How long will it take for the puzzle to unravel?

It is necessary to measure the working environment temperature and wood surface temperature in time in different seasons. To some extent, the temperature determines the speed of glue crosslinking. For example, if the temperature is low in winter, the glue dries slowly and the penetration is shallow, it is necessary to extend the pressing time of the puzzle, otherwise it will easily lead to cracking. In addition, the service life of glue is different at different temperatures. Usually, the temperature is 25℃, and the active period of glue is 45-60 minutes. When the temperature is higher than 35℃, the active period of glue will be greatly shortened. Generally, the glue used for glue mixing and splicing is two-component, and the master often does not strictly follow the standards when mixing glue, resulting in different product quality grades. In fact, rubber mixing is a big problem worthy of attention by experts. The optimum ratio of main agent and curing agent is 100: 15. When mixing glue, you can't mix impurities such as sawdust and dust, and you can't add water. After mixing, you should mix well. In addition, the prepared glue should be used up during the activity, and sealed after taking the glue, so as not to affect the secondary access. The moisture content of wood will also affect the use effect of plywood adhesive. Generally, the moisture content of dry wood after natural moisture regain should be controlled within 7- 12%. When the moisture content of wood is lower than 7%, it may be due to the excessive permeability of wood, resulting in the lack of glue on the bonding surface and cracking. The high moisture content of wood will directly lead to poor air permeability and weak splicing. In addition, the critical moisture content difference of wood should be controlled within 3%. It is better to produce cracks, which will lead to the cracking of the puzzle. The splicing of wood processing accuracy has strict requirements for wood, and the bonding surface of wood should be flat, smooth, free from oil stains and bending, without the phenomena of "planing, sawing and carbonization", and the processing error of bonding surface should not be greater than 0.5mm (the pressure should be kept uniform); Adjacent sides of wood are at right angles; In addition, in order to keep the glued surface of wood fresh, the active genes on the surface of wood can only be maintained for a period of time, so it is generally necessary to split the wood as much as possible.