Electric sequential co-extrusion to blow in the K molding

The new UMA 12 SeCo2 EnergiaZero combines some of the concepts of the traditional sequential Uniloy co-extrusion, as it is the use of injectors instead of extruder and preacumuladores, with the most advanced electric technologies. The closing unit has a strength of 12 tonnes in a configuration without columns.

Despite relatively small dimensions of the plates portamoldes, it can accommodate large moulds which exceed the height of the plates. The movement of opening/closing occurs by a servo motor through a knee, resulting in a very low power consumption (virtually zero during the phase of blown, it is the longest cycle).

For the first time, all the fully electric injectors are used to generate a sequenced parison of two materials in a blowing machine. The UMA 12 SeCo2 EnergiaZero both the rotation of the spindle and the sequence of thrust are caused by electric servos with tape and a great reduction of the consumption of energy and noise compared to hydraulic or hybrid versions. In addition, fully electric injectors allow thrust sequence combining precision and repeatability, which translates into a perfect control of the transition zone between two resins in the parison (one of the most important features in the process of sequential coextrusion).

The configuration in V of the nozzles, which characterizes all Uniloy Milacron machines for the sequential co-extrusion, also contributes to a more sensitive control of the thrust of the parison, minimizing the route of the resin between injectors and head. In addition, when compared to a configuration with extruder and preacumuladores, the injectors provide several advantages: a tour of the resin without loss of material, a more rapid purge, lower consumption of energy and a simple maintenance.

In any process of extrusion - blown head plays a fundamental role in the quality of the parison and, consequently, the quality of articles blown. The work is even more critical when two different resins with different behaviors should be sequenced quickly and accurately through a single head.

W. Müller GmbH, leader in blow molding heads, has been developed exclusively to Uniloy Milacron Srl, the sequential co-extrusion head installed in the UMA 12 SeCo2 EnergiaZero. This includes the new device Radial Parison Variation (RPV) for the asymmetric control of the thickness of the parison (to compensate for the different degree of drawing between the interior and the exterior of the curves in the ducts). This device, a patent of w. Müller, is extremely compact, and is provided with electrical servo for the first time.

Not use hydraulic power to the movements of the machine. This new model has with the logo 'EnergiaZero', which identifies all the fully electric blowers Uniloy Milacron Srl. In this logo the infinity symbol refers to energy recovery and reusable sources.

A blower is, first of all, a tool to produce plastic parts, which will be used by operators of a more simple and effective way. This is the reason why innovation should never go without attention to ergonomic aspects, to make daily operations are simple and comfortable.

These criteria have also been taken into account in the design of the new UMA 12 SeCo2 EnergiaZero. For example, there are no obstacles on the ground under the closure of the mold to make access faster and safer. All cabling and tubes are directed precisely so that they are not an obstacle when cleaned the area below the closure. All valves requiring adjustments during the cycle of the machine are located in appropriate positions so that they work without stopping the production of the machine. The new machine also has the automatic positioning of the head: electric motors move automatically injectors and the whole of the head to the correct position above the mold.