Abstract: A production method for blowing a container starting from a parison comprising the steps of: i) positioning a parison inside a forming mould (2) for forming the container; ii) deforming the parison (10) placed in the mould (2); the step of deforming the parison (10) comprising the sub-steps of: introducing a pressurised fluid into the parison (10) placed in the mould (2); sucking gas which is located inside the mould (2) and outside the parison (10) present in the mould (2).

Abstract: A method for increasing the injection speed of a melted plastic injection device for injecting said melted plastic into a molding cavity (51), said injection device comprising a first cylinder (1) provided with a tubular casing (2) defining a first inner diameter d1, and a first piston (3) slidable inside said tubular casing (2), adapted to be loaded with melted plastic and to inject said melted plastic toward the molding cavity (51); a second cylinder (21) constrained to the first cylinder (1) and provided with a second piston (23) which rod (24) is connected to the first piston (3) and is adapted to actuate said first cylinder (1) during an injection operation; the method comprising the steps of: —releasing second cylinder (21) and first cylinder (1) by extracting the first piston (3) from the tubular casing (2); —coaxially inserting a tubular body (12), defining a second inner diameter d3 which is smaller than the first inner diameter d1, into the tubular casing (2); —disconnecting the first piston (3) fro

Abstract: A method for increasing the injection speed of a melted plastic injection device for injecting said melted plastic into a molding cavity (51), said injection device comprising: —a first cylinder (1) provided with a tubular casing (2) defining a first inner diameter d1, and a first piston (3) slidable inside said tubular casing (2), adapted to be loaded with melted plastic and to inject said melted plastic toward the molding cavity (51); a second cylinder (21) constrained to the first cylinder (1) and provided with a second piston (23) which rod (24) is connected to the first piston (3) and is adapted to actuate said first cylinder (1) during an injection operation; the method comprising the steps of: —releasing second cylinder (21) and first cylinder (1) by extracting the first piston (3) from the tubular casing (2); —coaxially inserting a tubular body (12), defining a second inner diameter d3 which is smaller than the first inner diameter d1, into the tubular casing (2); —disconnecting the first piston (3) f

Abstract: The invention relates to an apparatus for cooling a plurality of preforms made of thermoplastic material which continuously move on a conveyor belt. The apparatus includes a cylindrical casing with a vertical extension formed by two coaxial cylinders, such a casing contains a guide crossed by a chain or a cable for transporting the preforms therein. The guide, which forms a closed path, comprises a first helical stretch, which raises from the lower plane starting from a station in which the preforms coming from a conveying device are hooked by the chain or by the cable, a second straight stretch, which returns the preforms to the lower plane once they have reached the upper plane, and a third flat stretch at the height of the lower plane, which returns the preforms to the arrival station. The helical stretch of the guide is contained within a cooling tunnel formed in the gap between the two walls of the outer cylinder and the inner cylinder of said casing.

Abstract: A plant for the production of containers made of PET comprises at least one rotary carousel for the production of preforms (2) and at least one zone, in which the preforms are either stored or they may be blown on another rotary carousel. The molded preforms are extracted from the carousel (2) by means of a transfer starwheel (50) provided with grippers (4) capable of performing complex translating-rotating type movements and independent grasping movements. The grippers (4) are provided with two suction jaws (90a and 90b) to make the grasping of the preforms more reliable when they are released from the rotary carousel for the production of the preforms (2).

Abstract: An injection mold of a plastic preform includes first, second and third parts, the third part having a molding cavity defining an axis and adapted to be fixed to a first surface of a mold frame; the second part between the first and third parts slides along the axis to close or open the cavity. The first part includes a rod that slides along the axis through a second surface of the frame. The second part includes: a guiding cage through which the longitudinal rod can slide; a structure; and parallel guiding rods extending to the structure; an assembly sliding inside the cage; and a punch sliding inside the structure and defining a first complementary component of the cavity; wherein the structure defines, together with the punch, a cam system for opening or closing two half-collars which define, when closed, a second complementary component of the cavity.

Abstract: An injection-compression plant for manufacturing PET performs comprises an extruder (1) to produce a melted resin, a distribution joint (3) for distributing the melted resin from the extruder (1) towards the injection-compression molds (9?, 9?, 9?), gathered in modular groups of three on supporting frames (21) arranged about the peripheral surface of the rotary carousel (2). The joint (3) allows to transfer the fluid thermoplastic resin from the stationary channel (10) of the extruder (1) to the lateral feeding conduit (27) of each molding module (9), said lateral feeding conduit being rotating with the carousel (2). The injection-compression molds (9?, 9?, 9?) have the two half-molds forming the molding cavity (41?, 41?, 41???) connected by means of bayonet couplings to the frame (21). The molded preforms are extracted from the carousel (2) by means of a wheel (50), which transfers them to an air cooling device (51).

Abstract: A rotary joint for transferring melted plastic from at least one extruder to a plurality of molds of a rotary machine for molding preforms, the joint comprising a fixed structure (3?) provided with a fixed longitudinal element (23) therein, defining a longitudinal axis (Y), and a movable structure (3?) which can rotate about said axis (Y) and is adapted to be integrally fixed to the rotary machine; wherein a first passage channel (11) is provided within said fixed element (23); wherein a second passage channel (11?) is provided within said movable structure (3?) and coaxial to said first passage channel; said second passage channel (11?) being in communication at a first end thereof with said first passage channel (11), and being in communication at a second end thereof with a plurality of lateral radial channels (52) provided within said movable structure (3?); wherein there is provided, between the fixed structure (3?) and the movable structure (3?), a gap in which a spiral seal (24) is arranged for ensurin

Abstract: A plant for the production of containers made of PET comprises at least one rotary carousel for the production of preforms (2) and at least one zone, in which the preforms are either stored or they may be blown on another rotary carousel. The molded preforms are extracted from the carousel (2) by means of a transfer starwheel (50) provided with grippers (4) capable of performing complex translating-rotating type movements and independent grasping movements. The grippers (4) are provided with two suction jaws (90a and 90b) to make the grasping of the preforms more reliable when they are released from the rotary carousel for the production of the preforms (2).

Abstract: The invention relates to an apparatus for cooling a plurality of preforms made of thermoplastic material which continuously move on a conveyor belt. The apparatus includes a cylindrical casing with a vertical extension formed by two coaxial cylinders, such a casing contains a guide crossed by a chain or a cable for transporting the preforms therein. The guide, which forms a closed path, comprises a first helical stretch, which raises from the lower plane starting from a station in which the preforms coming from a conveying device are hooked by the chain or by the cable, a second straight stretch, which returns the preforms to the lower plane once they have reached the upper plane, and a third flat stretch at the height of the lower plane, which returns the preforms to the arrival station. The helical stretch of the guide is contained within a cooling tunnel formed in the gap between the two walls of the outer cylinder and the inner cylinder of said casing.

Abstract: A rotary joint for transferring melted plastic from at least one extruder to a plurality of molds of a rotary machine for molding preforms, the joint comprising a fixed structure (3?) provided with a fixed longitudinal element (23) therein, defining a longitudinal axis (Y), and a movable structure (3?) which can rotate about said axis (Y) and is adapted to be integrally fixed to the rotary machine; wherein a first passage channel (11) is provided within said fixed element (23); wherein a second passage channel (11?) is provided within said movable structure (3?) and coaxial to said first passage channel; said second passage channel (11?) being in communication at a first end thereof with said first passage channel (11), and being in communication at a second end thereof with a plurality of lateral radial channels (52) provided within said movable structure (3?); wherein there is provided, between the fixed structure (3?) and the movable structure (3?), a gap in which a spiral seal (24) is arranged for ensurin

Abstract: An injection-compression plant for manufacturing PET performs comprises an extruder (1) to produce a melted resin, a distribution joint (3) for distributing the melted resin from the extruder (1) towards the injection-compression molds (9?, 9?, 9?), gathered in modular groups of three on supporting frames (21) arranged about the peripheral surface of the rotary carousel (2). The joint (3) allows to transfer the fluid thermoplastic resin from the stationary channel (10) of the extruder (1) to the lateral feeding conduit (27) of each molding module (9), said lateral feeding conduit being rotating with the carousel (2). The injection-compression molds (9?, 9?, 9?) have the two half-molds forming the molding cavity (41?, 41?, 41??) connected by means of bayonet couplings to the frame (21). The molded preforms are extracted from the carousel (2) by means of a wheel (50), which transfers them to an air cooling device (51).

Abstract: An injection mold (9?) of a plastic preform comprising a first part (12) and a second part (13), fixed to each other, and a third part (14); wherein the third part (14) is provided with a molding cavity (41?) defining an axis (Y?) and is adapted to be integrally fixed to a first surface of a supporting frame of the mold; wherein the second part (13), arranged between the third part and the first part, is adapted to slide along said axis to close or open the cavity; wherein the first part (12) comprises a longitudinal rod (55) adapted to slide along said axis (Y?) through a second surface of the supporting frame, opposite to and spaced apart from the first surface; wherein the second part (13) is provided with: —a guiding cage comprising a first plate (18), provided with a through hole through which the longitudinal rod can slide and configured to abut on said second surface; a structure (18?); parallel guiding rods (16) fixed at a first end thereof to said first plate and fixed at a second end thereof to the

Abstract: A heated blow mold for the thermostabilizing treatment, or the heat-set process, where at least a heating system is housed between the mold (2) and mold holder (3). Said system consists of a set of tubular electric resistors, which are parallel to the generator of the mold and of the item to be molded, connected to each other by additional electric resistors, which are basically transversal in relation to the first resistors and placed in areas requiring greater heat.

Abstract: A heated blow mould for the thermostabilizing treatment, or the heat-set process, where at least a heating system is housed between the mould (2) and mould holder (3). Said system consists of a set of tubular electric resistors, which are parallel to the generator of the mould and of the item to be moulded, connected to each other by additional electric resistors, which are basically transversal in relation to the first resistors and placed in areas requiring greater heat.