Automatic Rotary PET Bottle Stretch Blow Molding Machine

Main Features

• Blow Molding Machine

• Machine operation adopts TFT touch screen with multi languages and friendly interface. Speed, shift capacity and technical specifications can be set on the menu.
• High efficiency: 2,200-2,400 BPH/cavity (500ml CSD bottle).
• Double blowing system. Monitoring pressure change curve of each cavity during bottle forming and providing accurate timely parameters, easier for operator to regulate technical parameters and ensure quality stability.
• Adopt cam organism and accurate mechanical arm transferring technology with high speed preform and bottle feeding, avoiding contamination.
• Cam organism controls mold opening and clamping precisely with special mold clamping boost system and firm mold shelf structure; independent control of blowing parameters of each cavity; malfunction diagnosing function; enhanced neck sealing stability; regulating blowing pressure; stretching bar controls accurate preform axial stretching and 1^st / 2^nd blowing controls vertical stretching; regulating of 1^st / 2^nd blowing precisely ensures ideal distribution of bottle wall thickness.
• Heating adopts far infrared temperature control; each heating lamp of pre-heating and regulating zone can be regulated; timely temperature monitoring system ensures technical stability and accuracy, avoiding over high temperature of outer preform wall; 10-20% electrical power is saved by this heating system.
• Air recycling system may save compressed air by 30-50%.
• Technical parameters like heating temperature and blowing time can be set according to different preforms and bottle design.
• Fast mold changing (6-screw, 6-8 min for each mold) reduces stop time and increases production efficiency.
• Humanized design makes complicated industrial operation get used to habits.
• Blowing mold is made of aluminum alloy with oxidization treatment on surface to prolong mold lifespan.
• Preform infeed starwheel adopts preform block detecting device. When blocks, preform will be rejected and reset automatically.
• Safety door is equipped with alarming device to protect operators.

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.

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.

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.

UV treatment system for Preforms before loading into 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;

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.

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

Special mold frame system

The special designed mold frame system ensures the possibility of quick and accurate changing mold (6-screw)

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.

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.

Transfer arm system

The transfer of preforms and bottles are finished by transfer arm, which prevent preforms and bottles from contamination;

The stainless steel transfer arm is processed precision, softly contacts with preform 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

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.

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).

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.

More Detailed Features

• Horizontal heating chain drive system
• Use high-strength brass processing to extend the service life
• Large caliber cooling mouth, to ensure that the preform neck not heated, with effective protection of preform thread

• Efficient energy-saving preform heating system
• Adjustment device with ruler instructions, equipment adjustment more convenient
• Using streamlined guide plate, so that the air flow more effectively on the preform neck cooling and protection
• Mirror reflector, high reflection, more energy efficient
• Norgren’s smaller high pressure valve group, less dead space
• Saving blowing air

• Patented blowing nozzle unit for stable preform
• Positioning first, sealing after, to ensure that the preform vertical blowing, more stable.
• To avoid broken bottle blocking machine phenomenon.

• Fast mold changing unit (6-screw design)
• 6-screw mold change design
• 6-8min for each mold changing

• H-type steel frame, reducing vibration, more stable
• Driving platen and the host frame as a whole processing, more accurate to feed preforms. Ensure without vibration at 2000BPH each cavity.
• H-type steel welding, high-speed rotation more stable.

• High accurate filtration system and High pressure air recycling system
• High-pressure air recovery system can save 30% of air, in addition, the extra gas leads to other machines.
• High-pressure filtration system accuracy of 0.001ppmw, greatly extend the service life of pneumatic components.
• High speed & energy saving blowing system
• Integrated brake system with slewing ring, more reliable and stable.

• Reliable electrical control
• Through the teleservice remote monitoring system, real-time recording of any operation of the field device or shutdown information, through the analysis of software real-time analysis of equipment operating status.
• Energy metering
• Safety relay equipped
• Safety door locking
• Distributed field DP bus
• Site ASI bus

• Air conditioning and Anti-condensation System on electrical cabinet

• Preform unscrambling and returning

• Dropping preform collection during heating

• Ion air blowing (Optional)
• Ion gas blowing for removing dust on preform
• Positive and negative ion generator neutralize static electricity on surface of preform
• Blow clean compressed air onto the surface of the preform
• Vacuum dust suction

Technical Parameter