A blow mold for making PET containers comprising an inner surface corresponding to the outer outline of the container, on which there are one or more cavities or projections configured to make corresponding respective projections or cavities of the outer surface of the container, wherein the mold comprises one or more venting grooves along the edge delimiting said cavities or projections. A plurality of venting holes are possibly arranged along such grooves, as well as it is also possible for some venting holes to be arranged outside thereof. The width and depth of these are selected according to the wall thickness of the container to be blown to prevent that the deformation of the container during the blowing obstructs the venting grooves and leaves visible marks on the container.

Provided are a bottle blowing mold, a bottle blowing machine and a plastic bottle, the bottle blowing mold includes a mold cavity, where a bottle body, a bottle shoulder, a handle and a bottle neck are formed within the mold cavity after a bottle preform is blown, the bottle shoulder is located between the bottle body and the bottle neck, one end of the handle is connected to the bottle shoulder, an other end of the handle is connected to the bottle shoulder or the bottle neck, and a cavity wall of the mold cavity is provided with at least one first rib to have a non-closed or annularly closed first groove is formed on the bottle body.

A mold device includes: a plurality of sets of blow split molds that are disposed side by side in an opening and closing direction, in which one set of blow split mold, when closed, forms a blow molding female mold for blow molding, and, when opened, allows a molding product to be removed therefrom; and an interposed member that is interposed between one set of blow split mold of the plurality of sets of blow split molds and the other set of blow split mold of the plurality of sets of blow split molds in a case where the blow split mold is closed.