LG Chem HDPE FD0100 is specified as a high-molecular-weight high-density polyethylene film resin with density 0.949–0.952 g/cm³ per ISO 1183-1:2019 and melt flow index at 190 °C/2.16 kg of 0.04–0.07 g/10 min per ISO 1133-1:2022. The downstream tracks that follow are restricted to blown-film and sheet-film conversion because the narrow melt-flow window and high melt strength impose distinct screw, die-gap, and bubble-cooling requirements that are not transferable to injection molding.

In blown-film production of heavy-duty shipping sacks and FIBC inner liners, FD0100 is dry-blended with up to 20 wt% post-industrial regrind at 15–25 °C ambient before entering the extruder feed throat. A grooved-feed single-screw extruder having screw diameter 75–90 mm and L/D 30:1 is operated with barrel zones set at 170 °C feed, 190–200 °C compression, 200–210 °C metering, and adapter/die temperature of 210–220 °C. Die gap is held at 1.4–1.8 mm, blow-up ratio 3.5:1–4.5:1, frost line height 8–10 die diameters, and melt pressure before the screen pack limited to 350–450 bar to restrain shear heating. Carbon black masterbatch is added at 3.0–5.0 wt% for opacity and UV resistance; loading above 5.0 wt% reduces dart drop strength and increases gel count. For FIBC inner liners requiring static decay, an ethoxylated alkylamine antistat masterbatch is dosed at 0.5–1.5 wt%; the same formulation must avoid zinc stearate above 0.05 wt% because surface dust formation and heat-seal contamination occur. End films in thickness 40–80 µm are converted into open-mouth sacks, valve sacks, and liners for flexible intermediate bulk containers. Tensile yield is measured under ISO 527-3:2018 and dart drop impact under ASTM D1709-16; packaging heavy-metal compliance is assessed under EU Directive 94/62/EC, Article 11, with the sum of lead, cadmium, mercury, and hexavalent chromium limited to 100 mg/kg.

Extrusion Window and Gauge Uniformity for Thin High-Density Retail Bags

To produce T-shirt grocery bags in 6–15 µm gauge, FD0100 is compounded with 15–25 wt% linear low-density polyethylene or LDPE to reduce machine-direction tear propagation. Calcium carbonate masterbatch is held at 0–8 wt% for high-speed conversion; loadings above 10 wt% create die lip build-up and brittle failure in cold climates. Melt temperature at the die is controlled to 200–215 °C, die gap 0.8–1.2 mm, blow-up ratio 4:1–6:1, and frost line height 5–7 die diameters to stabilize the bubble at elevated take-off speeds. Blending FD0100 with LLDPE above 25 wt% lowers gauge accuracy and raises haze below 10 µm; blending below 10 wt% produces transverse-direction Elmendorf tear values that may fall below converter requirements for heavy grocery bag use when measured by ASTM D1922-15. Terminal bags are printed with flexographic inks after surface treatment to 40–45 mN/m. Indirect food-contact compliance is established under FDA 21 CFR 177.1520(c) and Commission Regulation (EU) No 10/2011, Annex I, with overall migration limit below 10 mg/dm². Process limitation in this segment is melt fracture at die-lip shear rates above 1,000–1,500 s⁻¹; polymer processing aid masterbatch is added at 300–800 ppm active fluoropolymer. Higher addition causes die-lip plate-out and reduces seal strength.

Containment liner extrusion with FD0100 demands a low blow-up ratio of 2:1–3:1 and an internal bubble cooling system because film thickness above 0.5 mm cannot be quenched uniformly by external air alone. The formulation is 100 wt% virgin FD0100 with 2.0–3.0 wt% carbon black masterbatch meeting GRI-GM13 carbon black dispersion requirements evaluated by ISO 18553. Antioxidant masterbatch is added at 0.2–0.5 wt%, and regrind is excluded unless oxidative induction time measured by ASTM D3895-19 remains above 100 min at 200 °C. Processing uses a flat die or spiral mandrel blown-film die with die gap 1.2–2.5 mm and melt temperature 190–220 °C. Output is limited by bubble cooling capacity rather than screw recovery; for 1.0 mm sheet on a 120 mm extruder, line speed typically falls near 5–10 m/min, though published data for this specific configuration is limited. Seamability by wedge welding, hot-air welding, or extrusion fillet welding requires the sheet surface to be free of processing-aid bloom. Fluoropolymer processing aids are therefore avoided, and metallic stearates are kept below 0.05 wt%. End uses are landfill basal liners, mining heap-leach pads, and agricultural containment ponds. Tensile and strain-at-break are measured per GRI-GM13 referencing ASTM D638, and tear resistance per ASTM D1004.

When FD0100 Is Used as the Structural Core of Three-Layer Barrier Film

For food and medical device overwrap, a three-layer blown coextrusion line distributes FD0100 into the core at 55–65 wt% of total film mass, with LLDPE-based skin layers at 30–40 wt%. When a barrier layer such as EVOH is included, a maleic anhydride grafted tie resin is added at 5–10 wt%. The core layer carries most of the film stiffness and downgauging resistance; skin layers provide low seal initiation and surface printing. Core melt stream is maintained at 205–225 °C and skin streams at 190–210 °C; die gap is 1.2–1.8 mm, blow-up ratio 2.5:1–3.5:1, and layer ratio accuracy is kept within ±2% to avoid curl and uneven seal transfer. Because FD0100 has low melt flow, the core extruder requires a barrier screw with L/D 30:1 and water-cooled grooved feed bushing; melt pressure before the coextrusion feedblock should not exceed 400 bar. Direct and indirect food-contact compliance is assessed under FDA 21 CFR 177.1520(c) and Commission Regulation (EU) No 10/2011, with overall migration below 10 mg/dm². For medical devices, biocompatibility evaluation is performed on the final device under ISO 10993-5:2009 and ISO 10993-10:2010. End articles include sterile barrier pouches, diagnostic kit overwrap, and hospital bed-protection film. Direct contact with polyamide layers without a maleic anhydride grafted tie resin causes delamination at seal stress and must be avoided.

Why Does High-Molecular-Weight HDPE Require Low Die Lip Shear for Confectionery Twist Wrap?

Confectionery twist film uses FD0100 at 90–100 wt% with anti-block masterbatch at 0.05–0.15 wt% silica or PMMA beads and slip additive at 200–800 ppm erucamide. The film is blown at 20–30 µm with die gap 1.0–1.4 mm, blow-up ratio 3:1–4:1, and melt temperature 195–215 °C. Low die lip shear is required because the high molecular weight fraction generates melt fracture at elevated output. Die-lip shear rates are held below 800 s⁻¹ to maintain optical clarity and deadfold. Slip migration to the surface occurs over 24–72 h after winding. Corona treatment before printing is set at 38–42 mN/m but delayed until after erucamide bloom to prevent rapid wetting decay. Twist retention is evaluated by the converter through tensile modulus measured under ISO 527-3:2018 and Elmendorf tear under ASTM D1922-15; a standardized ISO twist-retention method is not established. Compliance for food contact is under Commission Regulation (EU) No 10/2011 and FDA 21 CFR 177.1520(c); slip and anti-block substances must be listed in Annex I of Regulation (EU) No 10/2011 or covered by a valid national positive list. End products are candy twist wraps, lollipop films, and chocolate novelty overwrap. Process limitation is that film for high-speed twist lines above 800 pieces/min may require higher stiffness than FD0100 alone provides; blending with 10–20 wt% HDPE of narrower molecular weight distribution improves cutting without linting.

Envelope window film and paper lamination use FD0100 as a 12–25 µm blown film where high stiffness, low neck-in, and controlled slip are required. Formulation is 90–100 wt% FD0100 with 0–10 wt% LLDPE to improve fold endurance; anti-block masterbatch is dosed at 0.05–0.15 wt% and slip at 200–600 ppm erucamide. Die gap is set at 0.8–1.2 mm, blow-up ratio 3:1–5:1, melt temperature 195–210 °C, and frost line height 4–6 die diameters. Slip addition above 600 ppm reduces adhesive bond strength in window patch applications and causes paper lamination surface haze. The film is corona treated to 38–42 mN/m before lamination or flexographic printing. Regulatory compliance for stationery and mail packaging is governed by REACH Regulation (EC) No 1907/2006, Annex XVII; food-contact status under Commission Regulation (EU) No 10/2011 is applicable only when converters qualify the final article for direct food contact, which is uncommon in this segment. End products are envelope window patches, pressure-sensitive lamination base films, and mailing envelope film. The main process failure observed on production lines is gel formation: pre-drying at 70–80 °C for 1–2 h is applied only when silo condensation or relative humidity above 60% has caused surface moisture, because HDPE FD0100 is not hygroscopic under normal indoor storage.