PET (polyethylene terephthalate) bottles are widely used for packaging beverages, edible oils, pharmaceuticals and other liquid products. The process of making these bottles involves a specialized machine called a PET blow molding machine. In this article, we will take an in-depth look at the PET bottle blowing process and the role of the PET bottle blowing machine in this important manufacturing process.
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The process of blowing PET bottles starts with the raw material, which is PET resin. The resin is first melted and then molded into a preform using an injection molding machine. The preform is a tubular structure with a neck and threads that resembles the shape of the final bottle. Once the preforms are produced, they are transferred to the PET blow molding machine for the next stage of processing.
PET bottle blowing machines play a vital role in transforming preforms into final bottles. The machine uses a process called stretch blow molding, which involves heating the preform and then stretching and blowing it into the desired bottle shape. Let’s take a closer look at the key steps involved in blowing PET bottles using a PET bottle blowing machine:
Preform heating: The preform is loaded into the heating part of the machine, where it undergoes a process called preform conditioning. During this stage, the preform is heated to a specific temperature that makes it malleable and suitable for subsequent stretching and blow molding processes. The heating process is carefully controlled to ensure uniform heating and avoid deformation of the final bottle.
Stretching: After the preform reaches the optimal temperature, it is transferred to the stretching station of the PET bottle blowing machine. Here, the preform is stretched axially and radially using stretch rods and stretch blow pins. This stretching helps orient the molecules in the PET material, which increases the strength and clarity of the final bottle.
Bottle blowing: After the stretching process is completed, the heated and stretched bottle preform is moved to the bottle blowing station. During this stage, high-pressure air is injected into the preform, causing it to expand and form the shape of the bottle mold. The mold itself is carefully designed to give the bottle the desired shape, size and features, such as neck and thread details.
Cooling and ejection: After the blow molding process is completed, the newly formed PET bottle will be cooled within the mold to ensure that it maintains its shape and structural integrity. After sufficient cooling, the mold is opened and the finished bottles are ejected from the machine, ready for further processing and packaging.
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Plastic system: high efficiency and plastic mixing screw,ensure that the plastic is full, uniform.
Hydraulic system: Doubld proportion control, put the frame adopts linear guide rail and mechanical type decompression, run more smoothly, within imported famous brand hydraulic yuan. Device stable speed, low noise, durable.
Extrusion system: frequency variable+toothed surface reducer, stable speed, low noise, durable.
Control system: This machine adopt PLC man- machine interface (Chinese or English)control,touch operation screen operation,can process set,change,search, monitoring, fault diagnosis and other functions can be achieved on the touch screen. Convenient operation.
Die opening and closing system: arm of the girders, third point, central lock mould mechanism, clamping force equilibrium, no deformation, high precision, less resistance, speed and Characteristic.
The entire process of blowing PET bottles using a PET bottle blowing machine is highly automated and efficient, and can achieve high-speed production and stable quality. Modern PET blow molding machines are equipped with advanced features such as infrared heating systems, servo-driven stretch rods and precise control systems to optimize the production process and minimize energy consumption.
In addition to standard single-stage PET blow molding machines, there are also two-stage PET blow molding machines, which contain an intermediate step for creating the preform using an injection molding machine. This two-stage process provides greater production flexibility and allows preforms to be stored for future use, reducing the need for continuous operation of the PET blow molding machine.
The versatility of PET bottle blowing machines enables the production of bottles of various sizes, shapes and designs to meet the diverse packaging needs of various industries. From small single-serve bottles to large containers, PET blow molding machines can be configured to meet different production requirements, making them an integral part of the packaging industry.
In short, the process of blowing PET bottles using a PET blow molding machine is a complex and precise manufacturing process, including heating, stretching and blowing the preform to produce high-quality PET bottles. With advancements in technology and automation, PET bottle blowing machines continue to play a key role in meeting the growing demand for PET bottles across different industries. As the packaging industry develops, PET bottle blowing machines will undoubtedly continue to innovate and adapt to the changing needs of the market, ensuring efficient production of reliable and sustainable packaging solutions.
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PET bottle blowing machine is a PET (full name: polyethylene terephthalate) material blowing equipment, mainly used for carbonated beverage bottles, mineral water bottles, cosmetic bottles, oil bottles, medicine bottles and other plastic hollow containers blowing Bottle making. At present, the PET bottle blowing machine on the market are mainly divided into two categories. One is the one-step blowing machine, which directly uses PET raw materials for drying, injection molding, temperature adjustment, stretching, and blowing. (Abbreviation: injection stretch blowing) At present, the one-step machine is mainly used in the cosmetics industry. It is compatible with various bottle diameters, thicknesses and shapes. The disadvantage is that it is limited by the injection time, its production efficiency is low, and the machine price expensive. The second type is a two-step blow molding machine. When using a two-step blow molding machine, PET raw materials must be made into preforms before blowing. The bottle production process is completed by preforming, heating, and stretching and blowing. Compared with the one-step blow molding machine, the two-step blow molding machine is not only more efficient and more energy-saving, but its price is more favorable than the one-step blow molding machine.
The two-step blow molding machine is divided into semi-automatic blow molding machine, automatic linear blow molding machine, rotary blow molding machine.
Semi-automatic bottle blowing machine: single-cavity and two-cavity blowing machines are common, and their efficiency is low. Fully automatic linear blowing machine: common models are 2 cavities, 4 cavities, 6 cavities, 8 cavities, 9 cavities, 10 cavities, etc. Most of the linear machines on the market are still flip-in embryo and flip-out bottle, and cannot be directly connected to the air duct. The handover of bottle blowing machine and filling machine requires the help of a bottle unscrambler to complete the handover. The output is generally not too high due to model restrictions, suitable for small and medium-sized enterprises.
Rotary bottle blowing machine: The bottle blowing workstation rotates, and the heating furnace still moves linearly. The internal structure and control mode of the machine are more complicated. Common models have 8 cavities, 10 cavities, and 16 cavities. 20 cavities, 24 cavities, 30 cavities, etc. Suitable for large factories, expensive, complex structure, and higher maintenance costs.
The two-step blow molding machine is divided into semi-automatic blow molding machine, automatic linear blow molding machine, rotary blow molding machine.
Semi-automatic bottle blowing machine: single-cavity and two-cavity blowing machines are common, and their efficiency is low. Fully automatic linear blowing machine: common models are 2 cavities, 4 cavities, 6 cavities, 8 cavities, 9 cavities, 10 cavities, etc. Most of the linear machines on the market are still flip-in embryo and flip-out bottle, and cannot be directly connected to the air duct. The handover of bottle blowing machine and filling machine requires the help of a bottle unscrambler to complete the handover. The output is generally not too high due to model restrictions, suitable for small and medium-sized enterprises.
Rotary bottle blowing machine: The bottle blowing workstation rotates, and the heating furnace still moves linearly. The internal structure and control mode of the machine are more complicated. Common models have 8 cavities, 10 cavities, and 16 cavities. 20 cavities, 24 cavities, 30 cavities, etc. Suitable for large factories, expensive, complex structure, and higher maintenance costs.
Faygo FG series linear blow molding machine combines the advantages of rotary blow molding machine and linear blow molding machine. It uses cam linkage to integrate mold clamping, mold clamping, sealing lowering and bottom mold raising. Driven by a servo electric cylinder, the blowing cycle is greatly shortened, which not only improves production efficiency, but also makes the movement of the entire clamping mechanism softer. The machine runs more stable and efficient. The whole machine adopts a modular design concept, and the part card slot installation does not require position adjustment, which is convenient for customers’ daily maintenance and mold replacement. The entire mold change time is basically about 25 minutes.
Heating method: The embryo feeding and heating method of FG series blow molding machine is the same as that of a rotary blow molding machine. The heating adopts a small pitch arrangement of 38mm to maximize the utilization rate of the heating furnace. So as to achieve a more energy-saving effect. Compared with the traditional linear blow molding machine, heating method, energy saving is about 40%. The inside of the light box is equipped with a bottle cooling system, a heating equalization fan and a residual temperature exhaust system. The constant temperature inside the light box makes the preform heating effect more stable. The heating furnaces of FG4 and FG6 models are heated by 9-layer infrared lamps, and bottles of 200ml~ml are compatible. The temperature of the light box can be controlled by adjusting the intensity of the output voltage through the display screen. Each layer of light tubes is individually adjustable, which can achieve more precise temperature control.
Variable pitch and preform take-up and bottle delivery: The heated preform is controlled by a servo motor to move the preform pitch to the blowing pitch through variable pitch control. The gripper for taking the embryo and the bottle is transferred to the mold for blowing. The gripper for taking the embryo and the bottle is a mechanical gripper. The cylinder is not used to control the opening and closing, and the operation is faster and more stable. The variable pitch and embryo fetching and bottle feeding mechanism are all servo controlled, which not only runs fast, but also runs very smoothly. The error per cycle will not exceed 0.01 second. Ensure the perfect transfer of the preform from the heating furnace to the mold.
High-pressure blowing system: FG series blow molding machine only requires the customer to provide 3.0MPa high-pressure gas, the internal pressure of the machine is reduced by a pressure reducing valve, and a precision filter is installed at the air inlet to ensure access The cleanliness of the machine air source. The machine is equipped with 3 stainless steel gas storage tanks to stabilize the pressure, respectively, the main gas tank, the pre-blowing gas tank and the second blowing gas tank to ensure the stability of the blowing pressure. The machine adopts the diaphragm valve of American Parker. This valve not only has a fast response speed, but also has a large flow rate. It can maximize the effect of blowing in the shortest time and greatly save the time of blowing. The high-pressure gas pipeline connection of the whole machine has been strictly measured and calculated to minimize the dead zone of high-pressure blowing, so as to achieve more energy-saving purposes.
Lifting mechanism embryo machine: The preforms are manually poured into the hopper, and the elevator detects whether there is a preform in the embryo falling track through the induction monitoring system, and then starts automatic feeding. During the feeding process, it can be adjusted according to the production speed of the machine. The lifting speed of the hoist is adjusted. If the embryo guide, signal shows that the embryo is full, the lifting machine will automatically stop the embryo. We use a preform recovery device for the unscrambler. If the elevator speed is too fast or there are excess preforms in the unscrambler, it will return to the hopper through the preform recovery device to ensure that the preforms can be safely and orderly Enter the embryo guide.
Bottle-out device: The bottle-out rail of the FG series bottle blowing machine can be directly connected with the air duct of the filling machine, and the bottle-out height is basically the same as that of a conventional filling machine. There is a set of bottle dropping cylinders on the bottle outlet guide. Its function is to detect a broken bottle and it will open to make the broken bottle fall down, so as to ensure that all the qualified bottles enter the air duct. It has another function: To prevent bottle blocking, if the air duct jams the bottle, it will open and close with the blowing rhythm of the machine, so that the blown bottle will fall into the bottling bucket below, and the machine will not stop because of the air duct jam. This makes the machine more automated.
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