PKG101_FS08_Glass_Pkg_1_Outline

PKG101_FS08_Glass_Pkg_1_Outline - Glass Packaging Glass...

Info iconThis preview shows pages 1–11. Sign up to view the full content.

View Full Document Right Arrow Icon
Glass Packaging
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Glass History One of oldest man-made substances 12,000 bc Glass beads in Syria Sailors with soda ash 7,000 bc Egyptians had glass jewelry 3,000 bc Egyptians made glass bottles Wound glass strands
Background image of page 2
Glass History (Con’t) 300 bc First glass blow pipe Larger containers Better finish Last part of bottle which was made 200 bc Romans made flat glass
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Glass History (Con’t) 1608 Glass manufacturing in Jamestown 1800’s Invention of machines to make containers (25% of glass for containers by 1880) 1903 “Libby-Owens” First fully automatic bottle making machine (Owens worked for Libby Company)
Background image of page 4
Glass Definition Glass is an inorganic, non-crystalline, brittle solid that is formed by cooling from a liquid state. It shows no discontinuous change in properties at any temperature, but becomes more rigid when its temperature decreases and less rigid when its temperature increases.
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
What does it mean to be non-crystalline? When tiny crystals form in a repeating orderly fashion in a material, the material is said to be crystalline or to have "crystalline regions." Most metals have a crystalline structure. Packaging glass is non-crystalline Packaging glass does not have a crystalline structure, it is amorphous, made up of random, unordered molecules.
Background image of page 6
What does it mean to be non-crystalline? Why is this important o Crystalline regions of a glass container are not as clear and are usually weaker than the amorphous sections. o Containers made of crystalline glass are more likely to break (shatter) when shocked, such as by being dropped or "banged around" during transport. o Pressurized containers, such as champagne bottles may literally explode because of the internal pressure. o The milky appearance of a crystalline region obscures the consumer's view of the product.
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Crystalline vs. Non- crystalline Crystalline Vitreous ( Glassy )
Background image of page 8
What does it mean to be brittle ? Brittle materials behave differently than ductile materials. Ductile materials, which include steel, aluminum, rubber and many plastics, deform gradually under load. As the load increases, the deformation increases proportionally until it reaches a level of deformation called the plastic limit. Brittle materials tend to fail in a single, sudden action. When a brittle material, such as cast iron, ice, or glass, is loaded, there is little observable deformation until the material suddenly fails (breaks). Brittle materials are usually strong in compression and weak in tension.
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
What does "no discontinuous change at any temperature " mean? A material that shows discontinuous changes with
Background image of page 10
Image of page 11
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/09/2009 for the course PKG 101 taught by Professor Haroldhughes during the Spring '08 term at Michigan State University.

Page1 / 41

PKG101_FS08_Glass_Pkg_1_Outline - Glass Packaging Glass...

This preview shows document pages 1 - 11. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online