XPM - Paper Pilot for Research and Development

In paper manufacturing, there is the possibility to use different types of pulp depending on the desired end product and desired characteristics. The most common types of pulp used are chemical pulp and mechanical pulp.

In addition to these main types of pulp, various blends and treatments can be used to create specific properties in the paper. For example, additives such as calcium carbonate or kaolin can be used to improve the opacity and surface of the paper.

Regarding the use of paper for filtration purposes or as drying machines, both chemical and mechanical pulp are suitable depending on the requirements for filtration efficiency, drying capacity, and strength.

Multilayer technology involves applying multiple layers of different chemicals to the fibers to generate complex materials with specific properties and functions such as strength, flexibility, insulation, or filtration. This technology has been developed in collaboration with the Royal Institute of Technology.

The Experimental Small Paper Machine (XPM) is a versatile unit that enables the production of paper with basis weights ranging from 15 to 250 g/m², depending on the composition of the pulp used. It plays a crucial role as a tool for the development and evaluation of various paper products and manufacturing processes.

The machine serves as an initial step for evaluation and development before conducting trials on a larger pilot scale or carrying out full-scale factory experiments. It has a web width of 225 mm and is of the flat wire type. XPM is equipped with several essential components, including a pressing section, a drying cylinder section similar to those used in full-scale paper machines, and a section for surface sizing. Additionally, it features a Yankee cylinder for the production of tissue and MG paper, as well as equipment for the layer-by-layer technique to build up fiber loads.

All functional parts and process steps in XPM are proportional to those found in a large paper machine. Auxiliary equipment includes an Escher-Wyss refiner for grinding, machine chests of various sizes for different purposes, and equipment for chemical dosing at different dosing points. XPM is also equipped with a winding mechanism for finished paper for further processing, such as coating, calendering, or other surface treatments.

XPM enables a wide range of experiments and tests, including variations in fiber composition, degree of refining, basis weight, and dry content. It is also possible to evaluate new materials or chemicals, such as pigments, adhesives, retention aids, starch, or other additives. Chemical dosing occurs at the same positions as in a full-size machine and can be customized according to customer needs.

A common application of XPM is when paper mills or chemical suppliers conduct screening experiments to identify the right parameters for larger factory trials or to develop entirely new products, such as specialty papers, using existing technology. With its flexibility and scalability, XPM is an indispensable resource for research and development in the pulp and paper industry.