Empty chute
Confirm the line response when the last cap leaves and how supply resumes without sending an uncapped bottle forward.
Cap handling
Cap chute and pre-threading for spindle cappers
How to control the closure from bulk presentation to a square, repeatable thread start.
Cap presentation
A spindle capper can only tighten the closure it receives correctly.
Bulk handling, orientation, single-file transfer, chute control and release form one process. An inverted, nested, wedged or off-centre cap can create cross-threading, missed closures and repeated stops even when the spindle settings are correct.
Pre-threading establishes a stable, square cap start before the main tightening stages. The method depends on closure geometry, neck finish, liner and tamper features, so use the production cap rather than a nominally similar sample.
Evidence to collect
- Cap drawing, dimensions and representative samples.
- Bulk orientation success and reject behaviour.
- Chute clearance through the full cap batch.
- Release position relative to the bottle neck.
- Recovery after empty chute or blocked discharge.
Process sequence
From bulk caps to a controlled thread start
| Process point | What good control looks like | Trial evidence |
|---|---|---|
| Bulk loading | Caps enter without bridging, damage or an uncontrolled surge. | Loading method, batch size and replenishment rule. |
| Orientation | Correct caps progress while wrong-way or nested closures are rejected or recirculated. | Observed reject modes across representative samples. |
| Single-file chute | Caps travel without overlap, tipping or excessive clearance. | Chute setting and cap range tested. |
| Demand control | Sensors maintain supply without overfilling or repeated feeder cycling. | Low-cap, full-chute and replenishment responses. |
| Cap release | The closure is presented at the correct height and angle as the bottle arrives. | Slow-speed observation and first-off samples. |
| Pre-threading | The cap begins squarely enough for progressive tightening without forcing a misaligned thread. | Cross-thread, high-cap and missed-cap checks. |
Recovery states
Test the cap feed when normal flow is interrupted.
Blocked discharge
Check that an obstruction is detected, safely isolated and cleared using the authorised method.
Restart after accumulation
Observe cap spacing, bottle pitch and release timing when downstream production resumes.
Choose the route
Specify the feeder, chute and capper together.
Elevators, vibratory bowls and specialist systems have different strengths. Consider closure balance, tamper features, marking risk, replenishment method and available space. Send loose caps and finished bottles with the intended line interface.
Cap-feed review
Send the actual cap family, not diameter alone.
Closure height, shape, weight distribution, liner and tamper features can all affect orientation, chute travel and pre-threading.