Providing a square bottom plastic packaging bag, comprising a bag body comprising a front side (1), a back side (2) and an inner folded side (3) integrally connected to the front side (1) and the back side (2) Each inner folded side (3) forms an outer fold line (8) with the front side (1) and the back side (2), and an inner fold line (9) is formed between the inner fold side surface (3), and a bottom line is arranged at the bottom of the bag body. The bottom edge (5) of the front (1), the back (2) and the inwardly folded side (3) is provided at the lower portion of the bag body such that the inner folded side (3) is bonded to the front (1) and the back (2), respectively. Four mutually independent oblique sealing lines (4) obliquely outward and upward from the bottom sealing line (5), characterized in that the lower end of the oblique sealing line (4) is outwardly curved. When used, the stress concentration at the intersection of the inner fold line and the bottom seal line can be effectively eliminated, and the cost of the package bag can be reduced. When the package bag is processed, the processing of the oblique seal line can be easily realized correctly, and the processing quality of the package bag can be improved.
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Jinan Huancheng Heating Equipment Manufacturing Co., Ltd. , https://www.globalstove.com