BOPP plastic film extrusion melt pumps

BOPP (bi-oriented polypropylene) plastic film is widely used in packaging, printing and other fields, and its production process requires high precision and stability of equipment. As one of the core equipments in BOPP film production line, extrusion melt pump plays a key role in ensuring product quality and improving production efficiency. The following is a detailed introduction from its function, technical characteristics, application advantages and development trends:

First, BOPP plastic film extrusion melt pump function

Pressure stabilization and flow control

BOPP film production, extruder output melt pressure fluctuations can lead to uneven film thickness. The melt pump realizes the stabilized pressure delivery of the melt through gear meshing, which controls the pressure fluctuation within ±0.5% and ensures that the film transverse thickness deviation (CD value) is lower than ±1.5%, meeting the stringent requirements of high-end packaging materials for thickness consistency.

Improvement of metering precision

The melt pump's displacement accuracy can reach ±0.3%, which, together with the closed-loop control system, can accurately control the grammage and width of the film. For example, in the production of laser transfer film, the pump body realizes nano-scale coating thickness adjustment through a special shear control function to guarantee the stability of optical effect.

Enhanced process adaptability

Melt pumps can handle polypropylene melts with viscosities ranging from 500-3000 Pa-s and system pressures of 15-30 MPa, adapting to different formulations and process requirements. For example, when processing matte BOPP containing fillers, the pump body extends the wear life by more than 30% by optimizing the gear material and clearance design.

Second, BOPP plastic film extrusion melt pump application advantages

Increased production efficiency

Melt pumps used in tandem with single-screw or twin-screw extruders can reduce the energy consumption of the whole production line by about 25%. For example, in a large production line, several small and medium-sized extruders are fed centrally by melt pumps, which can reduce the equipment footprint and simplify the process.

Product quality assurance

In high-speed stretching (line speeds up to 500 m/min) and multilayer co-extrusion processes, the melt pump's pressure stabilizing function prevents defects such as “sharkskin” and “crystal dots” from appearing in the film. For example, in the production of electronic packaging films, the pump optimizes the sealing structure to raise the cleanliness level to ISO Class 5, which meets the material purity requirements of the semiconductor industry.

Cost optimization

The energy saving effect of melt pumps is remarkable. For example, in a BOPP film enterprise with an annual production capacity of 4 million tons, the use of high-efficiency melt pumps can reduce the energy consumption of a single ton by 10-15%. In addition, longer pump life and shorter maintenance times (e.g. online ultrasonic cleaning systems reduce maintenance time to 2 hours) further reduce operating costs.

Third, BOPP plastic film extrusion melt pump application advantages

Increased productivity

Used in tandem with a single or twin-screw extruder, melt pumps can reduce the energy consumption of the entire production line by about 25%. For example, in a large production line, several small and medium-sized extruders can be fed centrally by melt pumps, which reduces the equipment footprint and simplifies the process.

Product quality assurance

In high-speed stretching (line speeds up to 500 m/min) and multilayer co-extrusion processes, the melt pump's pressure stabilizing function prevents defects such as “sharkskin” and “crystal dots” from appearing in the film. For example, in the production of electronic packaging films, the pump optimizes the sealing structure to raise the cleanliness level to ISO Class 5, which meets the material purity requirements of the semiconductor industry.

Cost optimization

The energy saving effect of melt pumps is remarkable. For example, in a BOPP film enterprise with an annual production capacity of 4 million tons, the use of high-efficiency melt pumps can reduce the energy consumption of a single ton by 10-15%. In addition, longer pump life and shorter maintenance times (e.g. online ultrasonic cleaning systems reduce maintenance time to 2 hours) further reduce operating costs.

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