Bottled water production: solve one problem
Startup Rejects After Bottle Changeover: Separate the Conversion from the First Good Run
Mechanical changeover can be finished while the line is still making rejects or waiting for quality release. One total downtime figure hides whether the loss comes from format work, mismatched materials, trial running or an acceptance decision.
Start with the approved old-to-new format pair, identified change parts and signed recipe/material checks. Trace the first defective bottle through the connected machines. Record mechanical completion, first conforming sample and quality release as different milestones.
Use a changeover clock with clear endpoints
Define where the clock starts and ends: last approved old-format output, safe conversion, trial, first conforming new-format sample and quality release. Keep event timestamps and overlapping work. A machine's local conversion time and a line's released-output interruption are different measures.
Freeze both old and new bottle, neck, closure, label, message and pack revisions. Keep actual machine serials, recipes and part identifiers. A copied recipe name is not evidence that the intended physical format parts and approved materials were installed.
Illustrative non-overlapping ledger: 18 minutes of format work plus 12 minutes of trials plus 15 minutes of quality hold equal 45 minutes. These are planning values, not Allot Tech performance. Concurrent tasks must not be added twice, and waiting time should not be hidden inside a faster mechanical-change claim.
Find the first old/new-format mismatch
Keep startup, stable and restart samples separately. Identify where the first defect becomes visible before later rejects or alarms propagate across the line.
| Pattern | Evidence | Review boundary |
|---|---|---|
| New bottle contacts one retained guide or pocket | Old/new drawings, installed part IDs and safe observations | Serial-specific format parts and handoff compatibility |
| Old caps, labels or codes appear in the new run | Material clearance, approved lots and job-change records | Old/new material and data separation, not speed alone |
| Individual machines pass but connected startup fails | Linked first-bottle samples, sequence and transfer state | Connected readiness and interface responsibility |
| Mechanics complete but released output remains delayed | Trial results, hold reason, decision owner and timestamps | Acceptance and quality hold separated from conversion work |
Retest the defined format pair
This is not a live changeover or PLC-programming guide. Qualified personnel must follow isolation, guarding, cleaning and OEM procedures. Do not adjust moving guides, disable rejects or skip quality release to improve a stopwatch result.
- 01
Preserve the old/new approved revision set, original recipes, format-part list and baseline event log.
- 02
Use the site's clearance and verification procedure to confirm materials, messages and installed parts; record unknowns instead of assuming equivalence.
- 03
Have the responsible specialist approve one permitted correction at the first mismatched interface and document the retained components.
- 04
Repeat the agreed conversion, startup, stable run and restart sequence using the same endpoint definitions and quality sampling.
- 05
Review new-format output and old/new segregation with quality. If return conversion is required, test it separately rather than inferring it from one direction.
Buy a defined changeover scope
A wrong part or mixed material requires a different corrective scope from a coordinated-startup problem. A long quality hold is not proof that another change-part kit will shorten the interruption. Separate these evidence paths before requesting automation.
Ask Allot Tech for a written format-pair matrix: retained/changed parts, settings responsibility, material/data clearance, permitted cleaning, required tools, connected milestones and acceptance endpoints. No universal kit, guaranteed conversion time or unsupported bottle-range extension is implied.
- Machine serials and old/new approved package revisions
- Recipe/job versions and installed format-part identifiers
- Material clearance, lots and code-message approvals
- First-defect samples with linked machine checkpoints
- Non-overlapping conversion/trial/hold timestamps
- Required conversion directions and responsible acceptance owners
Questions buyers ask
Does a completed mechanical change mean the line is ready for saleable output?
No. Confirm materials, recipe/data, connected transfer, new-format quality and release. Keep mechanical completion, first conforming sample and release as separate records.
Can one successful size change prove all formats and the reverse change?
No. Qualify the required old-to-new pair and return direction using approved revisions. Other formats, part sets or connected conditions need their own evidence.
Related troubleshooting guides
Water filling machine low output
Water filling machine low output →Water bottle shrink-pack problems
Water bottle shrink-pack problems →Cap leaks after capping
Cap leaks after capping →Wrinkled or skewed bottle labels
Wrinkled or skewed bottle labels →Uneven fill levels and underfill
Uneven fill levels and underfill →Conveyor jams and tipping
Conveyor jams and tipping →Missing or unreadable date codes
Missing or unreadable date codes →Wet bottles after drying
Wet bottles after drying →Missing or extra bottles in packs
Missing or extra bottles in packs →Ask Allot Tech to review the evidence
Send your machine identification, package drawing and timed observations. State what is unknown so the proposed scope follows the actual problem.