The plastic bags we use everyday, are made from granules of linear polyethylene resin that will be melted,they combine the linear polyethylene with another low density one in the mixer. The granules are perfectly blended into a homogeneous material.
The bag changes from blowing film to bag to flat roll up
Granule smelt in the extruder,which heats them to a temperature varying between 180 and 240 degree centigrade.this products a film of polyethylene in the form of the tube,it is several hundreds meters long,has a minimum thickness of 8 micron ,and circumference of 80 centimeters,the plastic tube gradually cools down ,rollers the flatten out the plastic tube,the polyethylene film is now easy to work,and now they cut the tube on two sides to obtain different rolls.
This knife then cuts the film to the required width . The excess strip is salvaged in the other tube. Several hundreds of meters of film are produced and rolled up.this particular roll contains the required quantity of film. When the rollers full, the film is cut. This rolls move forward,
and can be transported to another department ,an empty roll begins to fill up automatically.
A full roll weighs 158 kilos, and produce 35000 bags.
3.The next step , printing on the bags, this alcohol based ink circulates continuousl to retain is viscosity. Impressions are made by ink and rollers. Here another color is being applied on the bags
once the printing is over, the plastic film is rolled up again.
4.The roll now is full and the cutting of bags will get started .a sealer bonds the edges of the bag together with heat. The wheel pick up the bag，and puts them on two spindles.that can hold 250each.
Manufacturing process of ziplock bags
Here they are making bags with the hermetic zipper. The zipper is made from a plastic pad,which inserts into a slot. The zipper is made in advance,and is unrolled progr
the zipper strip is cut and heat bonded to the bag at 180 degreecentigrade . And here is the zipperbag all finished.
Manufacturing process of shopping bags
6.In another department , we made plastic bags with handles,printed bag circulate on this rollers the machine what welds the sides, gives the bags the desired shape. The another machine
with a punch cuts the handle holes. Bags at the 150 degree and cut in 150 degree centigrade,
7.Packaging bags. One end of the bag is heat sealed . This machines makes holes, with let air out ofthe bags when it’s being filled.to allow them to be generously filled with items. At this stage, a stamper cuts the handles holes. Bags are cut to the required size, automatically sealing the other side of it.We can makes 8 types of bags for overall total of just over 1 million a day.