Packing (redirected from Packing (disambiguation))

packing

1. the packaging of foodstuffs

2. Med

a. the application of a medical pack

b. gauze or other absorbent material for packing a wound

3. any substance or material used to make watertight or gastight joints, esp in a stuffing box

4. Engineering pieces of material of various thicknesses used to adjust the position of a component or machine before it is secured in its correct position or alignment

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packing [′pak·iŋ]

(crystallography)

Arrangement of atoms or ions in a crystal lattice.

(engineering)

stuffing

(engineering acoustics)

Excessive crowding of carbon particles in a carbon microphone, produced by excessive pressure or by fusion particles due to excessive current, and causing lowered resistance and sensitivity.

(geology)

The arrangement of solid particles in a sediment or in sedimentary rock.

(graphic arts)

Paper used as a layer under the image or impression cylinder in letterpress printing or under the plate or blanket in lithographic printing in order to produce suitable pressure.

(metallurgy)

In powder metallurgy, a material in which compacts are embedded during presintering or sintering operations.

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packing

1. The stuffing or a thin ring of elastic material around a shaft or valve stem, or around a joint, to prevent fluid leakage.

2. Small stones embedded in mortar; used to fill the cracks between the larger stones.

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Packing 

(in chemical engineering), bodies of various shapes and dimensions that are used to fill the working spaces of equipment such as absorbers and rectification columns to increase the contact surface between a liquid and a gas or vapor, thus achieving increased interaction between the phases, and also to equalize streams, separate sprays, or change the nature of mixing. In absorption and rectification equipment, the liquid coats the packing with a thin film and flows over it. In this case, the size of the packing surface determines the contact surface with the gaseous phase.

Packing is loaded into various types of equipment onto perforated support plates or gratings either by random pouring or in a particular order (regular packings). The latter type of packing leads to lower hydraulic resistance and a higher throughput capacity of the equipment. The most common packing consists of thin-walled rings whose height is equal to their outside diameter. Rings 10–100 mm in diameter are used in most cases. Such rings are produced from chemically stable materials (mainly ceramic and, less frequently, steel rings). In addition to ring packing, other shapes are used—for example, hollow spheres with openings, saddle-shaped articles, spirals, and also packing in the form of stamped metal screens.

REFERENCE

Kasatkin, A. G. Osnovnye protsessy i apparaty khimicheskoi tekhnologii, 8th ed. Moscow, 1971.

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Packing 

a device to prevent or reduce the leakage of liquid or gas through gaps between joined parts. Packings are necessary because uneven areas remain on parts even after the most careful machining, forming gaps where the parts are joined. Packings may be designed for installation between stationary parts, in which case they are usually in the form of elastic washers or gaskets, or they may operate against moving surfaces. In the latter case the seal is achieved by closing the gaps with a filler, lubricant, or putty or by installing a labyrinth packing.