Extrusion blow moulding of UN-certified 1H1/1H2 drums and 3H1 jerrycans from HDPE KL260C utilises the grade’s low melt mass-flow rate to maintain parison wall uniformity during accumulator-head discharge of 7–10 kg parisons. The dangerous-goods packaging test matrix is drawn from ADR Chapter 6.1 and IMDG Code Chapter 6.1: drop tests after conditioning at −18 °C, hydraulic pressure holding at 100 kPa for 5 min, leakproofness testing, and stack testing at 40 °C for 28 days; where metric accessories are specified, dimensional conformity to ISO 20848-1:2006 applies for 210 L open-head drums. A production-start formulation consists of 100 parts by weight virgin KL260C, 25 parts clean post-industrial regrind from the same drum line, 2.0–3.0 wt% of a 40% carbon black masterbatch for closed-head drums exposed outdoors, and 0.05–0.10 phr fluoropolymer process aid only when extruder head pressure exceeds 35 MPa on 80 mm/24:1 L/D grooved-barrier screws. Barrel set points are 180/190/200/205/210 °C, accumulator head set point 205 °C, mould coolant 8–12 °C, blow pressure 0.65–0.80 MPa, and cycle time 150–240 s for 220 L closed-head drums; on single-station shuttle machines with clamp force below 250 t, parison programming adjusts die gap from 4.5 mm at the top to 8.0 mm at the pinch area to limit wall-thickness deviation to 0.3 mm. Finished articles include UN 1H2 open-head drums, UN 1H1 closed-head drums from 20 L to 220 L, UN 3H1 jerrycans at 20 L/25 L, and necked-in pails where hot filling does not exceed 60 °C.

Can KL260C Function as the HDPE Skin Layer in Coextruded Automotive Fuel Tanks?

The six-layer coextrusion blow moulding of gasoline and diesel fuel tanks positions HDPE KL260C in outer and inner cap layers, where its slope of viscosity over the 0.1–1.0 s⁻¹ shear-rate range supports die-swell stability during programmed parison drop. Compliance for fuel tanks is anchored to ECE R34 for plastic fuel-tank approval and to evaporative emission limits under US EPA 40 CFR Part 86; AdBlue/DEF tanks additionally follow ISO 22241-1:2019 for AUS 32 contact and permeation resistance. At the layer-distribution level, a typical formulation is built as 20–25 wt% virgin KL260C outer layer, 35–40 wt% post-industrial HDPE regrind layer, 2–3 wt% maleic anhydride-grafted tie resin on each side of the barrier, 1.5–2.0 wt% EVOH barrier, and 20–25 wt% virgin KL260C inner layer; omission of the tie resin produces intermittent delamination at the HDPE/EVOH interface after 500 h of diesel immersion. Processing uses six-extruder coextrusion with die temperature 215–230 °C, 60-point parison wall-thickness control, mould coolant 12–18 °C, and a post-mould cooling fixture held for 180 s to reduce flange warpage below 2.0 mm. Final articles are 60–90 L gasoline tanks, 70–120 L diesel tanks, and 20–40 L SCR AdBlue tanks in commercial vehicles; published data for monolayer KL260C fuel tanks is limited, and continuous service above 60 °C with aggressive fuel blends requires additional barrier validation.

For 1,000 L intermediate bulk containers, the inner receptacle is produced by extrusion blow moulding of KL260C and then integrated into a galvanised steel or HDPE outer cage. The transport compliance route is ADR Chapter 6.5 and IMDG Code Chapter 6.5 for rigid plastics IBCs; food-contact inner bottles are assessed against FDA 21 CFR 177.1520 for olefin polymers and EU Regulation (EU) No 10/2011 for overall migration. A solvent-resistance formulation contains 100 parts KL260C, 1.0–1.5 wt% UV stabiliser masterbatch for outdoor distribution, and 0.2–0.5 wt% antistatic masterbatch for volatile solvent service; post-consumer recyclate is excluded from the inner layer in food-contact grades. Processing on a 120 mm accumulator-head machine with 30 kg shot capacity uses a barrel profile of 185/195/205/210/210 °C, die gap 4.0–8.0 mm, blow air pressure 0.55–0.75 MPa, and base cooling at 10–15 °C to stabilise the pallet-integration footprint; cycle time ranges from 120 s for 640 L bottles to 180 s for 1,000 L bottles. Output types include 640 L, 820 L, and 1,000 L UN 31H1 inner bottles, conductive bottles for solvent distribution, and food-grade liquid bulk containers where fill temperatures do not exceed 50 °C.

Twin-Sheet Thermoforming of KL260C Sheet into Heavy-Duty Pallets and Dunnage Trays

Flat sheet extrusion feeding twin-sheet thermoforming converts KL260C into load-bearing returnable logistics assets through a two-sided fused structure that replaces welded aluminium and wood. Pallet performance is verified against ISO 8611-1:2011 for flat pallet test methods and ASTM D1185 for palletised materials-handling systems; deflection under 1,000 kg racking load is controlled by part mass per sheet and rib depth rather than by surface thickness alone. The sheet formulation uses 70–75 wt% virgin KL260C, 25–30 wt% post-industrial HDPE regrind from the same thermoforming line, 2.0 wt% colour masterbatch, and 0.10–0.15 phr secondary antioxidant to resist multiple heat histories. Sheet extrusion operates at 210–220 °C through a 100 mm single screw and a fixed-lip die, with a three-roll stack at 80–90 °C to maintain sheet gauge of 5.0–8.0 mm; twin-sheet forming then heats the sheet surfaces to 170–180 °C, with plug assist speed at 250 mm/s, vacuum at −0.08 MPa, and twin-sheet fusion pressure at 0.5–0.7 MPa for 70–100 s of cooling. The finished article range covers 1,200 × 1,000 mm and 1,200 × 800 mm pallets with 9 legs, collars for bulk containers, and dunnage trays for automated warehouse retrieval systems; processing above 230 °C causes sheet sag and local thinning beyond 15% of nominal gauge.

Stationary vertical storage tanks produced by large-shot extrusion blow moulding use KL260C for cylindrical and rectangular vessels installed indoors or outdoors without pressure service. Design and fabrication compliance follows EN 12573-1:2000 for welded static non-pressurised thermoplastic tanks, DVS 2205 calculation procedures for chemical resistance, and NSF/ANSI 61 where potable water contact is specified; published data for KL260C in potable water service is limited, so qualification must include migration testing on the actual finished vessel. A chemical storage formulation contains 100 parts KL260C, 2.0–2.5 wt% of a 50% carbon black masterbatch for outdoor UV resistance, and 0.10–0.20 phr antioxidant package for extended heat ageing; regrind is limited to 20 wt% and is excluded from the inner wall in drinking-water applications. Processing on a 150 mm blow moulding line with 60 kg shot capacity uses a melt temperature of 200–215 °C, die gap 8.0–15.0 mm, blow pressure 0.5–0.7 MPa, and internal surface cooling at 15–20 °C; cycle times for 1,000 L tanks range from 25–35 min, and post-mould dimensional stabilisation requires 24 h before fitting closure flanges. Terminal products include 500–5,000 L closed-top storage tanks, conical-bottom dosing tanks, horizontal acid tanks with integrally moulded lugs, and double-walled containment vessels for bunded installations.