Automatic Rotary PET Bottle Stretch Blow Molding Machine
Automatic rotary blowing machine is successfully developed and
researched by our company by absorbing the most advanced bottle
producing technology in the world. It’s mainly made of hopper,
elevating system, lining device, ion air blow dust, oven and
mainframe, electrical controlling system and pneumatic controlling
system.
Bottle blowing chart
(1) Hopper and elevating system
A certain amount of preforms will be stored in hopper to guarantee
the continuous of producing. The preforms will be elevated to the
lining device by the belt of hopper and then sent to the oven along
the filling rail to be further produced.
Description of equipment’s performance:
Once preforms are loaded into the hopper, they are supervised by
the computer. The number of the loading preforms can be
automatically adjusted according to the production speed;
The output speed can be freely adjusted according to different
preforms to make the number of loading preforms match up with the
production speed;
The design of rotary plastic transferring belt ensures preforms
avoiding damage and contamination during the transferring;
After being lined, preforms pass the guiding wheel to the dust
moving device, then to preform seats, and then go into the oven to
be heated. Preforms are heated by seven to ten layers lamps in the
oven, every layer lamps can heat separately. The heating
circulation of the fan in the bottom of the oven make the average
temperature of the inside oven.
(2) Oven
In the oven the preforms move forward and rotate themselves to make
every part of the bottle have the same temperature. After heating,
the preforms have elastomeric property, so the preforms can be
stretched biaxial. For the soft drinking bottles the range of
temperature is 90~100℃, while for hot filling bottles the range is
110~120℃. The heat of the oven is controlled by the quantity of the
working lamps, the whole setting temperature and the power of the
oven.
The structure of oven
The heating control of the infrared lamps adopts the closed loop
control. After setting the temperatures of oven and preforms, the
computer will automatically monitor and ensure the fluctuate of
temperature within the certain value to avoid effecting production
because of the different temperature between day and night;
After being heated, preform will be checked by the automatic
infrared inspector, its temperature will shown on the computer,
which make every preform has the same temperature and further
ensure the stability of the blowing technique and high finished
goods rate;
When the equipment breaks down, the special designed quickly air
cooling device ensures prefroms still staying in the oven be cooled
quickly, thus these preforms can be used again;
The special designed preform ejecting device can eject the
unqualified performs.
(3) Mainframe of blowing machine
After being heated in the oven, the preform will be transferred
into the mold by transfer arm. The preform will be sealed by
sealing seat, stretched by stretching seat and blown by low
pressure air and high pressure air (hot filling bottle will blown
by cooling air). According to different technical requirements, the
mold will be cooled by cooling water if blows cold filling bottle,
the mold will be heated by hot oil if blows hot filling bottle. The
whole production process will be monitored by computer.
Bottle’s checkup and output
After being blown, bottle will be transferred out of mold to output
rail which can be connected with the air conveyor of the filling
production line. Or bottle will be directly transferred on the
conveyer belt to the bottle storehouse.
Working theory of bottle blowing machine
The main cam will rotate in high speed. The rotary angle will be
tested by the coder on the top of the equipment and the sensor
installed on the main cam. Then the information will be sent back
to the computer which will send message to the solenoid valve
according to the program settled by the operator. The certain
action will be carried out to blow in the certain time to finish
the double oriented method blowing technique during the rotary of
the machine and the conforming bottles will be produced.
(4) Drive and synchronization system
Drive and synchronization system
Setting the speed on the control panel → PCC(programmable control
system) → transducer → main electric motor → gear box → belt wheel
→ toothed belt → speed cam and preform transfer belt wheel → oven
belt wheel and bottle transfer belt wheel → preform filling wheel
and bottle produced cam
(5) Special mold frame system
The special designed mold frame system ensures the possibility of
quick and accurate changing mold;
Mold frame with air pressure balance device makes the minimum break
line when blowing bottles, which guarantee the quality of the
bottles;
The special neck sealing design reduces the pressure between
preform neck and sealing to the minimum, thus the neck of preform
couldn’t be damaged.
(6) Twice stretching system
The equipment has the special designed twice blowing system
(equipment for hot filling bottles has three times blowing system)
------ preblowing, blowing with high pressure to finally make
bottle. The blowing pressure and time of the second blowing can be
adjusted. The system can guarantee the quality of finished bottle,
so some bottles with complicated shapes can be blown;
The system has the special designed pressure over loading and loss
protection devices which can prevent the pneumatic parts from
damaging;
The system has the special designed stretching rail which
guarantees every bottle can be stretched with the same speed and
power during the stretching process.
(7) Transfer arm system
The transfer of preforms and bottles are finished by transfer arm,
which prevent prefroms and bottles from contamination;
The stainless steel transfer arm is processed precision, softly
contacts with prefrom or bottle, which can avoid the scratching of
the neck;
The transfer arm has the twisting force over loading protection
device which prevent the equipment from damaging when it breaks
down
(8) Safe and reliable mechanical transmission
All the important parts of the transmission come from the famous
brands in Europe and American, so equipment has the reliable
quality and long service life,The connection of the key
transmission has the soft protection system;
The special designed mechanical protection and automatically
replace system: prefrom entering device, oven, transfer arm,
rotating blower, main motor, all the above have the twisting force
over loading protection system. Even though equipment breaks down,
it won’t be damaged;
Torsion clutch of equipment adopts American brand which can easily
adjust the grades, with automatic overloading reset functions.
After eliminating resistance, the transmission system will
automatically rotate by itself, all linked parts will accurately
reset to the original position, without the adjusting of the
operator. So all the system is convenient and quick;
The transmission of main motor adopts German SEW Company’s
frequency conversion motor, positive speed gearbox and transducer,
which have characteristics of flexible non-class starter, non-class
adjustment, safety and stability;
Accurate connection between toothed belt and toothed belt wheel
guarantees the accurate and safe running of every transmission
part.
(9) SIEMENS PLC controlling system
The controlling system of automatic blowing machine is made up with
SIMATIC HMI (man-machine interface), Siemens industry controlling
system (PLC system) and related controlling, checking and executing
parts. The turn-on, turn-off and heating adjustment of equipment
can be done by the man-machine interface automatically.
SIMATIC HMI(man-machine interface)operating panel contains 36
programme functional keys(28 of them with LED). Bottle blowing
machine can be controlled by pressing the keys on the operational
panel or by clicking the mouse(USB interface is under the bottom of
the panel).
4. Advantages of Sunswell bottle blowing machine
Humanization man-machine interface
It’s easy to learn the operation of man-machine interface, because
there will be the breakdown position and explanation. Every
solenoid valve and cylinder can be checked to separately control
every mold to blow bottles.
Recycle the high blow air, so no need to build low pressure air
station.
With perform block inspect device, when any perform blocked, it
will reject automatically and recovery automatically.
Less time mold change time, can improve the production.
Technical parameter
| PRODUCTION DATA | unit | RBM-6 |
| Mold cavities | N | 6 |
| Max. body diameter | mm | 105 |
| Max. Height | mm | 335 |
| M. Neck diameter | mm | 36 |
| Max. preform Height | mm | 145 |
| Max. capacity | L | 2 |
| Nominal output for 0.5 L , bottle (*) | pcs/h | 12,000 |
| Rate of finished product(*) | % | ≥99.8 |
| DIMENSIONS | | |
| Main frame ( Length) * (Width)* (Height) | mm | 4424×2286×3050 |
| Weight | kg | 8000 |
| Oven ( Length) * (Width)* (Height) | mm | 4700×1660×2050 |
| Weight | kg | 3000 |
| Elevator (Length)*(Width)*(Height) | mm | 6480*4900*3840 |
| Weight | kg | 1200 |
| ELECTRICAL FEEDING | | |
| Voltage | V | 380 |
| Frequency | Hz | 50 |
| Total power installed | kW | 180 |
| #Voltage permitted | | +/-5% |
| #Frequency permitted | | +/-1% |
| Distribution | | 3PH + N + PE |
| COOLING SYSTEM/ HEATING SYSTEM | |
| BASE MOULD | | |
| Water inlet temperature (**) | ℃ | 8-10 |
| Water inlet pressure (**) | bar | 4-6 |
| BODY MOULD | | |
| water inlet temperature | ℃ | 9-15 |
| water inlet pressure | bar | 4-6 |
| BLOW AIR | |
| Nominal pressure | bar | 35 |
| Air rate (**) | m3/min | 10 |
| Filtering grade(filter) | micron | 0.01 |
| #Humidity | | dehumidified |
| #Oil | | Free |
| HEATING | |
| Heating groups * pcs | n | 10*7 |
| #ENVIRONMENT | | |
| Environment temperature (**) | ℃ | 0 -40 |
| Environment humidity ( without condensate) | % | 5 -60 |
| Max. altitude(over sea) | m | 3000 |
| #CONNECTIONS | | |
| Connection service air | Inch. | 1 |
| Connection blow air | Inch. | 2 |
| Connection water and oil | Inch. | 2 |
Components
- PLC program controller: Mitsubishi/Siemens
- Inverter: Mitsubishi/Siemens
- Photoelectrical controller: sick
- Proximity switch: Omron
- Other electrical components: Schneider
- Pneumatic component: Norgan/Festo
- Main motor: Sew/ ABB
