Quality Control Inspection and Assurance

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Moisture content (%) Glue shear strength (in dry state) Adhesion of ply Glue shear strength(after 72 hrs. boiling) Tensile StrengthAlong the grainAcross the grain Sum strength Static bending strengthModulus of ruptureAlong the grainModulus of elasticityAlong the grainAcross the grain End Immersion Test Glue Adhesion Test Knife Test Impact Inclination Test Water resistant test Mycological test Modulus of elasticity Modulus of …

 Poor physical performance The hot pressing temperature is low or the hot pressing time is short, the resin curing is incomplete, and the surface of the melamine paper is easy to stick dust during use, which is difficult to clean and forms a dirty surface. The hot pressing temperature is too high, the hot pressing plates surface temperature is uneven or the …

Causes and Prevention Measures of Plywood Bubbling in China In the plywood production process, hot pressing is a very important process, which is an important process to finalize the product. It is irreversible. Once quality problems occur, especially bubble will bring great losses to the company. Therefore, it is necessary to understand and master the causes and prevention methods of …

Defects easily occurred during hot pressing of plywood in China and solutions 1、 Bubbling and partial delamination Causes: 1. The moisture content of veneer is too high or the drying is uneven 2. Too much glue 3. The pressure drop speed is too fast or the hot pressing temperature is too high 4. Insufficient resin condensation 5. Insufficient hot pressing …

Bubbling, delamination , warping, common problems of plywood hot pressing in China 1、 Bubbling and partial delamination Causes: 1. The moisture content of veneer is too high or the drying is uneven 2. Too much glue 3. The pressure drop speed is too fast or the hot pressing temperature is too high 4. Insufficient resin condensation 5. Insufficient hot pressing …

How to solve the problem of low bonding strength of plywood in China Plywood is a kind of building board that is often used by people. This kind of board is not cut from a large piece of wood, but is glued together by using adhesives. With the progress of technology and the strict requirements of plywood manufacturers, the service …

Quality problems and solutions in plywood production in China In the production process of any kind of product, there will be some quality problems. There are many and complex factors that affect the product quality, including the quality of raw materials, the insufficient precision of processing equipment, or the unreasonable processing technology arrangement. Of course, the other important reason is …

Defects of Chinese Plywood and Their Causes: Structural Defects and Appearance Defects Glue strength defect Low bonding strength The bonding strength of plywood is lower than the specified value of the standard. The reason is that the quality of adhesive is poor; The hot pressing conditions are not well controlled, such as low hot pressing temperature, insufficient pressure or short …

Analysis and Control of Common Quality Defects of Plywood in China At present, China is a big plywood exporter and the largest plywood producer in the world. However, on the one hand, China’s plywood products are frequently squeezed by foreign trade barriers, on the other hand, they are impacted by international advanced productive forces, facing huge challenges and threats from …