INZEA F10 Flexible Home Compostable Film Polylactic Acid is a polylactic acid-based thermoplastic compound formulated for blown and cast film extrusion in short-shelf-life packaging, compost caddy liners, produce bags, bread bags, and light carrier bags where the finished article must fragment and biodegrade in home composting conditions. The F10 designation identifies the flexible film extrusion member of the INZEA product line, rather than a rigid injection moulding grade. The base polymer is polylactic acid with a proprietary flexibility-modifying additive package; the compound is not a starch-based film and does not share the moisture sensitivity profile of thermoplastic starch compounds. Incoming pellets are specified at a moisture content no greater than 250 ppm. Before extrusion, the manufacturer-prescribed drying condition is 80 °C for 4 h in a desiccant dryer with a dew point no higher than -40 °C. Melt flow rate is measured under ISO 1133-1:2022 at 190 °C with a 2.16 kg load; solid density is determined under ISO 1183-1:2019. The current certificate of analysis carries lot-specific values, and those values supersede generic product literature for process setup.

Applications are concentrated in monolayer blown-film structures, although cast film and lamination are technically feasible. The material is used where a home compostable end-of-life claim is specified by the retailer or waste collector. Conversion lines should be configured with closed resin conveying and hopper dryers because moisture regain after drying is a significant process variable. For printed film, corona treatment is normally required before flexographic or digital water-based ink application; the treatment level must be re-qualified on the final film because surface energy decay depends on storage humidity, additive bloom, and film crystallinity.

What stabilizes bubble geometry during INZEA F10 blown-film extrusion?

On a conventional three-zone single-screw extruder with a length-to-diameter ratio of 30:1 or 33:1 and a barrier screw with mixing elements, INZEA F10 requires a barrel temperature profile that rises from 30 °C to 40 °C at the feed throat to 160 °C to 175 °C in compression and metering zones. The die zone is commonly held at 175 °C to 185 °C; excursions above 200 °C increase the random chain-scission rate of polylactic acid and generate gel particles. The die gap is set from 0.8 mm to 1.2 mm, and the blow-up ratio is kept between 2.0 and 3.0 to control transverse tear anisotropy. Frost line height is adjusted so that the ratio of free-standing melt length to die diameter remains between 1.5 and 4.0; lower values produce excessive cooling stress, while higher values destabilise the bubble because PLA melt strength is lower than that of LDPE at equivalent melt temperature. Film thickness uniformity is monitored on-line with a capacitance or near-infrared gauge, and a stable bubble is normally observed when thickness variation remains below ±5% across a full reel. Published production data for INZEA F10 on specific high-output lines with internal bubble cooling is limited; processors using internal bubble cooling report bubble flutter unless exhaust air temperature is maintained below 25 °C and dew point below 0 °C.

Representative values for INZEA F10 flexible film are summarised in Table 1. The values are compiled from manufacturer product literature and are not batch-release specifications; the certificate of analysis is the controlling document for acceptance testing.

Material specifications and the test standards governing compostability claims

Compostability claims for INZEA F10 must be evaluated at the final-article level, not on the resin alone. For home composting, the reference standard is EN 17427:2022, which includes characterisation, biodegradation under home compost conditions, disintegration, and ecotoxicity; TÜV Austria’s OK compost HOME and DIN CERTCO home compostable certification are typical third-party routes. The industrial compostability route follows EN 13432:2000, with biodegradation under ISO 14855-1 or ISO 14855-2, disintegration under ISO 16929 or ISO 20200, and an ecotoxicity test with higher plants. Compostable certification under EN 13432:2000 requires a minimum of 90% biodegradation, measured as carbon dioxide evolution relative to a positive reference within a maximum test duration of 6 months. Home compost protocols allow lower mesophilic temperatures and may extend the observation window; a material certified for industrial composting is not automatically certified for home composting because disintegration at 58 °C does not predict disintegration in a domestic bin operating between 20 °C and 30 °C at the exterior and possibly 40 °C to 45 °C in the core. Published data for INZEA F10 in anaerobic digestion, freshwater, or marine degradation matrices is limited; those end-of-life pathways should not be claimed from home compost certification alone.

Where a converter evaluates INZEA F10 against low-density polyethylene or PBAT-rich compostable films, the first-order differences are density, elongation at break, modulus, barrier profile, and heat-seal behaviour. LDPE film in 50 µm gauge has a density below 0.930 g/cm³; INZEA F10 is approximately 25% denser, which reduces area yield per kilogram and must be entered into packaging cost-per-unit calculations. PBAT-rich compostable films typically display higher elongation at break and lower tensile modulus than PLA-based films; INZEA F10 trades some ultimate strain for a higher modulus, which may support down-gauging in applications where stiffness limits machinability. Table 2 is a directional engineering comparison, not a specification; final values shall be verified on the target film structure because additives, thickness, orientation, and lamination alter properties.

When replacement of LDPE triggers shelf-life and sealing revisions

Substituting INZEA F10 for LDPE in a vertical form-fill-seal line changes the thermal seal response, hot-tack window, and barrier shelf-life. Seal initiation temperature for PLA-based flexible films is frequently lower than that of LDPE, but the hot-tack plateau is narrower; therefore jaw temperature, dwell time, and seal pressure settings must be re-derived on the target material rather than transferred from LDPE. Heat seal strength is tested under ASTM F88/F88M or ISO 527-3; hot-tack is tested under ASTM F1921/F1921M. Oxygen transmission rate is measured by ISO 15105-2 and water vapour transmission rate by ISO 15106-3 on the finished film or laminate. PLA-based films typically present lower oxygen barrier and higher water vapour permeability than LDPE, which modifies the equilibrium modified-atmosphere condition in respiring produce packs. Shelf-life trials should be conducted at 23 °C and 50% RH with actual product fill weight; if the package is refrigerated, barrier data must be collected at the lower use temperature because oxygen and carbon dioxide permeability shift with temperature and moisture. For applications requiring a moisture barrier, INZEA F10 may require a compostable barrier coating or lamination; the addition of a barrier layer must be re-tested for home compostability because the final article is no longer monolayer.

Processing limitations include moisture regain and additive compatibility. After drying, pellets exposed to 60% RH ambient air for more than 30 min can begin to re-adsorb moisture; re-drying is required if the material is not consumed within a closed conveying system or hopper dryer. Free water above 250 ppm at melt temperatures above 180 °C drives hydrolysis, reducing molecular weight and producing viscosity loss, gel particles, and black specks. The compound should not be purged with conventional polyolefin purge concentrates containing amine-based additives or zinc stearates; these may catalyse chain scission in PLA. A low-melt-flow PLA or manufacturer-approved purge grade is recommended when transitioning from polyolefins. Colour masterbatches and slip or anti-block concentrates must be certified compostable under EN 13432:2000 or EN 17427:2022 for the final film to retain its home compost claim; loadings above 10 wt% of an additive masterbatch may shift tensile properties enough to breach the qualified film specification even if the masterbatch itself is certified. Residence time in adapters, screen changers, and die lips should be kept below 8 min at 175 °C to 185 °C because longer heat history promotes branching, gel formation, and plate-out on polished chrome rolls. Coextrusion with PBAT, thermoplastic starch, or other biopolymers requires separate migration, seal strength, and disintegration testing, because the tie-layer interface can alter both mechanical failure mode and compost fragmentation.