What is plywood cold press?

Before hot press, the board should enter the cold press machine for a short time at normal temperature to bond the veneers together by the initial viscosity of the glue, this process is also called pre-pressing.

In this process, no pad is required for loading and unloading.

Plywood Cold press time :

The pre-pressing time of urea-formaldehyde glue is 40-200 minutes, while it should be 20-120 minutes for Phenolic glue.

What’s the difference of Urea-formaldehyde glue(MR Glue) between plywood cold press glue and plywood hot press glue?

1. In cold press,polyvinyl alcohol is required in Urea-formaldehyde glue to improve the initial viscosity and shorten the cold-pressing time

2. The curing agent (such as ammonium chloride) also required to speed up the curing speed and improve the cold-pressing effect.

Plywood Cold-pressed time varied with different type glue

1. Phenolic glue has a shorter cold-pressing time than urea-formaldehyde glue: phenolic glue has high viscosity and poor fluidity during cold pressing, and can achieve the required bonding strength faster

2. Environmentally friendly glue has a longer cold-pressing time than urea-formaldehyde glue: formaldehyde can enhance the adhesion and durability of glue, and the formaldehyde content in environmentally friendly glue is low.