# what are you looking for？
a technical problem solver ？！
Hello, I’m Vivian, the passionate second-generation leader of Zhongshan Jindong Machinery Co., Ltd, and the proud founder of www.ibottler.com. With a wealth of experience in the field of plastic bottle machinery and molds, my ultimate mission is to simplify the complexities of bottle blowing and propel the reputation of ‘Made in China’ products on the world stage.
My journey began with a degree in Business Administration, which has shaped my approach to problem-solving and strategic planning. Although English is not my first language, my expertise in bottle blowing machines transcends language barriers.
At my core, I am a dedicated professional who takes immense pride in helping others – customers or not. Often, I find myself assisting others with various bottle blowing machine issues, drawing from my rich experiences.
In addition to managing operations at Zhongshan Jindong Machinery, I am also actively engaged in the research and development of more automated and higher output bottle blowing machines. I strongly believe in the potential of automation to revolutionize the industry.
On this platform, I will share the challenges, successes, and lessons learned from my journey in plastic bottle production. If you’re navigating the same waters, I hope my shared experiences can provide guidance and solutions.
Author-Vivian
I like to talk with you about the technical problems of bottle blowing and solve them.
Latest Post
Our real case scenario
- Novice must see
Case - A
A case sharing is to let you better choose the bottle blowing machine and mold that suits you.
（G:Gamal Abdul / V:Vivian）
V:Hello Gamal Abdul. Please tell me the specifications of your bottle blowing machine, semi-automatic or fully automatic, how many cavities? The bottle blowing mold is to be customized according to your bottle blowing machine.
If you want to produce a PET plastic bottle, you need the following machinery:
1. Bottle blowing machine (semi-automatic and fully automatic according to your budget and output requirements)
2. Mold
3. Air compressor
4. Chiller
V:
Semi-automatic: 1. Suitable for small factories or individuals
2. Wide range of applications: can blow various types of PET plastic bottles
3. Easy to install and operate
4. Small budget, basic model < $10000
5. Easy to replace the mold
Fully automatic: 1. Suitable for medium-sized factories
2. Suitable for centralized production of two or three types of bottles
3. High degree of automation and high output
4. The budget is slightly higher, the most basic model with 2 chambers automatic bottle blowing machine > $26000
5. 2-12 cavity automatic bottle blowing machine, output 2000-24000PCS/H can be selected
We have very many specifications:
Most of them are customized, because customization according to your product is more suitable for production.
The most basic ones are:
JD-3L-2/JD-5L-2/JD-10L-1/JD-20L-1, etc.
(☆ 3L means that the bottle blowing machine can produce a maximum bottle capacity of 3000ml, and 2 means that 2 bottles can be produced at a time)
According to your requirements: JD-3L-2 meets your needs，output 900-1000PCS/H.
Dear. Very glad you have an idea for the bottle.
You know we produce bottles, we need bottle blowing machines and molds. The mold is very important for the bottle blowing machine, and the drawing of the bottle is very important for the mold.
Usually customers want to make molds, we have three ways to determine the drawings of the bottle:
1. The customer provides me with the sample bottle A or the drawing, and we process the mold according to the sample bottle and drawing data
2. The customer provides some pictures or general ideas, and our designer will design and complete a new bottle shape drawing (of course, we will combine the actual production experience to avoid some shapes that are not suitable for production)
3. I provide some classic case bottles for your reference. The capacity and part of the shape can be modified. According to your ideas, the designer can complete a bottle drawing you like.
Of course, confirm the order, pay the deposit, and design for free.
V:You also need to buy preforms, so that machinery + mold + preforms can produce PET plastic bottles.
What is a preform?
The preform process is injection molding, and the injection molding machine produces preforms.
The bottle production process is: heating the preform and using a bottle blowing machine combined with mold production, we will get the plastic bottle we want.
Some large factories, because they have a large output, they all inject preforms by themselves.
Of course, you don’t need to produce preforms yourself, you just need to buy preforms.
V:Dear. Very good question.
It is very important to choose the preform
There are standard styles and non-standard (customized) preforms
There are three main points to note in the standard style:
1. Caliber: For example, 3025/1881/40/24/28 are all international standard calibers.
(3025 is suitable for water bottles, 1881 is suitable for coke, etc.)
2. Weight: The weight of a preform determines the cost of your product. So how to choose the right weight?
A. If the bottle shape is the most important for your product, choose the preform weight according to the bottle. The software we designed will calculate the suitable weight for this bottle based on the bottle. This is the preform weight for your reference. . For example, for your 500ML, our software recommends using 18 grams of preforms, and the caliber is the general 3025 caliber.
B. If you want to save cost and you want to choose 3025/14g preform to produce 500ML bottle, then our suggestion is to add some stripes on the bottle to strengthen the hardness.
3. Color: preforms also have many colors, blue and green are often seen. Of course, most of them are transparent, and you can choose according to your product positioning, but in terms of price, the colored ones will be slightly higher.
V:My factory does not produce preforms.
But my 300+ customers are producing preforms
Because they bought my injection molding machine and preform molds, I know a lot about preforms and prices.
More than 65% of overseas customers choose to ask me to help buy preforms together. Why?
1. I am more professional than them, and know which preform is more suitable for their bottle production.
2. I can get a lower price
3. I will test the preform for the customer to ensure that it is qualified
4. I provide all machinery and preforms in one stop, if there is any production problem, the customer can contact me and I will solve it.
V:This question is everyone’s biggest concern
Do not worry
100% of all my customers who bought bottle blowing machines learned how to operate it.
How to do it:
1. After receiving the machine, I will send an instruction manual, an installation book, and an installation video
2. When debugging machinery in our factory, for example, if I buy preforms for you, I will use this preform to debug your bottle blowing machine and mold, and record the data. You just need to operate according to the data I provided, everything is very easy.
3. If you haven’t learned to operate, it’s okay, we can video, I will communicate with you online to solve the problem.
I will go through many ways to ensure that you must operate the bottle blowing machine.
Case -B
If you already have machinery and want to make molds, how can we connect the data?
（J:Jason / V:Vivian）
V:Well, 300T/3025/16 can be made with 48 cavities. Of course, according to the needs, many people also choose 32 cavities.
We have two specifications of long tail and short tail. The short tail is selected for higher precision requirements, and the hot runner process is more stable.
But it doesn’t mean that the long tail is worse, it is to choose the process according to the price and quality requirements of the products you produce.
V:1. You can provide the model of the injection molding machine manufacturer (if it is made in China).
2. You can provide the distance between the four positioning rods.
V:Before designing, you must first determine whether your preforms are for personal use or for sale?
1. If it is for your own use, we will design the preform according to your bottle shape.
2. If it is for sale, we will design according to the general structure of the market, which is suitable for most bottles.
V:1. Die part S136H
2. Mold base 4CR13
3. Single point temperature control electric box
4. The design of the hot runner is more reasonable, the heat is even, and it is not easy to turn white
5. Each mold core can be replaced
V:1. The processing time of the preform mold is about 40-50 days.
2. We provide 100-300 preforms according to the number of cavities of the preform mold.
Are you troubled by these problems?
- we provide solutions
The bottom of the PET preform is whitish？
Reason
1. Insufficient temperature of hot runner
2. Insufficient material temperature
Elimination method:
1. Strengthen heat insulation measures 2 . Increase the temperature of the nozzle here 3 . Properly increase the material temperature 4. Speed up the injection speed5. Reduce the holding pressure6. slow down cooling water flow
PET preforms are opaque?
Reason:
1. Insufficient drying of raw materials
2. Insufficient plasticization of raw materials
3. pp> preform wall thickness is too large or insufficient cooling
4. mixed with other plastics
5. Material temperature is too low
Elimination method:
1 Guaranteed to dry for more than four hours 2. Raise the material temperature 3. Increase the screw speed 4. Check whether the temperature of the drying material is too low or the injection volume does not match. It is necessary to ensure that the raw material is dried at 165 degrees until the moisture content is less than 0.02%. 5. Enhanced cooling, thinner wall thickness
There is fog on one side of the PET preform？
Reason:
1. Holding pressure too high
2. Bottom film gate hole eccentric
Elimination method:
1. reduce stress
2. Correction mold
PET preforms have air bubbles?
Reason:
Insufficient drying
Elimination method:
1. Strengthen drying 2. Increase material temperature 3. Reduce screw speed
Depression on the PET preform surface？
Reason:
1. Material temperature is too high
2. injection rate is too short
3. Dwell too short
4. Injection time is too short
5. Insufficient cooling
Elimination method:
1. Lower material temperature
2. Reduce the injection rate
3. increase pressure
4. increase injection time
5. increase water pressure
PET preform gate with wire drawing？
Reason:
1. Poor insulation
2. Insufficient cooling
3. pressure in heat flow
4. Bad screw check
5. Holding pressure too low
Elimination method:
1. Guaranteed heat insulation at the gate
2. increase cooling
3. Reinforce the inverted cable
4. Clean the screw nozzle
5. increase pressure
Bending of PET preform after demoulding?
Reason:
1. Gate hole eccentric
2. uneven cooling
Elimination method:
1. Correct mold 2. Reduce the holding pressure
3. Increase injection speed 4. extended cooling
5. Clean up waterways 6. Increase cooling water pressure
Uneven PET preforms？
Reason:
1. Poor mold manufacturing
2. Gate hole deviation
3. Injection pressure too high
4. core shift
Elimination method:
1. Correction mold
2. Raise material temperature
3. turn down the pressure
4. Mold with high strength, high precision and adjustable core structure
PET bottle transparency is not good？
reason:
1. The heating temperature is too high. 2. The heating time is too long. 3. Compressed air contains moisture. 4. The embryonic tube itself is opaque. 5. The embryo tube design is inappropriate. 6. The inflation rate is too small
Elimination method:
1. Lower the temperature 2. Shorten the heating time 3. Use a dryer to remove moisture 4. Improve the quality of the embryo tube, select materials, and increase the dryness of the raw materials 5. Improve the size design of the embryo tube 6. Reduce the diameter of the preform.
PET bottle whitish？
reason:
1. The heating temperature is too low. 2. The embryonic tube wall thickness is uneven. 3. The thickness of the embryo tube is too thick and the heating penetration is insufficient.
Elimination method:
1. Increase the temperature or slow down the rotation speed 2. Improve the quality of the embryo tube 3. Reduce the thickness of the embryo tube, or try to add a heating device cover to increase the temperature distribution surface of the preform.
The position of the nozzle at the bottom of the PET bottle is offset?
reason:
1. The blowing time is too early 2. The stretching rod has not been lowered to the bottom 3. The stretching rod deviates from the center line of the bottle axis 4. The wall thickness of the embryo tube is uneven or the injection density is uneven 5. Uneven heating
Elimination method:
1. Delay the blowing time or increase the descending speed of the stretching rod 2. Adjust the position of the magnetic pole switch 3. Adjust the position of the stretching rod 4. Improve the quality of the embryo tube 5. Improve the heating conditions, or check whether there is any problem with the rotation of the preform.
Uneven wall thickness of PET bottle？
reason:
1. The position of the stretching rod is not in the center of the preform 2. The blowing holes are asymmetrical and have different hole diameters. 3. The stretching ratio is too low or the blowing ratio is too small. 4. The embryo tube does not rotate in the heating furnace. 5. The embryonic tube wall thickness is not good. Injection density is uniform or uneven
Elimination method:
1. Adjust the position of the stretching rod 2. Adjust the position and diameter of the blowing hole 3. Increase the stretching or inflation ratio 4. Check the rotating device 5. Improve the quality of the preform.
The upper part of the PET bottle is too thick？
reason:
1. The temperature of the upper part is too low 2. The vent hole of the mold is too far from the upper part 3. The stretching ratio is too low 4. The inflation ratio of the upper part of the bottle is too low 5. The stretching rod speed is too slow
Elimination method:
1. Heating the upper part 2. Adjust the position of the exhaust hole 3. Increase the stretching ratio 4. Change the bottle shape 5. Adjust stretch rod speed.
The bottom of the bottle is too thin?
reason:
1. The upper part of the material does not stretch downward. 2. The bottom of the preform is designed to be thin. 3. The bottom temperature is too high.
Elimination method:
1. Delay the start of blowing time 2. Reduce the bottom temperature 3. Increase the thickness of the bottom of the preform.
Bottle parting line thickness？
reason:
1. Insufficient mold clamping pressure 2. Sealing time too early 3. Mold problem 4. The size of the preform mouth does not match the mold
Elimination method:
1. Increase the clamping pressure and adjust the angle of the clamping stay (<5 degrees). 2. Move the clamping stroke switch position backward. 3. Repair the mold or check the assembly position of the mold, such as whether the guide rails are aligned and the columns are loose or whether the mold is not properly aligned. Pressure 4. Repair the matching position of the mold teeth.
PET bottle bottom blasting？
reason:
1. The delayed air blowing time is too short 2. The delayed mold opening time is too short 3. The temperature is too high 4. The exhaust valve does not work
Elimination method:
1. Extend the delayed air blowing time or increase the descending speed of the stretch rod 2. Extend the delayed mold opening time 3. Cool down 4. Clean the exhaust valve with gasoline.