Rope threading system is used for rewinding and longitudinal slitting of the paper web from the paper machine reel spool into paper rolls of required sizes.

Design

The winding part of the machine consists of two rolls, each of these carrying rolls has its separate drive. A hydraulically controlled ejector of the reeled up rolls and hydraulically controlled cross cutter, which separates the paper web from the wound up roll, are installed in the first carrying roll bedding in the paper web run direction. The carrying roll guard bedding is done in the same way on the second roll, it is controlled pneumatically and serves for a safer roll manipulation in the area between the tilting table and the smooth carrier roll.

Both rolls are dynamically balanced according to the required winding speed. Surfaces of both rolls are plasma-sprayed. Both carrying rolls are driven by AC variable-speed motors. The paper roll is laterally guided by mandrels that are pneumatically lifted or dropped down. They are retractable hydraulically or pneumatically. Every paper roll, while being reeled up, is pressed down from the top by a rider roll, its loading is controlled according to diameters of the paper roll while being reeled up. Pressure roll guiding is equiped by the system
against the roll crash.

The slitting section of the machine is arranged according to required width of strips to be cut, max. operating speed and type and width of the paper web. It is controlled pneumatically or electro-pneumatically on principles of so-called shears slitting with a tangential slit or a slit with embracement on the slitting roll. The machine is equipped in front of and also behind the slitting section with spreader rolls used for correct paper web guiding and cross stretching in the input part just before cutting and when coming to carrying rolls.

These spreader rolls are installed on feeders for an optimal adjustment of the paper web run. The slitting section comprises also a device for direct measuring of the paper web tension located on the guide roll with its constant embracement by means of which the required tension of the reel can be controlled. In the slitting section, there is also an equipment for a dust exhaustion which significantly reduces the amount of impurities on the paper surface.

The paper web threading system serves for a transfer of the paper web from an unwinding stand through transfer, spreader and guide rolls, the slitting section and its spreader roll up to the space between carrying rolls of the rewinder. It comprises V-belt conveyers, chutes, air nozzles, clamping roll device and underpressure system with a sucking of the paper web onto the first carrying roll of the rewinder.

The unwinding stand is arranged as a twin frame with two stands on which reel spool beddings with locking levers and an ejector of empty reels spool, combined with hydraulic dampers on ends of unloading arms, are installed. The brake for unwinding is manufactured either with an AC generator motor, a pneumatic disc brake with air or water cooling, or a drum brake. A clutch installed between the brake and the reel spool is equipped with a grooved shaft on which the coupling part is pneumatically displaced in dependence on the reel spool carrier. The entire unwinding stand is equipped with a cross and longitudinal feed for correct adjustment of the paper web run when entering the machine.

The machine can be also delivered with a complete electric installation, including the control system, automatic paper web threading system, equipment for dust exhaustion from the paper web surface, equipment for suction of trimmings in the slitting section, and reel spools. Besides production of new machines, the company offers also complete overhauls and reconstructions of rewinders and their parts. Machine design and work safety are in compliance with EU and EAC standards.

Main parts

• Bearing structure – individual stands made of profile steel, attached to each other by fixing bolts and locks (1)
• Supporting rolls (2), pressure roll (3)
• Core clamping mandrels
• Paper rolls ejector (5), tilting table (6)
• Spreader rolls (7)
• Slitting section (8), paper web threading (9)
• Unwinding stand (10)
• Machine hydrostatic drive
• Machine pneumatic circuit
• Machine electric part (switchboard boxes, cabling, control board)
• Control system incl. software
• Machine guards, machine drive (11)

Accessories

• Equipment for suction of trimmings
• Automatics for paper web threading
• Equipment for dust exhaustion
• Reel spools with rubber or polyurethane cover
• Automatic roll core threading
• Cross knife
• Vacuum on a grooved carrying roll
• Barrier increasing safety of reel spools handling on unwinding stand
• Central lubrication system

Scope of delivery

• Machine according to main parts description
• Accessories optionally

Material

• Bearing structure – common steel
• Roll coats – common steel with a surface treatment