7000 SERIES - PHTHALATE-FREE PLASTISOLS
 
   
 
UNIFLEX 7000 Phthalate-free plastisol printing inks are 'press ready', exceptionally bright, high intensity inks. This system has an excellent soft handle, designed specifically for direct wet-on-wet printing on a wide range of natural and synthetic fabrics.

Properties
Medium opacity, lead free colours. Excellent wet-on-wet printability with extremely low 'pick up' on the underside of the screen. UF 7000 inks have a very smooth, creamy consistency and are fast flash curing at low temperatures resulting in matt to satin prints with excellent adhesion to most fabrics.

Applications
Printing of T-shirts, sweatshirts, Sport and Fashion Wear either directly or indirectly via transfers. Suitable for printing onto all natural fabrics and most synthetic fabrics. As with all plastisol inks, printing must be done with the 'off contact' or 'snap-off' technique.

Curing
As UF 7000 plastisols are solvent free, they will not air-dry, but must be 'flash cured' with indirect heat, to bring about partial or total cure.

Typical curing temperatures: -

  Conventional Oven
  150ºC (300ºF) 2-3 minutes
  Long/Medium Wave Infra-Red
  150ºC (300ºF) 45-90 seconds
  Short Wave Infra-Red
  150ºC (300ºF) 15-20 seconds

The figures quoted above should only be used as a guide, as various fabrics and colours require different curing conditions and are also dependent on the amount of ink printed onto the fabric i.e. darker colours cure faster than lighter colours. Curing conditions must be chosen to effect cure at maximum temperatures without scorching the fabric.

Flash Curing
Although UF 7000 plastisols can be printed 'wet-on-wet', intermediate drying of certain colours may be necessary in a multiple colour print in order to obtain optimum opacity, clarity and smoothness of the print. Flash curing or heat setting at low temperatures between colours can achieve this as follows: -

  Long/Medium Wave Infra-Red Flash Units
  700-800ºC (1000º-1100ºF) 2-5 seconds
  Short Wave Infra-Red Flash Units
  700-850ºC (1000º-1100ºF) 1-3 seconds
 

Additional factors also influence the dwell time (i.e. time spent under the flash unit) needed to flash cure a print, namely fabric and ink colour, amount of ink deposited and percentage coverage.

The optimum dwell time must be determined for each printing job, taking these variations into consideration.

To achieve the optimum dwell time and to improve production speeds, the following must be adjusted:- distance of the flash unit from the fabric's surface (as close as possible),hottest temperature and shortest duration without scorching the fabric.

Fastness
UF 7000 plastisols have excellent fastness properties provided that they have been cured effectively. Prints will pass the I.S.O. Test No.3 (60ºC) and DIN 54017 Wash Fastness Tests.

It must also be stressed that all fabrics must be prepared for printing (P.F.P) for optimum fastness properties.

Fibrillation
On certain fabrics, prints will display an apparent 'washed out' look, after being subjected to its first wash. This is due to a phenomenon called fibrillation, which is the result of the fibres of the fabric showing through the printed area. This effect can be avoided by selecting good quality fabric or by applying a heavier deposit of ink to matt-down the fibres on problematic fabric.

For these reasons, it is essential that all fabrics be adequately tested for fastness properties and the possibility of fibrillation prior to commencing production runs.

Screen Stencil Parameters
Solvent resistant or dual cure direct emulsions or capillary films are recommended.

Mesh selection will depend on the opacity, type of ink and handle required: -

High opacity 34 - 54T mesh
Soft handle 77 - 90T mesh
Metallic Glitters 15 - 21T mesh
Metallic Shimmers 24 - 43T mesh
Process Colours 90 - 140T mesh

Ink Coverage
Average coverage is in the region of 8 - 11 m²/lt through a 55T mesh screen. Variations can occur due to other factors such as mesh tension and count, off contact distance, squeegee durometer, etc.

 
     
 
 
 
 
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