At blown film die diameters between 350 mm and 650 mm and die gaps of 1.8–2.3 mm, heavy-duty liner production for bulk powders and pelletized resins has used Exceed XP 8346CB as the major ethylene–1-hexene metallocene LLDPE component because its nominal density of 0.934 g/cm³ and 190°C/2.16 kg melt flow rate of 3.6 g/10 min reported under ASTM D1238-20 create a lower melt-strength window than high-pressure LDPE, but compensate with higher 1% secant modulus and greater dart drop energy per unit thickness under ASTM D1709-15a. The formulation most frequently recorded on monolayer dies for 25–40 µm gusseted sack liners is 65–80 wt% Exceed XP 8346CB, 20–35 wt% high-pressure LDPE, 0.1–0.3 wt% fluoroelastomer processing aid, and 0.2–0.6 wt% of a 10–20% active antiblock masterbatch. The high-pressure LDPE is retained as a melt-strength donor; reducing its content below 15 wt% on single-lip air rings alternately lifts the frost line and produces gauge bands when exhaust airflow fluctuates by more than 0.5 kPa.

Compliance for food-grade bulk liners follows 21 CFR 177.1520(c) 3.2a and EU Regulation (EU) No 10/2011; industrial chemical bagging operations also require documentation under REACH (EC) No 1907/2006 Article 33 for SVHC communication and, where export includes heavy metal limits, Directive 94/62/EC packaging essential requirements. Extrusion lines used for this application typically run grooved feed extruders with L/D 30–36 and barrier screws; melt temperature at the die lip is held at 210–240°C, because lower settings below 190°C have resulted in visible microgel formation in the frost line region and a measurable drop in dart impact at thicknesses below 30 µm. Bubble stability is process-sensitive: at blow-up ratios above 3.5:1 and haul-off speeds above 120 m/min, edge waviness and layflat width variation exceeding 4% are recorded on 450 mm dies when LDPE drops under 15 wt%. Finished products include gusseted box liners for powder resins, valve sacks for extruded plastic pellets, side-seam woven-bag inserts for FIBC transport of granular additives, and 100–200 µm drum liners for viscous hydrocarbon resins.

What Limits Stretch Hood Film Load Retention When 8346CB Replaces High-Pressure LDPE?

Pallet containment hoods produced at 50–80 µm on three-layer coextrusion blown film lines with die diameter 250–500 mm and blow-up ratio 4.0–5.0:1 incorporate Exceed XP 8346CB at 30–50 wt% to increase load-stabilizing stiffness without sacrificing the cold-stretch ratio required by automatic pallet hooding machinery. The remaining formulation is typically split between high-pressure LDPE and a lower-density C6-LLDPE at 20–35 wt% each, with 0.1–0.3 wt% oleamide or erucamide slip masterbatch and 0.05–0.2 wt% antiblock. If the 8346CB fraction exceeds 55 wt%, elastic recovery after 200% strain measured under ASTM D5459-18 deteriorates during ambient temperature cycling, and hoods loosen on pallets stored below 5°C because the higher-density metallocene domains retain more permanent deformation after the stretching cycle.

The downstream process uses three-layer coextrusion with screw diameters 45–75 mm, die gap 1.5–2.0 mm, internal bubble cooling air at 18–22°C, and melt temperature 190–220°C. Output per die circumference typically ranges from 0.8 kg/h/mm to 1.2 kg/h/mm; exceeding the upper output while running 8346CB above 50 wt% lowers bubble stability and creates transverse gauge bands visible at the gusseted fold edges. Compliance is primarily non-food industrial under REACH (EC) No 1907/2006 and Directive 94/62/EC; where the hood contacts packaged food bags, the complete film is assessed under EU Regulation (EU) No 10/2011 for overall migration below 10 mg/dm² using aqueous and fatty simulants. Terminal products include stretch hoods over gypsum board stacks, bagged cement pallets, PE pipe coils, air-conditioning units, and mixed pallet loads in chemical distribution.

Because impact failure at −20°C in frozen vegetable and seafood packaging is controlled by low-temperature tie-chain mobility rather than room-temperature tensile yield, sealant webs in 40–60 µm formats are formulated with 60–80 wt% Exceed XP 8346CB, 10–25 wt% lower-density C6-LLDPE, and 5–15 wt% high-pressure LDPE. The lower-density LLDPE lowers seal initiation to 85–100°C on vertical form-fill-seal machines; a 100% 8346CB sealant may require 105–115°C jaw set-points at 0.4 s dwell and 1.5 N/mm² sealing pressure, which narrows the high-speed packaging window and increases the risk of seal-through-contamination failure in powders or frost crystals.

Blown film lines for this application run with internal bubble cooling, die gap 1.2–1.8 mm, BUR 2.8–3.5:1, and melt temperature 190–220°C to avoid oxidative degradation in the higher-viscosity bubble. Because the 0.934 g/cm³ grade scatters more light than a 0.918 g/cm³ grade, the film is generally not used for transparent retail display; converters either apply reverse-printed laminate layers or run opaque surface printing for retail-ready flexible packages. Terminal products include bottom-gusseted IQF vegetable pouches, frozen seafood poly bags, ice cream pillow pouches, and side-seal bags for frozen bakery products.

Silage Cover Tear Resistance and Carbon Black Loading in 8346CB Blown Film

Agricultural silage covers and bale wraps at 100–200 µm use Exceed XP 8346CB at 60–85 wt% with a high-flow C4-LLDPE at 10–30 wt% to improve bubble stability under wind, 3–6 wt% of a 40–50 wt% carbon black masterbatch, and 0.3–0.8 wt% of a combined HALS/UV-absorber masterbatch. The carbon black loading is selected not only for UV opacity but also to comply with REACH (EC) No 1907/2006 Annex XVII Entry 50, which restricts polycyclic aromatic hydrocarbons in carbon black used in consumer articles; masterbatches are specified to contain benzo[a]pyrene below 1 mg/kg and the sum of eight listed PAHs below 10 mg/kg. The 8346CB fraction supplies MD tear resistance after freeze-thaw cycles where field-stored bales are walked over by feed-out machinery.

Extrusion uses a three-layer blown film line with die gap 2.0–3.0 mm, BUR 2.2–3.0:1, and melt temperature 200–230°C; lines without internal bubble cooling run the narrower die gap and lower BUR to suppress bubble flutter in outdoor air. Accelerated weathering is tested under ASTM G154-16 Cycle 1, with typical converter specifications requiring no tensile elongation-at-break loss greater than 25% after 1,500 h exposure. Terminal products include round bale wrap, square bale sleeves, trench silo covers, and 2.0 m layflat silage bags; field failures predominantly present as MD tear propagation at foot-traffic and machinery contact zones when thickness drops below 120 µm without raising carbon black and C4-LLDPE content.

When a Blown Film Sealant Web Is Laminated to BOPET or BOPP

Lamination converters running solventless adhesive lines use a sealant web containing 40–70 wt% Exceed XP 8346CB, 20–40 wt% high-pressure LDPE, and 0.2–0.5 wt% slip/antiblock masterbatch. The film is corona treated inline to 42–46 mN/m before lamination; the solvent-free two-component polyurethane adhesive is applied at 1.5–2.5 g/m², followed by nipping at 60–85°C and curing for 24–48 h at 25–40°C. Direct food contact evaluation follows 21 CFR 177.1520 and EU Regulation (EU) No 10/2011; the adhesive layer is assessed under 21 CFR 175.105 for indirect food contact or under EU 10/2011 as a non-food functional barrier if migration data supports barrier performance. For dangerous goods transport packaging, the finished pouch may require compatibility testing under UN 6.1 or UN 8 specific gravity and internal pressure methods depending on the shipped chemical class.

Terminal products include laundry detergent stand-up pouches, pet food zipper pouches, water softener pillow pouches, mineral additive valve bags, and dry pool chemical packages. The grade's higher-density sealant layer increases stiffness for crush resistance, but seal initiation is 10–15°C higher than lower-density LLDPE sealants; converters offset this by adding lower-density LLDPE or by increasing dwell by 0.1–0.2 s on pouch machines. Published data for this specific configuration is limited in some adhesive-lamination combinations, so migration testing is performed on the finished laminate rather than extrapolated from the sealant resin alone.

High-speed vertical form-fill-seal systems making side-gusseted pet food pouches at 80–120 pouches/min use a monolayer or three-layer blown film containing 70–90 wt% Exceed XP 8346CB in the core and sealant skins. The addition ratio is offset by 10–20 wt% of a lower-density LLDPE or ULDPE to maintain hot-tack and seal-through-contamination resistance; the 0.934 g/cm³ grade alone shifts seal jaw set-points up by 10–15°C and increases crease-flex pinholes in side gussets if film thickness is below 50 µm. Blown film extrusion uses die gap 2.0–2.5 mm, BUR 2.5–3.5:1, and melt temperature 190–215°C; VFFS seal jaws operate at 115–150°C, dwell 0.3–0.8 s, and pressure 1.5–2.5 N/mm².

Compliance for primary food packaging follows 21 CFR 177.1520(c) 3.2a and EU Regulation (EU) No 10/2011; for exports to China, GB 4806.7-2016 polyethylene food contact material standards apply. The grade is not suited for high-clarity pouches; haze development on the packaging line is visible when film thickness exceeds 70 µm and cannot be eliminated by processing alone without changing to a lower-density polymer. Terminal products are side-gusseted pet food pouches, powder detergent quad-seal pouches, granular fertilizer pouches, and charcoal briquette bags.