Flexible grinding product and method of producing the same

Abstract

The present invention relates to a flexible grinding product and a method of producing the same. Such a grinding product comprises a flexible underlay (1) which consists of two layers laminated to each other. These comprise a lower base layer (2) and an upper layer (3), a cavity layer. The underlay includes a top surface (5) having at least one adhesive layer (6) arranged thereto after lamination and a layer of grinding agent (7) applied by means of the adhesive layer. The grinding product is characterized in that the layer that is coated with grinding agent includes holes which form cavities (4), whereby the cavities provide space for grinding dust and grinding residues and facilitate their re-moval from the surface being ground.

Description

FIELD OF THE INVENTION [0001] The invention relates to a flexible grinding product according to the preamble of independent claim 1. The invention further relates to a method of producing a similar grinding product according to the preamble of independent claim 15. [0002] Grinding product of this kind includes special recesses for removal of grinding dust from the grinding surface and for cooling the grinding surface. BACKGROUND OF THE INVENTION [0003] Production of discoid grinding products consisting of a flexible underlay, such as paper, is well known. One side of the underlay is provided at least with one adhesive layer, which includes an essentially continuous layer of grinding agent substantially applied thereto. [0004] To enable continuous maintenance of the grinding product's grinding effect, as much of the grinding dust released during grinding as possible must be removed from the space between the grinding product and the grinding surface of the object being ground. As the...

AI Technical Summary

Benefits of technology

"The present invention provides a flexible grinding product that is easy to handle, has high strength, and sufficient dust removal capacity. The grinding product is produced by a method that simplifies the production process and reduces costs. The grinding product has a unique hole structure that allows for effective removal of grinding dust and cooling of the grinding surface. The adhesive layer extends over the edge surface of the hole structure, making it smooth and uniform. The grinding product can also be made very flexible by laminating two thin materials to each other. The dust transportation properties of the grinding product are better than competing products, and the grinding product can be easily applied to known grinding machines."

Problems solved by technology

Perforation causes cracks and other undesired deformations at the edges of the holes, both in the underlay and in its adhesive layer.

Due to crack formation and deformations, the material bridges between the holes must be made relatively wide because narrow material bridges can easily break.

Consequently, the holes must be placed at a relatively long distance from one another, as a result of which the grinding product is not cleaned efficiently enough and its grinding effect decreases relatively fast during grinding.

Perforation of the underlay weakens the grinding product to such an extent that a continuous grinding belt cannot be formed of it.

This edge makes the removal of grinding dust through the holes of the grinding product more difficult.

It is further generally known that the perforator wears fast during perforation because of the hard grinding agent.

The problem associated with this solution is that this grinding product cannot be used in producing a continuous grinding belt, or grinding belts made of perforated grinding products can only be produced from grinding products having a relatively thick underlay.

However, the impregnation and coating of the underlay in accordance with the above-mentioned US publication makes the underlay brittle, which means that the grinding product can be bent only a little without breaking it.

A grinding belt made of this grinding product would thus break easily in use.

If the grinding belt is sufficiently elastic so that is does not break, there is the risk that the grinding belt is stretched too much by belt tension.

The problem associated with this solution is that the cloth requires a special production technique and its use is thus expensive.

Furthermore, the finished product has the disadvantage that the cut and perforated edges are weakened by the holes that are on the cutting line since they form notches in the edge of the finished product.

Grinding products produced this way have, however, a poorer grinding capacity than the grinding products described earlier because a continuous and substantially even layer of grinding agent cannot be applied to a cloth or a net.

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