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U.S. Department of Labor
Industry: Government; Labor
Number of terms: 77176
Number of blossaries: 0
Company Profile:
A professional who sets up and adjusts battery of automatic machines that compress powdered plastics into tablets used in molding plastic buttons. Respnsibilities include: * Installs specified dies and punches onto machine holder plate according to tablet size specifications, using wrench. * Adjusts stroke of punch according to tablet density specifications. * Starts battery of automatic machines that compress powdered plastics into tablets. * Breaks sample tablets between fingers to test hardness. * Weighs sample lot of tablets to verify density. * Adjusts machine controls to eliminate tablet defects.
Industry:Professional careers
A professional who sets up and operates injection-molding machines to cast products from thermoplastic materials. Respnsibilities include: * Installs dies on machine, according to work order specifications, using clamps, bolts, and handtools. * Sets machine controls, regulating molding temperature, volume of plastic, molding pressure and time, according to knowledge of plastics and molding procedures. * Dumps premixed plastic powders or pellets into hopper, and starts machine. * Pulls lever to close dies and inject plastic into dies to cast part. * Removes finished product from dies, using handtools. * Trims excess material from part, using knife. * May mix thermoplastic materials and coloring pigments in mixing machine, according to formula. * May grind scrap plastic into powder for reuse.
Industry:Professional careers
A professional who operates preexpander and continuous molding machine that expands and molds polystyrene beads under heat and pressure, forming bead board. Respnsibilities include: * Reads work order to determine resin type and density requirements for bead board production. * Shoves intake tube in resin and presses tube into coupling of venturi feed system. * Presses buttons and turns valves to activate centrifuge, supply steam, and feed resin to expander. * Fills volumetric can with beads and weighs beads to determine density, using balance scale. * Compares bead density with production requirements. * Reads steam pressure and temperature gauges and turns steam valve or rotates auger disk, adjusting heat and resin feed rate to control bead density. * Connects hose of molder feed hopper to aging bin and pushes feed hopper into place to feed molding machine. * Turns venturi feed valve, sending air through feeder to draw beads from hopper into molder. * Starts molding machine. * Guides bead board from molder through rollers of trimmer and saw to start board. * Monitors gauges and observes operation of molding machine and equipment to ensure operation according to specifications. * Inspects bead board for specified fusion and finish. * Turns steam and air valves to adjust heat and bead feed rate to prevent machine overload and to correct flaws in bead board. * Records lot number of resin, feed rate, and steam pressure, for various densities and board dimensions. * Computes production in board feet to determine output.
Industry:Professional careers
A professional who tends machine that casts plastic containers. Respnsibilities include: * Fills tubs with prescribed amounts of colored thermoplastic powder and zinc compound, using scoop and scale. * Positions tubs containing mixture to facilitate loading of molds. * Fills molds with specified amount of mixture, closes mold covers, and depresses toggle latches to lock covers in place. * Presses buttons to start centrifugal-casting machine that automatically heats, spreads, hardens, and shapes mixture into plastic molds to form refuse containers. * Pulls toggle latches to release mold covers and removes covers. * Breaks seals that hold plastic containers in molds and removes containers from molds, using handtool. * Wipes moisture from inside of molds, using cloth rag. * Trims flashing (excess plastic) from containers, using utility knife.
Industry:Professional careers
A professional who molds imitation marble (scagliola) into objects, such as desk sets, penholders, sections of pillars, and interior decorative slabs. Respnsibilities include: * Compounds materials in vat according to formula. * Pours mixture into molds or on glass-flanged table. * Dumps set pieces out of molds. * Smooths objects with brick covered with moist emery, rottenstone, or other abrasive. * Polishes parts with felt-covered brick. * May use acetic acid solution to increase polishing quality of felt and add to luster of polished surface.
Industry:Professional careers
A professional who molds imitation marble (scagliola) into objects, such as desk sets, penholders, sections of pillars, and interior decorative slabs. Respnsibilities include: * Compounds materials in vat according to formula. * Pours mixture into molds or on glass-flanged table. * Dumps set pieces out of molds. * Smooths objects with brick covered with moist emery, rottenstone, or other abrasive. * Polishes parts with felt-covered brick. * May use acetic acid solution to increase polishing quality of felt and add to luster of polished surface.
Industry:Professional careers
A professional who operates hydraulic press, equipped with steam or electrically heated platens, to cast rubber or plastic matrices and rubber dies or types. Respnsibilities include: * Turns dial to set electric thermostat or steam valves to maintain specified temperature in press. * Inserts chase containing type into press to heat type to specified temperature, or inserts engraved metal plate into press. * Places sheet of hard plastic or similar material on type and allows to heat for prescribed period of time. * Pulls lever to impress material into type form to make matrix. * Peels matrix from type, places rubber of plastic sheet on matrix and inserts it in press. * Places metal strips (bearers) of specified thickness along sides of rubber or plastic and matrix to limit depth of pressing and determine thickness of die. * Repeats heating and casting process to produce rubber die. * Trims excess rubber from edges of designs, letters, symbols, and figures, using curved knife. * May mix casting compound and water to puttylike consistency, spread compound on mold plate, invert casting plate over type, press compound into type and dry compound in oven. * When making rubber dies or type, may be known as Vulcanizer, Rubber Plate.
Industry:Professional careers
A professional who tends equipment that forces viscose fluid between two adjustable metal bars and into acid bath that coagulates fluid into continuous sheet of cellophane. Respnsibilities include: * Reads gauges and observes image on video display screen to ascertain thickness and uniformity of cellophane sheet. * Turns clamp nuts, using wrench, to adjust bar gap to produce sheet of specified thickness and uniformity. * Turns valves and starts pumps to regulate flow of viscose. * Maintains log of operating conditions and output of casting machine.
Industry:Professional careers
A professional who tends equipment that forces viscose fluid between two adjustable metal bars and into acid bath that coagulates fluid into continuous sheet of cellophane. Respnsibilities include: * Reads gauges and observes image on video display screen to ascertain thickness and uniformity of cellophane sheet. * Turns clamp nuts, using wrench, to adjust bar gap to produce sheet of specified thickness and uniformity. * Turns valves and starts pumps to regulate flow of viscose. * Maintains log of operating conditions and output of casting machine.
Industry:Professional careers
A professional who tends steam oven that heats liquid plastics in glass molds (cells) to form sheets. Respnsibilities include: * Examines and removes defective molds from handtrucks. * Loads trucks holding molds into ovens and records time molds entered ovens. * Turns steam and cold-air valves to maintain specified pressure and temperature in oven. * Inserts knife into baked sheet or feels sheet to determine that sheet is baked to specifications.
Industry:Professional careers