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Plywood is made from gluing several sheets of wood (called Veneer) on top of each other, to create a SANDWICH, which is then placed inside a mold and under pressure to dry. Veneer hardness, veneer thickness, number of veneer layers, direction of grain in each layer of veneer, and the positioning of T-Nuts are all important design considerations which affect the structural strength needed in a finished piece of plywood.
High Frequency is used to create Friction, which creates Heat, which is used to Dry the veneer-sandwich’s moisture. If several sheets of Veneer should be laid on top of each other, with the Grain in each sheet facing in the same direction, the result will be a Sandwich that will be very strong in the direction of the Grain, and very weak in the direction opposite to the grain. To make a strong Sandwich, each sheet of Veneer in the Sandwich must be laid with the Grain in Alternating Direction from One Veneer to the next Veneer.
A sheet of Veneer that is smaller than the intended surface area, of the Sandwich, will create a weak area in the plywood. Using Veneer scraps, or small pieces of Veneer to cover the surface, will also cause weakness in the structure of Veneer, as well as the possibility of Veneers not Bonding in between the gaps.


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In this system, molds are made with sheets of metal welded together, leaving a hollow space inside the top and bottom halves of the mold. In this system, molds are made with solid plywood, with a sheet of aluminum covering the surface of each half of the mold.
Veneer is hard to bend in the direction of the Grain, and easy to bend in the direction opposite to the Grain. If the Press is opened before the Sandwich is completely dry, the veneers will separate from each other and will not Bond.
In order for the plywood to form, bend, and take the shape of the mold, the layers of veneer must contain a certain amount of moisture, which together with the moisture present in the adhesive itself, must be dried perfectly well in order for the shaped plywood to maintain its curves and shape once taken out of the mold.


The hollow space inside each half of the mold allows for hot steam to travel in and out, creating heat that will help to dry the moisture within the veneer sandwich.The advantage of this system is that it is a much cheaper manufacturing process. Each of the two aluminum sheets is connected to the Positive or the Negative poles of a High Frequency Generator, which converts electricity to High Frequency waves.
The HF Waves travel from the top half of the mold, through the veneer-sandwich, and all the way to the bottom half of the mold for as long as there is moisture within the veneer-sandwich (since moisture is a conductor of electricity).The advantage of this system is that HF waves will continue to travel THROUGH the veneer-sandwich until it is 100% dry. As a result, this is a preferred method with almost ALL plywood manufacturers in Asia.The drawback with this method is that the heat is applied to the veneer-sandwich from the Top and the Bottom, trapping moisture within a veneer-sandwich towards its center core.




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