China plywood manufacturing : trimming first or hot pressing first?

观察了很多的中国的胶合板工厂,发现一些共同的缺陷,成品的表面加工缺陷特多,尤其是外来垃圾在热压工序的时候造成的凹陷痕迹。

Observed a lot of China’s plywood factory, found some common defects, the finished product surface defects, especially foreign garbage in the hot pressing process caused the depression traces.

那么,经过多年的板材加工和质量控制经验以及现场研究,发现他们是贴了面皮之后并不是先锯边,而是先热压再锯边,所有在使板材上热压机的时候,边部的垃圾进入了热压钢板里,所以造成了垃圾压痕。

So, after years of experience in wood-based panels processing and quality control and on-site research and found that   after the wood face veneer lamination they did not use the saw blade to trim the edges of the plywood , but   first did the hot pressing and then triim the plywood edge,when put the plywood to the hot pressing plates ,  the garbage were forced go into the hot-pressed steel plate, resulting in garbage indentation.

 

其实这个现象,在六七年前在很多的工厂已经开始了先锯边再热压,就是防止垃圾压痕,当然是指一些硬杂木面的胶合板,容易造成压痕。

如果是软杂木问题就不是很大。

In fact, this phenomenon   six or seven years ago in many factories have begun the first use saw blade to trim the plywood edges and then make the hot pressure, just to prevent garbage indentation, of course, refers to some hardwood faced  plywood, easily lead to indentation.If it is softwood faced plywood the  problem is not big issue.

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