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This ABC three-layer biodegradable film blowing machine produces compostable blown film from PLA, PBAT, and PLA/PBAT blends for shopping bags, produce bags, food packaging, agricultural mulch film, and industrial compostable packaging. Three independent extruders feed a co-extrusion die — enabling a three-layer structure where each layer is optimized independently: PLA for stiffness and clarity, PBAT for flexibility and tear resistance, and a functional tie/seal layer for heat-sealability. Converters supplying supermarkets, food brands, and municipalities transitioning to compostable packaging mandates run this machine for certified biodegradable film that meets EN 13432 and ASTM D6400 standards.
Compostable shopping bags: Three-layer PLA/PBAT film at 15-30 microns for supermarket and retail compostable carry bags — certified biodegradable per EN 13432, with adequate tensile strength for load-bearing and PBAT-provided tear resistance for puncture-prone contents.
Food-grade produce bags: Transparent PLA-dominant film with PBAT flexibility layer for fruit, vegetable, and bakery packaging — meets food-contact migration limits while providing the breathability produce requires.
Agricultural biodegradable mulch film: PBAT-rich three-layer film designed for in-soil biodegradation after the growing season — eliminates removal labor and disposal cost. Layer structure tuned for controlled degradation rate matching crop cycle.
Industrial compostable packaging: Heavy-duty compostable sacks and mailer film for e-commerce, organic waste collection, and industrial product packaging where conventional PE is being phased out by regulation.
Application vs. Recommended Machine Configuration
Application | Material Structure | Film Gauge | Typical Output |
|---|---|---|---|
Compostable shopping bags | PLA skin / PBAT core / PLA skin | 15-25 μ | 80-120 kg/h |
Food produce bags | PLA outer / PBAT middle / seal layer inner | 12-20 μ | 70-100 kg/h |
Agricultural mulch film | PBAT-dominant three-layer with degradation control | 12-25 μ | 100-150 kg/h |
Industrial compostable packaging | PBAT-rich core / PLA-reinforced skins | 30-60 μ | 90-130 kg/h |
Converters entering regulated compostable packaging markets where EU Directive 2019/904 (SUP) and national plastic bans mandate biodegradable alternatives for shopping bags, produce bags, and single-use packaging. Three-layer co-extrusion enables certified compostable film structures that monolayer lines cannot achieve with the same mechanical properties.
Producers running both PLA-dominant and PBAT-dominant formulations on the same line. Each ABC extruder has independent temperature control (±1°C) and screw geometry — PLA runs at 155-170°C with a low-compression screw, PBAT at 130-150°C with a medium-compression screw, and the tie/seal layer at its own optimized setpoint. Recipe switching between PLA-heavy and PBAT-heavy structures is an HMI selection, not a hardware change.
Manufacturers needing documented biodegradation certification for their film products. Three-layer precision control ensures the final film composition stays within the certified formulation window batch after batch — critical when your customer's compostability claim depends on your film meeting the same EN 13432 or ASTM D6400 spec that was originally certified.
Shops transitioning from conventional PE blown film who need a machine designed for the thermal sensitivity and shear sensitivity of biopolymers. Standard PE extruders with high-compression screws and long melt paths degrade PLA into brittle, unsellable film. This machine's low-shear screw geometry and short melt path preserve molecular weight through the extrusion process.
Producers running exclusively conventional PE, PP, or non-biodegradable polymers. This machine is purpose-engineered for biodegradable materials with specialized low-shear screws and narrow temperature control. For conventional polyolefin film, a standard ABA film blowing machine or monolayer machine costs less and runs faster.
Shops producing under 500 tons of biodegradable film per year. The ABC configuration's premium over a mono or two-layer biodegradable line pays back only when the three-layer structure commands a price premium or when independent layer control prevents a recurring quality failure. For low-volume compostable film, a two-layer biodegradable line is the better entry point.
Operations without access to climate-controlled raw material storage. PLA and PBAT pellets absorb moisture rapidly in humid environments — processing undried material produces hydrolytic degradation and film full of bubbles. If your factory cannot maintain pellet storage below 40% RH or lacks a dehumidifying dryer system, start with material handling infrastructure before investing in the extrusion line.
Manufacturers whose customers do not require third-party compostability certification. If your market accepts "oxo-degradable" or uncertified claims, the precision control of this ABC machine is beyond what you need. This machine serves the certified compostable market where EN 13432 or ASTM D6400 compliance is a purchase requirement, not a marketing claim.
Not sure if ABC three-layer is the right biodegradable film configuration? Send us your target film structure and we'll confirm within one business day:
Your target film structure (which polymers in which layers)
Required film gauge and width, and monthly volume
Which compostability certification your market requires (EN 13432, ASTM D6400, other)
Each of the three extruders operates at its own barrel temperature profile, independently controlled within ±1°C accuracy. PLA degrades rapidly above 170°C — a 5°C overshoot turns melt into brittle scrap within minutes. PBAT processes optimally at 130-150°C but degrades above 160°C. On a single-extruder machine, the compromise temperature degrades one polymer or under-processes the other. ABC independent control eliminates this — PLA at 160°C, PBAT at 140°C, simultaneously.
Screw compression ratio is designed for shear-sensitive biopolymers — typically 2.2:1 to 2.5:1 versus 3.0:1 to 3.5:1 for PE screws. High shear in a standard PE screw raises melt temperature through viscous dissipation — even when barrel heaters are at setpoint, the screw can push local melt 15-20°C above at the flight tip. Our low-shear design limits viscous heating to under 8°C above setpoint, keeping the melt within the polymer's thermal stability window.
The extruder barrel is shorter than a standard PE extruder — reducing total residence time to 2-4 minutes versus 5-8 minutes in a conventional machine. Biopolymer degradation is a function of time-at-temperature. Every extra minute above 160°C reduces PLA's intrinsic viscosity and film tensile strength. Shortening the melt path by 40% increases the safe operating margin — the polymer exits the die before degradation kinetics accumulate.
Free material trial — send us your PLA/PBAT resin, receive film samples and process data. We'll run your material on our demo line and provide:
Film samples at 2-3 gauge targets from your specified layer structure
Tensile strength and elongation data per ASTM D882
Melt temperature log demonstrating thermal stability throughout the run
Video of the trial so you verify processing stability
No cost. You supply the resin and pay freight in. We cover everything else. Arrange your material trial here.
PLA film turning brittle mid-run — no alarm, no indication, just scrap. When melt temperature creeps 8-10°C above the PLA degradation threshold due to screw shear heating, the film looks normal coming off the line but shatters during slitting or bag conversion 48 hours later. The operator sees no visible change. ABC independent temperature control with low-shear screws and real-time melt temperature monitoring at each extruder outlet prevents the silent creep into degradation territory. If melt temperature approaches the safety limit, the control system alarms before material is damaged.
PBAT/PLA layer ratio drifting during a production run. On machines without individual melt pumps, layer ratio shifts as screw wear changes back-pressure or as pellet bulk density varies between batches. A compostable bag certified at 70/30 PBAT/PLA that drifts to 60/40 mid-run may fail tensile testing at the customer's QC — even though the film "looks the same." Per-extruder melt pumps with closed-loop rpm control hold layer ratio within ±1.5% of setpoint across the entire production run.
Moisture-related bubble instability in humid season. PLA and PBAT pellets absorb moisture in humid factory conditions (common in coastal regions during rainy season). Undried material hydrolyzes in the extruder — producing steam bubbles that destabilize the blown film bubble and create pinhole defects. Integrated dehumidifying dryers before each hopper are standard — not an optional add-on.
Certification body requires batch-to-batch process consistency data. When your customer's compostability certifier (TÜV, DIN CERTCO, BPI) audits your production, they need evidence that every batch was processed within the same temperature window, layer ratio, and output rate as the originally certified sample. The ABC machine's PLC logs all process parameters per batch — temperature profiles, screw rpm, melt pump rpm, haul-off speed, and IBC pressure — exportable as PDF for audit submission.
Production Scenarios and Recommended Configurations
Scenario | Material | Typical Output | Recommended Config |
|---|---|---|---|
Compostable shopping bag film (certified EN 13432) | PLA/PBAT/PLA 15-25 μ | 80-120 kg/h | ABC 3-layer, low-shear screws, IBC, dehumidifying dryers, corona treater |
Agricultural biodegradable mulch (in-soil degradation) | PBAT-dominant 12-20 μ | 100-150 kg/h | ABC 3-layer, enhanced PBAT screw, IBC, auto die, 1500-2500 mm width |
Food-grade produce/fruit bag film | PLA skin / seal layer 12-20 μ | 70-100 kg/h | ABC 3-layer, food-grade contact materials, oscillating haul-off, slitting station |
Industrial compostable packaging (e-commerce, organics collection) | PBAT/PLA/PBAT 30-60 μ | 90-130 kg/h | ABC 3-layer, heavy-duty winder, IBC, automatic gauge control |
Material drying: PLA and PBAT pellets pass through integrated dehumidifying dryers before each hopper — reducing moisture below 100 ppm to prevent hydrolytic degradation.
Independent melting: Three extruders with low-shear screws melt PLA at ~160°C, PBAT at ~140°C — each within ±1°C of setpoint.
Melt metering & co-extrusion: Melt pumps meter precise layer volumes into the spiral mandrel die. Layer ratio is controlled by pump RPM — adjustable per recipe.
Bubble formation & cooling: The three-layer melt tube exits the die and inflates. IBC and dual-lip external air ring cool from both sides — critical for thin-gauge biodegradable film stability.
Collapsing & haul-off: The stabilizing cage guides the bubble into the collapsing frame. Oscillating haul-off distributes gauge variation uniformly.
Winding & process logging: Surface winder with tension control. PLC logs process parameters per batch for certification audit trail.
Available Options and When They Add Value
Option | What It Does | Suited For |
|---|---|---|
Integrated dehumidifying dryers | Hot-air desiccant dryers mounted before each hopper — reduces pellet moisture below 100 ppm | All PLA/PBAT production; mandatory in humid climates. Standard on this machine |
Melt temperature monitoring per extruder | Real-time melt thermocouple at each extruder outlet with alarm interlocks | Certified compostable film where process audit trail is required |
PLC process data logging & export | Logs temperature, rpm, pressure, and layer ratios per batch — exportable PDF | Producers submitting to TÜV, DIN CERTCO, or BPI certification audits |
Internal Bubble Cooling (IBC) | Dual-side cooling for improved output and bubble stability on thin-gauge film | Film below 20 microns; output targets above 80 kg/h |
Oscillating haul-off | 360° rotating nip assembly distributes gauge variation evenly around the roll | Film destined for printing or slitting where roll flatness is critical |
Corona treater (inline) | Treats film surface to raise dyne level for printing ink adhesion | Printed compostable bags and packaging where ink adhesion is required |
Automatic gauge control | Closed-loop die bolt adjustment from online thickness gauge feedback | Wide-web above 1500 mm where material giveaway affects margin on expensive PLA/PBAT resins |
Location: Bologna, Italy — compostable packaging converter
Machine: ABC Three-Layer Biodegradable Film Blowing Machine, IBC, melt pumps, 1800 mm die
Film product: PLA/PBAT/PLA compostable produce bags, 18 microns, EN 13432 certified
Before: Modified monolayer PE extruder with PLA/PBAT dry blend. Output: 55-65 kg/h. Reject rate 12%. Two certification batch failures in 18 months.
After: ABC three-layer line. Output: 95-110 kg/h. Reject rate under 3%. Zero certification failures in 24 months. PLC process logs accepted by TÜV auditor as batch compliance evidence.
Payback: 19 months from output increase, reject reduction, and avoided re-certification costs.
15+ years manufacturing blown film equipment in Jiangyin, Jiangsu — biodegradable machines running in Europe, Southeast Asia, and South America.
CE-certified electrical and safety systems on all export machines. Each ships with wiring diagrams, PLC backup, and spare parts catalog.
Pre-delivery FAT on every machine: We run your PLA/PBAT formulation at production speed before crating. Test data and video provided before dispatch.
2-year warranty on main drives, 1 year on electrical. Critical spares stocked — shipped within 48 hours of diagnosis.
Remote video-guided commissioning as standard; on-site engineer available. Training covers biodegradable material handling, recipe setup, degradation prevention, and certification documentation.
PLA, PBAT, PBS, PHA, and starch-based biodegradable compounds in any three-layer combination. Typical structures: PLA/PBAT/PLA for compostable shopping bags; PBAT/PLA/seal-layer for food packaging. Not suitable for conventional PE, PP, or non-biodegradable polymers — the low-shear screws are optimized for biopolymers and would under-process polyolefins.
At 18 microns PLA/PBAT/PLA with 1200 mm lay-flat: 80-110 kg/h sustained. At 25 microns: 100-130 kg/h. Output on biodegradable film is inherently lower than PE because processing temperatures must stay within narrow windows — pushing speed raises melt temperature and risks degradation. We provide output estimates for your specific formulation during pre-sale review.
Three measures: (1) low-shear screw limits viscous heating to under 8°C above setpoint; (2) short melt path reduces residence time to 2-4 minutes; (3) real-time melt temperature monitoring with alarm interlocks at each extruder outlet. If temperature approaches the degradation threshold, the system alarms before material is damaged — unlike standard extruders where degradation is only found in QC after the run.
Integrated dehumidifying dryers before each hopper are standard — reducing pellet moisture below 100 ppm. Undried material causes hydrolytic degradation, steam bubbles, pinhole defects, and molecular weight loss in PLA. The dryers run continuously with closed-loop dew-point control.
Standard: 45-60 working days. Custom die sizing: 60-75 days. Sea freight: Europe 25-30 days, Southeast Asia 7-10 days, South America 25-35 days.
Target film structure (polymers, layer ratios), lay-flat width and gauge range, target output, and compostability certification standard (EN 13432, ASTM D6400, other). Share polymer grade datasheets with TGA and MFI data for screw design optimization.
The machine is purpose-engineered for biodegradable polymers. Running PE would require screw changes and temperature reconfiguration — impractical for frequent switching. If you need both, consider separate machines or discuss modular screw configuration during quotation.
Training covers: material handling and moisture management, recipe setup for PLA/PBAT, melt temperature interpretation, degradation warning signs, and certification documentation. Delivered to operators and maintenance staff separately. Written SOPs in English. Free refresher within warranty.
Tell us your film requirements — we'll configure and quote within 3 working days.
Target film structure (which polymers in which layers, approximate ratios)
Required lay-flat width and gauge range (microns)
Target output: kg/h or tons/month
Compostability certification standard (EN 13432, ASTM D6400, other)
Polymer grade datasheets if available — TGA and MFI data help optimize screw design
Factory electrical supply and floor dimensions (L×W×H)
