High-Speed PE Film Blowing Machine for HDPE LDPE LLDPE

Applications

This machine runs HDPE, LDPE, and LLDPE on one line without hardware changes. The L/D 30:1 screw with dual-purpose compression ratio plastifies all three PE grades — HDPE at higher barrel temperatures (200-230°C), LLDPE at lower temperatures (180-210°C) with higher motor torque. Grade changeover takes 30-40 minutes of purging through the PLC panel. No screw or die swap required.

Who This Machine Is For

• Factories running multiple PE grades across different orders. If your weekly schedule alternates between HDPE garbage bag film, LDPE agricultural film, and LLDPE stretch wrap, this line handles all three without hardware changes.

• Producers serving supermarkets and retail chains. These customers typically order multiple film types — shopping bags, produce bags, garbage bags — from one supplier. One multi-material machine covers the range.

• Manufacturers in developing markets where electricity cost matters. Servo motor drives reduce energy consumption by 12-18% compared to AC motors. Over 6,000 operating hours at $0.10/kWh, this saves $4,000-7,000 annually in electricity alone.

• Growing factories that need to expand product range without adding floor space. One high-speed line producing multiple PE films occupies less factory floor than two single-material machines.

Who Should NOT Buy This Machine

• If you only run one PE grade year-round — for example, only LDPE agricultural film — buy a mono-layer blown film line. It costs 40-50% less and the multi-material capability of this machine adds no value to your operation.

• If your production requires recycled content above 20%. This machine blends up to 20% post-industrial recycled PE into the feedstock. For 30% recycled content or post-consumer recyclate, an ABA film blowing machine is the correct choice — virgin skin layers encapsulate the recycled core.

• If you need barrier film for food packaging. This is a single-layer PE line. For PA/EVOH barrier structures, you need an ABC co-extrusion blown film machine with independent layer control.

Technical Advantages

One Screw, Three PE Grades

L/D 30:1 with a barrier mixing section processes HDPE, LDPE and LLDPE without screw changes. Each grade needs a different temperature window — HDPE at 200-230°C for proper melting, LLDPE at 180-210°C to prevent thermal degradation. The PID controllers hold each barrel zone within ±1°C of setpoint regardless of which material is running. Unlike dedicated LDPE machines where HDPE output drops 20-30% due to inadequate plastication, this screw geometry maintains rated output across all three grades.

Thin-Gauge Output That Holds at Speed

Produces 120-160 kg/h of 25-micron LDPE/LLDPE film at 1000mm lay-flat width. The dual-lip air ring stabilizes the bubble at high line speeds — when running 15-micron LLDPE, the bubble is less stable because the thin melt has lower melt strength. The dual-lip design directs cooling air at two angles, creating a more stable frost line than single-lip rings. With IBC engaged, output increases 15-25% because the bubble solidifies from both inside and outside simultaneously.

Gauge Consistency That Automated Packaging Lines Demand

±5% or better thickness variation across the web at steady-state production. The spiral mandrel die with chrome-plated flow surfaces distributes melt uniformly. The oscillating haul-off rotates through a programmed angle to spread gauge bands evenly across the roll — without oscillation, hard bands form at fixed positions and cause registration errors on downstream gravure printing and bag sealing machines. One operator can manage two lines when auto air ring and IBC handle real-time adjustments.

Real Production Issues It Solves

• Bubble instability during rainy season. High humidity reduces air ring cooling efficiency because moist air removes less heat from the bubble surface. The dual-lip air ring compensates better than single-lip designs — the second lip provides targeted cooling at the frost line where it matters most. In a factory in coastal Kenya where humidity regularly exceeds 80%, this machine maintained output within 10% of dry-season rates.

• LLDPE motor overload on hot starts. LLDPE has higher melt viscosity than LDPE — on a cold start, the extruder motor draws higher current until the barrel reaches setpoint. The servo motor handles this inrush better than AC motors because servo torque is available across the full speed range. No tripped breakers on Monday morning start-up.

• Thin film tearing at the winder. At thicknesses below 20 microns, winding tension that is correct for 50-micron film will stretch or tear the web. The center winder with closed-loop tension control adjusts automatically — the operator sets target tension in N/m and the drive holds it regardless of roll diameter build-up.

Production Scenarios

How It Works

1. Material Feeding: PE pellets enter the extruder hopper. Optional vacuum loader conveys directly from storage bags or silos. For multi-material production, separate hopper loading enables quick grade changes without cross-contamination.

2. Melting: Single-screw extruder with L/D 30:1 and barrier mixing section plastifies the polymer. PID controllers hold each zone within ±1°C. The barrier section homogenizes variable-viscosity melt from recycled PE feedstock.

3. Bubble Formation: Melt exits the spiral mandrel die and is inflated to the target blow-up ratio (2:1 for packaging, up to 3.5:1 for stretch). Dual-lip air ring delivers external cooling. With IBC, chilled air cools from inside simultaneously.

4. Stabilization: Collapsing frame and basket guide the bubble into nip rollers. Height adjusts for different BURs. Oscillating haul-off distributes gauge bands.

5. Winding: Surface or center winder — single or dual-turret — produces finished rolls. For lines above 100 kg/h, dual-turret enables continuous operation without stopping to unload.

Optional Configurations

Customer Case

Nairobi, Kenya — 2025. A packaging manufacturer replaced a 12-year-old mono-layer LDPE line with this high-speed PE machine.

The multi-material capability opened a market segment the old LDPE-only machine could not serve. Within six months, HDPE garbage bag film accounted for 30% of the factory's revenue — business that previously went to competitors.

Why Choose Mingyang Machinery

• 20+ years focused on film blowing machines. We do not make injection molding machines or pipe extruders. Screw design, die optimization, and blown film line integration is the entire business. Factory in Jiangyin, Jiangsu Province.

• CE certified. Full documentation for EU and international customs clearance.

• Engineer support: Pre-sales — we recommend extruder sizing and screw specs based on your actual material mix. Post-installation — video call, remote diagnostics, optional on-site dispatch within 10 working days.

• Spare parts same-week dispatch: Heater bands, thermocouples, SSRs, seals, bearings stocked. Long-lead custom parts can be pre-ordered with the machine.

• 60+ countries: Container loading, sea freight documentation, destination port coordination. One supplier from order to installation.

Frequently Asked Questions

Performance and Materials

What output can I expect?

LDPE/LLDPE at 1000mm width, 25 microns: 120-160 kg/h. HDPE at same width, 15 microns: 100-130 kg/h. LLDPE stretch at 500mm, 20 microns: 80-110 kg/h. All figures from customer installations in similar operating conditions — not lab reference runs.

Can I switch between HDPE, LDPE, and LLDPE without hardware changes?

Yes. Adjust temperature profiles and screw speed via the PLC panel. HDPE: 200-230°C barrel temperature. LLDPE: 180-210°C. No screw or die changes required. Purge time between grades: 30-40 minutes.

What is the minimum film thickness?

15 microns for LDPE/LLDPE. 8 microns for HDPE. Below these, bubble stability — not extruder capacity — limits output. IBC improves thin-gauge stability by cooling from inside.

Can this machine run recycled PE?

Up to 20% post-industrial recycled PE blended into feedstock. The barrier mixing section homogenizes variable-viscosity melt. For higher recycled content or post-consumer recyclate, use an ABA blown film machine where virgin skins encapsulate the recycled core.

Costs and Logistics

What is the electricity consumption?

Approximately 0.45-0.55 kWh per kg of film produced, depending on material and thickness. At $0.10/kWh and 6,000 hours/year producing 130 kg/h average: roughly $35,000-43,000 annual electricity cost. Servo motors reduce this by 12-18% compared to AC motor equivalents.

What floor space does the machine need?

Approximately 8m (L) x 5m (W) x 7m (H) for a standard 1000mm-width configuration. Tower height depends on cooling requirements — HDPE typically needs a taller tower than LDPE due to slower solidification. We provide a detailed floor layout drawing with your quotation.

What is the typical payback period?

Based on customer data: 14-22 months when replacing an older machine, factoring in output increase, energy savings, and material flexibility. The Kenya customer recovered their investment in 14 months — 8 months faster than projected, primarily from the HDPE revenue stream their old machine could not produce.

Delivery time?

Standard configuration: 45-55 days from deposit. With IBC, auto air ring, or custom screw: 60-75 days. Sea freight: 20-35 days plus customs clearance.

Maintenance

How often does the screw need replacement?

5-7 years with clean virgin PE. 3-5 years with recycled PE or filled compounds. The fastest way to damage a screw: leaving heat-degraded polymer in the barrel during shutdown. Purge with stable LDPE before extended stops.

What spare parts should I stock?

Heater bands (2 full sets), thermocouples (full set + 3 spares), solid-state relays (3), air ring seals (1 set), winding shaft bearings (2 sets). Parts list with numbers and pricing comes with your quotation.

What warranty is included?

12 months from commissioning or 18 months from shipment, whichever is first. Covers manufacturing defects. Wear parts excluded. Extended warranty available for gearbox and main motor.

Get a Configuration and Quotation

Send us your production parameters for a proposal with estimated output, energy consumption, floor layout, and pricing:

• Primary PE material and percentage mix (HDPE / LDPE / LLDPE)

• Film width (lay-flat, mm) and thickness range (microns)

• Required output per day or month (kg)

• Recycled content requirement (percentage and source)

• Optional systems (IBC, auto air ring, corona treater, gravimetric dosing)

• Electrical supply (voltage, frequency, phases)

carrie@jymingyang.com | +86-189-6169-1127