Project Report on Printing Technology

A  pouch is similar  to a bag  except  it is simpler in constructions  and is made from roll stock, filled and sealed on automatic high speed machinery.  There are many possible variations of pouch sizes, shapes and compositions.  Few  general types  can  be described. Pouches can be defined as  vertical  or horizontal, depending on how they are formed. Vertical  pouches are made by drawing  one or two webs downward a forming  mandrel, sealing  one  or two  seats to form a tube and adding a  top and bottom  seal  for closure  than one   side  seal  is  used  and centured,  it  is  called a pillow  type. If  the  side  seal  is inserted  on  one side and a fold on the other, it  is  called  a three  side  seal pouch.  When two side  seals  are  used  it  is called  a four side seal poucher firm-sealed pouch. The   product  is  added  while the pouch is  in  the   vertical  position and usually  before it is reserved from the  web. Side seams  can  be lapped  or butted and qussets are optional.  Horizontal pouches are  made by drawing one or to webs in  a  horizontal  direction. Usually  when  two webs in a horizontal are fed they are positioned  in the horizontal plane and formed into  a  four-side sealed  pouch. The  product is added beofre  the  top web is sealed in place frequently the bottom web is formed into a packed.  When  a single web is fed, it is usually drawn  only  a plough  to fold it in to the vertical plane.  The bottom  may  be sealed  or left unsealed side scals are made and the  package is filled through the top, usually after being sewred from the  web.  Again gussets are optional.