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Slicing is very important for pulping because only high-quality wood chips can provide high-quality pulp. Therefore, the slicer is an important piece of equipment in the pulp process.
The slicer determines the efficiency of using expensive wood in the pulping process. All the measures adopted before the slicing process and the purpose of the slicer itself are aimed at improving the quality of the wood chips and saving in the next processing step. Conversely, after slicing, the "maturation" process of the wood chips' quality can lead to waste of raw materials and energy consumption for the wood chips. This is why Andritz Kone Wood is committed to improving the quality of the slicer as it is to the entire production process, in order to cut high-quality wood chips.
Improve the structure of the slicer
Starting from the variable situation of log supply today, the Kone WoodTM slicer is designed to have a large production capacity while maximizing the slicing quality to the greatest extent. The company widened the inlet and outlet ports of the slicer, tilted the shaft of the slicer and rationalized the slicing Angle. These improvement measures ensure the uniformity of the shape and size of the wood chips, keeping the quality consistent during the slicing process.
Widen the width of the inlet and outlet ports at the bottom of the slicer to make it possible for the slicer to cut some small-diameter logs simultaneously. Unlike ordinary slicers, the logs cannot be turned over during the slicing process because its bottom knife blades can only slice within one layer of logs. The stability of logs during slicing can reduce the loss of fibers and minimize the number of overly large wood chips. Furthermore, the design of the discharge port can ensure a continuous feeding of logs for the high-capacity slicer.
Due to the inclination of the slicer shaft, the gap between the blade and the bottom blade can be adjusted to the minimum and remain unchanged during the slicing process. All these are conducive to ensuring the high quality of wood chips and the uniformity of the size distribution of wood chips, as well as reducing the damage between wood chips and wood fibers.
The thinner the wood chips are, the greater the strength of the pulp and the higher the yield will be
The Kone Wood slicer has a large interpolation Angle because a large interpolation Angle means a thinner wood slice thickness relative to the length of the wood slice. Meanwhile, the company has the ability to increase the length of the wood chips while keeping the thickness of the wood chips unchanged or even thinner.
The cut wood chips are rectangular, not rhombic. This rectangular wood chip is conducive to filling the cooking pot, increasing the pot loading capacity and pulp production. The appearance shape of the Wood chips depends on the side Angle of the feed and discharge. The side Angle of the Kone Wood slicer is zero.
The Kone Wood slicer has been verified. The experiments were carried out at the Swedish Forest Industry Research Institute and also in the factory's own laboratory. The test results prove that the quality of the slices is very high, comparable to that of slices sliced by ordinary slicing machines and screened by efficient screening equipment.
The influence of slicing speed and discharging method on the quality of wood chips
The ideal slicing speed is 25 to 30 meters per second, and slicing machines with high production capacity can achieve such a speed. The company has reduced the rotational speed of the slicer and increased the number of blades of the slicer. A lower rotational speed, an increase in the number of blades and an extension of the length of the wood chips mean that, under a certain production capacity, even when cutting small-diameter logs, the number of wood chips cut will be reduced. The result will reduce the number of overly large wood chips and the number of small wood chips. Maintaining the high quality of Wood chips also depends on the smooth and gentle discharge side of the Kone Wood slicer. Side discharge can reduce the loss of wood chips and the generation of wood shavings. Generally, we do not recommend air conveying for unloading because it can damage or break the wood chips.
The maintenance system of the new slicer
Andritz Kone Wood has launched a comprehensive service system for the Nordic market. The HQ-Plustm service system provides services for slicers with high production capacity, including the new HQ-Knife and HQ-Quick Clamp, namely the HQ-blade and HQ-quick fastening systems. The HQ-Plus service system can help improve the quality and uniformity of wood chips, the efficient operation time of the slicer, and regular preventive maintenance. It also includes reliable spare parts services and professional inspection systems. Meanwhile, customers can also obtain the proprietary technology of Andritz Kone Wood's slicing.
The quality of wood chips is obtained from the structure of the blade and the optimal interval time for changing the blade determined by the factory according to the quality requirements of the wood chips. In addition, the acquisition of a large number of uniform wood chips is more conducive to the factory's control over the quality of wood chips.
Uniform wood chips with the same geometric dimensions are obviously conducive to further processing. When the quality of wood chips fluctuates little, problems rarely occur in the production process. The demand for chemicals in the pulping process will decrease, the cooking process will be accelerated, and the cooking yield will increase. The result is a reduction in production costs and an improvement in the quality of the final product. The improvement of the blade structure is based on our research and extensive slicing experience in the factory. The HQ-Knife can improve the uniformity of the blade and the length/thickness ratio of the wood chips. Furthermore, the reduction of wood chip damage also stems from the design of the HQ-Plus slice geometry. The HQ-Quick Clamp is a hydraulically operated device for fastening blades and has the performance of extremely fast blade replacement. The blade is installed in a box-type fixture. When it is necessary to change the blade, the blade can be easily removed from the turntable and a new blade and its fixture can be reinstalled. The box card of the blade is very light and durable without loosening the bolt.
The new mechanism for replacing blades can increase the operating time of the slicer. Generally, the downtime of a slicer is not long, and the effective slicing time can be maximized. To ensure uniform wood chip quality and operational economy, the replacement time of the blades should be determined based on the quality and quantity of the wood.
The newly developed blade system is extremely durable. The blade has a high impact resistance strength, which can reduce significant damage to the equipment and downtime. In this system, the blade has a good ability to resist impact, such as dealing with frozen wood and major wood breaks. The blade can keep its position constant and can be accurately adjusted according to the length of the wood chips.