How does EN 17033:2018 govern the soil-contact window for Bio-Flex N 21310 mulch film?

Compliance standard for soil-biodegradable mulch film is EN 17033:2018, which in Clause 4.2 requires 90% ultimate soil biodegradation relative to microcrystalline cellulose within 24 months under ISO 17556:2019 at 25 °C ± 2 °C, and Clause 4.3 requires an earthworm acute toxicity test according to ISO 11268-1:2012, plus a plant emergence test according to OECD 208:2006. Formulation addition ratio: 100% Bio-Flex N 21310 as supplied is used for 15–25 µm black mulch on a 45 mm single-screw extruder with L/D 30:1 and a 250 mm spiral mandrel die; where perforated field trials record dart impact failure below 350 g under ISO 7765-1:2018, 20–30 wt% PBAT is blended in the hopper with 2–3 wt% carbon black masterbatch to maintain opacity. Downstream production process: the compound is pre-dried at 80 °C for 4 h in a desiccant dryer to a dew point of −40 °C and moisture below 250 ppm, then extruded at a melt temperature of 168–175 °C with die zone 165 °C, die gap 0.8 mm, blow-up ratio 2.8:1, layflat width 1,100 mm, and frost line height 850–900 mm; in-line perforation at 300 mm spacing for drip irrigation produces holes 8 mm diameter. On a production line, die-lip deposit formation becomes visible after 72 h when hopper moisture exceeds 300 ppm; melt pressure above 180 bar and bubble flutter at the frost line are early process failures requiring a shutdown to purge degraded PLA oligomers. Terminal product types: black and white co-extruded soil-biodegradable mulch films, 12–25 µm thickness, in 1.2 m and 1.5 m rolls. Published data for Bio-Flex N 21310 in the precise 12 µm black mulch configuration is limited; the following table characterises PLA/PBAT blown-film behaviour reported in peer-reviewed agricultural film studies using the same ISO test methods.

For household organic waste separation, the 18–25 µm blown film is converted into bottom-sealed gusseted caddy liners where certification under EN 13432:2000/AC:2005 and ASTM D6400-21 requires ≥ 90% biodegradation of the organic carbon fraction within 180 days at 58 °C ± 2 °C under controlled composting, and disintegration must leave no more than 10% of original dry mass on a 2 mm sieve after 12 weeks under ISO 16929:2021. Formulation addition ratio: 75–85 wt% Bio-Flex N 21310 with 15–25 wt% PBAT is typical when the 7-day wet waste puncture test shows failure below 1.5 J under ISO 527-3:2018; 1.5–3.0 wt% of a slip/antiblock masterbatch is added to prevent blocking on the winder. Downstream production process: a 50 mm single-screw extruder with L/D 28:1 and a 200 mm mono-layer die runs at melt 165–172 °C, die gap 0.6 mm, BUR 3.2:1, and film gauge 18 µm; in-line perforation at 4–6 mm diameter spaced 50 mm provides air exchange; bag conversion uses constant-heat seal bars at 115–125 °C with 0.3 s dwell and a gusset width of 8–12 cm. Field data from municipal caddy liner production show that moisture above 250 ppm in the compound causes bubble tears at the frost line and lactide deposits on the die face; operators must set the winder contact pressure below 1.2 bar to avoid blocking when the film temperature at the collapsing frame exceeds 38 °C. Polyethylene contamination above 2 wt% causes melt fracture, translucency defects, and non-compostable fragments under EN 13432. Terminal product types: 5 L, 10 L, 20 L, 30 L and 120 L municipal organic waste bags, vented caddy liners, and compostable bin liners.

When a 22 µm retail carrier film must meet EU Packaging Directive 94/62/EC and EN 13432

Compliance standard for printed retail carrier film is EU Directive 94/62/EC Annex II for heavy metal limits (sum of Pb, Cd, Hg, Cr(VI) < 100 mg/kg) and EN 13432:2000/AC:2005 for industrial compostability; US-bound shipments require ASTM D6400-21 and 16 CFR Part 260 for environmental marketing claims. Formulation addition ratio: 100% Bio-Flex N 21310 is used with 2–5 wt% pigment/antiblock masterbatch for colours; when the carrier bag must hold 12 kg for 20 minutes without handle tear, 10–15 wt% PBAT is added and film gauge increases from 22 µm to 30 µm. Downstream production process: the film is blown on a 55 mm extruder with L/D 30:1, die gap 0.8 mm, BUR 3.0:1, then corona treated to 42–46 mN/m for flexo ink adhesion; conversion includes bottom seal, side gussets, and die-cut handle holes, with heat sealing at 110–125 °C and a dwell of 0.25–0.40 s. Melt temperature above 190 °C causes handle-hole stress cracks after storage at 50% RH; static charge above 5 kV at 35% RH causes double sheets, requiring 0.5 wt% antistat masterbatch. Terminal product types: retail carrier bags, boutique shopping bags with soft-loop handles, and promotional film bags.

Root-zone temperature maintenance in horticultural propagation tunnels imposes a 9–18 month above-ground service conflict with the 24-month soil degradation window of EN 17033:2018; for Bio-Flex N 21310, the 25 µm perforated floating film is laid over hoops where the standard's mechanical property provisions for tensile strength above 18 MPa and elongation above 180% under ISO 527-3:2018 remain the key acceptance thresholds. Formulation addition ratio: 100% Bio-Flex N 21310 is used for 3–6 month seed-starting film; for winter propagation exceeding 6 months, 1–2 wt% of a non-azo UV stabilizer masterbatch is added, and 20 wt% PBAT is introduced when 12 × 15 cm root-training pouches must withstand root pressure without splitting. Downstream production process: a 45 mm extruder with L/D 25:1 and a 150 mm die runs at melt 165–170 °C, die gap 0.7 mm, BUR 3.0:1, with in-line perforation holes of 2 mm at 40 mm spacing for aeration; root-pouch fabrication uses a rotary heat sealer at 118 °C and 0.5 s dwell to create non-wicking seams. Terminal product types: propagation tunnel film, nursery root-pouch sleeves, seed-starting strips, and biodegradable plant propagation bags.

Dry goods secondary packaging: seal initiation, three-layer die geometry, and compostability stack emissions

Compliance standard for dry goods secondary packaging is EN 13432:2000/AC:2005 for industrial compostability plus EU No 10/2011 for overall migration below 10 mg/dm² where the film directly contacts food; non-food dry goods packaging must still comply with REACH Article 33 communication if SVHC content exceeds 0.1 wt%. Formulation addition ratio: 80–90 wt% Bio-Flex N 21310 with 10–20 wt% PBAT or thermoplastic starch is used to lower seal initiation temperature to 105–115 °C and raise dart impact above 250 g under ISO 7765-1:2018; 1–3 wt% of an antiblock masterbatch and 0.5–1 wt% slip reduce blocking on the winder. Downstream production process: three-layer A/B/A co-extrusion on a 60 mm line with L/D 30:1 places the slip/antiblock masterbatch in the 4 µm skin layers and the reground edge trim up to 30 wt% in the 17 µm core layer; die gap is 0.9 mm, BUR 2.8:1, and melt temperature is 168–175 °C. Published data for Bio-Flex N 21310 in three-layer A/B/A dry goods packaging film is limited; converter trials should validate seal initiation temperature under ISO 527-3:2018 and static heat seal strength under ASTM F88/F88M-20 before committing to high-speed bag machinery. Amine-based masterbatch carriers accelerate ester bond scission in the PLA phase and must be excluded. Terminal product types: transparent dry goods bags, apparel polybags, hardware pouches, and compostable e-commerce mailers.

Where municipal collection of pet faeces must meet home compostability, the 12–18 µm blown film is converted into 250 mm × 300 mm mini-rolls with perforated tear lines and a bottom star-seal that must withstand a 1.0 kg pull force at the seal when tested under ASTM F88/F88M-20. Compliance standard: the pet waste bag must meet EN 13432:2000/AC:2005 or NFT 51-800:2015 for home compostability, with the latter requiring ≥ 90% disintegration within 180 days at ambient home composting temperatures; if certified under ASTM D6400-21, the marketing claim must specify industrial composting conditions. Formulation addition ratio: 70–80 wt% Bio-Flex N 21310 plus 20–30 wt% PBAT is used to prevent puncture from paw pressure, and 1–2 wt% of a process lubricant masterbatch is added to reduce melt fracture at 18 µm gauge. Downstream production process: the film is extruded on a 40 mm single-screw extruder with L/D 25:1 at melt 165–172 °C, die gap 0.5 mm, BUR 3.5:1, then converted on a rotary bag machine with photoelectric registration at 300 bags/min; a dwell of 0.2 s at 120 °C seals the star bottom without pinholing. Terminal product types: home-compostable dog waste bags, pet litter liners, and diaper disposal bags.