Plastic Bags

how are plastic bags made?

i have a report to do and its due soon but i need to know how are plastic bags made? wat are they made of and other things about plastic bags so please help!

Making a plastic bag is a pretty simple but at the same time complex event.

Plastic resin pellets, which are available in different grades, are sucked from a storage bin and placed into a hopper. Then the pellets are ground up very finely and then melted, and then they are blown into a "bubble" through a process called extrusion.

The machine that does this is called an extruder. Bubbles are made into varying widths. The bubble is drawn upwards and cooled at the same time. It is then folded and put onto a core to make a roll of plastic film. The roll of film is then placed onto a finishing machine where it may be cut down into different widths, or maybe a zipper seal is added or formed.
Finishing: mold in a lock strip at the top on each half.
then you fold it in half and bond the edges on two sides, that is the makings of most sandwich bags or freezer bags.
Garbage bags are taking a sheet of plastic and vaccuumed into a tube. this gives you the shape, the tubes are changed to get the sizes of bags. The plastic is changed to get the mil thickness for heavly duty bags.
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Industrial manufacturing processes are fascinating to watch and few people know how common, everyday items are produced.

Plastic bags start out life as large, thin rolls of plastic, often produced by the bag manufacturers from plastic pellets. The plastic can be produced in different colours by adding coloured pellets to the semi-transparent raw plastic. The roll of plastic is unwound and fed into the machine that produces the bags or the plastic film is extruded at the beginning of the line.

The bags are printed using several rollers in sequence, each printing one colour at a time. A four-colour CMYK printing process (cyan, magenta, yellow, and black) is usually used.

The film is then folded over on itself and heat-sealed along the side seam. Heavier gauge bags may be made from two rolls of plastic, brought together and joined at both sides. This forms a flattened tube of plastic. Handles may be added at this stage by a stamping / heat bonding process or molded directly into the bag. The bags are then formed by heat-sealing the bottom and cutting them to shape and size. Some heavy-weight bags have plastic handles added after the bags are made. Waste plastic from cuttings is recycled into new bags.
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See for more info:
http://www.ehow.com/how-does_4969481_how-plastic-bags-made.html
http://www.life123.com/home-garden/green-living/recycling/how-are-plastic-bags-made.shtml
http://pubs.acs.org/cen/whatstuff/stuff/8238plasticbags.html

Pictures of Plastic Bag factories:
http://www.interplas.com/custom-plant-profiles

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NSOP Case of 3000 5x8 15 Mil Clear Open Top End Plastic Poly Bags PB 58 PB58
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VIDEOJET 206728 PLASTIC TUBING NEW IN FACTORY BAG
VIDEOJET 206728 PLASTIC TUBING NEW IN FACTORY BAG
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BOSTON GEAR JP5014 54198 PLASTIC U JOINT NEW IN FACTORY BAG
BOSTON GEAR JP5014 54198 PLASTIC U JOINT NEW IN FACTORY BAG
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INDUSTRIAL MRO XWAG 5 PLASTIC SCREW FOR SLIDE RAIL PK OF 50 NEW IN BAG
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206728 Videojet Plastic Tubing New in Bag
206728 Videojet Plastic Tubing New in Bag
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FESTO PUN6X1 S 1 BL SPIRAL PLASTIC TUBING NEW IN FACTORY BAG
FESTO PUN6X1 S 1 BL SPIRAL PLASTIC TUBING NEW IN FACTORY BAG
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Emerson 40 9709H D 9 Standard Plastic Hood Gray 5 in bag factory sealed
Emerson 40 9709H D 9 Standard Plastic Hood Gray 5 in bag factory sealed
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LumaBase 500100 100 Count Plastic Luminaria Bags White
LumaBase 500100 100 Count Plastic Luminaria Bags White
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Qty 100 Tamper Evident Plastic Bank Deposit Bags 53849 1 Pocket 9 x 12
Qty 100 Tamper Evident Plastic Bank Deposit Bags 53849 1 Pocket 9 x 12
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100pcs 1 1 2 x 1 1 2 Zip Lock Plastic Bags Storage Jewerly Parts Gold Nuggets
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200pcs 3 x 3 Zip Lock Plastic Bags Storage Jewerly Parts Gold Nuggets
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100pcs 3 x 3 Zip Lock Plastic Bags Storage Jewerly Parts Gold Nuggets
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NOS OEM Genuine Hyster Switch 88388 w Broken Plastic Rocker on Top Unopened Bag
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New Clear Plastic Bags 22x52x003 Qty Of 14 11 With 250 roll  3 With 200 roll
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HILLSIDE PLASTICS bags 150 roll extra large 38 x 65 x 003 Blue
HILLSIDE PLASTICS bags 150 roll extra large 38 x 65 x 003 Blue
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NEW IN OPENED PLASTIC BAG EFECTOR IF0284 IFA2002 BBOW SL LS 100AK SENSOR
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Plymor 10 x 13 2 Mil Pack of 500 Zipper Reclosable Plastic Bags
Plymor 10 x 13 2 Mil Pack of 500 Zipper Reclosable Plastic Bags
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Plymor 5 x 8 2 Mil Case of 4000 Zipper Reclosable Plastic Bags
Plymor 5 x 8 2 Mil Case of 4000 Zipper Reclosable Plastic Bags
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Blum 8mm Plastic Dowels Bag of 100 NEW
Blum 8mm Plastic Dowels Bag of 100 NEW
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PLASTIC TEFLON STEM 10020641 NEW IN BAG A367
PLASTIC TEFLON STEM 10020641 NEW IN BAG A367
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NEW IN BAG ALLEN BRADLEY CONTACT BLOCKS WITH PLASTIC LATCH 800F PQ11
NEW IN BAG ALLEN BRADLEY CONTACT BLOCKS WITH PLASTIC LATCH 800F PQ11
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Manual U Shape Sausage Clipper Clipping Machine For Plastic Bag Fruit Bag Ect
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Disposoware D7OZPPC1200 7oz PP Plastic Cups 100 Bag 12 Bags Case 2DAY SHIP
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General Hydroponics CocoTek Basket Liner 8 Inch Bag of 10
General Hydroponics CocoTek Basket Liner 8 Inch Bag of 10
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Qty 1 Box of 250 36 x 44 16 Brown Plastic Bags Gaylord covers P N 30283 33
Qty 1 Box of 250 36 x 44 16 Brown Plastic Bags Gaylord covers P N 30283 33
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SIEMENS NBK 3 PRESS IN NUMBER KIT NEW IN FACTORY BAG
SIEMENS NBK 3 PRESS IN NUMBER KIT NEW IN FACTORY BAG
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NEW LOT OF 4 Cajon Swagelok 316L 8 ATW 6 4P with Original Plastic Bag
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Plasticplace Black 40 45 Gallon Trash Bag 40x46 15 Mil 100 Bags Per Case
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18 x 24 1 mil Clear Plastic Flat Open Poly Bag 100 Pack MagicWater
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Pinnacle Mercantile Plastic Ice Bags with Draw String Closure
Pinnacle Mercantile Plastic Ice Bags with Draw String Closure
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Lot of 3 Ziploc Perfect Portions Freezer Bag 75 Count a box 220 total Plastic
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SPC TECHNOLOGY PS D502 15 PLASTIC COVER 15P NEW IN FACTORY BAG
SPC TECHNOLOGY PS D502 15 PLASTIC COVER 15P NEW IN FACTORY BAG
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Disposoware D7OZPPC1200 7oz PP Plastic Cups 100 Bag 12 Bags Ca Free Shipping
Disposoware D7OZPPC1200 7oz PP Plastic Cups 100 Bag 12 Bags Ca Free Shipping
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MARCO RUBBER  PLASTIC 2 371 NEW IN BAG A392
MARCO RUBBER PLASTIC 2 371 NEW IN BAG A392
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DAVIS EH314004 PLASTIC COVER NEW IN FACTORY BAG
DAVIS EH314004 PLASTIC COVER NEW IN FACTORY BAG
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