24 cavities leaves little margin
The 24-cavity calculation depends on excessive utilization or operating hours, while 32 creates useful production margin at the same verified cycle.
32 cavity production review
32 Cavity PET Preform Mold
Use 32 cavities when 24 is tight and 48 is not yet justified.
A 4 x 8, 32-cavity PET preform mold reference is shown. Final neck finish, preform weight, mold envelope, runner layout and machine interface follow the approved project drawing.
Cavity count
32 cavities
Output step
+33.3% vs 24 per cycle
Selection basis
Required useful output
Machine fit
Exact model review
A 32-cavity mold is a middle production decision, not a default specification. The project must prove that the extra eight cavities create useful capacity, fit the exact injection machine and avoid an unnecessary step to a 48-cavity system.
Cavity selection
32 cavities is best suited to a measured middle-capacity requirement
Use 32 cavities when it creates useful margin over 24 without adding capacity, machine demand or maintenance responsibility that the plant cannot use.
+33.3%
parts per cycle versus 24 cavities
A mathematical capacity relationship, not a promised production cycle.
48 cavities adds unused capacity
Confirmed demand cannot use the 50% per-cycle increase from 32 to 48, or the larger option creates an unnecessary machine, control or maintenance step.
The intended machine supports 32
Total shot, plasticizing, platen, tie bars, mold height, opening, controller, cooling and take-out all support the proposed 32-cavity mold.
Product definition
Define the preform before fixing the 32-cavity mold
The neck finish, weight, resin and application determine the shot, stack geometry, cooling demand and acceptance method. Cavity count alone does not define the product.
View imageMold output
32 PET preforms per completed molding cycle
Output relationship
33.3% more parts per cycle than 24; 33.3% fewer than 48
Representative use
Water, beverage and other drawing-defined PET preform programs
Neck finish
Selected from the approved preform and closure drawing
Preform weight
Defined by the approved part drawing, not by cavity count
PET material
Resin grade, color and additives supplied with the project data
Cavity layout
4 x 8 is shown in the reference; final layout follows the project drawing
Useful output
Calculated from a verified cycle and the buyer's operating plan
Available neck program
Select from the approved closure and preform drawing
PCO 1881PCO 181029/2530/25Drawing-defined finish
The list is an available program, not a claim that every neck is interchangeable in one mold. Final geometry follows the approved drawing.
Mold construction
Turn the 32-cavity concept into a defined specification
Record the material, heat treatment, alignment, cooling and 32-drop hot-runner scope used for the approved preform and machine.
View imageMold base
420 stainless steel
Core, cavity and neck ring
M333, hardened to HRC 48-51
Heat treatment
German Ipsen equipment
Hot-runner components
German HOTSET heaters with PCT nozzles and insulators
01
Stack material and treatment
Available basis
The available material basis uses a 420 stainless-steel mold base with M333 cores, cavities and neck rings hardened to HRC 48-51, with heat treatment using German Ipsen equipment.
Confirm in proposal
The quotation and approved drawing must record the final material schedule, lock-ring material and any selected surface treatment.
02
Alignment and replaceable components
Available basis
Taper matching between the core and lock ring, together with a double-taper neck-ring structure, is an available design approach for alignment and service replacement.
Confirm in proposal
The approved mold drawing must identify the selected alignment, replaceable inserts and component numbering method.
03
Cavity cooling
Available basis
Spiral independent cavity-water circuits are an available cooling approach for controlling heat removal across the 32-cavity set.
Confirm in proposal
The final circuit map and required water temperature, pressure and flow are project-specific and must match the plant utilities.
04
32-drop hot runner
Available basis
The available hot-runner component package uses HOTSET heaters with PCT nozzles and insulators. The 32-drop architecture must be designed for the approved preform.
Confirm in proposal
Define runner type, valve-gate actuation, heating zones, controller, connectors, wiring map and service parts in the proposal.
View imageQuestions the hot-runner proposal must answer
- 32-drop runner architecture and proposed balance method
- Valve-gate actuation and gate-component service method
- Heating zones, thermocouples, connectors and controller boundary
- Nozzle, heater, insulator, valve-pin and seal spare schedule
- Access method for cleaning, replacement and fault diagnosis
Machine and output
Verify the platform before treating 32 as the answer
The capacity calculation identifies the smallest standard cavity count that meets the entered output at a verified cycle. It does not prove machine compatibility.
Injection unit
32 x approved preform weight, process allowance, screw diameter, pressure and plasticizing capacity
Mold envelope
Platen size, tie-bar spacing, mold height range, mounting pattern and proposed mold drawing
Mold movement
Opening stroke, daylight, ejector or take-out clearance and mold handling method
Hot-runner control
Temperature zones, connectors, controller capacity and valve-gate actuation
Plant utilities
Cooling-water temperature, pressure and flow plus air, hydraulic and electrical interfaces
Production basis
Approved preform, PET resin, verified cycle, required output, operating hours and downtime margin
Cavity feasibility
What cycle must each cavity option achieve?
Cavity comparison
Enter weight and output
The result will show the cycle ceiling and part mass for 24, 32, 48, 64, 72 and 96 cavities. A specific recommendation appears only when a verified cycle is entered.
243248647296
The comparison does not predict cycle from preform weight. Wall thickness, geometry, PET resin, cooling water, hot runner, machine performance and quality requirements must be reviewed separately.
24 versus 32 versus 48
Compare neighboring options on one technical basis
Keep the preform, verified cycle, operating plan and machine basis identical. Otherwise the middle option cannot be evaluated honestly.
| Decision factor | 24 cavities | 32 cavities | 48 cavities | What to decide |
|---|---|---|---|---|
| Parts per cycle | 24 preforms | 32 preforms | 48 preforms | 32 adds eight parts over 24; 48 adds sixteen over 32 at the same cycle. |
| Part shot basis | 24 x approved weight | 32 x approved weight | 48 x approved weight | Add the same project process allowance and verify each option against the exact injection unit. |
| Capacity role | Controlled lower step | Middle production step | Higher-output step | Select the smallest supported option that meets confirmed demand with operating margin. |
| Runner and controls | 24-drop system | 32-drop system | 48-drop system | Compare zones, actuation, connectors, spares and service access on one technical basis. |
| Selection trigger | Already meets demand | Closes a proven 24-cavity gap | Growth can use the extra capacity | Do not choose the numerical middle option without a demand and machine calculation. |
Trial and acceptance
Review all 32 cavities before shipment
The acceptance plan must connect the approved part to the exact trial machine and conditions, then make every sample traceable to its cavity position.
01
Freeze the part basis
Approve the preform drawing, neck finish, weight, PET grade and visible quality requirements.
02
Confirm machine interfaces
Close shot, platen, tie-bar, mold-height, opening, control, utility and take-out checks before final design.
03
Record the trial condition
Run on the agreed machine with the agreed PET resin and record cooling, process settings and the verified cycle.
04
Check all 32 cavities
Confirm normal molding from all cavities and supply a complete cavity-identified 32-piece sample set for agreed checks.
05
Close shipment evidence
Provide trial video and inspection records, close corrective actions, then verify documents, spares, rust prevention and export packing.
Inspection evidence
Show the method and identify the sample
These are practical inspection references. Final records must state the approved preform, trial condition, measured feature, method and cavity identification.
View image
View image
View imageCritical spare categories
Quantities are fixed in the quotation. They are not estimated by multiplying a generic list.
- Cavity insert, core and neck ring
- Gate insert, valve pin and nozzle
- Heater, thermocouple and insulator
- Controller module and solenoid valve
- Water connectors, seals and identified fasteners
View imageEnough to begin the review
Send the preform drawing, required output and machine model. The first review should decide whether 24, 32 or 48 cavities deserve the final quotation.
32-cavity RFQ
Send the inputs that change the decision
You do not need every technical field for first contact. A drawing or clear sample, required output and exact machine model provide a useful starting point.
Preform drawing or clear sample photographs
Bottle application, neck finish and preform weight
PET resin grade, color and additives
Required preforms per hour and operating plan
Known verified cycle for a comparable preform, if available
Injection machine brand, exact model and injection unit
Reason 24 is tight and reason 48 is not preferred
What happens next
- 01Review the part drawing, weight, neck and application
- 02Compare 24, 32 and 48 on one output and machine basis
- 03Return the recommended configuration and missing technical inputs
Buyer questions
32-cavity technical FAQ
The answers explain the selection method. Exact values remain tied to the approved part, machine and trial conditions.
01Why choose a 32-cavity PET preform mold instead of 24 cavities?
Choose 32 when the additional eight preforms per cycle create useful production margin and the exact machine supports the added shot, mold envelope, controls and cooling without an unnecessary platform change.
02How much more output does 32 cavities provide than 24 cavities?
At the same verified cycle and operating condition, 32 cavities produces 33.3% more parts per cycle than 24. Real useful output still depends on downtime, rejects, changeovers and the verified process cycle.
03When should 32 cavities be compared with 48 cavities?
Compare them when forecast demand may outgrow 32, when both options fit the supported machine platform, or when 32 inherits most of the 48-cavity control and maintenance burden. Keep the part, cycle and operating assumptions identical.
04Can a 32-cavity mold run on the same machine as a 24-cavity mold?
Possibly, but it cannot be assumed. Check total shot, plasticizing, tie-bar spacing, platen, mold height, opening, controller zones, cooling, valve-gate actuation and take-out against both proposed mold drawings.
05Which neck finishes can be reviewed for a 32-cavity mold?
The available program includes PCO 1881, PCO 1810, 29/25 and 30/25, with other finishes reviewed from the approved preform and closure drawing. These finishes are not interchangeable within one mold unless specifically designed and agreed.
06What should be delivered after the 32-cavity mold trial?
Request the recorded trial basis, a complete cavity-identified 32-piece sample set, agreed neck, weight, gate and appearance checks, trial video, basic inspection records and closure of any failed acceptance point before packing.
Next decision