PSE 201 Final Exam

PSE 201 Final ExamPSE 201 Final Exam In this piece of equipment, thick stock is mixed with white water to form thin stock for the headbox of the paper machine a. Saveall b. Manifold c. Dilution chest d. Deculator e. Fan pump Correct answer- e. Fan Pump In stock preparation, refining is required to improve sheet/board ___________ a. Caliper b. Basis weight c. Density d. Strength e. Yield Correct answer- d. Strength If a paper machine's headbox approach system features centrifugal cleaners, what device might be employed to remove air entrained in the cleaner accepts? a. De-mister b. Hoover c. Deculator d. Screen e. Attenuator Correct answer- c. Deculator Why are table rolls not used on modern, high-speed paper machines? a. Create too much micro-turbulence b. Too slow c. Can't be made wide enough d. Corrode too easily e. Not enough suction Correct answer- a. Create too much micro-turbulence For conventional roll presses, what problem makes it necessary to have multiple nips/stages? a. Over-heating b. Space c. Cost d. Crushing e. Basis weight variations Correct answer- d. Crushing This is the most common type of freeness test used in North America a. Canadian Standard b. TAPPI drainage c. MLS d. Schopper-Riegler e. Drainiac Correct answer- a. Canadian Standard In the stock prep area, consistency must be measured accurately and controlled well in order to achieve what critical sheet property? a. Basis weight b. Density c. Bulk d. Tensile breaking length e. Width Correct answer- a. Basis weight What are the three main types of paper machines? a. single-wire, twin-wire, multi-wire b. gravity, compression, gap c. fourdrinier, top-wire, gap d. incline, horizontal, hybrid Correct answer- c. fourdrinier, top-wire, gap A paper machine with one forming wire is called a ____________ a. Fourdrinier b. Robert c. Donkin d. Bottom former Correct answer- a. Fourdrinier What term is used to describe the fur-like structures on the fiber surface after refining? a. Fibrillation b. Sueding c. Spleening d. Cronification e. Shredding Correct answer- a. Fibrillation In stock prep, refining is typically controlled by measuring a. Basis weight b. Temperature c. Freeness d. Consistency e. Production rate Correct answer- c. Freeness _________ are added to a papermaking slurry primarily to improve ____________, which is significantly reduced by __________________ a. Retention aids, strength, refining b. Fillers, opacity, refining c. Sizing agents, drainage, refining d. Fillers, formation, drainage Correct answer- b. Fillers, opacity, refining What phenomenon, visibly located in the vacuum section of a single-wire paper machine, indicates the transition from a slurry to a web? a. Water mark b. Dandy roll c. Flat box d. Couch line e. Dry line Correct answer- e. Dry line Rolls in the press section must be crowned in order to avoid what sheet defect? a. Wet center b. High basis weight spots c. Roughness d. Two-sidedness e. Thin edges Correct answer- a. Wet center What are the units used for the CSF test in stock prep? a. grams b. % c. seconds d. ml e. degrees Correct answer- d. ml The paper sheet has a defect consisting of sequential light and dark stripes. What device in the headbox approach system might have been bypassed? a. Headbox screen b. Basis weight valve c. Fan pump d. Stuff box e. Deculator Correct answer- d. Stuff box In papermaking, "fines" come from.... a. Hardwood b. Refining c. Sawdust d. Bleaching e. Kraft pulping Correct answer- b. Refining Stock leaves the headbox out of what opening? a. Manifold b. Jet c. Throat d. Orifice e. Slice Correct answer- e. Slice This critical device regulates the flow of thick stock to the paper machine and is usually controlled by the dry-end scanner? a. Thick pass filter b. Throttling valve c. Deculator d. Basis weight valve e. Stuff box Correct answer- d. Basis weight valve Which of the following is a type of chest you would find in the stock prep area? a. Low-density b. Machine c. Leveling d. Buffering e. Cull Correct answer- b. Machine What are the main purposes of the press section on a paper machine? a. Remove water, improve bulk b. Remove water, consolidate the web c. Remove water, finalize hydrogen bonding d. Remove water, decrease porosity Correct answer- b. Remove water, consolidate the web The mixture of fibers and additives needed to meet the requirements of a paper/board grade is called what? a. Furnish b. Grade sheet c. Cut sheet d. Recipe e. Specification Correct answer- a. Furnish These are added in stock prep for printing and writing grades to help improve the opacity of the sheet a. Dyes b. Alums c. Gums d. Fillers e. Fines Correct answer- d. Fillers Retention aids are used to keep ________ and ________ in the sheet on the paper machine a. negatively-charged particles, positively-charged particles b. starch, fillers c. fibers, water d. fines, fillers Correct answer- d. fines, fillers Microturbulence is essential on the wet end of a paper machine in order to ensure good a. Basis weight b. Runnability c. Yield d. Formation e. Brightness Correct answer- d. Formation On a single-wire paper machine, what is last roll before the press section, where the paper sheet must leave the forming wire and go to the press section? a. Release roll b. Offset roll c. Transfer roll d. Dandy roll e. Couch roll Correct answer- e. Couch roll On a single-wire paper machine wet end, what are the forces used to remove water from the sheet, in order? a. microturbulence, momentum, suction b. vacuum, squeezing, evaporation c. suction, impulse, heat d. gravity, vacuum, pressing Correct answer- d. gravity, vacuum, pressing Your writing pad has a backing board that consists of 10 plies. What paper machine was used to make this board? a. Multi-fourdrinier b. Multiple-headbox fourdrinier c. Gap former d. Delta former e. Cylinder machine Correct answer- e. Cylinder machine What kind of virgin fiber is used to impart superior softness in premium bath tissue grades? a. Eucalyptus b. Hardwood TMP c. Recycled free sheet d. Heavily refined e. Northern hardwoods Correct answer- a. Eucalyptus What are heavy-weight board grades typically made using multiple plies? a. Higher stiffness and higher opacity b. Higher stiffness c. Lower cost and higher stiffness d. Better brightness and lower cost e. Lower cost Correct answer- c. Lower cost and higher stiffness To see if you were paying attention during the video and in class...what cuts the wide master roll of tissue into the smaller units that end up in your bathroom? a. Unwinder b. Slitter-rewinder c. Slicer d. Log saw e. Core builder Correct answer- d. Log saw On a corrugator, the first section is called the what? a. Glue applicator b. Double-backer c. Weaver d. Single-facer e. Hot press Correct answer- d. Single-facer Which of the following statements is true for a cylinder machine? a. Float-through drying is preferred b. Traditional pressing cannot be used c. A dandy roll is essential d. The sheet is formed upside down e. Only good for up to six plies Correct answer- d. The sheet is formed upside down What kind of tissue making machine uses a forming felt instead of just forming wires? a. Crescent former b. C-former c. S-former d. Yankee former e. Delta former Correct answer- a. Crescent former What is the term used to describe lightweight board grades with a high-quality coating? Postcards are a prime example. a. SBS b. Bristols c. LWC d. SC e. Super-coated Correct answer- b. Bristols Which of the following would NOT be found on a Yankee dryer? a. Felt b. Doctor blade c. Hot air cap d. Spray boom e. Applicator roll Correct answer- a. Felt Which of the following describes how tissue is different from a lightweight printing grade of paper? a. None of these answers b. Can only be made on a gap former c. Uses only hardwood fibers d. Fibers are more refined e. Sheet is internally debonded Correct answer- e. Sheet is internally debonded Which of the following does NOT distinguish market pulp grades, compared to most paper and board grades? a. Slower machine speeds b. Higher basis weights c. Only one fiber type in furnish d. Always bleached e. Higher refining in stock prep Correct answer- e. Higher refining in stock prep