What is rewinder in paper machine?

A rewinder machine is a machine that is used to wind a roll of material, such as paper, film, or tape, into a smaller roll or into a specific shape. There are several types of rewinder machines, including surface winders, center winders, and coreless winders, each of which operates slightly differently.

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In general, a rewinder machine consists of a series of rollers or drums that the material is fed through, as well as a drive system that rotates the rollers or drums to wind the material onto a spindle or core. Some rewinder machines also have additional features, such as slitting or cutting systems, to cut the material into specific lengths or widths.

To operate a rewinder machine, the operator typically loads the material onto the machine and sets the desired winding parameters, such as the winding speed, the width of the material, and the size of the finished roll. The machine then winds the material onto the spindle or core, using the drive system and rollers or drums to control the tension and position of the material. Once the roll is complete, the operator can remove it from the machine and prepare it for use or storage.

Rewinder machine

Rewinder is used for rewinding and longitudinal slitting of the paper web from the paper machine reel spool into paper rolls of required sizes. The winding part of the machine consists of two rolls, each of these carrying rolls has its separate drive.

Design

Rewinder is used for rewinding and longitudinal slitting of the paper web from the paper machine reel spool into paper rolls of required sizes. 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. In the top position, the rider roll is locked.

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 (4)

• paper rolls ejector (5)

• tilting table (6)

• spreader rolls (7)

• slitting section (8)

• paper web threading (9)

• unwinding stand (10)

• machine hydrostatic drive

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• machine pneumatic circuit

• machine electric part (switchboard boxes, cabling, control board)

• control system incl. software

• machine guards 

• machine drive (11)

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 under-pressure 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.

Advantages

• good price - productivity ratio

• high quality of rewound paper rolls

• high quality slitting 

• reliability in service

Scope of delivery

• machine according to main parts description

• accessories optionally 

Material

• bearing structure - common steel 

• roll coats - common steel with a surface treatment 

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