Analysis and solution of common problems in edge banding hot melt adhesive

发布时间：2021-05-26 0

In the process of using glue, due to changes in various situations, various problems will be encountered. To solve these problems, it is necessary to have a comprehensive understanding and comprehensive analysis of various factors. "Strength" to understand clearly: temperature (substrate temperature, glue tank temperature, glue roller temperature, ambient temperature), humidity (environment, plate), thickness (edge banding, glue), speed (opening, curing, feeding) , Surface degree (cutting accuracy, roughness), pressure (size and direction), mechanical force (cutting force size, direction), and then make specific analysis based on specific issues:

1. Loosen after bonding

1) Substances that cause degumming are released from the bottom of unqualified edge bands;

2) Unqualified PVC edge-sealing primer (medium) is not compatible with hot melt adhesive;

3) The oily veneer edges are bonded with incompatible hot melt adhesives;

5) The cause is caused by the hot melt adhesive being cold (rapidly cooling down) during the bonding process. Stable bonding conditions (including temperature, pressure, and working speed, etc.) should be maintained, otherwise the bonding effect will also be affected.

2. The edges are stained or excessively adhered to glue

1) Excessive glue;

2) Mechanical failure in the trimming procedure;

3) Improper glue application position;

4) The set temperature of the fuser is too high;

3. Insufficient or uneven gluing of the gluing machine

1) The glue spreader has blocked glue during the pre-melting process or at the glue outlet, which may cause uneven glue application;

2) The operating load capacity of the machine is not enough to melt the adhesive completely;

3) The temperature setting of the fuser is too low;

4. When the trimming procedure is carried out, the edge banding is easy to fall off

1) The glue is too thin;

2) The material is too cold or damp (especially when it has just been glued);

3) If the glue line is clearly visible and shows the pattern of the glue roller, the temperature of the glue roller may be too low;

4) The conveyor belt speed is too slow;

5) The ambient temperature or material temperature is too low (working below 15°);

6) Insufficient pressure;

5. The bonding position of the initial part of the edge banding is not ideal

1) The roller pressure roller needs to master the skills to make adjustments, and extend the position to increase the roller pressure.

2) The effect is often unsatisfactory at the beginning or end of the 5cm position of the rubber surface of the rubber roller glued to the panel. This is because the rubber roller is prone to insufficient pressure at the head and tail positions. When in high-speed production, the rubber roller and the panel are prone to jump.

6. The effect of bonding the two sides is good on one side and bad on the other side

1) Poor contact between the panel (base material) and the pressure roller;

2) The uneven application of glue causes the glue to ooze out, which hinders the edge banding process.

7. Intermittent bad adhesion

1) The liquid state temperature of the hot melt adhesive is too low;

2) When the adjustment speed of the edge banding machine is too fast and the amount of glue applied is too high, the hot melt cylinder fails to melt the hot melt glue in time, resulting in uneven glue application;

3) The temperature of the fuser is unstable.

8. The edge banding appears to be detached soon after bonding

1) The temperature of the hot melt adhesive, edge banding, substrate, or pressure roller is too high;

2) The temperature (room temperature) of the construction environment is too high;

3) Excessive amount of glue;

4) The humidity of the edge banding strip or the base material is too high;

5) The base material and the edge bands themselves contain resin (oily) ingredients, so the adhesive force is reduced, which most often occurs in the process of using veneer/solid wood to seal the edges.