm thick aluminum layer. The thickness of this, at best, monomolecular soap layer could also be too low under particularly high loads.
Es hat sich durch Untersuchungen unter dem Rasterelektronen-Mikroskop gezeigt, daß während des Ausbrennvorgangs in einem Elektroerosionsdrucker sich metallisches Aluminium auf den Stirnflächen der Elektroden ablagert, dort erstarrt und auf den nicht beschriebenen Stellen des Papiers abgerieben werden muß, was besonders starke Kratzspuren hinterläßt.Investigations under a scanning electron microscope have shown that during the burn-out process in an electroerosion printer, metallic aluminum is deposited on the end faces of the electrodes, solidifies there and has to be rubbed off on the areas of the paper not described, which leaves particularly strong scratch marks.
Der Erfindung liegt nun die Aufgabe zugrunde, in einem neuen Verfahren eine Verringerung, wenn nicht gar eine vollständige Beseitigung dieser Kratz- und Schleifspuren auf der Oberfläche eines mit einer Aluminiumschicht überzogenen Aufzeichnungsträgers zu erzielen.The object of the invention is to achieve a reduction, if not a complete elimination, of these scratch and grinding marks on the surface of a recording medium coated with an aluminum layer in a new method.
Dies wird erfindungsgemäß dadurch erreicht, daß eine Metallseife in einer Schichtdicke von 2 bis 1000 nm als Gleitschicht auf die Oberfläche der Aluminiumschicht aufgebracht wird. Vorzugsweise nimmt man hierzu gesättigte Metallseifen, ungesättigte Metallseifen oder Mischungen aus gesättigten und ungesättigten Metallseifen aus der Gruppe der Stearate, Palmitate, Oleate, Linoleate, Resinate, Laurate, Naphthenate und Tallate. Je nach Verwendungszweck wird man eine hydrophile oder hydrophobe Seife verwenden.This is achieved according to the invention in that a metal soap is applied in a layer thickness of 2 to 1000 nm as a sliding layer on the surface of the aluminum layer. Saturated metal soaps, unsaturated metal soaps or mixtures of saturated and unsaturated metal soaps from the group of the stearates, palmitates, oleates, linoleates, resinates, laurates, naphthenates and tallates are preferably used for this purpose. Depending on the intended use, a hydrophilic or hydrophobic soap will be used.
Von ganz besonderem Vorteil ist es aber, wenn man eine Seife verwendet, deren Metallkomponente Zinn, Zink, Magnesium oder Lithium ist.However, it is particularly advantageous to use a soap whose metal component is tin, zinc, magnesium or lithium.
Es muß darauf hingewiesen werden, daß es besonders günstig ist, wenn die Metallseife in der Weise aufgebracht wird, daß die natürlichen Unebenheiten, d. h. die Rauhigkeit der Aufzeichnungsträgeroberfläche im wesentlichen eingeebnet und ausgeglichen wird.It must be pointed out that it is particularly favorable if the metal soap is applied in such a way that the natural unevenness, i. H. the roughness of the recording medium surface is essentially leveled and compensated.
Wesentlich ist dabei, daß Metallseifen an sich, wenn auch schlechte, Leiter sind. Da diese Metallseifen aber bei Temperaturen oberhalb von maximal 200°C in jedem Falle geschmolzen sind, verhalten sie sich bei den hohen, an den Spitzen der Elektroden auftretenden Temperaturen wie ein Elektrolyt, d. h. sie leiten den elektrischen Strom.It is essential that metal soaps are conductors per se, even if they are poor. However, since these metal soaps melt in any case at temperatures above a maximum of 200 ° C., they behave like an electrolyte at the high temperatures occurring at the tips of the electrodes. H. they conduct the electrical current.
Dieses neuartige Verfahren hat eine ganze Reihe von Vorteilen. Zunächst sind diese nachträglich aufgebrachten Seifenschichten sehr leicht herzustellen und können durch entsprechende Wahl der Metallseife hydrophil oder hydrophob gestaltet werden. Ebenso können sie abwaschbar oder wasserfest sein. Von ganz besonderem Vorteil ist es aber, wenn man bei der Auswahl der Metallseife durch entsprechende Wahl der Metallkomponente der Seife den Schmelzpunkt des Aluminiums günstig beeinflussen kann. Wenn man beispielsweise eine Seife verwendet, deren Metallkomponente Zinn, Zink, Magnesium oder Lithium ist, dann findet durch die an den Elektroden auftretenden hohen Temperaturen eine mehr oder weniger starke Reduktion des Basismetalls statt und es bildet sich eine eutektische Legierung aus Aluminium und z. B. Lithium, was zu einer merklichen eutektischen Schmelzpunktserniedrigung führt. Das normalerweise auf den Elektrodenstirnflächen vom Ausbrennvorgang her haftende, sehr rasch erstarrende Aluminium könnte länger, vorzugsweise so lange flüssig gehalten werden, bis es auf den nicht beschriebenen Flächen des Aufzeichnungsträgers abgestreift ist. Normalerweise erstarrt das Aluminium unmittelbar nach dem Ausbrennvorgang und muß auf den nicht beschriebenen Flächen abgerieben werden, was Anlaß zu den häßlichen Schleif- und Kratzspuren war.This new process has a number of advantages. First of all, these subsequently applied soap layers are very easy to produce and can be made hydrophilic or hy by appropriate choice of metal soap be made drophobic. They can also be washable or waterproof. However, it is of particular advantage if, when choosing the metal soap, one can favorably influence the melting point of the aluminum by appropriately selecting the metal component of the soap. If, for example, a soap is used, the metal component of which is tin, zinc, magnesium or lithium, then the high temperatures occurring at the electrodes result in a more or less severe reduction in the base metal and a eutectic alloy of aluminum and e.g. B. lithium, which leads to a noticeable eutectic lowering of the melting point. The very rapidly solidifying aluminum that normally adheres to the electrode end faces from the burn-out process could be kept liquid longer, preferably until it is stripped off on the surfaces of the recording medium that are not described. Normally, the aluminum solidifies immediately after the burn-out process and has to be rubbed off on the surfaces not described, which gave rise to the ugly signs of grinding and scratching.
Ferner können diese neuartigen aus Metallseifen bestehenden Schichten zusätzlich zu einer chemisch gebundenen Seifenschicht gemäß der EP-A-35105 angewendet werden, wodurch Schleif- und Kratzspuren vollständig entfernt werden können.Furthermore, these novel layers consisting of metal soaps can be used in addition to a chemically bonded soap layer according to EP-A-35105, as a result of which grinding and scratch marks can be completely removed.
Ferner lassen sich diese Seifen auch so einsetzen, daß das Reflexionsverhalten der Aluminiumoberfläche in Richtung auf diffuse Reflexion verändert werden kann. Außerdem können durch diese Metallseifen einzelne Welenlängenbereiche aus dem Kontinuum bevorzugt absorbiert werden.Furthermore, these soaps can also be used in such a way that the reflection behavior of the aluminum surface can be changed in the direction of diffuse reflection. In addition, these metal soaps can be used to preferentially absorb individual wavelength ranges from the continuum.
Wie die mit den neuartigen Überzügen aus Metallseifen auf der Oberfläche der Aluminiumschicht von Aufzeichnungsträgern durchgeführten Versuche in geradezu frappierender Weise zeigen, lassen sich die bisher so störenden Schleif- und Kratzspuren tatsächlich vollkommen vermeiden, d. h., daß selbst unter starker Vergrößerung keinerlei Schleifspuren mehr feststellbar sind, unabhängig davon, ob die Seifenschicht auf der Oberfläche nach dem Druckvorgang verbleibt oder aber im Falle einer wasserlöslichen Seife abgewaschen wird.As the experiments carried out with the novel coatings of metal soaps on the surface of the aluminum layer of recording media show in an almost striking manner, the grinding and scratching traces that have been so disruptive can actually be completely avoided. that is, even under strong magnification, no traces of grinding can be detected, regardless of whether the soap layer remains on the surface after the printing process or is washed off in the case of a water-soluble soap.
Claims (4)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19803011591 DE3011591A1 (en) | 1980-03-26 | 1980-03-26 | METHOD FOR REDUCING GRINDING OR SCRATCH TRACKS ON THE SURFACE OF A RECORDING CARRIER |
| DE3011591 | 1980-03-26 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0036469A2 EP0036469A2 (en) | 1981-09-30 |
| EP0036469A3 EP0036469A3 (en) | 1982-03-17 |
| EP0036469B1 true EP0036469B1 (en) | 1985-01-02 |
Family
ID=6098329
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP81100299A Expired EP0036469B1 (en) | 1980-03-26 | 1981-01-16 | Process for the manufacture of a sliding layer on the surface of the aluminium layer of a recording substrate |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US4359484A (en) |
| EP (1) | EP0036469B1 (en) |
| JP (1) | JPS56150781A (en) |
| DE (2) | DE3011591A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3017450A1 (en) * | 1980-05-07 | 1981-11-12 | Robert Bosch Gmbh, 7000 Stuttgart | RECORD CARRIER FOR REGISTRATION DEVICES |
| JPS5737737A (en) * | 1980-08-15 | 1982-03-02 | Fuji Photo Film Co Ltd | Magnetic recording medium |
| US4403224A (en) * | 1982-01-22 | 1983-09-06 | Exxon Research And Engineering Co. | Smudge-free electrosensitive recording medium and method of inhibiting smudge formation on said medium |
| DE3329981A1 (en) * | 1983-08-19 | 1985-03-07 | Robert Bosch Gmbh, 7000 Stuttgart | RECORD CARRIER FOR REGISTRATION DEVICES |
| DE69313835T2 (en) * | 1993-06-11 | 1998-04-02 | Agfa Gevaert Nv | Heat recording process and process for the production of printing plates therewith |
| DE4412019C2 (en) * | 1994-04-07 | 1996-08-01 | Alcan Gmbh | Metallized paper cigarette wrapper and process for its manufacture |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE849609C (en) * | 1950-11-06 | 1952-09-15 | Bosch Gmbh Robert | Tape-shaped recording medium for recording measuring instruments |
| US3620831A (en) * | 1968-12-30 | 1971-11-16 | Honeywell Inc | Electrographic recording medium |
| GB1430065A (en) * | 1972-05-12 | 1976-03-31 | Johnson & Johnson | Nonwoven fabric |
| GB2029266B (en) * | 1978-06-26 | 1982-05-06 | Fuji Photo Film Co Ltd | Thermal recording elements |
| US4193881A (en) * | 1978-09-06 | 1980-03-18 | Swiss Aluminium Ltd. | Lubricant for metal strip |
| US4342043A (en) * | 1980-02-11 | 1982-07-27 | Exxon Research & Engineering Co. | Sheet feeding for a facsimile system with anti-static electricity additive |
| JPS56123587A (en) * | 1980-03-04 | 1981-09-28 | Ricoh Co Ltd | Copying drum |
-
1980
- 1980-03-26 DE DE19803011591 patent/DE3011591A1/en not_active Withdrawn
-
1981
- 1981-01-16 EP EP81100299A patent/EP0036469B1/en not_active Expired
- 1981-01-16 DE DE8181100299T patent/DE3167990D1/en not_active Expired
- 1981-02-25 US US06/238,289 patent/US4359484A/en not_active Expired - Fee Related
- 1981-03-13 JP JP3551181A patent/JPS56150781A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| EP0036469A3 (en) | 1982-03-17 |
| DE3167990D1 (en) | 1985-02-14 |
| EP0036469A2 (en) | 1981-09-30 |
| JPS56150781A (en) | 1981-11-21 |
| DE3011591A1 (en) | 1981-10-01 |
| US4359484A (en) | 1982-11-16 |
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