Biaxially oriented polypropylene (BOPP) film is widely used in various fields, and its production accuracy directly determines product competitiveness. The BOPP film melt gear pump, as the core equipment of the production line, is installed between the extruder and the die head, playing the dual roles of "pressure stabilizer" and "flow regulator". It is made of alloy material and is suitable for conveying high-temperature melt at 200-300 ℃. Its operating accuracy plays a decisive role in the film quality, production efficiency, and energy consumption.
1、 Core application scenarios and core roles
Precise material control ensures thickness stability: relying on precision gear meshing structure, the fluctuation of melt flow rate is strictly controlled within ± 1%. Some high-precision models can achieve ± 0.5% flow fluctuation control, avoiding defects such as uneven film thickness and longitudinal stripes from the source, and ensuring that the thickness tolerance of the finished product is stable and meets the strict industry standard of ± 1%.
Stable pressure buffering optimizes melt performance: effectively absorbs pressure shocks caused by fluctuations in extruder screw speed and uneven melting of raw materials, and controls melt pressure fluctuations within ± 1%; The shear mixing effect of gear meshing can refine crystal points, eliminate bubbles, significantly improve melt uniformity, and provide a stable rheological basis for subsequent biaxial stretching processes.
Division of labor to reduce burden and achieve consumption reduction and efficiency improvement: Independently undertake the tasks of melt conveying and pressurization, allowing the extruder to focus on material plasticization without excessively increasing the speed to meet the die pressure requirements, significantly reducing screw mechanical wear and motor operating load, reducing the interference of raw material temperature and humidity fluctuations on production continuity, and achieving dual improvement in production line efficiency and yield.
2、 Exclusive technical features adapted to BOPP production line
Extreme working condition adaptability: The specialized model can operate continuously for 8000 hours without maintenance under high temperature of 300 ℃ and high pressure of 35MPa. The gear mesh clearance is only 1/5 of the diameter of the hair, which is suitable for the high load demand of BOPP production line 24-hour uninterrupted production.
High precision temperature control design: Using tungsten cobalt hard alloy lining and double-layer water cooling structure, the pump temperature rise can be controlled within ± 1 ℃ under continuous working conditions, avoiding large fluctuations in melt temperature that cause an increase in film haze and ensuring a stable film transmittance of over 92%.
High volumetric efficiency performance: After nitriding treatment, the surface hardness of the helical gear set can reach HRC62. With pressure compensation design, the volumetric efficiency is increased from the conventional 88% to 96.7%, and energy consumption can be saved by about 120000 kWh per 10000 tons of BOPP film produced.
3、 Product performance improvement brought by application
The mechanical properties of the film have been significantly optimized: the longitudinal tensile strength can reach 180MPa, and the transverse tensile strength can reach 250MPa, which is 15% -20% higher than traditional process products. The impact strength can still maintain over 85% of the room temperature value in a low temperature environment of -50 ℃.
The adaptability of high-end products has been greatly enhanced: for harsh scenarios such as capacitor films used in new energy vehicles, the thickness uniformity can be controlled within ± 1.5%, and the dielectric strength can exceed 450V/μ m, directly extending the service life of thin film capacitors.
Short comprehensive income recovery cycle: By reducing the output of defective products, minimizing equipment wear and tear, and saving energy consumption, multiple benefits can be obtained. After installing a melt booster pump on the production line, the equipment investment cost can usually be recovered within six months or even shorter.
Email: sale@meltpump.com
WhatsApp: +86 158 3833 1071
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TEL：+86 371 67991755
WhatsApp： +86 158 38331071
Adress: No.22 Dongqing Str., High & New Technology Development Zone, Zhengzhou, China.
