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Calculating the production capacity of a Bottom Sealing Machine requires more than reading a maximum speed from a brochure. Real capacity depends on planned production time, stop time, cycle rate, bags produced per cycle, and the share of bags that meet your quality requirements. This guide explains the calculation step by step, shows how to convert rated speed into accepted bags per shift, and helps buyers compare equipment using realistic output. It is written for packaging manufacturers evaluating a Bottom Sealing Machine from Chovyting Machinery or another supplier.
A Bottom Sealing Machine produces bags by forming a seal across the bottom of the bag through a suitable film presentation and processing arrangement. Its production capacity should be measured in accepted finished bags within a defined period, not simply in mechanical cycles per minute.
Use this basic formula:
Estimated accepted bags = run time × average cycle rate × bags per cycle × (1 − reject rate).
Run time is the time the machine is actually producing after subtracting stop time from planned production time. The average cycle rate must match the bag specification, film, lane arrangement, and operating conditions being evaluated.
For example, if a configuration runs for 400 minutes at an average of 100 cycles per minute, produces two bags per cycle, and has a 2% reject rate:
Estimated accepted bags = 400 × 100 × 2 × 0.98 = 78,400 bags.
This is an illustrative calculation. It is not a performance claim for any Chovyting machine or a substitute for a factory acceptance test.
Start by reviewing the relevant bottom sealing bag making machines. Then request output data for your actual bag dimensions, film specification, and proposed configuration.
Capacity calculations become unreliable when buyers mix shift length, breaks, planned maintenance, changeovers, and unplanned stops without defining them.
Planned production time is the time intended for production. Run time is the portion of that time when the machine is actually producing.
Run time = planned production time − stop time.
Define whether changeovers are included in planned production time or excluded from it. The important rule is consistency: do not subtract the same changeover twice, and do not exclude it from planned time while also treating it as an availability loss.
● State the shift length and the planned production window.
● Record planned maintenance separately from unplanned downtime.
● Define whether changeovers are included in the calculation.
● Record material shortages, quality checks, and minor stops separately where possible.
● Use the same time boundary when comparing machines or shifts.
For example, a 480-minute shift with 30 minutes of planned breaks has 450 minutes available for planned production. If the machine stops for 50 minutes during that period, run time is 400 minutes.
A Bottom Sealing Machine may be described using cycles per minute or bags per minute. These are not always the same figure.
Use this formula when the supplier provides cycles per minute:
Bags per minute = average cycle rate × bags per cycle.
Bags per hour = bags per minute × 60.
For example, 100 cycles per minute with two bags per cycle equals 200 bags per minute, or 12,000 bags per hour while running.
If the supplier provides bags per minute, confirm whether the figure is total machine output or output per lane. A multi-lane machine may produce more than one bag in each cycle.
Chovyting lists the CW-1100BS5 multi-line bottom sealing machine. Its published description refers to a maximum of five lines for calendar bag production. A maximum lane capability does not automatically mean that every bag width, film, or product can use all five lanes.
● Ask whether the quoted speed is total output or output per lane.
● Confirm the number of bags produced in each cycle.
● Confirm the bag width, length, film, and lane arrangement used in the test.
● Ask whether the rate is a rated maximum, demonstrated rate, or average production rate.
● Request accepted-bag output rather than total produced bags where quality matters.
Downtime reduces the time available for production. It includes breakdowns, material shortages, cleaning, quality interventions, and changeovers when those events occur within the planned production window.
Do not assume that a machine running at its maximum speed for one minute will maintain that rate for a full shift. Short stops, film splices, sensor cleaning, and adjustments can reduce output substantially.
● Record every stop with its duration and cause.
● Separate planned maintenance from unplanned downtime.
● Define whether changeovers are included in the capacity calculation.
● Track minor stops separately from long breakdowns.
● Review recurring causes before increasing the target speed.
For example, if 450 minutes are planned for production and the machine stops for 50 minutes, availability is 400 ÷ 450 = 88.9%. The remaining 400 minutes are available for the output calculation.
Availability is useful for identifying whether downtime, rather than machine speed, is the main constraint.
Production capacity should ultimately be expressed in accepted bags. A bag that is produced but does not meet the agreed requirements should not be counted as saleable output.
Use this formula:
Accepted bags = total bags produced × (1 − reject rate).
For example, if a machine produces 80,000 total bags and 2% do not meet the agreed requirements, accepted output is 78,400 bags.
Define “accepted” before the test begins. It may include dimensional tolerance, seal quality, cutting quality, print registration, bag count, and packaging requirements.
● Agree on the inspection method and sampling frequency.
● Define the maximum permitted dimensional variation.
● Specify seal, cut, and print acceptance criteria where relevant.
● Record rejected bags by defect type.
● Keep rejected and accepted samples for review.
Do not treat reworked bags as accepted output unless your quality system explicitly defines them that way. Consistency matters more than the particular rule chosen.
Send Chovyting Machinery your bag dimensions, film specification, target output, shifts, and downtime records. Ask for a configuration review and an output test plan based on accepted bags.
This manual worksheet converts operating assumptions into estimated accepted output. Use observed or demonstrated rates for the exact product and configuration rather than copying an unexplained maximum-speed figure.
| Input | Definition | Illustrative value |
|---|---|---|
| Planned production time | Time intended for production, excluding periods with no intention to produce | 450 minutes |
| Stop time | Stops within planned production time, including relevant changeovers | 50 minutes |
| Average cycle rate | Average cycles per minute during the remaining run time | 100 cycles/minute |
| Bags per cycle | Total bags produced in each cycle across active lanes | 2 bags |
| Reject rate | Rejected bags divided by total bags produced | 2% |
Run time = planned production time − stop time.
Estimated accepted bags = run time × average cycle rate × bags per cycle × (1 − reject rate).
Example: (450 − 50) × 100 × 2 × 0.98 = 78,400 accepted bags.
Estimated accepted bags per hour = 78,400 ÷ (450 ÷ 60) = approximately 10,453 accepted bags per hour.
If stop time falls to 30 minutes and reject rate falls to 1%, with the same running rate, the estimate becomes (450 − 30) × 100 × 2 × 0.99 = 83,160 accepted bags.
That is 4,760 additional accepted bags, or approximately 6.1% more, without increasing the running speed. These figures are illustrative assumptions, not Chovyting performance claims.
Calculation limits: do not multiply by lane count again if the input rate already represents total bags per minute. Do not subtract the same stop twice. For changing products, rates, or active lanes, calculate each production segment separately and add the results.
Overall equipment effectiveness, or OEE, helps explain why a machine produces less than its applicable potential. It combines availability, performance, and quality.
Availability = run time ÷ planned production time.
Performance = (ideal cycle time × total bags produced) ÷ run time.
Quality = accepted bags ÷ total bags produced.
OEE = availability × performance × quality.
Use fractions in the multiplication, then express the result as a percentage. The ideal cycle time should be realistic for the product, film, and configuration being evaluated.
For example, using the worksheet assumptions:
● Availability = 400 ÷ 450 = 88.9%.
● Total bags produced = 400 × 100 × 2 = 80,000 bags.
● If the ideal rate is 100 cycles per minute with two bags per cycle, performance = 100%.
● Quality = 78,400 ÷ 80,000 = 98%.
● OEE = 88.9% × 100% × 98% = approximately 87.1%.
OEE is useful for diagnosis, but it is not a substitute for a capacity calculation. It shows where losses occur; the capacity worksheet estimates the accepted output those conditions produce.
Do not multiply the worksheet result by OEE again. The worksheet already accounts for its stated stop, running-rate, and reject assumptions; applying the same losses twice would understate output.
Multi-line production can increase bags per cycle, but it does not guarantee that every bag size can use every lane. Bag width, film width, tooling, and sealing arrangements determine the usable configuration.
Chovyting also lists the CW-1100BS5+AP calendar bag making machine. Its published description refers to five-line production for blank and printed calendar bags, with an optional punch. Confirm the exact model and configuration before using any published figure in your capacity plan.
For mixed products, calculate each product separately:
● Product A: define its run time, cycle rate, bags per cycle, and reject rate.
● Product B: repeat the calculation with its own conditions.
● Add the accepted bags from each product.
● Add changeover time only once for each transition that occurs within the measured period.
Do not average unlike products into one cycle rate. A wide bag, thick film, printed product, or different lane arrangement can have a different practical operating rate.
A factory acceptance test, or FAT, should verify the agreed capacity under defined conditions before shipment. It should test the actual product, film, and configuration rather than relying only on a promotional demonstration.
● Agree on the film specification, bag drawings, and representative products.
● Define the test duration, lane arrangement, and staffing.
● Record total bags, accepted bags, rejects, stop time, and interruptions.
● Check dimensions, seal quality, cutting, print registration, and bag count where applicable.
● Include a representative changeover if multiple products are part of the purchase.
● Document deviations, corrective actions, and any retest requirements.
A running video can support the record, but it should not replace agreed acceptance criteria. If travel is impractical, discuss remote witnessing or a suitably scoped independent inspection.
Chovyting Machinery publishes information about installation, commissioning, training, and maintenance support. Confirm the project-specific scope so the demonstrated capacity can be supported during production startup.
If the supplier provides cycles per minute, multiply by bags per cycle and by 60. Then apply the expected reject rate if you need accepted output. Confirm whether the cycle rate is total output or output per lane.
No. Rated speed is a stated operating capability under defined conditions. Production capacity should account for run time, stops, changeovers, reject rate, and the actual bag specification.
First confirm the usable lane arrangement for your bag width and film. Then use total bags per cycle, not lane count alone. Do not multiply a total-output rate by the number of lanes again.
Yes, if the changeover occurs within the planned production period being measured. Define the calculation boundary consistently and avoid subtracting the same changeover twice.
Use a rate based on your own production records or an agreed test result for the same bag specification and material. Do not use a generic industry percentage as proof of future performance.
Total bags include every bag produced. Accepted bags are only those meeting the agreed quality requirements. Capacity planning for sales and delivery should normally use accepted bags.
No. OEE helps identify availability, performance, and quality losses. A capacity calculation estimates accepted output for a defined period. Use both, but do not apply the same losses twice.
Send bag samples or drawings, film specifications, target accepted output, available shifts, downtime records, reject categories, and destination requirements. These details help the supplier review the configuration and propose an appropriate test plan.
Share your bag specifications, production targets, and downtime data with Chovyting Machinery. Ask for a capacity-based configuration review and a factory acceptance test plan.
● Bottom Sealing Bag Making Machines — Explore the relevant product category before preparing a capacity-based quotation request.
● CW-1100BS5 High Speed Bottom Sealing Bag Making Machine — Review the model associated with multi-line bottom sealing applications.
● How to Record Downtime Causes on a Bottom Sealing Machine
● How to Compare Rated Speed and Accepted Output During a Machine Test
● How to Calculate Changeover Capacity for Multi-Product Bottom Seal Production
The production capacity of a Bottom Sealing Machine should be calculated from accepted bags produced within a defined planned production period. Convert cycle rate into bags per cycle, subtract relevant stop time, and apply the agreed reject rate. For multi-line or mixed-product production, calculate each configuration separately and avoid double-counting lanes or downtime. Chovyting Machinery can review your bag specifications and production targets to discuss a suitable configuration. A clear capacity calculation helps buyers compare equipment realistically and set production plans that reflect the output their factory can actually deliver.
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