From Lab to Production: Validate PVA Water‑soluble Film Blowing at Laboratory Scale
The traditional LDPE and EVA packaging film market has long been mired in intense price competition, with transparent raw material costs and razor‑thin margins. Many film processors, R&D institutions in new materials, and chemical companies are now seeking breakthrough opportunities for transformation and upgrading. Eco‑friendly, biodegradable, and water‑soluble functional packaging has emerged as a new frontier in the packaging industry.
Turn PVA R&D from a “high‑stakes gamble” into “light entrepreneurship” – validate it right in your lab.
In a recent real‑world case, a customer sent us a PVA‑modified compound and conducted trials on POTOP laboratory‑scale precision blown‑film machine.
Under the conditions of 195–215 °C, screw speed 100 rpm, and line speed 6 m/min, the material processed smoothly, and we successfully collected films of several different thicknesses—fully demonstrating the machine’s compatibility with PVA materials.
POTOP laboratory‑scale blown‑film experimental machine delivers value in the following aspects:
✅ Custom‑designed 25 mm extrusion screw for stable plasticization within narrow processing windows
The machine is equipped with a dedicated 25 mm‑diameter extrusion screw with a 28:1 length‑to‑diameter ratio. Optimized shear‑mixing geometry is tailored for high‑viscosity PVA melts, effectively eliminating unmelted particles and melt streaks. The screw is independently servo‑driven with infinitely adjustable rotational speed from 0 to 120 rpm to ensure stable extrusion output. Independent segmented PID temperature control delivers ±1 °C precision across a working range from ambient temperature up to 350 °C. It satisfies PVA’s strict thermal requirements and prevents thermal degradation and charring. Extrusion pressure ranges from 0 to 50 MPa with 0.5 %FS pressure‑measurement accuracy. Real‑time melt‑condition monitoring provides early warning against forming defects.
✅ Precision die head + vector intelligent air ring to resolve film‑bubble forming challenges
Common industry challenges for PVA blown‑film processing include unstable bubble oscillation, slow cooling‑setting and large film‑thickness deviation. This unit integrates a high‑precision blown‑film die paired with an aluminum‑alloy DC vector air ring. The film‑frame supports electric lifting for easy film threading. Uniform circumferential air‑flow rapidly cools the bubble, yielding smooth‑surface films with greatly improved thickness uniformity and defect‑free PVA water‑soluble films
✅ PLC intelligent touch‑screen system for traceable full‑process experimental data
A high‑definition touch‑screen HMI integrates full‑system controls for extrusion, lifting, traction and winding. Real‑time temperature readings and melt‑pressure curves are displayed. All experimental parameters are automatically logged, and fault‑alarm pop‑ups are supported. Archived test data can be exported. Researchers can directly compare film‑forming performance under different screw speeds, temperatures and traction speeds, greatly simplifying comparative formulation experiments.
✅ Integrated bench‑top unit: low‑cost laboratory R&D tool
Unlike large‑scale production equipment, this compact bench‑top unit is fitted with casters for flexible relocation. It requires no large‑dedicated plant space and fits inside standard laboratories. Each test consumes only small‑volume raw materials with short test cycles and low energy consumption. Fast parallel comparison of multiple formulations and additives is supported, cutting R&D trial‑and‑error costs by over 70 %. Multiple safety protections including overload protection, high‑temperature protection and emergency stop ensure stable and safe long‑run laboratory operation.
If you are seeking breakthrough solutions for PVA‑film R&D and would like quotations, technical proposals or customization services, please contact us for one‑on‑one professional consultation and tailored solutions.
