ACF System

Pigment dyeing by Pad-Dry technique

What is ACF system?

AC (acabado/finish, color/colour)

This system allows simultaneous pigment dyeing and finishing with fastness results similar to even the best classical dyeing
Soft and smooth to handle

F (fácil/easy to use)

Easily applied with just some good padding and a stenter

How it works

  • The base is an acrylic polymer with a high percentage of reactive groups – very soft to touch
  • This polymer, thanks to being self cross-linkable and helped (eventually) by external cross-linking agents, forms a three- dimensional film
    On the fabric and on the micro-dispersed pigment
  • Thanks to this very soft film, the pigment is fixed on the substrate with high rubbing and cleaning fastness. Until now a conflictive issue in the application of pigments

Advantages

  1. Easy colouring on cotton fabrics and blends
  2. Same shade on the different fibres
  3. Minimum equipment requirement
    Good padding + stenter (possible IR pre-drying equipment       before entering stenter)
  4. Post-treatment or development (vat dye) not required
    Washing, oxidizing, soaping, etc.
  5. Ideal as ground dyeing for pigment printing
  6. Practically identical handling to the original. At the most, a slight increase in textile body mass without stiffness
  7. Compatible with high quality resins
    – wrinkle free
    – shrinking free
    – easy care, etc.
  8. Compatible with selected softeners.
    Selection necessary to avoid affecting rubbing fastness

Drying and curing

The ACF System may provide simultaneous drying and curing

  • Maintain low temperature in the first sections of the stenter. Maximum 120ºC. Curing conditions on the ACF System are relatively easy

30 sec. at 160ºC, once the fabric is dry

  • If ACF System is used together with high quality finish, it is convenient to dry in stenter and cure in a condensation (polymerization) machine

In this case: 4 – 5 minutes at 150 – 155ºC

Application Scope

  • Bedding  (sheets, pillow-cases, etc.)
  • Printing grounds
  • Curtains and roller blinds
  • Clothing garments
  • Camouflage fabrics
  • Lining fabrics
  • Glass-fibre

Fastness

Rubbing         Good fastness     in dry and wet
(pay attention to employed additives)
Washing         Good fastness     normal cleaning and dry-cleaning
Light                Unbeatable even in pale hues
(pay attention to selected pigments)
Chlorine         Excellent
Sweat               Excellent
Gas Fading    Very good

Bath preparation

  1. Temperature must be maintained below 30-35ºC in preparation baths
  2. Adjust pH from 5 – 5.5 with acetic acid
  3. Add products in the following order with an intermediate agitation:
    • Adratex ACF (P-816)
    • Adratint ACF (P-818)
    • Adranil ACF (P-814)
    • Adraprest ACF (P-811)
    • Next, add the necessary additives
    • Pigments
  4. Check pH and adjust if necessary
  5. Essential for deposits of preparation, pipes and padding to be free of any residues

Process

Impregnation:

  • Fabric must be well prepared with regular wetting and free of alkalinity (well neutralized)
  • Fabric must enter padding free of creases and tensions
  • Liquor level must be maintained at a constant level (feeding bath)
  • Top padding roller must have less hardness than inferior.
    Ideal 65º Shore on top and 75º Shore on inferior
  • Maximum pressure possible. Impregnation must be minimal
  • Ideally, pre-dry with infrared equipment before entering stenter to avoid migration. Residual moisture should be 25%

Defects ~ Causes (I)

Uneven dyeing

  • Low concentration of migration inhibitor agent (Adratint ACF)
  • Liquor pick-up too high due to low wringing pressure
  • Drying temperature or drying air pressure too high in the first sections  of the stenter

Change of shade.  Side-center-side

  • Uneven pressure on the padding.
  • Badly delivered pressures
  • Bad pre-treatment. Uneven hydrophility

Differences in long runs

  • Changes in ways of working
  • Bad pre-treatment
  • Drying temperature
  • Padding pressure
  • Pigment agglomeration in liquor

Defects ~ Causes (II)

Streakiness

  • Fabric tension too high
  • Low fabric opening at padding entrance
  • Bad pre-treatment

Spots

  • Light spots due to lack of antifoaming agent (Adratex ACF)
  • Dark spots due to low pigment dispersion (filter)

Roller or liquor deposits

  • Not enough build-up (Adratex ACF)
  • Fabric is not free of lint and naps (filter)
  • Rising of the liquor temperature (above 38ºC)

ACF System basic formulation

Product concentrations according to pigment quantity

Adraprest ACF (P-811) 80 120 150
Adratint ACF (P-818) 10 – 30 10 – 30 10 – 30
Adranil ACF (P-814) 4 6 8
Adratex ACF (P-816) 2 3 4
Pigment Adraprint 0 – 3 3 – 10 10 – 15

Units in g/l

ACF System + high quality finish (easy care)

Adraprest ACF (P-811) 80 – 120
Adratint ACF (P-818) 10 – 30
Adranil ACF (P-814) 4 – 8
Adratex ACF (P-816) 2- 4
Adraplast GM (P-506) 60
Adrasil EQ (P-786) 20- 40
Catalizador AC 18
Adraprint Pigment 0 – 15
Citric acid pH 4,5 – 5

Units in g/l

Basic compounds ACF System

Adraprest ACF (P-811)

  •   Acrylic dispersion with a very high degree of self cross-linking
  • Very small sized particles. High stability to sheering
  • Hardly any modification to touch
  • Forms a transparent film that does not yellow with temperature

Adranil ACF (P-814)

  • Very short polymer dispersion with high cross-linking capacity with any reactive     groups in the formulation

Adratex ACF (P-816)

  • Special wetting agent with no foam formation
  • Good antifoaming effect
  • Good dispersion effect. Acting as a build-up inhibitor agent while avoiding sheering     problems

Adratint ACF (P-818)

  • Oxiethylenated based migration inhibitor
  • Acting above 38ºC avoiding liquor migration on the textile caused by differences in     drying temperature

Additive compounds ACF System

Handling enhancer

  • Adrasil EQ    (P-786)
  • Adrasil TE-C (P-710)

Achieves easy care

  • Adraplast GM (P-506)
  • Adraplast VL  (P-509)
  • Catalizador AC

Body mass enhancer

  • Base Finish HQ (P-850)
  • Reticulante Finish HQ (P-851)

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