Industrial container blow moulding of HTA-001 on single-station shuttle equipment is built around a melt temperature of 190–220 °C measured at the die entry, with head and die zones held at 200–215 °C to preserve parison hang strength. The grade has a nominal melt flow rate of 0.30 g/10 min under ISO 1133-1:2022 at 190 °C and 2.16 kg, which is sufficiently low to limit accumulator-head leakage and sufficiently high to fill wall-thickness-programmed parisons for containers up to 30 L. On a 70 mm grooved-feed extruder with 30:1 L/D, barrel temperature settings from feed to die are typically 190/200/205/210/215 °C, while mould coolant is maintained at 8–15 °C to shorten cooling cycles and reduce distortion at the pinch-off. Parison programming is adjusted so that the wall measured after trimming is 4.0–5.0 mm in the pinch-off zone and 2.0–2.5 mm at the shoulder; this is necessary because the top-load requirement for 20 L jerry cans tested in compression exceeds 2,000 N after conditioning at 40 °C for 48 h. Blow air is introduced at 0.6–0.8 MPa, and the mould clamp force for these containers is typically below 25 tonnes. The formulation at the hopper is a dry blend of virgin HTA-001, 15–25 wt% clean in-house regrind, and 2–4 wt% of a PE-based colour masterbatch; regrind fractions above 30 wt% can reduce parison melt strength and shift the swell ratio, which produces uneven wall sections at the chime and handle regions. The finished containers are inspected for environmental stress crack resistance under ASTM D1693-15 using 100 % Igepal CO-630 at 50 °C, for tensile yield under ASTM D638-14, and for low-temperature drop resistance under ASTM D2463-15. UN certification for Packing Group II liquids requires a drop test from 1.2 m after conditioning at −18 °C and a hydraulic pressure test at 100 kPa internal pressure, depending on the closure type and stacking configuration.

What Restricts Regrind Content in Food-Contact Thermoformed Sheet Made from HTA-001?

When HTA-001 is extruded into thin-gauge food-contact sheet for trays, the regulatory boundary controls regrind use more tightly than mechanical degradation. Virgin HTA-001 meets FDA 21 CFR 177.1520(c) and EU 10/2011 Annex I as a polyolefin for direct food contact, but the finished sheet must be validated for overall migration below 10 mg/dm² under EU 10/2011 Article 12 using simulants A, B, C, D1, D2, E, and 95 % ethanol, depending on the food type. Sheet extrusion is performed on a 90 mm single-screw extruder with a 30:1 L/D barrier screw, a 60/90/90 screen pack, and a melt pump upstream of a 600–900 mm flat die with a die gap of 1.0–1.2 mm. Barrel temperatures are set from 185 °C at the feed throat to 210 °C at the adapter, and the melt temperature measured by an exposed-tip thermocouple is held between 195 °C and 215 °C. A three-roll stack operating at 70/85/95 °C from bottom to top polishes the sheet and controls shrinkage; sheet thickness is normally 0.4–1.5 mm for trays. The thermoformer uses contact-panel ovens set at 220–260 °C, with sheet surface temperature stabilised at 165–185 °C and checked by a fixed IR pyrometer before forming. A PA6 plug with 25 wt% glass-fiber reinforcement is used for plug-assisted forming, and forming air pressure is maintained below 0.4 MPa. Thermoformed skeletons are reground and may be reintroduced at 20–40 wt% in non-food industrial trays; for food-contact applications under EU 10/2011, the regrind stream must come from the same food-contact sheet and cannot be blended with non-food scrap. The practical upper validated limit for HTA-001 food-contact sheet is commonly 30 wt% regrind, above which puncture impact measured by ISO 6603-2 drops below the minimum set by dairy and meat packaging converters. The trays are not suitable for retort or hot-fill above 85 °C because the Vicat softening point of HTA-001 is approximately 128 °C under ISO 306/A, and top-load creep becomes the limiting failure mode at temperatures above the practical thermal service window of the formed part.

Chemical tank lining sheet requires a different thermal history than thin-gauge packaging because residual stress and weld-line quality determine the service life of secondary containment. HTA-001 is extruded into flat sheet of 2–8 mm thickness on a 120 mm single-screw extruder with 36:1 L/D, a static melt mixer, and a three-roll stack with roll temperatures between 70 °C and 110 °C depending on thickness. The melt temperature is kept at 210–230 °C to ensure homogenisation without exceeding 240 °C, where oxidative chain scission can lower molecular weight and reduce environmental stress crack resistance. For outdoor installations, the formulation is a blend of HTA-001, 2–4 wt% of a 40 wt% carbon black PE masterbatch, and 10–20 wt% regrind from the same sheet; the carbon black level in the final sheet is maintained at 2.0–2.5 wt% for UV resistance. Sheet is cut and welded into tanks, liners, and bunded containment cells using HTA-001 welding rod or strips. Hot-gas welding is carried out at 280–320 °C, while extrusion welding requires a preheated groove at 180–220 °C; fusion pressure is adjusted so that the weld bead extends no more than 1.5–2.0 mm above the sheet surface. Chemical resistance of the fabricated liner is tested according to ISO 175:2010 with immersion in 30 wt% sodium hydroxide, 80 wt% phosphoric acid, and 5 wt% sodium hypochlorite at 40 °C for 90 days. HTA-001 is not recommended for continuous contact with concentrated nitric acid above 30 wt% above 40 °C, or with aromatic and chlorinated solvents that cause swelling, because the semicrystalline matrix absorbs and plasticises, reducing long-term modulus and weld strength. The final liner is typically installed in steel or concrete bunds, where weld continuity is verified by spark testing at 20–30 kV and vacuum box testing under −0.3 bar relative pressure.

When Multi-Layer Barrier Containers Use HTA-001 as the Structural Layer

Coextrusion blow moulding of 1–5 L barrier containers for solvents, crop-protection products, and oxygen-sensitive liquid detergents uses HTA-001 for the inner and outer HDPE layers, with a central barrier layer of EVOH or polyamide. A six-extruder line with a six-layer die head typically arranges the melt streams as HDPE/regrind/tie/barrier/tie/HDPE, where HTA-001 is used in the skin layers, the regrind layer is a stream of recycled barrier bottle flake, and the tie layer is a maleic-anhydride-grafted polyethylene. The EVOH or PA barrier layer represents 3–5 vol% of the total wall thickness; the barrier layer is protected from moisture by HDPE on both sides. Die head zones are controlled at 200–215 °C to avoid thermal degradation of EVOH, which can crosslink and form gels under extended residence time. The melt strength of HTA-001 at 0.30 g/10 min helps maintain layer distribution during parison inflation, but the difference in extensional viscosity between HTA-001 and the barrier resin can produce non-uniform barrier layer thickness at pinch-off and weld-line regions, a failure mode visible only by cross-section microscopy. Regrind from bottles is pulverised and metered into the regrind layer at up to 35 wt% of total bottle mass; above this level the oxygen barrier measured by ASTM D3985 and the water vapour transmission rate measured by ASTM F1249 begin to diverge from the specification because barrier layer continuity is compromised. The final container is qualified by drop testing at −18 °C, ESCR testing under ASTM D1693, and closure torque retention after 14 days at 50 °C. Published data for this specific HTA-001 coextrusion configuration is limited; industrial qualification therefore relies on pilot trials on the same six-layer head geometry intended for production, not on single-layer data transfer.

Small-capacity pharmaceutical bottles blow moulded from HTA-001 are subject to pharmacopoeial polymer tests in addition to mechanical performance limits. The resin is processed on an intermittent extrusion blow moulder with a 40 mm screw and 24:1 L/D, a melt temperature of 180–210 °C, and mould temperature of 10–15 °C to produce bottles from 25 mL to 500 mL. Parison programming sets wall thickness at 0.6–1.0 mm, because thinner sections reduce child-resistant closure engagement and thicker sections risk sink marks at the neck. The bottles are qualified under USP <661> for chemical compatibility, acidity or alkalinity, and UV absorbance, under Ph. Eur. 3.1.3 for polyethylene containers, and under ICH Q3D for elemental impurities where the HDPE grade contributes no intentionally added metal compounds. The closure system is typically a polypropylene child-resistant cap with an induction-sealed liner; HTA-001 bottles must maintain neck roundness within 0.2 mm diameter tolerance after 24 h at 50 °C to ensure seal integrity. Regrind is generally not permitted in the product-contact layer for pharmaceutical bottles unless the drug product stability program includes the specific regrind fraction and the pharmacopoeial migration profile is re-established. Failure to control melt temperature below 220 °C can produce odour and taste compounds that fail USP sensory testing.

Reusable Industrial Dunnage Trays Thermoformed from Thick HTA-001 Sheet

Thick-gauge thermoforming for returnable dunnage trays and material-handling inserts uses HTA-001 sheet that is extruded immediately upstream or supplied as cut blanks. The sheet extrusion line operates at a melt temperature of 215–230 °C, using a 120 mm extruder with 36:1 L/D and a gear pump to stabilise output at 800–1,200 kg/h. The die gap is set at 4.0–7.0 mm for finished sheet from 3.0 mm to 8.0 mm; the roll stack runs at 70–100 °C to reduce locked-in stress and improve flatness after trimming. Forming is performed on a four-station rotary thermoformer with quartz or ceramic heaters, sheet surface temperature of 175–195 °C, and plug assistance using a syntactic foam plug coated with PTFE-impregnated fabric. The mould is water-cooled at 15–25 °C, and forming pressure is maintained at 0.5–0.7 MPa. HTA-001 is suitable for this application because its high molecular weight imparts resistance to repeated forklift impact, and the thermoformed trays are qualified by ISO 6603-2 puncture-impact tests and ASTM D648-18 heat deflection temperature under load. The final trays are used to transport stamped metal components, battery housings, and injection-moulded automotive parts; load ratings are typically verified on a flat floor by stacking 1,000 kg for 72 h at 40 °C, and residual deformation must not exceed 3 mm. Regrind from die-cut skeletons can be included up to 25 wt% without loss of the required stiffness; higher fractions increase shrinkage and warp after forming because the molecular weight distribution is narrowed by repeated heat stabilisation cycles.