Solvent based ink

Yamamoto and Minamizaki [159] disclose the use of a curable silicone based release agent blended with resin particles which swell or are soluble in organic solvent. Coatings made with such blends can be written on with solvent based inks. For example, an addition cure silicone network containing 20 wt% 0.1 p,m diameter PMMA particles exhibited both good writeability (no ink dewetting and smear free) and a low release force of 10 g/cm for a PSA tape. 

Each pipe is rinsed with water in one of two rinse tanks and is then mounted on a wash rack and manually sprayed with water in a second rinsing operation. After the pipes dry, they are labeled with a solvent-based ink spray jet and protective plastic caps are hammered onto the ends. The finished products are stored outdoors until they are shipped to customers. 

Solvent-based inks, drying, 14 328 Solvent-based separations, design of, 20 745... 

Traditionally, evaporation-drying solvent-based inks have been used. These have been replaced during the last decade by UV curable inks, which exhibit the following advantages ... 

Clean Air Act Amendments. The CAA define the components of an ink formula that are regarded as volatile organic compounds (V OCs). Emissions from ink formulations during the printing process are still considered to be a significant source of air pollution. This regulation continues to be the principal impetus to the introduction of ink technologies that offer alternatives to traditional solvent-based ink chemistries. 

Solvent dyes for solvent based ink-jet inks and hot melt ink-jet systems are selected 1 2 chromium or cobalt complex azo (C.I. Solvent Yellow 83 1 [61116-27-6], C.I. Solvent Red 91 [61901-92-6]), anthraquinone (C.I. Solvent Blue 45 [37229-23-5]), or phthalocyanine (C.I. Solvent Blue 44 [61725-69-7]) dyes. 

At present, the most important technical objective for the flexographic process is to reduce or eliminate the use of inks based on organic solvent. The research is directed mainly towards improving water-based inks but several reports on the use of UV-cured inks have been published. For applications in which no alternative to solvent-based inks is available at present the trend is towards eliminating hydrocarbon solvents. 

Surface treatments are often necessary for aesthetic and performance reasons. This can involve printing or lacquering, using both solvent and non-solvent based inks, which are applied to the surface using rollers, pads, silk screen, inkjet or lasers. Waterborne coatings are environmentally more desirable and silicone surfactants are claimed to give the best performance to improve substrate wetting (456). 

For an in-depth understanding of the formulation of solvent inks for CIJ printers, we need to look at how CIJ technology works, the product applications and the history of ink formulation within the CIJ technology area. Although there are a few aqueous formulations used in CIJ printers, the vast majority of inks are indeed solvent-based, even if they are solvent/water or solvent/UV inks. Thus, solvent inks form the backbone of this industry and there are literally hundreds of unique solvent-based ink formulations being sold and used each day. 

There are tiiree possible approaches to elimination of solvent emission 1. incineration of solvents emitted from solvent-based inks ... 

These inks contain high concentrations of low-boiling solvents, and the usual practice is to dilute them further in the press room. The large volume of solvents emitted makes incineration impractical, but these solvents may be absorbed on activated charcoal, and removed l steam distillation when the charcoal is saturated. The recovered solvents may be re-used or sold however, it may be impractical to fractionate some recovered solvent blend that boil in the same temperature range, which lessens their value considerably. Therefore, although this approach is also technically and economically feasible, the difficulty in procuring the solvents used for dilution may restrict the continued use of these solvent-based inks and, hence, the adoption of solvent recovery approach. 

Inevitably, the cost of ultraviolet light-cured inks is higher than that of the conventional solvent-based inks they are designed to replace. 

Use To remove all solvent based inks from screen after printing, leaving film stencil intact. 

Drop-on-demand printers have an array of nozzles which fire a drop of ink when commanded by their computer control. Can use either a solvent-based ink or a solid base which is melted and ejected by the print-head. 

Any decoration is usually done flexographically and currently uses solvent-based inks to improve drying. Delivery is usually of made-up cases in the flat, stacked onto pallets and either stretchwrapped or banded. 

Gravure acid flexographic inks have been conventionally based on solvents, particularly as the materials printed by these processes have typically been non-absorbent (i.e. foil, plastics). Solvents which are considered hazardous if inhaled include benzene, methanol, methyl and ethyl cellulose, hence these are no longer employed. A typical solvent based ink contains ... 

The most common inkjet inks are water based, containing either dyes (low cost but prone to fading in the images) or dispersed pigments (more expensive but more permanent images). Some commercial/industrial inkjet inks use solvent-based inks containing dispersed pigments. 

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