Stretch-exposed dispersion
The blown bubble stretches film thin, exposing any agglomerate as a speck or gel, so ultra-fine dispersion is essential.
Applications
Pigments for Blown Film
Pigment recommendations for blown film with technical checks and export enquiry support.
Blown film extrusion inflates a molten tube into thin film for bags, liners and packaging, combining thin gauges with biaxial stretch that ruthlessly exposes poor dispersion as specks, gels and streaks. Organic pigments must disperse extremely fine, survive the extrusion melt, and, in flexible polyethylene film, resist migration and blooming. Buyers should confirm gel-free, speck-free dispersion at the running gauge, low-migration grades for packaging that contacts goods, heat stability matched to the resin, and, for pigmented films that must not block, freedom from any surface tack or bloom.
At a glance
What Pigments for Blown Film covers
Gel and streak freedom
Poorly dispersed pigment causes gels and streak lines in the bubble; quality masterbatch keeps blown film clean and uniform.
Low migration flexibles
Flexible polyethylene bags let pigment migrate, so use non-blooming grades that will not transfer to contents or block wound layers.
Resin-matched heat rating
Confirm the pigment survives the polyethylene extrusion melt without shade shift so blown film colour stays consistent through the run.
Recommended pigments
High-demand grades to consider
A starting shortlist of export-grade organic pigments relevant to Pigments for Blown Film. Open any grade for shade, fastness and packing detail, or send your requirement for a matched recommendation.
Pigment Pastes
Water Based Pigment Paste
Water Based PasteWater-dispersible pigment paste for coatings and textile systems.
View export grade Yellow PigmentsPigment Yellow 13
PY13Bright green-shade yellow for offset ink and coating applications.
View export grade Red PigmentsPigment Red 122
PR122Quinacridone magenta for high-performance paints and polymers.
View export grade Pigment PastesFRP Pigment Paste
FRP PasteReady-to-use paste for fiberglass, FRP panels, and composites.
View export grade Blue PigmentsPhthalocyanine Blue Alpha
Pigment Blue 15:1Red-shade alpha blue with dependable dispersion for inks and coatings.
View export gradeExplore more
Related pages & export hub
Answers
Pigments for Blown Film — frequently asked questions
How does the blown film process expose pigment defects?
The molten tube is inflated and stretched biaxially into thin film, thinning any pigment agglomerate into a visible speck, gel or streak. This makes blown film especially unforgiving of poor dispersion. High-quality, finely dispersed pigment, typically via masterbatch, is needed to run clean, defect-free film.
Why choose low-migration pigments for blown polyethylene bags?
Blown film is usually flexible polyethylene made into bags and liners that contact goods and are wound on rolls. Migrating pigment can bloom to the surface, transfer to contents, or cause layers to mark each other. Low-migration grades keep colour locked in the film and prevent contamination.
What causes streaks in coloured blown film?
Streaks usually come from inadequately dispersed pigment or uneven masterbatch mixing, showing as lines running with the film. Good masterbatch, correct let-down ratio and proper screw mixing prevent them. In blown film the stretch amplifies any unevenness, so dispersion consistency directly determines a streak-free appearance.
Is blown film pigment selection different from cast film?
Requirements overlap strongly, fine dispersion, heat stability and low migration matter for both. Blown film's biaxial stretch and bubble stability make it particularly sensitive to gels and specks, so dispersion quality is emphasised even more. Otherwise the same pigment selection logic applies to both film routes.
Buyer knowledge base
Pigments for Blown Film: a quick sourcing guide
How professional buyers de-risk a pigment purchase: sampling, fastness verification, documentation and clear commercial terms.
Shade matching
Target a physical standard or current reference; the lab confirms undertone and tinting strength.
Migration control
For plasticised and polyolefin systems, grades are chosen to resist blooming and plate-out.
Compliance on file
REACH and RoHS declarations and correct HS codes prepared for your market's customs.
Trial then commit
Approve shade, strength and dispersion on a sample before any production quantity.