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The liquid level of the adhesive pool on the book binding line and sealing line directly affects the stability of the adhesive: low liquid level → intermittent adhesive release, uneven adhesive layer; Excessive liquid level → overflow of glue, accelerated aging of glue solution. The three mainstream liquid level control methods each have their own advantages and disadvantages.
| way | Principle | Accuracy | Applicable adhesive type | Price | Maintain |
|---|---|---|---|---|---|
| Float ball type | Float ball triggers switch as liquid level rises and falls | ±10mm | EVA/APAO | low | Floating ball is prone to jamming and stagnation |
| Photoelectric type | Infrared/laser reflection detection of liquid level | ±3mm | all | middle | The lens needs to be anti fog |
| Weighing formula | Weigh the total weight of the glue tank and glue solution to calculate the liquid level | ±1mm | all | tall | Almost maintenance free |
Small graphic and text store (2L glue pot) → Floating ball type is sufficient, cheap and simple. Medium sized adhesive assembly line (5-10L) → The photoelectric type has the highest cost-effectiveness and meets the precision requirements. Large continuous production line → Weighing is the most stable, maintenance free, and has the highest accuracy. Sunlifehot melt adhesive pelletsIt can operate stably in all three liquid level control systems.
Q: What if the float gets stuck?
A: After stopping the machine, remove the floating ball to clean the carbides and check the flexibility of the shaft. It is recommended to check every 2 weeks, as more frequent checks are needed for particles with high carbide content.
Q: Is the photoelectric type accurate in high-temperature steam environment?
A: Steam above the glue pool will interfere with the photoelectric signal. It is recommended to install a blowing dust removal and anti fog device at the detection window, or choose a weighing scheme.
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