Home > News > Content
The Influence Of Heat Pressure On The Quality Of Plywood
Oct 13, 2017

The influence of heat pressure on the quality of Plywood

The Plywood is formed by the compression of multiple single layer Plywood and the pressure of the hot press has an important influence on the quality of the Plywood. The temperature is too low for the Plywood to have a larger effect, so we need to control the appropriate temperature.

The thermal pressure temperature is too low, which is not only bad for the melting of Plywood hot melt adhesive, but also causes the adhesives to be too low and even degelatinized, thus the strength of the Plywood decreases. It can also delay the evaporation of water in the veneer of Plywood and reduce the production efficiency.

Hot pressure temperature is too high, too high temperature, hot melt adhesive will be and dissolve, it is coated rubber layer thinned. Those wood sex is inferior plank, also meeting with temperature rise a few deformation, reduce the hardness and strength of plank itself. Therefore, in the actual hot pressing process of Plywood, the suitable temperature range should be determined according to the tree species, wood characteristics and the types of hot melt adhesive.

Reasonable control hot-pressing temperature can control the slab moisture evaporation, reduce the lumber moisture content, can control the moisture content of veneer in 8 ~ 12% range, optimum moisture content, reduce the incidence of bubbling and partial debonding. Reasonable control of hot pressure temperature can also increase the plastic of the wood and promote the wood compaction.

Plywood is one of the furniture made of material, adopting is multilayer wood square or two sub-companies named seaport with adhesive glue, now in the process of production of Plywood can adopt three step-down process, what is the advantage of this process? So let's see.

Three sections of depressurization process refers to after preloading and hot-pressing process, before after the group of billet hot pressing, preloading was carried out on the slab at room temperature, make its adhesive materials into a whole, can prevent the slab in the hot press plate produced when displacement caused by core stack, away from the seam defects such as; After about by hot-pressing temperature is 140 oc, unit pressure of 2.5-3.0 MPa hot-pressing bonding process, again to be in order to prevent the phenomenon of "bubble" in three sections of decompression process, the first paragraph by the pressure of work to "balance pressure", the second paragraph by the equilibrium pressure to zero, the third paragraph from zero to the complete opening hot platen.

Plywood is one of the most commonly used materials for furniture. It improves the utilization rate of wood and is an important way to save wood. The quality of adhesives in Plywood is determined by the adhesive strength. The quality of the Plywood can be guaranteed only with sufficient bonding strength.

Plywood has now become one of the board that you most like to use, because the Plywood is made up of three layers or more than three layers of veneer with each other vertically, and agglutination of plate according to the symmetry principle, it is easy to confuse it with multiplayer solid wood floor. In fact, they are different from material or processing. Now let's differentiate between these two plates.

Plywood is generally divided into four levels: first, second, third, thereof, the first-class and second-class product is mainly used for high-end building decoration, high-end furniture, Musical Instruments and appliances shell, its high requirements for material and machining accuracy; The third grade and the equal foreign products are the common Plywood for low grade building decoration and packaging materials, which have low demand and low price.