In blown film operations producing heavy-duty shipping sacks, industrial liners, and heat-sealed carrier bags, Bapolene 152P enters the feed throat as a pellet blend with a long-chain-branched LDPE. The LDPE addition is normally maintained between 15 wt% and 30 wt%, because the hexene LLDPE alone exhibits lower melt tension than LDPE and can produce bubble flutter on high-output dies. On a grooved-feed extruder with L/D 30:1–32:1 and a barrier screw designed for LLDPE, melt temperature is held at 200 °C–220 °C, and the die gap is set at 1.8–2.4 mm to limit melt fracture. A blow-up ratio of 2.2:1–2.8:1 and a frost line height 6–9 die diameters above the air ring are commonly used for 40–80 μm film. The hexene short-chain branching pattern raises the dart impact and Elmendorf tear of the film relative to a butene LLDPE of similar melt index and density; however, downgauging below 30 μm without raising the LDPE fraction to at least 20 wt% can cause bubble instability at line speeds above 60 m/min. Tensile properties are measured according to ASTM D882-18 or ISO 527-3:2018, dart impact according to ASTM D1709-16 Method A, and Elmendorf tear according to ASTM D1922-15 or ISO 6383-2:2015. For non-food industrial sacking, REACH SVHC reporting applies above 0.1 wt% per substance. When the same sack is intended for dry food contact, the finished monolayer must satisfy the extractives and end-use limits in FDA 21 CFR 177.1520(c) and the overall migration limit of 10 mg/dm² under Regulation (EU) No 10/2011. Failure modes observed on production lines include die-lip buildup from oxidized regrind and gauge bands caused by air-ring turbulence; both are reduced by keeping total recycled content at or below 25 wt% and by using an internal bubble cooling system. The end product is a finished sack or liner with side gussets and punched handle holes, typically heat-sealed at 140 °C–160 °C jaw temperature.

Representative 40 μm blown film property ranges for 0.918 g/cm³ hexene LLDPE blended with LDPE; not product-specific and not a sales specification.

LDPE addition (wt%)	Dart impact Method A (ASTM D1709-16) (g)	Elmendorf tear MD (ASTM D1922-15) (N/mm)	Elmendorf tear TD (ASTM D1922-15) (N/mm)
0	120–160	12–15	14–18
15	110–140	11–14	14–17
20	100–130	10–13	13–16
30	90–120	9–12	13–16

What Changes in Cast Stretch Film When Hexene LLDPE 152P Is Used with Edge Trim Recovery?

In cast stretch film production for pallet unitization, the shift to a hexene LLDPE affects the balance between stretch force, cling, puncture, and gauge uniformity differently than in blown film. Bapolene 152P is extruded on a slot-die line with a 0.6–0.8 mm die gap and a melt temperature of 240 °C–260 °C, with the primary chill roll held at 15 °C–25 °C. The resin is often dry-blended with 10–20 wt% of a metallocene LLDPE or an ethylene-vinyl acetate copolymer containing 12–18 mol% vinyl acetate to adjust cling and puncture. Edge trim recovery is direct: because cast film edge trim is chopped and returned to the extruder, the resin must tolerate repeated shear and heat history. In practice, hexene LLDPE grades of this class do not generate excessive gel when regrind is kept at or below 30 wt% of the feed, provided the recyclate stream passes through a melt filter with 100–150 μm screens. Above 30 wt% regrind, stretch force measured at 200% elongation may increase, and gauge bands can develop if the melt pressure fluctuates. The water-fall edge encapsulation system is preferred because it keeps edge trim free of processing oils and dust. Cling is measured according to ASTM D5458-95(2020), puncture resistance according to ASTM D5748-19, and tensile stretch force according to ASTM D882-18. The film is typically down-gauged to 12–20 μm in machine wrap and 20–35 μm in hand wrap, with pre-stretch ratios in application equipment commonly limited to 200–250% for this type of hexene LLDPE blend. Published data for Bapolene 152P-specific cast performance is limited; the processing envelope above is taken from general hexene LLDPE extrusion grades of similar melt index and density. The end products are pallet-wrapping films with differential slip or one-sided cling, and the operational boundary is the onset of draw resonance at line speeds above approximately 600 m/min unless a small LDPE fraction is added to improve melt strength.

Extrusion Coating of Woven Polypropylene and Kraft Paper for Industrial Flexible Packaging

Extrusion coating with Bapolene 152P requires a different set of conditions from cast film because of the drawdown length between the die exit and the substrate nip. The melt temperature is raised to 285 °C–305 °C to promote oxidation and adhesion to primed surfaces, and the die gap is held at 0.5–0.8 mm. The resin is normally blended with 20–30 wt% LDPE to increase neck-in stability and reduce draw resonance; without that modification, the low melt tension of the hexene LLDPE produces excessive neck-in at air gaps above 120 mm. The extruder is typically a single-screw machine with L/D 28:1–32:1 and a compression ratio near 2.5:1. The air gap is maintained at 100–180 mm, and the substrate is either corona-treated woven polypropylene or a kraft paper with a pre-applied primer. The coating weight is set between 15 g/m² and 25 g/m² for woven PP sacks, and between 20 g/m² and 40 g/m² for multi-wall kraft constructions requiring a moisture barrier. When direct adhesion to an unprimed or low-dyne woven PP substrate is insufficient, a coextrudable tie layer or an ozone treatment is interposed; this is a known operational boundary rather than a fault of the resin. End-use compliance for packaging of dry food or industrial powders follows FDA 21 CFR 177.1520(c) for the olefin layer, and the overall migration limit in Regulation (EU) No 10/2011 is 10 mg/dm². The finished structures are woven polypropylene outer bags with a heat-sealable LLDPE inner coating, or multi-wall paper sacks with an outer moisture barrier. Heat seal strength is commonly evaluated by ASTM F88/F88M-21 on 25 mm strips after sealing at 160 °C–180 °C jaw temperature. The primary production failure is pinholing when coating weight is below 15 g/m² on low-basis-weight substrates; raising the melt temperature above 310 °C causes odor and degradation of the hexene LLDPE. Therefore, the process window is 285 °C–305 °C and must be controlled within ±10 °C to avoid both adhesion loss and off-gassing.

Compliance matrix for converted articles containing Bapolene 152P in flexible packaging applications.

Regulation/Standard	Scope	Key Value/Condition
FDA 21 CFR 177.1520(c)	Olefin polymers for food contact	Subject to extractives and intended-use conditions
Regulation (EU) No 10/2011	Plastics in food contact	Overall migration 10 mg/dm²
REACH Article 33 / Annex XVII	SVHC reporting and restriction	0.1 wt% per SVHC threshold
ASTM D1238-20 / ISO 1133-1:2022	Melt-flow verification	190 °C/2.16 kg

When Silage Film Needs a 2.2:1 Blow-Up Ratio Without Sacrificing Dart Impact

In agricultural bale-wrap and silage cover film, Bapolene 152P is processed on a blown film line with a die gap of 1.6–2.2 mm and a blow-up ratio of 2.2:1–2.5:1. The melt temperature is kept at 205 °C–225 °C because higher temperatures reduce bubble stability and can degrade the UV stabilizer package. The formulation is usually a blend of 60–75 wt% hexene LLDPE, 20–35 wt% metallocene LLDPE, and 2–4 wt% carbon black or opaque white masterbatch containing hindered amine light stabilizers. The film is produced at 25–30 μm thickness for silage bales and 30–40 μm for silage pit covers. Puncture resistance is measured under ASTM D5748-19, Elmendorf tear under ASTM D1922-15, and outdoor weathering under ASTM G154-16 or ISO 4892-2:2021. A common target for this type of film is a puncture resistance above 2.5 J on a 25 μm sample, and the hexene branch architecture supports that without increasing film thickness to butene-LLDPE levels. The operational boundary is roll blocking: if the metallocene content exceeds 35 wt%, the film surface can develop blocking during storage in warm barns. Conversely, below 20 wt% metallocene, the cling and tack necessary for bale wrap are insufficient. The finished product is a round-bale stretch film with one black or white outer layer and a tackified inner surface; when colored masterbatch is used, the heavy metals and polycyclic aromatic hydrocarbon content must comply with REACH Annex XVII restrictions. No food-contact status is required, but the packaging of silage is governed by national agricultural film regulations; published data for this specific Bapolene 152P formulation is limited, so production validation is recommended for UV stabilizer interaction.In coextruded barrier films for frozen food and coffee packaging, Bapolene 152P is used as a heat-seal skin layer at 10–20 wt% of the total film thickness. The skin layer is processed through an outer extruder at 210 °C–230 °C, while the core barrier layer may contain polyamide or EVOH. The low sealing initiation temperature of the hexene LLDPE allows fin-seal and lap-seal operations at 120 °C–140 °C, measured by ASTM F88/F88M-21 on 25 mm strips. The layer ratio must be controlled to avoid delamination: if the skin layer exceeds 25% of the total structure, the oxygen barrier of the EVOH core is diluted and the film may fail the oxygen transmission rate target of 2 cm³/(m²·day) measured by ASTM D3985-17. The finished products are vacuum pouches and coffee bags with a seal strength above 15 N/25 mm. Compliance for direct food contact requires FDA 21 CFR 177.1520(c) and Regulation (EU) No 10/2011. The primary operational boundary is the mismatch in melt viscosity with EVOH; a tie layer is mandatory, and the skin layer must be purged during shutdown to avoid thermal degradation in the die. Published data for this specific Bapolene 152P layer configuration is limited, and the oxygen transmission values are supplied as industrial targets rather than product-specific guarantees.