Recently, I asked a lot of questions about how to make plastic bags. This will take a lot of time. Secondly, it will be impatient to repeat the same problem several times. Today, I will sort out the technology. When it is to give you a reference, not enough detailed place also ask peer senior friends to help add.

First of all, plastic bags are plastic bags. The common raw materials of plastics are: PE / PO / PP / OPP / CPP / EVA / PVC / PET; before blowing, these raw materials are from pellets. The plastic particles are blown into a roll of film according to the customized size by high-temperature blowing of the discharging machine. Then go to the printing workshop to print. This step is the most questioned part

For example, first: why do the two-sided printing have the same content, but they have to charge for the copperplate of two plates? Because the film blowing is the cylinder material, so the machine is printing both sides together, so it needs two plates at the same time. This avoids a problem of position and color difference. If it is single sheet printing, we don't need to charge two copperplate fees, but in fact, the cost is the same. Because they are all calculated by the area of the bag, the cost is the same after folded and the area after the showdown is opened.

Second: the problem of color difference, no matter what printing there will be a color difference problem, the reason is that the ink is manually adjusted. The first time and the second time out of the color will certainly be different; we control this color difference at 90%, which is already the industry standard.

Third: printing set, displacement, this is also an inevitable process problem, so his standard in 0-3mm is within the normal range. If the patterns designed by customers are too complicated and strict, we will make suggestions or change the design drawings according to the process.

When the printing is finished, the bag is cut and the finished product is produced. This process is relatively simple. Some with side organ or bottom organ will enter another link to make. Some of the sling or threading process, hand-made is generally to the last process

After these steps, the beautiful plastic bag you see will come out.