Tips on board materials: these words you must know!

Welcome to Zhoubao Classroom, where we'll share interesting and practical knowledge about wood panels. Today is the third lecture, and we'll discuss the technical terms of wood panels. Come learn with Zhoubao!

Screw holding force

Screw-holding force refers to the friction between the board and the nail. When a nail is driven into the board, the board fibers surrounding the nail are squeezed. Because the board is elastic, these squeezed fibers exert pressure on the nail, resisting its removal. The magnitude of screw-holding force depends on factors such as the board's density, elasticity, moisture content, and grain direction. Strong screw-holding force is primarily reflected in the ability of the nail to securely hold the board securely, preventing it from loosening, allowing for the reuse of any missing nail holes, and ensuring the board retains the nail. Boards with good screw-holding force are generally both hard and dense.

Static bending strength and elastic modulus

Static flexural strength and elastic modulus determine the ratio of the bending moment to the flexural modulus of a board under maximum load. They are crucial properties in determining whether furniture will break during use. The static flexural strength values ​​commonly seen on board products are the compressive strength the board can withstand at the point of fracture, expressed in MPa. The board's static flexural strength and elastic modulus are influenced by factors such as the raw materials and processing techniques.

Internal bonding strength

Internal bond strength refers to a board's ability to resist damage when subjected to a tensile force perpendicular to its surface. Previously known as "plane tensile strength," it is a key quality indicator for measuring the strength of the bond between the board's raw materials and the quality of the bond between the fibers within the board. Internal bond strength depends primarily on factors such as board density, adhesive dosage, and thickness. Increasing the core density of the board strengthens the internal bond strength. Increasing the adhesive dosage proportionally increases the area of ​​the board covered by the adhesive, strengthening the bonding between the fibers and significantly increasing the internal bond strength. However, internal bond strength decreases with increasing board thickness.

Moisture content

Moisture content refers to the ratio of the mass of water contained in a material to its absolute dry mass. Excessively high or low moisture content can cause deformation or even cracking of the board. Factors contributing to excessive or low moisture content include the hot pressing time and temperature during the production process, post-pressing exhaust, and the moisture content of the raw materials. Furthermore, the edge banding process after cutting can also be a factor. When purchasing cabinets, it's recommended to pay attention to the smoothness of the edge banding, any excess glue, or any signs of peeling.

Bonding strength

Bond strength refers to the degree of adhesion between the individual sheets, typically expressed as tensile shear strength. Unsatisfactory bond strength can result in delamination, peeling, and other issues. This can be caused by a variety of factors, including excessive moisture content in the sheets, poor sheet quality, different sheet materials, insufficient or uneven glue application, poor quality glue during mixing, low hot pressing temperature, short pressing time, insufficient pressure or an improper depressurization process, gaps in the glue application, and contamination and debris in the sheets.

Dip stripping

The immersion peeling performance of a wood-based panel reflects its ability to withstand the stress of the adhesive layer caused by wet expansion and dry shrinkage, thereby resisting deformation and peeling. It is also an indicator for evaluating the bonding performance of each adhesive layer in the product. If the panel accidentally comes into contact with water during use in the kitchen or bathroom, poor immersion peeling performance may cause the panel to debond and deform.

Ding-a-ling, get out of class is over. That's all for today's class. Do you have any understanding of the technical terms for planks? I hope this will be helpful when you're shopping for planks.