How to specialise your production with unwinders and rewinders

Winding technology, in the form of unwinding and rewinding systems, plays a vital role in modern production facilities. These systems are essential for the processing of web materials.

Krögel offers a comprehensive range of such systems, specially designed for integration into a wide variety of production environments. When developing our machines, we focus on the individual requirements of our customers. Our portfolio includes numerous unwind and rewind systems that have been successfully integrated into existing production lines. These systems are an integral part of various industries.

Basic functions of unwinding and rewinding systems

Unwinding and rewinding systems play a crucial role at the beginning and end of a production line. Safe and accurate unwinding and rewinding is critical for material guidance for further processing in downstream processes, transport and storage. We offer a range of winding technologies to meet all your requirements.

Contact winders or support roll or surface winders use two support rolls to wind material without special surface requirements. This type of winder is mainly used to wind large and heavy rolls of material onto small core diameters. The entire weight of heavy rolls of material rests on two driven support rolls to prevent deflection. Tight winding is achieved by minimally varying the winding speeds of the carrier rolls in relation to each other. Depending on this adjustable differential speed, the winding hardness can be set by the control system. Depending on the application, support rollers, tension rollers and side guides can improve winding results and handling. The use of a fabric accumulator (compensator) after and before the winding process can be realised. Automatic roll change can also be implemented. Depending on the customer’s requirements and the material properties, a wide range of carrier roll surfaces (rubberised, etc.) can be considered. With this type of winder, the speed of the material winder remains constant throughout the winding process.

Centre winders are specially designed for gentle handling of sensible materials. The material is picked up directly in the centre. Depending on the sensitivity of the material, centre winders can be used with a controlled drive in terms of torque or speed. Depending on the customer’s application, centre winders can be designed as a mobile system or as a fixed installation. Centring bearings can be supplied on both sides or self-supporting for a wide range of core diameters. Using a pre-installed web tension control system, the desired winding hardness can be specified and regulated. Alternatively, pneumatically or hydraulically adjustable pressure rollers are used to achieve the desired winding characteristics. To ensure a continuously running production process between the winding stations, a accumulation system (compensator) is necessary before and after each winding process. If required, a centre winder can be combined with a contact winder. With this type of winder, the speed of the material winder varies throughout the winding process.

Customised applications of a unwinding and rewinding system

The requirements for unwinding and rewinding systems vary greatly depending on the industry and application. In the textile coating industry, for example, the quality of the coating and the material characteristics are of paramount importance. Our unwinder and rewinders precisely control web tension and speed to meet these requirements. The focus is on avoiding wrinkles and edge controlled material run to ensure a uniform and homogeneous coating over the entire material width.

When processing nonwovens, it is sometimes necessary to handle the loose structure of the material gently so as not to destroy it. Our customised winding technology takes into account the specific properties of this type of material. Our winding systems can be customised and designed for specific material properties to achieve the optimum winding experience and the highest possible product quality.

The technology behind our winding systems is not only precision engineered, but also robustly constructed to withstand extreme production conditions. Our unwinder and rewinders are specifically designed to withstand continuous stress and deliver the desired winding results. Our winders can handle a wide range of material thicknesses and widths. They can be configured for continuous or discontinuous processes to maximise efficiency and throughput.

Unwinding and rewinding systems are also critical in effectively preparing rolls of material for further processing. Contact and centre winders are particularly important, depending on the surface requirements and sensitivity of the material. Our systems also offer precise edge control options to accurately guide the material flow and maximise product quality.

Importance of unwinding and rewinding systems

In the specialised production of web materials, winding and unwinding and rewinding systems form the core of the production infrastructure. They are indispensable for a wide range of applications. Whether it is high-precision textile coating, efficient processing of floor coverings, non-wovens, technical textiles and films or insulation materials.

An unwinding and rewinding system plays a key role in preparing rolls of web material for downstream processing. There are different systems: contact winders use support rolls, which are particularly suitable for materials where surface quality is of secondary importance. Centre winders drive the centre of the core directly, making them ideal for materials that are sensitive to tension and pressure. Where precise wind edges are required, an edge control system is used to accurately guide the material to a downstream process.

Our systems are critical to the quality and efficiency of material production. Unwinding and rewinding systems from Krögel Maschinenbau are synonymous with the reliability and precision required for the increased production our customers demand.

Product features and customisation

Krögel Maschinenbau does not produce “off the shelf” systems. Each unwinding and rewinding system is individually developed according to the specific requirements and needs of our customers. Our winders are characterised by high reliability and precise web tension control, which is essential when processing delicate and sensitive materials. The centric bearing for the winders can be offered on both sides or cantilevered for a wide range of core diameters. Depending on the customer’s application, unwinders and rewinders can be designed as mobile systems or fixed installations. The winding process can be motorised or simply mechanically or pneumatically braked, depending on the material properties and application situation.

The flexibility of our systems makes it possible to work with a wide range of web materials. They can be seamlessly integrated into existing production lines and retrofitted if required. We also offer accessories such as edge guide systems and various braking systems to prevent uncontrolled material winding. Our customers appreciate the direct contact with our company. Together we configure and develop a tailor-made system that not only meets the requirements, but also takes production to a new, higher level.

Technical specifications and customisation options

The unwinders and rewinders from Krögel Maschinenbau are characterised by their wide range of technical specifications and optional features. As a result, our unwinders and rewinders cover the majority of industrial and customer-specific requirements. A wide range of working widths can be achieved, from less than one metre to several metres. In addition, a wide range of materials and weights can be handled, adding to the versatility of these systems.

Sector-specific applications and case studies

Our unwinding and unwinding systems are used in a wide range of industries. In the textile industry, they support the precise handling of fabric webs. In the packaging industry, they handle film and paper. In the automotive industry, they enable precise handling of composite materials.

Winding types

  • A-frame winders

  • Centre winders
  • Support roll winders

  • Contact winders

  • Turret winders

  • Edge strip winders

Centre winders

Examples of 100% custom-made systems

A-frame winders

Examples of 100% custom-made systems

Support roll winders

Examples of 100% custom-made systems

Turret winders

Examples of 100% custom-made systems

Contact winders

Examples of 100% custom-made systems

Technical features and advantages

Our unwinders and rewinders offer flexibility and functionality to meet your needs. If required, they can be easily integrated into existing production lines. These features are essential for continuous and sustainable improvements in productivity and efficiency. Both types of winding technology provide optimum solutions for handling a wide range of material types. Our rewinders and unwinders are designed to meet specific requirements and applications. This ensures maximum performance at all times.

Operating widths up to 5,800 mm
Machine speed up to 100 m/min
Winding diameter up to 2,000 mm
Winding type Centre winder, contact winder
Customisation with and without cutting systems
Changing finished rolls continuous / discontinuous
Removal of finished rolls with and without winding shaft handling
Handling of finished rolls with and without packing device
Processing of wide range of materials and surface weights

Contact us now with a no-obligation enquiry for our unwinding and rewinding systems.

Krögel Maschinenbau stands for innovation and quality in the development of unwinding and rewinding systems. Thanks to our customised solutions and wide range of technical specifications, our systems meet the requirements of a wide variety of industries. We invite you to explore the possibilities of cooperation and to contact us. Discover how our systems can optimise your production processes and increase your productivity.