Technical Specifications

HDPE Single Screw Film Blowing Machine — MYB Series

Applications

The MYB series HDPE single screw film blowing machine produces HDPE, LDPE, and LLDPE mono-layer blown film from 0.008–0.06 mm across three frame sizes up to 1,000 mm layflat. Built as an entry-to-mid-level workhorse for SME film producers, it prioritizes reliable output, simple operation, and accessible maintenance over the complexity of multi-layer systems.

• Garbage bags & trash liners — HDPE film with CaCO₃ filler at 0.012–0.04 mm. The 32:1 L/D screw disperses filler evenly so gauge stays consistent — no thin spots that split when the bag is lifted from the bin.

• Supermarket & retail shopping bags — Thin-gauge HDPE/LDPE at 0.01–0.025 mm. Single-screw simplicity means the operator adjusts one extruder, not two or three — ideal for shops where one operator runs multiple lines.

• Agricultural mulch & greenhouse film — 0.008–0.02 mm film for crop protection. The 40Cr mirror-finish die head distributes melt evenly at thin gauge — minimal gauge bands across the full 1,000 mm web width.

• General-purpose industrial packaging — 0.03–0.06 mm film for parts wrapping and construction liners. The single-screw platform runs HDPE with up to 30% LLDPE blend for improved puncture resistance.

Who This Machine Is For

• First-time film producers entering the market — If you're buying your first blown film line, the MYB's single-screw platform gives you one extruder to learn, one temperature profile to manage, one die head to clean. Master this machine and you've mastered the fundamentals of blown film extrusion.

• SMEs replacing unreliable or aged machines — If your current line spends more time waiting for the maintenance technician than producing film, the MYB's accessible design puts common service points within reach of your shift operator — no specialist tools needed for routine maintenance.

• Producers running simple, high-volume mono-layer film — If your product mix is 80%+ garbage bags and plain carrier film, a multi-layer machine adds complexity you don't need. The MYB produces the film your customers buy at the lowest capital cost per kg of output in our range.

• Export-oriented SMEs in price-sensitive markets — The MYB series ships at a price point that fits SME budgets in Africa, Southeast Asia, and South America — with CE-certifiable build, English documentation, and on-site training included.

Who Should NOT Buy This Machine

• Producers needing recycled-content film — A mono-layer machine puts all your material — virgin, recycled, or filled — into a single visible layer. Any contamination shows on the film surface. If you need to run recycled material for cost savings, an ABA co-extrusion machine hides recycled content in the core layer.

• Shops requiring output above 120 kg/h per line — The MYB-1100 tops out around 100–110 kg/h. For sustained output above 120 kg/h, contact us for a larger screw-diameter specification.

• Producers making multi-layer or barrier film — If your product requires EVOH, PA, or differentiated layers, see our ABC three-layer co-extrusion line.

Technical Advantages

32:1 L/D Barrier Screw — Optimized for HDPE

32:1 L/D provides extended residence time for thorough HDPE melting and filler dispersion. HDPE melts at 170–230°C and requires more barrel length than LDPE to plasticize fully. The MYB screw is profiled for HDPE rheology — compression ratio and barrier flight position tuned to HDPE's higher melt viscosity. Unlike general-purpose screws designed as a compromise across polyolefins, this geometry extracts full output from HDPE without overheating the polymer. For producers running HDPE as primary material: 8–12% more output at the same energy input.

Accessible Maintenance Design — No Specialist Tools

Common service points — screw removal, screen change, die-head cleaning — reachable by a shift operator with basic training. On many blown film lines, a screw pull requires a crane, a technician, and a full shift of downtime. The MYB positions the extruder at working height with a bolt-on barrel flange — the operator removes the die head, unbolts the flange, and pulls the screw with a standard chain hoist. Screen changes under 10 minutes. Die-head cleaning: 30 minutes, not a half-day job. For SMEs without a dedicated maintenance team, this means the operator handles common service without calling outside help.

Ceramic Heater + PID Control — Stable Temperature Across 4–6 Zones

Ceramic heater bands with independent PID control per zone maintain setpoint within ±2°C. HDPE is sensitive to overshoot — a 10°C spike degrades the polymer, creating gel particles (fisheyes) in the finished film. The ceramic heaters' thermal mass dampens swings, and the PID calculates duty cycle from actual zone temperature — not open-loop percentage. Unlike contactor-based full-on/full-off systems, PID modulation prevents the temperature oscillations that cause gauge variation between the die head's warm and cool cycles.

Real Production Issues It Solves

• Gel particles (fisheyes) in HDPE film — HDPE overheats easily if the screw profile is too aggressive or heaters overshoot. The MYB's HDPE-optimized screw compression ratio plus PID control prevents localized overheating — gel count stays below retail-acceptance threshold.

• Difficulty finding maintenance technicians — In many markets, an extrusion technician books weeks out. The accessible screw-pull design and tool-free screen-change access let your shift operator handle common maintenance — the machine doesn't sit idle waiting for a specialist.

• Voltage fluctuation in industrial zones — Grid sagging 10–15% during peak hours drops heater output — the bubble freezes unevenly. Ceramic heater thermal mass buffers dips; PID recalculates from actual temperature each cycle — a 30-second sag doesn't become a bubble collapse.

• Operator turnover and retraining — High-turnover shops lose days retraining on complex machines. The MYB's single-screw, single-die, single-material workflow gets a new operator running in 1–2 days — one extruder, one temperature profile, one die head.

Production Scenarios

How It Works

1. Material feeding: HDPE granules plus CaCO₃ filler and color masterbatch load into the hopper — manually or via optional vacuum loader. The water-jacketed feed throat prevents premature melting that causes bridging.

2. Plasticizing & melting: The 32:1 L/D screw conveys material through 4–6 heated zones. Ceramic heaters raise barrel temperature progressively (170–230°C for HDPE). The screw compresses, shears, and homogenizes the melt.

3. Filtration & die head extrusion: Melt passes through a screen pack (catches contaminants) and enters the spiral mandrel die. The 40Cr mirror-surface die head distributes melt into a uniform annular flow.

4. Bubble formation & cooling: Compressed air inflates the melt tube into a bubble. The air ring blows cooling air to set the frost line. An iris-style bubble cage (optional) stabilizes the bubble for consistent gauge.

5. Collapsing & nip: The bubble passes through the collapsing frame to the nip rollers. Servo-driven take-up maintains constant speed — no speed drift, no gauge variation.

6. Winding: The torque-motor winder produces finished rolls at the specified width — single or multi-roll output with in-line slitting. Tension is controlled for tight, even rolls.

Optional Configurations

Customer Case

Location: Addis Ababa, Ethiopia — SME packaging startup
Machine: MYB-850 HDPE single screw film blowing machine
Product: HDPE garbage bag film, 0.02 mm, 700 mm layflat, 25% CaCO₃ filler
Before: Purchasing plain film rolls from a regional supplier at $1.42/kg. 3-day lead time. Minimum order 2 tons. Film gauge inconsistency (±15%) caused bag-making machine jams downstream.
After: In-house production at $0.89/kg (resin + electricity + labor). Gauge variation ±5%. Same-day availability. Payback in 14 months. The operator — hired with no extrusion experience — was running independently after 2 days of training.

Why Choose MINGYANG

• 15+ years building blown film lines — Mingyang Packaging Machinery Co., Ltd. manufactures in Guangdong, China, with machines in 40+ countries. We cast screws, machine barrels, and assemble die heads in-house — not a trading company reselling someone else's equipment.

• CE-certified, export-ready — Every MYB machine meets CE safety and electrical standards. Documentation includes wiring diagrams, mechanical drawings, and spare parts list in English.

• Factory acceptance testing — Your machine runs your specified material at our factory before shipment. We record parameters on video and send it to you — you see your machine producing film before you pay the balance.

• Installation and on-site training — One engineer travels to your site for setup and operator training (5–7 days). Training covers startup, shutdown, gauge adjustment, material changeover, and basic maintenance — designed for operators with no prior extrusion experience.

• 12-month warranty with stocked spare parts — Covers screw, barrel, gearbox, motors, heaters, and blowers. Common wear parts — heater bands, screen packs, sealing rings — ship from stock within 48 hours.

Frequently Asked Questions

Performance and Material Compatibility

What materials can the MYB series process?

HDPE, LDPE, LLDPE, and blends with up to 40% CaCO₃ filler. The 32:1 L/D screw is optimized for HDPE's higher melt temperature — it processes HDPE more efficiently than general-purpose screws. Recycled PE can be used if it's clean and of consistent melt index.

What's the thinnest and thickest film it can produce?

0.008 mm (8 microns) minimum on LDPE/LLDPE blends; 0.06 mm maximum. At the thinnest gauge, bubble stability requires a draft-free production bay and consistent ambient temperature. The MYB-1100's wider die head handles 0.008 mm film across the full 1,000 mm web.

How much output can I expect with HDPE vs. LDPE?

HDPE outputs 10–15% less than LDPE at the same speed — its higher melt viscosity requires more torque. MYB-850: ~65–75 kg/h on HDPE at 0.025 mm vs. ~80–90 kg/h on LDPE. The 32:1 L/D screw narrows this gap vs. shorter 28:1 screws.

Purchasing and Delivery

What's the lead time?

Standard-configuration MYB machines ship in 25–35 days. Custom voltage or non-standard die head sizes add 5–10 days. Sea freight: 15–25 days to East/West Africa, 10–18 days to Southeast Asia, 25–35 days to South America.

What should I prepare before the machine arrives?

A level concrete pad (footprint + 1.5 m clearance), a power supply matching your voltage with a dedicated breaker rated 25% above full load, compressed air (0.6–0.8 MPa), and cooling water for the feed throat. We send the installation drawing and utility checklist 2 weeks before shipment.

Installation and Maintenance

How long does installation and training take?

Mechanical install: 2–3 days. Electrical & commissioning: 1–2 days. Training: 3–5 days on startup, shutdown, gauge adjustment, material changeover, and basic maintenance. Operators with no prior extrusion experience run independently by day 4.

What's the daily maintenance routine?

Each shift: check gearbox oil level, clean die head lip of polymer buildup, check air filter on blower intake. Weekly: inspect heater band connections for looseness, clean screen changer, check nip roller rubber. Monthly: measure screw flight clearance — exceeding 0.5 mm on a 55 mm screw means plan a screw replacement.

How long do heater bands last?

8–14 months under 24/6 operation. First sign: a zone can't hold setpoint — PID at 100% duty but temperature stays 5–10°C below target. A failed band reads open-circuit on a multimeter. Keep one spare per zone size; replacement takes 15 minutes.

Get Your MYB Series Quote

Tell us about your production plans:

• Film application: What are you making? (garbage bags, shopping bags, agricultural film, industrial liner)

• Material & recipe: HDPE? LDPE? LLDPE blend? CaCO₃ filler percentage?

• Target thickness & width: Gauge in mm and layflat width of finished roll

• Daily output target: How many kg per day or month?

• Power supply: Voltage, frequency, and phase at your factory

• Destination port: For freight quotation