Bad adhesion of surface ink

Phenomenon: packaging printing ink ink film (text) can be used to finger scratch, wipe (or adhesive tape stick down), after rubbing and rubbing, the ink film will fall, especially when the water is soaked for some time After drying, the ink film can still be degraded.

Reasons: 1 is the printing ink ink film is dry and crisp; 2 is no adhesion between the ink and the substrate (due to hydrogen bonding value is different); 3 is the content of the binder in the ink system is too small; 4 is the surface of the substrate Too smooth; 5 is the surface tension of the ink and the product imbalance is not good or paper absorption is too strong; 6 is the ink dryness is not good ... ....

Methods: 1 Add appropriate amount of natural rosin cheap, should adhere to the production of the test; 24 hours after the test, in the 25 test, adding thinning or bentonite to adjust the time; 2 stickiness (affecting adhesion fastness) problem, increase the amount Resins with low softening points, such as polyamide resins; 1% to 5% rosin added (addition of rosin in excess affects both dry speed and tends to stick back); TU-320 crosslinker added 0.2% to 0.5%; and added Tackifying resin; increase printing pressure; handle substrates well; choose printing inks that are both resistant to water and have a low softening point.

Poor adhesion of printing ink

Phenomenon: The ink is not problematic in pre-press proofing (or scraping), but it is peeled off after the printing is compounded.

Reasons: 1 is the ink system in the dispersant or wax-based anti-adhesive agent in excess; 2 is too much antistatic agent; 3 ink and substrate complexes do not correspond (with the wrong ink); 4 is the packaging printing ink ink film into The film is too early, resulting in a large amount of solvent is not completely evaporated (excess solvent residue); 5 is too thin ink, especially in the ink system, the content of the link is insufficient; 6 is the crystallization of the packaging printing ink (ie surface mirroring) is too smooth; 7 is The miscibility of ink and compound rubber is too poor. Note: When proofing (or scraping), using adhesive tape can not pull off, in the ink system contains anti-sticking slip agent is excessive, this stickiness can not only refer to the surface of the ink suspension antimony slip agent does not An illusion that the adhesive tape is miscible and cannot be removed. When the anti-sticking slip agent suspended on the surface of the ink film after printing is not miscible with the compound glue, proofing (scratching) does not come off, and a poorly compounded package fails to be printed. When the proofing (or scraping), the ink film is completely dried, no problem, but when compounded after printing, the residual amount of the solvent is evaporated again under a certain temperature condition, resulting in failure phenomenon of compounding, such as With the wrong ink or excessive dilution, the ink film is too thin and the composite fastness is poor; uneven or too thin coating adhesive is one of the root causes of poor compounding of the product.

Methods: 1 When the adhesion is not very good, add domestic petroleum resin; 2 can be added at any time TU-310 (crosslinker) adhesion promoter 0.1 ~ 0.3%. If the viscosity is not strong enough, the MP-45 or CEVA resin should be increased by 4% to 6% (solid) to improve its adhesion; 3 If the tensile pressure is not good after compounding, increase the CPP solution; 4 Select the surface Less glossy substrates; 5 Replace printing inks; 6 Add anti-slip agent to the ink.

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