NEWS DETAIL
You can learn more about our company's lastest news and events in there.
You are here: Home » News » Company News » Plywood production the lay up link

Plywood production the lay up link

Views:2     Author:Site Editor     Publish Time: 2019-08-14      Origin:Site

Despite huge advances in computer technology and automation, plywood panels are still essentially compiled by hand. This is because of the large variation seen in the form and colour of veneers; they are not flat, not particularly flexible and are often split. These factors make it difficult for an automated system to cope with veneer. Humans can recognize veneer defects and can modify the layup accordingly. So human resources are largely required by plywood making industry.

微信图片_20190626093810

The most common method of applying adhesive is with a double side glue spreading machine which applies a known amount of adhesive to both faces. Adhesive is applied to both faces of alternate veneers and not every veneer. For example, in a 3-ply panel adhesive is only applied to the middle veneer and for a 5-ply only to veneers 2 and 4. Other adhesive application systems for plywood making are used including: curtain coating, spraying and extrusion.

The grammage of adhesive applied varies with grade of panel, type of adhesive, wood species and, in particular, the surface smoothness of the veneer. Less adhesive is necessary for smooth faced veneers. A typical grammage will range from 140 to 240 g/m² per face (or glueline). It is sometimes quoted as a double face measure (and so double the figures given in the previous sentence) because the roller spreaders apply adhesive to both faces at once.

微信图片_201906241641416

When laying-up plywood, the veneers placed on the outer faces should be the orientated so that their tight faces are exposed. If this is not done, then there is a risk of excessive checking on the surface with time as the veneer moves with changing atmospheric conditions. Some mills have semi-automatic lay-up lines where surface veneers are handled by machine.


QUICK LINKS

CONTACT

  Peter
  0086-13697816816
  peter@plywood-machine.com
  Feixian Industrial Area,Linyi City,Shandong province
If you have any questions or comments, please contact us using the form below.

Copyright © 2019 Feixian Feichengzhen Changsheng Machinery Co., Ltd. All rights reserved.