Understanding Cap Sealing: Choosing the Right Capping Machine

Views: 2446 Author: Howie SUN Publish Time:
Two quotations that look different usually differ in four numbers: the slowest station, the changeover time, the CIP time and the consumable cost. Factors to consider when selecting a press capping machine include the applied pressure, cap size compatibility, and production speed requirements.
Key facts at a glance
ScopeFilling, capping, labelling and packing equipment
Sizing basisDemand in units per day, divided by productive hours and a production factor
Production factor0.65-0.85 depending on formats and changeovers
Key controlFill accuracy, closure integrity, changeover time
Key decisionOne flexible line or two dedicated lines
AcceptanceOutput, accuracy, closure and changeover, measured

What actually decides the shortlist?

Four inputs fix the shortlist: the product, the package, the daily demand and the number of formats per week. Everything else, including the brand of the PLC, is a detail that can be settled after those four are written down.

Factors to consider when selecting a press capping machine include the applied pressure, cap size compatibility, and production speed requirements.

What is the first question to settle before choosing equipment?

Settle the product and the package before the machine. Product viscosity, acidity, carbonation and particle size decide the filling principle; the bottle neck finish decides the capping head and the change parts. A machine chosen before those two are fixed is chosen twice.

When selecting a screw capping machine, consider factors such as speed, torque control, and bottle compatibility to ensure efficient operation.

DecisionWhat it fixesWhat it does not fix
Filling principleProduct and accuracyDownstream capacity
Valve countRated BPHChangeover and CIP time
Automation levelLabour per shiftProduct quality
Line layoutFloor space and flowThroughput of the slowest station

The Gravity Filling Machine for Still Water is the matching unit when this becomes a line project.

Where does a filling line lose output that the specification ignores?

Changeover, CIP, label roll changes and downstream stops. A line rated at 12,000 BPH and run with four formats and two changeovers per shift delivers closer to 8,000. The production factor is not a discount on the machine; it is what the plant actually gets.

Throughput and change-part lists are on the Volumetric Filling Machine for Still Water page rather than in this note.

When should a plant buy two lines instead of one flexible line?

When the formats are far apart, or when one product cannot tolerate the cleaning regime of the other. A single flexible line carries changeover cost every day; two dedicated lines carry capital cost once. The crossover is usually visible in the annual changeover hours.

The same question is worked through from another angle in Algeria & Morocco Beverage Bottling: A Maghreb Market Entry.

How should a line layout be reviewed before signing?

At 1:100, with conveyor radii, maintenance access and the largest format drawn in. Most layout problems appear as a service door that cannot open or a pallet that cannot turn. Fixing them on paper costs nothing; fixing them on site costs weeks.

How to read the numbers. The BPH figures quoted are reference ranges on the product specification. Changeover, cleaning and downstream stops are not inside a rated BPH, so plan with a production factor of 0.65-0.85.

Frequently asked questions

What is the difference between BPH and bottles per minute?

BPH is bottles per hour; divide by 60 for bottles per minute. A 12,000 BPH line runs at 200 bottles per minute, and every downstream machine has to carry that rate.

How long does a filling line last?

A well-maintained stainless line runs for well over a decade, with wear parts replaced on condition. The variables are water quality, cleaning regime and whether spare parts are kept in stock.

Can a line be upgraded later?

Capacity is usually added by a second line or by a downstream upgrade, not by speeding up the filler. The filler, the capper and the packer are matched, so raising one alone moves the bottleneck.

What drives the price of a filling line?

Valve count, automation level, material of construction, whether blowing is included, and the packing format. Price follows the specification, so two quotes are only comparable when the specifications match.

How much production factor should I use for a new line?

Between 0.65 and 0.85. A single-format line on one shift sits near 0.85; a line with four formats and two changeovers per shift sits near 0.65.

Key takeaways
  1. Fix the product and the package before the machine.
  2. The production factor is what the plant gets, not a discount.
  3. Buy the long-lead spares with the machine.
  4. Ask for the FAT procedure before the price.
About the author
Written by the Sunswell engineering team - led by Howie SUN, Founder & CEO, with 14 years in filling and blow-moulding equipment R&D and turnkey project delivery across 71+ countries.
Last reviewed: 2026-08-28 . Reviewed by Sunswell engineering team
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