S.i.p.a. Societa' Industrializzazione Progettazione E Automazione S.p.a.

S.i.p.a. Societa' Industrializzazione Progettazione S.p.a.

Siapi S.r.l.

S, I.p.a. Societa Industrializzione Progettazione E Automazione S.p.a.

Michele Varaschin

Matteo Zoppas

Alberto Armellin

Sandro Serra

Stefano Tonti

Giovanni Chiarotto

Mirco Tonon

Giancarlo Besa

A production method for blowing a container starting from a parison comprising the steps of: i) positioning a parison inside a forming mould () for forming the container; ii) deforming the parison () placed in the mould (); the step of deforming the parison () comprising the sub-steps of:

Method and system for blowing a parison

A method for increasing the injection speed of a melted plastic injection device for injecting said melted plastic into a molding cavity (), said injection device comprising a first cylinder () provided with a tubular casing () defining a first inner diameter d, and a first piston () slidable inside said tubular casing (), adapted to be loaded with melted plastic and to inject said melted plastic toward the molding cavity (); a second cylinder () constrained to the first cylinder () and provided with a second piston () which rod () is connected to the first piston () and is adapted to actuate said first cylinder () during an injection operation; the method comprising the steps of: &#x2014;releasing second cylinder () and first cylinder () by extracting the first piston () from the tubular casing (); &#x2014;coaxially inserting a tubular body (), defining a second inner diameter dwhich is smaller than the first inner diameter d, into the tubular casing (); &#x2014;disconnecting the first piston () from the rod (); &#x2014;connecting a third piston () to the rod (), said third piston () being sized to slide inside said tubular body (); &#x2014;constraining second cylinder () and first cylinder () by inserting the third piston () into the tubular casing ().

Method for increasing the injection speed of a plastic injection device

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. The cooling air is conveyed within the cooling tunnel by a specific manifold which is located within the casing.

Post-molding cooling apparatus for preforms made of thermoplastic material

A plant for the production of containers made of PET comprises at least one rotary carousel for the production of preforms () 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 () by means of a transfer starwheel () provided with grippers () capable of performing complex translating-rotating type movements and independent grasping movements. The grippers () are provided with two suction jaws (and) to make the grasping of the preforms more reliable when they are released from the rotary carousel for the production of the preforms ().

Grippers for thermoplastic containers

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:

Injection mold of a plastic preform

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

Injection compression apparatus for manufacturing thermoplastic containers

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 (') provided with a fixed longitudinal element () therein, defining a longitudinal axis (Y), and a movable structure (&#x2033;) which can rotate about said axis (Y) and is adapted to be integrally fixed to the rotary machine; wherein a first passage channel () is provided within said fixed element (); wherein a second passage channel (&#x2032;) is provided within said movable structure (&#x2033;) and coaxial to said first passage channel; said second passage channel (&#x2032;) being in communication at a first end thereof with said first passage channel (), and being in communication at a second end thereof with a plurality of lateral radial channels () provided within said movable structure (&#x2033;); wherein there is provided, between the fixed structure (&#x2032;) and the movable structure (&#x2033;), a gap in which a spiral seal () is arranged for ensuring the action of sealing the melted plastic between said fixed structure and said movable structure.

Rotary joint for transferring melted plastic

A heated blow mold for the thermostabilizing treatment, or the heat-set process, where at least a heating system is housed between the mold () and mold holder (). 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.

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Vittorio Veneto, Italy

Michele Varaschin