PKG Glass Portion of Review Session
PKG Glass Portion of Review Session PKG 101
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This 3 page Class Notes was uploaded by Samantha Shea on Tuesday September 27, 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 6 views. For similar materials see Principles of Packaging in Packaging Science at Michigan State University.
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Date Created: 09/27/16
Glass Portion From Review Session Tuesday, September 27,3:12 PM ► 2015 U.S. Glass Container Shipments By Category ○ Beer (57%) ○ Food (19%) ○ Beverages (9%) ○ Liquor (4%) ○ Ready to Drink (3%) ○ Wine (8%) ○ Other (0.2%) • 82% of glass container shipments are for beverages ► Raw materials Sand ○ ○ Soda ash ○ Limestone ► Glass is 100% recyclable, endlessly. ► Cullet • 2 types ○ Plant cullet (internal) ○ Ecology cullet (Post consumer) • Furnaces utilize between 15 & 90% Cullet • Key Benefits ○ 100% reusable ○ Closes the loop ○ Lowers energy usage ○ Reduces raw material consumption ► What is Light Weighting ○ The reduction of the amount of glass used to make any given bottle or jar while meeting requirements for the package ► Light Weight Advantages ○ Reduces energy costs ○ Reduces freight costs Reduces raw materials usage ○ ○ Increases production speeds ○ Increases filling line efficiency ○ Reduces CO2 ○ Reduces energy costs ○ Reduces freight costs ○ Reduces raw materials usage ○ Increases production speeds ○ Increases filling line efficiency ○ Reduces CO2 ► Flint (Clear) Decolorizing ○ Iron content imparts green color ○ Selenium metal imparts pink or salmon color ○ Combination produces gray color ○ Appears clear to the human eye ► Amber Glass ○ Iron + Sulfur + Excess Carbon ○ Reduced Glass (Oxygen starved) ○ Absorbs wavelengths <450 nm § Light protection for beer, pharmaceuticals items, etc. ► The Basic Parts of a Glass Container • Finish: Holds cap or closure ○ Sealing surface: contacts sealing gasket ○ Glass thread or lug: protruding ridges for fastening closure ○ Continuous thread: for fastening screw-‐type closure ○ Glass finishes are standardized ○ Transfer bead: used in transfer of container • Body:Made in body-‐mold ○ Shoulder: top portion where diameter decreases ○ Heel: curved portion at the bottom ○ Side wall: area between shoulder and heel ○ Mold seam: vertical mark from matching two parts of body mold • Bottom: made in bottom plate ○ Bottom plate parting line: horizontal markymold matching bod-‐ parts with bottom plate ○ Bearing surface: portion on which container rests ► The Basic Parts of a Glass Container: Bearing Surface • The main function of these bumps called "stipples" is to limit the contact area between the bottom of the hot container and the equipment it is set onto, preventing it from cooling even more rapidly and developing more thermal stress. ► Shape ► Embossing ► Internal & External Embossing ► Compression • Glass is relatively strong in compression ► Tension Glass is relatively weak in tension ► Embossing ► Internal & External Embossing ► Compression • Glass is relatively strong in compression ► Tension • Glass is relatively weak in tension • It's a brittle material ► Surface Treatments • Coating material applied to outside surface of glass containers ► Why apply Surface Treatments? • Preserves container strength • Facilitates flow through glass manufacturers' line • Facilitates flow through customer"s filling line
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