Rotary stretch-blow moulders for PET bottles


EBS 6 KL ERGON - Rotary stretch-blow moulders with output rate up to 15,000 bph

Starting from the countless technical innovations introduced on the stretch-blow moulders from the EBS K ERGON range, SMI designers have developed a new series of compact rotary stretch-blow moulders called EBS KL ERGON (the letters KL stand for"Kompakt Large"), suitable for meeting production requirements up to 25,000 bottles/hour.

The new models are available from 4 to 10-cavity versions for the production of PET / rPET / PP / PLA up to 3 liters.

The EBS KL ERGON series of rotary stretch-blow moulders ensures high performances in the stretch-blow moulding of bottles, mainly used in the food & beverage sector. The high technological content, the very low running and maintenance costs, as well as the great quality/price ratio make the EBS KL ERGON series the ideal solution for producing plastic containers of different capacities, featuring various shapes, both simple and complex.

Max. output (BPH)10000150002000025000
Bottle sizemin Ø = 44 mm
max Ø = 120 mm
min Ø = 44 mm
max Ø = 120 mm
min Ø = 44 mm
max Ø = 120 mm
min Ø = 44 mm
max Ø = 120 mm



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.


3Preforms stretch-blow moulding
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) into 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 operations easily and safely; furthermore, even the upper parts of the blow moulder can be easily accessed, without using ladders
  • The carousel of the stretch-blow moulder is equipped with motorized stretch rods controlled by electronic drives and do not require pneumatic cams, as the servomotor automatically adjusts depending on the production speed
  • Cam-free technology that makes it possible to change the stretch speed without mechanical intervention (switching cams) and to considerably reduce the vibration stress on the blowing carousel compared to traditional solutions
  • The stretch-blow moulding system uses high-performance, low dead-volume valves that allow a reduction in pre-blowing and blowing time and, at the same time, in dead volume by 50%
  • The mould mechanical unit 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-holding unit
  • The tunnel inner part is equipped with a new system with diffusers, without spheres and with gaskets, for the heat dissipation that enables to significantly reduce the wear of the components
  • The tunnel ventilation system, based on a series of high-capacity centrifugal fans, significantly reduces the temperature of the preform neck, thus
    allowing a wider process window, a thickness optimization, the absence of ovalization and the deformation of the preform neck and ring
  • All mechanical, electrical and pneumatic connections are placed in a single area inside the machine frame, where utilities connections are tidily and optimally positioned
  • The double-stage system for the recovery of high pressure compressed air is installed as standard equipment on all models
  • The compressed air management system is characterized by a very compact design, it is well visible, accessible, simplified, integrated and standardized
  • The water system is managed by means of a flow meter and a thermometer and enables to know in every moment the amount of flow and the temperature of each cooling system
  • Posyc® operator interface, simple and intuitive, uses an advanced management and diagnostic software in terms of production efficiency, energy saving and predictive monitoring
  • Very competitive quality-price ratio

Ultra-compact solution

The preform heating section (tunnel) is integrated with the stretch-blow moulding section (carousel) into a single, extremely compact module, that makes the system suitable for installation even on small bottling lines. Thanks to its compactness, the stretch-blow moulder can be easily transported and the installation and start-up operations can be performed in about two days of work.

Rotary stretch-blow moulding system

High-efficiency rotary stretch-blow moulding system equipped with motorized stretch rods, whose functioning, controlled electronically, does not need pneumatic cams. This allows a precise management of the rod path and an accurate control of its position, as well as a significant energy saving.

High quality of the bottles produced

The stretch-blow moulding system uses high-performance low dead volume valves, that allow to reduce pre-blowing and blowing times, with advantages in terms of machine performance and quality of the bottles produced.

Reduction in consumption

Thanks to the preform heating module, equipped with high-energy efficiency IR lamps, to thermo-reflective panels with ceramic elements and to stretch-blow moulding module equipped with a double stage air recovery system, energy costs are reduced.

Safe and easy cleaning and maintenance operations

SMI stretch-blow moulders, characterized by a compact and ergonomic structure, are equipped with slightly rounded safety doors; this allows to have more space inside the machine in order to carry out cleaning and maintenance operations easily and safely.

Optimized automation and control

The plant is controlled by Motornet System® automation and control technology that ensures the constant maintenance of optimum parameters during the whole production cycle and the direct change of the machine settings, thus simplifying the format changeover operations.

Quick format changeover

The format changeover operations are quick thanks both to the control system the down motion preform feeding tunnel is equipped with and to the system that adjusts the distance between the heating and the cooling module.

Precise adjustments

Adjustments are extremely precise; such precision is guaranteed in the tunnel by the new system for adjusting the distance between the heating and the cooling module, controlled by a hand wheel and by a numerical counter, and in the stretch-blow moulding carousel by electronic drives that control the stretch rod.

Low wear

The reduction of the wear of the components is ensured by a new motion system of the grippers, based on the preform/bottle grippers without springs equipped with desmodromic cams, by the use of plastic bearings and by the new system of diffusers, without spheres and with gasket, of the preform gripping spindle.

Images are for illustrative purposes and data are not binding, as they have to be confirmed by SMI according to the container weight and capacity, machine user's production conditions and technical specifications.