What spindle wheels do
In an inline spindle capper, rotating wheels contact the closure and progressively tighten it as the bottle travels through the capping station. The wheels must grip reliably without damaging the cap or pulling the bottle out of alignment.
The correct setup depends on cap diameter, cap height, cap surface, bottle stability, conveyor speed, side belt support and the target torque range.
Cap finish and marking
Presentation-sensitive caps may need gentler contact and careful setup to avoid scuffing. Ribbed caps, smooth caps, metallic finishes and decorated closures can all behave differently.
A cap that looks acceptable by hand may show marking when run at speed, so sample testing is important before a final recommendation is made.
Setup factors
Wheel pressure, wheel height, spindle angle, conveyor speed, bottle guides and side belt pressure all contribute to final pack quality. A problem blamed on wheel material may actually be caused by bottle movement or poor cap presentation.
Record settings for each format so operators can return to proven conditions instead of adjusting by trial and error.
When to discuss wheel options
Discuss wheel contact early if the cap finish is soft, glossy, decorated, narrow, unusually tall, difficult to grip or used on a lightweight bottle.
Lancing UK can review the closure sample and advise whether an inline spindle capping machine is suitable or whether another capping approach should be considered.
Quick answers
Can spindle wheels mark caps?
They can if setup or cap finish is unsuitable, so samples should be tested for presentation-sensitive closures.
Do all caps suit spindle capping?
Many screw caps do, but cap shape, surface, rigidity and bottle stability need checking.
What else affects cap contact?
Side belts, guides, speed, bottle stability and cap presentation all affect the result.