Used Threading Machines for Sale — 1

What is Veneer Peeling and Cutting?

Veneer is made basically by peeling a log machine to produce a thin layer of wood. Machines performing this type of functioning are known as Veneer peeling machines. Rotary peeled and sliced veneers are both made by drawing sharp knives through the log cutting thin layers. Rotary peeled veneers are made by cutting in a circular motion from the outside of the log into the centre. Plane sliced veneers are cut length wise from one end of a log to the other end. These machines allow user to make peeling and cutting of veneer strips of given width simultaneously. To improve the performance and operator comfort machines are equipped with hydraulic lift, which allows to determine automatically the optimal rotational axis of the work piece and combine it with the rotational axis of centring shafts.

Types of Veneer Cutting

There are three different methods of cutting veneers sawing, slicing, half round slicing, and rotary peeling. For today peeling is the most common way to produce good quality veneers which are to undergo further processing. Rotary peeling is the most widely used method among the three different types as rotary peeling of veneers using a lathe accounts for nearly 95% of all veneer production. It is predominantly used in the manufacture of structural plywood.

Working of Veneer Peeling Machines

Rotary peeling involves centring the log or bolt onto the lathe chuck. The log is slowly rotated and the knife carriage moved into the log. The knife then converts the bolt into a cylinder. In this process of rounding, various widths and lengths of wood (fishtails) are removed from the log surface. After rounding, the bolt revolves against the knife at a speed of above 420 km/min and spindle speed up to 200 rpm have been used on large lathes. At slower speeds vibration is likely to adversely affect the quality of veneer, producing a rough and corrugated surface. The gears feed the blade towards the bolt as its diameter is reduced, so that veneer is unwinding in a continuous ribbon. During the process of peeling, lathe checks can develop in the underside of the veneer, as the underside is subjected to tension during the peeling process. The side of the veneer in which checks occur is known as the loose side, whereas the other side free of checks is known as the tight side. The setting of the knife and nose bar pressure during peeling is important in reducing the formation of checks, and also in controlling veneer thickness. Each wood species requires certain nose bar pressure to minimise the development of lathe checks, however nose bar pressures are positively related to wood density.

Used Veneer Peeling Machines

Manufacturers of veneer peeling machines are amongst others DANZER, VON BOELZIG or CREMONA. On TradeMachines you can find and choose between a big number of used machinery in different categories. Go through the different auctions, which are all offered by top itnernational auctionhouses and find the most suitable used machine for you.