Guidelines for using DigiPrime® 4431
DigiPrime® 4431 is a water-based product designed for flexographic application. In its liquid form it is very stable, with a shelf life of 12 months if stored unopened at moderate temperatures. DigiPrime® 4431 is capable of optimizing a wide variety of substrates including most films and papers.
Following application and drying, DigiPrime® 4431 coated substrates have excellent shelf life - in excess of a year. They will not yellow or show degradation of print quality or adhesion.
Substrate Selection Guide
| Substrates | Comments |
|
Papers
|
Films must have surface energy of 40 dynes/cm or more. Refresh corona is recommended. |
Storage of liquid DigiPrime® 4431
DigiPrime® 4431 must be protected from freezing. If frozen it is possible that grit or gels may be found in the product and it should not be used. Please store containers of the product above 5 °C.
Dilution
If required, it can be diluted with deionised or soft water. Dilution changes the viscosity and solids content of the product, which changes the applied coat weights and therefore the performance of the coated substrate. We do not recommend adding more than 20% by weight of deionised water.
Application
Cleaning
Flexoclean Engineering B.V.
Bliek 8
4940 AJ Raamsdonksveer
The Netherlands
Tel: +31 (0) 162 576222
Fax: +31 (0) 162 576220
E-mail: info@flexoclean.nl
URL: www.flexoclean.nl
or :
Danko Industries
181 Wolf Street
Unit C
Yorkville, IL 60560
USA
Tel: +1 630 882 6070
E-mail: ernie@dankoindustries.com
Coat weight
On most surfaces a target coating weight of 1-1.5 gsm wet is recommended; however, if the surface is absorbent and/or textured higher coat weights may be needed. This must be established by experimentation. Excessive coat weight may result in blocking in the wound roll. Typical anilox specifications and target coat weights are listed in the table below.
| Substrate | Target wet gsm | Anilox lines/inch | Anilox lines/cm | Cell volume bcm | Cell volume cc/m2 |
| Films | 1.0 | 400 | 160 | 3.9 | 6 |
| Uncoated Papers | 1.5 | 300 | 118 | 5.8 | 9 |
| Claycoated Papers | 1.0-1.5 | 400-300 | 160-118 | 3.9-5.8 | 6-9 |
To achieve sufficient wet-out on films it is very important that the surface energy be above 40 dynes/cm. Refresh corona treatment is recommended to obtain optimum wet out and full adhesion.
Drying
Be sure to cool the web down to less than 40 °C before winding or blocking in the wound roll occurs.
Checking the applied coat weight
Coat weight (gsm) x Length (m) x Width (m) = Consumption of DigiPrime (g)
Example: 1 wet gsm DigiPrime x 1000mLong x 0.300m wide = 300 grams used
Gravimetric method: Checking coat weight on plain films can be achieved by measuring the weight difference. You will need an accurate balance, as the dry coat weight is very low.
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