where to buy plastic grocery bags

120 pcs/package  orcustomized

12 pcs/bail, each package 10 designs .

100 pcs.ctn or customized

10 pcs/polybag or customized

How Are Plastic Shopping Bags Made?

Almost all plastic shopping baggage are made from polyethylene, a petroleum-derived polymer. Two special sorts of polyethylene are in use today: low density and excessive density, with high density polyethylene being the most common.

The process used to manufacture plastic shopping baggage is referred to as blown movie extrusion. First, polyethylene beads (or resin) are loaded into a hopper, which deposits resin into the barrel, which also contains a screw. As the screw motor turns the screw, the resin is pushed at a normal fee thru the barrel. The barrel is heated, which reasons the plastic beads to soften into the desired state. In addition, high levels of strain and friction within the barrel make a contribution to resin melting.

At the barrel's end, a display pack (generally bolstered with a breaker plate due to excessive pressures) is employed to screen out any unwanted contaminants. Next, the molten polymer passes into the die, which in this example is an upward-orientated cylinder. Two nip rolls are located excessive above the die and pull the plastic up at a controlled speed. Depending on the speed of spooling, one of a kind bag thicknesses may be achieved. An air ring is located round the outdoor profile of the die, and serves to cool the plastic film. In addition, the center of the die includes a nozzle which blows air into the plastic film, growing a bubble. This system blows up the plastic film; the ratio of the new length to the die diameter is known as the "blow-up ratio." Finally, the nip rolls compress the film back right into a double-walled movie, and the film is stored. Once the movie is cooled, it could be similarly processed into bags, with trademarks or handles as required.