From the perspective of the principle of applying latex adhesive for wood veneer using a hot press, there are several main reasons for blistering. Other causes are not excluded in actual production.

A: Hot pressing time control.
B: Low substrate moisture content or excessively dry air.
C: Uneven substrate surface.
D: Excessively long open time after glue application.
E: Uneven glue application or insufficient glue amount.

Regarding hot pressing time, the time required for different wood adhesive products to bond veneer on different materials is not uniform. The general rule is that adhesives with high initial strength or fast surface drying require a shorter time.

When the substrate moisture content is low or the air is too dry, the adhesive loses water rapidly, causing rapid surface film formation. During hot pressing, it cannot effectively penetrate into the other material. It is necessary to adjust the substrate moisture content, air humidity, or adjust the open time of the adhesive.

When the substrate is uneven, the film thickness on the substrate surface after glue application is inconsistent. Areas with less glue film form quickly due to low moisture content and cannot form an effective bond after pressing. The substrate needs to be thickness-calibrated to make the surface smooth.

If the open time after applying the wood veneer adhesive is too long, the adhesive loses water, its viscosity increases, and during hot pressing, it cannot effectively penetrate into the other material. The open time during operation needs to be reasonably controlled.

If the wood veneer adhesive is applied unevenly or the glue amount is insufficient, areas with less glue are prone to rapid film formation and cannot evenly penetrate into the other material during hot pressing. The glue needs to be applied reasonably and evenly, controlling the glue application amount.