Plastic bag printing process
Plastic bag production of the formation of plastic film
As we all know, plastic bags are made of plastic film, so how is the formation of the plastic film? This is the first step in the production of plastic bags: blow molding. Blow molding is the purchase of raw material plastic particles through the blow molding machine into plastic film.
The process of plastic bag printing
The premise of plastic bag printing is the plastic film and the plate in place. The previous step speaks of blow molding, the formation of the order specifications of the film, we will proceed to print. According to the required printing pattern first, to make the plate, the general plate and blow molding is synchronized, that is, after the completion of blow molding, the plate should also be made, usually take about 4 days to make the plate.
Plastic bag printing is divided into single-sided or double-sided and color distinction. For example, in supermarket shopping bags, generally single-sided or double-sided one or two colors are most common, the color corresponds to a plate, but not double-sided colors can be the same version, which is not, such as two-sided each color will have to produce four plates. Plastic bag printing is generally gravure, using mostly copper plates, there are also offset plates.
Printing unit to install the plate and roll material, adjust the ink, and you can print.
According to different types of plastic bags, the printed plastic film bag-making method is not the same. There are those that need to be folded, those that need to be laminated, those that need to be cut, those that need to be perforated, and those that need to be welded with carrying handles.
But this step is the final link of plastic bag making, which basically can be shaped.
Here to say a little, plastic bag production processes are separate, and can not guarantee that they can be timely convergence, so a handful of plastic bag production cycles are about 10 days.