The invention provides a mould core and injection moulding apparatus for the production of a preform using a mould core which in the zone for defining the neck part of the preform comprises a combination of a raised portion and a shallow groove with a depth of 0.01 to 1 mm provided in the raised portion, for defining an internal attachment means in the neck of the preform. The invention also provides a preform and a container made from the preform, with internal attachment means in the neck. The internal attachment means is carried out rotation symmetrically with respect to the longitudinal axis of the preform. The combinations with an insert piece, preferably a pouring spout, flexible hose or dosing cap, have also been described. Furthermore, the invention provides an injection moulding method for the preform production and a stretch blow moulding method for the container production.

A preform configured to be blow-molded into a plastic bottle includes a neck section defining an opening, the neck section including a threaded portion configured to engage a closure, and a neck ring, a transition section having a first end positioned adjacent to the neck ring and a second end opposite the first end, a cylindrical body section extending from the second end of the transition section to a base, and a longitudinal axis extending from the opening through the base. The neck section, transition section, and the body section define a hollow channel positioned between the opening and the base. The transition section defines a tapered sidewall relative to the longitudinal axis, the tapered sidewall decreases a cross-sectional diameter of the hollow channel. The tapered sidewall of the transition section contains 20% to 30% of a total weight of the preform.

The invention provides a mould core and injection moulding apparatus for the production of a preform using a mould core which in the zone for defining the neck part of the preform comprises a combination of a raised portion and a shallow groove with a depth of 0.01 to 1 mm provided in the raised portion, for defining an internal attachment means in the neck of the preform. The invention also provides a preform and a container made from the preform, with internal attachment means in the neck. The internal attachment means is carried out rotation symmetrically with respect to the longitudinal axis of the preform. The combinations with an insert piece, preferably a pouring spout, flexible hose or dosing cap, have also been described. Furthermore, the invention provides an injection moulding method for the preform production and a stretch blow moulding method for the container production.

A preform configured to be blow-molded into a plastic bottle includes a neck section defining an opening, the neck section including a threaded portion configured to engage a closure, and a neck ring, a transition section having a first end positioned adjacent to the neck ring and a second end opposite the first end, a cylindrical body section extending from the second end of the transition section to a base, and a longitudinal axis extending from the opening through the base. The neck section, transition section, and the body section define a hollow channel positioned between the opening and the base. The transition section defines a tapered sidewall relative to the longitudinal axis, the tapered sidewall decreases a cross-sectional diameter of the hollow channel. The tapered sidewall of the transition section contains 20% to 30% of a total weight of the preform.