Method and apparatus for compression moulding preforms for synthetic resin containers

An apparatus for compression moulding preforms for synthetic resin containers by inserting under pressure a mould punch (15) into a die cavity (20a) loaded with a charge (8), the preforms comprising an upper neck (91) provided with projections and a hollow body (92) lying below the neck (91), the apparatus comprising a plurality of first die components (21), each arranged to form the outer surface of the hollow body (92) of the preform (9), said first die components (21) being operated by inserting said punch (15) under pressure into each of them, to compression mould the preform (9), characterised by comprising:

• an equal plurality of second die components (22), each arranged to form the outer surface of the neck (91), each being associated with and secured to the first die component (21) during the step of feeding the charge (8) into the die cavity (20a), said second component (22) being divided into at least two sectors (23), to be drawn apart to extract the preform (9), and means to withdraw the second die component (22) from the first die component (21) during the step of extracting the preform from the die.

8-16. (canceled)

(canceled)

An apparatus for compression moulding preforms for synthetic resin containers by inserting under pressure a mould punch (15) into a die cavity (20a) loaded with a charge (8), the preforms comprising an upper neck (91) provided with projections and a hollow body (92) lying below the neck (91), characterised by comprising a plurality of mutually independent shuttles, movable independently of each other, each shuttle comprising:

• a first die components (21), arranged to form the outer surface of the hollow body (92) of the preform (9), a second die components (22), arranged to form the outer surface of the neck (91), associated with and secured to the first die component (21) during the step of feeding the charge (8) into the die cavity (20a), said second component (22) being divided into at least two sectors (23), to be drawn apart to extract the preform (9), said shuttles being able to be operated by inserting said punch (15) under pressure into each of them to compression mould the preform (9).

A shuttle as claimed in claim 12, characterised in that each sector (23) is joined to a pair of sliders (24) constrained to slide along respective guides (25).