The main causes of end cracking after splicing with splicing adhesive during storage are as follows:
1. The substrate has too much moisture or uneven moisture content.
2. The proportion of curing agent is too low or unevenly mixed.
3. The precision of the base material is not high.
4. The substrate is flexible.
5. The clamp is too far from the end of the material.

When using water-based adhesive for splicing, the moisture content of the material must be reasonably controlled. For most substrates, the moisture content difference between the same type of wood should be within 2% during bonding. If the moisture content is too high or uneven before splicing, the amount of adhesive penetration will be low, and the ends will lose moisture quickly during drying, causing the wood to crack.

A proper curing agent ratio is used in the splicing adhesive process to improve film strength and water resistance, and to accelerate the curing reaction rate during operation. If the adhesive strength is low, water resistance is poor, and the drying and curing time will also be extended.

There are many factors affecting splicing quality, such as uneven ends, uneven splicing, reverse grain planing, etc. It is required to achieve glue-free splicing without light.

When the moisture content of some wood changes, its shape will change significantly. After wood absorbs water, it can also cause shape changes. For example, during operation, the film strength of the splicing adhesive may be insufficient.

If the pressing tool is too far from the end, the pressure at the end position is low, resulting in low strength and easy cracking. It is reasonable when the pressure is within 3 inches of the end.