High-molecular-weight high-density polyethylene film extrusion for thin-gauge grocery sacks specifies Lotte Chemical Titan HDPE HF7000 at a nominal melt flow index in the 0.04–0.06 g/10 min range measured under ISO 1133-1:2022 at 190 °C/2.16 kg and density 0.954–0.958 g/cm³, with monolayer or 80:20 HDPE/LLDPE dry-blend operations running at film thickness from 12 µm to 20 µm. The downstream production process uses a single-screw extruder with a 30:1 L/D barrel, barrier-flight screw, and spiral mandrel die with 1.2–1.8 mm die gap; melt temperatures are held at 204–227 °C, the blow-up ratio is 3.5:1–4.5:1, and a dual-lip air ring controls frost-line height to prevent gauge variation at high layflat speeds. Inline conversion equipment performs bottom sealing, handle punching, and perforation; the critical downgauging threshold is monitored by dart impact under ASTM D1709 Method A and Elmendorf tear under ASTM D1922. Formulation addition ratio is 100 wt% HF7000 in monolayer structures, or 80 wt% HF7000 with 20 wt% LLDPE for impact modification; when post-consumer reclaim is used in a coextruded core, the core layer is 20–40 wt% of total structure with 2–3 wt% black masterbatch and 0.5–1.0 wt% processing aid masterbatch. Compliance for non-food packaging is assessed under ASTM D4976-12a and heavy-metal limits under CONEG model legislation. Terminal finished product types include T-shirt grocery sacks, produce roll bags, and thin-gauge carryout sacks.

In refuse sack three-layer coextrusion, the use of HF7000 as virgin skin layers over a post-consumer recycled HDPE core shifts the primary release test from monolayer tensile yield to dart impact distribution and tear-direction stability. The production process employs a 200–350 mm three-layer spiral mandrel die with layer distribution 20/60/20 skin/core/skin, die gap 1.8–2.2 mm, and melt temperatures of 210–235 °C for the virgin HF7000 skins and 200–220 °C for the PCR core to limit gel formation from residual contaminants. Formulation addition ratio is 50–70 wt% post-consumer HDPE in the total structure, 20–40 wt% HF7000 split between the two skins, 2–6 wt% carbon black masterbatch, and 1–3 wt% antioxidant/antifibrillation masterbatch. Film thickness for municipal refuse sacks is 25–80 µm depending on handle-load class, and the bubble is stabilised at blow-up ratios between 3.0:1 and 4.0:1 with an oscillating haul-off for gauge band distribution. Compliance for household refuse sacks is tested under EN 13592, and recycled-content claims follow EN 15343 traceability procedures. Dart impact is measured under ASTM D1709 Method B and tear under ASTM D1922 in both machine and transverse directions; published fracture-surface data for HF7000/PCR coextruded refuse sacks is limited, so converter qualification relies on SPC control of gel count and drop-test failure rates. Terminal finished product types include municipal refuse sacks, drawstring refuse bags, and contractor-grade cleanup bags.

Cereal Liner Moisture Barrier Coextrusion and Seal Integrity

Food-contact cereal liners using HF7000 as the HDPE moisture-barrier layer in blown coextrusion place the processing focus on seal initiation temperature and interlayer adhesion to an LLDPE sealant skin. The downstream production process routes the HF7000 layer at 20–40 wt% of a two- or three-layer structure, with the LLDPE sealant layer at 50–70 wt% and an optional LLDPE-rich transition layer at 5–10 wt% to reduce interfacial instability at high drawdown. Slip and antiblock masterbatches are added only to the sealant layer at 0.05–0.15 wt% active additive, not into the HDPE bulk, to avoid reducing interlayer adhesion. Extrusion conditions include a 1.5–2.0 mm die gap, melt temperatures of 204–227 °C, blow-up ratio 2.5:1–3.5:1, and total film thickness 25–50 µm; inline corona treatment is set to 38–42 mN/m before slitting for downstream form-fill-seal operations. Compliance is anchored to FDA 21 CFR 177.1520 for olefin polymers and EU Regulation 10/2011 overall migration limit of 10 mg/dm², with manufacturing under EC 2023/2006 GMP. Water vapour transmission rate is tested under ASTM E96, and seal strength is tested under ASTM F88 at converter-specified seal jaw temperatures. Terminal finished product types include cereal box liners, cracker sleeves, and dry-food pouch liners.

When HF7000 Is Specified as the Skin Layer in Heavy-Duty Industrial Liner Converters

Heavy-duty industrial liner production uses HF7000 in the outer skins of thick blown film structures where puncture and tear resistance in the 50–200 µm thickness band are primary release criteria. The converting line runs a three-layer die with layer distribution 30/40/30 or 20/60/20, using post-industrial regrind or recycled HDPE in the core; total output is governed by melt-pressure stability at the screen changer because high-molecular-weight film grades exhibit strong shear thinning but can create high back-pressure during start-up below 190 °C. Barrel temperatures are set at 190–225 °C, die temperature at 210–220 °C, die gap 1.8–2.5 mm, and blow-up ratio 3.0:1–4.0:1; the bubble is stabilised with a high-velocity dual-lip air ring and an oscillating haul-off to spread gauge bands. Formulation addition ratio in the skins is 80–100 wt% HF7000 with 0–20 wt% LLDPE for impact modification, 2–5 wt% carbon black masterbatch, 0.5–1.5 wt% UV/HALS stabiliser masterbatch for outdoor exposure, and 10–30 wt% internal process regrind in the core. Compliance for industrial packaging is assessed under ASTM D4976 and, for dangerous goods interior liners where applicable, under the UN Recommendations on the Transport of Dangerous Goods, Chapter 6.1 performance tests for drop, stack, and leakproofness. Film property testing uses ASTM D882 tensile, ASTM D1709 dart impact, and ASTM D1922 tear. Terminal finished product types include industrial bin liners, anti-static equipment covers, and heavy-duty transport packaging liners.

Construction Vapour Retarder Sheeting Under ASTM D4397 and EN 13984

In building construction vapour control layers, HF7000 is extruded as a single- or three-layer membrane where water vapour diffusion resistance, tensile properties, and tear resistance are specified independently by the project. The extrusion line uses a 300–500 mm die, 2.0–2.5 mm die gap, melt temperatures of 210–230 °C, and blow-up ratios of 2.5:1–3.5:1 to produce film in the 100–200 µm thickness range; layflat widths of 1.5–4.0 m are slit from an oscillated roll. Formulation addition ratio is 90–95 wt% HF7000, 2–5 wt% carbon black masterbatch for UV resistance, 1–3 wt% HALS-antioxidant masterbatch, and 0–5 wt% LLDPE for retained impact in cold-weather installation. The finished membrane is tested for tensile properties under EN 12311-2, water vapour transmission under EN 1931, and tear resistance under EN 12310-2; North American projects add ASTM D4397 and ASTM E96 desiccant method. CE marking of vapour control layers falls under EN 13984, and reaction-to-fire classification is tested under EN 13501-1. The material should not be specified for continuous service temperatures above 80 °C or for direct contact with aromatic hydrocarbon solvents, because environmental stress crack resistance is formulation-dependent. Terminal finished product types include wall and roof vapour retarders, foundation damp-proof membranes, and temporary construction enclosures.

Dry-cleaning and garment bag film converting uses HF7000 as a low-odour, medium-stiffness blown film in thickness bands of 15–25 µm, where the film must survive automatic bagging machinery without blocking at perforation lines or tearing at heat-sealed edges. The downstream production process is monolayer or two-layer blown film with a 1.5–2.0 mm die gap, melt temperatures of 200–225 °C, blow-up ratio 3.0:1–4.0:1, and an antiblock masterbatch included at 0.5–1.5 wt%; slip masterbatch is added at 0.1–0.3 wt% only when automatic bag opening demands lower coefficient of friction, and when charge-induced blocking occurs below 18 µm, an antistatic masterbatch replaces slip at 0.1–0.5 wt%. Online converting slits the tube, applies perforations at garment hanger positions, and heat-seals the bottom seam before roll packaging. Compliance for garment bags is primarily mechanical and packaging-related; residual heavy metals and packaging formulations align with CONEG model legislation, while film tensile and tear properties are tested under ASTM D882 and ASTM D1922. Terminal finished product types include dry-cleaning garment bags, laundromat roll stock, and retail apparel cover bags.