Daily maintenance of a bubble film making machine is crucial for ensuring stable equipment operation, extending its service life, and reducing downtime due to malfunctions. Standardized maintenance procedures should be established for core components (such as the extrusion system, forming system, and transmission system) as well as auxiliary production links. Below are specific maintenance guidelines, categorized by equipment structure:
1. Extrusion System Maintenance (Core Energy-Consuming and Forming-Critical Link)
The extrusion system is responsible for melting and extruding PE pellets. Maintenance focuses on preventing raw material residue, avoiding component wear, and ensuring stable heating.
Screw and Barrel Maintenance
Daily Cleaning: After production, feed a small amount of raw material (or a dedicated cleaning compound) to expel residual molten material from the screw and barrel. This prevents solidification and 结块 when cooled, which could cause screw jamming or uneven raw material heating during subsequent startup. For long-term shutdowns, thoroughly clean the components and apply anti-rust oil.
Regular Wear Inspection: Weekly, check the screw surface for scratches or dents and the barrel's inner wall for smoothness. Wear can lead to uneven plasticization of raw materials and increased motor load. If wear is detected, replace or repair the parts promptly (inspect small machines every 1–2 years and large machines every 6 months).
Heating System Maintenance
Heating Coil/Electromagnetic Heater Inspection: Before daily startup, check that heating coils are secure and free of oil stains (oil impairs heat dissipation and causes local overheating). Ensure electromagnetic heating coils are undamaged to prevent short circuits.
Temperature Sensor Calibration: Monthly, use an infrared thermometer to verify that the sensor's displayed temperature matches the actual temperature (allowing a maximum error of ±2℃). If deviations are excessive, calibrate or replace the sensor immediately-temperature inaccuracies waste energy through overheating or result in insufficient raw material melting.
2. Forming and Traction System Maintenance (Critical for Bubble Quality)
The forming system (forming rollers, pressure rollers) and traction system directly affect bubble integrity and uniformity. Maintenance focuses on surface cleanliness, stable pressure, and smooth transmission.
Forming Roller and Pressure Roller Maintenance
Daily Cleaning: After production, wipe roller surfaces with a soft cloth dampened with warm water (or a neutral detergent) to remove residual film fragments or raw materials. Residue that solidifies can cause subsequent bubble defects like indentations or breakage. Avoid scratching roller surface patterns with hard brushes or sharp tools-pattern damage directly distorts bubble shape.
Pressure Calibration: Weekly, check if pressure roller pressure is uniform (judge by comparing bubble sizes on both sides of the film). If pressure is uneven, adjust the cylinder or spring pressure device. Uneven pressure causes inconsistent film thickness and increases scrap rates.
Traction and Guide Roller Maintenance
Surface Inspection: Daily, check traction and guide rollers for scratches or sticky residue. Remove sticky residue promptly to prevent film tearing or wrinkling.
Bearing Lubrication: Monthly, apply high-temperature grease to the bearings of traction and guide rollers to reduce friction and prevent increased motor load. Ensure rotation is smooth and free of jamming.
3. Transmission and Power System Maintenance (Ensures Stable Operation)
Motors, reducers, and conveyor belts are the "power sources" of the equipment. Maintenance focuses on lubrication, load monitoring, and abnormal noise detection.
Motor and Reducer Maintenance
Temperature and Noise Monitoring: After daily startup, touch the motor and reducer housings to check temperatures (normal operating temperature should not exceed 60℃). Listen for abnormal noises (e.g., "clicking" friction or "buzzing" overload sounds). If abnormalities are detected, stop operation immediately to avoid motor burnout or gear wear.
Lubrication Maintenance: For reducers, check oil levels every 3 months and replenish with the same type of lubricating oil (e.g., gear oil) if low. Lubricate motor bearings with grease every 6 months to prevent dry friction.
Conveyor Belt/Chain Maintenance
Tension Adjustment: Weekly, check belt or chain tension. Excessive slack causes slipping and reduced efficiency; excessive tightness accelerates wear. Adjust tension by repositioning idler pulleys-belts should deflect 1–2cm when pressed.
Cleaning and Lubrication: For chain-driven systems, monthly use a brush to remove dust and debris from chain links, then apply chain-specific lubricant. Choose non-dripping grease to avoid contaminating the film.
4. Auxiliary System Maintenance (Ensures Production Continuity)
Auxiliary systems (cooling, control) have low energy consumption but can cause full-line shutdowns if faulty.
Cooling System Maintenance
Cooling Water Circuit Cleaning: For water-cooled systems (e.g., forming roller cooling), monthly check for blockages (indicated by abnormal temperature differences in outlet water). Descale pipes every 3 months to prevent reduced heat dissipation efficiency and insufficient film cooling.
Fan/Water Pump Inspection: For air-cooled systems, clean fan filters weekly. For water pumps, monthly check impellers for debris to ensure unobstructed water flow.
Control System Maintenance
Electrical Cabinet Cleaning: Monthly, use compressed air to remove dust from electrical cabinets (preventing short circuits). Check for loose terminals, especially in heating system and motor connections.
Sensor and Instrument Calibration: In addition to temperature sensors, monthly calibrate pressure sensors (extruder pressure) and tension sensors (traction tension) to ensure accurate readings-excessive errors cause equipment malfunctions.
5. Daily Operational Guidelines (Reduces Human-Induced Wear)
Maintenance is enhanced by standardized operations to minimize equipment damage:
Preheat to the set temperature before startup (avoiding excessive screw load from cold starts). Do not start the screw during preheating.
Screen raw materials to remove impurities and lumps, preventing barrel or screw scratches or mold blockages.
Before shutdown, turn off heating, run the screw to expel residual material, then cut power (preventing raw material solidification in the barrel).
Consistent maintenance significantly reduces malfunctions (e.g., uneven heating, bubble breakage, motor overload), extends the lifespan of core components (screws, forming rollers, motors), and stabilizes bubble film quality. Long-term, proper maintenance reduces energy consumption (by minimizing rework from faults) and repair costs.
