Characteristics Of Physical And Chemical Properties Of OPP Printing Plastic Bags

The physical property of OPP printing plastic bags is that the printing ink in the image part is completely a stacked load, while the non image part is concave or convex, which is different from the height of the image part and cannot be touched with the printing ink, leaving it blank. Therefore, the transfer of the printing ink in the image part onto the printed material is only a physical and mechanical action. Generally, relief printing, intaglio printing, hole printing, and dry lithography printing are physical printing (the printing surface is higher or lower than the non printing surface).

"The chemical property of OPP printing plastic bags is that the non adhesion of the non imprinted part (non printing surface) of the printing plate to the printing ink is not caused by the concavity, protrusion, or shielding of the part, but by chemical action that produces a water absorbing and ink repellent film.". Although it is still a physical phenomenon that the image free portion (printing surface) absorbs ink and water, while the non image free portion absorbs water and repels ink, and the water and grease are reversed. However, during the printing process, it is necessary to constantly supplement the non image free portion with a water and ink repellent film, so it is chemical printing. The printing of lithographic rubber presses belongs to this category. In order to keep the non printing surface of the printing plate from being contaminated by grease, it is necessary to add analogues and adhesives to the water tank solution to supply a source of carboxylic group mucus layer.

Plastic products can not only be degraded in the garbage dump after being discarded, but also can be degraded after being implanted into the human body. They also have no toxic side effects, and will not produce inflammation and other rejection phenomena, which makes this plastic have a great application prospect in biomedicine, such as being able to make absorbable medical sutures, as well as removable temporary stents or catheters.
The plastic made of this PHA has an average degradation time of one and a half years. If placed on a shelf or in a cabinet, it can be stored for longer periods of time. But if they are thrown into landfills, compost piles, or even the ocean, they will degrade quickly and leave no harmful substances behind. According to statistics, there are 100 million tons of non degradable plastic floating in the North Pacific Ocean, endangering marine life and damaging the food chain. The application of this new technology is expected to significantly reduce the environmental damage caused by plastics.