Rolling and wrapping of wallpaper

The existing buffer table installed after the printing line was extended with a specially designed accumulator with a maximum capacity of 325 m. The wallpaper runs through the accumulator three times to reach this content. This gives operators about 4 minutes to fix any malfunction without creasing the paper and having to stop the production line.

After the accumulator, the paper enters the tubeless double-headed winding unit. This involves 2 identically arranged winding heads built into the machine that take turns to produce a 10 m roll of wallpaper, without the paper feed slowing down or stopping. The maximum winding speed is dimensioned at 200 m/min to empty the accumulator if necessary. All parameters that determine winding quality are electrically adjustable. These include the necessary speed differences, the pneumatic back pressure of the winding head, the mechanical position of the winding shafts, etc. The continuously rotating transverse blade and the pneumatically operating counter-blade ensure a precise roll length of 10 m with a tolerance of 0 / +10 mm, regardless of the winding speed.

After the winding unit, the rolls of wallpaper are taken to the same level towards the packaging machines by means of an ascending conveyor. During the transfer on the ascending conveyor, cameras monitor both ends of the rolls. Based on the shape of the head end, the system automatically decides whether or not the roll is wound according to the requirements. The few rolls that do not meet the requirements are automatically ejected. It is possible at a later stage that the camera control system can adjust the winding unit to optimise winding quality.

Two identical protective film packaging machines are set up side by side to wrap wallpaper rolls in transparent shrink film. Conveyor belts are used to supply and remove the rolls. Both infeed and outfeed are provided with the necessary buffer positions. Before the roll is pushed through the film screen, the flap is correctly positioned and a paper label with wallpaper instructions is presented before the film screen. The paper label is applied by means of an overhead sheet feeder and a pneumatic gripper. The double design of the packaging machine ensures a continuous packaging process and, consequently, much better efficiency.

After the packaging machines, the rolls are placed one by one on the shrink wrap tunnel conveyor belt using a pneumatic gripper. At the exit point of the shrink wrap tunnel, the rolls are transferred to an elevated conveyor belt by means of an ascending conveyor. This conveyor belt transports the packed rolls to the existing machine that places them into boxes.