A polishing pad including a damping layer made of a resilient material including expanded semi-rigid polyurethane having a microcell structure, an adhesive layer including a layer of a hook-and-loop fastener adapted to interact and connect to a corresponding layer of the hook-and-loop fastener located at a bottom surface of the working element of the machine tool and a polishing layer including microfiber adapted for polishing a surface of a work piece. The polishing layer includes a fabric having a woven mesh of microfibers that define a back side of the polishing layer. The fabric serves as a barrier to the resilient material of the damping layer such that the resilient material does not reach an active side of the polishing layer comprising the microfibers when the damping layer, adhesive layer and polishing layer are combined, and such that the active side of the polishing layer is free of resilient material of the damping layer.

Provided is a flexible abrasive product (1) comprising a knitted cloth (2) on a first side of the flexible abrasive product (1), grinding agents (50) applied on a second side of the flexible abrasive product (1) facing the first side, and a plurality of loops (71) protruding from the cloth (2) and from the first side, each loop (71) being formed by a pair of bottom-half arcs (76) connected by a protruding head (77) and the loops (71) being arranged in rows extending in the wale direction (W) of the cloth (2), wherein the bottom-half arcs (76) are interlaced in the cloth (2), and the protruding heads (77) of the loops (71) are interconnected with one another outside of the cloth (2) so as to form rows (73) of interconnected loops (71), which rows (73) extend in the wale direction (W) of the cloth (2).

Provided is a flexible abrasive product (1) comprising a knitted cloth (2) on a first side of the flexible abrasive product (1), grinding agents (50) applied on a second side of the flexible abrasive product (1) facing the first side, and a plurality of loops (71) protruding from the cloth (2) and from the first side, each loop (71) being formed by a pair of bottom-half arcs (76) connected by a protruding head (77) and the loops (71) being arranged in rows extending in the wale direction (W) of the cloth (2), wherein the bottom-half arcs (76) are interlaced in the cloth (2), and the protruding heads (77) of the loops (71) are interconnected with one another outside of the cloth (2) so as to form rows (73) of interconnected loops (71), which rows (73) extend in the wale direction (W) of the cloth (2).

Methods, apparatus and systems for polishing an optical component having an aspheric or freeform surface are described. In one example aspect, a polishing device includes a solid plate and a container coupled to the solid plate. The container encloses a non-Newtonian material that exhibits a solid-like and a fluid-like behavior based on a frequency of a stress applicable to the non-Newtonian material. The device also includes a layer of viscoelastic polymer adhered to the container to polish the optical component. The layer of viscoelastic polymer comprises one or more segments positioned according to a shape of the solid plate.

Methods, apparatus and systems for polishing an optical component having an aspheric or freeform surface are described. In one example aspect, a polishing device includes a solid plate and a container coupled to the solid plate. The container encloses a non-Newtonian material that exhibits a solid-like and a fluid-like behavior based on a frequency of a stress applicable to the non-Newtonian material. The device also includes a layer of viscoelastic polymer adhered to the container to polish the optical component. The layer of viscoelastic polymer comprises one or more segments positioned according to a shape of the solid plate.

Various embodiments disclosed relate to an abrasive sheet. The abrasive sheet includes a first layer including an abrasive major surface and an opposite second layer defining a second major surface. The second major surface includes a plurality of protrusions extending outwardly from the second major surface. The protrusions include a first polymer component having at least one of a Shore A hardness ranging from about 5 to about 100 and a Shore D hardness ranging from about 1 to about 70. The first layer and the second layer are directly joined to each other.

Various embodiments disclosed relate to an abrasive sheet. The abrasive sheet includes a first layer including an abrasive major surface and an opposite second layer defining a second major surface. The second major surface includes a plurality of protrusions extending outwardly from the second major surface. The protrusions include a first polymer component having at least one of a Shore A hardness ranging from about 5 to about 100 and a Shore D hardness ranging from about 1 to about 70. The first layer and the second layer are directly joined to each other.

Abrasive articles and associated methods are shown that include one or more camouflaging layers that can be applied to a portion of the abrasive article. The one or more camouflaging layers can be applied over the size coat layer as a discontinuous colored layer covering a portion of the size coat layer. In an example, the camouflaging layer can be applied as a repeating pattern of one or more colors on the abrasive article. In an example, the camouflaging layer can be applied randomly to the abrasive article. The discontinuous layer can have a color markedly different than a color of the size coat layer and can be used to mask or minimize an appearance of particle imperfections or voids on the abrasive article. The discontinuous layer can be applicable to coated and non-woven abrasive articles in the form of sheets, discs, belts, pads, or rolls.

Abrasive articles and associated methods are shown that include one or more camouflaging layers that can be applied to a portion of the abrasive article. The one or more camouflaging layers can be applied over the size coat layer as a discontinuous colored layer covering a portion of the size coat layer. In an example, the camouflaging layer can be applied as a repeating pattern of one or more colors on the abrasive article. In an example, the camouflaging layer can be applied randomly to the abrasive article. The discontinuous layer can have a color markedly different than a color of the size coat layer and can be used to mask or minimize an appearance of particle imperfections or voids on the abrasive article. The discontinuous layer can be applicable to coated and non-woven abrasive articles in the form of sheets, discs, belts, pads, or rolls.

The present disclosure relates to polishing pads which include a polishing layer, a porous substrate and an interfacial region. The present disclosure relates to a method of making the polishing pads. The present disclosure relates to a method of polishing a substrate, the method of polishing including: providing a polishing pad according to any one of the previous polishing pads; providing a substrate, contacting the working surface of the polishing pad with the substrate surface, moving the polishing pad and the substrate relative to one another while maintaining contact between the working surface of the polishing pad and the substrate surface, wherein polishing is conducted in the presence of a polishing solution.