文档介绍：Lesson 6 Glass Containers 第6课玻璃容器
Glass Types and General Properties
Bottle Manufacture
Bottle Design Features
一. Glass Types and General Properties
Definition and characters-- an anic substance fused at high temperatures and cooled quickly
About the ponent ---silica (quartz),
The ingredients of ponents and different formulations.
Other pounds be used to achieve improved properties: decolorizers – to clear; colorants– change the appearance…
Other glass types used for special packaging purposes.
pounds, pounds, borosilicate glasses…
The problems of different formulations include soda-lime and regular container glass are mixed when recycling.
一. Glass Types and General Properties
Advantages as a packaging material:
inert to most chemicals
perfect foods container.
impermeability
clarity
perceived image
rigidity
stable at high temperatures
Disadvantages :
breakability; high weight; high energy costs .
二. Bottle Manufacture
1. Blowing the Bottle or Jar
Process: "blow-and-blow”; "press-and-blow"
two molds: blank mold forms the neck and the initial shape
blow mold produce the final shape
A blank es in a number of sections:
finish section
cavity section (made in two halves to allow parison removal)
a guide or funnel for inserting the gob
a seal for the gob opening once the gob is settled in the mold
blowing tubes through the gob and neck openings
二. Bottle Manufacture
Figure Furnace draw-off orifice
and gob shears
Molten glass flows depending on the bottle size.
Mechanical shears snip off "gobs" of molten glass. Each makes one container.
Falling gob is caught by spout and directed to blank molds.
Mass-production is made up of several individual sections,
each is an independent unit holding a set of bottle-making molds.
Large bottles consists of a blank mold and a blow mold.
Higher production using double or triple gobs on one machine. two or three blank molds and similar blow molds.
Gobs ---to form blank mold
二. Bottle Manufact