Small beads of adhesive not seen around panels while being pressed.
| CAUSE |
SOLUTION |
| Non-Uniform or Insufficient Pressure
| Do not use stock when dimensions vary. |
| Be sure press platens are not out of line causing uneven pressure. |
| Insufficient Adhesive Spread
| Check proper mixing proportions of adhesive by weight when a two part system is used. |
| Do not use adhesive beyond its working life. |
| Recover and/or regroove worn spreader rolls. |
| Replace worn bearings on spreader rolls if needed. |
| Use proper roll grooving and the required spread rate for type of adhesive used. |
| Spreader rolls must be parallel with each other and with doctor rolls. |
| Keep spreader rolls clean of dried adhesive. |
| Be sure top and bottom rolls apply an equal spread of adhesive. |
| Fast operation of spreader may cause foaming of adhesive. |
| Soft and porous stock may need heavier spread rate than dense stock as adhesive can soak in too quickly. |
| Assembly Time Too Long/Precure
| Do not let open containers of adhesive stand for several hours before use. |
| Check proper mixing proportions of adhesive by weight when a two part system is used. |
| Apply proper spread for adhesive being used. |
| Soft and porous stock may need heavier spread rate than dense stock as adhesive can soak in too quickly. |
| Shorten assembly time. |
| If unable to shorten assembly time, increase spread rate. |
| Assembly times should coincide with plant temperature. |
| Moisture content of core and face sheet should be 6% to 10% to avoid excessive soak-in of adhesive. |
