A polishing device for polishing bristles includes a grinding surface and a friction material thereon, the friction material having aramid fibers or pulp bonded with a polyimide resin.

A polishing pad is provided. The polishing pad comprises a polishing layer and a metal-containing layer. The polishing layer has a polishing surface and a backside surface opposite to each other, wherein the backside surface has a plurality of cavities. The metal-containing layer is disposed on the backside surface of the polishing layer and fills into the cavities, wherein a first contact area is between the metal-containing layer and the backside surface of the polishing layer, and the first contact area is larger than the orthogonal projection area of the polishing layer.

Examples are disclosed that relate to planarizing substrates without use of an abrasive. One example provides a method of chemically planarizing a substrate, the method comprising introducing an abrasive-free planarization solution onto a porous pad, contacting the substrate with the porous pad while moving the porous pad and substrate relative to one another such that higher portions of the substrate contact the porous pad and lower portions of the substrate do not contact the porous pad, and removing material from the higher portions of the substrate via contact with the porous pad to reduce a height of the higher portions of the substrate relative to the lower portions of the substrate.

In methods and systems of making an abrasive article, abrasive particles are loaded to a distribution tool including a plurality of upper walls defining a plurality of spacing slots, and a plurality of lower walls defining a plurality of distribution slots. The spacing slots are open to the distribution slots, which are open to a lower side of the tool. The loaded particles are spaced and distributed from the distribution tool to a major face of a backing web below the lower side and moving relative to the tool in a machine direction. The upper walls space the particles in the machine direction. The particles distributed by the lower walls undergo an orientation sequence in which each particle is oriented into a column aligned along the machine direction. The upper walls can be disposed oblique to the lower walls. The upper and lower walls can have pointed upper portions.

A foam abrasive for grinding a workpiece includes a main part made of foam, in particular polyurethane foam, and abrasive grains which are fixed to at least one surface of the foam abrasive via a base binder made of thermoplastic polyurethane. The abrasive grains are covered with a cover binder.

Provided is a grinding element for use in rotary grinding or polishing tools used for grinding or polishing surfaces, and of the type comprising an elongate profile rail, including an abrasive cloth and support brushes. The abrasive cloth and the support brushes are mounted in or on the profile rail, such that the abrasive cloth is supported by the support brushes on its inactive side. The abrasive cloth outside the profile rail has a height in the vertical direction and a length in the longitudinal direction. The support brushes and the abrasive cloth have different heights, a support brush height and an abrasive cloth height, respectively, from the profile rail, such that the abrasive cloth is terminated by an outer exposed edge area extending beyond the top of the support brushes and a short distance down along the outer exposed end portions of the support brushes.

A method of making abrasive particles includes: providing a slurry comprising non-colloidal solid particles and a liquid vehicle; forming at least a portion of the slurry into shaped bodies contacting a substrate; at least partially drying the shaped bodies to provide shaped abrasive precursor particles; separating at least a portion of the shaped abrasive precursor particles from the substrate; and converting at least a portion of the shaped abrasive precursor particles into shaped abrasive particles. The shaped abrasive particles comprise alpha alumina having an average crystal grain size of 0.8 to 8 microns and an apparent density that is at least 92 percent of the true density. Each shaped abrasive particle has a respective surface comprising a plurality of smooth sides that form at least four vertexes. Shaped abrasive particles, abrasive articles including them, and methods of using are also disclosed.

A method of making abrasive particles includes: providing a slurry comprising non-colloidal solid particles and a liquid vehicle; forming at least a portion of the slurry into shaped bodies contacting a substrate; at least partially drying the shaped bodies to provide shaped abrasive precursor particles; separating at least a portion of the shaped abrasive precursor particles from the substrate; and converting at least a portion of the shaped abrasive precursor particles into shaped abrasive particles. The shaped abrasive particles comprise alpha alumina having an average crystal grain size of 0.8 to 8 microns and an apparent density that is at least 92 percent of the true density. Each shaped abrasive particle has a respective surface comprising a plurality of smooth sides that form at least four vertexes. Shaped abrasive particles, abrasive articles including them, and methods of using are also disclosed.

The present invention relates generally to coated abrasive articles, such as coated abrasive film belts having improved strength and durability, as well as methods of making and using said coated abrasive articles.

A shaped abrasive particle is presented. The shaped abrasive particle has a first and second surface. The first and second surfaces are substantially parallel to each other and separated by a thickness. Each of the first and second surfaces have a surface profile, which includes a plurality of corners and a plurality of edges connecting the plurality of corners. The shaped abrasive particle also includes a recess included wholly within one of the plurality of edges, wherein the recess is a concave void extending into the surface profile. The shaped abrasive particle also includes a magnetically responsive coating. The magnetically responsive coating causes the shaped abrasive particle to be responsive to a magnetic field. The shaped abrasive particle, when exposed to the magnetic field, experiences a net torque that causes the shaped abrasive particle to orient with respect to the magnetic field such that each of the first and second surfaces are substantially perpendicular to a backing.