Film extrusion plants running high-burst-strength liners for bulk chemical and mineral packaging select a 2.0 g/10 min virgin LLDPE for its balance between melt strength and drawdown across a 2.0:1–2.5:1 blow-up ratio. On a 450 mm three-layer blown-film die with 2.4 mm die gap, melt temperature at the adapter is maintained at 215–225 °C, and screw back-pressure is held at 250–320 bar. Slip-antiblock masterbatch is metered at 1.2–1.8 wt%, and a fluoropolymer processing aid is added at 500–800 ppm to prevent die-lip buildup during 72-hour continuous runs. Industry compliance for non-food industrial liners is governed by REACH and RoHS; where the liner is converted as an inner ply for food-contact bulk packaging, FDA 21 CFR 177.1520(c) 3.2a applies. Downstream converting uses bottom-seal and side-gusset forming on rotary heat-seal equipment with dwell times of 1.2–1.8 s at 135–155 °C. Terminal product types include FIBC inner liners, drum liners, steel coil covers, pallet shrouds, and construction films.

When a 2.0 g/10 min LLDPE is processed on a three-layer cast-film line with a 0.6–0.8 mm slot gap and a chill roll maintained at 22–26 °C, the melt index permits stable drawdown at line speeds between 300 m/min and 350 m/min. In the outer layers, a polyisobutylene-based tackifier masterbatch is metered at 1.0–2.5 wt%, and a silica antiblock concentrate is added at 0.3–0.8 wt%; the core layer remains 100% virgin resin to preserve elongation and tear resistance. Friction and cling are controlled to 0.25–0.45 µ static and 0.20–0.35 µ dynamic per ASTM D1894, while elongation at break is measured according to ASTM D882. REACH and RoHS govern industrial pallet-wrap applications; for food-contact stretch overwrap on fresh-cut produce trays, FDA 21 CFR 177.1520(c) 3.1a and EU Regulation No 10/2011 are applied, with overall migration limited to 10 mg/dm². Downstream equipment includes edge-pinning systems, vacuum boxes, and oscillating haul-off to flatten gauge bands before conversion into 12–30 µm hand pallet wrap, machine wrap, pre-stretched rolls, and bundling film.

What Changes When a 2.0 g/10 min LLDPE Replaces EVA in Silage Wrap?

Replacement of EVA with a 2.0 g/10 min LLDPE in silage bale wrap shifts the film’s elongation behavior from high-tack cohesive failure to controlled plastic deformation, requiring adjustment of prestretch depth from 55% to 65–75% to avoid neck-in and edge tear. The formulation is compounded with a hindered amine light stabilizer masterbatch at 3–6 wt% depending on UV exposure class and a carbon-black masterbatch at 2–4 wt% for black mulch-grade film; the tackifier addition is reduced to 1–2 wt% when compared with EVA blends because LLDPE cling is generated mainly at the cast-film surface layer. EN 13206:2017 specifies tensile and elongation requirements for thermoplastic bale-wrap films, while ISO 527-3 covers tensile testing of film specimens; migration limits under EU Regulation No 10/2011 are not applicable to silage wrap unless the film is subsequently used for wrapped feed bales that may transfer substances. Production is conducted on cast-film equipment with a slot die temperature of 260–280 °C and a chilled roll at 20–25 °C, followed by edge trimming and core cutting into 25 µm and 35 µm rolls. Terminal product types include round bale silage wrap, square bale sleeve film, and temporary silage pit covers.

Sealant-Web Extrusion Across Aluminum Foil and PET Laminates

In flexible packaging laminates, a film-grade 2.0 g/10 min LLDPE provides a heat-seal initiation range of 95–110 °C at 40 psi sealing pressure and 0.5–1.0 s dwell, with hot-tack retention sufficient for vertical form-fill-seal filling of 1 kg pouches. The sealant web is coextruded as a 20–50 µm layer and dry-blended with an erucamide slip masterbatch at 1.0–1.5 wt% and a synthetic silica antiblock masterbatch at 0.8–1.2 wt%; the slip additive reduces coefficient of friction to 0.15–0.25 µ after 48 hours aging per ASTM D1894, while the antiblock prevents blocking at roll-stock tension up to 1.2 N/mm. FDA 21 CFR 177.1520(c) 3.1a covers olefin polymers in food-contact film, and EU Regulation No 10/2011 requires overall migration below 10 mg/dm²; lamination adhesives must be selected from the appropriate FDA or EU positive lists because direct resin compliance does not extend to the finished laminate. Downstream conversion uses a two-component solventless adhesive lamination line running at 180–220 m/min, followed by curing for 48–72 hours at 35–40 °C before slitting. Terminal product types include stand-up pouches, three-side-seal sachets, stick packs, and lidding film for dairy cups.

On vertical form-fill-seal lines packaging IQF vegetables at cold-storage temperatures of -30 °C, the 2.0 g/10 min LLDPE is coextruded into 60–80 µm blown film with a 2.5:1 blow-up ratio and frost-line height of 500–700 mm. The resin is blended with 10–20 wt% metallocene-catalyzed LLDPE to raise low-temperature dart impact and with an erucamide slip masterbatch at 500–1,000 ppm to control film-to-metal friction on filling tubes. Compliance for frozen-food contact includes FDA 21 CFR 177.1520(c) 3.2a and EU Regulation No 10/2011; extraction testing per 21 CFR 177.1520(d) may be required for fatty foods at room temperature, whereas frozen-food packaging typically falls under lower migration conditions. Downstream equipment includes three-layer blown-film dies, internal bubble cooling with chilled air at 8–12 °C, and gravity-fed form-fill-seal machines with sealing jaw temperatures of 140–160 °C. Terminal product types include pillow bags for green peas and corn kernels, bakery freezer bags, seafood pouches, and bag-in-box liners for ice slurry distribution.

When Low Gel Counts Dictate Air Pillow Film Yield

Air cushion film for void-fill and light-blocking protective packaging operates with a tight processing window at seal temperatures of 150–165 °C and dwell times of 0.3–0.6 s; gels above 200 µm may cause instant seal failure across the longitudinal seal bar. A 2.0 g/10 min virgin LLDPE is extruded on a cast-film line with a 0.5–0.7 mm slot gap and a chill roll at 18–24 °C, then slit into rolls of 20–40 µm thickness. Formulation addition includes a silica antiblock masterbatch at 0.1–0.3 wt% and an erucamide slip masterbatch at 0.1–0.3 wt%; higher slip loadings above 0.5 wt% are avoided because they lower seal strength when residual additive migrates to the seal interface. Compliance for general cushioning is governed by REACH and RoHS; where cushioning is used as a direct food-contact insert for shipped produce, FDA 21 CFR 177.1520(c) 3.1a applies, but converters must verify that finished pillow machines maintain seal-bar temperature tolerances within ±2 °C to avoid localized seal thinning. Downstream conversion is performed on air-pillow machines with heated roller sealing and inflation pressures between 0.4 bar and 0.8 bar. Terminal product types include air pillows, void-fill cushions, and interleaving films for bag-in-box wine shippers.