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This inline film blowing and bag making machine integrates blown film extrusion with downstream bag conversion into one continuous production line — extruding HDPE, LDPE, and LLDPE pellets directly into finished flat bags, T-shirt bags, and bottom-seal bags with no intermediate film winding, storage, or re-handling. It produces film from 0.01 mm to 0.10 mm thickness at 600-1200 mm lay-flat width, with bag sizes adjustable via the PLC touch-screen HMI. Converters supplying supermarket chains, produce markets, garment manufacturers, and retail bag distributors run this machine for direct pellet-to-bag production where eliminating the film roll inventory and second-machine conversion step reduces total production cost per bag by 15-25%.
Supermarket T-shirt vest bags: HDPE/LDPE vest bags produced directly from pellets — film blown, bubble collapsed, punched, sealed, and cut in one continuous line at 50-100 bags/min depending on bag width and gauge.
Produce bags / fruit bags: Thin-gauge LDPE flat bags at 0.01-0.025 mm for supermarket produce sections — inline production eliminates roll storage that can cause film blocking in thin-gauge LDPE during warehouse time.
Garment packaging bags: Clear LDPE or LLDPE flat bags at 0.03-0.06 mm, 400-900 mm width for apparel packaging — continuous inline production reduces film surface scratches compared to separate blowing and converting.
General-purpose flat poly bags: Standard HDPE/LDPE flat bags for industrial parts, hardware, and retail packaging — pellet-to-bag in under 3 minutes of process time.
| Application | Film Width | Material | Bag Output |
|---|---|---|---|
| T-shirt vest bags (supermarket) | 600-1000 mm | HDPE 0.012-0.025 mm | 50-100 bags/min |
| Produce flat bags (thin gauge) | 600-900 mm | LDPE 0.01-0.02 mm | 80-130 bags/min |
| Garment packaging bags | 800-1200 mm | LDPE/LLDPE 0.03-0.06 mm | 40-70 bags/min |
| General flat poly bags | 600-1100 mm | HDPE/LDPE 0.015-0.05 mm | 50-90 bags/min |
Bag producers running 1000-3000 tons of bags per year who currently buy film rolls from an external blown film supplier or run separate film blowing and bag converting departments. Inline integration eliminates intermediate film roll winding, storage, inventory, and the second unwind/conversion step — reducing total production cost per bag by reducing material handling, scrap from roll changes, and labor between processes.
Manufacturers supplying a consistent bag SKU range where the film width (600-1200 mm) and thickness (0.01-0.10 mm) fit within the machine's continuous operating window. This machine suits medium-to-long production runs of the same bag spec — not a shop that changes bag dimensions every 30 minutes.
Producers in markets with high electricity and labor costs where the combined extrusion and bag-making process draws 40-60 kW total (vs. separate 55mm extruder line at 35-45 kW plus bag machine at 7-12 kW, plus roll handling labor). The inline machine eliminates one full heating and cooling cycle — the film enters the bag conversion section while still warm and pliable, reducing the energy needed for bag sealing.
Shops expanding bag production capacity with a single machine purchase rather than buying a separate blown film line and a separate bag machine. One inline machine replaces two standalone machines, reduces floor space by roughly 30-40%, and needs one operator instead of two.
Producers who sell film rolls as a product. This machine converts all extruded film into bags inline — there is no film roll output, no film winding for external sale. If you supply film rolls to bag converters, this machine does not fit. See our standalone high-speed film blowing machines.
Shops that change bag dimensions more than 6-8 times per shift. Inline integration means both the extrusion parameters and the bag conversion parameters must be changed on each SKU switch — changeover takes 15-25 minutes vs. 5-8 minutes on a standalone bag machine running pre-made film rolls. If your production is high-mix, low-volume, separate machines are more efficient.
Startups producing under 500 tons of bags per year. The inline machine reaches economic payback above roughly 80 kg/h sustained output. Below that volume, separate used or entry-level blown film and bag machines cost less upfront and offer more flexibility. For lower volumes, see our standalone bag making machines.
Converters running bio-compostable or heat-sensitive specialty films. This machine is designed for conventional PE (HDPE, LDPE, LLDPE). Processing PLA or PBAT requires different screw geometry and narrower temperature control — see our biodegradable film blowing machines.
Not sure if inline production fits your bag manufacturing? Send us three data points and we'll calculate whether inline integration saves you money vs. separate machines:
Your typical bag dimensions and annual volume (tons)
Your current production setup (buy film rolls or blow your own)
Your electricity cost per kWh and operator cost per shift
Conventional bag production heats film twice: extrusion at 160-210°C, then after cooling and storage, the bag machine sealing bar reheats to 120-180°C. The inline machine feeds film directly into the bag section while still at 40-60°C from the collapsing frame — the sealing bar starts from warm film, reducing seal dwell time and energy. Total energy per kg of finished bags is typically 20-30% lower than separate blown film and bag machines combined.
Separate blown film and bag converting means winding film into rolls, storing rolls, loading onto the bag machine, and discarding roll cores and start-up scrap from each change. Inline production eliminates all of this — film goes from die to bubble to bag sealing station in one continuous web. No winding, no roll storage, no roll-change scrap. Film surface quality improves because the film never contacts a winding drum or accumulates dust in storage. This is especially critical for thin-gauge LDPE (0.01-0.02 mm) where blocking during roll storage is a known problem.
The 55-65mm screw at 30:1 L/D ratio provides 80-120 kg/h output — intentionally matched to the bag conversion section's maximum throughput. A larger extruder would produce more film than the bag section can convert, requiring the line to run below extruder capacity or wasting film. The 30:1 L/D with double lip air ring provides sufficient melt homogeneity for stable bubble formation at 80-120 kg/h across the 600-1200 mm width range. The extrusion rate is the steady-state production speed, not a peak number.
The PLC controls both the extruder screw speed (film output rate) and the bag section cycle rate — keeping them synchronized without the operator manually adjusting either. If the bag section briefly slows for a seal dwell adjustment, the extruder speed adjusts to prevent film accumulation. If the bag section speeds up for shorter bags, the extruder matches the increased film demand. This closed-loop synchronization eliminates the film tension hunting and web sag that plague separately controlled extrusion and converting lines.
Free inline production analysis — send us your bag specification, get back an integrated line configuration and cost comparison. We'll provide:
Inline line configuration recommendation for your bag dimensions and volume
Cost-per-kg comparison: inline vs. separate machines (energy, labor, scrap)
Estimated payback period based on your production volume
No cost. Data-driven analysis using your actual production numbers. Send your bag spec here.
Paying for film heating twice — extrusion then bag sealing. Separate blown film and bag machines heat the same polymer twice to similar temperatures: extrusion at 160-210°C, then bag sealing at 120-180°C after the film has fully cooled. The inline machine feeds warm film (40-60°C) directly into the bag sealing station — the temperature delta the sealing bar must bridge is 60-100°C smaller. For a converter producing 2000 tons/year, this eliminates roughly 15-25% of total thermal energy input across the two processes.
Thin-film blocking during roll storage — LDPE bags under 0.02 mm sticking together. Thin-gauge LDPE film wound under tension into rolls can block (layers adhere) during warehouse storage, especially in warm climates. When the blocked roll unwinds on the bag machine, the film tears or stretches unevenly — creating scrap and stoppages. Inline production eliminates roll storage entirely — film is converted to bags within minutes of extrusion, before blocking can occur.
Roll-change scrap accumulating across hundreds of roll changes per month. Every roll change on a standalone bag machine wastes the first 5-10 meters of film (threading) and the last 3-5 meters (core attachment zone). Across 500 roll changes per month, that's 4,000-7,500 meters of film scrapped — roughly 150-300 kg/month on thin-gauge production. Inline production has no roll changes — one continuous web from extruder to finished bags.
Operator coordination between extrusion and bag departments. In separate-machine setups, the blown film operator runs at their pace, the bag machine operator at theirs — film rolls accumulate between departments or the bag machine runs out of film and sits idle. Inline operation has one PLC controlling both sections, one operator monitoring the complete line. Production flows at a single synchronized rate, not two independent rates that drift apart across a shift.
| Scenario | Material | Extrusion Output | Bag Output |
|---|---|---|---|
| T-shirt vest bags (single SKU, 2-shift) | HDPE 0.015 mm, 800 mm width | 90-110 kg/h | 70-90 bags/min |
| Produce flat bags (thin gauge, high volume) | LDPE 0.012 mm, 700 mm width | 80-100 kg/h | 100-130 bags/min |
| Garment packaging (medium gauge, wide width) | LDPE/LLDPE 0.04 mm, 1000 mm width | 100-120 kg/h | 40-60 bags/min |
| Mixed flat bag production (multiple SKUs) | HDPE/LDPE 0.02-0.05 mm, 600-1000 mm | 85-110 kg/h | 50-90 bags/min |
Material feeding & extrusion: HDPE/LDPE/LLDPE pellets feed into the 55-65mm extruder (30:1 L/D). The screw melts and homogenizes the polymer at 160-210°C. Optional auto loader and gravimetric blender for additive dosing.
Bubble formation & cooling: Melt exits the die head and inflates into a bubble. The double lip air ring cools the outside; film width is controlled by air volume and bubble cage adjustment. Film thickness: 0.01-0.10 mm at 600-1200 mm lay-flat width.
Bubble collapsing & optional corona treatment: The collapsing frame flattens the bubble into a double-layer web. Optional inline corona treater raises the film surface dyne level for printability. Optional EPC (edge position control) system guides the web for consistent edge alignment.
Inline bag sealing & cutting: The warm film web enters the bag conversion section directly — heat-sealing bar forms the bag bottom/top seal, cutter separates the bag from the web. PLC synchronizes bag section cycle rate with extrusion output.
Bag stacking & collection: Finished bags are collected on the stacking table with programmable count per stack. The automatic winder provides roll-winding option for perforated roll-bag production.
| Parameter | Specification |
|---|---|
| Suitable Material | HDPE / LDPE / LLDPE |
| Film Width | 600–1200 mm |
| Film Thickness | 0.01–0.10 mm |
| Screw Diameter | 55–65 mm |
| Screw L/D Ratio | 30:1 |
| Output Capacity | 80–120 kg/h |
| Bag Making Speed | 30–130 pcs/min |
| Control System | PLC + Touch Screen |
| Main Motor | 22–37 kW |
| Total Power | 40–60 kW |
| Air Ring | Double Lip Air Ring |
| Winder Type | Automatic Winder |
| Optional Devices | Corona Treater, Auto Loader, EPC System |
Location: Nairobi, Kenya — retail bag manufacturer
Machine: Inline Film Blowing & Bag Making Machine, 60mm screw, double lip air ring, PLC control
Bag product: HDPE T-shirt vest bags, 0.018 mm × 750 mm, for supermarket chains
Before: Purchased HDPE film rolls from external supplier. One bag machine at 55-65 bags/min. Film roll cost: ~$1,350/ton. Monthly: ~$40,000 (30 tons).
After: Inline machine producing directly from HDPE pellets. Pellet cost: ~$950/ton. Monthly: ~$26,000 (28 tons — less scrap). Electricity: ~$2,800/month. Net monthly saving: ~$11,200.
Payback: 13 months from raw material cost reduction alone.
15+ years manufacturing blown film and bag making 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 bag specification at production speed before crating. Test data and video provided before dispatch.
2-year warranty on main drive components, 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 extrusion and bag section setup, inline synchronization tuning, and preventive maintenance for both sections.
HDPE, LDPE, and LLDPE. The 30:1 L/D screw processes all three without hardware changes. HDPE requires 190-210°C extrusion temperature; LDPE and LLDPE run at 160-180°C. Switching between materials is a recipe selection on the PLC HMI. Not suitable for PP (requires higher extrusion temperatures and different screw geometry) or biodegradable polymers (PLA/PBAT).
Bag width and film thickness are the primary factors. Narrower bags (600-800 mm) in thin film (0.01-0.02 mm) reach 100-130 bags/min. Wider bags (1000-1200 mm) in thicker film (0.05-0.10 mm) run at 30-60 bags/min. The PLC automatically adjusts bag section cycle rate to match extrusion output — the extruder's 80-120 kg/h rate is the steady-state production ceiling.
Yes, with the T-shirt bag conversion module (punching station after the sealing section). The inline process extrudes film → collapses bubble → seals bottom → punches handle holes → cuts bag. Specify T-shirt bag configuration at order if vest bag production is required.
Standard: 40-55 working days. Custom configurations: 55-70 working days. Sea freight: Southeast Asia 7-10 days, Middle East 15-20 days, Africa 20-30 days, South America 25-35 days.
Target bag type (flat bags, T-shirt bags, or both), bag width and length range (min-max in mm), film material and typical thickness, and target monthly output (tons). Share your most common bag SKU specifications — we'll configure the inline parameters for that and verify compatibility with the rest.
The inline machine has one PLC system, one set of drives, and one operator interface — reducing the number of components to maintain compared to two separate machines. The extruder screw and barrel follow standard blown film maintenance intervals (screw inspection every 3,000 hours). The bag sealing section uses replaceable PTFE-coated sealing bars (3,000-5,000 hour service life). One maintenance technician covers the complete line.
Training covers: extrusion startup and temperature profiling, bubble stability, bag section synchronization, recipe storage per SKU, and complete-line troubleshooting. Written SOPs in English. Free refresher within warranty.
One spare screw and barrel set, two spare sealing bars, heater cartridges, and a recommended 12-month consumables list with part numbers. Reorder delivery within 48 hours for stocked items.
Tell us your bag requirements — we'll configure the complete inline line and quote within 3 working days.
Bag type: flat bags, T-shirt vest bags, or both
Bag width and length range (min-max in mm)
Film material and typical thickness (e.g., HDPE 0.015 mm)
Target monthly output: tons/month or bags/day
Optional requirements: corona treater, auto loader, EPC system
Factory electrical supply and floor dimensions (L×W×H)
