High-Speed Four Head Film Blowing Machine for HDPE & LDPE Production

Applications

This four-head film blowing machine produces multi-layer HDPE and LDPE blown film for construction sheeting, agricultural greenhouse film, geomembrane liners, heavy-duty industrial bags, and packaging requiring tensile strength with tear resistance. Four extruders feed a single die head — layering HDPE for stiffness and LDPE for flexibility — producing film from 20 to 200 microns at widths from 800 mm to 4000 mm lay-flat. Converters in construction, infrastructure, agriculture, and heavy packaging run this machine for high-output, wide-width production where single-extruder lines cannot deliver the required gauge control.

• Construction film / vapor barrier: Wide-width HDPE/LDPE film at 80-200 microns for under-slab moisture barriers, temporary enclosures, and concrete curing covers. Four-head configuration stabilizes wide-web bubble formation where single-extruder machines struggle with gauge variation above 2000 mm width.

• Agricultural greenhouse film: Multi-layer film combining HDPE for rigidity with LDPE/EVA for light transmission and anti-drip properties — produced at 1500-3000 mm lay-flat width.

• Geomembrane liner: Thick HDPE film (1.0-2.0 mm) for landfill liners, pond lining, and mining containment. Four extruders supply the melt volume for heavy-gauge production without surging.

• Heavy-duty industrial bags / FIBC liner: Multi-layer film for cement bags, fertilizer sacks, and bulk container liners requiring puncture resistance and flexibility in the same structure.

• Stretch hood / pallet wrap film: Multi-layer blown stretch film with optimized cling and strength layers for logistics applications.

Application vs. Recommended Machine Configuration

Who This Machine Is For

• High-volume blown film converters producing 2000+ tons per year who need consistent wide-web output across 24-hour operation. Four-extruder configuration supplies uninterrupted melt to the die — no surging, no gauge banding — maintaining ±5% thickness tolerance across 3000 mm+ lay-flat widths.

• Producers running both HDPE and LDPE film on the same line who switch between rigid HDPE-heavy structures and flexible LDPE-dominant recipes. Each extruder has independent temperature control — changeover between product types happens via recipe selection on the HMI, not hardware swaps.

• Manufacturers serving regulated construction and infrastructure markets where film must meet ASTM or EN standards for tensile, elongation, and puncture. Multi-layer co-extrusion places strength layers precisely where needed — unlike monolayer film where one material must perform all functions.

• Shops replacing multiple aging single-extruder lines with one four-head machine. One four-head line at 300 kg/h replaces roughly 3-4 older monolayer machines at 80-100 kg/h each — lower total labor, less floor space, and better gauge uniformity between shifts.

• Export-oriented film producers supplying customers across different climate zones — the four-head structure allows film formulation adjustment per batch based on destination market requirements.

Who Should NOT Buy This Machine

• Shops producing under 800 tons of film per year. A four-head machine's minimum economic run rate is roughly 150 kg/h — below that, the capital premium over a two-head or monolayer line does not pay back within a typical 3-year window. For lower volumes, see our ABA film blowing machines or monolayer film blowing machines.

• Producers making exclusively narrow-width film (under 500 mm lay-flat). While the machine can run narrow widths, the die and air ring are sized for wide-web production — running consistently at a small fraction of die diameter creates edge-bead waste and uneven cooling. For narrow specialty film, a smaller die machine is more cost-effective.

• Startups without experienced blown film operators. Four-extruder co-extrusion requires understanding of melt temperature profiling, layer ratio control, and bubble stabilization across a large die. The learning curve is steep. If your team is new to blown film, start with a simpler machine and graduate to four-head after 12-18 months.

• Operations running exclusively bio-compostable or highly heat-sensitive materials. While the machine can process some biodegradable grades, the four-head melt path is longer than a single-extruder setup — increasing residence time. For PLA/PBAT films, a dedicated biodegradable film blowing machine with low-shear screw geometry is the safer choice.

Not sure if four-head fits your production? Send us three data points and we'll recommend the right extruder configuration within one business day:

• Your target film structure (layers, polymers)

• Required lay-flat width and typical gauge

• Target daily output in kg per shift

Send your production data here.

Technical Advantages

Four Independent Extruders — Independent Material and Temperature Control per Layer

Each extruder runs its own barrel temperature profile, screw speed, and material feed — independently optimized for the polymer assigned to that layer. On a monolayer line, one extruder processes whatever blend enters the hopper; if HDPE needs 190-210°C and LDPE processes optimally at 160-180°C, the compromise degrades one material. With four independent extruders, each polymer processes at its optimal window — eliminating the gel specks and unmelt particles common in single-extruder HDPE/LDPE blends.

Multi-Layer Gauge Control — ±5% Across 3000 mm+ Lay-Flat Width

Individual melt pumps per extruder meter precise melt volume into the co-extrusion die, with automatic die bolt adjustment responding to thickness sensor feedback in real time. On wide-web monolayer film, gauge variation at the edges commonly reaches ±12-15% due to uneven melt distribution across a large die diameter. Four-head co-extrusion with layer-specific melt pumps and automatic die gap control holds gauge tolerance at ±5% across the full web width. For a construction film converter selling by the square meter, a 7% gauge improvement at 300 kg/h recovers roughly 20 kg of polymer per hour that would otherwise ship as overweight film.

Internal Bubble Cooling (IBC) — Output at 250-450 kg/h Sustained

A dual-lip air ring combined with internal bubble cooling exchanges air inside the bubble through a closed-loop system — cooling from both sides simultaneously. On a monolayer machine with external-only cooling, the film must shed all heat through the outer bubble surface, creating a hard ceiling around 120-150 kg/h for HDPE at 50 microns. IBC removes heat from the inside surface, doubling the effective cooling area and enabling sustained output of 250-450 kg/h — the limitation shifts from cooling to extruder capacity. For 80-micron HDPE construction film at 3000 mm width, expect 300-350 kg/h without bubble instability.

Oscillating Haul-Off — Flat, Uniform Rolls Without Gauge Bands

The haul-off nip assembly rotates 360° continuously, distributing residual gauge variation across the full roll width instead of concentrating it in one band. Fixed-nip machines build up thickness bands at specific points — causing puckering, registration drift in downstream conversion, and "tight"/"loose" spots when the customer unwinds. Oscillating haul-off spreads gauge variation evenly around the roll circumference, producing flat rolls that unwind smoothly for printing, slitting, or bag making. This directly affects downstream conversion yield.

Free film structure analysis — send us your target film specification, get back a recommended layer configuration. We'll provide:

• Recommended 4-layer structure with suggested layer ratios

• Estimated output rate at your target film width and gauge

• Energy consumption estimate per kg of finished film

No cost. Pre-sale engineering review to confirm machine fit before quoting. Send your film spec here.

Real Production Issues It Solves

Gauge bands showing up after the customer slits the roll. Fixed-position haul-off creates a "hard spot" where gauge thickens at one rotation position. The slitter picks this up as inconsistent tension — some slit rolls tight, others loose. Oscillating haul-off distributes gauge variation through 360° rotation. Your customer's slitting line sees consistent tension across all positions.

Summer output drop from cooling limitation. When cooling tower water runs 5-8°C warmer in summer, external air ring efficiency drops and operators slow the line. With IBC providing half the total cooling from inside the bubble (unaffected by ambient temperature), the output drop is under 8% compared to 20-25% on external-cooling-only machines.

HDPE/LDPE blend inconsistency between batches. Dry-blending pellets in a single hopper causes segregation — LDPE-rich at start, HDPE-rich at end. Four-head co-extrusion feeds each polymer through its own extruder. Layer composition is set by melt pump rpm. First meter and last meter share the same layer ratio.

Bubble instability at wide widths during night shift. Night-shift temperature drops change air density and alter bubble cooling — the bubble "breathes" and frost line height oscillates. The IBC's internal pressure sensor detects diameter changes and adjusts internal air volume faster than an operator can react. Operators spend less time fighting the bubble and more time monitoring quality.

Production Scenarios

Production Scenarios and Recommended Configurations

How It Works

1. Material feeding: Four independent hoppers feed HDPE, LDPE, and additives into four extruders with gravimetric blender option.

2. Melting & metering: Each extruder melts its polymer at its optimal temperature. Melt pumps meter precise volume — layer ratio is controlled by pump RPM.

3. Co-extrusion in the die: Molten streams converge inside the spiral mandrel die, forming a multi-layer tube. Layer sequence is set by die channel routing.

4. Bubble formation & dual-side cooling: The melt tube exits the die and inflates. External dual-lip air ring and IBC system cool from both sides simultaneously.

5. Bubble stabilization & collapsing: A stabilizing cage guides the bubble into the collapsing frame, flattening it into a double-layer web.

6. Oscillating haul-off & winding: The nip assembly rotates 360° to distribute gauge variation. The winder produces rolls up to 1200 mm diameter.

Optional Configurations

Available Options and When They Add Value

Customer Case

Location: Riyadh, Saudi Arabia — construction film manufacturer
Machine: Four-Head Film Blowing Machine, IBC, oscillating haul-off, 3200 mm die
Film product: HDPE vapor barrier, 100 microns, 3000 mm lay-flat
Before: 5 monolayer lines at 80-95 kg/h each. Gauge variation ±14%. 3 operators/shift. Material giveaway: ~18 tons/month.
After: One four-head line replaced all 5. Output: 340 kg/h sustained. Gauge ±5%. 1 operator/shift. Material giveaway reduced by 11 tons/month — savings ~$13,200/month.
Payback: 16 months.

Why Choose MINGYANG

• 15+ years manufacturing blown film equipment in Jiangyin, Jiangsu — machines running in 30+ countries.

• 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 film structure at production speed before crating. You receive test data and video before dispatch.

• 2-year warranty on main drives, 1 year on electrical. Critical spares stocked in inventory, shipped within 48 hours.

• Installation and commissioning: Remote video-guided as standard; on-site engineer available. Training covers recipe setup, layer ratio adjustment, IBC tuning, and preventive maintenance.

Frequently Asked Questions

Performance and Material Compatibility

What polymers can this four-head machine process?

HDPE, LDPE, LLDPE, mLLDPE, and EVA in any layer combination. Typical structures: HDPE core with LDPE skins; all-HDPE for geomembrane; LDPE/EVA outer with HDPE inner for greenhouse film. Not suitable for PA, EVOH, or polymers requiring barrel temperatures above 280°C.

What is the realistic sustained output for HDPE film?

At 80 microns HDPE, 3000 mm lay-flat: 300-380 kg/h sustained. At 40 microns: 220-280 kg/h. At 150 microns (geomembrane): 350-450 kg/h. Output is limited by cooling capacity and bubble stability. We provide output estimates for your specific film during pre-sale review.

What layer ratio range can the machine achieve?

Typical layer ratios range from 10% to 40% per extruder. Four-layer structures might be 15/35/35/15 or 10/20/30/40 or 25/25/25/25. Practical minimum per layer is roughly 10% of total thickness. For very thin skin layers (under 5%), we can configure one extruder with a smaller screw diameter — discuss during quotation.

Purchasing and Delivery

What is the typical delivery lead time?

Standard: 40-55 working days. Custom die sizing: 55-70 working days. Sea freight: Middle East 15-20 days, Southeast Asia 7-10 days, Africa 20-30 days, South America 25-35 days.

What information do you need to configure and quote?

Target film structure (layers, polymers, ratios), lay-flat width range, typical and maximum gauge, target output (kg/h or tons/month), key applications, and factory electrical supply. Share polymer grade datasheets if available.

Do you offer installation supervision on-site?

Remote video-guided commissioning is standard. On-site MINGYANG engineer available at additional cost. Most customers succeed with remote support — the machine ships pre-calibrated.

Installation and Maintenance

What operator training do you provide?

Training covers: HMI recipe setup, layer ratio programming, IBC tuning, die gap adjustment, winder tension, startup/shutdown, and daily inspection. Delivered separately to operators and maintenance staff. Written SOPs in English. Free refresher via video call within warranty.

What routine maintenance does the IBC system need?

Air filter cleaning every 100 operating hours. Fan bearing inspection every 500 hours. Internal duct inspection every 1000 hours. The IBC is closed-loop — filter maintenance is the primary routine task.

Get Your Four-Head Film Blowing Machine Quote

Tell us what film you need to produce — we'll configure and quote within 3 working days.

• Target film structure (layers, polymers, layer ratios)

• Lay-flat width range and typical film gauge (microns)

• Target output: kg/h or tons/month

• Key film application and standards (ASTM, EN, ISO)

• Optional requirements: IBC, oscillating haul-off, auto die, gravimetric blenders, corona treater

• Factory electrical supply and available floor dimensions (L×W×H)