Method for in-mold cutting of thick-wall multi-layer blow molding pipe

The invention relates to the field of mold blow molding, in particular to a method for cutting a thick-wall multi-layer blow-molded pipe in a mold. A method for in-mold cutting of a thick-wall multi-layer blow molding pipe comprises the following specific steps that S1, a material blank in a molten state is introduced into a mold cavity of an upper mold and a mold cavity of a lower mold, and an air blowing needle and an air returning needle are controlled to be inserted into the two ends of the mold cavity; and S2, a to-be-cut multi-layer blow molding pipe is subjected to blow molding in the mold cavities of the upper mold and the lower mold, and a first blowing needle false head and a second blowing needle false head are arranged at the two ends of a blow molding pipe blank. According to the method for in-mold cutting of the thick-wall multi-layer blow molding pipe, the blank false head can be conveniently and rapidly cut, rapid cooling can be conducted at the position needing to be cut, cooling is conducted