Granite press roll for paper mill

Types of granite press roll for paper mill

The paper industry utilizes different types of granite press rolls to meet specific production requirements. Here are some common types of granite press rolls:

• Single granite press roll: Single granite press rolls are individual granite cylinders used in paper mills. They are usually located in the press section of a paper-making machine, where they press wet paper sheets between themselves and other rolls or blankets. Single granite press rolls provide a certain level of dehydration and smoothing for the paper sheets, helping to improve the quality and paper yield.
• Multi-Granit press rolls: Multi-granite press rolls consist of multiple granite cylinders, usually including two or more granite rolls. The multi-granite press roll increases the compression area and pressure while the paper passes through the rolls. Higher pressing force and compression contribute to a greater reduction of water content in the paper and enhanced density and smoothness. Additionally, multi-granit press rolls can improve production efficiency, thereby meeting higher paper production demands for paper mills.
• Granite rolls with surface treatment: Some granite rolls have surface treatments, such as knurling or grinding. These surface treatments enhance the friction and grip between the roll and the paper, thereby improving the pressing effect and the smoothness of the paper. Furthermore, surface-treated granite rolls can reduce the slippage and deviation of the paper, which helps ensure the stability and precision of the paper production process.
• Intermediary Granite press roll: Intermediate granite press rolls are usually located between other functional units in a paper machine. They can adjust the pressure and compression to make the paper sheets undergo additional pressing and dehydration processes. Besides, intermediary granite press rolls can also serve as buffer units, effectively reducing the transmission loss of the power and force required to press the paper sheets.

Specifications and maintenance of granite press roll for paper mill

Specifications

• Material composition

  The press rolls are made of granite, which is a strong and heavy natural stone. The granite gives the rolls a high level of durability. This means they can last a very long time without cracking or breaking. Their robust construction enables them to bear substantial weights and pressures over extended periods. Such tenacity permits these rolls to perform reliably and consistently for many years with minimal need for repairs.

• Granite hardness

  The hardness of the granite press roll refers to how tough and resistant to scratching or denting the granite material is. The granite used for press rolls has a very high hardness level. This extreme hardness makes the surface of the press rolls very tough and resistant to wears in a paper-making machine. Even after continuous use, the hard surface endures and maintains its shape without developing significant damages.

• Diameter and length

  The diameter and length of a granite press roll describe its size and how big it is. Press rolls can be quite large, with some having a diameter of around 2,000 millimeters or more. The length of the rolls can also be considerable, often reaching up to 4,000 millimeters. The large dimensions provide the press rolls with a very high pressing power. Their gigantic size and weight can exert immense pressure on wet paper. This heavy force squashes it effectively between the granite roll and the press felt, thereby removing excess water from the paper.

• Surface Finish

  The surface finish of the granite press roll refers to how the outside layer is done and the texture created. This includes whether the surface is smooth, rough, or has some other kind of pattern or coating. The texture of the surface has an important role to play in how water extraction from the paper is affected. Different surface finishes can be experimented with to find out which ones perform best in the paper-making process.

Maintenance

• Clean regularly

  It is important to make cleaning of the granite press rolls a part of the maintenance routine of any paper mill. Cleaning helps to remove any residual chemicals or paper fibers that may be left on the roll after the dewatering and pressing processes. A careful washing method that uses purified water should always be employed. Making use of purified water is good for the rolls as it helps to prevent any deposition of mineral content on their surfaces.

• Inspect for damages

  Regular inspection for any damage is very essential to maintaining granite press rolls. Users should check the rolls often to see if there are any cracks, chips, or other visible problems. Fast action should be taken to repair or mitigate any damages discovered during the inspection process. This helps to prevent the further escalation of damage and ensures the longevity and performance of the press rolls.

• Check alignment and balancing

  Periodic checks should be performed to ascertain the proper alignment and balanced state of the granite press rolls. Any adjustments necessary to make sure the rolls are ideally balanced and well-aligned should be done promptly. Consistent maintenance of alignment and balance improves the stability of the presses during operation. This balance enhances the functional efficiency of the machines. It also aids in protecting the rolls from excessive and uneven wear. Adequate alignment and proper balance help to extend the lifespan of the press components.

Scenarios

Granite rolls for paper mills perform different functions in various settings. Here are some of the usage scenarios of granite press rolls for paper production.

• Sectored Press for High-Volume Paper Production: Granite press rolls with GTA61L and GTC61L granites have been used in the papermaking sector. The specific rolls have been used to optimize the dewatering process in the paper-making sector. Notably, these pres rolls have been installed in the papermaking presser sections where water removal is necessary. The granit rolls work by applying pressure on the paper sheet, facilitating water extraction for efficient paper production. Hence, for enterprises with high paper production demands, GTA61L and GTC61L granit rolls are ideal options for ensuring effective dewatering and improving overall productivity.
• Shared Press for Paper Mills: GTA61, GTC61, and GAT61 granite rolls have been used in several paper production mills due to their versatility. Ideally, the shared presses have been installed in different sections of the paper production line, such as the pulp dewatering and paper drying sections. The rolls assist in water removal from the pulp, enhancing the consistency of the paper sheets. Additionally, the shared presses applying uniform pressure to the paper improve the quality and smoothness of the final product. Moreover, the shared presses have contributed to the optimization of resource utilization in the paper production process by using multiple granite rolls in a single unit.
• Single Press with Specific Capacity: In small-scale paper production companies with limited capacity, a single granite press roll fits perfectly. The presses with specific capacity are suitable for enterprises that do not handle large volumes of paper production. The single granite press roll occupies less space and utilizes resources efficiently. Additionally, it provides sufficient dewatering and pressing for the desired paper quality.
• Granite Press Roll in the Recycling Industry: The granit rolls are not used to create paper only, but also to extract pulp from recycled paper. The granit press rolls are essential in the dewatering process during paper recycling. They assist in the removal of water from recycled paper pulp, preparing it for further treatment and processing. Typical procedures include the formation of paper in the presser section. After the recycled paper is treated, it goes through the pressing area where pressure is applied by the granite rolls. Consequently, this removes a significant portion of the water from the recycled paper pulp, which is then used to manufacture new paper products.

How to Choose Granite Press Rolls for Paper Mills

When choosing granite rolls for paper mills, several factors need to be considered in order to ensure the final product is not only cost-effective but also capable of satisfying specific papermaking needs.

• Papermaking Machine Specifications

  The supplier has to ensure that the roll's dimensions and design fit into the existing paper-making machines. Also, the compatibility of materials is to be accounted for, meaning that the press roll will function properly and efficiently if it coincides with the other components of the paper mill.

• Pressing Requirements

  Different types of paper require varying degrees of pressing. For example, high-pressure granite rolls might be necessary for publication paper due to its thin sheets, while lower pressure might suffice for cardboard.

• Surface Treatment

  The choice between smooth, textured, or hybrid granite rolls will depend on the desired paper quality. For instance, a smooth granite roll will produce a glossy paper finish, whereas a textured roll will provide bulk to the paper.

• Durability and Lifespan

  Investing in a high-quality granite press roll can lead to cost savings in the long term due to reduced maintenance and replacement costs.

• Supplier's Reputation

  Researching the supplier's reputation and customer reviews can provide insights into the quality of the granite press roll and the supplier's after-sales service.

• Environmental Considerations

  Some suppliers offer eco-friendly granite press rolls or sustainable sourcing options. This might be an important factor for paper mills aiming to reduce their environmental footprint.

• Cost-Benefit Analysis

  Ultimately, the decision should be based on a thorough cost-benefit analysis, considering initial investment, operational efficiency, maintenance costs, and the expected lifespan of the granite press roll.

Granite Press Roll for Paper Mill FAQ

Q1: How long do granite rolls last in a paper mill?

A1: With proper maintenance, granite press rolls can last for decades, typically 20-30 years or even longer.

Q2: What are the benefits of using granite press rolls in paper mills?

A2: Granite press rolls offer longevity, consistent paper quality, efficient water extraction, low maintenance, and resistance to abrasion.

Q3: Can damaged granite rolls be repaired?

A3: Yes, specialized repairs can address damages to granite rolls, restoring their functionality.

Q4: Do granite rolls have any environmental benefits?

A4: Yes, by efficiently extracting water from the paper sheets, granite rolls reduce the energy consumption of drying stages, which can lower the overall carbon footprint of the paper production process.