PKG Lecture 5 Notes
PKG Lecture 5 Notes PKG 101
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Popular in Packaging Science
This 3 page Class Notes was uploaded by Samantha Shea on Thursday September 15, 2016. The Class Notes belongs to PKG 101 at Michigan State University taught by p. koning in Fall 2016. Since its upload, it has received 30 views. For similar materials see Principles of Packaging in Packaging Science at Michigan State University.
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Date Created: 09/15/16
Thursday, September 15th Lecture Notes Thursday, September 15, 10:13 AM Wood Packaging ► Uses of Wood ○ For packaging, the most common use of wood for s a raw material manufacturing paper and paperboard. ► Wood Applications ○ Wood is used for packaging applications in the form of barrels, boxes, baskets, wire-‐bound containers, crates, and pallets. ○ The biggest use of wood in packaging is for the manufacture of pallets. ○ Wood is often the best overall choice for pallets in terms of the combination of strength, weight, and cost. ○ Wood packages can easily be custom made in small quantities, while most other materials require longer production runs to be economical. ► Advantages of Using Wood ○ Good strength to weight ration ○ Economical structural material It does not require sophisticated equipment (for a box or crate) ○ ○ IDEAL FOR RIGID STRUCTURES NEEDED IN SMALL QUANTITIES ► Advantages ○ Wood has excellent rigidity and outstanding mechanical properties in bending. ► Disadvantages ○ Wood is not well suited to high speed mechanized packaging operations ○ High labor factor ○ Bulky § Shipping § Storage ○ Wood is moisture sensitive, can lead to stress on joints, as well as to warping and even fracture ► Types of Wood ○ Softwood: is wood from conifers ○ Softwood is generally easy to work with, but has less strength than hardwood (in wood applications -‐ not paper) ○ Examples of softwoods include pine, fir, cedar, redwood, etc. ○ Hardwoods : wood from deciduous trees ► Types of Wood ○ Softwood: is wood from conifers ○ Softwood is generally easy to work with, but has less strength than hardwood (in wood applications -‐ not paper) ○ Examples of softwoods include pine, fir, cedar, redwood, etc. ○ Hardwoods : wood from deciduous trees ○ Hardwoods are generally more difficult to work with and are stronger than softwoods. (in wood applications -‐ not paper) ○ Examples of hardwoods include oak, maple, birch, walnut, cherry etc. ► Four Structural Wood Groups ○ Group 1: rdensity ○ Group 2: medium density ○ Group 3: me-‐density ○ Group 4: -‐ density ► Wood Properties ○ The moisture contentof wood (MC) is the ratio of the mas of water in the wood to a reference wood mass ○ The process of drying the s asoning. called ► Seasoning of Wood ○ The strength of the wood tends to increase as it dries, and it is more resistant to attack by insects and microorganisms ○ Another advantage of drying wood is that its weight is substantially decreased. ► Wood Properties ○ Wood for packaging should be well seasoned and have a moisture contents around -‐20% ○ A nominal 1" x 4" measures about 3/4" x 3 1/2" ► Processed Wood ○ Plywood-‐more uniform than lumber ○ Less shrinkage ► Particle Board & OSB (oriented strand board) ○ OSB, weight is smaller and a lower cost, as well as the same strength ad durability. 2x shear strength plywood ► Pallets ○ Biggest use for wood in packaging § $1 billion per year ○ CHEP ► Two Broad Categories of Pallets 1. Stringer Style • The first dimension (the 48' in the case of GMA pallet) is along the length of the stringer board • Two way entry (sold stringers) • Partial four way entry (must have "notches added to stringers" 2. Block Style 1. Stringer Style • The first dimension (the 48' in the case of GMA pallet) is along the length of the stringer board • Two way entry (sold stringers) • Partial four way entry (must have "notches added to stringers" 2. Block Style • Contains blocks instead of stringers • Always four way entry ► GMA standardized pallet ○ Grocery Manufacturers Association (GMA) ○ There are two GMA pallet sizes :48" x 40" and 48"x 48" (stringer style pallet) ○ The pallets are designed to fit two across in standard US truck ► EuroPallet ○ Nine block design, 1,200mm x 800mm and 1,200mm x 1,000mm ○ The GMA dimensions and the Europallet dimensions are not identical
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