“......What is Plastisol!!??”
Plastisol is an 'oil based' system of PVC's, plasticizers and pigments.
Does not contain any solvents.
Plastisols are non flammable, non toxic and non hazardous. It has been used in general industry for various applications such as bottle closures, underbody sealants, children's soft 'plastic' toys, wall paper, tarpaulins, synthetic vinyl leather, shoes, interior vehicle panelling, food packaging, etc…
Curing takes place when the PVC absorbs the plasticizer and swells to form a continuous film (gelling) with the application of heat.
  “......What are the advantages of using Plastisol printing inks!!??”
As it is a solvent free system, the ink does not dry in the screen.
Can be printed through high (fine) mesh counts - even when printing on dark backgrounds.
Sits on 'top' of the substrate therefore less ink is needed.
Fast flashing
Can be printed 'wet on wet' which means less downtime and therefore higher production yield.
Low in VOC's which creates a more pleasant printing environment.
Can be printed on paper and be transferred with a heat press.
Excellent stretch for sports fabrics and low bleed for intense coloured dyed fabrics.
  “......Are there disadvantages!!??”
The print cannot be ironed directly
Is not water soluble
  "…..I thought Plastisol was environment unfriendly !!??"
  This is a popular belief, but false!
As Plastisol does not contain any solvents, heavy metals (Lead, Mercury, etc…), Formaldehyde or VOC's, nothing “Ozone depleting” is released into the atmosphere during printing and curing.
Secondly, as Plastisol inks are not water soluble, any residue ink on the screens, squeegees, containers and utensils is not washed into the drain, unlike water based inks, but is cleaned with recyclable low volatile solvent units - using Mineral Turpentine or White Spirits commonly used to clean paint brushes. This is obviously far less pollutant to the sewerage systems.
  "…..but Plastisol is so expensive compared to what I'm using!!??"
Even though plastisol is more expensive than conventional water based systems kilogram for kilogram, it is more economical per unit as a result of:-
  Less downtime...
No air drying... No stopping for blocked screens.
No evaporation... No darkening of colours as experienced with water based systems.
  Less ink used...
No air drying... No stopping for blocked screens.
No evaporation... No darkening of colours as experienced with water based systems.
Higher mesh counts can be used without the screens blocking, therefore less ink.
Because plastisol 'sits on top' of the fabric, unlike water based systems where the ink penetrates the fabric, less print strokes are required (mostly single stroke)….therefore less ink is consumed.
All surplus ink on the screens can be re-used later as plastisol does not form a “skin” - normally caused by air drying - which means no ink is thrown away.
  Faster production speeds...
Due to reduced downtime and reduced print strokes the production yield is automatically increased.
With plastisol you can increase both the flood and print speeds - unlike water based systems where you have to 'wait' during the print stroke for the inks to penetrate.
When printing on dark garments only the underbase white needs to be gelled (under 2 seconds) and the remainder of the colours can be printed 'wet on wet', whereas with water based systems each colour has to be fully cured !!
Curing can be achieved in an oven less that 2 metres long in under 20 seconds...... as the ink layer only needs to reach a temperature of 150°C / 300°F to cure - compared to water based systems where long, slow ovens are used.
The curing of Plastisol is not only faster but it uses less electricity and omits less VOC's.