Blown film machine

First, align with material & application: Single-screw suits single raw materials (e.g., pure PE) for basic packaging (shopping bags) due to simple structure; double-screw fits mixed/modified materials (filled, blended resins) for functional films (barrier/heat-resistant) via better mixing.

Second, check key parts: Single-screw needs proper L/D ratio (25:1-30:1) for melting; double-screw requires suitable meshing type (tight/loose) for uniform dispersion.

Third, assess performance: Match output to capacity; verify film thickness consistency (single-screw) and material homogeneity (double-screw).

Finally, pick suppliers with timely after-sales to reduce downtime.

First, define application scenarios: AB (double-layer co-extrusion) suits basic composite needs (e.g., general packaging with mild barrier) via two different materials; ABA (A=outer layers, B=inner layer) optimizes cost/strength for ordinary uses (e.g., shopping bags) with same outer materials.

Second, check core components: Select wear-resistant screws (e.g., 38CrMoAl) and high-precision dies to ensure stable extrusion and uniform film.

Third, evaluate performance: Match output to production demand; verify film thickness consistency, tensile strength, and transparency—key for quality.

Finally, confirm after-sales & efficiency: Choose suppliers with timely technical support; prioritize energy-saving models to cut long-term costs.

To choose between ABA and ABC film blowing machines, focus on 4 core factors:

1. Material Needs: Pick ABA if you only use 2 raw materials (e.g., blending virgin & recycled PE, with recycled material in the middle layer to cut costs). Choose ABC for 3 distinct materials (e.g., adding a barrier layer like EVOH for moisture/oxygen resistance).

2. Product Function: ABA suits general films (shopping bags, protective films) with basic strength/transparency. ABC is for specialized films (food packaging, medical films) needing enhanced performance (barrier, puncture resistance).

3. Cost & Complexity: ABA has lower equipment/raw material costs and simpler maintenance. ABC costs more (3 extruders vs. 2 for ABA) and requires more operational expertise.

4. Production Flexibility: ABA is ideal for large-volume standard films; ABC fits custom, high-value films.

Align your choice with your target film’s function, material types, budget, and production scale.

The cooling system can be adjusted by controlling the air speed and temperature of the air ring. Proper cooling ensures the quality of the film and prevents shrinkage or deformation of the film after molding.

Blown film machines can produce different types of plastic bags such as shopping bags, garbage bags, food bags, courier bags, shrink bags, etc., which are suitable for the packaging needs of various industries.

When selecting a blown film machine, you need to consider factors such as material type, film thickness, output requirements, accuracy of the control system, and the stability and energy efficiency of the machine.

Film thickness can be controlled by adjusting the extruder temperature, the position of the wind ring, and the haul-off speed. Film thickness uniformity can also be optimized by adjusting the airflow and cooling system of the blown film machine.

Efficiency can be improved by using high efficiency motors, optimizing temperature control systems, using high quality raw materials, and regular machine maintenance to ensure smooth operation.