Glossary

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There are 158 names in this directory beginning with the letter P.
PACK
1. The complete assembly of filters and spinneret through which polymer flows during extrusion. 2. A unit of weight for wool, 240 pounds.

PACK LIFE
The time during which a pack assembly can remain in use and produce good quality yarn.

PACKAGE BUILD
general term that applies to the shape, angles, tension, etc., of a yarn package during winding.Package build affects performance during subsequent processing.

PACKAGE DYEING

PACKAGES
A large selection of forms for winding yarn is available to meet the requirements of existing machinery and a variety of package builds is used to ensure suitable unwinding in later stages of manufacturing. Since a package with flanges cannot be unwound easily and quickly by pulling the yarn off over end, most packages are flangeless with self-supporting edges. Some can be unwound at speeds up to 1500 yd/min. The accompanying diagram shows six common types of yarn packages.

PAD DYEING
A form of dyeing whereby a dye solution is applied by means of a padder or mangle. See DYEING

PADDING
The application of a liquor or paste to textiles either by passing the material through a bath and subsequently through squeeze rollers, or by passing it between squeeze rollers, the bottom one of which carries the liquor or paste.

PADDLE DYEING MACHINE
A machine used for dyeing garments, hosiery, and other small pieces that are packaged loosely in mesh bags. The unit consists of an open tank and revolving paddles that circulate the bags in the dye bath.

PAISLEY
A drop-shaped pattern that is extremely popular for men's ties and womenswear.

PANELS (HOSIERY)
Knitted panels used for testing purposes.

PANNE SATIN
A satin fabric with an unusually high luster because of the application of very heavy roll pressure in finishing. Panne satin is made of silk or one of the manufactured fibers.

PANNE VELVET
Velvet of silk or a manufactured fiber, with a finish in which the pile is flattened and laid in one direction. Panne velvet is a lustrous, lightweight fabric.

PAPERMAKERS FELT
Formerly, a heavy, wide, coarse, worsted or woolen fabric that was threaded between the rolls of the paper making machine to form an endless conveyor belt for pulpor wet paper in its passage through the machine. These products are now also made of various constructions, woven and non-woven, of manufactured fibers and mono-filaments.

PARA
A chemical prefix, usually abbreviated p, indicating that two substituents on a benzenering are separated by two carbon atoms.

PARALLELING
The process of aligning fibers to produce a more uniform, smoother, stronger yarn.

PART RUN
A partially filled bobbin that occurs when an end breaks before the completion of adoff cycle. The total weight of yarn normally wound during a cycle is not obtained on the bobbin at the break position. The number of part runs is used as a measure of spinning performance.

PARTIALLY ORIENTED STAPLE
Staple fibers cut from tow that has been drawn less than normal so that only partial longitudinal orientation of the polymer molecules exists.

PARTIALLY ORIENTED YARNS (POY)
Filament yarns in which the draw ratio is less than normal resulting in only partial longitudinal orientation of the polymer molecules. See POY

PATTERN
1. An arrangement of form; a design or decoration such as the design of woven or printed fabrics. 2. A model, guide, or plan used in making things, such as a garment pattern.

PATTERN WHEEL
In a circular-knitting machine, a slotted device for controlling individual needles so that patterns can be knit in the fabric.


PEARL
See PURL

PEAU DE SOIE
A heavyweight, soft satin of silk or manufactured fiber with a fine cross rib and a dull luster. The term is French for 'skin of silk.'

PEBBLE-WEAVE FABRIC
A fabric with an irregular or rough surface texture formed by either a special weave or by the use of highly twisted yarns that shrink when they are wet.

PECE
Post-chlorinated vinyl chloride polymer. The post-chlorination process increases chlorine content form 57% to 64%. The resulting polymer is soluble in acetone and can be wet spun.

PEEL ADHESION
The force required to de-laminate a structure or to separate the surface layer from a substrate. Peel adhesion is the usual measure of the strength of the bond between fiber reinforcements and rubber in tires and other mechanical rubber goods. See BOND STRENGTH

PEELER
In beaming, a defect caused by a portion of an end sticking or remaining on the beam,causing the filament to strip back or peel until it is broken. Although they are often associated with ringers, peelers are not necessarily defects that will circle the beams.

PEGGING
A finishing process for velveteen consisting of applying friction with blocks of wood or soapstone to impart a gloss or sheen to the fabric.

PEGGING JETS
A technique for freeing a plugged hole in a spinneret by rubbing the face with a piece of wood. Use of the technique has been discouraged because of damage to the spinneret.

PELERINE
A device for transferring stitches from the cylinder to the dial or vice versa on a circular-knitting machine.

PERCALE
A closely woven, plain-weave, spun fabric used for dress goods and sheeting, generally 80 x 80 threads per inch or better.

PERCHING
Inspection of cloth for defects while it is run over a roller.

PERMANENT DEFORMATION
The change in length of a sample after removal of an applied tensile stress and after the removal of any internal strain (e.g., by boiling off the sample and allowing it to dry without tension). The permanent deformation is expressed as a percentage of the original sample length.

PERMANENT FINISH
A term for various finishing treatments, chemical and/or mechanical,applied to fabric so that it will retain certain properties, such as glaze of chintz, crispness of organdy, smoothness of cotton table damask, and crease, crush, and shrinkage resistance of many apparel fabrics during the normal period of wear and laundering. See DURABLE PRESS

PERMANENT GROWTH

PERMANENT PRESS

PERMANENT SET

PERMEABILITY
The state or quality of being penetrable by fluids or gases

PERMITTIVITY

pH
Value indicating the acidity or alkalinity of a material. It is the negative logarithm of the effective hydrogen ion concentration. A pH of 7.0 is neutral; less than 7.0 is acidic; and more than 7.0 is basic.

PHASE-SEPARATION SPINNING
Extrusion of polymer and solvent at high temperature into a cooling zone. During the cooling process, a phase separation occurs, usually accompanied by crystallization of the solvent. Solvent can be removed before or after drawing. See SPINNING

PHASES BEAM
A beam on which each of the ends is wound from the same depth of each of the bobbins on the creel. Phased beams are prepared when yarn properties vary from the inside to the outside of the bobbins in order to prevent warp streakiness in the finished fabric.

PHENOLIC
1. A resin or plastic made by the condensation of a phenol with an aldehyde and used particularly in coatings and adhesives. 2. Containing or pertaining to phenol.

PHENYL
chemical radical, (C6H5-), derived from benzene. It is the basis of many aromaticderivatives.

PHOSPHORESCENCE
Emission of light that persists for a noticeable time after the removal of the excitation source. See LUMINESCENCE

PHOSPHORIC ACID
An inorganic acid having the formula (H3PO4).

PHOTOGRAPHIC PRINTING
A method of printing from photoengraved rollers. The resultant design looks like a photograph. The designs may also be photographed on a silk screen which is used in screen printing. See PRINTING

PHTHALIC ACID
An organic acid obtained by oxidation of various benzene derivatives and having two adjacent (ortho) acid (COOH) groups on the benzene ring.

PICK
A single filling thread carried by one trip of the weft-insertion device across the loom.The picks interlace with the warp ends to form a woven fabric. (Also see FILLING .)

PICK COUNT
The number of filling yarns per inch or per centimeter of fabric.

PICK COUNTER
1. A mechanical device that counts the picks as they are inserted during weaving. 2. A mechanical device equipped with a magnifying glass used for counting picks (and/or ends) in finished fabrics.

PICK-OUT MARK
A filling wise band or bar characterized by a chafed or fuzzy appearance due to pulled-out picks. See RIP OUT

PICKER
1. A machine that opens staple fiber and forms a lap for the carding process used in the production of spun yarns. 2. That part of the picking mechanism of the loom that actually strikes the shuttle.

PICKER LAP
A continuous, considerably compressed sheet of staple that is delivered by the picker and wound into a cylindrical package. It is used to feed the card.

PICKER STICKS
The two sticks that throw the shuttles from box to box at each end of the race plate of the loom.

PICKING
1. A process that continues the opening and cleaning of staple and forms a continuous fiber sheet (or lap), which is delivered to the card. 2. The operation of passing the filling through the warp shed during weaving.

PICOT
1. A small loop woven on the edge of ribbon, or a purl on lace. A picot edge may also be produced by a hemstitching machine. 2. A run-resistant loop usually found at the top of hosiery. See PURL

PIECE
A standard length of a fabric, such as 40, 60, 80, or 100 yards.

PIECE DYEING
The dyeing of fabrics 'in the piece' i.e. in fabric form after weaving or knitting as opposed to dyeing in the form of yarn or stock. See DYEING

PIECING
The joining of two or more ends of sliver, roving, yarn, etc.

PIGMENT
An insoluble, finely divided substance, such as titanium dioxide, used to deluster or color fibers, yarns or fabrics.

PIGMENT PRINTING
Printing by the use of pigments instead of dyes. The pigments do not penetrate the fiber but are affixed to the surface of the fabric by means of synthetic resins which are cured after application to make them insoluble. The pigments are insoluble, and application is in the form of water-in-oil or oil-in-water emulsions of pigment pastes and resins. The colors produced are bright and generally fat except to crocking. See PRINTING

PIGMENTED YARN
A dull or colored yarn spun from a solution or melt containing a pigment. Also see DYEING MASS-COLOURED

PILE
1. A fabric effect formed by introducing tufts, loops, or other erect yarns on all or part of the fabric surface. Types are warp, filling, and knotted pile, or loops produced by weaving an extra set of yarns over wires that are then drawn out of the fabric. Plain wires leave uncut loops; wires with a razor-like blade produce a cut-pile surface. Pile fabric can also be made by producing a double-cloth structure woven face to face, with an extra set of yarn interlacing with each cloth alternately. The two fabrics are cut apart by a traversing knife, producing two fabrics with a cut-pile face. Pile should not be confused with nap. Corduroys are another type of pile fabric, where long filling floats on the surface are slit, causing the pile to stand erect. 2. In carpets, pile refers to the face yarn, as opposed to backing or support yarn. Pile carpets are produced by either tufting or weaving. Also see CUT PILE LOOP PILE WARP PILE

PILE CRUSH
The bending of upholstery or carpet pile that results from heavy use or the pressure of furniture.

PILE WEAVE
A weave in which an additional set of yarns, either warp or filling, floats on the surface and is cut to form the pile. Turkish toweling is a pile weave fabric with uncut loops on one or both sides.

PILE WIRE
A metal rod over which yarn is woven to generate a pile fabric.

PILL
A small accumulation of fibers on the surface of a fabric.Pills, which can develop during wear, are held to the fabric by an entanglement with surface fibers of the material, and are usually composed of the same fibers from which the fabric is made.

PILLING
The tendency of fibers to work loose from a fabric surface and form balled or matted particles of fiber that remain attached to the surface of the fabric.

PILOT
A woolen cloth generally made in navy blue and used for seamens coats. It is usually a heavily milled 2/2 twill with a raised, brushed finish.

PIN DRAFTING
Any system of drafting in which the orientation of the fibers relative to one another in the sliver is controlled by pins. See GILLING PINNING

PIN MARK

PINHEAD
A small pinhead-sized opening usually found about 10 to 12 inches from a selvage. Pinheads usually run in a fairly straight line along the warp and are formed by the shuttle pinching the filling, causing small kinks that show up as small holes in transmitted light.

PINHOLE
A very small hole in hosiery or fabric. See SPREAD STITCH CROSS-STITCH FISH EYE CAT EYE

PINION BARRE
A fine, filling wise fabric defect appearing as one or two pick bars in an even repeat. It is caused by a faulty loom pinion.

PINNING

PINSONIC THERMAL JOINING MACHINE
A rapid, efficient quilting machine that uses ultrasonic energy rather than conventional stitching techniques to join layers of thermoplastic materials. The ultrasonic vibrations generate localized heat by causing one piece of material to vibrate against the other at extremely high speed, resulting in a series of welds that fuse the materials together. See ULTRASONIC QUILTING ULTRASONIC QUILTING

PIQUE
1. A medium weight to heavyweight fabric with raised cords in the warp direction. 2. A double-knit fabric construction knit on multi-feed circular machines.

PIRN
1. A wood, paper, or plastic support, cylindrical or slightly tapered, with or without aconical base, on which yarn is wound. 2. The double-tapered take-up yarn package from draw-twisting of nylon, polyester, and other melt spun yarns.

PIRN BARRE
A fabric defect consisting of crosswise bars caused by unequal shrinkage of the filling yarn from different points on the original yarn package.

PITCH
In pile floor covering, the average number of pile ends per inch in the filling-wise direction.

PLAIN WEAVE
One of the three fundamental weaves: plain, satin,and twill. Each filling yarn passes successively over and under each warp yarn, alternating each row. See WEAVE

PLAIN-KNIT FABRIC

PLAITING

PLASTIC
A high polymer, usually combined with other ingredients such as curatives, plasticizers and fillers. It can be molded under heat and pressure and then machined accurately inits hardened state. General term for a wide range of substances.

PLASTICIZER
1. A chemical added to polymers and resins to impart flexibility, work ability or stretch ability. 2. A bonding agent that acts by solvent action on fibers.

PLATED
1. A term to describe a fabric that is produced from two yarns of different colors,characters, or qualities, one of which appears on the face and the other on the back. 2. A term to describe a yarn covered by another yarn.

PLEAT
Three layers of fabric involving two folds or reversals of direction; the back fold maybe replaced by a seam.

PLIED YARN
A yarn formed by twisting together two or more singles yarns in one operation. See FOLDED YARN

PLIED YARN DUCK
See DUCK

PLISSE
A cotton, rayon, or acetate fabric with a crinkled or pleated effect. The effect is produced by treating the fabric, in a striped or spotted motif, with a caustic-soda solution which shrinks parts of the goods.

PLUCKING
A condition found at the feed roll and lickerin section of the card when larger than normal clusters of fiber are pulled from the lap by the lickerin. This situation is normally caused by uneven laps or the inability of the feed rolls to hold the lap sheet while small clusters of fibers are being pulled from the lap by the lickerin. Plucking inevitably produces flaky webs.

PLUGGING VALUE
In the manufacture of acetate fibers, a measure of filter ability. It is the weight of solids in an acetate dope that can be passed through a fixed area of filter before the filter becomes plugged. It is expressed as weight of solids per square unit of filter area, e.g. g/cm2.

PLUSH
A term describing a cut-pile carpet in which the pile yarns are only slightly twisted,dense, and very evenly sheared. A plush carpet has the look of a solid, flat velvet surface.Similar pile constructions are also used in upholstery fabric.

PLY
1. The number of singles yarns twisted together to form a plied yarn, or the number of plied yarns twisted together to form cord. 2. An individual yarn in a plied yarn or cord. 3. One of a number of layers of fabric (ASTM). 4. The number of layers of fabric, as in a shirt collar or of cord in a tire.

PLY TWISTING
See PLYING

PLYFIL
proprietary system of making two-fold long-and-short staple yarns by using ultra-high drafting. The slightly twisted ends produced are not use able yarns but are well suited for subsequent processing, i.e., twisting.

PLYING
Twisting together two or more singles yarns or ply yarns to form, respectively, ply yarn or cord. See PLY TWISTING

POINT BONDING
The process of binding thermoplastic fibers into a non-woven fabric by applying heat and pressure so that a discrete pattern of fiber bonds is formed. Also called spot bonding. See BONDING

POLYAMIDE
A synthetic polymer and the fibers made from it in which the simple chemical compounds used for its production are linked together by amide linkages (-NH-CO-). Also see NYLON FIBER

POLYARYLATE
High-temperature-resistant aromatic polyesters from bisphenols.

POLYBENZIMIDAZOLE FIBER (PBI)
A manufactured fiber in which the fiber-forming substance is a long chain aromatic polymer having recurrent imidazole groups as an integral part of the polymer chain. (FTC definition). The polymer is made from tetraaminobiphenyl and diphenyl isophthalate and is dry spun from adope with dimethylacetamide as a solvent. See PBI

POLYBLENDS

POLYCHLAL FIBER
A manufactured, bicomponent fiber of polyvinyl alcohol and polyvinylchloride. Some vinyl chloride is grafted to the polyvinyl alcohol (Japanese Chemical Fibers Association definition). The fiber is emulsion spun into tow and staple.

POLYESTER FIBER
A manufactured fiber in which the fiber-forming substance is any long chain synthetic polymer composed of at least 85% by weight of an ester of dihydric alcohol and terephthalic acid (FTC definition). The polymer is produced by the reaction of ethylene glycol and terephthalic acid or its derivatives. Fiber forms produced are filament, staple, and tow. The process of production resembles that of nylon. Polymerization is accomplished at a high temperature, using a vacuum by one of two methods. (1) The glycoland a terephthalate ester react to form a polymer chain, releasing methanol; or (2) the glycol and terephthalic acid react directly to form the polymer with water as the by-product. As with nylon, the filaments are spun in a melt-spinning process, then stretched several times their original length, which orients the long chain molecules and gives the fiber strength.

POLYETHERIMIDE FIBER (PEI)
A manufactured fiber spun from polyetherimide polymer having high temperature resistance, excellent processibility, and toughness. Used for matrix materials in composites and in other industrial applications.

POLYETHERSULFONE FIBER (PES)
High molecular weight fibers from polymerscontaining sulfone (-SO2-) groups and aromatic nuclei. They demonstrate high thermal stability and chemical inertness.

POLYETHYLENE FIBER
A manufactured fiber made of polyethylene, often in monofilament form as well as continuous filament yarns and staple. Ethylene is polymerized at high pressures and the resulting polymer is melt spun and cold drawn. It may also be dry-spun from xylenesolution. See OLEFIN FIBER

POLYIMIDE FIBER
Fully imidized, manufactured fiber formed from the condensation polymer of an aromatic dianhydride and an aromatic disocyanate. The fiber is produced by dry spinning. It is a high-shrinkage fiber used in the formation of mechanically stable nonwoven fabrics. These fabrics are made without binders or resins; bonding apparently results from the local temperature and pressure that develop during shrinkage.

POLYMER
A high molecular weight, chain-like structure from which manufactured fibers are derived; produced by linking together molecular units called monomers.

POLYMERIZATION
A chemical reaction wherein small molecules combine to form much larger molecules. Also see ADDITION POLYMERIZATION CONDENSATION POLYMERIZATION

POLYMERIZE
To undergo polymerization. To react molecules resulting in their combining and forming relatively long-chain, large molecules.

POLYNOSIC FIBER
A high-wet-modulus rayon staple having a microfibrillar structure offibers. The molecular chain length of the cellulose forming the fiber is about twice as long as inconventional rayon.

POLYOLEFIN FIBER
A fiber produced from a polymerized olefin, such as polypropylene or polyethylene.

POLYOXYAMIDE FIBER
Copolymeric fiber with good comfort properties, particularly high moisture absorption and transfer, and intrinsic softness.

POLYPROPYLENE FIBER
A manufactured, olefin fiber made from polymers or copolymers of propylene. Polypropylene fiber is produced by melt spinning the molten polymer, followed by stretching to orient the fiber molecules. See OLEFIN FIBER

POLYTETRAFLUOROETHYLENE FIBER (PTFE)
Fluorine-containing manufactured fibers characterized by high chemical stability, relative inertness, and high melting point. Made by emulsion spinning, a process that essentially results in fusion of fibrils by passing an emulsion through a capillary, then drawing the resulting fiber. The fiber has a moderate tensile strength and is particularly resistant to the effect of high temperatures and corrosive chemicals. Having very low frictional coefficients, it has a slippery hand. Its principal uses are in packaging and filtration media. See TETRAFLUOROETHYLENE FIBER

POLYURETHANE FIBER

POLYVINYL ALCOHOL
A colorless, water-soluble resin made by the hydrolysis of apoly vinyl ester (usually the acetate). Polyvinyl alcohol is used in textile processing as a size,frequently for nylon, and in fiber manufacture as a raw material for the production of polyvinyl alcohol fibers.

POLYVINYL ALCOHOL FIBER
A manufactured textile fiber developed in Japan. It is made by dissolving polyvinyl alcohol in hot water and extruding this solution through a spinneret into a sodium sulfate coagulating bath. In Japan, the fiber is used in apparel, household, and industrial fabrics.

PONGEE
1. A thin, naturally tan-colored silk fabric with a knotty, rough weave. 2. A cotton fabric made from yarns spun from fine-combed staple and finished with a high luster. This fabric is used for underwear. 3. Fabrics like cotton pongee made from manufactured fibers.

PONTE DI ROMA
A common double-knit fabric construction with a four-feed repeat produced with the dial and cylinder needles in interlock gaiting. The fabric is plain and looks the same on both sides.

POPCORN
1. A special-effect yarn containing short, thick spots. 2. In polymer manufacture a term used to describe oversize, deformed chip.

POPLIN
A plain-weave fabric of various fibers characterized by a rib effect in the filling direction.

POROSITY
The ratio of the volume of air or void contained within the boundaries of a material to the total volume (solid matter plus air or void) expressed as a percentage.

POT SPINNING
A method formerly used for making viscose rayon. The newly spun yarn was delivered into the center of a rapidly rotating, centrifugal pot, where it received twist and centrifugal force caused it to go to the wall of the pot. The yarn package so formed was called a cake. See BUCKET SPINNING CENTRIFUGAL POT

POTASH
A common name for potassium or potassium compounds. Generally used to mean potassium carbonate.

POWDER-BONDED NONWOVEN
A manufactured product in which a carded web is produced and treated with a thermoplastic powder that has a melting point less than that of the fiber in the web. The powder is heated to its melting point by through-air and infrared heating orby hot-calendering to effect bonding. See THERMOBONDING

POWER FACTOR
Of an insulating material, the ratio of the power in watts dissipated in a capacitor in which the material is dielectric, to the product of the sinusoidal voltage and current expressed in effective volt-amperes.


PRECONDITIONING
Bringing a sample or specimen of textile material to a relatively low moisture content (approximate equilibrium in an atmosphere between 5 and 25% relative humidity) prior to conditioning in a controlled atmosphere of higher humidity for testing. (While preconditioning is frequently translated as pre-drying, specimens should not be brought to the over-dry state.)

PREFORM
1. Fabrics that have been stacked in multiple layers and bonded with a stitching yarn or by other means. The preform may be cut into a shape for subsequent molding into a composite part. 2. A preshaped non-woven made by distributing fibers over a screen in the approximate contour of the finished part. 3. A preshaped, three-dimensional reinforcement madevia braiding, weaving, or knitting or some combination of these. 4. A formed but not fully consolidated stack of prepreg layers which have the contour of the finished product. 5. The first stage in the production of blow-molded products such as PET bottles.

PREMETALLIZED DYES
Acid dyes that are treated with coordinating metals such as chromium. This type of dye has much better wet-fastness than regular acid dye. Premetallized dyes are used on nylon, silk, and wool. See DYES

PREOXIDIZED FIBER
In carbon fiber production, a fiber that results from a relatively low temperature (200-500?C) heat treatment in the presence of oxygen which converts the precursor fiber, PAN or rayon, to an in-fusible fiber that is stable to further processing.

PREPREG
Ready-to-mold, reinforcing material, either fiber, fabric, or mat, that is fully impregnated with resin and in some cases, partially cured. Prepregs are then used by fabricators in laying-up and molding composites after which curing is completed.

PRESSLEY INDEX
A measure of the strength of fiber bundles determined under prescribed conditions and expressed in an arbitrary unit, pounds per milligram.

PRESSURE DROP
1. A decrease in pressure that is caused by friction between a flowing liquid and a constricting container. The pressure drop is increased by a reduction in diameter of the container. 2. The change in pressure across a filter.

PRESSURE DYEING
Dyeing by means of forced circulation of dye through packages of fiber, yarn, or fabric under super atmospheric pressure. See DYEING

PRESSURE MARK

PRETENSION
The relatively low tension applied to remove kinks and crimp when mounting a specimen preparatory to making a test or to a textile processing operation, etc.

PRIMARY BACKING
The material, usually woven or nonwoven polypropylene or jute, into which a carpet is tufted. The primary backing allows the positioning of each tuft and holds the tufts in position during processing, after which a secondary backing (q.v.) is applied to provided imensional stability.

PRIMARY COLORS
Magenta, yellow, and cyan (red, yellow, blue); these are the subtractive primaries used when mixing dyes, paints, etc., to make all other colors. In the CIE (Commission Internationale de leclairage) system of color measurement, which is the international system most widely used today, the primary color vectors are red, green, and blue-violet. These are additive primaries based on the perception of color of reflected light by the human eye.

PRIMARY CREEP
The recoverable component of creep. Also see DELAYED DEFORMATION

PRINT
A fabric with designs applied by means of dyes or pigments used on engraved rollers,blocks, or screens. Also see PRINTING

PRINT BONDING
A process of binding fibers into a non-woven fabric by applying an adhesive in a discrete pattern. See BONDING

PRINT PASTE
The mixture of gum or thickener, dye, and appropriate chemicals used in printing fabrics. Viscosity varies according to the types of printing equipment, the type of cloth, the degree of penetration desired etc.

PRINTCLOTH
A medium-weight, plain-weave fabric made of carded yarns, usually cotton or polyester/cotton blends, with counts from 28s to 42s. Millions of yards of print cloth are printed annually and other millions are finished as white goods. Large amounts of the goods are also used in the greige for bags, containers, and base fabric for coated materials.

PRINTING
A process for producing a pattern on yarns, warp, fabric, or carpet by any of a large number of printing methods. The color or other treating material, usually in the form of a paste,is deposited onto the fabric which is then usually treated with steam, heat, or chemicals for fixation. Various types of printing are BLOCK PRINTING , BLOTCH PRINTING , BURN-OUT PRINTING , DIRECT PRINTING , DISCHARGE PRINTING , DUPLEX PRINTING , ETCHING , EXTRACT PRINTINGS , HEAT TRANSFER PRINTING , INK-JET PRINTING , PHOTOGRAPHIC PRINTING , PIGMENT PRINTING , RESIST PRINTING , ROLLER PRINTING , ROTARY SCREEN PRINTING , SCREEN PRINTING , WARP PRINTING , SUBLISTATIC PROCESS , HAND-BLOCKED PRINT , CYLINDER, SCREEN

PRODUCER TWIST
Small amounts of twist, usually a half turn per inch or less, applied to yarns by the manufacturer to provide cohesion of filaments for further processing.

PRODUCER-COLORED

PRODUCER-TEXTURED YARNS
Continuous filament yarns that have been bulked during manufacturing by the fiber producer. Also see TEXTURING

PROJECTILE LOOM
A shuttle-less loom that uses small, bullet-like projectiles to carry the filling yarn through the shed. Fill is inserted from the same side of the loom for each pick. A tucked selvage is formed. Also see WEFT INSERTION

PUCKER
Uneven surface caused by differential shrinkage of the yarns in a fabric or differential shrinkage of the fabric and sewing thread. May be desirable and planned or undesirable.

PULLED-IN FILLING
An extra thread dragged into the shed with the regular pick and extending only a part of the way across the fabric. See DRAGGED-IN FILLING , WHIPPED-IN FILLING , JERKED-IN FILLING , LASHED-IN FILLING , JERK-BACK

PULP
The end product of cooking wood chips, cotton, or some source of cellulose with water and appropriate chemicals. Used in the manufacture of cellulosic fibers, paper, and other cellulose-based products.

PULTRUSION
The production of continuous lengths of fiber-reinforced advanced composites.Fibers are fed as roving, fabric, or mat, or some combination of these, through a resin impregnation process, to a forming guide, then to a heated die to produce a specific shape, and finally to a puller where the structure is pulled through different forming and cooling stages.Thermoplastic fibers may be substituted for the resin in the pultrusion process.

PURL
1. A knitting stitch that results in horizontal ridges across the fabric. It is made by drawing alternate courses through each side of the fabric. 2. A picotor small loop that edges needlework, lace, or ribbon. Sometimes spelled pearl. (Also see PICOT.) 3. Coiled gold or silver thread used for embroidery. See LINK-AND-LINK , BACKSTITCH , PEARL

PYROLYSIS
A chemical change brought about by the action of heat, usually in the absence of a reactive medium. Complex chemical molecules are reduced to simpler chemical units as a result of pyrolysis.


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