Suorastaminen

Suorastaminen is a process used in the production of paper, particularly in the context of newsprint and other types of printing paper. The term originates from the Swedish word "suorastaa," which means "to straighten." The process involves the use of a wire mesh cylinder, known as a suorastus wire, to straighten and align the fibers of the paper pulp. This is done to improve the paper's strength, smoothness, and printability.

The suorastus wire consists of a series of parallel wires that run along the length of the cylinder. As the paper pulp passes through the wire, the fibers are forced to align parallel to the direction of the wire. This alignment results in a more uniform and stronger paper structure.

The suorastaminen process is typically carried out in the wet-end of the paper machine, where the paper pulp is still in a liquid state. The pulp is fed onto the suorastus wire, which is rotating at a high speed. The wire's rotation and the pressure exerted by the pulp cause the fibers to straighten and align.

After the suorastaminen process, the paper pulp is further processed through other stages of the papermaking process, such as pressing and drying, to produce the final paper product. The suorastaminen process is crucial for the production of high-quality printing paper, as it significantly enhances the paper's ability to absorb ink and produce sharp, clear images.