Grinding means

Abstract

The invention relates to a grinding means, in particular a flexible grinding means, for grinding a workpiece with a grinding element, comprising an in particular flexible carrier element for arranging the grinding element on the carrier element, and comprising a binder element for holding the grinding element on the carrier element, wherein the carrier element is made of a non-woven fabric. According to the invention, the grinding means has a perforation extending in particular through the entire grinding means (11).

Description

[0001] Description

[0002] title

[0003] Abrasives

[0004] The invention relates to an abrasive according to the preamble of claim 1.

[0005] State of the art

[0006] Abrasives with a carrier element made of a nonwoven fabric are known.

[0007] Disclosure of the invention

[0008] The invention is based on the object of improving an abrasive with simple constructive measures.

[0009] The object is achieved with an abrasive, in particular a flexible abrasive, for grinding a workpiece with a grinding element, with a, in particular flexible, carrier element for arranging the grinding element on the carrier element and with a binder element for holding the grinding element on the carrier element.

[0010] It is proposed that the abrasive has a perforation extending, in particular, through the entire abrasive.

[0011] It is proposed that the carrier element is formed from a nonwoven fabric.

[0012] The present abrasive is particularly advantageously designed to be flexible, which allows the abrasive to be folded and unfolded particularly easily, in particular reversibly. This can be done while avoiding tearing of the abrasive. Furthermore, the abrasive can be designed to be flexible or elastic such that the abrasive can be stretched by approximately more than 5%, in particular more than 10%, preferably more than 15%, preferably more than 20%, without the abrasive tearing.

[0013] This allows a stable sanding corner to be provided when folded along the perforation of the abrasive, which can better reach and sand angled areas to be sanded.

[0014] The perforation makes it easier to fold the abrasive along the perforation. This allows the abrasive to be used in a folded state on a flat surface.

[0015] Abrasives

[0016] In particular, the abrasive has a longitudinal extension or - in the case of a disc - a diameter of up to 500 mm, in particular up to 400 mm, preferably up to 300 mm, preferably up to 200 mm, particularly preferably up to 170 mm, such as 150 mm or even less.

[0017] In particular, the abrasive has a thickness of up to 5 mm, in particular up to 3 mm, preferably up to 2 mm, preferably up to 1 mm, particularly preferably up to 0.5 mm, such as 0.4 mm or even less.

[0018] In particular, the abrasive is designed to be flexible in order to compensate for local irregularities and provide an optimal grinding pattern. In particular, "flexible" is understood as being made of or containing a resilient material.

[0019] The abrasive preferably has a plurality of grinding elements on one side, in particular a surface, of the carrier element. The grinding elements preferably protrude from the carrier element and / or delimit the grinding element. The abrasive preferably serves for grinding or abrasive machining of a workpiece, during which material of the workpiece is mechanically removed from the surface of the workpiece in the form of chips. The abrasive preferably is a composite abrasive.

[0020] The abrasive can be available in various forms, for example, as a grinding disc or belt, as a sheet, roll, strip, or even as abrasive web (e.g., in production). In particular, the abrasive article can be manufactured for use with sanding machines such as random orbital sanders or for hand sanding.

[0021] Grinding element

[0022] In particular, the grinding element is intended for grinding a workpiece. In particular, the grinding element has a deforming and / or abrasive effect on the workpiece to be machined. In particular, the grinding element is designed as an abrasive body. The grinding element is known to a person skilled in the art, among other things, as abrasive grain. In particular, the grinding element is an element that contacts a workpiece to be machined in a processing state, in particular directly, and that, in a processing state, leads to abrasive material removal from the workpiece to be machined.

[0023] Preferably, the grinding element is designed as a broken and / or shaped grinding element.

[0024] The grinding element is not limited to a specific material, but can be made of, for example, corundum (in various variants, in particular white corundum, semi-precious corundum, blue corundum, zirconium corundum, ceramic corundum and / or brown corundum), silicon carbide, cubic boron nitride, diamond or mixtures thereof.

[0025] Support element

[0026] Preferably, the carrier element is formed from a nonwoven fabric. Preferably, the

[0027] Nonwoven fabric formed from fibers (of limited length), continuous fibers (filaments) or (cut) yarns. These fibers are preferably combined to form a nonwoven or a fiber layer or a fiber web and connected to one another in a suitable manner. The carrier element is preferably not woven. The carrier element preferably has a plurality of fibers. The fibers are preferably consolidated, in particular by means of a suitable process. The fibers are preferably mechanically, chemically and / or thermally consolidated. The fibers are preferably consolidated to form a (fiber) composite. The fibers of the carrier element are preferably connected to one another. The carrier element is preferably mechanically, chemically and / or thermally consolidated. The fibers are preferably cohesively consolidated. The fibers are preferably adhesively and / or cohesively consolidated. The fibers are preferably formed from a thermoplastic material.Preferably, the fibers, especially those made from the same raw material, are bonded or bonded together without additional binding agents. The fibers are preferably bonded by, in particular, temporary, heat and / or pressure. The fibers can preferably be bonded by heated embossing calenders or ultrasonic bonding systems. This allows adjacent fibers to be thermally bonded together at their contact points. The carrier element is preferably designed as a spunbonded nonwoven fabric.

[0028] The carrier element preferably serves as a carrier layer and imparts specific properties to the abrasive with regard to adhesion, elongation, tear and tensile strength, flexibility, and stability. The abrasive elements can preferably be applied to and fixed on the carrier layer. The abrasive elements can preferably be arranged and / or bonded to the carrier element by means of a known binder element. For example, in the case of a coated abrasive, the abrasive elements adhere to the carrier element due to the binder element. The abrasive grains can be pre-fixed in the desired position and distribution on the carrier element by means of the binder element. Suitable binder elements for attaching abrasive elements to the carrier element are well known to those skilled in the art. In particular, the carrier element is made of a material with a specific weight in a range of at least 35 to a maximum of 400 g / m A2, in particular at least 50 to a maximum of 150 g / m A 2, preferably at least 50 to a maximum of 75 g / m A 2 formed.

[0029] In particular, the carrier element is designed to be flexible in such a way that the carrier element can be stretched essentially elastically by more than 15%, in particular more than 20%, preferably more than 30%, preferably more than 35% in a first direction and in a second direction oriented perpendicular to the first direction. In particular, the carrier element and / or the fibers of the carrier element have a tensile strength of at least 70 N, in particular at least 80, preferably at least 100 N. In particular, the carrier element has a thickness of less than 0.4 mm, in particular less than 0.3 mm. This makes it possible to provide a carrier element which is temperature-stable with respect to deformation and shrinkage. This makes it possible to bond the carrier element to a TPU binder element while avoiding deformation.Preferably, a polyethylene terephthalate (PET) is formed as the carrier element instead of a polypropylene (PP) or a polyethylene (ÜPE).

[0030] Binder element

[0031] The binder element is preferably provided for holding the abrasive element to the carrier element. The binder element is preferably designed as a film element, in particular an adhesive film element, which is arranged on the side of the carrier element facing away from a grinding side. The binder element is preferably bonded to the carrier element over its entire surface. The binder element is preferably formed from a base binder element and / or a cover binder element. The binder element is preferably provided for covering the carrier element and / or the abrasive element. The base binder element and / or the cover binder element are preferably arranged as layers on the carrier element.The binder element should preferably form a material or mixture of materials, particularly one arranged over a large area, which is arranged in the normal direction of a main extension surface of a carrier element of the abrasive, particularly directly, between a surface of the carrier element of the abrasive and the grinding element(s). The binder element is preferably provided for a material-to-material bond between the grinding element(s) and the carrier element of the abrasive. This allows for a preferably good and reliable adhesion and material-to-material bond of the binder element to the at least one surface of the at least one base body of the grinding unit to be achieved.

[0032] Synthetic resins, such as phenolic resin, epoxy resin, urea resin, melamine resin, polyester resin, or the like, are particularly suitable as the binder element. The base binder element and the top binder element can also contain other conventional active ingredients and / or fillers. The binder element is preferably made of a synthetic resin, in particular a TPU, preferably a phenolic resin. Alternatively, the binder element can contain or consist of a PU dispersion, an acrylate, or an epoxy.

[0033] Preferably, the binder element is flexible and stable enough to allow folding and grinding. The extensibility of the binder element, measured according to DIN 53504-S2, is preferably more than 200%, in particular more than 400%, preferably more than 600%. The binder element preferably has a melting temperature of more than 100°C, in particular more than 120°C, preferably more than 140°C. To enable stable use of the abrasive, an operating temperature of the abrasive of more than 160°C, in particular more than 180°C, preferably more than 200°C is also required. In particular, the binder element has a specific weight in a range of at least 80 to at most 300 g / m². A 2, in particular from at least 90 to a maximum of 180 g / m A 2, preferably from at least 120 to at most 170 g / m A2. Preferably, the abrasive has a tear resistance with a tear force measured according to BS EN ISO 1798-2008 of more than 35 N.

[0034] This makes it possible to provide a flexible and stable abrasive. This makes it possible to provide an abrasive whose grinding elements can move past each other in a folded state of the abrasive without damaging the opposing grinding elements.

[0035] perforation

[0036] In particular, the perforation extends along an entire extent, in particular from one end to the other end, of the abrasive. In particular, the perforation extends along a perforation line. In particular, the perforation is formed from a plurality of recesses. In particular, the recess extends through the entire abrasive, in particular a thickness of the abrasive. In particular, the recess extends from one side of the abrasive to a side of the abrasive facing away from the side. In particular, the recess is surrounded by the abrasive, in particular completely. In particular, the abrasive, in particular the carrier element and / or the binder element, delimits the recess, in particular completely. In particular, the perforation is introduced into the abrasive by means of a punching process, a laser process, a piercing process (e.g. needle roller) or the like.

[0037] The perforation allows for a smaller radius, making it particularly easy to sand corners or angled areas. Furthermore, the perforation can be designed in such a way that tearing of the abrasive along the perforation is avoided.

[0038] The subclaims specify further expedient developments of the abrasives according to the invention.

[0039] It may be advantageous for the perforation to be arranged along a perforation line, with the perforation line running straight and / or curved. This allows for optimized grinding in hard-to-reach areas. For example, a curved perforation line can provide a larger grinding edge.

[0040] It may be expedient for the abrasive to have a further perforation arranged along a further perforation line, wherein the further perforation line is arranged transversely, in particular perpendicularly, to the perforation line. It may be expedient for the perforation to have two recesses and a web delimiting the two recesses, wherein the web has a length that is less than a length of the recess, in particular of each recess. In particular, the recess is slit-shaped. In particular, the recess has a width that is much smaller than its length.In particular, two adjacent recesses are spaced apart from one another by at least 0.5 mm, in particular at least 0.8 mm, preferably at least 0.9 mm, preferably at least 1 mm, particularly preferably at least 1.1 mm, more preferably at least 1.2 mm, further preferably at least 1.4 mm, and / or at most 2.5 mm, in particular at most 2.2 mm, preferably at most 1.8 mm, preferably at most 1.5 mm, more preferably at most 1.2 mm, such as 1 mm. In particular, the recess, in particular each recess, has an extension of at least 1 mm, in particular at least 1.2 mm, preferably at least 1.5 mm, preferably at least 1.8 mm, particularly preferably at least 2 mm, further preferably at least 2.2 mm, further preferably at least 2.5 mm, and / or at most 4 mm, in particular at most 3.5 mm, preferably at most 3 mm, preferably at most 2.5 mm, further preferably at most 2.2 mm, such as 2 mm.In particular, the recesses are arranged along and / or tangentially to the perforation line. In particular, the extension of the, in particular each, recess compared to a distance to a, in particular each, adjacent recess is designed in a ratio of approximately at least 1 to at most 3, in particular 1.5 to at most 2.5, preferably 2.8 to at most 2.2, such as 2. This makes it possible to provide an abrasive with particularly advantageous folding properties. With a high ratio, the abrasive can be bent more easily. As a result, a smaller bending radius can be achieved. With a low ratio, a larger bending radius can be achieved. With a smaller distance between adjacent recesses, the grinding surface becomes correspondingly smaller, since the grinding process takes place with the abrasive in a folded state between the recesses.However, with a small distance between adjacent recesses, the stability of the abrasive in a folded state is reduced.

[0041] It may be expedient for the carrier element to be formed from a thermoplastically, in particular cohesively, consolidated nonwoven fabric. The nonwoven fabric preferably has a plurality of bonding points. The bonding points preferably form local consolidations of the fibers of the carrier element, in particular the nonwoven fabric. The bonding points are preferably arranged uniformly over the extent, in particular the length and width, of the carrier element. The bonding points are preferably spaced apart from one another. Preferably, the bonding points are arranged, if possible, at the intersection points of the fibers. Preferably, the bonding points form a pattern. The bonding points are preferably produced by means of an embossing, ultrasonic, or binder printing process.

[0042] It may be expedient for the carrier element to be formed from a synthetic polymer, in particular a polyester nonwoven fabric, preferably a PET nonwoven fabric.

[0043] It may be advantageous for the support element to have an indentation / recess, particularly for receiving the binder element. This allows for a more secure connection between the support element and the binder element.

[0044] It may be expedient for the carrier element to have a first carrier side and a second carrier side facing away from the first carrier side, wherein the binder element and / or the abrasive is arranged on the first carrier side, wherein a further binder element and / or a further abrasive is arranged on the second carrier side. As a result, when the abrasive is folded, opposing abrasive elements can engage in spaces between the abrasive elements and enable a type of interlock. As a result, sliding of two superimposed abrasive regions of the abrasive can be reduced or prevented. This enables better grinding using such an abrasive in the folded state.

[0045] It may be expedient for the binder element to be arranged directly on the carrier element. The binder element is preferably arranged directly on the carrier element without the use of an intermediate element, in particular an intermediate layer, and in particular is connected to it. The binder element is preferably arranged over its entire surface on the carrier element. The binder element is preferably arranged on both sides of the carrier element. The binder element preferably delimits the carrier element on both sides. The binder element is preferably designed as a binder layer. This makes it possible to provide a particularly flexible and robust abrasive.

[0046] It may be expedient for the binder element to be arranged substantially between the carrier element and the grinding element. It may be expedient for the binder element to have a first binder side facing the carrier element and a second binder side facing away from the carrier element. In particular, the binder element is substantially structured on the first binder side. In particular, the binder element is substantially planar on the second binder side. As a result, grinding elements can engage and be held in opposing binder elements when the abrasive is folded, without rubbing against one another or becoming blunt against one another during grinding.

[0047] It may be expedient for the recess to intersect the depression. In particular, the depression is intended to accommodate the binder element. In particular, the depression is formed by the bonding point of the carrier element, in particular the nonwoven fabric. This results in a certain difference in height, particularly in the thickness, of the binder element in the region of the depression of the carrier element.

[0048] A system comprising a plurality of abrasives according to one of the preceding claims, characterized in that the abrasives are connected to one another via the further perforation. Brief description of the drawings

[0049] Further advantages will become apparent from the following description of the drawings. The drawings illustrate exemplary embodiments of the invention. The drawings, the description, and the claims contain numerous features in combination. Those skilled in the art will also conveniently consider the features individually and combine them into useful further combinations. Here:

[0050] Fig. 1 a view of an abrasive in the folded state during manual grinding,

[0051] Fig. 2 a section through an exemplary abrasive,

[0052] Fig. 3 another section through an exemplary abrasive,

[0053] Fig. 4 a view of an abrasive,

[0054] Fig. 5 is an enlarged view of a support element,

[0055] Fig. 6 a view of the abrasive in a folded state and

[0056] Fig. 6 is another view of the abrasive in a folded state.

[0057] In the following figures, identical components are provided with the same reference numerals.

[0058] The present abrasive 11 is for manual or hand-machining of a workpiece, as can be seen in Fig. 1.

[0059] Fig. 2 shows a flexible abrasive 11 for grinding a workpiece with a grinding element 13, with a flexible carrier element 15 for arranging the grinding element 13 on the carrier element 15 and with a binder element 17 for holding the grinding element 13 on the carrier element 15.

[0060] The abrasive 11 has a perforation 21 extending through the entire abrasive 11. The carrier element 15 is formed from a nonwoven fabric. In the present case, the abrasive 11 has a plurality of abrasive elements 13 on one abrasive side, wherein the abrasive elements 13 protrude from the carrier element 15 and delimit it.

[0061] The abrasive 11 is preferably used for grinding or abrasive machining of a workpiece, in which material of the workpiece is mechanically removed from the surface of the workpiece in the form of chips. The abrasive 11 is preferably a composite abrasive 11.

[0062] The abrasive 11 can be available in various forms. In this case, the abrasive 11 is designed as a rectangular part of a grinding roll.

[0063] In the present case, the grinding element 13 is intended for grinding a workpiece and is designed as a broken and / or shaped grinding element 13.

[0064] In the present case, the carrier element 15 is formed from a nonwoven fabric and comprises a plurality of fibers. The fibers are mechanically and / or thermally bonded, in particular cohesively bonded, to form a (fiber) composite using a suitable process, thereby correspondingly bonding the carrier element 15. The fibers are cohesively bonded and formed from a thermoplastic material. The carrier element 15 is designed as a spunbonded nonwoven fabric.

[0065] The carrier element 15 serves as a carrier layer on which the abrasive elements 13 are applied and fixed. The abrasive elements 13 are arranged and bonded to the carrier element 15 by means of a known binder element 17. The carrier element 15 is made of a material with a specific weight in a range of at least 35 to a maximum of 400 g / m A 2, in particular at least 50 to a maximum of 150 g / m A 2, preferably at least 50 to a maximum of 75 g / m A2. The carrier element 15 is designed to be flexible such that the carrier element 15 can be stretched substantially elastically by more than 15%, in particular more than 20%, preferably more than 30%, preferably more than 35%, in a first direction and a second direction oriented perpendicular to the first direction. The carrier element 15 and / or the fibers of the carrier element 15 have a tensile strength of at least 70 N, in particular at least 80, preferably at least 100 N, wherein the carrier element 15 has a thickness of less than 0.4 mm, in particular less than 0.3 mm. In the present case, the carrier element 15 is formed from a polyethylene terephthalate (PET).

[0066] The binder element 17 is provided for holding the grinding element 13 to the carrier element 15 and is fully bonded to the carrier element 15. The binder element 17 is provided for covering the carrier element 15 and / or the grinding element 13 and is arranged as a layer on the carrier element 15.

[0067] In the present case, the binder element 17 is provided for a materially bonded connection between the grinding element(s) 13 and the carrier element 15 of the abrasive 11. The binder element 17 is formed from a synthetic resin, in particular a TPU, preferably a phenolic resin.

[0068] In the present case, the perforation 21 extends along an entire extent from one end to the other end of the abrasive means 11 (Figs. 4, 6, 7). The perforation 21 extends along a perforation line 23. The perforation 21 is formed from a plurality of recesses 25. Each recess 25 extends through the entire thickness of the abrasive means 11. Each recess 25 extends from one side (front side) of the abrasive means 11 to a side facing away from the side (back side) of the abrasive means 11. The recesses 25 are essentially completely surrounded by the abrasive means 11. The abrasive means 11, or the carrier element 15 and the binder element 17, completely delimit / delimit the recess 25. The perforation 21 is arranged along a perforation line 21, wherein the perforation line 21 is straight and / or curved.The abrasive 11 has a further perforation 21 (not shown), which is arranged along a further perforation line 21, wherein the further perforation line 21 is arranged transversely, in particular perpendicularly, to the perforation line 21. The perforation 21 has at least two recesses 25 and a web 27 delimiting the two recesses 25, wherein the web 27 has a length which is less than a length of the, in particular each, recess 25. The recess 25 is slit-shaped. The recess 25 has a width which is much smaller than its length. In particular, two adjacent recesses 25 are spaced apart from one another by a distance (length of the web 27) of at least 0.9 mm and at most 1.2 mm, such as 1 mm. In the present case, the, in particular each, recess 25 has an extension of at least 1.8 mm and at most 2.2 mm, such as 2 mm.The recesses 25 are arranged along the perforation line 21. In the present case, the extension of the, in particular each, recess 25 relative to a distance to a, in particular each, adjacent recess 25 is formed in a ratio of approximately 2.8 to at most 2.2, such as 2.

[0069] The carrier element 15 is formed from a thermoplastically cohesively bonded nonwoven fabric. The nonwoven fabric has a plurality of bonding points 33, which form local bondings of the fibers of the carrier element 15s, in particular of the nonwoven fabric. The bonding points 33 are arranged uniformly over the extent or the length and width of the carrier element 15s. The bonding points 33 are arranged at a distance from one another. The bonding points 33 are arranged, if possible, at the intersection points of the fibers and form a pattern. The bonding points 33 are preferably produced by means of an embossing, ultrasonic, or binder printing process.

[0070] The carrier element 15 is formed from a synthetic polymer, in particular a polyester nonwoven fabric, preferably a PET nonwoven fabric. The carrier element 15 has an indentation / recess 35 for receiving the binder element 17. The indentations / recesses 35 are formed by the bonding points 33. The carrier element 15 has a first carrier side and a second carrier side facing away from the first carrier side, wherein the binder element 17 and / or the abrasive 11 is arranged on the first carrier side, wherein a further binder element 17 and / or a further abrasive 11 is arranged on the second carrier side (Fig. 3).

[0071] The binder element 17 is arranged directly on the carrier element 15, i.e., without the use of an intermediate element, in particular an intermediate layer, and is particularly connected to it. The binder element 17 is arranged over its entire surface on the carrier element 15. The binder element 17 is arranged on both sides of the carrier element 15. The binder element 17 borders the carrier element 15 on both sides and is designed as a binder layer.

[0072] The binder element 17 is arranged essentially between the carrier element 15 and the grinding element 13 (Fig. 2, Fig. 3). The binder element 17 has a first binder side facing the carrier element 15 and a second binder side facing away from the carrier element 15. The binder element 17 is substantially structured on the first binder side, and the binder element 17 is substantially flat on the second binder side.

[0073] The recess 25 intersects the depression 35, which is provided for receiving the binder element 17. The depression 35 is formed by the bonding point of the carrier element 15, in particular the nonwoven fabric.

Claims

Claims 1 . Abrasive, in particular flexible abrasive (11), for grinding a workpiece with a grinding element (13), with a, in particular flexible, carrier element (15) for arranging the grinding element (13) on the carrier element (15) and with a binder element (17) for holding the grinding element (13) on the carrier element (15), wherein the carrier element (15) is formed from a nonwoven fabric, characterized by a perforation (21) extending, in particular, through the entire abrasive (11).

2. Abrasive according to claim 1, characterized in that the perforation (21) is arranged along a perforation line (21), wherein the perforation line (21) is straight and / or curved.

3. Abrasive according to one of the preceding claims, characterized by a further perforation (21) which is arranged along a further perforation line (21), wherein the further perforation line (21) is arranged transversely, in particular perpendicularly, to the perforation line (21).

4. Abrasive according to one of the preceding claims, characterized in that the perforation (21) has two recesses (25) and a web (27) delimiting the two recesses (25), wherein the web (27) has a length which is smaller than a length of the, in particular each, recess (25).

5. Abrasive according to one of the preceding claims, characterized in that the carrier element (15) is formed from a thermoplastic, in particular cohesive, consolidated nonwoven fabric.

6. Abrasive according to one of the preceding claims, characterized in that the carrier element (15) is formed from a synthetic polymer, in particular a polyester nonwoven fabric, preferably from a PET nonwoven fabric.

7. Abrasive according to one of the preceding claims, characterized in that the carrier element (15) has a recess (35), in particular for receiving the binder element (17).

8. Abrasive according to one of the preceding claims, characterized in that the carrier element (15) has a first carrier side and a second carrier side facing away from the first carrier side, wherein the binder element (17) and / or the abrasive (11) is arranged on the first carrier side, wherein a further binder element (17) and / or a further abrasive (11) is arranged on the second carrier side.

9. Abrasive according to one of the preceding claims, characterized in that the binder element (17) is arranged directly on the carrier element (15).

10. Abrasive according to one of the preceding claims, characterized in that the binder element (17) is arranged substantially between the carrier element (15) and the grinding element (13). 11 . Abrasive according to one of the preceding claims, characterized in that the binder element (17) has a first binder side facing the carrier element (15) and a second binder side facing away from the carrier element (15), wherein the binder element (17) is substantially structured on the first binder side, wherein the binder element (17) is substantially flat on the second binder side.

12. Abrasive according to one of the preceding claims, characterized in that the recess (25) intersects the depression (35).

13. System consisting of a plurality of abrasives (11) according to one of the preceding claims, characterized in that the abrasives (11) are connected to one another via the further perforation (21).

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