The moisture content of the veneer after peeling is very high, usually %60-%70. If the veneer is directly glued without drying, and then the veneer is hot pressed, when the veneer is glued, it is easy to produce due to too much moisture. Glue infiltration makes the glued surface of the veneer lack glue; during hot pressing, it is easy to produce bubbling, degumming, and glue penetration on the board surface; when the plywood is used, it is easy to produce defects such as degumming, deformation, and surface cracks. In addition, if the moisture content of the slab is too high, the hot pressing time of the hot press will be prolonged and the productivity of the hot press will be affected. Therefore, the veneer after peeling must be dried in a veneer dryer to make the veneer meet the requirements of the plywood production process
The basic principle of veneer drying？
Veneer drying is the process of drying the rotary cut wet veneer to a certain moisture content according to the process requirements.
The relationship between veneer reasons and drying speed？
1. Different tree species have different densities, so the drying speed is also different. In the case of the same thickness, if the same weight of water is evaporated, the value of the moisture content reduction of the veneer of the denser tree species is smaller; on the other hand, from the perspective of the structure, the cell cavity in the wood tissue of the denser tree species is smaller than that of the veneer. Small, the cell wall is thicker, so the resistance of water conduction in the range of low moisture content is large, so the drying speed is reduced. But some tree species are exceptions, for example: Ash veneer with a density of 0.69g/cm³ has a shorter drying time than basswood with a density of 0.63g/cm³, because the ring hole of the ash veneer is large, the material is rough, and it is easy to Evaporate moisture.
2. The moisture content of the veneer increases, and the drying time of the veneer increases with the increase of the initial moisture content of the veneer. The initial moisture content of the veneer depends on the moisture content of the log, the method of transportation and preservation of the log, and whether it is subjected to cooking and heat treatment.In order to ensure that the moisture content of the veneer is uniform at the end point after drying, the veneer should be classified according to the initial moisture content before drying, and the veneer should be dried under the corresponding drying conditions of the veneer. The difference between the wood core and sapwood of some tree species is obvious, the moisture content of the sapwood is relatively high, and the drying time should be increased.
The thickness of the veneer, the greater the thickness of the veneer, the greater the resistance to moisture conduction, so the drying speed is slower; the smaller the thickness of the veneer, the faster the drying speed, and the increase in the thickness of the veneer is not proportional to the slowing down of the drying speed. In order to ensure the uniform final moisture content of the veneer, it should be classified according to the tree species, initial moisture content and the thickness of the veneer before drying. The veneer is dried by different drying processes.
More about veneer dryer contact us: whatsapp: +8618769900191 +8915589105786 +8615805493072
How to produce Particle board? What is the production step of Making Particle board?Introduction:Particle board, also known as chipboard, is a versatile and cost-effective material widely used in the construction and furniture industries. It is made by compressing wood particles and adhesive togethe
The Ultimate Guide to Plywood Hot Press Machines: Crafting High-Quality Plywood Introduction:Plywood is a versatile and widely used material in various industries, from construction to furniture manufacturing. Behind the scenes, plywood hot press machines play a crucial role in the production proces
What is a veneer dryer?MINGHUNG Roller veneer dryer for drying original wood veneer, remove abundant humidity, in the end, the wood veneer humidity will be 5%-10%, so it is suitable for making plywood.Veneer roller dryer are suitable for big drying capacity per day, it can be different length, width
Minghung didn’t just sell machines – guided Heyi Wood rebirth! From line design to worker training, minghung transformed Heyi from a struggling workshop into an industry leader.
Shandong chenhong's annual production of 400,000 m3 FOSB officially rolled off the production line for the first time, spring and summer. On June 30, at the end of the first half of the year, Shandong chenhong Intelligent Technology Co., Ltd. received good news that its annual production of 400,000 m3 FOSB production line officially rolled off the production line for the first time! It is reported that the total investment of the project is 650 million yuan, covering an area of 212 acres, with a total construction area of about 110,000 square meters. It is expected to have an average annual sales revenue of 600 million yuan, a profit and tax of 100 million yuan, and nearly 200 new jobs. It is the first wide-width continuous flat-pressing line in Linyi and the first wide-width FOSB product continuous flat-pressing line of German Siempelkamp in China!
China Good Famous Plywood Machine Factory and ManufacturerNow in China market, you can easy find many different suppliers of plywood machines, face to so many choice, you may be hesitate how to choose it, how to ensure your choice is correct, you can buy the Good quality in a good priceIn China mark
MINGHUNG Kontrplak Sıcak Pres Türkiye'ye TeslimTürkiye büyükelçisi brifing verdi ve Türkiye ile Çin arasındaki ilişkilerden bahsetti, her iki ülkenin de yüzyıllardır süren iyi ve uzun bir dostluğu var. Ve Türkiye büyükelçisi Çin ile ilişkilerin birçok farklı alanda derinleşmesini umduklarını söyledi
Particle board (PB) vs OSB vs MDFDo you know what is the Difference of Particle board (PB) and Oriented strand board (OSB) and Medium density fiberboard (MDF) ?Follow me Oriented Strand Board (OSB)Particle board (PB)Medium density fiberboard (MDF)Particle board (PB), Oriented Strand Board (OSB) and
