12 Questions Answered About ONE-STEP INJECTION ...

12 Questions Answered About ONE-STEP INJECTION STRETCH BLOW MOULDER

• Last updated December 24,

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01.

The Difference Between One-Step Injection Stretch Blowing And Two-Step Moulding And Their Respective Characteristics

Compared with the two-step method, the one-step process is completed in one piece of equipment, from raw materials to finished products.

The production process is simple, one-time moulding, its controllability is strong, the accuracy of the bottle mouth is high. And no secondary heating is required, so the energy consumption is low.

The two-step method requires injection moulding of the preform first and then secondary processing on the blow moulder machine to blow molding.

It is completed twice by an injection moulder machine and a blow moulder. It can be produced online or on separate lines.

02.

What Kind Of Applications Are Suitable For The One-Step Method And The Two-Step Method:

The one-step process is more suitable for medium and small batches and products with high hygiene requirements. Of course, it has more significant advantages for special-shaped bottles and thick-walled bottles.

At present, one of the two-step methods is high-speed equipment, which is suitable for the mass production of water bottles and beverages.

One is low speed (or semi-automatic) for some small quantity products.

The following picture shows the bottle type that can be processed by the one-step method:

03.

Features Of One-Step Injection Blow Moulder Equipment:

One-step blow moulder has three-station equipment, such as AOKI equipment. The three stations are preform injection moulding and temperature adjustment, stretch blow moulding, and product removal.

In addition to the three-station equipment, there is also four-station equipment, such as Nova&#;s equipment, which adds a cooling station to the original three-station equipment.

The ASB equipment has one more heating station based on three stations.

04.

The Materials Suitable For One-Step Blow Moulding Are

PET, PP, PETG, PC, PCTG, HDPE, HIPS, PES, PEN, recycled PET, amorphous PET, etc.

Specifically, different materials should be selected according to the stretch ratio, blow-up ratio and specific application of different materials.

Choose different materials. The barrier properties of the bottles are also different. The following figure shows the application of different materials.

Injection stretch blowing of square PET bottle:

Square bottle design: the biaxial stretching ratio is limited, and the most difficult to solve is the R angle problem.

At present, the shoulder of the square bottle can be directly injection moulded on the preform.

Application of PPSU material: PPSU has relatively small stretch and unique material properties and is currently mainly used for feeding bottles.

The company is the world’s best Water Bottle Blowing Machine supplier. We are your one-stop shop for all needs. Our staff are highly-specialized and will help you find the product you need.

05.

How Long Does The One-Step Blow Moulder Production Take

Depending on the product, the mould production time is generally 65 to 85 days, and mould adjustment time needs to be reserved.

One-step equipment currently has three stations and four stations. Each station has moulds, such as hot runners, mouth moulds (three sets), injection moulds, blow moulds, extension devices, etc.

The selection of mould materials for each station also has unique requirements, basically designated steel materials.

06.

What Is The Extreme Thickness Of The Bottle Processed By The One-Step Method?

Depending on the different conditions of different materials, the minimum and maximum wall thicknesses of PET materials in the one-step method are 0.1mm and 1.2mm. The thicker the consistency, the transparency will decrease. For some materials with slow crystallization speed, such as PETG, PCTA, TRITAN and other materials, the thickness of the bottle wall can be 2mm.

07.

When Designing The Preform, Is There Any Method Or Software That Can Simulate The Wall Thickness Distribution And Resistance To Pressure And Thermal Deformation Of The Bottle After Blowing? What Is The Approximate Accuracy?

CAE software can be used to simulate. If you are uncertain about the design, you can use cae software to simulate and analyze it. The colour is the thickness. At the same time, Cae can also affect the drop resistance. Be sure to provide accurate material parameters during simulation.

08.

The Aoki Aoki Machine Should Rely More On Preform Cooling In Different Positions. Can You Share This Aspect? That Is, How To Match And Adjust The Waterway Design And The Residual Temperature?

AOKi equipment process, bottle forming is mainly formed by the residual temperature of the preform itself. The thin wall is cooled first, and the thick wall can be extended. Therefore, the forming of some heterosexual bottles can be carried out according to the principle of different cooling effects of different thicknesses of the preforms. Some products may also require hot kerosene cooling.

09.

What Process Does The Hot Filling Bottle Need To Achieve?

Generally, the bottle mouth of hot-filled products needs crystallization treatment. The body and bottom of the bottle are solved with a rib structure. The two-part method is easy to realize. The one-step process is more complicated. For the one-step bottle of standard material, the heat resistance limit is 65 degrees for 3 minutes.

10.

The Benefits Of Reheating During The Moulding Process Are:

Purpose of reheating: mainly to recrystallize the material to enhance heat resistance and rigidity.

11.

The Inner Wall Of Some PET Bottles Has Relatively High Tension, And The Contents Are Prone To Wall Hanging. Is There Any Way To Solve It?

At present, to completely solve this problem, it is basically necessary to use special coatings. It has been applied in the food industry, but price, compatibility and production line arrangement are problems. I know that the significant colour masterbatch factories worldwide are trying to do it. Still, there is no commercialization plan at present.

12.

The Bottles Are Prone To Deformation When Transported Over Long Distances In The Summer. What Should I Pay Attention To?

PET bottles are generally easy to squeeze and deform above 60 degrees. The deformation may be related to the bottle shape. If the bottle shape cannot be changed, it is recommended to consider the packaging.

If you want to learn more about how much would it cost for a PET blow moulder? Simply fill in the form below to contact us 24/7.

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.

If you want to learn more, please visit our website PE Foam Recycling Machine.