26
1 Introduction Definition: Glass may be defined, physically, as a rigid, under cooled liquid having no definite melting point and a sufficiently high viscosity(greater than 10^12Pa.s) to prevent crystallization; and chemically, as the union of the nonvolatile inorganic oxides resulting from the decomposition and fusion of alkali and alkaline earth compounds. Sands and other glass constituents, ending in a product with a random atomic structure. Glass is a completely vitrified  product, or at least such a product with a relatively small amount of non-vitreous material in suspension. Types and Characteristics: Glass has many characteristics, as they are transparent, high resistance to chemical attack, an electrical insulator, ability to contain vacuum etc. There are seven types of glass, which are given as following: 1. Annealed Glass 2. Toughened glass 3. Laminated glass 4. Mirrored glass 5. Patterned glass 6. Extra-cleared Glass Historical backgrou nd: The discovery of glass, which we use in our daily life, is very uncertain. Naturally occurring glass was used during Stone Age as the cutting tool. Archaeological evidence shows that first glass was used in north Syria, Mesopotamia or Ancient Egypt. The union of sand and alkali caught the men’s attention and led to subsequent effort at imitation. As early as 6000 or 5000B.C. the Egyptians were making sham jewels of glass, which were fine workmanship. A rapid growth in glass technology took place in Egypt and western Asia during Bronze Age. This includes colored glass and beads according to archeologists. Soda ash was the alkali of Syrian and Egyptians they extracted soda ash from ashes of many plants. In central Asia and Egypt extensive glass  production occurred during 15 th century BC. In Islamic Spain, clear glass mirrors were producing window glass is mentioned as early as 290AD. A twelfths century monk invented the hand blown window glass cylinder. During Medieval times, Venice enjoyed a monopoly as the center of glass industry. No glass was made in either Germany or England until the sixteenth century. Plate glass appeared as a

Gunj glass works. ltd visit report

Embed Size (px)

Citation preview

7/28/2019 Gunj glass works. ltd visit report

http://slidepdf.com/reader/full/gunj-glass-works-ltd-visit-report 1/26

7/28/2019 Gunj glass works. ltd visit report

http://slidepdf.com/reader/full/gunj-glass-works-ltd-visit-report 2/26

7/28/2019 Gunj glass works. ltd visit report

http://slidepdf.com/reader/full/gunj-glass-works-ltd-visit-report 3/26

7/28/2019 Gunj glass works. ltd visit report

http://slidepdf.com/reader/full/gunj-glass-works-ltd-visit-report 4/26

7/28/2019 Gunj glass works. ltd visit report

http://slidepdf.com/reader/full/gunj-glass-works-ltd-visit-report 5/26

7/28/2019 Gunj glass works. ltd visit report

http://slidepdf.com/reader/full/gunj-glass-works-ltd-visit-report 6/26

7/28/2019 Gunj glass works. ltd visit report

http://slidepdf.com/reader/full/gunj-glass-works-ltd-visit-report 7/26

7/28/2019 Gunj glass works. ltd visit report

http://slidepdf.com/reader/full/gunj-glass-works-ltd-visit-report 8/26

7/28/2019 Gunj glass works. ltd visit report

http://slidepdf.com/reader/full/gunj-glass-works-ltd-visit-report 9/26

7/28/2019 Gunj glass works. ltd visit report

http://slidepdf.com/reader/full/gunj-glass-works-ltd-visit-report 10/26

7/28/2019 Gunj glass works. ltd visit report

http://slidepdf.com/reader/full/gunj-glass-works-ltd-visit-report 11/26

7/28/2019 Gunj glass works. ltd visit report

http://slidepdf.com/reader/full/gunj-glass-works-ltd-visit-report 12/26

7/28/2019 Gunj glass works. ltd visit report

http://slidepdf.com/reader/full/gunj-glass-works-ltd-visit-report 13/26

7/28/2019 Gunj glass works. ltd visit report

http://slidepdf.com/reader/full/gunj-glass-works-ltd-visit-report 14/26

7/28/2019 Gunj glass works. ltd visit report

http://slidepdf.com/reader/full/gunj-glass-works-ltd-visit-report 15/26

7/28/2019 Gunj glass works. ltd visit report

http://slidepdf.com/reader/full/gunj-glass-works-ltd-visit-report 16/26

7/28/2019 Gunj glass works. ltd visit report

http://slidepdf.com/reader/full/gunj-glass-works-ltd-visit-report 17/26

7/28/2019 Gunj glass works. ltd visit report

http://slidepdf.com/reader/full/gunj-glass-works-ltd-visit-report 18/26

7/28/2019 Gunj glass works. ltd visit report

http://slidepdf.com/reader/full/gunj-glass-works-ltd-visit-report 19/26

7/28/2019 Gunj glass works. ltd visit report

http://slidepdf.com/reader/full/gunj-glass-works-ltd-visit-report 20/26

7/28/2019 Gunj glass works. ltd visit report

http://slidepdf.com/reader/full/gunj-glass-works-ltd-visit-report 21/26

7/28/2019 Gunj glass works. ltd visit report

http://slidepdf.com/reader/full/gunj-glass-works-ltd-visit-report 22/26

7/28/2019 Gunj glass works. ltd visit report

http://slidepdf.com/reader/full/gunj-glass-works-ltd-visit-report 23/26

7/28/2019 Gunj glass works. ltd visit report

http://slidepdf.com/reader/full/gunj-glass-works-ltd-visit-report 24/26

7/28/2019 Gunj glass works. ltd visit report

http://slidepdf.com/reader/full/gunj-glass-works-ltd-visit-report 25/26

7/28/2019 Gunj glass works. ltd visit report

http://slidepdf.com/reader/full/gunj-glass-works-ltd-visit-report 26/26