Three-Layer Coextrusion Blown Film Machine Model Selection

Three-Layer Coextrusion Blown Film Machine Selection

This machine is core equipment for plastic packaging. Unlike single-layer models, it composites multi-functional materials for superior strength, barrier and printability, widely used in food, pharmaceutical, agricultural and industrial stretch film production. Poor model matching causes low output, defective products and wasted costs, so multi-factor evaluation is essential.

1. Product Application & Film Performance

Requirements vary by use:

Food heat-seal film: Inner heat-seal layer, oxygen/moisture barrier middle layer, printable outer layer; equip precise coextrusion distributors for even lamination and no delamination.

Agricultural mulch film: Middle layer mixed with anti-aging masterbatch; screws with strong shearing for uniform dispersion.

Stretch wrapping film: Die head wall thickness tolerance controlled within ±5% for even stretching.

2. Capacity Matching via Core Parameters

Screw diameter, die size and haul-off speed determine throughput:

Small workshops (<100 tons/year): Φ45–50mm screw, Φ800–1200mm die, 60–120kg/h output for small-batch customization.

Medium factories (>500 tons/year): Φ65–75mm screw, Φ1500–2000mm die, 200–350kg/h output for mass standard orders.

For doubled capacity in 2–3 years: Choose upgradable screws and expandable dies to avoid frequent equipment replacement.

3. Raw Material Compatibility & Automation

Material fit: Standard chrome alloy screws suit PE/PP; corrosion-resistant barrels/screws required for biodegradable PLA/PBAT to prevent abrasion.

Automation tiers: Budget manual thickness adjustment for small plants; medium/large lines adopt on-line thickness gauges, AFC auto thickness control and auto winding tension systems, cutting waste by 3–5% and lowering labor.

4. Brand & After-Sales Support

Domestic top brands (Dalian Huagong, Guangdong Jinming) feature mature coextrusion, high-precision rotating dies and quick local after-sales service. Imported units perform better but cost over 30% more with slow spare parts delivery, fit only large custom manufacturers. Low-cost no-name equipment has high failure rates and short service life, raising total operational expenses long-term.

Conclusion

Prioritize demand matching instead of over-specification. Select cost-effective, proven machines aligned with product positioning, output volume, raw material plans and service access to boost quality, efficiency and long-term profitability.