LDPE vs LLDPE Film Blowing Machine — Resin Choice, Machine Setup, Film Cost
LDPE and LLDPE are both polyethylene and usually run on the same blown film line — but they behave differently in the bubble, in the seal bar and in the bag. This page compares the two resins on the properties that decide film cost and bag performance, and shows the E-SHION configurations that run each.
LDPE vs LLDPE at a glance
| Property | LDPE | LLDPE |
|---|---|---|
| Molecular structure | Long-chain branched | Short-chain linear, narrower distribution |
| Film feel | Softer, more transparent, glossier | Tougher, stiffer-feeling, slightly hazier |
| Tensile and puncture strength | Moderate | Higher — dart impact and tear strength both improve |
| Seal behaviour | Lower seal-initiation temperature, wide sealing window | Higher seal temperature, narrower window, higher hot-tack |
| Bubble stability | Very stable, easy to run | More sensitive to cooling and die gap — needs a tuned air ring |
| Down-gauging potential | Limited | Good — same strength at lower thickness |
| Typical film use | Carrier bags, liners, garment and courier bags | Heavy-duty garbage bags, stretch and industrial film |
What actually has to change on the machine
The same extruder can run both resins, but three settings decide whether the bubble runs or fights you.
Tell us your blend and the target gauge when you order. We set screw, die gap, temperature profile and air ring for the resin you actually buy, instead of shipping a generic LDPE setup.
- 1 · Screw and temperature profile — LLDPE needs a slightly different compression and a cooler feed zone to avoid melt fracture
- 2 · Die gap — LLDPE runs best with a wider gap than LDPE; on a line that switches between the two, the gap is an order-time decision
- 3 · Air ring and cooling — LLDPE is more cooling-sensitive, so bubble stability at high output depends on air-ring design rather than on motor power
- 4 · Take-off and winding — LLDPE film is stiffer; tension settings change to avoid wrinkles and edge curl
The blend is usually the real answer
Most bag producers do not choose one resin — they blend. A typical LDPE/LLDPE blend keeps the easy processing and sealing of LDPE while gaining the puncture resistance of LLDPE, and it is the cheapest route to a stronger bag without changing the machine.
As a working rule: low LLDPE content when the film must seal easily and look glossy, higher LLDPE content when the bag must survive rough handling or carry sharp-edged contents. Confirm the ratio with your resin supplier and give it to us before the line is configured.
Once the resin is settled, the next decision is how many layers to run it in — see monolayer vs 3-layer film blowing machine.
Which E-SHION line to order
LDPE and LLDPE both run on all three lines. Choose by film width and output first, then by whether the film needs a recycled or filled core.
| Specification | Mini Film Blowing Machine | Monolayer Blown Film Machine | ABA Film Blowing Machine |
|---|---|---|---|
| Film width (folded) | 100–800 mm | 600–1,200 mm | 100–1,200 mm |
| Output | 35–50 kg/h | 30–120 kg/h | 40–120 kg/h |
| Layer structure | Monolayer (1) | Monolayer (1) | 3-layer |
| Film thickness | 0.01–0.12 mm | 0.008–0.10 mm | on request |
| Materials | LDPE / LLDPE / HDPE | LDPE / LLDPE / HDPE | LDPE / LLDPE / HDPE / CaCO₃-filled compound |
| Installed power | 20 kW installed | 46–74 kW installed | 52 kW installed |
| Indicative price | $12,000 – $28,000 | $18,000 – $45,000 | $35,000 – $90,000 |
“on request” marks a value this configuration does not publish — ask for it and an engineer confirms the figure for your specification. Published figures come from the machine database and are identical on every page of this site.
Film cost, not resin price, decides the winner
LLDPE usually costs more per kilogram than LDPE, and LDPE film is easier to run. LLDPE earns its price back through down-gauging: a thinner LLDPE film can hold the same load, so cost per finished bag can be lower even at a higher resin price.
Run the comparison on cost per 1,000 bags at target strength — not on cost per kilogram of resin. Send us the bag size, thickness and required load and we will quote the configuration that hits it.
| Machine | Indicative factory-direct price | Installed power | Rated output |
|---|---|---|---|
| Mini Film Blowing Machine | $12,000 – $28,000 | 20 kW | 35–50 kg/h |
| Monolayer Blown Film Machine | $18,000 – $45,000 | 46–74 kW | 30–120 kg/h |
| ABA Film Blowing Machine | $35,000 – $90,000 | 52 kW | 40–120 kg/h |
Indicative factory-direct price — Indicative factory-direct price for a standard configuration; the final figure depends on width, output, automation and destination.
Machines that run both resins
Watch them run
LDPE Film Blowing Machine — Factory Footage
ABA Film Blowing Machine — Factory Footage
Related pages
Frequently asked questions
Can the same film blowing machine run LDPE and LLDPE?
Yes — both are polyethylene and run on the same extruder. What changes is the setup: LLDPE wants a wider die gap, a cooler feed zone and more cooling attention because the bubble is less forgiving. Tell us the resin or blend you buy and we configure the screw, die gap and air ring for it.
LDPE vs LLDPE — which makes a stronger bag?
LLDPE. Its linear structure gives higher dart impact and tear strength, so a thinner LLDPE film can carry the same load as a thicker LDPE film. LDPE seals more easily and looks glossier, which is why carrier bags that must feel premium are often LDPE or a blend.
What LDPE/LLDPE blend can your machines run?
The monolayer line runs pure LDPE through to high-LLDPE blends; the practical limit is set by the screw and air ring rather than by a fixed percentage. Confirm your typical blend when ordering so the machine is set up for it — including the minis at 100–800 mm, which handle the same resins at 35–50 kg/h.
How much does an LDPE or LLDPE film blowing machine cost?
Indicative factory-direct ranges run from about $12K to $150K depending on film width, output, layer count and automation — request a quote for your exact configuration. Indicative ranges by machine type — Monolayer: $18,000 – $45,000; IBC 3 Layer: $60,000 – $150,000; ABA: $35,000 – $90,000; 3 Layer Air Bubble: $25,000 – $65,000; PP: $18,000 – $45,000; Mini: $12,000 – $28,000.
Which line do I need for stretch film or heavy-duty bags?
Heavy-duty and industrial film generally wants higher LLDPE content and more output — the ABA 3-layer line runs 40–120 kg/h with a recycled or filled core, and the IBC 3-layer line reaches 500 kg/h at 2,600 mm folded width when volume justifies it.
Get today's factory-direct quote for your LDPE vs LLDPE film blowing machine
Tell us film width, material and target output — a real engineer replies with options, pricing and a layout drawing within 4 hours.