Categories Starting with 'P'

A pump is a unit used for transportation of liquids, fluids and gases through pipes or similar channels. Pumps are nearly the most common type of machine used in all industrial and domestic applications, second to electric motors.

Plastic hoses are conveying pipes designed for location-to-location transportation of fluids. They are semi-flexible, and usually come in cylindrical shapes; they are available in several models such as convoluted or corrugated tubing, un-reinforced tubing, and braid-reinforced tubing, to provision surplus strength and pressure. Hoses of this type are engaged for transporting fluids through fluid environments; they are used to regulate fluid flow in spigots, clamps and nozzles. These hoses are common in sanitary and shower wares, as well as marine and food grade applications.

Plastic injection molding transforms molten plastic into a designed shape by pumping the molten plastic under extreme pressure into a mold made of suitable material. Upon cooling, the object is removed from the mold, retaining its shape. More complex shapes have removable sections or slides built into the mold. The raw material is in the form of pellets (resin) formulated for specific hardness and malleability applicable to the intended use of the finished product.

A pneumatic cylinder is a mechanical device that uses compressed air acting on a piston, placed in a hollow cylinder, to produce both movement and force. There are essentially two types of pneumatic cylinders, a single acting cylinder and a double acting cylinder. In the single acting cylinder, the compressed air acts only on one side of the piston and the piston is returned to its original or 'home' position by a spring incorporated on either inside or outside the hollow cylinder. The double acting cylinder is devoid of any spring and utilizes compressed air acting on the opposite side of the piston, to facilitate its return to its 'home' position.

Plastic extrusions are plastic products manufactured from plastic extrusion process. Though, in general, thermoplastics are used for the preparation of such extrusions, it remains a fact that thermoset plastics are also amenable to extrusion. Polyurethane, vinyl, acrylic, polytetrafluoroethylene (PTFE) and nylon are some among numerous materials that can be easily extruded. Numerous extrusion techniques exist: offset extrusion, overcoat extrusion, co-extrusion, oriented extrusion, ram extrusion, screw extrusion and cold extrusion. Screw extrusion remains the widely adopted approach of thermoplastic extrusion. Pipe or tubing, window frames, wire insulation, adhesive tape, plastic sheeting and weather stripping are some examples of such extruded plastic products.

A peristaltic pump is a positive displacement pump designed to pump a variety of fluids contained within flexible tubing. Typically, the fluid is being pumped between rollers placed on a rotary hub that trap the fluid between them by sealing the tube on either side. On rotating, one of the rollers unseals the tubing, allowing the remaining rollers to force the fluid through the discharge port of the pump. The liquid fills up the tubing behind the lagging roller and the pumping process is repeated again. Peristaltic pumps are relatively inexpensive to manufacture and commercially used in industries such as printing, chemical, and food processing. They also have a variety of uses in the medical field. Since there is very little damage caused by the mechanical action of the roller on the fluid, a peristaltic pump is ideal for pumping such fluids as blood, and is used for that purpose in blood filtration devices.

Progressive stampings are formed by a metalworking methodology in which several dies are used together on the same metal sheet. As the material progresses, each single part is stamped in a sequence of steps till it assumes the final shape. This type of metal forming manufacturing is optimal as well as reliable for process demanding high-speed production, swift implementation times and cost-efficient tooling. Domains of application include electronics, medicine, automotive, telecommunications, aerospace, consumer products and power tool industries.