Rotary stretch blow moulders for PET bottles

EBS K ERGON series

EBS 2 K ERGON - Rotary stretch-blow moulders with output rate up to 4,400 bph (1 L)

Starting from the countless technical innovations introduced on the ERGON EBS series stretch-blow moulders, SMI designers have developed a new series of ultra-compact, fully electronic, rotary stretch-blow moulders called ERGON EBS K (the letter K of the name comes from the German word "kompakt").

Capable of satisfying production demands of up to 8,800 bottles/hour, the new models are available in 2, 3 and 4-cavity versions, and offer all the advantages of rotary technology in a "speed" range (3,000-4,000 to 8,000-9,000 bottles/hour), traditionally occupied by linear stretchblow moulders.

The EBS K ERGON series of rotary stretch blow-molders ensures high performances in the stretch blow-molding of PET bottles, mainly used in the “food & beverage” sector; thanks to high-tech components, minimized maintenance and operational costs and excellent quality/price ratio, the EBS K ERGON series is the ideal solution for the production of plastic containers of different capacities, featuring various shapes, from the simplest to the most sophisticated ones.

EBS 2 K ERGONEBS 3 K ERGONEBS 4 K ERGON
Max. output (BPH)440066008800
Bottle max. vol.3 L3 L3 L
Cavities234

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1Preforms feeding
The preforms are transferred from the hopper to the unscrambler through a lifting belt; the unscrambler conveys them to an inclined guide, from where they reach the spacing star wheel at the heating module infeed, by gravitational fall. The star wheel feeds the rotary mandrel chain, through which the preforms are “captured” and let into the heating module.


2Preforms heating
Before entering the heating module, equipped with infrared lamps, each preform undergoes accurate checks, which detect its size and vertical position and automatically eliminate the preforms not compliant with the pre-set parameters. The preforms, supported by the mandrels, start moving along the heating module. During the heating process, the preforms constantly turn around themselves, so as to ensure an excellent and symmetrical heat distribution. The heating module is equipped with two different cooling systems: a liquid-fed cooling system, in order to cool the protection ring preventing the preforms thread deformation during the heating process; an air-fed cooling system, in order to keep the temperature inside the heating module as low as to avoid the exposure of the preforms outside walls to too high temperatures. At the heating module outlet, a sensor detects the preform temperature and compares it with the temperature set point; if the two values do not correspond, it increases or decreases the heating module lamps power.


3Preform stretch blow-molding
A special rotary group of grippers picks up the preforms from the oven and sets them into the stretch-blowing stations. The stretch-blowing process includes two phases:
- stretching and pre-blowing, which occur simultaneously through the descent of the motorized stretching rod and the supply of low-pressure compressed air;
- final blowing with high-pressure compressed air, through which the containers take their final shape. A counter-pressure air system ensures the perfect locking of the moulds, whereas the mechanical locking of the mold-holders allows bearing the strengths generated by the stretch-blow moulding process with the maximum reliability. Also the stretch-blowing stations are equipped with a liquid-fed cooling system, which keeps the molds temperature constant.


4Bottles outlet
During the blowing process, an accurate measurement system checks that the process follows the pression profile required. In fact, a pressure drop would alter the container shape which would cause the automatic rejection of the container. The finished bottles are picked from the stretch-blowing stations by another rotary group of grippers and put onto an air conveyor which finally transfers them to the filling machines.


  • The preform heating section (tunnel) is integrated with the stretch-blow moulding section (carousel) in a single, extremely compact module, that makes the system suitable for installation even on small bottling lines
  • The structure that contains the tunnel and the carousel is equipped with slightly rounded safety doors, providing more space inside the machine to perform cleaning and maintenance tasks easily and safely
  • The carousel of the stretch-blow moulder is equipped with motorized stretch rods controlled by electronic drives and do not require mechanical cams
  • Innovative technology that makes it possible to change the stretching speed without mechanical intervention (switching cams) and greatly reduces the vibration stress on the blowing carousel compared to traditional solutions
  • The stretch-blow moulding system uses high-performance, low deadvolume valves that reduce pre-blowing and blowing times, hereby improving efficiency and the quality of the bottles produced
  • The mechanical assembly of the mould is equipped with its own motorization, which ensures the utmost precision for the up/down motion of the mould bottom and the opening/closing of the mould-holder unit
  • The machinery is managed by the MotorNet System® for automation and control, which ensures constant maintenance of optimum processing parameters throughout the entire production cycle and the direct modification of machine settings, thereby simplifying format changeover operations

* Data provided on this page are not binding, as they have to be confirmed by SMI according to the machine user's production conditions and technical specifications.