Threaded screw caps
Review pickup, square thread start, bottle restraint and the appropriate chuck, spindle, belt or other tightening method. Define how application is approved.
Pack samples and machine selection
Bottle and closure compatibility guide for capping machinery.
Document the complete bottle-and-closure system before selecting cap application tooling, cap feeding, bottle control or acceptance tests.
Define the evidenceRecord the conditions, responsibilities and approved result before final machinery configuration.
Use production-intent samplesConfirm suitability with the actual bottle, closure and line context.
Carry results into acceptanceUse the same definitions through quotation, trial, FAT, SAT and handover.
Answer first
Nominal cap diameter is not enough to confirm capping-machine compatibility.
Machine selection depends on the closure profile and thread, bottle finish and rigidity, liner or seal, tamper feature, filled condition and the way the component must be presented. Production-intent samples and supplier information should be reviewed as one pack system.
| Format field | Information to capture | Machine decision affected |
|---|---|---|
| Bottle and neck | Material, body shape, filled weight, rigidity, neck finish, support ring, height, diameter and tolerance information where available. | Guides, clamps, side belts, neck support, conveyor pitch, head height and resistance to spinning or deformation. |
| Closure body | Material, outer profile, height, ribs, skirt, thread, top surface, liner and any cosmetic surface that must not be marked. | Chuck or insert, spindle or belt contact, feeder tooling, pickup method, clutch or head setting and inspection. |
| Tamper feature | Band, bridges, pilfer-proof feature, induction liner or other feature relevant to the finished pack. | Application method, tooling clearance, cap-position checks, opening or tamper acceptance and downstream sealing interfaces. |
| Pump or trigger | Nozzle orientation, trigger shape, closure centre of gravity, tube material, length, curvature and stiffness. | Bulk handling, bowl or track design, gripper, tube guide, insertion route, bottle restraint and recovery from incomplete placement. |
| ROPP pack | Aluminium cap construction, liner, bottle finish and any supplier requirements for forming or opening. | Top pressure, roller tooling, head setup, thread and pilfer-band formation and finished-pack checks. |
| Product condition | Dry or wet neck, residue, foaming, filled temperature, bottle pressure or other condition that may be present at capping. | Grip, cleanliness, bottle stability, torque or sealing behaviour and the conditions used during trials. |
| Format relationship | Which bottles share closures, which closures share bottles, change frequency and expected batch size. | Number of change parts, stored settings, line-clearance method, sample plan and upgrade route. |
Compatibility by capping route
Use the closure behaviour to select the application principle.
ROPP aluminium caps
Treat cap, liner, bottle finish, top pressure and roller tooling as one system. Include thread, pilfer-band, opening and seal checks as required by the pack.
Pumps and triggers
Add orientation, tube handling and insertion to the compatibility review before the closure is tightened.
Automatic cap feeding
Test the closure in bulk, at low level, during refill, through recirculation and after stop/restart. A part that can be tightened may still be unsuitable for the proposed feeder.
Build the sample and trial matrix
Represent normal tolerances and the formats that create the greatest handling risk.
Supply enough components for setup, stable running, quality checks, fault recovery and changeover. Mark each sample family so results can be traced to the correct bottle, closure and product condition. Where supplier tolerances or multiple component sources exist, include those variants rather than relying on a single ideal sample.
| Trial record | What to retain |
|---|---|
| Sample identity | Component source, batch or reference, format code, photographs or drawings and the approved finished pack where available. |
| Machine configuration | Tooling, guides, head or roller setup, feeder parts, stored settings and any bottle support used. |
| Observed risk | Nesting, deformation, tube tangling, cross-threading, bottle spin, poor thread formation, cap marking or other relevant failure mode. |
| Acceptance method | Cap position, visual standard, torque or opening method, leak or tamper check and sample frequency. |
| Open item | Any product, site interface, tolerance, safety or long-run condition not represented during the test. |
Carry this matrix into the machine trial, quotation checklist and FAT/SAT plan.