glasses, also known as eyeglasses or spectacles, are vision aids, consisting of glass or hard plastic lenses mounted in a frame that holds them in front of a person's eyes, typically utilizing a bridge over the nose and arms which rest over the ears.. glasses are typically used for vision correction, such as with reading glasses and glasses used for nearsightedness.
rotary screen printing. i've just added the section on rotary screen printing, which is not well known but is industrially important in one or two niches. two queries: 1. i don't really get the flow of the article very well, so i may have added the new section in the wrong place. 2.
ground glass is glass whose surface has been ground to produce a flat but rough finish, in which the glass is in small sharp fragments.. ground glass surfaces have many applications, ranging from ornamentation on windows and table glassware to scientific uses in optics and laboratory glassware
rotary screen printing. a development of screen printing with flat screens from 1963 was to wrap the screen around to form a tube, with the ink supply and squeegee inside the tube. the resulting roller rotates at the same speed as the web in a roll-to-roll machine. the benefits are high output rates and long rolls of product.
powder coating on glass is a specialized procedure related to traditional powder coating, which is the technique of applying electrostatically charged, dry powdered particles of pigment and resin to a solid item's surface. it requires its own unique process, however, because glass is a poor electrical conductor in comparison to metal, the traditional powder coating substrate.
a clear view screen or clearview screen is a glass disk mounted in a window that rotates to disperse rain, spray, and snow. a clear view screen is typically driven by an electric motor at the center of the disk, and is often heated to prevent condensation or icing.
trommel screen. a trommel screen, also known as a rotary screen, is a mechanical screening machine used to separate materials, mainly in the mineral and solid-waste processing industries. it consists of a perforated cylindrical drum that is normally elevated at an angle at the feed end.
laboratory flasks have traditionally been made of glass, but can also be made of plastic. at the opening s at top of the neck of some glass flasks such as round-bottom flasks, retorts, or sometimes volumetric flasks, there are outer or tapered conical ground glass joints.
the glass frit is a paste consisting glass powder, organic binder, inorganic fillers and solvents. this low melting glass paste is milled into powder grain size < 15 μm and mixed with organic binder forming a printable viscous paste.
screen decks can be mounted on top of another within the machine assembly with spacing frames connected together via stainless steel quick release clamps. there are large amounts of gyratory equipment designs available with some possible design characteristics include: feed rates of 1–50,000 kg/h; screen layers up to 7
a bonded abrasive is composed of an abrasive material contained within a matrix, although very fine aluminium oxide abrasive may comprise sintered material. this matrix is called a binder and is often a clay, a resin, a glass or a rubber.this mixture of binder and abrasive is typically shaped into blocks, sticks, or wheels. the most common abrasive used is aluminium oxide.