De-foaming series series series . . De-foaming selection for the ink-tuning phase

VI. Key product recommendation - adjustment phase
ink in the actual printing of the deblistering effect mainly by the anti-foaming agent added in the ink-control phase -
grinding phase added de-foaming agent after strong grinding fully dispersed in the system, has been completely consumed, the ink-modulation phase no longer has a de-foaming effect
. Therefore, deboulants must be added in two stages, and even abrasive/ink-modulation-type de-foaming agents, such as TEGO® Foamex 842 and Foamex 810, cannot be added at once during the grinding or inking phase.
the selection of anti-foaming agent in the anti-ink phase is much more complicated and less regular than in the sanding stage
s
. Mainly because: At this stage, the deboist effect of deboist varies from system to system, but under the condition of full dispersion, the trend of compatible will not change. For example, it is not excluded that in
system, ®TEGO® Foamex 842 will have a worse defoaming effect than
TEGO®
Foamex 825. However
the ®of the TEGO 825 will certainly be better than
the ®TEGO 842.
above is Created in the water-related ink adjustment phase of the main recommendation:
(1) is generally the choice of better compatible desiccant, relative to the grinding phase.
(2) is generally recommended, emulsion type is 0.3-0.5%, concentrated type is 0.2-0.3%.
(3) can be based on the resin system preferably defocage agent products.
Water-based phenylpropyl system, general compatible is better, foam is more, so with a relatively strong defrosting agent;
(4) can be based on the viscosity of the system, and then preferably bubble suppression or bubble-breaking products. For example: when the viscosity is relatively high, the small bubble is relatively stable in the system, choose bubble-suppressing TEGO® Foamex 842®, Airex 901 W;
the following through practical application cases, detailed description of the characteristics of their products and applicable occasions. The first is concentrated products, the next section will introduce emulsion-type products.
1. TEGO® Foamex 843
(1)100% effective
(2) silicone, polymer hybrid desmoulizer
(3) foaming effect is excellent, especially suitable for ink
applications with low viscosity: low viscosity water-based flexible version Paper ink (phenylpropyl system), the printing process foam more and more
first of all, the ink defrosting agent primary, TEGO® Foamex 843, Foamex 810 performance is good
(Note: gonorrhea effect and compatible are rated at 1-5, 5 is the best, 1 is the worst). The
the addition of the defrosting agent is then adjusted and the storage experiment is carried out at 50
degrees C
week, after which the foam height and burst time (resting) are tested.
conclusion: TEGO® Foamex 843 is ideal for the system because of its highly consistent deblistering effect and efficiency after storage and before storage.
2. TEGO® Foamex 842
(1)
60% effective
(2) silicone solution desmoulizer (excluding hydrophobic air silicone)
(3) conforms to Swiss A and GB 9685, very strong foaming capacity, especially suitable for medium and high viscosity flexo ink.
(4) can be soluble in alcohols, especially suitable for alcohol-water-like inks. In addition to alcohol, it can also be diluted by the ether to obtain an average solution, diluted for easy storage, addition.
application case:
medium-high viscosity water-based flexible paper ink (phenylpropyl system), the original system using 0.25% silicone emulsion type (65% effective score) and 0.5% mineral oil desmoulant combination deblistering, but after a long period of printing, more and more bubbles in the cylinder, customers have been looking for a better
desmoulant.
conclusion: 0.2% TEGO® Foamex 842 deboulation effect to achieve the customer's original combination of de bubble agents.
application case: common medium and high viscosity offset online water-based glint oil (main resin is phenylpropan resin and emulsion), the system added a large number of sulfonate anion-based substrate moisturizer, foam is particularly stable, very difficult to eliminate
. : 0.3% TEGO® Foamex 842,
the film effect and foam height are significantly better than the market common competitors.
application case:
alcohol water-based cigarette packet ink (phenylpropylene system), because it contains a large number of alcohols, general foam is not much, but some systems will still encounter foam problems, the system because of the high compatible, so the desmoticizer selection is very limited, often difficult to choose to debobulation ability excellent, compatible products.
conclusion:
TEGO® Foamex 842 has a good de-foaming effect with
additions of 5 parts per 10,000 parts per 10,000 or less,
and is also very good due to its small additions and
.
,

® Foamex 842
has a strong deblication capacity, it is soluble in alcohols and compatible increases significantly as the alcohol content in the system increases.
3. TEGO® Airex 901 W
(1)
100% effective sub-
(2) silicone-concentrated deblister (silica containing hydrophobic gas)
(3) TE for adjustment phase GO
®
product line of the strongest debobbling agent, de-foaming capacity is super strong, add less, especially suitable for high viscosity of light oil or water-like mesh ink, but because of the strong de-foaming capacity, so it needs to pay attention to its compatible, recommended for compatible systems.
application case:
high viscosity offset printing online water-on-water polish, customers tried a very large number of market desolation products, or deblistering is not successful, foam is very stubborn.
: 0.2 per cent
TEGO ® Airex 901 W demonstrated superior de-foaming to successfully meet the app's de-foaming needs.