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PKSC 102- paper and paperboard

by: Addie Pearson

PKSC 102- paper and paperboard 81499 - PKSC 1020 - 001

Addie Pearson

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week 2 notes. first of the 4 materials covered.
Introduction to Packaging Science
Heather P Batt
Class Notes
Intro to Packaging Science, Packaging Science, Batt, Dr. Batt, PKSC 102, PKSC 1020
25 ?




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This 3 page Class Notes was uploaded by Addie Pearson on Wednesday February 10, 2016. The Class Notes belongs to 81499 - PKSC 1020 - 001 at Clemson University taught by Heather P Batt in Fall 2015. Since its upload, it has received 38 views. For similar materials see Introduction to Packaging Science in Nutrition and Food Sciences at Clemson University.

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Date Created: 02/10/16
PACKAGING SCIENCE LECTURE (2) PACKAGING MATERIALS - Paper and paperbpard (wood products) - Metals (steel and aluminum) - Glass - Plastics ( petrochemicals) PAPER AND PAPERBOARD  Raw material- wood  Applications for wood packaging o Barrels o Crates o Nailed or wirebound boxes  Wood contains o 50% cellulose  Structure for paper/paperboard o 30% lignin  Brown sticky substance that holds it together o 20% carbohydrates  Paper= 0.012” thick or less  Paperboard= greater than 0.012” thick is referred to as points .001”= 1 point (.014” is 14 point board)  *** see cross section of wood fiber *****see structure of cellulose; cellulose has beta bonds we can’t break down; we break down alpha bonds. Cellulose is polar, water is polar; like attract like in chemistry. Cellulose/paper likes water and will absorb water and loses strength  What “plastic” comes from wood? CELLOPHANE  Three ways to make pulp 1. Mechanical (groundwood) a. Lease expensive bc: doesn’t use chemicals b. Uses all the wood c. Low brightness and strength 2. Chemical a. Sulfate (Kraft= German for strength) b. Sulfite c. Soda d. Higher quality than mechanical e. Grocery store (when you get meat/grocery bag) f. Cook wood in chemicals g. Grind in disc refiner h. Not used much except for corrugated media (media- inside waves in cardboard in between the two walls)  Paper making o Start with pulp- fibers suspend in water o Papermaking machinery is large  Speed: 3000 ft/min  Web width: 30 ft  Production: 800 miles/day o Two types of paper making machines  Fourdrinier- for paper or paperboard  Cylinder- for paperboard only o General procedure: screen, squeeze, dry o Calendaring: paper run through stack of rollers; increases density and smoothness; important for strength and print quality o Paper/paperboard specifications  Basis weight- lbs/sq ft  Paper: lbs/3000 sq ft  Paperboard: lbs/1000 sq ft o Thickness: measured and epressed in inches for paper, expressed as points for paperboard  Advantages for using paper and paperboard o Renewable o Recyclable o Inexpensive o Easily printed upon  Disadvantages o Porous to moisture and oxygen o Loses strength when wet o Combustible PAPERBOARD - Bending grade board- used for folding cartons - Types of board o Clay coated newsback (smooth outside, natural inside; cake box) o Solid bleached sulfate (makeup, medicine, etc) - Uses o Cereal boxes o Cake mix boxes - Three basic design styles o Tube (straight tuck, reverse tuck, seal end) o Tray (beers, brightwood, walker) o Hybrid (milk carton) SOLID FIBERBOARD - Several poles of paperboard laminated together - Uses: o Shipping containers o Dividers o Corner supports CORRUGATED PAPERBOARD - Corrugated medium flutes: A, B, C, E, and F flutes (stuff between the walls) - Linerboard comes in different basis weights specified with burst or edge crush tests - Single face, single wall, double wall and triple wall - Important features: o Height of flutes o Distance between flute peaks o Type of liner board - Design: o CAD o Specifications of freight truck and railroad associations o Product requirements o Product requirements o Shipping/storage/handling conditions o Mist account for scoring allowances (amount of material taken up in the fold (score) related to board thickness) o Flutes should be oriented parallel to depth dimension for best stacking strength - Uses: o A, B, C double and triple wall: shipping boxes; point of purchase displays


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