No transfer or spotty transfer of adhesive from core to face sheets or edge to edge. Spread marks show on substrate. Pieces do not stick together.
| CAUSE |
SOLUTION |
| Improper Adhesive Mix, (Mix is Thin, Foamy, or Heavy)
| Check proper mixing proportions of adhesive by weight when a two part system is used. |
| Insufficient or Non-Uniform adhesive Spread
| Do not allow open container of adhesive to stand for several hours before use. |
| 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. |
| Assembly Time Too Long
| Shorten assembly time. |
| Increase spread rate. |
| Porous Core Stock
| Porous stock may need heavier spread rate than dense stock as adhesive can soak in too quickly. |
| Low Moisture Content
| Moisture content of core and face stock should be 6% to 10%, veneers 3% to 6%, to avoid excessive soak-in of adhesive. |
