ND Industry

Dyne Level Measurement TECHNICAL INSTRUCTION ON HOW TO USE SURFACE TENSION / WET ABILITY TESTEROBJECTIVE OF TESTWetting test as measured by this test show treatment level achieved by the surface of plastic film or substrate, which has been treated electrically or other means [or wet ability of non treated surface] to get satisfactory print or coating adhesion or anchoringThis quality control test, is highly recommended for printing Coating and plastic blow molding industriesEach test fluid gives an accurate means of surface tension level in terms of dynes/cms when applied to the surface to be tested Test procedureLay the specimen to be tested on a clean flat surface with treated side on the top transparent films should be kept on the top of white paper for better visibility of marking spread the test fluid or ink from the felt tip of test pen lightly over an area of 7 cms² of the test specimen (i.e. strip of 7 cams x 1cms). Note time taken for continuous film on ink to break into droplets. And not peripheral shrinkage. (border shrinkage ).Wetting is satisfactory or adequate ,when a continuous film of test fluid remains intact 3 seconds or more on the substrate to be tested .breaking of the ink film into droplets, in less than 3 seconds indicate a lack of wetting and a lower numbered test fluid to be tried. if the ink film remains intact for more than 3 seconds . The surface tension of this ink in dynes/cm “wetting tension” and these values are already marked on each of these pens/bottles.Please note that observations of the liquid film behavior should be made in the center of the liquid film. Shrinkage of the liquid film on the edges of the applied ink does not necessarily indicate a lack of wetting. Breaking of liquid film into droplets within 2 seconds, indicate lack of wetting this is especially true for substrate having treatment level above - 40 dynes cams ²Some experience with this will give excellent insight, to enable an accurate reading to be made. Extreme care must be ensure the film or substrate is not touched or contaminated in the area of lest.It is recommended that when testing is done during the production, the test fluid or ink to be applied across the full web width. QUALITATIVE RATINGS OF TREATMENT LEVEL OR WETTABILITY  Sr. No.Treatment level in Dynes/cmExpected quality rating in terms of print or coating Adhesion / anchorine1Below  32 Very poor printing or coating adhesion.2 34Poor printing or coating adhesio3 36Fairly good printing or coating adhesion.4 38Good printing or coating adhesion.5 40Very good printing or coating adhesion.6

Dyne Level Measurement
TECHNICAL INSTRUCTION ON HOW TO USE SURFACE TENSION / WET ABILITY TESTER
OBJECTIVE OF TEST
Wetting test as measured by this test show treatment level achieved by the surface of plastic film or substrate, which has been treated electrically or other means [or wet ability of non treated surface] to get satisfactory print or coating adhesion or anchoring
This quality control test, is highly recommended for printing Coating and plastic blow molding industries
Each test fluid gives an accurate means of surface tension level in terms of dynes/cms when applied to the surface to be tested
 
Test procedure
Lay the specimen to be tested on a clean flat surface with treated side on the top transparent films should be kept on the top of white paper for better visibility of marking spread the test fluid or ink from the felt tip of test pen lightly over an area of 7 cms² of the test specimen (i.e. strip of 7 cams x 1cms). Note time taken for continuous film on ink to break into droplets. And not peripheral shrinkage. (border shrinkage ).
Wetting is satisfactory or adequate ,when a continuous film of test fluid remains intact 3 seconds or more on the substrate to be tested .breaking of the ink film into droplets, in less than 3 seconds indicate a lack of wetting and a lower numbered test fluid to be tried. if the ink film remains intact for more than 3 seconds . The surface tension of this ink in dynes/cm “wetting tension” and these values are already marked on each of these pens/bottles.
Please note that observations of the liquid film behavior should be made in the center of the liquid film. Shrinkage of the liquid film on the edges of the applied ink does not necessarily indicate a lack of wetting. Breaking of liquid film into droplets within 2 seconds, indicate lack of wetting this is especially true for substrate having treatment level above - 40 dynes cams ²
Some experience with this will give excellent insight, to enable an accurate reading to be made. Extreme care must be ensure the film or substrate is not touched or contaminated in the area of lest.
It is recommended that when testing is done during the production, the test fluid or ink to be applied across the full web width. 
QUALITATIVE RATINGS OF TREATMENT LEVEL OR WETTABILITY
 
 
Sr. No.Treatment level 
in Dynes/cmExpected quality rating in terms of print or coating Adhesion / anchorine
1Below  32 Very poor printing or coating adhesion.
2 34Poor printing or coating adhesio
3 36Fairly good printing or coating adhesion.
4 38Good printing or coating adhesion.
5 40Very good printing or coating adhesion.6 
Special instructions to avoid erroneous readings:
 
This is a delicate test, users should observe following instructions carefully otherwise the test result will be erratic/inconclusive or users may conclude that the TESTER is faulty.
Erratic of inconclusive readings are observed under following testing conditions :
Inconsistent (corona) treatment on the substrate may result in erratic readings.
Loss of treatment or surface wetting tension due to repeated winding/unwinding of the material or due to friction on the machine may give erratic readings.
Contamination due to dust or frequent handling of the treated material may also give erratic or inconclusive results. Therefore it is advisable to perform  test on fresh (untouched) samples.
Insufficient fluid (test ink) in the working pens, insufficient fluid at the tips of the pens. Resulting in error. Therefore if testing is done after a long gap,