主要内容 1、直线的投影 2、直线对投影面的相对位置 3、直线上的点 4、两直线的相对位置

主要内容 1、点的两面投影 2、点的三面投影 3、两点的投影

1-1画法几何的任务 1、研究在平面上表达空间形体一图示法 2、研究在平面上解答空间几何问题一图解法

Background Steel is one of the older packaging materials. - Originally used for round, square, and rectangular boxes and canisters. - The oldfashioned- appearance of fabricated metal box is effectively used to create nostalgia for specialty and gift-type containers

Historical perspective Corrugated Board Properties and Tests Corrugated Boxes Carrier Rules Stacking and Compression

Introduction Definition of paper Paper is defined as a matted or felted sheet usually composed of plant fiber Paper has been commercially made from such fiber sources as rags(inen), bagasse (sugar cane), cotton, and straw. Modern paper is made

content Introduction The Contain Function The Protect/Preserve Function Food Preservation The Transport Function The Inform/Sell Function

What is Packaging? 1. A definition of packaging Packaging is best described as a coordinated system of preparing goods for transport, distribution, storage, retailing, and use of the goods 2. The many things a package might be asked to do Packaging is a complex, dynamic, scientific, artistic, and controversial business function Fundamental function of packaging: contain protects/preserves transports informs/sells

Polymer Properties Depend On 1. What elements are in the molecule? 2. What size(molecular weight) is the molecule? 3. Is the molecule polar or non-polar? 4. What shape is the molecule? 5. What is its thermal history? 6. What is its mechanical history?

Glass Types and general properties Bottle manufacture Bottle design Features