Ti alloy for positive electrode for electrocoagulation printing, positive electrode and printing apparatus

Abstract

A Ti alloy for a positive electrode for electrocoagulation printing contains, as a weight percentage, 28.0 to 35.0% of Al, 0.1% or less of C, 0.05% or less of N, 0.3% or less of O, and Ti. The Ti alloy may further contain one or more elements selected from the group consisting of 0.5 to 15.0% of Nb, 0.5 to 15.0% of Ta, 0.1 to 1.0% of Hf, 0.1 to 1.0% of Zr, 1.0 to 6.0% of W, 1.0 to 6.0% of Mo, 0.5 to 6.0% of Cr, 0.5 to 6.0% of Mn, 0.5 to 6.0% of V, 0.1 to 1.0% of Si, and 0.005 to 0.10% of B, by weight. A positive electrode for electrocoagulation printing has a surface composed of a Ti alloy containing Al.

What is claimed is:  
     
         1 . A Ti alloy for a positive electrode for electrocoagulation printing containing, as a weight percentage, 28.0 to 35.0% of Al, 0.1% or less of C, 0.05% or less of N, 0.3% or less of O, and Ti.  
     
     
         2 . A Ti alloy according to  claim 1 , further containing at least one element selected from the group I consisting of 0.5 to 15.0% of Nb, 0.5 to 15.0% of Ta, 0.1 to 1.0% of Hf, 0.1 to 1.0% of Zr, 1.0 to 6.0% of W, and 1.0 to 6.0% of Mo, by weight.  
     
     
         3 . A Ti alloy according to  claim 1 , further containing at least one element selected from the group II consisting of 0.5 to 6.0% of Cr, 0.5 to 6.0% of Mn, and 0.5 to 6.0% of V, by weight.  
     
     
         4 . A Ti alloy according to  claim 2 , further containing at least one element selected from the group II consisting of 0.5 to 6.0% of Cr, 0.5 to 6.0% of Mn, and 0.5 to 6.0% of V, by weight.  
     
     
         5 . A Ti alloy according to  claim 1 , further containing at least one element selected from the group III consisting of 0.1 to 1.0% of Si, and 0.005 to 0.10% of B, by weight.  
     
     
         6 . A Ti alloy according to  claim 2 , further containing at least one element selected from the group III consisting of 0.1 to 1.0% of Si, and 0.005 to 0.10% of B, by weight.  
     
     
         7 . A Ti alloy according to  claim 3 , further containing at least one element selected from the group III consisting of 0.1 to 1.0% of Si, and 0.005 to 0.10% of B, by weight.  
     
     
         8 . A Ti alloy according to  claim 4 , further containing at least one element selected from the group III consisting of 0.1 to 1.0% of Si, and 0.005 to 0.10% of B, by weight.  
     
     
         9 . A positive electrode for electrocoagulation printing having a surface composed of a Ti alloy containing Al.  
     
     
         10 . A positive electrode according to  claim 9 , wherein the Ti alloy containing Al is the Ti alloy of  claim 1 .  
     
     
         11 . An electrocoagulation printing apparatus comprising a revolving positive electrode having a surface composed of a Ti alloy containing Al, an ink feeding device for feeding an ink onto the surface of the positive electrode, a printing head comprising a plurality of negative electrodes for forming coagulated ink dots representative of a desired image on the surface of the positive electrode by coagulating the ink by electrical energization, a removal device for removing non-coagulated ink from the surface of the positive electrode, and a transfer device for printing the image by transferring the coagulated ink dots from the surface of the positive electrode onto a substrate.  
     
     
         12 . An electrocoagulation printing apparatus according to  claim 11 , wherein the Ti alloy containing Al is the Ti alloy of  claim 1 .  
     
     
         13 . A method for producing a printed matter comprising the steps of: 
 a) providing a positive electrode having a surface composed of a Ti alloy containing Al and a plurality of negative electrodes;    b) providing an electrocoagulation printing ink between the positive electrode and the negative electrodes;    c) electrifying the positive electrode and selected ones of the negative electrodes to cause a coagulation of the ink on the surface of the positive electrode;    d) removing non-coagulated ink from the surface of the positive electrode to form an image on the surface of the positive electrode; and    e) transferring the image from the surface of the positive electrode onto a substrate to produce a printed matter.    
     
     
         14 . A method according to  claim 13 , wherein the Ti alloy containing Al is the Ti alloy of  claim 1.