{"id":10688,"date":"2026-07-16T00:00:17","date_gmt":"2026-07-16T00:00:17","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=10688"},"modified":"2026-08-09T13:43:15","modified_gmt":"2026-08-09T13:43:15","slug":"label-ink-additives","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/ko\/label-ink-additives\/","title":{"rendered":"Label Ink Additives: Wetting, Foam & Blocking"},"content":{"rendered":"

Label ink additives<\/strong> must fit the facestock, print process, drying or cure, rewinding and conversion sequence. A film-wetting defect, press-loop foam and dry-label blocking require different experiments. Lock substrate treatment, viscosity, ink deposit and drying first, then change one additive route at a time.<\/p>\n

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Ink retracts on film<\/strong>
Screen the 2100 wetting grade after identity confirmation.<\/div>\n
Press loop builds foam<\/strong>
Screen 3062.<\/div>\n
Printed labels block<\/strong>
Gate 3501 by dose and protocol.<\/div><\/div>
Original label ink additive map: separate facestock entry, process air and dry-web handling.<\/figcaption><\/figure>\n

Define the complete label construction<\/h2>\n

Record paper or film facestock, topcoat, treatment, ink technology, overprint varnish, adhesive, liner and conversion route. Pressure-sensitive, shrink, in-mold and wet-glue labels do not share one acceptance protocol. Include die-cutting, matrix stripping, dispensing, seaming, shrinking or molding as applicable.<\/p>\n

Resolve the 2100 product identity<\/h2>\n

Longchang has two distinct live records for a similar 2100 wetting grade: one titled CHLUMIAG\u00ae 2100<\/a> and one titled CHLUMIWE\u00ae 2100<\/a>. The public site does not establish one unambiguous current brand identity. Require the exact commercial name, product code, TDS revision and COA before purchase or trial.<\/p>\n

Compare the available routes<\/h2>\n\n\n\n\n\n\n\n
\ub178\uc120<\/th>\nPublished evidence<\/th>\nFirst experiment<\/th>\nBoundary<\/th>\n<\/tr>\n<\/thead>\n
2100 wetting grade<\/td>\nTwo conflicting live identities; both pages state 0.1\u20131.0%, all three system types and flexible addition<\/td>\nRetraction, coverage and print laydown after exact identity confirmation<\/td>\nDo not assume which TDS or product data apply to the supplied lot<\/td>\n<\/tr>\n
CHLUMIAF\u00ae 3062<\/a><\/td>\n100% active; printing-ink dose 0.1\u20130.5%; water\/solvent\/UV<\/td>\nGrinding, pumping, chamber or return-loop foam<\/td>\nSolvent dilution requires stability and defoaming tests<\/td>\n<\/tr>\n
\ud074\ub8e8\ubbf8\uc544\uadf8\u00ae 3501<\/a><\/td>\nPrinting inks, inkjet, overprint varnish and release\/anti-sticking uses listed<\/td>\nSupplier-supported block or release study<\/td>\nNo public recommended dosage, active content or quantified block\/rub result<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Use the 2100 grade for measured film wetting<\/h2>\n

After confirming product identity, screen the supplier-approved dose only when ink beads, retracts or leaves irregular coverage on a verified facestock. Keep treatment, viscosity, anilox or screen, deposit and drying constant. Measure density, pinholes, line or dot quality, adhesion and overprint compatibility. Better spread does not prove stronger adhesion.<\/p>\n

Measure corona or plasma treatment immediately before printing and again after realistic facestock storage. Treatment decay, topcoat variation and surface contamination can change wetting independently of the ink. Include at least two representative facestock lots before approving a dose for production.<\/p>\n

Use 3062 for measured process air<\/h2>\n

Identify where air enters: dispersion, pump, chamber, return line or high-speed transfer. Screen within the documented 0.1\u20130.5% printing-ink range. Measure wet density, foam height and decay and cured pinholes. Reject a dose that lowers foam but creates craters, density loss, storage instability or poor rub.<\/p>\n

Keep 3501 behind a block-test gate<\/h2>\n

First exclude retained water or solvent, inadequate UV dose, warm rewinding, excessive roll hardness and high storage temperature. Then request 3501\u2019s current TDS, active content, starting dose and a reproducible pressure\/temperature\/time protocol. A public release application listing does not justify an invented equal-dose trial.<\/p>\n

Use a controlled label matrix<\/h2>\n\n\n\n\n\n\n\n\n
Trial<\/th>\nChange<\/th>\nPrimary measure<\/th>\nConversion gate<\/th>\n<\/tr>\n<\/thead>\n
A<\/td>\nUnchanged control<\/td>\nDensity, wetting, foam, drying and block baseline<\/td>\nAdhesion, rub and converting<\/td>\n<\/tr>\n
B\u2013D<\/td>\nConfirmed 2100 grade low\/mid\/high<\/td>\nCoverage, pinholes and print quality<\/td>\nAdhesion, OPV and lamination<\/td>\n<\/tr>\n
E\u2013G<\/td>\n3062 within 0.1\u20130.5%<\/td>\nWet density, foam and defects<\/td>\nDensity, rub and storage<\/td>\n<\/tr>\n
H\u2013J<\/td>\n3501 after data approval<\/td>\nBlock at fixed pressure, heat and dwell<\/td>\nCOF, rub, die-cut and dispensing<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Normalize density before ranking surface results<\/h2>\n

ASTM D7305<\/a> describes reflection-density measurement for printed paper, film or board. Match density before comparing rub, gloss or defects. Different ink transfer can imitate an additive effect. The method is not intended for metal or foil.<\/p>\n

Measure rub and blocking separately<\/h2>\n

ASTM D5264<\/a> provides a comparative Sutherland rub practice. Fix receptor, load, cycles and conditioning. Blocking requires a separate test matched to rewind or stack conditions. A surface route can improve block release yet worsen rub, overprint or adhesive-side set-off.<\/p>\n

Test the actual ink vehicle and process<\/h2>\n

ASTM D6687<\/a> guides testing of printing-ink vehicles and their components. Build the protocol around flexo, gravure, screen, offset or digital application as appropriate. Record press speed, drying or UV dose and observations through a full production-length run.<\/p>\n

Approve conversion and compliance<\/h2>\n

Run die-cutting, matrix removal, slitting, rewinding and dispensing on the final construction. For shrink or in-mold labels, reproduce heat or molding. None of the public pages proves food-contact, pharmaceutical-contact or low-migration compliance. Obtain relevant declarations and validate set-off and migration risk.<\/p>\n

Decision rules<\/h2>\n