Abrasive base paper is an essential component in various grinding applications. Whether used for heavy grinding machines, hand grinding, or rotary machines, the paper plays a crucial role in providing the necessary support and anchoring for the abrasive grit. Additionally, it must be able to withstand the forces exerted during the grinding process and be suitable for the coating operation.

Coating and spreading the abrasive grit on the base paper is a critical step in the manufacturing process. The paper is dried and the binding resin is cured while hanging freely in drying and curing ovens. As a result, the base web becomes wet, and any internal tensions are released. To ensure the quality of the abrasive paper, it is important to control the absorbency and uniformity of the paper during this process.

Abrasive base paper is available in different weights, ranging from the lightest (70-100 g/m2 grade A) to the heaviest (220-450 g/m2, grade G). There are also specific grades designed for wet grinding and dry finishing by hand.

For heavy grinding belts, the typical paper weight is 200-250 g/m2. The furnish used for these belts is usually unbleached or semi-bleached tough long fiber pulp, with the addition of short fibers to improve formation.

Hand-finishing papers, on the other hand, are primarily used on complex surfaces and small pieces that cannot be ground using a machine. These papers need to be flexible to adapt to the surfaces being worked on. One way to achieve this flexibility is by incorporating latex as a binder in the paper structure. Another method is to wet the paper before use, which requires a high degree of wet strength. Wet grinding with these papers has the advantage of rinsing the grit with the fluid present during grinding, allowing for extended use compared to dry grinding, which can lead to faster clogging of the grit.

Sandpaper, though simple and inexpensive, is also a type of grinding paper. It is typically made using regular, high-quality kraft paper and is considered the most basic form of abrasive paper.

In conclusion, abrasive base paper is a crucial component in grinding applications. Its strength, anchoring properties, and suitability for coating operations are vital factors in determining its effectiveness. With different grades available for specific grinding needs, manufacturers can produce abrasive papers that meet the requirements of various grinding machines and techniques. Whether it’s for heavy grinding belts or hand-finishing papers, the quality and performance of abrasive base paper are essential for achieving desired grinding results.