In the production process of inner liner bags, it is difficult to avoid the phenomenon of tight cloth on both sides and loose cloth in the middle. In fact, don't underestimate the existence of this problem. Once this phenomenon exists, we should deal with it in time. So, what is the reason for the problem of liner bags?
The top of the amplifier is very tense. The resistance of the knee brush increases. The cloth on both sides is relatively large. By pulling the cloth roll, the two sides become tight edges and form the middle cloth. Both sides are tense and loose.
Secondly, when one side of the expander is relatively tight, the four expansion bars of the expander are not tightly connected with the cloth cover, and the cloth on both sides is relatively elongated. The elongated cloth contracts backwards through the upper traction roll, and the two sides become tight edges.
Different printing methods of different types of inner liner bags are different. The process of gravure printing of transparent plastic film with color printing packaging bags and coated non-woven bags is as follows:
Overall analysis. The position and text of the color text should be printed on a white background. The white background can achieve white, and the color needs to be hollowed out. Spot-color printing can make the printing process simpler. If the line content is large in the text, the number of lines can be low.
Make and separate color plates before printing. The color splitter requires a white plate to be used as the background and the corresponding color plate. This can be done in the electronic engraving system, or in the pre-press design system, and then directly engrave the plate in the electronic engraving machine. Specific operation methods:
Firstly, the design of a single inner liner bag is made. According to the size of each element, the text is input by hand, and the color blocks and lines are drawn. Set the appropriate color. After the production is completed, check the size, location, text, and make sure there are no errors. Put the large versions of the works together.
Considering the width of the bag, printer and plastic film, calculate how many bags can be printed in the width direction. According to the diameter of the plate drum, we can put several packages around the plate. Pay attention to the width of the sticky edges between the bags.
Next, engrave the plate on the electronic engraving machine. At the same time, prepare the metal plate. It is important to note that if printed on the plate, the text on the plate and the text on the table are exactly the opposite.
Start printing. Printing on plastic film printing machine, the specific steps are plate making, ink scraper, ink adjustment preparation, winding, ink testing, adjustment and formal printing.
Wrap it with a layer of raw material. In the special film covering machine.
Bag making. In fact, bags are made for bonding. Two layers of film are bonded into a liner bag, sealed on three sides, and then cut into a bag.
The printing process of inner liner bags seems simple, but considering the manufacturer's production process. The quality of liner bags is not only reflected in the material itself, but also in the printing quality.