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The lab film blowing machine produces small-scale blown film samples from thermoplastics including PE, PP, and functional masterbatch compounds. It is built for R&D labs, quality control departments, polymer research institutes, and masterbatch manufacturers who need to evaluate film formation behavior before committing to full production runs.
Specific products and tests this machine supports:
Masterbatch dispersion evaluation: Produce film samples to visually inspect pigment dispersion quality, detect agglomerates, and measure color consistency across the film surface.
Color matching and color card preparation: Blow film swatches at controlled thickness for customer color approval — no need to schedule time on a production line.
Filler loading limit testing: Test how much CaCO₃, talc, or other fillers a formulation can carry before film mechanical properties degrade.
Recycled content compatibility: Evaluate film quality at different regrind percentages (10%–50%) to find the maximum workable ratio before bubble instability occurs.
New polymer grade qualification: Compare incoming resin lots against reference samples for gel count, haze, and melt strength under standardized conditions.
Academic polymer research: Demonstrate blown film extrusion principles, study melt rheology effects on bubble stability, and train students on industrial film production concepts.
| Application | Material Type | Typical Film Thickness | Recommended Die |
|---|---|---|---|
| Masterbatch dispersion test | LDPE + 2%–10% masterbatch | 30–50 μm | Φ30mm single-layer |
| Color matching & swatch production | LLDPE/LDPE blend + pigment | 20–80 μm | Φ30mm single-layer |
| Filler loading evaluation | PE + CaCO₃ (10%–50%) | 15–100 μm | Φ30mm single-layer |
| Recycled content trial | Virgin PE + post-industrial regrind | 20–100 μm | Φ30mm single-layer |
Masterbatch manufacturers who need to produce test films for every batch to verify dispersion before shipping to customers. A lab machine lets QC run 3–5 tests per shift without occupying a production line.
Plastics compounders and formulation developers testing new filler, pigment, or additive combinations. The 500g minimum material requirement means a single 25kg compound batch supports 50+ trial films.
Polymer research institutes and university labs conducting blown film research, teaching extrusion principles, or characterizing new resin grades. The transparent observation window and manual air ring make the film blowing mechanism fully visible.
Quality control departments in film factories that process multiple resin suppliers. Run a 1kg incoming inspection film before accepting a 25-ton lot — catch gel content or processing issues before they reach the production extruder.
Small-scale specialty film producers making short runs of custom-colored or functional films where a full-size line would waste material during startup and color transitions.
Factories needing production output above 10 kg/h. This is a benchtop R&D machine with a theoretical maximum of 8 kg/h. If you need to produce film for sale rather than testing, see our PE Film Blowing Machine or High-Speed Film Blowing Machine.
Operations requiring multi-layer film structures. This is a single-screw, single-layer machine. If your R&D involves ABA or ABC co-extrusion structures, a ABA Film Blowing Machine or ABC Film Blowing Machine is the appropriate platform — even for lab-scale work, layer ratio effects cannot be simulated on a mono-layer unit.
Companies expecting plug-and-play operation with no operator training. Lab film blowing requires understanding of melt temperature profiles, bubble stability, and frost line height. There is no "auto" button — the operator must dial in parameters per material. If your team has no blown film experience, budget 3–5 days of hands-on learning.
Biodegradable film developers working with temperature-sensitive polymers like PLA or PBAT. These materials require specialized low-shear screw geometry and tighter thermal control. Our Biodegradable Film Blowing Machine is purpose-built for narrow processing windows where ±3°C overshoot ruins a trial.
Not sure if this lab machine fits your testing workflow?
Send us three things and we will confirm compatibility within one working day:
Your primary test materials (e.g., LDPE + TiO₂ masterbatch, or PP + CaCO₃ filler)
Your target film thickness range and the number of tests per week you expect to run
Whether you need film property data (tensile, haze, dart drop) from the samples — we can recommend complementary test equipment
Test a new masterbatch formula with as little as 500g of material. Unlike a production line that requires 15–25 kg just to purge, stabilize, and reach steady-state conditions, this lab machine reaches thermal equilibrium within 15 minutes and produces evaluable film from the first 200g. A single 25kg compound batch supports over 50 trial runs — enough to test pigment loading at 5 concentration levels with 10 replicates each. This order-of-magnitude material savings directly reduces R&D cost per data point.
The φ35mm screw with 30:1 L/D provides sufficient residence time for complete pellet melting at lab-scale throughput rates. Production extruders often use shorter L/D ratios (25:1–28:1) optimized for high output, not thorough mixing. The extended 30:1 profile gives heat-sensitive masterbatch carriers (EVA, metallocene LLDPE) enough time to melt at moderate temperatures — without the shear heating that degrades pigment dispersion in machines running at production RPM. Three independent barrel heating zones allow you to set a controlled temperature gradient from feed to metering, matching the thermal profile your customers will use on their production lines.
The friction winding system with variable frequency drive maintains consistent lay-flat winding from startup through the full trial. In many entry-level lab extruders, winding tension is manual or fixed — film either bags, wrinkles, or stretches at the start of each run when the bubble hasn't stabilized. The VFD-controlled winding motor adjusts take-up speed smoothly as output fluctuates during startup, producing wrinkle-free film rolls suitable for tensile testing, haze measurement, and customer presentation. Chrome-plated drive roller surface finish prevents film scratching that would compromise optical measurements.
At 2200mm × 550mm × 1800mm and 800 kg, this machine fits through a standard door and operates from a standard 380V three-phase supply. There is no need for foundation work, crane installation, or dedicated cooling water loops. The self-contained design includes all heating, drive, and control systems within the machine envelope. For a masterbatch factory adding in-house QC capability, the machine can be placed directly in the quality lab — eliminating the logistical friction of scheduling tests on production extruders and transporting material between buildings.
Problem 1 — "We shipped 10 tons of masterbatch and the customer says dispersion is unacceptable." A masterbatch manufacturer ran production, passed internal pellet inspection, and shipped. The customer's film showed visible pigment specking. Without a lab film blowing machine, the QC check stopped at pellet appearance and MFI — it never tested actual film formation. With a lab machine on the QC bench, every production batch produces a 30μm test film within 20 minutes. Dispersion defects visible in the film trigger a hold before the truck leaves. One prevented return shipment covers the machine cost.
Problem 2 — "We reformulated with a new pigment and the first production trial wasted half a shift." A compounder developed a new color formulation on paper, then booked a 4-hour window on the production line to test it. The first hour was purge and stabilization. The second hour produced film — but the color was off by ΔE 2.5. Adjust, purge again, retry. Total: 6 hours of production downtime for one color match. The same work done on a lab machine: 3 trials × 20 minutes each = 1 hour, zero production line disruption, and the final recipe goes to production pre-validated.
Problem 3 — "We switched to a cheaper CaCO₃ supplier and film started tearing at 15% loading." A film producer changed filler suppliers to save cost, ran production at the usual 20% loading, and experienced random bubble breaks every 5–10 minutes. The production team blamed machine settings, ambient temperature, and operator error — three shifts of troubleshooting before someone questioned the filler. A systematic lab test comparing old vs. new filler at 10%, 15%, 20%, and 25% loading in one afternoon would have identified the new filler's lower carrying capacity before it ever reached production. The lab machine enables a data-driven supplier qualification process instead of trial-by-production.
Problem 4 — "Our lab extruder can make pellets but not film, so we can't evaluate film-specific properties." Many polymer labs have a small twin-screw compounder for making test pellets, but no film blowing capability. They send pellets to a third-party lab for film evaluation — 2-week turnaround, $500+ per sample, and no real-time observation. A lab film blowing machine closes that capability gap. The researcher compounds a 5kg batch in the morning, blows film in the afternoon, and has tensile + haze data by end of day. This iteration speed is what turns a 6-month formulation project into a 6-week one.
Send us your material — we will blow a test film and send you the sample with process data.
Ship 2–5 kg of your masterbatch, compound, or resin to our lab. We will:
Run it on the same φ35mm lab machine you would purchase, at your specified thickness target
Record full process parameters: barrel zone temperatures, screw RPM, melt pressure, bubble stability observations
Ship back the blown film sample with a process report — no charge, no commitment
| Scenario | Material | Output / Run | Recommended Config |
|---|---|---|---|
| Daily QC batch release testing | LDPE + 5% white masterbatch | 2–4 kg/h, 20 min per test | Standard φ35mm screw, Φ30mm die, single-phase 220V inverter |
| R&D formulation screening | LLDPE + experimental additive at 5 concentration levels | 1–3 kg/h, 5 runs per afternoon | Standard screw + digital temperature recorder for run-to-run repeatability |
| Color card production for customer approval | LDPE + custom pigment blend | 3–5 kg/h, 3–5 color variants per session | Quick-change die adapter for fast color transition between runs |
| Academic teaching and demonstration | Virgin LDPE (easy processing grade) | 2–6 kg/h, 30–60 min lab session | Standard configuration with transparent safety guard for observation |
Material Loading: Pre-mixed pellets or compound (500g minimum) are loaded into the hopper. For masterbatch testing, the carrier resin and masterbatch are dry-blended at the target let-down ratio before loading.
Plasticizing: The φ35mm screw with 30:1 L/D conveys, compresses, and melts the material through three independently controlled heating zones. Zone temperatures are set per material — typically 140–170°C for LDPE, 160–190°C for PP carrier systems.
Melt Filtration: Molten polymer passes through a screen pack at the breaker plate, trapping contaminants and unmelted gels. Screen mesh can be changed to match the evaluation purpose — finer mesh for dispersion inspection, coarser for high-filler trials.
Film Blowing: Melt exits the Φ30mm spiral mandrel die as a tube. Low-pressure air inflates the tube into a bubble. The operator adjusts air volume and frost line height by observing bubble clarity, neck height, and stability — the same variables a production operator controls, but at visible scale.
Bubble Collapsing & Haul-Off: The bubble passes through a collapsing frame that flattens it into a double-layer film. Chrome-plated traction rollers (300mm width) pull the film upward at a controlled speed set via the VFD drive.
Winding: The flattened film winds onto a friction-driven core. Winding tension is maintained by the variable frequency motor, producing a wrinkle-free roll ready for thickness measurement, tensile testing, haze analysis, or customer inspection.
| Option | What It Does | Best For |
|---|---|---|
| Digital temperature data logger | Records barrel zone and die temperatures every second during the run, exportable as CSV | Labs requiring batch records for ISO 9001 or customer audit compliance |
| Interchangeable die set (Φ20mm / Φ40mm) | Swap die diameters for different blow-up ratios and film width ranges | Labs testing both narrow and wide film formats |
| Corona surface treatment unit | In-line corona discharge treatment of film surface to raise dyne level for printing/lamination adhesion | Labs evaluating printability of films, or producing samples for lamination trials |
| Water-cooled chill roll for cast film | Converts the machine between blown film and cast film modes for comparison studies | Labs needing to compare blown vs. cast film properties from the same material |
| Higher-torque motor (3.0 kW) | Increases screw torque for processing higher-viscosity materials (HDPE, filled PP) | Labs running high-filler or high-MW resin trials that stall the standard 2.2 kW motor |
| Single-phase 220V power configuration | Modifies electrical system for 220V single-phase supply instead of 380V three-phase | University labs or small QC rooms without three-phase power access |
| External air compressor kit | Provides bubble inflation air if the facility compressed air line is unavailable or contaminated | Standalone installations or mobile testing setups |
Location: Gujarat, India — masterbatch manufacturer serving the woven sack and packaging film sector
Machine: MY-LAB-35 Lab Film Blowing Machine (φ35mm, single-layer)
Application: QC release testing for TiO₂ white masterbatch (60% loading, LDPE carrier) and carbon black masterbatch (45% loading, LLDPE carrier)
Before: QC department tested masterbatch pellets only — MFI, density, and visual pellet inspection. Film dispersion was not tested in-house. Customer complaints about pigment specking occurred 2–3 times per quarter. Each complaint required: pull retained sample → send to third-party lab for film evaluation → 10-day wait for results → negotiate with customer. Average resolution time: 18 days.
After: Lab film blowing machine installed in QC lab. Every production batch now produces a standard 40μm LDPE test film at 5% let-down ratio within 20 minutes of batch completion. QC technician visually inspects film against a reference standard. Batches with visible pigment agglomerates are flagged for re-processing before shipment. Customer dispersion complaints: zero in the 14 months since installation.
Data: 3–5 tests per shift, approximately 600 batches per year processed through the lab machine, total annual operating cost (electricity + operator time + material for test films) under $3,000.
15+ years of film blowing machine manufacturing — we build production lines and lab machines, not a trading company reselling equipment. When you ask about screw geometry or die gap, you talk to engineers who designed the parts.
CE-certified electrical systems with Siemens/Schneider components. Every machine undergoes a 4-hour continuous run test with LDPE before crating — we catch bearing run-in issues and calibration drift before the machine leaves the factory.
Exported to 50+ countries across Southeast Asia, Middle East, Africa, and South America. We understand tropical ambient conditions (35°C+, 80%+ RH), voltage fluctuation, and dusty factory environments — and our electrical panels are built accordingly.
12-month warranty on mechanical and electrical components. Spare parts ship within 48 hours of diagnosis. We stock screws, barrels, heaters, and inverter drives for all current models in our spare parts warehouse.
Installation support via video call or on-site engineer. Lab machines ship with a detailed commissioning checklist — power up, zone temperature calibration, first-run procedure with LDPE. Most customers are blowing film within 4 hours of unboxing.
It handles LDPE, LLDPE, HDPE, PP, and their blends. It also processes filled compounds (CaCO₃, talc, BaSO₄) up to approximately 50% loading, depending on particle size and carrier resin. For EVA and metallocene-catalyzed resins, the 30:1 L/D screw provides adequate melting without excessive shear heating. This machine is not suitable for rigid PVC (requires corrosion-resistant screw and barrel) or biodegradable polyesters like PLA and PBAT (require specialized low-shear screw geometry — see our Biodegradable Film Blowing Machine for those applications).
500g is the practical minimum for producing a evaluable film sample. With 500g, you get approximately 5–10 meters of usable film at 50μm thickness and 150mm lay-flat width — enough for visual dispersion inspection, thickness measurement, and 5–6 tensile test specimens. For color matching where you need a larger sample for spectrophotometer measurement, 1–2 kg produces a film roll sufficient for multiple readings and a customer presentation swatch.
Partially. You can match production melt temperatures, blow-up ratio, and frost line height. However, shear rate and residence time differ from production-scale extruders due to the smaller screw diameter and lower RPM. Lab film tests are comparative — they reliably rank formulations relative to each other and catch gross dispersion failures — but absolute film property values (tensile MD/TD, haze, dart drop) will differ from production line results. This is inherent to all lab-scale blown film equipment, not specific to this machine.
Purge with approximately 300–500g of the next material or a dedicated purging compound. For dark-to-light color transitions (e.g., carbon black to white), we recommend a two-stage purge: first a mechanical purging compound to scrub the screw and barrel, then the next production material to flush residues. Total changeover time is 20–40 minutes. The die head disassembles in under 5 minutes for manual cleaning if pigment residue accumulates in the flow channel over extended use.
Standard configuration: 20–25 working days from order confirmation to crating. Machines with optional configurations (interchangeable dies, data logger, corona unit) add 5–10 working days. Sea freight to major ports adds 15–30 days depending on destination. Air freight is available for urgent orders — the machine fits on a standard air freight pallet.
Standard configuration: 380V, 50Hz, three-phase, 10 kW total installed power. A 220V single-phase configuration is available as an option for university labs and small facilities without three-phase power — output is reduced to approximately 60% of the three-phase rating on single-phase supply.
This φ35mm model is our standard lab machine, suitable for most masterbatch and compound testing applications. For labs needing even smaller sample sizes, we offer a φ25mm micro-extruder configuration (300g minimum, 0.5–3 kg/h). For pilot-scale trials that bridge lab results to production, see our PE Film Blowing Machine with φ45mm–φ55mm screw options. Contact our engineering team with your throughput and sample size requirements for a specific recommendation.
The machine arrives pre-assembled on a steel frame. Installation steps: (1) position and level the machine, (2) connect 380V three-phase power via the supplied terminal block, (3) connect compressed air at 0.6–0.8 MPa to the bubble inflation port, (4) run the first heat-up cycle empty to verify all three zones reach setpoint and hold within ±2°C, (5) load LDPE and run the first test bubble. We provide a video call walkthrough during commissioning. Most customers complete installation in under 4 hours with one technician. No foundation work, no cooling water plumbing, no crane required.
Daily: wipe down die lips after the last run to prevent polymer degradation residue. Weekly: check and clean the screen pack, inspect drive belt tension. Monthly: verify temperature controller calibration with an independent thermocouple probe, lubricate the traction roller bearings. Every 6 months: inspect screw and barrel for wear (order spare screw at first sign of diameter loss >0.2mm on the flight lands). The main consumables are screen packs (budget $2–5 each, change every 20–50 runs depending on material cleanliness), barrel heaters (2–3 year life), and the drive belt (annual replacement recommended).
We stock all wear parts and critical electrical components in our spare parts warehouse: screw and barrel assemblies, ceramic band heaters, solid-state relays, thermocouples, inverter drives, and drive belts. Standard parts ship within 48 hours via DHL/FedEx. A recommended spare parts kit (heaters, thermocouples, screen packs, drive belt, seals) is available for purchase with the machine — most labs keep this on hand and never experience downtime waiting for a part.
Tell us about your testing requirements and we will recommend the exact configuration with pricing within 24 hours.
Please include the following in your inquiry:
Primary materials you plan to test (resin type, masterbatch type, filler type and loading range)
Target film thickness range (e.g., 30–100 μm) and desired lay-flat width
Estimated number of test runs per week or per month
Available power supply (380V three-phase or 220V single-phase)
Any special requirements: data logging, corona treatment, cast film conversion, or interchangeable dies
Your delivery port and preferred shipping method (sea or air)
Email: carrie@jymingyang.com
Phone / WhatsApp: +86-139-6163-3728
We typically respond to detailed inquiries within 4 business hours (GMT+8). For urgent requests, WhatsApp is the fastest channel.
PE Film Blowing Machine — Production-scale mono-layer machines for LDPE, HDPE, and LLDPE film from 40 kg/h to 150 kg/h output. Suitable when lab testing validates a production process and you need to scale up.
ABA Film Blowing Machine — Two-layer co-extrusion with a high-percentage recycled material or CaCO₃-filled core layer. Ideal when your lab work identifies cost-saving formulations that require a multi-layer structure in production.
ABC Film Blowing Machine — Three-layer co-extrusion with independent temperature control per extruder. For barrier films, high-performance packaging, and applications where each layer uses a different polymer or additive package.
Biodegradable Film Blowing Machine — Specialized low-shear screw for PLA, PBAT, and starch-based compounds. Narrow processing window temperature control (±2°C). If your lab work involves biodegradable formulations, this machine matches your production intent.
High-Speed Film Blowing Machine — High-output mono-layer machines with dual-lip air ring and IBC (internal bubble cooling) for thin-gauge films at line speeds exceeding 80 m/min. For when lab trials confirm a recipe and you need to maximize output per kWh.
All Film Blowing Machines — Browse the complete range of film blowing equipment from lab-scale to high-output production lines.
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