Two-Color Striped Blown Film Machine
Blown film extrusion line for producing multi-colored striped LDPE/HDPE films without printing
The two-color striped blown film machine is designed for manufacturing PE films with two-color or multi-color stripe patterns. Its core advantage lies in color formation without printing, which simplifies the colored film production process and eliminates printing-related steps.
The striped blown film machine supports processing of LDPE and HDPE materials. By using two extruders in combination with a specially designed die head, clear and consistent color stripes are formed directly during extrusion, meeting diverse visual and functional requirements. The produced films are widely used in consumer packaging and industrial protection applications, offering stable mechanical performance and enhanced visual appearance while reducing printing costs and improving overall packaging value.
Daily-use packaging
garbage bags, shopping bags
Agricultural applications
light-blocking and weed-control mulch films
Food packaging
snack bags, bread bags, fruit freshness bags
Product parameters
| Item | Specification |
| Film material | LDPE / HDPE (compatible with material blending) |
| Stripe pattern | Dual-color stripes (width and color customizable) |
| Film thickness | 0.012-0.25mm (customizable) |
| Film width | 600-2800mm (customizable) |
| Stripe width tolerance | ≤1mm |
| Tensile strength (MD / TD) | ≥16MPa /≥13MPa |
| Elongation at break (MD / TD) | ≥520% /≥420% |
| Light transmittance (standard striped film) | ≥88% |
| Tear strength | ≥22N/mm |
Equipment parameters
| Item | Specification |
| Extruder configuration | 2 single-screw extruders |
| Screw material / treatment | 38CrMoAl, nitrided (surface hardness≥HV900) |
| Screw diameter | 55-85mm (same specification for both extruders) |
| Single extruder output | 40-180kg/h |
| Co-extrusion die type | Special striped-film die (replaceable die core for stripe adjustment) |
| Cooling method | Labyrinth air ring (adjustable air volume) |
| Haul-off speed | 6-45m/min |
| Winding system | Torque motor winding (automatic tension control) |
| Winding diameter | ≤800mm |
| Main motor power (per extruder) | 11-45kW (depending on machine configuration) |
| Total installed power | 35-95kW (depending on machine configuration) |
| Machine dimensions (L×W×H) | 7000×2500×4800mm-11000×3200×6200mm (depending on machine configuration) |
| Control system | PLC+touch screen (synchronized dual-extruder control and fault alarm) |
Two-color material handling system
Two independent material hoppers combined with dual automatic feeding units store and feed the two color materials separately, preventing cross-contamination during processing.
Uniform cooling system
A labyrinth-type air ring together with cooling fans provides uniform bubble cooling, ensuring clear stripe definition and a flat film surface.
Haul-off and flattening system
The haul-off unit works in combination with gusset boards and four sets of flattening rollers to ensure stable film transport, eliminate wrinkles, and prevent stripe deviation.
Torque-controlled winding system
A torque motor-driven winder equipped with 0.1% accuracy tension sensors enables constant-tension winding with a maximum coil diameter of ≤500mm, while allowing fast reel changeover.
Electrical control system
A PLC with a 10-inch touchscreen integrates dual-extruder synchronized control, temperature monitoring, and fault alarm functions with a response time of ≤1 second, enabling fully automated operation throughout the process.
- Stripe formation without printing
A specially designed die head enables direct stripe formation during extrusion, eliminating printing processes, shortening production cycles by over 30%, reducing costs by more than 25%, and avoiding ink-related contamination. - High durability
Nitrided 38CrMoAl screws with surface hardness≥HV900 extend service life by more than 50% compared with conventional materials. - Excellent cooling uniformity
The labyrinth-type air ring ensures uniform bubble cooling, limiting stripe deformation to ≤ 5% and improving stripe clarity by approximately 40%. - Low operation threshold
PLC and touchscreen control synchronize dual extruders, allowing operators to become fully independent after 1-2 days of training, reducing labor costs by approximately 20%.