CH434313A - Use of a varnish forming, after drying, a film detachable from its support as a means of protecting a printing ink - Google Patents

Description

  

      Use of a varnish forming after drying a film detachable from its support as a means of protecting a printing ink The present invention relates to the use of a varnish forming, after drying, a film detachable from its support,

      as a means of protecting a printing ink, said fiihn being intended to preserve said ink from the influence of air and thus to ensure its conservation.



  The preservation of printing inks is of great importance because of the appreciable losses which printers undergo due to the fact that the ink contained in opened containers dries out very quickly.



  Indeed, even when a container is tightly closed, the ink it contains dries up in a few hours, so that even frequently used inks suffer significant losses,

      if only the daily resumption of work in the imprühnerne workshops. Inks used less frequently cause even greater losses,

      opened containers which can generally be considered as lost in their entirety.



  The printing inks being expensive and entering for a not insignificant part in the general expenses of the printers, many means have been proposed, and are used, in an attempt to eliminate, or even reduce, this desiccation.

   This is how the ink contained in a container has been covered with a layer of water or oil or oiled papers for example have been applied to the surface of the ink.



       However, not only do these methods only very imperfectly achieve the intended purpose, but also they present other drawbacks: for example, water has only a very limited effect while oil mixes. in ink and then keeps it from drying on the paper.

   The application of wet paper causes waste of time and can only be applied if the surface of the ink in the container is perfectly even; although even in this case, ü2 generally remains air bubbles rendering the operation inefficient.

      The present invention provides a simple, fast, inexpensive and perfectly efficient means; -protect the surface of the printing ink contained in a container and, therefore, ensure perfect preservation of this ink.



  The varnishes which have the: particularity of forming, a dry hay, a film detachable from the support on which they are affixed are known per se and are known as <t peeling.

   They are usually used to protect glass or metallic coverings in building structures, during construction; for packing damaged goods in transit;

    or again to coat booths for spray painting, booths that we want to be able to rid, from time to time, of the layers of paint that have accumulated there.



  Such varnishes, which can be used, according to the present invention, as a means of protecting printing inks, may, for example, have the following compositions
EMI0001.0148
  
    AT)
<tb> Ethylceslulose <SEP>. <SEP>. <SEP>. <SEP>. <SEP>. <SEP>. <SEP>. <SEP>. <SEP>. <SEP>. <SEP>. <SEP>. <SEP>. <SEP>. <SEP>. <SEP> 25 <SEP> parts
<tb> Castor <SEP> <SEP> oil <SEP>. <SEP>. <SEP>. <SEP>. <SEP>. <SEP>. <SEP>. <SEP>. <SEP>. <SEP>. <SEP>. <SEP>. <SEP>. <SEP>. <SEP>. <SEP> 10 <SEP> parts
<tb> Mineral <SEP> oil <SEP> to <SEP> low <SEP> point <SEP> of aniline <SEP>. <SEP>.

   <SEP> 62 <SEP> parts
<tb> Octylphenol <SEP>. <SEP>. <SEP>. <SEP>. <SEP>. <SEP>. <SEP>. <SEP>. <SEP>. <SEP>. <SEP>. <SEP>. <SEP>. <SEP>. <SEP>. <SEP>. <SEP> 3 <SEP> parts B) 1-10% solution of polyvinyl chloride in organic solvents (ketones):

         1-10% solution of m # trocellulose in ether, benzene, or ketone with camphor (0.1-5%) as a plasticizer.



  The so-called peeling varnishes mentioned above, or others still, are used, for example, as follows They are first of all diluted by means of ketones such as acetone,

      or methyl ethyl ketone, for example. Ethers such as ethyl ether, isopropyl ether, dioxane or tetrahydrofuran could also be used as diluents;

      or else closed cell-solves, aromatic hydrocarbons such as ben zene, toluene, xylene, or aliphatic hydrocarbons such as hexane, cyclohexane, petroleum ether, light paraffins.



  These varnishes thus diluted are then affixed, for example by spraying, on the printing ink to be protected.



       Thanks to the dilution, the layer of varnish affixed to the ink is very thin; so that it dries almost instantly, the thinner being. very volatile. .

      <B> It </B> is advantageous to condition the diluted varnish in aerosol form, which further facilitates its application.



       Experience has shown that printing inks in this way: protected can be kept practically indefinitely, even when the containers which contain them are left open. The savings thus achieved,

      compared to conventional protection processes, can reduce printer ink costs by up to 20% plus.

 

Claims (1)

CLAIM Use of a varnish forming, after drying, a film detachable from its support, as a means of protecting a printing ink, said film being intended to preserve said ink from the influence of air and thus to ensure its conservation.