Sep 22, 2026
An Automatic Blow Molding Machine Factory Acceptance Test: What Buyers Should Check review confirms whether the equipment matches the agreed specification before shipment. I use the FAT to verify machine identity, mold performance, output, cycle time, product quality, safety systems, utilities, documentation, and unresolved deviations. A machine movement demonstration is not enough; the buyer should require stable production under the actual resin, mold, product design, and process conditions.
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An automatic blow molding machine factory acceptance test is a documented inspection and production trial conducted at the manufacturer’s factory before the machine is packed and shipped. I treat it as a contract-based verification process rather than a general demonstration. The test compares the completed machine against the approved technical specification, drawings, mold requirements, sample standards, utility schedule, and agreed commercial terms.
The FAT should be planned before the machine is finished. The buyer and supplier should agree on the test date, responsible personnel, test materials, product drawings, sampling method, acceptance limits, instruments, safety requirements, and document format. If these points remain undefined, the buyer may see acceptable-looking bottles without having objective evidence that the equipment can meet production requirements.
Cangzhou Yi Sunda Mechanical Technology Co.,LTD describes its equipment range as covering automatic and semi-automatic blow molding systems for PP, PE, HDPE, and other plastic containers, including bottle, chemical packaging, lubricant, food packaging, pesticide, barrel, and large hollow applications. Its published company information also identifies more than 20 years of blow molding experience, export activity in more than 80 countries, over 3,000 installations, and online technical support. These company details are useful background, but the FAT remains the point at which a specific machine must prove its agreed performance.
I recommend using the following numbered checklist as the structure for the buyer’s inspection record. Each item should have a measurable result, an acceptance limit, a responsible person, and a status such as Pass, Conditional Pass, or Fail.
The protocol should identify the machine model, serial number, cavity count, mold number, product name, product volume, resin grade, target output, target cycle time, and required utility conditions. It should also define the test duration and sample size. For example, the parties may agree to run continuously for two to four hours and inspect at least 30 consecutive products after process stabilization, but the actual values must match the purchase contract.
I also include a responsibility matrix showing who supplies resin, mold components, gauges, packaging materials, test operators, and laboratory equipment. The document should specify whether the trial covers only the main machine or also includes conveyors, leak testers, trimmers, labeling equipment, vision inspection, packing equipment, and other downstream units. A signed protocol prevents the factory from substituting a short demonstration for a production-readiness test.
Before energizing the machine, I compare the physical equipment with the approved quotation, general arrangement drawing, electrical list, mold specification, and purchase order. I check the extruder size, die head type, number of heads, clamping force, maximum product volume, hydraulic or servo configuration, control cabinet, robot or take-out system, and included accessories. The machine nameplate, motor ratings, component brands, and serial numbers should be recorded with photographs.
The buyer should also confirm that the tested mold is the mold included in the order. A supplier may demonstrate a similar bottle using another mold, but that does not prove the purchased mold will produce the required container. I record mold cavities, neck finish, parting line, cooling channels, parison programming requirements, trimming provisions, and any interchangeable components.
The document review should cover the operating manual, electrical drawings, pneumatic diagrams, hydraulic diagrams, spare-parts list, recommended maintenance schedule, PLC backup, HMI program backup, alarm list, lubrication chart, utility schedule, and parts catalog. I also request calibration records for pressure gauges, temperature sensors, scales, leak testers, and dimensional instruments used during the trial.
The supplier should provide the machine’s applicable compliance documents, risk assessment, safety circuit description, emergency-stop test record, and declaration or certificate required by the buyer’s destination market. Installation readiness includes foundation dimensions, machine weight, lifting points, power requirements, compressed-air quality, cooling-water requirements, exhaust needs, and space for service access. Missing documents should be listed as deviations rather than treated as minor administrative issues.
I test every emergency-stop button and record the response of the extruder, mold movement, take-out system, heaters, and auxiliary equipment. Opening a guarded area should produce the specified stop condition, and the machine should not restart automatically when the guard is closed. Safety switches, light curtains, door interlocks, pressure protection, over-temperature alarms, and low-air or low-water alarms should be tested individually.
The FAT should include alarm recovery rather than only alarm activation. I ask the operator to demonstrate what appears on the HMI, whether the alarm is recorded, how the fault is cleared, and whether the machine returns to a safe state. A safety function that stops the machine but leaves unclear reset conditions can create production and maintenance risks after installation.
A dry run checks machine movement without resin or with the process in a controlled setup. I observe mold opening and closing, parison cutter operation, die-head movement, take-out motion, bottle transfer, trimming, conveyor synchronization, and auxiliary equipment communication. The inspection should identify abnormal vibration, oil leakage, air leakage, mechanical interference, unusual noise, unstable positioning, and excessive temperature rise.
I also compare programmed movement sequences with actual timing shown on the HMI or control system. The dry run should include manual, semi-automatic, and automatic modes where applicable. Recipe loading, parameter locking, user permissions, language settings, data storage, and power recovery should be checked before the production trial begins.
The most important part of the automatic blow molding machine FAT is a realistic mold trial. I use the approved mold, the agreed resin grade, the specified color or masterbatch, and the final product drawing. The supplier should record extruder temperatures, die-head temperatures, parison programming data, blow pressure, cooling conditions, mold-close timing, extrusion time, and total cycle time.
The trial should not begin with a heavily optimized condition that cannot be reproduced by the buyer. I request the complete recipe, including set values, actual values, correction factors, and operator adjustments. If the machine needs manual intervention during production, the frequency and reason should be recorded because a stable automatic cycle must not depend on hidden operator corrections.
For blow molding machine performance verification, I measure actual good pieces per hour rather than relying on the theoretical cycle displayed by the HMI. The record should include cavity count, cycles per minute, rejected pieces, start-up waste, stoppages, and net acceptable output. A practical calculation is:
Net output per hour = accepted pieces ÷ test hours
I also compare the measured cycle time with the contractual target. If the target is 20 seconds per cycle on a four-cavity mold, the theoretical gross output is 720 pieces per hour, but the FAT report must separate theoretical output from accepted output after rejects and interruptions. The buyer should define whether the acceptance limit applies to gross production, net good production, or both.
Product inspection should cover weight, height, diameter, neck dimensions, thread or finish, capacity, wall thickness, appearance, leakage, and functional performance. I use calibrated scales, vernier calipers, gauges, wall-thickness equipment, and leak-test instruments. The acceptance limits should come from the approved product drawing or written quality specification rather than an informal visual judgment.
For a 30-piece sample, I record individual results instead of reporting only an average. This makes it possible to identify cavity-to-cavity variation, top-to-bottom thickness imbalance, unstable parison programming, flash, sink marks, whitening, thin corners, deformation, contamination, or poor trimming. If the bottle requires a pressure, vacuum, stacking, drop, or torque test, those tests should be performed using the buyer’s defined method.
Parison programming is critical for containers with handles, ribs, uneven geometry, or controlled wall distribution. I compare the programmed parison profile with measured wall thickness at the agreed inspection points. The supplier should show how the profile is edited, saved, protected, copied, and restored after a parameter change.
Recipe recovery is tested by saving the approved settings, changing selected parameters, shutting down the control system, and restoring the original recipe. The machine should return to the approved production condition without unexplained loss of data. I also check whether unauthorized users can change critical values such as temperature, blow pressure, cycle timing, and parison points.
The utility inspection should record electrical voltage, current, power demand, compressed-air pressure, compressed-air flow, cooling-water temperature, water flow, and other required services. Compressed-air consumption should be measured under the agreed production condition, not estimated from a catalog value. The report should state the measuring instrument, test duration, operating pressure, and whether the value represents average or peak consumption.
I test communication with conveyors, leak testers, trimming units, vision systems, bagging equipment, and other downstream equipment included in the order. Signals for start, stop, product full, reject, emergency stop, and fault status should be demonstrated. A machine that produces bottles correctly but cannot exchange reliable signals with the production line has not completed an integrated acceptance test.
Buyers should check more than whether the machine produces one acceptable bottle. The essential checks are contractual scope, safety functions, automatic operation, output, cycle time, product dimensions, wall thickness, leakage, utility consumption, recipe recovery, alarms, changeover, downstream communication, documentation, and deviation closure. Each check should have an agreed measurement method and a defined pass or fail limit.
I also recommend testing restart behavior after a controlled stop, material interruption, power interruption, alarm condition, and emergency stop. The operator should demonstrate whether the machine can return to production without producing an uncontrolled quantity of scrap. Changeover time should be measured from the final accepted piece of one product to the first accepted piece of the next product, with the activities included in the measurement clearly stated.
A factory acceptance test takes place at the supplier’s facility before shipment, while a blow molding machine site acceptance test takes place after delivery, installation, connection, and commissioning at the buyer’s plant. FAT primarily verifies manufacturing completion and production capability under controlled factory conditions. SAT verifies whether the equipment performs correctly with the buyer’s actual utilities, operators, factory layout, upstream material handling, and downstream production line.
The two tests should use related criteria but not be treated as identical. A machine may pass FAT with stable factory utilities and still require SAT adjustments because the buyer’s compressed air, cooling water, power quality, floor level, resin handling, or line integration differs. The purchase agreement should define which FAT results become binding at SAT and which unresolved FAT deviations remain the supplier’s responsibility.
| Test area | Factory acceptance test | Site acceptance test |
|---|---|---|
| Location | Supplier’s factory | Buyer’s production site |
| Main purpose | Verify machine build and agreed production capability | Verify installation and site operation |
| Utilities | Factory test utilities | Buyer’s actual utilities |
| Product trial | Approved mold, resin, and sample conditions | Buyer’s production conditions |
| Typical evidence | FAT report, test data, photos, deviation log | SAT report, commissioning record, training record |
| Commercial effect | Shipment and payment decision | Final handover and warranty start conditions |
I require the supplier to prepare a complete evidence pack before final approval. It should contain the FAT protocol, compliance matrix, utility schedule, approved product drawings, machine and mold photographs, test records, dimensional data, output calculations, alarm results, recipe backups, calibration records, maintenance documents, and operator training records.
Every deviation should have a reference number, description, location, severity, corrective action, responsible party, due date, and closure evidence. A cosmetic issue may be accepted with a defined correction date, while a failed safety interlock, unstable output, missing control software backup, or excessive wall-thickness variation should normally prevent unconditional acceptance.
Commercial terms should link FAT status to payment release and shipment authorization. I recommend using three categories: Accepted, Accepted with Open Items, and Rejected Pending Correction. The contract should state whether open items permit shipment, whether a retention amount remains unpaid, when the warranty begins, and who pays for repeat testing caused by a failed FAT.
I do not recommend signing final acceptance immediately after a successful demonstration. First, I compare the measured results with every contractual requirement, confirm that all required samples and records are complete, and verify that the supplier has closed or formally assigned each deviation. The final sign-off should identify the tested machine, mold, product, resin, test date, participants, acceptance status, and remaining obligations.
The central purpose of an Automatic Blow Molding Machine Factory Acceptance Test: What Buyers Should Check process is to distinguish machine movement from stable production capability. For a Plastic Bottle Blow Molding Machine, I would approve shipment only after the agreed mold produces the required product at the specified output, cycle time, quality limits, utility conditions, and safety standard. The buyer should retain the signed FAT report, approved recipes, test data, photographs, videos, deviation log, and document pack as part of the purchase and warranty record.
