The PET plastic jars preform manufacturing line includes PET material, molds, injection molding machine and relative auxiliary machines.
A PET plastic jars preform manufacturing production line has four main parts.
- Part one is platsic material: plastic jars preform use PET material
- Part two is manufacturing machine: use jar PET preform injection molding machine
- Part three is the PET jar mold: design PET plastic jars mould as per production request
- Part four is auxiliary equipment: including a dryer, auto loader, chiller, and take-out robot.
Haichen one of the professional pet jar preform injection molding machine manufacturer provides complete PET jar preform manufacturing lines from material drying to finished preforms. With this production line, you can proudce many different type of wide mouth pet jars preforms. Like preforms of pet jar, pet jar bottle, plastic pet can, and also plastic kitchen storage containers and so on. That is why are PET jar injection molding machines so popular
Here, as an expert in pet jar manufacturing, we will firstly analyse PET plastic jars preform manufacturing Line. Later, introduce PET jar preform injection molding process then send the PET jar injection molding machine guide
Plastic Jar preform Material-PET
- Select PET material for PET Jar preform
- Dry PET plastic Jar preform material
Select PET material for Jar preform
Plastic jar preform mostly use PET material. These pet jar bottle preforms need PET with higher intrinsic viscosity. The standard range is 0.72 to 0.84 dl/g. Higher viscosity gives better melt strength for wide-mouth designs. Some plastic jar manufacturers use a blend of virgin and recycled PET. The recycled content must be carefully controlled to maintain quality. The material choice directly affects the preform clarity and strength. For palstic jars used in hot-fill applications, heat-set PET grades are necessary. It’s the important point which will affect the material and manufacturing costs of pet jar.
Dry PET Jar preform material
PET pellets absorb moisture from the air. A dehumidifying dryer removes this moisture before processing. The dryer uses hot air at 150-170°C. The drying time ranges from 4 to 6 hours. The moisture level must drop below 0.004% before injection. Wet PET causes cloudy preforms and weak spots. A two-stage drying process works best for pet plastic jars preform production. The first stage runs at lower temperature, and the second stage reaches full drying temperature.
pET jar Preform Injection Molding Machine
- Machine PET screw design optimize
- Injection Machine Clamping force requirements
Machine PET screw design optimize
Standard screws do not work well for PET, as the PET jar injection molding machines use longer screws with special barrier designs. The screw L/D ratio is larger than standard screws. This improves plasticizing ability and melt consistency. The screw also needs a mixing section to lower acetaldehyde levels. Low acetaldehyde is important for food contact applications. High acetaldehyde affects the taste of products stored in pet plastic containers. The screw design must balance melting quality with shear heat generation.
Injection Machine Clamping force requirements
The machine must keep the mold fully closed during injection. Insufficient clamping force causes flash defects on the preform neck. For example, a 24-cavity PET jar or plastic kitchen storage containers preform mold with 63mm neck diameter, the required clamping force is significant. The clamping system needs a large opening stroke for deep preform cavities.
Haichen HCK series PET injection molding machines provide clamping force options from 120 to 700 tons. This range covers small 8-cavity molds to large 48-cavity plastic jar preform molds.
| INTERNATIONAL CLASS NO | HCK280-PET Technical | |
| INJECTION UNIT | ||
| Screw diameter | mm | 70 |
| Screw L/D ratio | L/D | 25 |
| Shot volume(theoretical) | cm3 | 1155 |
| Injection weight(ps) | g | 1340 |
| oz | 47.3 | |
| Injection pressure | Bar | 1305 |
| Injection rate | cm3/s | 448 |
| Plasticizing capacity | g/s | 60 |
| Screw speed （Max.) | r/min | 167 |
| CLAMPING UNIT | ||
| Clamping force | kN | 2800 |
| Space between tie bars(W×H) | mm | 620*570 |
| Platens size | mm | 880*830 |
| Opening stroke | mm | 560 |
| Min.Mold height | mm | 270 |
| Max.Mold height | mm | 620 |
| Distance between platens(daylight) | mm | 1180 |
| Ejector stroke | mm | 150 |
| Ejector force | kN | 100 |
| OTHERS | ||
| Systerm pressure | Bar | 175 |
| Pump motor | KW | 38 |
| Heating power | kW | 16 |
| Oiltank cubage | L | 300 |
| Machine dimension(L×W×H) | m | 6.5*1.5*2.3 |
| Machine weight | t | 9.5 |
Design pET Jar Preform Mold
- Wide-mouth Jar preform mold cavity
- Mold Cooling channel layout
Wide-mouth Jar preform mold cavity
PET plastic jars cavities have different geometry than bottle preforms. The neck diameter is larger, typically 38mm, 45mm, or 63mm. The preform body is shorter and wider. The cavity requires a precise surface finish for clean release. The mold uses high-grade steel like S136. This steel resists wear from high-volume production. The cavity design also includes the thread profile for the jar finish. The thread must match standard jar cap sizes.
Mold Cooling channel layout
PET Jar preforms need efficient cooling to maintain shape. The mold has water channels built around each cavity. Cool water at 7-15°C flows through these channels. The channels must be placed close to the cavity surface for effective heat removal. Uniform cooling prevents warping and shrinkage. Good cooling design also shortens the cycle time. Shorter cycles mean more preforms per hour. The cooling system is often the longest part of the production cycle.
Auxiliary Equipment for pET Jar Preform
- Dryer
- Auto loader
- Chiller
- Take-out robot
Dryer
A dehumidifying dryer is essential for PET processing. The dryer removes moisture from the pellets before they enter the machine. It uses hot air at 150-170°C circulated through the pellets. The drying process takes 4-6 hours. The dryer size must match the machine’s hourly material consumption. A complete jar preform line always includes this equipment. Without proper drying, the preforms will have defects and reduced strength.
Auto loader
An auto loader transfers dry pellets from the dryer to the machine hopper. It uses a vacuum system with sealed pipes. The pipes must withstand high temperatures. The loader runs automatically to maintain a constant material supply. This prevents production interruptions. The loader also keeps the material clean by avoiding manual handling. Some systems include a magnetic separator to remove metal contaminants.
Chiller
A chiller provides cold water to the mold’s cooling channels. The water temperature stays between 7°C and 15°C. Cold water removes heat from the preforms faster than tap water. This shortens the cycle time. The chiller size must match the machine’s cooling needs. A typical jar preform line needs a chiller with adequate flow rate and cooling capacity. The chiller also supplies water to the hot runner controller for temperature regulation.
Take-out robot
A take-out robot removes finished preforms from the mold. The robot moves between the mold halves after opening. It grips the preforms by the neck and lifts them out. The robot then places the preforms on a conveyor. This automation speeds up the cycle and prevents part damage. Some robots include a cooling station for additional cooling before release. The robot also protects the operator from the hot mold area.
The PET plastic jars preform manufacturing line includes the material, PET injection molding machine, a multi-cavity jar preform mold, and auxiliary equipment.
Welcome contact us to discuss your PET jar preform production needs. According to your specific demand, we will offer suitable PET plastic jars manufacturing line. Furthermore, as a professional PET jar preform injection molding machine manufacturer, we also supply problems and solutions about pet jars injection moulding.
PET jars preform manufacturing Line price
Basic Manufacturing line price
For limited mini production budget, basic manufacturing line price including injection molding machine for jar pet preforms and PET jar preform mould
Complete Manufacturing line price
The complete manufacturing line price involves PET jar preform injection molding machine, plastic PET preform molds, some auxiliary devices like dryer, chiller, crusher and robot to improve production efficiency
