Hydraulic Shaftless Unwind Stands

In the roll-to-roll processing industry, some ultra-large jumbo rolls feature wider widths or extended lengths exceeding 10,000 meters. These characteristics significantly increase their weight and value. If the maximum weight exceeds the capacity of the traditional unwinder stand, it can lead to breakage or create challenges during loading.

To address this critical issue, we have developed hydraulic shaftless unwind stands specifically designed for jumbo rolls weighing between 1 to 2 tons. This solution ensures efficient handling and reliable operation for heavy-duty applications.

Our hydraulic shaftless unwind stands are available in widths ranging from 1200mm（47-inch） to 2800mm(110-inch), making them ideal for lifting thermal paper jumbo rolls and heavy-duty continuous fiberglass-reinforced thermoplastic (CFRT) unidirectional tapes. Compared to pneumatic unwinder stands, the use of hydraulic force enhances durability and performance.

Each shaftless unwinder stand is equipped with a remote control, allowing for effortless position adjustment and improved operational convenience.

The unwinder stand plays a crucial role in the slitter rewinder, ensuring continuous and stable operation for every client. To enhance its stability and reliability, we have made a significant improvement by replacing the traditional ball screw mechanism with a modern linear guideway.

In 2020, we utilized ball screws and asynchronous motor force to control the left/right position of the unwinder stand. From 2020 to 2023, we implemented ball screw-type unwinder stands in slitter rewinders. However, some clients reported that the weight of their jumbo rolls was too heavy, leading to ball screw failures.

Upon receiving this feedback, we promptly addressed the issue by implementing design changes to improve durability and accommodate heavier loads.

To ensure the long-term durability of the linear guideways, we have equipped the machinery with protective way covers to prevent dust ingress. For optimal performance, we recommend applying machinery lubrication oil monthly to maintain smooth sliding and reduce wear.

The stand clutch on our unwinder stand is 3 inches, conforming to the international standard for paper cores. If you are using larger diameters, please inform us. We also offer a 6-inch clutch and shaft sleeves to address paper tube compatibility requirements.

In addition to our compact shaftless unwinder stands, we also offer large-scale models designed for drum slitter rewinder machines. These drum slitter rewinders are typically used in paper mills for mass production. It’s important to note that the large-scale unwinder stand requires a foundation to be excavated and installed below ground level for proper stability and operation.

The unwinder stand requires a foundation for installation primarily to ensure stability and safety during operation, especially for large or heavy-duty unwinder stands, such as those used with drum slitter rewinders. Here are the specific reasons:

1. Load-Bearing Capacity

Large unwinder stands are often required to support heavy jumbo rolls, such as those used in paper mills. These rolls can weigh several tons. Without a proper foundation, the stand may tilt, vibrate, or even collapse under such heavy loads. A foundation enhances the load-bearing capacity of the equipment.

2. Vibration and Movement Prevention

Under high-speed operation or heavy loads, the unwinder stand may generate vibrations. If placed directly on the ground, these vibrations can affect the precision of operation and may cause the equipment to shift. A solid foundation absorbs vibrations effectively and keeps the equipment securely in place, ensuring stable operation.

3. Improved Precision

The stability of the unwinder stand directly impacts the precision of slitting and rewinding. A well-constructed foundation ensures the equipment remains balanced and level, which improves unwinding and slitting accuracy and reduces waste.

4. Extended Equipment Lifespan

A stable operating environment reduces wear and tear on mechanical components. A foundation minimizes additional stresses caused by instability, thereby extending the service life of the equipment.

5. Safety Considerations

A foundation ensures the equipment operates safely under heavy loads and during long-term use, preventing accidents, especially in industrial settings where the rolls are massive, and operations are frequent.

For these reasons, building a foundation is a critical step in the design and installation of heavy-duty unwinder stands, ensuring long-term stability, efficiency, and safety.

Hydraulic shaftless unwinder stands are the ideal solution for jumbo roll converting. If your company is looking to replace traditional unwinder stands, please feel free to contact our sales team for more information.