Manufacturing process for environmentally friendly paper packaging bag

A manufacturing process for an environmentally friendly paper packaging bag, comprising the following steps:

• S1, cutting a paper sheet to obtain a suitable size;
• S2, performing printing treatment on the paper sheet:
• printing a front side of the paper sheet with a water-based ink, and printing a position, where adhesion is required, of a back side of the paper sheet with a water-based heat-sensitive adhesive by means of multiple flexographic printing units;
• and
• S3, performing high-temperature sealing by hot-pressing to obtain a paper film bag finally;
• wherein a packaging material of the paper packaging bag is only the paper sheet, and the paper sheet is FSC food-grade white kraft paper;
• wherein in the step S2, before printing on the position of the back side of the paper sheet with the water-based heat-sensitive adhesive, the step S2 further comprises preparing the water-based heat-sensitive adhesive, and the water-based heat-sensitive adhesive is prepared from, by mass, the following special components:
• 40-60% of an acrylate emulsion, 20-30% of a water-soluble resin, 1-3% of an emulsifier, and the balance deionized water;
• the acrylate emulsion is divided into two parts, the water-soluble resin and the deionized water are added to one part of the acrylate emulsion and stirred for 10-20 min to obtain a component A, the emulsifier and the deionized water are added to the other part of the acrylate emulsion and stirred for 10-20 min to obtain a component B, and the component B is then dropwise added to the component A to obtain the water-based heat-sensitive adhesive finally.