In the manufacture of injection-moulded lipstick caps, compact base plates and multi-piece cream jars, Luran SAN W is metered as the sole resin phase at 100 wt% virgin loading; post-industrial regrind is incorporated at up to 20 wt% for non-critical packaging because higher regrind fractions shift low-temperature impact response and raise haze above the 2.5% threshold measured on 3.0 mm plaques per ASTM D1003-21. The material is pre-dried at 80°C for 2–4 h when ambient relative humidity exceeds 60%, using a desiccant dryer with a dew point no higher than −30°C to prevent splay at the gate. Injection moulding is carried out on an all-electric toggle machine with a screw L/D ratio of 20:1 to 25:1 and a compression ratio of 2.5:1; nozzle melt temperature is set to 220–240°C, and mould temperature is maintained at 40–60°C for high-gloss surfaces. A multi-cavity hot-runner system with 16–32 drop zones and sequential valve gating is used for thin-wall caps; fill time is 0.3–0.8 s, and hold pressure is 60–90 MPa. Terminal finished product types produced in this conversion route include lipstick caps, powder compact frames, fragrance bottle shoulders, non-pressurised cream jar bodies, and outer caps for lotion pumps. Compliance for cosmetic packaging is assessed under EU Regulation (EC) No 1223/2009 Article 17 as part of finished cosmetic product safety information, EU Packaging Directive 94/62/EC Annex II for heavy metal limits in packaging, and REACH Annex XVII; if the finished article is intended for repeated contact with oily cosmetic formulations, finished-geometry migration testing under EU 10/2011 and FDA 21 CFR 181.32 is required only where the container is classified as a food-contact surrogate. The processing boundary is that stress-bearing snap-fit closures should not be combined with ester-based solvent adhesives, terpene liners, or aromatic oil fills without a stress-crazing trial; published data for this specific configuration with Luran SAN W is limited.

What Limits Regrind Loading in Multi-Cycle Food-Processor Bowl Moulding?

The limiting variable in SAN W regrind usage for thick-wall food-processor bowls is not melt flow but the migration-compliance consequence of repeated heat history. A virgin loading of 100 wt% is standard for direct food-contact parts; post-industrial regrind generated from the same moulding line is introduced at 10–20 wt% only when a lot-specific migration test under EU 10/2011 and FDA 21 CFR 181.32 confirms that the acrylonitrile monomer-specific migration limit in consolidated EU 10/2011 Annex I is not exceeded in the finished bowl geometry. The production process is injection moulding on a two-stage vented barrel with a screw L/D of 22:1 and a shot capacity 20–30% above final part weight; melt temperature at the nozzle is 230–250°C, mould temperature is 60–80°C, and wall sections are 3.0–4.5 mm. Slow injection velocity of 20–40 mm/s and hold pressure of 70–100 MPa are maintained to prevent sink marks around the metal drive hub insert; where no insert is used, a post-mould cooling fixture holds the bowl at 20°C for 10–15 s to stabilise roundness. Terminal finished product types are blender jars, food processor work bowls, juicer pulp containers, and transparent grinding bowl assemblies. Compliance for the electrical appliance assembly is assessed under IEC 60335-1 Clause 30 for heat and fire resistance, and UL 746C for polymeric parts in electrical equipment; mechanical acceptance is by ISO 178:2019 flexural modulus and ISO 179-1/1eA:2010 Charpy notched impact at 23°C. The operational boundary is that regrind loading above 20 wt% has no published migration data in this specific configuration and is not supported without three-batch stability evidence; melt temperatures above 260°C or residence times longer than 5 min must be avoided because acrylonitrile degradation can occur.

When Luran SAN W Replaces Polycarbonate in Appliance Display Lenses

A switch from polycarbonate to SAN W in display lenses is initiated for cost and alcohol-cleaner stress-cracking resistance, but it imposes a lower continuous-use thermal boundary. Injection-compression moulding is used for 2.0–2.5 mm thick lenses with a compression stroke of 0.5–1.0 mm to reduce birefringence after fill; barrel temperature is 230–250°C, and mould temperature is 70–85°C. Sequential valve gating with 4–8 drops per lens eliminates visible weld lines that otherwise appear under polarised light inspection. The formulation addition ratio is 100 wt% Luran SAN W; a UV-curable acrylic hardcoat is applied only as a post-mould surface coating with a dry film thickness of 1.0–3.0 µm, not as a melt-compounded additive. Terminal finished product types are display lenses for air-conditioner control panels, washing machine dial windows, appliance fascia covers, and push-button surrounds. Compliance is assessed under IEC 60335-1 Clause 30.2 for glow-wire ignition and flame spread, UL 94 HB at minimum part thickness, and REACH Annex XVII for acrylonitrile monomer content in articles. The key processing limitation is that continuous operating temperature should remain below 85°C; softening behaviour is monitored by ISO 306:2022 Vicat B50 and ISO 75-2:2013 method B deflection temperature, not by polycarbonate-equivalent thermal assumptions. Published data for injection-compression moulded lens stock with this specific grade is limited; lot-specific Vicat and fogging tests are recommended for air-conditioner fascia lenses.

Transparent ruler bodies, protractor frames and semi-transparent ballpoint barrels produced from Luran SAN W are injected or extruded at a virgin loading of 100 wt%, with external masterbatch at 1–3 wt% when colour is required; post-industrial scrap is restricted to 10 wt% to prevent surface streaking on polished mould surfaces. Processing on a single-screw extruder with L/D of 25:1 and melt filtration through a 150–200 mesh screen is used for 0.8–2.0 mm sheet; the sheet is then polished-stack calendered and die-cut for flat stationery, while injection moulding at 220–240°C with a mould temperature of 40–50°C is used for cylindrical barrels and caps. Terminal finished product types are transparent rulers, set squares, protractors, marker barrels, mechanical pencil bodies, and file covers. Compliance under EN 71-3:2019+A1:2021 migration of elements applies only where the stationery article is classified as a toy or used by children under 36 months; REACH Annex XVII restrictions on acrylonitrile monomer content in articles apply to the final plastic article. Mechanical acceptance of snap-fit cap features is evaluated by ISO 527-2:2012 tensile yield strength, not by product-level drop performance only.

Extrusion Blow Moulding High-Gloss Bottles for Personal Care

The use of Luran SAN W in extrusion blow moulding is limited to non-pressurised high-gloss personal-care bottles with a parison die temperature of 200–230°C and a blow pressure of 0.6–1.0 MPa. The formulation addition ratio is 100 wt% virgin; if regrind is used on the same bottle line, maximum regrind is 20 wt% and it must be dried to below 0.05% moisture content prior to extrusion to avoid lens-shaped bubbles in the sidewall. The downstream production process is continuous extrusion blow moulding with a barrier screw L/D of 24:1 and 20–50 mm diameter, a single-head die with a parison programmer, and a mould temperature of 10–20°C to set surface gloss; flash is trimmed and re-ground closed-loop. Terminal finished product types are transparent lotion bottles, shampoo and conditioner bottles, body wash containers, and overcap shells for cosmetic jars. Compliance for the container is assessed under EU Regulation (EC) No 1223/2009 Article 17, EU Packaging Directive 94/62/EC Annex II, and if the bottle is used for oral-care products, EU 10/2011 and FDA 21 CFR 181.32 must be verified by migration testing in the finished body. The operational boundary is that SAN W is not a suitable replacement for HDPE in squeezable bottle designs because the wall stiffness of SAN limits collapse recovery; sidewall stiffness is measured by ISO 527-2:2012 tensile modulus.

In laboratory diagnostic instrument covers and non-invasive housings, Luran SAN W is processed at a loading of 100 wt% virgin resin; when colour coding is required, a 1–2 wt% masterbatch based on SAN is selected to maintain gate cleanliness and avoid phase separation during high-speed injection. The production process is injection moulding on a 16–32 cavity hot-runner tool with L/D of 25:1, a melt temperature of 230–250°C, and a mould temperature of 60–80°C; fast injection speeds of 60–120 mm/s are used for thin-wall covers with 0.8–1.2 mm thickness to avoid short shots. Terminal finished product types are covers for automated analysers, transparent inspection windows, pipette tip rack bases, and benchtop instrument front panels. Compliance is assessed under IEC 61010-1 for laboratory equipment electrical safety, RoHS Directive 2011/65/EU Annex II for restricted substances, and REACH Annex XVII. The material is not intended for prolonged patient-contact medical devices; if a product is classified as a body-contact medical device component, finished-device biological evaluation under ISO 10993-1:2018 is required and is outside the resin provider’s certification scope. Mould deposits are minimised when melt temperature is below 260°C; black specks after 3,000 cycles indicate residence time in the barrel exceeds 5 min.

Thermoforming of Refrigerator Interior Trays and Door Bins Exposes Melt-Strength Boundaries

Sheet produced from Luran SAN W for refrigerator interior trays is extruded at a virgin loading of 100 wt%; regrind from trim is added at 15–25 wt% only when sheet edge trim is kept free of polyethylene film contamination during the grinding loop. The sheet line uses a single-screw extruder with L/D of 30:1, melt temperature of 240–250°C, and polished chill rolls at 60–80°C to produce 1.5–3.0 mm sheet. Thermoforming is carried out on a vacuum-forming machine with ceramic heaters, a sheet surface temperature of 120–160°C, and an aluminium mould temperature of 20–40°C; plug assist is required for deep-draw door bins with depth-to-width ratios above 0.5. Terminal finished product types are refrigerator door bins, crisper drawers, transparent shelf fronts, and freezer compartment guards. Compliance for food-adjacent surfaces is assessed under EU 10/2011 and FDA 21 CFR 181.32 if the tray is intended to store unpackaged food, with finished-part migration testing in the thermoformed shape; REACH Annex XVII and EU Packaging Directive 94/62/EC apply to packaging components. The melt-strength boundary is the key limitation: sheet sag above 5 mm on a 300 mm span during heating indicates the forming window has been exceeded, and the part will show thickness variation exceeding 20% from nominal.