People's awareness of environmental protection still needs to be improved. When you go to the supermarket to shop, you can bring your own environmentally friendly shopping bags, which can be reused and reduce the use of plastic bags. In general, what requirements do the production of environmentally friendly shopping bags need to meet to be qualified?
For general dry goods, it is recommended to use national waste or European waste, and control the production of base paper according to the technical indicators of A or B grade kraft cardboard paper. The surface layer can be noodles or not, depending on whether complex patterns and advertisements are printed. The basis weight of the paper sheet can be 135~150g/m2. The 25×20×15cm paper bag can bear a weight of 8~15kg.
Need to withstand goods with a certain amount of moisture
You can also use whole waste paper. Only on the basis of the above standards, add a certain amount of wet strength agent 0.5~1.0%, the wet strength can reach 10~15% of the dry strength.
Meat or other wet goods
The same can choose to use all waste paper to make shopping bags. This requires adding an environmentally friendly oil repellent to the pulp or coating the surface during the papermaking process. It is also possible to spray water-soluble or degradable resin twice on the kraft cardboard paper with good surface strength.
Many manufacturers in Mainland China have developed all-waste paper reinforced paper. That is, during papermaking, water-soluble yarn is added between the two layers of sizing material in combination with the spinning principle. One layer of this kind of paper can reach the strength of four layers of kraft paper, which can completely replace ordinary cement bag paper. Similarly, single-layer paper can be used on shopping bags.
