A take-out robot on a preform machine is a cycle-time device, not a labour-saving accessory. On a 64-cavity mould, the preforms have to leave the mould before the next injection can begin, and how fast they leave is decided by a handshake that most plants never look at until the robot is blamed for intermittent stoppages. The robot is usually innocent. The interface timing is usually not.
Get the integration wrong and the cost shows up in three places. Mould protection signals that are too permissive allow a cycle to start with the robot still in the mould area, which is how moulds get damaged. Handshakes that are too conservative add a fraction of a second to every cycle, which on a 15-second cycle multiplied across a shift is production you never see. And part handling that looks acceptable on commissioning day fails once preform temperature drifts, because a freshly moulded preform is soft and unforgiving of the wrong gripper.
Sailwin has built injection molding machines for 15+ years, with 500+ machines delivered into 60+ countries, CE marking, ISO 9001:2015 manufacturing and a 2-year whole-machine warranty. The SW-P series covers 14 models from 170 kN to 5,500 kN, supports 64-cavity valve-gate hot runner tooling, uses a dedicated PET screw with far-infrared nano heating coils, and provides an EUROMAP 67 robot interface. This article explains what that interface carries, how to shorten the handshake without weakening safety, and how to handle preforms without introducing a new source of rejects.
Key Takeaways
- The handshake is a timing problem, not a wiring problem. A correctly wired EUROMAP 67 interface can still cost cycle time if the permit signals are sequenced conservatively.
- Never trade mould protection for cycle time. The permit signals that stop the mould closing while the robot is inside the mould area are the reason the interface exists.
- Take-out, cooling and quality are one system. Where the preform is cooled and how it is sampled determines whether automation removes rejects or moves them downstream.
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1. Why Preform Robot Take Out Is a Handshake Problem First
An injection molding machine and a take-out robot are two controllers with independent cycle logic, and the interface between them exists to keep them in step. The machine must know that the robot has finished before it closes the mould; the robot must know that the mould is open and the ejector has advanced before it enters. Everything else — speeds, gripper design, cooling fixtures — sits on top of that sequencing.
This is why a robot that was wired correctly can still cost money. If the permit signal that allows the mould to close arrives only after the robot has fully retracted to its home position, the machine waits for travel that is not strictly necessary, and the dead time appears on every cycle. Reduce it correctly and the cycle shortens; reduce it carelessly and the mould closes while the gripper is still inside the mould area.
The interface standard exists to make this discussion precise rather than improvised. EUROMAP 67 is the interface most European moulding machines and robots use, and it defines a dedicated connector plus a fixed set of signals covering operating mode, safety, mould-area position and permit conditions. Sailwin preform machines provide that interface, so the robot and the machine can exchange state rather than relying on timers that drift.
2. What an EUROMAP 67 Interface Carries, and Why Each Signal Matters
| Signal group | What it tells the other controller | What goes wrong when it is set up casually |
|---|---|---|
| Operating mode | Whether the machine is in automatic, manual, setup or a fault state, so the robot changes behaviour with the machine | The robot keeps cycling during manual setup, which is a safety and mould-damage risk |
| Safety chain | That guards, doors and emergency stops are intact on both machines before either moves | Bridged safety contacts, which pass the acceptance check and fail the audit |
| Mould area position | That the mould is open, the ejector has advanced, and the part has been ejected or removed | A signal taken from the wrong position sensor, so the robot enters before the mould is clear |
| Mould closing permit | That the robot is clear of the mould area, so the machine may start the next cycle | Set too conservatively, the permit waits for full retraction and adds dead time to every cycle |
| Part-present and quality signals | Whether a preform was successfully gripped, and whether a sample was diverted for inspection | Missing preforms are not reported, so a short shot reaches the downstream process unnoticed |
Read the table as a map of where cycle time hides. Only one row — the mould closing permit — is normally worth shortening, and it can only be shortened safely once the robot’s position sensing is trustworthy. The rest of the interface should be set strictly and left alone.
3. Timing the Take-Out Without Adding Seconds to the Cycle
The cycle on a preform machine is short, so dead time hides badly. Take a 64-cavity tool running a 15-second cycle: that is 64 preforms every 15 seconds, or roughly 15,360 preforms an hour at a theoretical 100% availability, before any allowance for stops or rejects. Add a quarter of a second of unnecessary wait after every cycle and the same tool loses around 1.7% of its theoretical output without a single alarm ever appearing.
The correct order of work is to log before you tune. Record the interval from mould-open signal to robot-entry, from grip to clear-of-mould, and from clear-of-mould to mould-closing permit. Only the third interval is normally compressible, and only to the point where the robot is genuinely clear rather than home. Sailwin machines log 40+ parameters in real time, and a parameter history that includes the mould area and ejector signals is what turns this from an argument into a measurement.
Two rules keep the tuning safe. The permit must be derived from a position the robot can prove, not from a timer that assumes travel is complete. And any change to the permit timing belongs in a documented parameter set, because the setting that gains 0.25 seconds today is the setting the night shift will adjust again tomorrow if nobody wrote it down.
Faster take-out is worth nothing if it makes the mould closing permit a guess. The signal that protects the mould is the one component of the interface that should never be tuned by feel.
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4. Part Handling, Cooling Fixtures and Quality Sampling
A preform leaves the mould at a temperature where it is still soft, which makes gripper design a quality decision rather than a mechanical one. Gripping on the neck finish is standard practice because the finish is dimensionally the most critical feature and the least tolerant of deformation; gripping on the body or on a thin wall will mark or ovalise the preform in a way that only appears after the bottle is blown. Where the preform is lightweighted, the margin for handling damage narrows further, and gripper contact area matters more than grip force.
Cooling after take-out is the second half of the cooling question. The preform continues to lose heat after it leaves the mould, so a properly designed cooling fixture lets in-mould time be used for shape and post-mould time be used for heat removal. The practical consequence is that cooling fixtures should be sized to the real production rate: a fixture that worked while the machine was being set up at low speed can saturate at full cavity output, and the symptom is preforms entering the next process too warm rather than a fault on the machine.
Quality sampling is where automation either helps or hides problems. A robot that can divert a timed sample to a chute allows dimensional and weight checks to be taken from production without stopping the machine, and it lets acetaldehyde and other checks be run on a representative preform rather than a convenience one. The opposite arrangement — where short shots and missed preforms are simply not reported — moves the defect downstream where it is far more expensive. Use the part-present signal to count, not just to interlock; a cavity that repeatedly misses is telling you something about a hot runner tip, not about the robot. Sailwin preform machines support 64-cavity valve-gate hot runner tooling and a dedicated PET screw with far-infrared nano heating coils, so the machine side of that conversation is stable enough for cavity-level monitoring to be meaningful.
5. Case Study: Take-Out Automation on a 64-Cavity Preform Tool
A preform producer automated take-out on an existing 64-cavity tool and found throughput no better than before, with intermittent stoppages that appeared only on long runs.
- Robot installed and running, but no measurable gain over manual take-out
- Intermittent stoppages that only appeared after several hours of continuous running
- No record of interface timing, so the robot and the machine were each suspected in turn
- Interface signals mapped against the EUROMAP 67 assignment and each one traced to its source sensor
- Intervals between mould-open, robot entry, clear-of-mould and closing permit logged over a full shift
- Mould closing permit re-derived from a provable robot position rather than a travel timer
- Gripper contact moved to the neck finish and cooling fixtures sized against full cavity output
- Dead time was found and removed from the handshake rather than from robot speed
- The intermittent stops were traced to a timing assumption, not to a mechanical fault
- Part handling became repeatable once gripping moved to the neck finish and cooling matched output
Scenario based on a Sailwin customer project; site-specific figures available on request during engineering review.
Frequently Asked Questions
Automate Take-Out Without Giving Up Mould Protection
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Related Reading:
• Injection Molding Machines: SW-P Series 170–5500 kN
• 64-Cavity Hot Runner Preform Mould Technology
• Preform Cycle Time Optimisation
• Preform Cooling Time: How to Set It
• Hot Runner Maintenance for Preform Moulds
• Selecting a Preform Injection Molding Machine
