How to improve the cracking, glue penetration and edge lifting of hot-pressed veneer?

Many factories that produce hot-pressed wood veneer have encountered such a problem: the wood veneer after hot-pressing either cracks, curls at the edges, or shows glue and bubbles?

I suspect that the wood veneer is not good enough, that the machine's hot pressing temperature is too high and the pressure is too great, or that too much or too thick glue has been applied! Despite thorough investigations from all aspects, the problem still cannot be solved one hundred percent.

Warping and cracking

Where is the problem?

To understand bubbling, cracking and glue penetration, we have to start with the glue used! Traditional hot-pressed veneer lamination mostly uses urea-formaldehyde glue or modified white latex glue.

Urea-formaldehyde adhesive, needs to be mixed! The glue is not environmentally friendly and is prone to seeping through. The temperature requirement for hot pressing is above 100 degrees. Under such high temperatures, the wood veneer loses water rapidly, which naturally leads to cracking.

Modified white latex adhesive has insufficient thermal strength. When pasting solid wood or multi-layer boards, it is very prone to warping and bubbling.

The insufficiency of the adhesive's performance brings more and higher requirements and details to the hot-pressing process, and naturally, more problems with wood veneer application are prone to occur.

Modified white latex

Urea-formaldehyde adhesive

Improve the solution

Improve the glue and introduce a more high-quality and targeted hot-press wood veneer adhesive: Fushen GW-6528A hot-press wood veneer adhesive.

This glue is a zero-formaldehyde single-component adhesive. When the hot pressing temperature is generally between 80 and 90 degrees, it only takes 2 to 3 minutes. Its thermal strength is extremely high. Wood veneer is not prone to cracking and does not bubble. Even smoked wood veneer, dyed wood veneer, or relatively thick and hard wood veneer with high difficulty will not crack.

Moreover, it can also neutralize the tannic acid in red oak, white oak or cherry wood veneer, significantly reducing the occurrence of bluing in these wood veneers. Because it also has unique repairability, its effect will not be affected when the extended and enlarged board is pasted or when it is subjected to secondary hot pressing.

Fushen Woodworking Adhesive is a brand of woodworking adhesives under Guangdong Fushen Chemical Co., LTD. It covers water-based environmentally friendly single-component, high-performance wood veneer adhesives, panel gluing adhesives, assembly adhesives, pressing board adhesives, etc., integrating R&D, production and sales.

Fushen was founded in 2005 and has been dedicated to the field of woodworking adhesives for many years. It is committed to developing environmentally friendly and high-performance adhesive products to catch up with international professional standards and is hailed by the wood products industry as "China's Expert in wood veneer adhesives".