Archive

Physical properties Polyethylene is a thermoplastic polymer consisting of long hydrocarbon chains. Depending on thecrystallinity and molecular weight, a melting point and glass transition may or may not be observable. The temperature at which these occur varies strongly with the type of polyethylene. For common commercial grades of medium- and high-density polyethylene the melting point is typically in the range 120 to 180 °C (248 […]

Variation of luster: nylon has the ability to be very lustrous, semilustrous or dull. Durability: its high tenacity fibers are used for seatbelts, tire cords, ballistic cloth and other uses. High elongation Excellent abrasion resistance Highly resilient (nylon fabrics are heat-set) Paved the way for easy-care garments High resistance to insects, fungi, animals, as well […]

Definition Meter units (MU) are oil proportioning devices for single line resistance cyclic systems. Each outlet of a lubricating system is controlled by a meter unit. The lubricator in the system dispenses oil to the distribution network and meter units deliver this oil in varying amounts to the friction points.  Control units (CU) are oil […]

Author: Michael Khonsari, E.R. Booser With improvements in oil formulations, oil mist lubrication systems are becoming increasingly popular in a variety of applications where only limited oil feed supply is required. Examples include bearings of electric motors, pumps and compressors in many oil refineries and petrochemical plants1; gears, cams, chains and sliding surfaces of machines […]

A screw thread, often shortened to thread, is a helical structure used to convert between rotational and linear movement or force. A screw thread is a ridge wrapped around a cylinder or cone in the form of a helix, with the former being called a straight thread and the latter called a tapered thread. A screw thread is the essential feature of the screw as a simple machine and […]

Selection of a positive displacement (PD) rotary pump is not always an easy choice. There are four common types of PD pumps available:  internal gear, external gear, timed lobe, and vane. Most PD pumps can be adapted to handle a wide range of applications, but some types are better suited than others for a given […]

By definition, positive-displacement (PD) pumps displace a known quantity of liquid with each revolution of the pumping elements. This is done by trapping liquid between the pumping elements and a stationary casing. Pumping element designs include gears, lobes, rotary pistons, vanes, and screws. PD pumps are found in a wide range of applications — chemical-processing; […]

Gerotor Pump Overview Gerotor pumps are internal gear pumps without the crescent. The rotor is the internal (drive) gear shown below in gray, and the idler is the external (driven) gear, shown below in orange. They are primarily suitable for clean, low pressure applications such as lubrication systems or hot oil filtration systems, but can […]