The given process diagram illustrates the various stages involved in the process of recycling glass drink bottles. In the first stage, recycled glass, soda ash, sand and other raw materials are fed into a furnace where they are heated to 1500° centigrade and melted. The molten material is then sent to a fore hearth, where the temperature is made uniform. The next stage involves using a cutting machine to cut the molten glass into identical pieces before forcing it into the shape of a bottle using a mould. The temperature of the bottles is reduced to less than 1150°c before passing them through a rapid cooling process, in which the temperature is further dropped to below 500°c. Upon cooling down, the bottles are conditioned to make them more durable by exposing them to extreme temperature of up to 1200°c. Afterwards, when the temperature of bottles falls below 500°c, they become ready for surface treatment, which involves first cooling the bottles to 120°c and then spray coating them provide a smooth texture. This is followed by a quality check which identifies faults. Those bottles which do not pass the quality control check are rejected and recycled in the furnace, while the bottles which meet the quality standards are packed and made ready for delivery. Overall, this is a man-made linear process consisting of nine stages, starting from heating the raw material and ending at the delivery of the finished product. 
The  
given
  process
 diagram illustrates the various  
stages
 involved in the  
process
 of recycling glass drink  
bottles
. In the  
first
  stage
, recycled glass, soda ash, sand and other raw materials  
are fed
 into a furnace where they  
are heated
 to 1500° centigrade and melted. The molten material is then  
sent
 to a fore hearth, where the  
temperature
  is made
 uniform. The  
next
  stage
 involves using a cutting machine to  
cut
 the molten glass into identical pieces  
before
 forcing it into the shape of a  
bottle
 using a  
mould
.  
The
  temperature
 of the  
bottles
 is  
reduced
 to less than 1150°c  
before
 passing them through a rapid cooling  
process
, in which the  
temperature
 is  
further
 dropped to below 500°c. Upon cooling down, the  
bottles
  are conditioned
 to  
make
 them more durable by exposing them to extreme  
temperature
 of up to 1200°c. Afterwards, when the  
temperature
 of  
bottles
 falls below 500°c, they become ready for surface treatment, which involves  
first
 cooling the  
bottles
 to 120°c and then spray coating them provide a smooth texture. This  
is followed
 by a quality  
check
 which identifies faults. Those  
bottles
 which do not pass the quality control  
check
  are rejected
 and recycled in the furnace, while the  
bottles
 which  
meet
 the quality standards  
are packed
 and made ready for delivery.  
Overall
, this is a  
man
-made linear  
process
 consisting of nine  
stages
, starting from heating the raw material and ending at the delivery of the finished product.