RTP 2099 X 115382 C is processed at 100 wt% of the moulded article in rigid cosmetic packaging applications; the granules are not let down with additional HDPE carrier because the compound is already formulated as a dispersive PLA/HDPE blend with a melt morphology balanced for gloss retention and hinge performance. Before processing, the resin is dried in a desiccant-bed dryer at 60 °C to 70 °C for 2 h to 3 h, with a dew point of -20 °C or below, so that residual moisture in the PLA-rich domains remains below 0.025% when checked by Karl Fischer titration according to ISO 15512:2019; failure to maintain this moisture threshold produces hydrolytic chain scission during plastication, resulting in splay at the distant edge gates and a measurable increase in melt flow rate under ISO 1133-1:2022. The compliance framework for cosmetic packaging supplied in the EU is anchored to Regulation (EC) No 1223/2009, Article 17, under which packaging materials are evaluated within the finished cosmetic product safety assessment, and to Regulation (EC) No 1907/2006, Article 33 for SVHC communication at concentrations above 0.1 wt%. Packaging placed on the EU market must also meet the Packaging and Packaging Waste Directive 94/62/EC, Article 11, which limits the sum of lead, cadmium, mercury and hexavalent chromium to 100 mg/kg in the packaging component. Production tooling is typically a high-polish all-electric injection mould with a clamp force of 120 t to 180 t, a general-purpose screw with 20:1 L/D and a compression ratio of 2.2:1 to 2.8:1, and valve-gated hot runners with servo-driven pin control. Barrel set points are staged from a rear zone of 150 °C to 160 °C, a centre zone of 170 °C to 185 °C, a front zone of 190 °C to 205 °C, and a nozzle of 200 °C to 210 °C, with actual melt temperature controlled at 190 °C to 205 °C. Mould temperature is maintained at 20 °C to 40 °C through turbulent-flow water channels; mould temperatures above 45 °C extend cycle time because the PLA phase crystallises slowly and can adhere to the core after ejection. The terminal product types are jar bases, compact mirror frames, overcap shells for tubes, and airless dispenser collars; the cap or jar body is produced as a single component and later assembled with liners, magnets, or aluminium closures. The addition ratio to the final moulded component is 100 wt% of this compound, with in-house regrind limited to 15 wt% or less because higher regrind fractions increase the number of PLA-rich melt cysts and produce visible flow haze on polished cosmetic surfaces. During interruptions, hot-runner nozzles should not remain at temperatures above 210 °C for more than 5 min; purging with polycarbonate or PET is avoided because their processing temperatures above 240 °C accelerate PLA chain scission and create black specks in the next production run.

Injection-Moulded Closures for Household Chemical and Agrochemical Reservoirs

Because closure shells typically incorporate tamper-evident bands and internal thread undercuts, production tooling is built with hydraulic unscrewing cores or collapsible cores; the material must hold thread diameter within ±0.05 mm after ejection because the cap-to-neck torque-tension relationship is governed by hoop stress in the thread root, and excessive shrinkage variation creates loosening under transport vibration. The compound is introduced at 100 wt% of the closure formulation; a heavy-metal-free colour masterbatch may be dosed at 2 wt% to 3 wt%, and post-industrial regrind of 10 wt% to 20 wt% is acceptable only for closures not subject to dangerous-goods qualification because the second heat history lowers environmental stress-crack resistance. Closures intended for child-resistant packaging are tested according to ISO 8317:2015, and closures used on household chemical products are assessed within the labelling and packaging framework of Regulation (EC) No 1272/2008; where the closure is supplied for agrochemical reservoirs, inertness documentation under Regulation (EC) No 1107/2009 is normally required. Downstream production uses high-cavitation stack moulds with 32 to 48 cavities, unscrewing core assemblies with gear-driven rotation at 20 rpm to 40 rpm, and eight-zone hot runners; injection velocities are set from 300 mm/s to 450 mm/s to generate sufficient frictional heating without exceeding the PLA degradation threshold. Cavity pressure at the gate is held at 300 bar to 500 bar during packing, and holding time is set between 0.8 s and 1.5 s depending on gate diameter. Melt temperature is kept at 180 °C to 195 °C, and mould temperature is controlled at 15 °C to 25 °C to stabilise roundness. Terminal product types include child-resistant bleach caps, detergent spout caps, and graduated agrochemical dosing closures with linerless plug seals. Continuous contact with hypochlorite or nonylphenol ethoxylate surfactants requires post-mould annealing at 60 °C for 1 h to reduce moulded-in weld-line stress; without this step, cracking may initiate at the knockout tab or at the tamper-band bridge points. Environmental stress-crack resistance is checked using ASTM D1693-15 on compression-moulded plaques, and the supplier’s published data for this specific pigmented formulation is limited, so closure dimensions and torque retention must be revalidated on the converter’s production tooling after any colourant or regrind alteration.

For thin-wall drawer organizers and stackable storage trays, cavity fill is governed less by the melt viscosity of the HDPE matrix than by the shear-thinning response of the dispersed PLA-rich phase; consequently, the injection velocity profile is set as a decelerating ramp from 250 mm/s during the first third of fill to 80 mm/s during final packing to avoid jetting at the gate and to prevent melt fracture in hinge zones. The article is moulded at 100 wt% of this compound, with an optional 5 wt% HDPE-based colour masterbatch for opaque colours; in-house regrind is permitted up to 20 wt% only when the regrind fraction is homogenised through a low-shear ribbon blender to avoid pellet-size and density segregation between the PLA-rich and HDPE-rich granules. Compliance for these non-food consumer articles is based on the General Product Safety Regulation (EU) 2023/988, Regulation (EC) No 1907/2006, Article 33 for SVHC tracking, and the material is not cleared for direct infant feeding or food-contact use under Regulation (EU) 10/2011 unless end-specific migration testing on the finished article is performed. Downstream production runs on 160 t to 220 t injection presses with 24:1 L/D screws, nominal wall thickness from 0.8 mm to 2.0 mm, and valve-gated hot runners; mould temperature is held at 30 °C to 50 °C to improve surface flatness on long side walls. Packing pressure is limited to 40 MPa to 60 MPa, followed by a cooling time of 8 s to 12 s for a 1.5 mm wall. Terminal product types include under-bed storage boxes, modular drawer inserts, shelf bins, and stackable hanger components. Because the PLA phase slows final solidification, the ejection stroke is delayed by 1 s to 2 s compared with conventional HDPE of the same melt flow rate to reduce claw marks on hot surfaces; release agents are not used because they introduce surface residues that interfere with adhesive labels and aqueous cleaning after use.

What Limits Extrusion Blow Moulding in Non-Food Personal Care Bottle Production?

Temperature uniformity across the parison die gap is the first processing boundary, because the PLA domains in the melt stream have a lower extensional viscosity than the HDPE continuous phase, leading to differential die swell and parison swing when die temperature varies by more than ±5 °C. In this process the compound is let down at 25 wt% to 35 wt% into blow-moulding-grade HDPE; the lower end maintains drop impact and pinch-weld strength, while the upper end increases bio-based carbon content measurable by ISO 16620-2:2019 but narrows the melt-strength window and raises the minimum head temperature at which pinch welds fuse. Downstream production uses continuous extrusion blow moulding on a 24:1 L/D extruder with a barrier screw and an integrated 40 mm to 60 mm diverging die head; barrel set points are 150 °C to 180 °C in the feed section, 175 °C to 195 °C in the metering section, and head temperature is maintained at 175 °C to 190 °C. Resin drying at 60 °C to 65 °C for 3 h to 4 h in a desiccant dryer is mandatory, because the PLA phase hydrolyses at head residence times above 4 min if moisture is above 0.025%; pinholes form at the pinch line and are detected by ASTM D2463-15 drop-impact tests from 1.2 m on filled bottles. Mould temperature is held at 15 °C to 30 °C, blow-air pressure is set at 6 bar to 8 bar, and the blow-up ratio is kept below 3:1 because higher ratios overthin the walls and expose PLA-rich weld lines. Compliance for these components includes Regulation (EC) No 1223/2009 for cosmetic product packaging, Regulation (EC) No 1907/2006, Article 33 for SVHC notification, and ISO 16620-2:2019 for the declaration of bio-based carbon at the component level. Terminal product types are non-food personal care bottles of 250 mL to 500 mL for shampoo, body wash, and hand soap; this configuration is not used for carbonated beverage bottles because CO₂ barrier and top-load performance fall below carbonated soft-drink filling-line requirements. Published data for this specific let-down configuration is limited, and qualification must be run on the converter’s bottle geometry before line speed is fixed.

At production rates above 4,000 pieces/h, retail display hooks and shelf-edge clamps are moulded in 8- to 16-cavity cold-runner tools with a central sprue and fan gates; because the parts carry no continuous load, the main process conflict is controlling gate blush on visible side walls rather than mechanical fatigue. Transparent clamps are produced from 100 wt% virgin compound; opaque display hooks may incorporate 10 wt% to 25 wt% post-industrial regrind of the same grade, provided the bio-based carbon content is re-audited by ASTM D6866-22 if any environmental marketing claim is made. Compliance is based on 16 CFR Part 260 for bio-based claims, ASTM D6866-22 for renewable carbon measurement, and Regulation (EC) No 1907/2006, Article 33 for SVHC tracking. Downstream production on 60 t to 100 t injection presses uses melt temperature from 185 °C to 200 °C, mould temperature from 25 °C to 35 °C, and cooling time of 6 s to 8 s for a 2.5 mm nominal wall. Terminal product types are pegboard hooks, shelf-edge flag clamps, sign holders, and end-cap display brackets; mould release agents are not used because the surface must retain pressure-sensitive labels and static graphics. The regrind fraction is kept below the upper boundary when the bio-based label is required, because uncontrolled addition of petroleum-derived scrap may dilute the renewable carbon fraction below the labelling threshold.

When Toy Components Are Moulded for EN 71 Compliance

When moulding toy blocks or interlocking construction parts, the gate freeze time must be extended to compensate for the slow crystallisation of the PLA-rich phase in thick sections; premature ejection produces sink marks at the boss and increases residual stress that can cause visible stress-whitening after a 1.0 m drop onto a steel plate. The moulding formulation is 100 wt% of this compound, with colourants limited to 1 wt% to 2 wt% of heavy-metal-free masterbatch; in-house regrind is restricted to 20 wt% and must be produced from off-spec parts that have not been stored outside the resin’s drying envelope. Compliance for toy applications is anchored to Directive 2009/48/EC on the safety of toys, EN 71-1:2014+A1:2018 for mechanical and physical properties, EN 71-3:2019+A1:2021 for migration of elements, and ASTM F963-23 for the United States market; phthalates are controlled under Regulation (EC) No 1907/2006, Annex XVII entries 51/52. Production is run on hydraulic or toggle injection presses of 80 t to 120 t, with 20:1 L/D screws, barrel temperatures from 180 °C to 195 °C, and mould temperatures from 15 °C to 25 °C. Holding pressure at the boss is maintained at 40 MPa to 60 MPa for 2 s to 3 s, and because the heat deflection temperature of the PLA-rich blend is below that of unfilled HDPE, cooling time is 20% to 30% longer than conventional HDPE of the same melt flow rate. Tools use ejector sleeves around core pins, and undercuts are achieved with lifters because the material has lower elastic recovery than unfilled HDPE. Terminal product types are interlocking construction blocks, sorting toy parts, and activity centre frames; these components are not intended for teething toys or prolonged mouth-contact articles because migration testing on the pigmented grade must be completed on each cavity set under EN 71-3:2019+A1:2021 Category III limits before such use is considered.