DE102007060154B4 - grinding element - Google Patents

Abstract

Abrasive element having a flat base body (9) and an abrasive layer (1) applied to at least one main surface (5, 7) of the base body (9) with a reticulated foam whose cells are filled with particulate material (3) of predetermined hardness, characterized in that the particulate material (3) consists of mutually solidified particles.

Description

The The present invention relates to a grinding element with a flat body and one applied to at least one major surface of the body Abrasive layer with a reticulated foam, whose cells are particulate material predetermined hardness filled is.

Such a grinding element is made DE 698 18 107 T2 known. This abrasive element comprises an open-celled foam filled with abrasive particles to a working near-surface area, the grinding surface, to a depth of 2.5 mm. The abrasive particles are discrete particles that are not interconnected, but merely attached to an adhesive coatable surface of the open cells via an adhesive. The particles are thus only partially fixed to the foam material, but not with each other.

A Such determination of the abrasive particles on the coatable surfaces of the open cells is only with sufficient retention and storage stability of the particles possible, because the cells, despite their open training still largely are obtained and the coatable surfaces with a relative size over several Extend dimensions so that the particles also have a relative huge Particle circumference are fixed to these. It is also described that the penetration of the foamed resin adhesive in a completely reticulated Foam substrate can be made through the entire substrate, the Abrasive particles then be uniformly distributed along the open cells should.

By the reticulation of a foam reduces the coatable surfaces the open cells to a minimum. In fact, it remains after reticulation of a foam only a foam scaffold left, skeleton or skeleton reticulated over an area extends. The originals Cell structures are as far as possible in such a reticulated foam canceled. When using a reticulated foam substrate it is therefore not possible individual abrasive particles exclusively to the coatable surfaces to fix the existing cell remains.

Out DE 19 07 983 For example, an abrasive article and a method for its manufacture are known. Such an abrasive article should have a polyurethane foam incorporating abrasive grains to a substantial depth below the surface. A reticulated foam is not described.

The Object of the present invention is therefore a grinding element to do that to a great extent is flexible and has an abrasive layer in relation to Thickness of a basic body much greater thickness can and have over a much longer one Period repeatedly renewed itself, as with conventional Abrasive elements is the case.

The Task is solved by that the particulate material consists of mutually solidified particles consists.

by virtue of the training of the invention of the basic body As a reticulated foam there are a variety of open Pores across the loop plane the entire strength the abrasive layer filled with particulate material. The ramifications of the reticulated foam almost to "expansion joints" between Particle groups of the particulate material, the entire abrasive element a high degree of flexibility to lend. If a first layer of particulate material and reticulated Foam has been sanded, open up again and again Cells with particulate material replacing the previous cells, so that the sanding element over almost the entire strength of the flat Abrasive layer can be used.

One further advantage according to the present Invention is that the main body selected is from the group consisting of hard foam boards, wooden boards, Metal plates, plastic films, paper, cork.

By the application of the abrasive layer on the aforementioned basic bodies can give very different applications for the grinding element. Thus, the grinding element in conjunction with a body made Paper or cork for Hand sanding be used. Stronger materials than basic body can for Use when the grinding element as a grinding wheel use should find.

Further Advantages result from the features of the subclaims.

A embodiment The present invention will be described in more detail below with reference to the drawings. Show it:

1 a sectional view through an abrasive layer of a grinding element according to the present invention without solidified particulate material;

2 a sectional view through the grinding layer 1 with solidified particle material; and

3 a schematic plan view of an abrasive layer according to the present invention.

In 1 is schematically an abrasive layer 1 a sanding element S shown. The abrasive layer 1 consists of a reticulated foam. The reticulated foam is an open-cell flexible foam and, in the present embodiment, a polyurethane foam. The abrasive layer 1 has a thickness of at least 3 mm in a grinding element S according to the present embodiment, wherein the reticulated foam has a pore size of in particular 1.0 to 1.5 mm. Such an abrasive layer 1 made of reticulated foam can be cut to any size.

In other embodiments, the thickness of the abrasive layer 1 also greater or smaller than the above value. For the operability of the grinding element F, the dimensions are basically immaterial, ie, any meaningful thickness that does not limit handling, can be selected. Also the pore sizes in the soft foam of the abrasive layer 1 may vary beyond the range indicated above.

In the production of the grinding element S is in the abrasive layer 1 or in the pores a free-flowing particulate material 3 sprinkled and then solidified. The solidification can be effected in any desired manner, for example by sprinkling thermoplastic material into the free-flowing particulate material and then heating and thereby fusion of the thermoplastic material with the particulate material or by applying moisture to the free-flowing particulate material and by triggering a chemical reaction, which leads to a subsequent solidification. By spraying with moisture is meant, for example, spraying with water or with low-viscosity, liquid synthetic or natural resins. Such low viscosity liquid synthetic or natural resins include, for example, epoxy resins, acrylic resins, PU resins, polyester resins, melamine resins, or the like.

The grinding element S with its grinding layer 1 and the particulate material solidified therein 3 is in 2 shown. The grinding element S has a first main surface 5 and a second major surface 7 in the present case the first major surface 5 is opposed. The first main area 5 also consists of solidified particulate material 3 ,

The abrasive layer 1 is in the present embodiment on a base body 9 educated. Such a basic body 9 may be a tissue, paper, plastic or the like. In any case, the basic body 9 so flexible that an adaptation of the grinding element S to a substrate to be processed 11 is possible without affecting the properties of the grinding element S.

In other embodiments, on both sides of the body 9 one grinding layer each 1 be upset.

The particle material 3 can be made of any hard materials, eg. As diamond, corundum, silicon carbide, rock flour or metal meals, granules. Biomass, such as nutshells and other hard fibers, can also be processed into particulate material and used here.

Example 1:

A reticulated foam (pure base)

To produce a sanding plate, a reticulated foam (base pure) is prepared having 11.02 particles per cm (28 ppi), a thickness (thickness) of 3 mm, and a nonwoven (backing layer) of polyester having a weight of 30 g / m ² fixed. The reticulated foam is filled with a corundum mixture with a grain size of 0.1 to 500 μ and with an elastomer. The dry mixture consists of 10 wt.% With a grain size 0-100 μ, 40 wt.% 100-300 μ, 40 wt.% 400-500 μ and 10 wt.% 2K PUR elastomer.

Example 2:

alternative Silicon carbide is used under otherwise identical conditions.

1

abrasive layer

3

particulate

5

first main area

7

second main area

9

body

11

substratum

S

grinding element

Claims (6)

Abrasive element with a flat basic body ( 9 ) and one on at least one main surface ( 5 . 7 ) of the basic body ( 9 ) applied abrasive layer ( 1 ) with a reticulated foam whose cells are filled with particulate matter ( 3 ) of predetermined hardness, characterized in that the particulate material ( 3 ) consists of mutually solidified particles. Sanding element according to claim 1, characterized in that the basic body ( 9 ) is selected from the group consisting of foam boards, wood panels, metal plates, plastic films, paper, cork. Grinding element according to one of the preceding Claims, characterized in that the abrasive layer ( 1 ) consists of polyurethane. Abrasive element according to one of the preceding claims, characterized in that the abrasive layer ( 1 ) has a thickness of 3 mm. Sanding element according to one of the preceding claims, characterized characterized in that the particulate material is a solidified rock flour is. Sanding element according to one of the preceding claims, characterized characterized in that the particulate material is selected from the group consisting made of corundum, silicon carbide, diamond.