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| Panel products |
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A descriptor that generally includes some or all of the following: plywood, waferboard and oriented strandboard, hardboard, insulation board, and composites using these materials.
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| Panel stock |
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Stock panels which are 4’ wide and 8’ long. Therefore, the gross length of the veneer required for these panels is at least 98” to 100”. It may include 9’ and 10’ lengths.
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| Paper |
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Generally, a matted or felted sheet of vegetable fiber, formed on a screen from a water suspension, used for writing and printing as well as for wrapping and many other purposes. Paper is one of two broad subdivisions of the general term, papers; the other is paperboard.
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| Paper wrap |
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Material used to wrap loads of finished lumber to protect it from weather and damage. Normally also display company name and logo.
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| Paperboard |
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A general term describing sheets made of fibrous material 0.012 inch or more in thickness. Compared with paper, paperboard is heavier per unit area, thicker, and more rigid. Paperboard is the term used to describe any single variety, or group of varieties, of board materials used in the production of boxes, folding cartons, and solid fiber and corrugated shipping containers.
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| Parallam |
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Parallel strand lumber (PSL). A composite wood product where veneers are clipped into 1" strips and pressed together (all grain parallel) into a large billet. Billets are cut into different sizes for high strength beam and column applications. The attractive material may be left exposed. CCA treated PSL is also available for exterior use.
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| Parallel strand lumber (PSL) |
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A structural wood product made by gluing together long strands of wood that have been cut from softwood veneer.
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| Particleboard |
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A generic term for a material manufactured from wood particles or other lignocellulosic material and a synthetic resin or suitable binder.
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| Particleboard, extruded |
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Made by ramming binder-coated particles into a heated die, which subsequently cure the binder and forms a rigid mass as the material is moved through the die.
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| Particleboard, mat-formed |
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Particles (being previously coated with the binding agent) are formed into a mat having substantially the same length and width as the finished panel. This mat is then pressed in a heated flat-platen press to cure the binding agent.
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| Particleboard, Mende-process |
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Made in a continuous ribbon from wood particles with thermosetting resins used to bond the particles. Thickness ranges from 1/32 to 1/4 inch.
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| Particleboard, multilayer |
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Wood particles are made or classified into different sizes and placed into the preprocessed panel configuration to produce a panel with specific properties. Panels destined for primarily nonstructural uses requiring smooth faces are configured with small particles on the outside and coarser particles on the interior (core). Panels designed for structural application may have flakes aligned in orthogonal directions in various layers which mimic the structure of plywood. Three- and five-layer constructions are most common.
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| Pascal (Pa) |
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A unit of pressure or stress equal to one newton per square metre.
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| Peel |
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To convert a log into veneer by rotary cutting.
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| Peeler |
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Logs used for peeling into thin layers called veneer for the manufacture of plywood.
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| Pentachlorophenol (penta) |
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A chemical used in wood preserving; it is usually applied under pressure so that it will penetrate the wood.
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| Photocell |
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Device used to detect the presence of an object. A photocell is composed of a transmitter, which transmits an infrared signal to a receiver or reflector.
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| Photosynthesis |
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A process that plants use to synthesize nutrients from water and minerals using sunlight.
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| Pile |
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A long, heavy timber, round or square, driven deep into the ground to provide a secure foundation for structures built on soft, wet, or submerged sites (e.g., landing stages, bridge abutments).
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| Pilot pressure |
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Auxiliary pressure used to actuate or control hydraulic components.
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| Pilot valve |
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An auxiliary valve used to control the operation of another valve. The controlling stage of a 2-stage valve.
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| Piston |
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A cylindrically shaped part which fits within a cylinder and transmits or receives motion by means of a connecting rod.
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| Pitch |
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Accumulation of resin in the wood. This causes resistance moisture meters to read high.
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| Pitch pocket |
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An opening between growth rings which usually contains or has contained resin or bark or both.
View: Pitch/Bark Pocket
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| Pith |
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The small cylinder of primary tissue of a tree stem around which the annual rings form; the center of a tree.
View: Pith
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| Planer |
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Machine centre used to process rough lumber into a finished product, leaving it smooth and uniform in size.
View: Planer Examples
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| Planer mill |
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Although sometimes a separate facility, the planer mill is usually that part of a sawmill where lumber is planed, graded, and sorted.
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| Planer shavings |
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The residue obtained when a piece of wood is surfaced by a planer.
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| Planing allowance |
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The quantity of wood, normally expressed in thousandths of an inch, that is set to be removed by a planer during surfacing.
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| Platform frame construction |
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The type of construction most often used in home building in which the floor joists are completed first and completely covered with a sub-flooring to form a platform upon which exterior walls and interior partitions are erected.
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| PLC |
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Programmable logic controllers. Industrial computer with I/O capability, which programs in ladder-relay logic.
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| Plenum baffle |
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A fixed or adjustable baffle suspended in the plenum chamber of a dry kiln designed to split and direct airflow top to bottom through the lumber load.
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| Plenum chamber |
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The space between the lumber and the outside walls of a dry kiln.
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| Plumb |
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Straight up and down, perfectly vertical.
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| Plunger |
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A cylindrically shaped part which has only one diameter and is used to transmit thrust. A ram.
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| Ply |
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A single sheet of veneer forming one layer in a multi-layered piece of plywood.
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| Plywood |
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A glued wood panel made up of relatively thin layers of veneer with the grain of adjacent layers at right angles, or of veneer in combination with a core of lumber or of reconstituted wood. The usual constructions have an odd number of layers.
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| Plywood, cold-pressed |
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Refers to interior-type plywood manufactured in a press without external applications of heat.
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| Plywood, exterior |
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A general term for plywood bonded with a type of adhesive that by systematic tests and service records has proved highly resistant to weather; microorganisms; cold, hot, and boiling water; steam; and dry heat.
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| Plywood, interior |
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A general term for plywood manufactured for indoor use or in construction subjected to only temporary moisture. The adhesive used may be interior, intermediate, or exterior.
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| Plywood, marine |
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Plywood panels manufactured with the same glueline durability requirements as other exterior-type panels but with more restrictive veneer quality requirements.
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| Plywood, molded |
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Plywood that is glued to the desired shape either between curved forms or more commonly by fluid pressure applied with flexible bags or blankets (bag molding) or other means.
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| Plywood, postformed |
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The product formed when flat plywood is reshaped into a curved configuration by steaming or plasticizing agents.
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| Pneumatic |
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To move or convey an object by air pressure.
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| Poly under top tier (PUTT) |
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A way of giving some protection to unitized lumber by the insertion of a piece of plastic between the next-to-top and top tiers.
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| Poppet |
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That part of certain valves which prevents flow when it closes against a seat.
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| Port |
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An internal or external terminus of a passage in a component.
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| Positive displacement |
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A characteristic of a pump or motor which has the inlet positively sealed from the outlet so that fluid cannot recirculate in the component.
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| Potentiometer |
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A control element in the servo system which measures and controls electrical potential.
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| Pound (lb) |
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A unit of weight equal to 16 ounces (0.45 kilograms).
View: Metric / Imperial Conversion
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| Powder-post damage |
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Small holes (1/16" to 1/12" in diameter) filled with dry, crumbled wood, resulting from the work of beetles (mostly Lyctus) in seasoned and unseasoned wood.
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| Power |
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Work per unit of time. Measured in horsepower (hp) or watts (W).
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| Power boiler |
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A boiler that uses wood waste and natural gas as fuel to produce process steam.
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| Power cut |
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The circular saw blade rotates in the same direction as the material is fed during the cutting process.
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| Power pack |
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An integral power supply unit usually containing a pump, reservoir, relief valve and directional control.
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| Precharge pressure |
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The pressure of compressed gas in an accumulator prior to the admission of liquid.
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| Precision end trimmed (PET) |
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Lumber trimmed smooth on both ends and varying no more than 1/16" in nor more than 20% of the pieces. May be a condition of sale.
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| Prefabricated housing |
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Housing units partially or completely built in a factory.
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| Preprinted linerboard |
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Linerboard that is printed before being sent to a box plant for manufacture into a corrugated container.
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| Preservative |
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Any substance that, for a reasonable length of time, is effective in preventing the development and action of wood-rotting fungi, borers of various kinds, and harmful insects that deteriorate wood.
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| Pressure |
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Force per unit area. Usually measured in pounds per square inch (PSI) or kilopascals (kPa). A kilopascal is equal to 1000 newtons per square metre or 0.0102 kg/sq cm (0.145 lb/sq in).
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| Pressure drop |
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The difference in pressure between any two points of a system or a component.
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| Pressure line |
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The line carrying the fluid from the pump outlet to the pressurized port of the actuator.
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| Pressure override |
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The difference between the cracking pressure of a valve and the pressure reached when the valve is passing full flow.
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| Pressure plate |
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A side plate in a vane pump or motor cartridge on the pressure port side.
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| Pressure reducing valve |
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A valve which limits the maximum pressure at its outlet regardless of the inlet pressure.
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| Pressure switch |
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1. An electric switch operated by fluid pressure.
2. Switches that read the available pressure in air and hydraulic lines. These switches are
often used as a safety feature, to prevent equipment from operating when there is not enough
air pressure or hydraulic fluid pressure.
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| Pressure treating |
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A process of impregnating lumber or other wood products with various chemicals, such as preservatives and fire retardants, by forcing the chemicals into the structure of the wood using high pressure.
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| Proportional flow |
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In a filter, the condition where part of the flow passes through the filter element in proportion to pressure drop.
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| Proximity switch |
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Photoelectric switches that are triggered as a piece passes near them. Proximity switches are used to detect the presence or absence of material.
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| PSI |
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Pounds per square inch.
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| Pulp logs |
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Logs of lesser value (smaller in diameter with acceptable defects) than sawlogs, of greater value than cordwood. Pulp logs are usually bought by the ton to be debarked, reduced to chips, and used to manufacture pulp and paper.
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| Pulpwood |
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Small timber bucked to length (can be longwood or shortwood lengths) for use as a fiber source in a pulpmill.
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| Pulse generator |
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Device attached to a moving chain that produces an electrical signal each time the chain moves a fixed distance. The pulse generator is attached to the chain and used to track the movement of the pieces through a scanner.
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| Pump |
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A device which converts mechanical force and motion into hydraulic fluid power.
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