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EspañolCore Difference Comparison between Single-Screw and Double-Screw Film Blowing Machines (Analysis of Structure, Performance and Application)
1. Basic Structure and Core Design
|
Item |
Single-Screw Film Blowing Machine |
Double-Screw Film Blowing Machine (Taking ABA/AB Type as an Example) |
|
Screw Configuration |
Single screw driven by a single motor |
Two screws driven independently or cooperatively by two motors |
|
Layer Structure |
Single layer through the die head compounding (actually still using a single raw material) |
Double layers (AB type) or three-layer sandwich (ABA type), with each layer of raw material extruded independently |
|
Core Function |
Plasticizing of a single raw material (such as HDPE/LDPE, etc.), focusing on basic uniformity |
Compound of multiple raw materials (new material for layer A + recycled material/filler for layer B), achieving "functional layering" or "cost layering" |
2. Raw Material Processing and Plasticizing Capacity
|
Item |
Single-Screw Film Blowing Machine |
Double-Screw Film Blowing Machine |
|
Raw Material Type |
Single raw material (pure new material or first-grade recycled material, not supporting the mixing of raw materials with large differences) |
Supporting two types of raw materials (high-quality material for layer A + low-cost material for layer B, such as recycled material, calcium carbonate, with a filling ratio of 30%-60%) |
|
Plasticizing Characteristics |
Simple screw structure (such as the equal pitch and gradually changing type), suitable for raw materials with good fluidity |
Differentiated screw design (the screw for layer A has a large length-diameter ratio for main plasticizing, and the screw for layer B is short and thick for conveying materials), and the die head runner is optimized to prevent delamination |
|
Adaptability to Recycled Materials |
Only supporting first-grade recycled materials (with few impurities and fluidity close to that of new materials) |
The ABA type can directly use second-grade recycled materials (the middle layer is wrapped and does not affect the surface quality) |
3. Comparison of Performance Advantages
|
Item |
Single-Screw Film Blowing Machine |
Double-Screw Film Blowing Machine |
|
Cost Advantage |
- Low equipment procurement cost (30%-50% lower than that of double-screw machines) - Simple maintenance (single motor, no complex die head) |
- Low raw material cost (high proportion of filler in the middle layer, for example, the cost of the ABA type is 50% lower than that of the single layer) - Better film performance (strength and surface quality are superior to those of the single layer) |
|
Production Capacity and Efficiency |
Production output is 1-2 tons per day and the single motor drive has high stability |
The production output is 30%-40% higher than that of the single-screw machine and the synchronous feeding of the double screws is more efficient |
|
Function Expansion |
Only basic functions (such as vest bags, agricultural films) |
Supporting surface optimization (layer A maintains gloss/printability) + cost reduction of the inner layer (filling in layer B), or function enhancement (antistatic, stiffness) |
4. Typical Application Scenarios
|
Item |
Single-Screw Film Blowing Machine |
Twin-Screw Film Blowing Machine |
|
Applicable Products |
- Low-end packaging: garbage bags, fruit bags, industrial inner liners - Agricultural films: mulch films, simple greenhouse films - Low requirements for recycled materials: only using first-grade recycled materials |
- Supermarket packaging: vest bags, continuous roll bags (new material for layer A for printing, recycled material for layer B to reduce costs) - Heavy packaging: fertilizer bags, feed bags (filling in layer B to enhance stiffness) - Quality requirements: clear printed logo, passing supermarket quality inspection (no surface defects) |
|
Thickness Range |
0.01-0.2mm (covering thick films to thick membranes) |
0.02-0.15mm (focusing on medium-thickness films, the ABA type is suitable for 0.02-0.05mm ultra-thin bags) |
|
Factory Positioning |
The first choice for new factories (with limited budget and producing general-purpose films) |
Advanced factories (needing to control costs and improve quality, such as transitioning from producing garbage bags to supermarket bags) |
5. Summary of Core Differences
•Structural Essence: The single-screw machine is "a single raw material working alone", while the twin-screw machine is "two/three layers of raw materials working in a division of labor";
•Cost Logic: The single-screw machine saves money on equipment, and the twin-screw machine saves money on raw materials (the higher the proportion of filler, the more cost-effective it is);
•Performance Bottleneck: The single-screw machine cannot compound different raw materials (such as requiring gloss on the surface and cost savings on the inner layer), and the twin-screw machine breaks through the limitations through layering;
•Applicable Threshold: The single-screw machine is suitable for "getting started without much knowledge", and the twin-screw machine is suitable for "those who know some technology and want to make money" (for example, using recycled materials to save costs while passing the quality inspection).
Selection Suggestions
•Choose the Single-Screw Machine:
✅ Tight budget (low equipment + maintenance costs)
✅ Only producing general-purpose films (vest bags, agricultural films, etc.)
✅ Single raw material (pure new material or first-grade recycled material, without mixing fillers)
•Choose the Twin-Screw Machine (ABA/AB Type):
✅ Wanting to reduce raw material costs (using second-grade recycled materials, high-proportion calcium carbonate)
✅ Products requiring surface quality (printing, gloss) while saving money on the inner layer
✅ High production output requirements (more than 30% higher production capacity than the single-screw machine)
Summary in One Sentence: The single-screw machine is the "basic model that meets the basic needs", and the twin-screw machine is "spending money on equipment, saving money on raw materials, and making money from quality".
