PET preform mold project review
Define the mold before you compare the quote.
A useful PET preform mold proposal starts with the bottle application, preform weight, neck finish, target output and injection machine. This page organizes those decisions so you can compare quotations on the same technical scope instead of comparing incomplete prices.
Common cavity review
24 / 32 / 48 / 64 / 72
Product definition
Application, neck, resin, weight
Quotation basis
Drawing, neck, weight, machine
Technical scope
Hot runner, cooling, trial, spares
Project definition
You do not need a complete technical package to begin, but these five inputs prevent the quotation from being built on assumptions. Send what is known and identify what still needs review.
Water, beverage, edible oil, cosmetic, daily chemical, large-container and wide-mouth projects place different demands on preform weight, neck geometry, appearance and production volume. The application gives context to every later decision.
Weight affects the total shot requirement, cooling load and realistic cavity range. Use the approved drawing or a confirmed sample value rather than estimating weight from bottle capacity alone.
The neck finish must match the closure and downstream line. A label such as 28 mm is not always enough; provide the standard, drawing or cap sample when available.
Cavity count is an output and investment decision, not a quality badge. State the target preforms per hour, operating plan and preferred cavity count so neighboring options can be compared.
The machine model and specification determine whether the proposed mold can fit, inject, cool, control and open correctly. A machine name alone is useful, but the technical sheet is better.
Start without a complete specification
Quotation scope
Two quotations can carry the same cavity number and still describe different equipment. The comparison should identify the cold side, hot side, control, service parts, trial obligation and documentation instead of hiding them behind one total price.
| Scope | What the proposal defines | Buyer check |
|---|---|---|
| Mold and cavity components | Core, cavity insert, neck ring, lock ring, wear components, mold plates, guiding and alignment items. | Confirm material, replaceability, quantity, interchangeability expectations and the drawings supplied after order. |
| Hot half and runner system | Manifold, nozzles, heaters, thermocouples, valve-gate actuation, insulation and connection arrangement. | Confirm the system make or specification, number of control zones, included spares and maintenance access. |
| Cooling and utilities | Cooling circuits, water connections, pneumatic or hydraulic requirements and service interfaces. | Match plant utilities and machine connections; unclear interfaces frequently create avoidable installation work. |
| Trial and acceptance | Approved resin and color, machine used for trial, sample quantity, inspection items, trial evidence and acceptance responsibility. | Agree what will be measured and what evidence will be delivered before shipment, rather than deciding after the trial. |
| Packing and documentation | Drawings, component list, controller information, operation/maintenance material, packing protection and shipping documents. | List required documents and packing conditions inside the quotation so they are part of the commercial scope. |
Cavity decision
A higher cavity count can raise production potential, but it also increases mold size, shot demand, cooling load, hot-runner complexity, spare-parts exposure and maintenance responsibility. The correct shortlist is the one the plant can run and support consistently.
| Cavity | When to review it | What must be checked |
|---|---|---|
| 24 | Useful when investment control, manageable maintenance and a moderate production plan matter more than maximum hourly capacity. | Compare against 32 and 48 cavities using the same preform drawing, cycle assumption and operating hours. |
| 32 | A balanced option when 24 cavities appear restrictive but the project does not justify the machine and tooling demand of 48 cavities. | Confirm shot requirement, mold envelope, neck finish, weight and actual demand rather than selecting it as a default. |
| 48 | A serious production option for projects with proven demand and a machine capable of supporting the mold and hot-runner scope. | Give greater attention to filling balance, cooling, weight consistency, controller zones, trial evidence and service parts. |
| 64 / 72 | Consider when the capacity gain over 48 cavities is commercially justified and the plant can support higher technical and maintenance demands. | Review machine fit, utilities, handling, spare-parts plan and acceptance criteria before treating price as the deciding factor. |
Process-critical scope
The hot-runner section of a quotation should identify more than the words hot runner or valve gate. Buyers need enough detail to understand the configuration, controls, maintenance boundary and spares that support the proposed cavity count.
Installation risk
Machine compatibility is a quotation input, not a final installation check. Provide the machine model and technical sheet early enough for the proposed mold size, shot requirement, opening movement and control interfaces to be reviewed.
Machine check 1
Tie-bar spacing, platen dimensions, mounting arrangement, minimum and maximum mold height, opening stroke and ejection or take-out clearance.
Machine check 2
Total shot demand based on confirmed preform weight, cavity count and process allowance, together with the relevant injection-unit capability.
Machine check 3
Hot-runner control zones, connector standard, power, cooling-water connections, pneumatic or hydraulic services and plant conditions.
Machine check 4
Mold weight, lifting and installation plan, preform take-out, downstream handling, maintenance access and safe component replacement.
Commercial control
A lower number can result from a different material specification, runner scope, spare-parts package, trial obligation, documentation level or delivery basis. Normalize the scope first so a commercial comparison reflects the mold you expect to receive.
Are drawing revision, weight, neck finish, cavity, application and machine model identical in every quote?
Are mold components, material grades, treatments, interchangeability and purchased parts clearly identified?
Are manifold, nozzles, valve-gate system, zones, connectors, controller and spares included on the same basis?
Are trial material, machine, duration, samples, measurements, visual checks, video and acceptance responsibility defined?
Are drawings, manuals, spare parts, packing, shipping basis, warranty boundary and response path included?
Evidence before shipment
The exact acceptance standard belongs to the project drawing and commercial agreement. A practical evidence path makes the later decision easier and prevents buyer and supplier from applying different assumptions after the mold is complete.
Evidence 1
Freeze the drawing revision, resin, color where relevant, neck finish, target weight, machine and agreed operating conditions used for the trial.
Evidence 2
Review gate condition, flash, haze or whitening, contamination, incomplete filling and other appearance items relevant to the approved preform.
Evidence 3
Agree the dimensions, weight checks, cavity comparison and sampling method that will be recorded. Do not publish universal tolerances without a project source.
Evidence 4
Confirm sample quantity, trial video or images, measurement record, component list, approved changes and items that must be closed before packing.
Evidence 5
Verify preservation, protected components, loose parts, controller or accessories, documents, packing list and crate condition before release.
Project path
The site should not promise a universal delivery time before the specification and production scope are known. It should show who needs to decide what, and which evidence moves the project to the next stage.
01
Collect the drawing or sample information, application, weight, neck finish, output plan, cavity preference, machine model and destination.
02
Identify missing or conflicting data and agree which assumptions may be used for a preliminary proposal.
03
Present the recommended configuration, scope, exclusions, trial basis, documentation, packing and commercial terms on a comparable basis.
04
Review the technical definition and record approved revisions before production proceeds against the wrong requirement.
05
Track agreed milestones, changes, open issues, trial preparation, sample evidence and acceptance actions.
06
Close the evidence list, verify included items and documents, confirm packing, and maintain one communication path through shipment.
Inspect the details
A photo does not prove an entire performance claim, but a clear, accurately captioned image helps buyers inspect construction, component scope, service access and the evidence they should request for their own project. The gallery is organized by decision rather than decoration.
Start the review
Name, country, a short requirement and either email or WhatsApp are enough to start. Add the application, cavity, weight, neck finish, machine, target output and drawing when available. The response should first clarify missing inputs, not force an unsupported quotation.
Buyer questions
These answers define the information and comparison method used on this product page. Project-specific values must still be confirmed in the drawing, proposal and commercial agreement.
Start with the preform drawing or sample details, bottle application, preform weight, neck finish, preferred cavity count, injection-machine model, target output and destination country. If some items are unknown, identify them as open points so the first response can focus on clarification rather than assume a final configuration.
Compare target output, operating hours, confirmed preform weight, machine capacity, mold envelope, cooling, hot-runner complexity, maintenance resources and investment. A higher cavity number is useful only when the plant and demand can support it. Review neighboring options on the same assumptions before choosing.
The quotes may use different component materials, hot-runner and valve-gate scope, control systems, spare parts, trial obligations, documentation, packing, delivery basis or warranty boundaries. Normalize those items before treating the total price as a like-for-like comparison.
Provide the machine model and technical sheet showing platen and tie-bar space, mold-height range, opening stroke, injection-unit capacity, hot-runner controller information, utility connections and take-out arrangement. The final review must use the proposed mold drawing and the actual machine specification.
Confirm manifold and nozzle configuration, heater and thermocouple zones, actuation method, connectors, controller requirement, maintenance access, included electrical and wear spares, and the trial checks used to review filling and gate condition. Avoid accepting only a generic hot-runner description.
Agree the approved drawing and trial basis, sample quantity, appearance checks, project-specific dimensions, weight and cavity sampling method, trial images or video, measurement record, component and spare-parts list, documentation, preservation, packing list and crate condition. The commercial agreement should define final acceptance.
Continue the same decision path