CH125244A - Process for the production of printing forms suitable for the photomechanical copying process. - Google Patents

Process for the production of printing forms suitable for the photomechanical copying process.

Info

Publication number
CH125244A
CH125244A CH125244DA CH125244A CH 125244 A CH125244 A CH 125244A CH 125244D A CH125244D A CH 125244DA CH 125244 A CH125244 A CH 125244A
Authority
CH
Switzerland
Prior art keywords
production
forms suitable
printing forms
zinc
printing
Prior art date
Application number
Other languages
German (de)
Inventor
Ullmann G M B H F
Original Assignee
Ullmann G M B H F
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 Ullmann G M B H F filed Critical Ullmann G M B H F
Publication of CH125244A publication Critical patent/CH125244A/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N3/00—Preparing for use and conserving printing surfaces
    • B41N3/03—Chemical or electrical pretreatment
    • B41N3/038—Treatment with a chromium compound, a silicon compound, a phophorus compound or a compound of a metal of group IVB; Hydrophilic coatings obtained by hydrolysis of organometallic compounds

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Printing Plates And Materials Therefor (AREA)

Description

  

  Verfahren zur Herstellung von für den     photomechanischen        Kopierprozess     geeigneten Druckformen.    Es     ist    bekannt, dass das Zink als Schicht  träger für     Chroma.tpräparate    bei Herstellung       photomechanisch    gewonnener     Druckfoi-nnen     auf die aufgebrachten Präparate ungünstig  reagiert.

   Dieser Umstand hat schon vor Jahr  zehnten bei Versuchen, den Lichtdruck auf  Zinkplatten auszuführen, sich äusserst hin  derlich gezeigt, deswegen hat man versucht,  den Einfluss des metallischen Zinkes auf       Chromatpräparate    durch     entsprechende        Yor-          behandlung    des     lletalles    abzuschwächen.  



  Man hat durch Behandeln mit verdünnter  Chromsäure, durch Übergiessen von Kolloid  schichten, durch Baden der     Zinkplatten    in  Alaun und verdünnter Salpetersäure den un  günstigen Einfluss des Zinkes verringert,  aber nicht restlos aufgehoben, so dass es wün  schenswert erschien, das Verhalten des Zin  kes gegenüber     Chromatprä.paraten    genau zu  untersuchen, um eine neue Methode zu fin  den, das Zink als Schichtträger durch die ge  eignete Behandlung gegenüber- diesen Schich  ten möglichst indifferent zu machen.  



  Die vorliegende Erfindung ist das Ergeb  nis derartiger     Arbeiten.     



  Es wurde gefunden, dass Salzlösungen von    Metallen, die Doppelsalze bilden und die auf  metallisches Zink einwirken, wie zum Bei  spiel Aluminiumchlorid, zur     Vorbehandlung     von     Metallplatten        ziir    Herstellung von Druck  formen sich äusserst geeignet erweisen.  



  Nach diesem Verfahren behandelte Zink  platten bewähren sich auch für Umdruck  zwecke. Gegenüber der bisherigen Arbeits  weise stellt diese     Vorpräparation    für Um  druckzwecke eine Abkürzung der Arbeitszeit  dar und hat ausserdem den Vorteil, dass durch  diese     Voipräparation    die Haltbarkeit der Um  druckplatte erhöht wird.  



  Ein Ausführungsbeispiel des Verfahrens  sei nachstehend gegeben:  Die gesäuberte und fettfrei gemachte       Zinkplatte    wird in ein Bad mit einer Lösung  von beispielsweise 40 % Aluminiumchlorid  etwa zwei bis vier Minuten eingelegt, nach  dem Bad gut gespült und getrocknet. Nach  dieser Behandlung ist die Platte gebrauchs  fertig für den     Aufguss    der     Chromatschicht.  



  Process for the production of printing forms suitable for the photomechanical copying process. It is known that zinc, as a layer carrier for chroma preparations, reacts unfavorably to the preparations applied during the production of photomechanically obtained printing foils.

   This circumstance was shown to be extremely difficult decades ago in attempts to carry out collotype printing on zinc plates, which is why attempts have been made to weaken the influence of metallic zinc on chromate preparations by appropriate pre-treatment of the metal.



  By treating with dilute chromic acid, pouring colloid layers over them, bathing the zinc plates in alum and dilute nitric acid, the unfavorable influence of zinc was reduced, but not completely eliminated, so that it seemed desirable to improve the behavior of the zinc towards chromate prep .Paraten carefully examined in order to find a new method to make the zinc as a layer carrier through the appropriate treatment to these layers as indifferent as possible.



  The present invention is the result of such work.



  It has been found that salt solutions of metals which form double salts and which act on metallic zinc, such as aluminum chloride, are extremely suitable for the pretreatment of metal plates for the production of printing forms.



  Zinc plates treated according to this process also prove useful for transfer printing purposes. Compared to the previous way of working, this prepreparation for order printing purposes is a shortening of the working time and also has the advantage that the durability of the order printing plate is increased by this Voipräparation.



  An exemplary embodiment of the method is given below: The cleaned and grease-free zinc plate is placed in a bath with a solution of 40% aluminum chloride, for example, for about two to four minutes, rinsed well after the bath and dried. After this treatment, the plate is ready to be used for the infusion of the chromate layer.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung von für den photomechanischen Kopierprozess und den Umdruch, geeigneten Zinkdruckformen, da durch gekennzeichnet, dass die gesäuberte und fettfrei gemachte Zinkplatte mit Metallsalzen vorbehandelt wird, die die Eigenschaft be. sitzen, Doppelsalze zu bilden. UNTERANSPRUCH: . - Verfahren nach dem Patentanspruch, da durch gekennzeichnet, dass als Doppelsalz bil dendes Mittel Aluminiumchlorid angewandt wird. PATENT CLAIM: A process for the production of zinc printing forms suitable for the photomechanical copying process and printing, as characterized in that the cleaned and grease-free zinc plate is pretreated with metal salts which have the property. sit to form double salts. SUBClaim:. - The method according to the patent claim, characterized in that aluminum chloride is used as the double salt-forming agent.
CH125244D 1927-03-23 1927-03-23 Process for the production of printing forms suitable for the photomechanical copying process. CH125244A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH125244T 1927-03-23

Publications (1)

Publication Number Publication Date
CH125244A true CH125244A (en) 1928-04-02

Family

ID=4383819

Family Applications (1)

Application Number Title Priority Date Filing Date
CH125244D CH125244A (en) 1927-03-23 1927-03-23 Process for the production of printing forms suitable for the photomechanical copying process.

Country Status (1)

Country Link
CH (1) CH125244A (en)

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