PKSC 1020 Lecture Notes - Lecture 3: Paperboard, Corrugated Box Design, Papermaking
26 Sep 2017
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Cellulose (raw material for paper what we way specially is raw material) Paperboard greater than 0. 012"" thick thickness is referred to as points . 0. 001=1 point (example: 0. 014 = 14 point paperboard) 1: cross section of wood fiber, structure of cellulose. Paper loses strength when wet they break or high humidity. Three ways to make pulp: mechanical (groundwood) Least expensive for 2 reasons: doesn"t use chemicals, uses all of the wood. Usually combined with other pulps: chemical, sulfate (kraft german word for strength like grocery store bag or to wrap meat) most widely used, sulfite, soda. Start with pulp fibers suspended in water. Fourdrinier machine see figure 5. 1 & 5. 2 in text. Cylinder machine see figure 5. 3 & 5. 4 in text. Cross section of cylinder board see figure 5. 5 in text. Increases density (mass/volume) and smoothness more fibers pressed important for strength and print quality. Measured and expressed in inches for paper.
