How to Control Dispensing Volume? What Determines the Amount of Adhesive

1. Four Core Factors Determining Dispense Volume

The first is air pressure.

Pressure drives adhesive flow; all else equal, higher pressure means more adhesive — but excessive pressure overflows and splatters, while too little breaks the bead or skips dots.The second is dispense time

. The longer the valve stays open, the more adhesive flows; controllers typically set dispense time between 0.1 and 5 seconds.The third is needle inner diameter

. A larger tip orifice outputs more; as a rule, needle ID is about 1/2 the dot diameter, and the dot diameter about 1/2 the product pitch.The fourth is travel speed

. When drawing lines, the slower the travel, the more adhesive per unit length; travel speed must match the dispense rhythm or you get tails or breaks.2. Temperature Is the Hidden Variable

Adhesive viscosity is highly temperature-sensitive — epoxy viscosity roughly halves for every 10°C rise; in warm conditions adhesive thins and flows better, so the same pressure outputs more. Volume control therefore demands a stable ambient temperature; the ideal working range is

23-25°C20-25℃— for temperature-sensitive adhesives, use a heated constant-temperature barrel.

3. Tuning Order: Parameters First, Calibration Second

For actual debugging, follow this order:

Step 1, select the needle— choose the right gauge for the dot size;

Step 2, set pressure— start low, increase in small steps, watch for a continuous steady bead;

Step 3, set dispense time— verify by weighing: dispense a series of dots onto a scale, compare against the setpoint, and fine-tune until volume is on target;

Step 4, match travel speed— when drawing lines, keep the bead even without breaks. After every change, test on a few products before committing to a batch.

4. Troubleshooting Unstable Volume

If parameters are unchanged but volume drifts, investigate four directions:

1. The air supply— unstable pressure directly causes unstable volume; fit a filter-regulator on the line. Learn moreair compressor configuration。

2. The adhesive— settled filler and viscosity drift change output; stir filled adhesives slowly and evenly before use;

3. Needle and valve— a half-blocked needle or a worn valve seal leaking air are common causes of uneven volume;

4. Bubbles— air in the adhesive causes intermittent flow; degassing before use improves it markedly.

5. Equipment and After-Sales Support

Volume stability also depends on the machine's fluid-feed and control design. Boli vision dispensing machines control adhesive start/stop with the glue valve — fast, drip-free — with working pressure adjustable across 600-1200hpa; the i7 industrial PC and motion control card compute and execute dispensing parameters, guaranteeing repeat-run consistency once set. If your own troubleshooting stalls, use the unlimited remote after-sales service to have an engineer help diagnose. Learn morejet dispensing。

6. Summary

Dispense volume is jointly determined byair pressure, dispense time, needle inner diameter and travel speed, with temperature the hidden viscosity variable. Tune in the order 'select needle — set pressure — set time and verify by weighing — match speed'; when volume drifts, check the air supply, adhesive, needle/valve and bubbles. Learn more1. The Frame Is the Foundation of Precision。