The energy consumption distribution of bubble film making machines is closely linked to their production processes (such as raw material melting, bubble forming, traction, and winding). Among these, heating and power drive are the core energy-consuming links. Meanwhile, the industry has developed various energy-saving designs to reduce operating costs. Here is a detailed analysis:
I. Main Energy-Consuming Links of Bubble Film Making Machines (Sorted by Energy Consumption Ratio)
1. Heating System (Accounting for Approximately 50%-60% of Total Energy Consumption)
This is the most energy-intensive link. Its core function is to melt PE pellets (such as LDPE and LLDPE) into a moldable melt. It includes:
Extruder Heating: The temperature of the barrel is raised to 150-200°C (within the melting point range of PE) via heating rings (resistance or electromagnetic heating) outside the barrel, converting raw materials from a solid to a molten state. This process requires continuous heat supply. For large-scale equipment (producing wide-width bubble film), the heating power can reach several tens of kilowatts.
Die Heating: The die is a key component for melt extrusion molding. It must maintain a stable temperature (within ±2°C) to ensure uniform melt fluidity and prevent uneven thickness on the film surface. The heating power of the die typically accounts for 20%-30% of the total energy consumption of the heating system.
The energy consumption of the heating system is directly related to raw material melting efficiency. Uneven heating or low temperature control accuracy can lead to energy waste (e.g., repeated heating) and affect product quality.
2. Power Drive System (Accounting for Approximately 25%-30% of Total Energy Consumption)
This system drives the operation of various moving parts of the equipment. Its core components include:
Extruder Motor: It drives the screw to rotate, pushing and compacting the molten raw materials forward. The motor power depends on the extrusion volume-5-10kW for small machines and 20-50kW for large machines. It is the primary energy consumer in the power system.
Forming Roller Drive Motor: It drives the forming roller (with bubble-shaped grooves on its surface) to rotate and, in conjunction with the pressure roller, presses the melt into a bubble structure. A stable rotation speed is required to ensure consistent bubble formation.
Traction and Winding Motor: It pulls the formed bubble film and winds it into rolls. The tension must be adjusted according to the film thickness to prevent stretching or wrinkling of the film surface.
The energy consumption of the power drive system is positively correlated with the equipment's operating speed. During high-speed production, motor load increases, leading to higher energy consumption. However, the energy consumption per unit output is usually lower due to higher efficiency.
3. Auxiliary Systems (Accounting for Approximately 10%-15% of Total Energy Consumption)
Cooling System: Coolant or cooling fans are used to cool the formed bubble film (solidifying the PE melt). Although the energy consumption of cooling water pumps or fans is low, they need to operate continuously.
Temperature Control and Control Systems: PLC control cabinets, sensors (e.g., temperature and pressure sensors), etc., maintain stable equipment operation. Their energy consumption is low but essential.
II. Energy-Saving Designs and Effects of Bubble Film Making Machines
1. Energy Saving in the Heating System
Replacing Resistance Heating with Electromagnetic Heating: Traditional resistance heating has a thermal conversion efficiency of only 50%-60%. Electromagnetic heating, which uses electromagnetic induction to heat the barrel itself, increases thermal efficiency to over 90%, reducing energy consumption by 30%-40%. It also heats up faster, shortening pre-startup warm-up time.
Zoned Temperature Control and Intelligent Temperature Regulation: The extruder barrel and die are divided into multiple heating zones. Sensors monitor temperatures in real time, and only low-temperature zones are supplemented with heat (avoiding continuous heating of the entire system). This is particularly effective for reducing energy waste in small-batch production.
Waste Heat Recovery Devices: These collect waste heat emitted by the heating system (e.g., heat dissipation from the barrel surface) for preheating raw materials or heating workshops, further reducing energy consumption by approximately 10%.
2. Energy Saving in the Power Drive System
Using Variable Frequency Motors Instead of Ordinary Motors: Extruders, traction motors, and other components adopt frequency conversion technology, allowing speed adjustment based on production requirements (e.g., film width and thickness) instead of full-speed operation. This reduces energy consumption by 20%-30% during no-load or low-speed operation. It also reduces current impact during motor startup, extending equipment lifespan.
Servo Drives and Precise Matching: Forming rollers and winders use servo motors. PLCs precisely control the speed and its matching with extrusion and traction speeds, avoiding film waste caused by speed deviations (indirectly reducing energy consumption from rework).
3. Energy Saving Through Process Optimization
Efficient Screw Design: New screw designs (e.g., barrier screws) improve raw material melting efficiency, shorten melting time, and reduce heating energy consumption. They also reduce screw rotation resistance, lowering motor load.
Recycling in Cooling Systems: Cooling water uses a closed circulation system (equipped with cooling towers) to avoid water waste. Some equipment uses waste heat from cooling to preheat raw materials, achieving secondary energy utilization.
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Zhejiang Youjia Machinery Co.,Ltd
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+8618958800156
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No.557, East Three Road, Gexiang New Area, Nanbin Street, Rui'an, Wenzhou, Zhejiang, China
