DE102007060154A1 - Sanding element for use as e.g. sanding disk, during manual sanding operation, has sanding layer formed on laminar base, where layer is reticulated foam whose cells are filled with solidified particle material of pre-determined hardness - Google Patents

Abstract

The element has a sanding layer (1) formed on a main surface of a laminar base, where the sanding layer is a reticulated foam whose cells are filled with solidified particle material of pre-determined hardness. The base is selected from a group consisting of expanded plastic slab, flexible foam plate, wooden plate, metal plate, plastic foil, paper or cork. The sanding layer is made of polyurethane and exhibits a thickness of 3 millimeter. The particle material is solidified stone dust and selected from the group consisting of corundum, silicon carbide or diamond.

Description

The The present invention relates to a grinding element with a flat body and one on at least one main surface of the basic body applied abrasive layer.

Such Abrasive elements are known from the general state of the art. They are used, for example, as a grinding wheel or sandpaper. The plane body is usually paper (sandpaper) or a harder plastic, but still flexible. On at least one main surface of the the body is a hard, grainy one Material applied, for example, quartz, diamond, corundum, etc. with different grain size. The Grain size depends on the desired grinding thickness. For finer ones Grinding is chosen a smaller grain size than for sample grinding.

If which applied to the at least one main surface of the base body Abrasive layer has been removed by the grinding process, the Discarded or disposed of abrasive element.

at Known grinding elements is on the flat body Abrasive layer applied whose life is relatively short is. In extensive grinding operations, Therefore, the grinding elements are replaced frequently.

Furthermore is the material of the body either very soft, like a sandpaper, and tears easily at edges to be ground and uneven surfaces or is too rigid to flexible enough to adapt to forms of the substrate. At a Grinding process must these considerations are taken into account.

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 abrasive layer is a reticulated foam whose cells filled with solidified particulate material of predetermined hardness.

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 star ke of the abrasive layer containing particles filled are. The ramifications of the reticulated foam almost to "expansion joints" between particle groups of the particulate material which gives 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 particulate 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 radio tion capability of the grinding element F, the dimensions are basically insignificant, ie, any reasonable 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 nut shells 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 particle 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)

Grinding element with a flat base body and an applied on at least one major surface of the base body abrasive layer, characterized in that the abrasive layer ( 1 ) is a reticulated foam whose cells are solidified with particulate matter ( 3 ) predetermined hardness is filled. Sanding element according to claim 1, characterized in that the basic body ( 9 ) is selected from the group consisting of rigid foam panels, flexible foam panels, wood panels, metal panels, plastic films, paper, cork. Sanding 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.