What is the difference between table tennis blades?

Table Tennis baseboards can be divided into two types of wood layer structure, one type of wood structure (one layer of wood), the traditional Japanese-style square boards are made of a thicker layer of hinoki (cypress) wood; good quality hinoki (cypress) wood boards need to undergo rigorous screening and processing, must be straight, dense and uniform arrangement of the wood grain, but also need to be degreased and pressurized after a variety of processes. Therefore, the wood yield is very low, so the price is also very expensive; and most of the wooden subfloor is made of five or seven layers of wood structure of multi-layer plywood, the structure of these multi-layer plywood is generally to the longitudinal fibers of the wood layer and the transverse fibers of the wood layer bonded together with each other. However, the choice of wood species and structural design can make a big difference in the performance of the subfloor. Experienced people like to differentiate the hardness and elasticity of the soleplate by tapping the sound emitted by the soleplate, and some people will also use their fingers to hold the board on both sides, so that the handle gently hit their head to listen to the sound of **** vibration to select, identify. The layman will feel very mysterious, in fact, the reason inside is not difficult to understand. Once, our racket factory's new workers in the cutting of the base plate in the wrong direction, sawed out a few "horizontal grain" of the base plate, so that the original should be three layers of vertical and two layers of horizontal wood fiber base plate, into three layers of horizontal and two layers of vertical opposite arrangement, the result is to knock out the sound is very crisp, the tone of the base plate than the normal raise a lot of! The result was a very crisp sound and a much higher pitch than normal. The reason is that the transverse arrangement of wood fibers in the board is much shorter than the longitudinal wood fibers, and the short fibers vibrate at a higher frequency after being struck, so if the transverse arrangement of wood fibers accounts for a large proportion of the board, the tone from the strike will naturally be higher. The famous Red Shuangxi 032 soleplate from the 1970s was very popular with Chinese close-to-the-table fast attackers because the two thicker layers of liangan are arranged horizontally. The high hardness of the Yanagi wood and the large proportion of the board make this type of soleplate very suitable for fast attacking players, because close to the table attacking players like to hit the ball instantly to make the ball out of the board the time needed is shorter, or so-called "off-board speed" of the board, so as to give full play to the power of the sudden speed. Therefore, in order to pursue faster hitting speed, many straight shooters in that era also put a layer of tung on the back of the backboard with transverse fibers to increase the proportion of transverse wood fibers in the backboard.