Slant clip soft-package production method and special die thereof

The invention relates to a method and a special mould for manufacturing soft packing bags with an oblique clipping mouth. The method comprises: a, a step of heat sealing, in which a fourth side edge of a packing bag is sealed by heat partially to form an open section and a semi-sealed section, and the first side edge, the second side edge and the third side edge are sequentially connected with the semi-sealed section of the fourth edge; b, a step of cutting an oblique edge to form an oblique opening, in which the oblique opening and the open section on the fourth side edge of the bag body form an opening part with a curve; c, a step of mouth filling; d, a step of secondary heat sealing, in which the opening part and the mouth are sealed by heat and welded at the same time; and e, a step of filling materials through the mouth and well screwing a cap. The special mould comprises a parallel section and an oblique angle section which form the same angle with the open section and the oblique edge section with the oblique opening and a groove which is arranged on the oblique angle section and allows an upper haft part of the mouth to be inserted into. The invention aims to overcome the drawbacks of the prior art and provides a quick and convenient method for manufacturing soft packing bags with an oblique clipping mouth and a special mould used by the method during manufacture.