Which Injection Moulding Machine Is Used to Make PET Preforms?

A machine built for PET rather than a general-purpose one. Pratishna PET injection moulding machines cover lower and mid cavity preform tools, with larger tonnages discussed on request for high-cavity systems.

Can a General-Purpose Machine Mould PET Preforms?

It can, but results suffer. A standard screw adds shear heat, which raises acetaldehyde and IV loss, and without proper drying and post-mould cooling preforms can turn hazy. The faults carry through to the blown bottle.

How Should PET and rPET Be Dried Before Moulding?

Both need a desiccant dryer sized to throughput, with dry air at the hopper and enough residence time. rPET varies more from lot to lot, so moisture and IV checks before each batch help.

What Causes White Haze in a Preform?

Haze usually comes from crystallisation: thick walls cooling too slowly, too little holding pressure or cooling time, or an overheated gate area. Wet resin and high melt temperature make it worse.

Can Pratishna Recommend a Machine for My PET Preform?

Yes. Share the preform drawing, weight, neck finish, PET or rPET grade, cavity count and required output, and Pratishna Engineers will recommend a suitable PET machine.

Does the Machine Suit Other Bottle Packaging Parts Too?

The PET machine runs preforms of different weights and neck finishes, given the mould. Caps for those bottles, such as CSD caps, water bottle caps and flip-top caps, run on standard horizontal machines instead.

Injection Moulding Machine for PET Preforms

PET preforms, the test-tube shapes later blown into bottles, are made on PET-specific injection moulding machines from bottle-grade PET or rPET, in hot runner moulds. Cavity count and preform weight set clamp and shot size. Drying matters most, because wet PET breaks down in the barrel, losing IV and raising acetaldehyde.

For preforms, selection focuses on a low-shear screw, drying and hot runner capacity matched to output, and post-mould cooling that keeps preforms clear. Pratishna Engineers supplies PET injection moulding machines for preform production and can recommend a configuration for your neck finish and cavity plan.

Manufacturing PET Preforms?

Share preform weight, neck finish, cavity count and hourly output, and Pratishna Engineers will recommend a PET machine.

Request a Machine Recommendation Download Catalogue

Machine Requirements for PET Preform Moulding

PET behaves differently from the polyolefins used for caps, and a preform line is built around that. Main requirements:

Dryer that brings PET and rPET down to low moisture
Low-compression screw that limits shear and acetaldehyde
Hot runner with individual zone control for every drop
Post-mould cooling so thick walls stay clear
Steady shot weight for even preform weight across cavities
Neck finish dimensions held for thread and seal fit

Recommended Machine for PET Preforms

Preform machines are sized by cavity count, preform weight and the projected area of the cavity set. Lower and mid cavity tools fall within the PET injection moulding machines (75-260 T). Tools needing more clamp than that are discussed on request. Drying, hot runner control and post-mould cooling should be planned together with the machine.

PET Injection Moulding Machines - 75 to 260 tons

Not Sure Which Machine You Need?

Share your preform drawing and cavity plan to size the PET machine.

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Why Choose Pratishna Engineers?

Application-Based Machine Selection
In-House Engineering & Manufacturing
Multiple Machine Series
Production-Focused Solutions
End-to-End Technical Support
Industry-Specific Solutions
Machine Lifecycle Support

Injection Moulding Machine Buyer Resources

Download practical resources to help you select, size and specify the right machine.

PET Injection Moulding Machine Selection Guide
A step-by-step guide covering the key inputs needed to select the right machine: preform weight and neck finish, number of cavities, PET grade and drying, required clamping force, shot / injection capacity, mould dimensions, production quantity, cycle time and automation requirement.
Download PDFPDF · 265 KB
How to Calculate Clamping Force for an Injection Moulding Machine
A clear methodology that explains how clamping force is calculated, covering projected area, injection pressure, safety factor, number of cavities and material considerations.
Download PDFPDF · 363 KB
FMCG Packaging Components & Machine Guide
A guide to FMCG Packaging components, covering caps and closures, preforms, thin-wall containers, IML tubs, cutlery, pumps and sprayers. It explains hot runner tools, cavity count, fast cycles, food-contact grades, and how to match each part to a suitable machine.
Download PDFPDF · 206 KB

FAQs / Buyer Questions

Questions preform makers and bottlers raise before a PET machine order.

Which Injection Moulding Machine Is Used to Make PET Preforms?
A machine built for PET rather than a general-purpose one. Pratishna PET injection moulding machines cover lower and mid cavity preform tools, with larger tonnages discussed on request for high-cavity systems.
Can a General-Purpose Machine Mould PET Preforms?
It can, but results suffer. A standard screw adds shear heat, which raises acetaldehyde and IV loss, and without proper drying and post-mould cooling preforms can turn hazy. The faults carry through to the blown bottle.
How Should PET and rPET Be Dried Before Moulding?
Both need a desiccant dryer sized to throughput, with dry air at the hopper and enough residence time. rPET varies more from lot to lot, so moisture and IV checks before each batch help.

What Causes White Haze in a Preform?
Haze usually comes from crystallisation: thick walls cooling too slowly, too little holding pressure or cooling time, or an overheated gate area. Wet resin and high melt temperature make it worse.
Can Pratishna Recommend a Machine for My PET Preform?
Yes. Share the preform drawing, weight, neck finish, PET or rPET grade, cavity count and required output, and Pratishna Engineers will recommend a suitable PET machine.
Does the Machine Suit Other Bottle Packaging Parts Too?
The PET machine runs preforms of different weights and neck finishes, given the mould. Caps for those bottles, such as CSD caps, water bottle caps and flip-top caps, run on standard horizontal machines instead.

Technical Disclaimer

Disclaimer: The information provided in this webpage is for general informational and educational purposes only. It is based on technical references and industry information available at the time of preparation and may be subject to change. It does not constitute engineering, technical, commercial or professional advice, nor does it constitute a quotation, specification, warranty or contractual commitment by Pratishna Engineers.

Actual injection moulding machine and process requirements vary according to the component design, material, mould, production volume, machine configuration and operating conditions. The information, examples, calculations and recommendations provided should be independently evaluated and verified for the specific application before making any equipment, process or production decision. Information obtained from third-party sources remains subject to the accuracy and limitations of those sources.

Limitation of Liability: Pratishna Engineers makes no representation or warranty, express or implied, regarding the completeness, accuracy or suitability of the information for any particular application. To the extent permitted by applicable law, Pratishna Engineers shall not be liable for any loss, damage, cost or consequence arising from reliance on or use of the information contained in this webpage. Final machine selection, configuration and application suitability should be confirmed with Pratishna Engineers based on complete and accurate project requirements.

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