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Press-Chemistry

The difference : Aromatic or Aliphatic?

Aromatic washes are more aggressive in their cleaning and have more associated hazards than Aliphatic washes. Aromatic chemicals certainly have their place but, where alternatives are available they are rapidly being replaced with Aliphatic chemistry.

Of importance is the chemical structure of these two categories, Aromatics have a ring structure and Aliphatics are long chains of carbon atoms. The behaviour of each category is very different. The relatively small size of the aromatic particle allows it to penetrate quickly and deeply into rubber rollers and blankets and also into biological systems (such as skin). Therefore more care is required on use, as these products have an increased hazard potential.




Ink & Varnish

High speed and long perfecting presses

Printing presses can be extremely productive; to ensure optimum productivity and print quality Vina Tam inks are highly pigmented ensuring excellent graphic reproduction and press performance.


Print buyers are seeking that their work is printed up to standard - or just to be affortable. Number One Inks fill the gap between.

Affordable and up to standard.



About Offset printing inks - how they are formulated

Inks for sheetfed as well as inks for heatset web offset printing are structured lithographic paste inks and generally consist of a varnish, pigment and extender, mineral oil distillate, vegetable oil and additives.




Ink composition


Varnish

The varnish is the binding agent and consists of hard resins, chemically modified wood resin and synthetic hydrocarbon resin, soft alkyd resin and a mix of vegetable oil and mineral oil distillates. The mix is cooked to dissolve and disperse the hard resin, thus forming a homogeneous varnish.


Pigments

The colorants in the inks are synthetic organic pigments, not to be confused with natural pigment or with dyes. For black ink, carbon black is used as the pigment. The amount of pigment and extenders (chalk/clay) depends on the desired colour and structure of the ink.


Mineral oil distillate and vegetable oil

Sheetfed inks are designed for drying by oxidation (skinning). Certain vegetable oils harden under the influence of oxygen from the surrounding air. The most commonly used type is linseed oil. A dryer catalyst accelerates the drying process.

For the heatset printing process it is necessary to use a diluent that can be evaporated in a hot air dryer. For this reason, a fraction or distillate of mineral oil with a boiling range of 240–290 °C is used. The function of this diluent is to act as a “carrier” for the resins and pigments and to allow the final formation of an ink film of about 1 micron thickness on paper.


Additives

Certain additives are used for the pigment grinding process or to provide specific ink properties which have an effect on the lithographic behaviour of the ink on press. Waxes are used to improve the rub resistance and slip properties of the dried ink film.

In sheetfed inks certain agents are used to create an appropriate balance between the drying properties of the printed ink film and the skinning tendency of the ink surface in an open can or ink duct.



Waterbased Coatings (DSC, Weilburger Graphics)


Our coatings offer a wide range of clear coatings designed to perform on your specific application equipment. Including Security applications. Our experience and knowledge of polymer formulation and coating machinery ensures that you benefit from the latest innovative developments, which can be practically applied by your coating equipment.


Vina Tâm serve all your coatings needs from highest gloss to full matt finishes, functional barrier coatings, and products which display specific resistance performance. If you need to solve a particular coating problem, or enhance the performance of your existing coated materials, then please Contact us