Recommended Treatment Levels
The following chart offers general guidelines regarding the required surface treatment levels (as measured by the dyne test) for various process/material combinations. Please note it is critical that the appropriate specification is determined for each job, based on actual empirical results from functional finished product testing. The ranges shown here can be used to expedite surface analysis by suggesting a reasonable range within which to test. Blind reliance on this data will probably reduce your quality costs short term and ensure a large discrepant goods writeoff at some uncertain future date.
All data in dynes/cm (equivalent to mJ/m2)
In most cases, jobs can be run if the substrate at run-time is somewhere between the low and high dyne levels cited. For demanding runs (e.g., high web speeds and/or critical quality process work), it is safest to shoot for the top of the range. Use this chart as a general guideline only: each operation has slightly different requirements. These data are for flame or corona treatment in an oxygen-containing atmosphere.
(1) Some values theoretical.
(2) Any density, any type, including films, coated board, and molded products.
(3) All types; cast or molded.
(4) More plasticizer generally requires levels at the high end of these ranges.
(6) For heat sealing, the surface energies of the mating PE surfaces should match closely; if both faces are treated, heat sealing can usually be accomplished over a broader and lower temperature range.
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