On a single-screw sheet line fitted with a 24:1 L/D barrier screw and static mixer, Ingeo 2003D is pre-dried in a desiccant-wheel dryer with return-air dew point below −40 °C for 4–6 h at 80 °C. The resin is specified with a nominal melt mass-flow rate of 6 g/10 min at 210 °C under 2.16 kg load per ASTM D1238. Residual moisture is verified to be ≤250 ppm (0.025%) before the resin enters the feed throat. Any deviation above 300 ppm lowers melt-phase intrinsic viscosity through hydrolytic chain scission, producing intermittent gels, sheet striations, and loss of thermoforming stretch uniformity. The extruder barrel profile is typically set from feed to metering as 165–180 °C, 185–200 °C, and 200–210 °C, with a die temperature of 200–215 °C. Melt temperature measured at the die lip is held within 200–210 °C to limit lactide reformation. The melt is filtered through a 100 µm screen pack and delivered to a coat-hanger sheet die with a die gap adjusted to 0.6–0.8 mm for final rollstock thickness of 0.3–0.5 mm. A three-roll chrome stack is run at 40–60 °C on the first roll, 50–70 °C on the second roll, and 40–60 °C on the third roll to balance gloss, static dissipation, and residual stress. The sheet is wound on turret winders with decreasing tension from core to outer diameter to prevent blocking and transfer of pattern defects.

Thermoforming of this rollstock into dairy containers is constrained by the cold-crystallization onset. Surface temperature during preheat is held between 90 °C and 110 °C; above 120 °C, the amorphous sheet develops crystallinity that increases flexural modulus but narrows the draw window and produces stress-whitened corners. Plug-assist pressure forming with heated aluminum plugs is used for draw ratios up to 3:1. Female tooling is maintained at 20–30 °C using closed-circuit chillers at 10–15 °C supply to reduce cycle time. Edge trim is rejected when sheet temperature at the trim station drops below 40 °C, because fracture-induced microcracks become visible in downstream filling. Terminal articles are dairy cups, dessert pots, and single-serve cream containers in wall thicknesses from 0.25 mm to 0.45 mm. Food-contact compliance is evaluated under Regulation (EU) No 10/2011, with migration testing performed according to the intended food simulant and temperature condition. Hot-fill above 60 °C is outside the operational boundary; load-bearing distortion begins near the 55 °C heat deflection temperature measured under 0.455 MPa by ASTM D648.

Where Does the Thermoforming Window Collapse for Cold Drink Cup Walls?

Cold drink cup production from 2003D sheet uses roll-fed contact-heat or shuttle thermoformers in which the sheet is clamped and transferred continuously through a heating oven. The thermoforming window is governed by sheet surface temperature rather than oven setpoint, with contact thermocouples reading 95–115 °C at the forming station. Plug-assist is performed with syntactic foam or PTFE-coated aluminum plugs preheated to 80–100 °C to avoid chilling the sheet before draw. Mold temperature is run at 15–25 °C, and chilled water at 5–10 °C is circulated through the mold body. Draw ratios in the cup sidewall commonly reach 3:1 to 3.5:1; when the ratio exceeds 3.5:1, wall-thickness variation becomes the dominant failure mode. Published data for this specific configuration is limited, but production records at higher draw ratios often show ultrasonic wall-thickness readings below 0.18 mm in the sidewall transition region, leading to top-load buckling below commercial targets.

The terminal cup is approved only for cold-service beverages. Residual lactide in the polymer can hydrolyze slowly above 50 °C, and dimensional stability under load follows the ASTM D648 HDT of approximately 55 °C at 0.455 MPa. For cups with lid undercut profiles, the plug cavities are maintained with abrasion-resistant coatings, and the trim tool is run with 0.05–0.08 mm cutting clearance to avoid feathering. Compliance testing for food-contact cold-drink applications is performed under Regulation (EU) No 10/2011, combined with organoleptic testing after 10-day storage at 40 °C in neutral simulants. Stress-crack resistance is assessed after cases are stored under condensing conditions at 45 °C and 95% RH for 48 h. Cups made from 2003D are not suitable for hot beverage filling, microwave reheating, or dishwasher exposure above the stated HDT.

A separate cast film line configured with a 30:1 L/D single-screw extruder and a 300 mm coat-hanger die produces clear label face stock from Ingeo 2003D at melt temperatures of 200–215 °C. The die gap is set to 0.4–0.5 mm, and the air gap is held at 15–25 mm to limit neck-in and melt sag before the film contacts the chill roll. The chill roll is run at 20–35 °C with a surface roughness below 0.05 µm Ra. Film thickness for unsupported label webs is controlled between 20 µm and 50 µm with a scanning thickness gauge, and the film is corona-treated to a wetting tension above 40 mN/m per ASTM D2578 before winding. High unwind tensions are avoided because amorphous PLA film exhibits stress retention and blocking under compression; the winder uses taper tension from 60% to 30% of line tension across the roll diameter. The resulting rollstock is slit to label-face width and supplied to pressure-sensitive laminators or used as in-mold label stock in the same PLA packaging ecosystem.

The film is evaluated for tensile modulus and elongation per ASTM D882 and ISO 527-3, with haze measured by ASTM D1003 for label clarity. Surface quality is tied to melt filtration; a 200 mesh screen pack is installed upstream of the die to remove specks. The use of 2003D in cast film is limited to non-shrink label applications, because standard cast lines do not apply sufficient machine-direction orientation to develop controlled shrinkage. If transverse-direction orientation is attempted below the 60 °C roll temperature, uneven neckdown and edge-to-center caliper variation appear. Published data for this specific configuration is limited. Terminal articles include clear label face stock, in-mold labels for PLA cups, and window film used in rigid paperboard boxes where compostability of the packaging matrix is required under EN 13432.

Profile Extrusion Through a 24:1 Single-Screw Line With Vacuum Calibration

Rigid tube and display profile extrusion with Ingeo 2003D is performed on a single-screw line with a 24:1 L/D screw, compression ratio 2.5:1, and a breaker plate fitted with a 200 mesh screen. The barrel profile is set from 165 °C at the feed zone to 200–210 °C at the metering zone, with die and adapter held at 200–210 °C. The melt is delivered to a spider or crosshead die with land lengths sized to compensate for the relatively high die swell of PLA; drawdown is limited to 5–10% between die exit and calibration. Vacuum calibration is applied at −0.02 MPa to −0.06 MPa gauge inside the sleeve, and cooling water is supplied at 15–25 °C. Haul-off speed is linked to melt pressure and wall thickness feedback, with closed-loop puller controls holding short-term speed variation below ±0.5%. Tube ovality is maintained at ±0.1 mm for outside diameters up to 20 mm; thicker sections beyond 6 mm wall are cooled with internal air to avoid sink marks.

Terminal articles from this process are transparent or translucent rigid tubes, display rails, and point-of-sale trim profiles. Because PLA under load loses dimensional stability near 55 °C, profiles are not specified for continuous exposure above that threshold. Cutting at ambient temperatures below 40 °C can generate chipped edges; saw blades with fine tooth pitch and low feed force are used. Compliance for non-food profiles typically requires heavy-metal and hazardous-substance declarations under REACH and RoHS Directive 2011/65/EU. Drying before extrusion remains critical at ≤250 ppm moisture, and regrind levels above 20% can shift melt viscosity and increase die lines if the regrind is not sieved and dried separately.

In filament conversion, Ingeo 2003D is pre-dried to ≤250 ppm moisture, then extruded through a single-screw extruder with a 1.75 mm or 2.85 mm circular die at melt temperatures of 195–210 °C. The filament is quenched in a water bath at 30–40 °C, passed through a laser micrometer, and wound at controlled tension. Diameter tolerance for fused filament fabrication feedstock is held at ±0.03 mm for 1.75 mm filament and ±0.05 mm for 2.85 mm filament, with ovality checked continuously. A closed-loop winder maintains spooling tension below 0.5 N to prevent cold-drawing and diameter drift inside the spool. Melt filtration through a 100 µm screen pack is used to reduce gel defects that cause nozzle clogging at the printer side. The resulting filament has a glass transition temperature in the range of 55–60 °C by ISO 11357-2 and is not recommended for continuous service above 50 °C in printed parts.

Moisture management is the controlling parameter. At relative humidity above 60% RH, PLA filament absorbs surface moisture, and printing output develops micro-bubbles from steam evolution in the hot-end above 180 °C. Spools are packed in vacuum-sealed foil with desiccant, and redrying is performed at 60 °C for 4 h before use if seals are compromised. The processing window is narrow: extrusion temperatures above 220 °C increase lactide reformation and color drift, while temperatures below 190 °C raise melt pressure and can cause diameter fluctuation in the filament line. Terminal products are FFF feedstock for prototyping, assembly jigs, inspection fixtures, and low-load tooling. The filament is commonly specified by printer manufacturers against dimensional stability, spool tangle-free winding, and roundness rather than by print mechanical property claims alone.

Masterbatch Carrier Duties in Twin-Screw Compounding Lines

Masterbatch compounding with Ingeo 2003D as carrier is performed on a co-rotating twin-screw extruder with an L/D 32:1 configuration, side-feeder at L/D 16–20, and underwater pelletizer. The resin is dried to ≤200 ppm moisture and fed at the main throat, while pigments, slip agents, or nucleating additives are introduced through the side-feeder to limit thermal history. Barrel temperatures are controlled from 160 °C in the intake zone to 190–200 °C in the mixing zone; melt temperature is not allowed to exceed 210 °C at the die plate. Screw speed is set in the range of 250–400 rpm depending on torque limitation, with specific mechanical energy input monitored to avoid local shear heating. The carrier grade is selected because its high viscosity provides sufficient wetting of pigments, and because it avoids the PE or EVA carriers that would otherwise compromise disintegration under EN 13432 and contaminate PLA recycling streams.

Letdown ratios in sheet extrusion and thermoforming are typically 2–4%. Ratios above 5% shift the final MFR and may create screw slippage or uneven mixing in single-screw converters. The compounded pellets are used as color concentrates, nucleation masterbatches, and slip packages for PLA sheet, film, and profile extrusion. Heavy-metal restrictions are verified against REACH and RoHS Directive 2011/65/EU for pigments, and food-contact masterbatches require migration documentation under Regulation (EU) No 10/2011. The processing boundary is severe: residence time above 220 °C accelerates lactide reformation, causing plate-out on the die face and pellet yellowing. Production lines using vented barrels without vacuum should be avoided, because residual moisture above 300 ppm causes hydrolytic viscosity loss during masterbatch conversion and shifts tint strength in downstream letdown.