Paper and Wood Products
Hydraulic tie-rod cylinders on paper machines
Hydraulic cylinders are specified as part of the automated control system for paper reel lifting, loading, supporting and positioning operations on many paper machines. Automated reeling is an essential operation in the production and finishing of paper, board and tissue. It is a continuous process that is only interrupted by reel changes when the parent reel diameter has reached a predetermined value.
Continuously increasing machine speeds are driving the trend towards larger parent reels in order to limit the total number of reel changes per day. Reelers represent the leading edge in this technology. Linear load, tension and torque can be optimised for all grades of paper and board. Typically, reelers feature between 15 and 20 specially hydraulic tie-rod cylinders to control the movements of the primary devices, lowering arms and secondary carriages. Most of the cylinders employ integrated linear transducers to provide accurate position feedback and ensure that the movement of the primary devices and secondary carriages is perfectly synchronised. The main sections of the reeler are the frame, reel spool storage and reeling drum. Reeling is carried out against the reel drum.
The primary devices receive empty reel spools from the storage area above the reel drum, lock the empty reel spool with locking clamps operated by cylinders, turn the reel spool to the tail threading and turn-up position, and deliver the reel spool to the secondary devices after turn-up.
Cylinders are controlling the secondary carriages then adjust the linear load between the reel drum and parent roll in order to reach an optimum roll structure, and deliver the full parent roll after turn-up. Turn-up devices guide the paper sheet from the parent roll around the empty reel spool and cut it during the turn-up sequence. The secondary carriage cylinders feature linear transducers that feedback information relating to the diameter of the parent roll.
Whether forestry, sawmills or furniture production – the requirements of the wood industry facing us are more demanding than in any other branch of industry. In order to overcome the competition, many factors must work together in perfect excellence. Higher material throughput, better exploitation of material, greater flexibility and lower tolerances are what the market demands. Very few providers can satisfy the expectations of machine manufacturers and users like ServoCon ALPHA does: through application expertise, innovative products and the philosophy of offering not just individual components but, above all, system solutions. These solutions include powerful components and systems, which themselves work reliably under the toughest conditions, but also techniques for achieving high productivity and maximum flexibility. ServoCon ALPHA offers the wood working and wood processing industries convincing answers to practically all questions about fluid power control technology.
Objective technical advice increases
ServoCon ALPHA sells and services hydraulic components to customers who manufacture wood and paper products using machines with controls systems from the pulp to finished products.