PKSC 1020 Lecture Notes - Lecture 3: Fiberboard, Solid Bleached Board, Containerboard
3 Oct 2016
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Paperboard greater than 0. 012 thick (12 thousandth of an inch) thickness is referred to as points . 0. 001 = 1 point (example: 0. 014 = 14 point paperboard) Lumen in the middle, lamella with fibrils (composed of chains of cellulose). Answer: cellophane (clear, shiny plastic that comes around flowers) Three ways to make pulp (like sawdust: mechanical (groundwood): grinding a tree into sawdust and mixing with water to make sawdust. Least expensive for 2 reasons: doesn"t use chemical, uses all of the wood. Usually combined with other pulps: chemical, sulfate (kraft: means strength in german) most widely used. Example of kraft: paper grocery bag, very strong: sulfite, soda (not mentioned in your book, rarely used) Corrugated media ( inside part of corrugated board, the zig-zag stuff) Start with pulp fibers suspended in water. Twinwire (mentioned in book as a 3rd rarely used) Fourdrinier machine see figure 5. 1 & 5. 2 in text. Cylinder machine see figure 5. 3 & 5. 4 in text.
