DE807893C - Process for the regeneration or de-rain of film strips made of cellulose derivatives - Google Patents
Process for the regeneration or de-rain of film strips made of cellulose derivativesInfo
- Publication number
- DE807893C DE807893C DEP7265A DEP0007265A DE807893C DE 807893 C DE807893 C DE 807893C DE P7265 A DEP7265 A DE P7265A DE P0007265 A DEP0007265 A DE P0007265A DE 807893 C DE807893 C DE 807893C
- Authority
- DE
- Germany
- Prior art keywords
- regeneration
- rain
- film
- solvent
- film strips
- 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
-
- 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
- C08J11/00—Recovery or working-up of waste materials
- C08J11/04—Recovery or working-up of waste materials of polymers
- C08J11/06—Recovery or working-up of waste materials of polymers without chemical reactions
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
- G03C11/00—Auxiliary processes in photography
- G03C11/06—Smoothing; Renovating; Roughening; Matting; Cleaning; Lubricating; Flame-retardant treatments
-
- 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
- C08J2301/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
- C08J2301/08—Cellulose derivatives
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
Description
Verfahren zur Regenerierung bzw. Entregnung von aus Cellulosederivaten bestehenden Filmbändern Die bekannte Erscheinung, daß alte Filme auf den Bildschirmen den Eindruck des Regnens erwecken, beruht darauf, daß die Blankseite der Filmbänder durch den Gebrauch, insbesondere durch die Beanspruchungen in den Vorführgeräten, und durch den Transport zahlreiche Beschädigungen erhalten, insbesondere Kratzer und Laufstreifen, die bei der Wiedergabe des Films als sogenannter Regen in Erscheinung treten. Dran hat bereits auf verschiedene Weise versucht, diese Erscheinung zu beseitigen, d. h. die Filmbänder zu regenerieren, jedoch haben diese Versuche, insbesondere bei den modernen, aus hochwertigem Material bestehenden Filmbändern, nicht zu dem gewünschten Erfolg geführt.Process for the regeneration or de-rain of cellulose derivatives existing film tapes The familiar phenomenon of old films on the screens give the impression of raining, is based on the fact that the blank side of the film tapes through the use, in particular through the stresses in the demonstration devices, and received numerous damage, especially scratches, from shipping and treads that appear as so-called rain when the film is played back step. Dran has already tried to eliminate this phenomenon in various ways, d. H. To regenerate the film tapes, however, these attempts, in particular with the modern film tapes made of high quality material, not to that desired success.
Weiterhin ist es eine bekannte Tatsache, daß die Cellulose der Filmbänder in erheblichem Maße altert. Sie verliert ihre ursprüngliche Biegsamkeit und Elastizität, wird hart und spröde und schrumpft. Die mechanischen Eigenschaften werden immer schlechter, so daß das Filmband den hohen Beanspruchungen beim Durchlaufen des Projektors nicht mehr gewachsen ist. Vor allem treten dann Perforationsbeschädigungen zahlreicher und stärker auf.Furthermore, it is a known fact that the cellulose of the film tapes ages to a considerable extent. It loses its original flexibility and elasticity, becomes hard and brittle and shrinks. The mechanical properties will always be worse, so that the film tape can withstand the heavy loads as it passes through the projector has not grown anymore. Above all, perforation damage then occurs more numerous and stronger on.
Gegenstand vorliegender Erfindung ist einVerfahren zum Regenerieren bzw. Entregnen von Filmbändern, das diese Übelstände beseitigt. Es besteht darin, daß die Blankseite der Filmbänder zunächst mittels eines geeigneten Lösungsmittels zum Quellen gebracht wird und dann mit dieser Seite in der Wärme unter gleichzeitiger Einwirkung von Lösungs-, Weichmachungs-und Verdünnungsmitteln über eine glatte Fläche geführt wird, bis eine vollkommen glatte, glänzende Oberfläche der Blankseite der Filmbänder eintritt.The present invention is a method of regeneration or de-rain of film tapes, which eliminates these inconveniences. It is, that the blank side of the film tapes first by means of a suitable solvent is made to swell and then with this side in the heat while at the same time Action of solvent, plasticizing and Thinners over A smooth surface is guided until a perfectly smooth, shiny surface the blank side of the film strips occurs.
Mit Hilfe dieses Verfahrens können sämtliche Beschädigungen der Blankseite der Filme beseitigt werden, so daß sie ebenso glatt und glänzend wie bei neuen Filmen wird. Darüber hinaus bewirkt das neue Verfahren eine Auffrischung der Cellulose, da das Altern in der Hauptsache darauf beruht, daß die Weichmachungs- bzw. Weichhaltungsmittel, die dem Celluloid bei der Herstellung zugesetzt werden, sich im Laufe der Zeit mehr und mehr verflüchtigen, und diese 'Mittel werden den Filmbändern bei dem neuen Verfahren wieder zugesetzt. Damit sind die geschilderten Übelstände restlos beseitigt und mithin eine hundertprozentige Regenerierung der Filmbänder erzielt.With the help of this procedure, all damage to the blank side of the films are eliminated so that they are as smooth and shiny as new films will. In addition, the new process refreshes the cellulose, since aging is mainly based on the fact that the softening or softening agents, which are added to the celluloid during production, will become more in the course of time and more volatilize, and these 'agents become the film tapes in the new process added again. This completely eliminates the evils described and thus a hundred percent regeneration of the film tapes is achieved.
Das Verfahren wird zweckmäßig mittels einer geeigneten Apparatur in einem Arbeitsgang durchgeführt, wobei als Glättungsinstrument z. B. eine heizbare Walze aus Glas, Porzellan, poliertem Metall usw. verwendet wird, während die Lösungs-, Weichmachungs- und Verdünnungsmittel mittels der Walzen aufgetragen werden, über die die Filmbänder geführt werden. Die zum Glätten der Blankseite der Filme verwendete heizbare Fläche braucht nicht eine Walzenoberfläche zu sein, es können dazu auch ebene oder schwach gebogene Flächen verwendet werden, sofern sie genügend glatt sind.The process is expediently carried out using a suitable apparatus in carried out in one operation, as a smoothing instrument z. B. a heatable one Roller made of glass, porcelain, polished metal, etc. is used while the solution, Softeners and thinners are applied over by means of the rollers which the film tapes are guided. The one used to smooth the blank side of the films Heatable surface does not have to be a roller surface, it can also be flat or slightly curved surfaces are used, provided they are sufficiently smooth are.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEP7265A DE807893C (en) | 1948-10-02 | 1948-10-02 | Process for the regeneration or de-rain of film strips made of cellulose derivatives |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEP7265A DE807893C (en) | 1948-10-02 | 1948-10-02 | Process for the regeneration or de-rain of film strips made of cellulose derivatives |
Publications (1)
Publication Number | Publication Date |
---|---|
DE807893C true DE807893C (en) | 1951-07-09 |
Family
ID=7361102
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEP7265A Expired DE807893C (en) | 1948-10-02 | 1948-10-02 | Process for the regeneration or de-rain of film strips made of cellulose derivatives |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE807893C (en) |
-
1948
- 1948-10-02 DE DEP7265A patent/DE807893C/en not_active Expired
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