Created on 08.31
Can One Filling Line Handle Different Bottle Sizes? Myth-Busting Production Flexibility
Modern packaging lines rarely produce only one product. A beverage factory may label 250 ml, 500 ml, and 1 L bottles during the same week. A cosmetics manufacturer may move between round lotion bottles, flat shampoo containers, and small serum bottles. Contract packaging companies face an even greater challenge because almost every customer brings different bottles, labels, and positioning requirements.
This is why flexibility has become an important purchasing criterion for modern bottle labeling machines.
Traditional equipment often requires operators to loosen bolts, reposition guide rails, recalibrate sensors, and process several test bottles before production can restart. Modern automatic labeling equipment takes a different approach. PLC recipe storage, servo-driven label feeding, digital position indicators, and tool-free adjustment mechanisms help manufacturers switch between product sizes with less manual work and fewer trial runs.
The real question is no longer whether one labeling machine can process different products. Manufacturers need to understand the speed, accuracy, and consistency with which each changeover can be completed.
Myth 1: Changing Product Sizes Always Causes Long Downtime
Why Traditional Changeovers Take So Long
Older labeling machines depend heavily on manual adjustment. When operators change from a short bottle to a taller one, they may need to reposition the labeling head, guide rails, bottle separator, top-hold belt, and product sensors individually.
Changes in labels add extra work. A longer label might mean different dispensing speed and different delay of the sensor, while a transparent label might require a different sensing technique.
Without any reference scale or saved setting, an operator will have to use his or her own experience and repeated testing, which can lead to the following:
- Long production interruptions
- Inconsistent settings between shifts
- Excessive test bottles and wasted labels
- Greater dependence on experienced operators
- Incorrect label placement after changeover
The machine may support multiple products on paper, but the adjustment process can still prevent efficient, flexible production.
How Modern Labeling Machines Reduce Changeover Time
Modern automatic labeling systems combine digital parameter storage with faster mechanical adjustments.
A PLC recipe may save the following:
- Label dispensing speed
- Conveyor speed
- Bottle separation frequency
- Label sensor delay
- Product sensor timing
- Label application position
- Pressing-belt speed
- Production counter settings
When the same SKU returns, the operator selects the corresponding recipe on the touchscreen instead of re-entering every parameter.
This approach is consistent with the broader use of enterprise recipe management in manufacturing, where validated production settings are centralized and reused to improve consistency.
Mechanical settings still need attention, but tool-free guide rails, locking handles, handwheels, and position scales help operators complete the process faster.
The goal is not necessarily a completely automatic changeover. In many applications, the practical goal is to remove unnecessary tools, reduce trial-and-error adjustment, and make each changeover repeatable.
Myth 2: Frequent Product Changes Reduce Labeling Accuracy
Why Errors Often Appear After Changeover
A labeling machine might operate correctly in the process of production but fail to place labels correctly in its very first moments after switching products. It is caused by several operations that have to be synchronized:
- The bottle has to be placed in the right spot.
- It should be detected by the product sensor at the right time.
- The label should be dispensed at the right pace.
- The conveyor and the label feeding system should be synchronized.
- The container has to be steady during labeling.
- The pressure should be applied uniformly.
A small difference in bottle diameter, height, label size, or the form of the container may influence the final position of the label.
With manual settings, each time an operator makes certain adjustments, he or she may do it differently. The guide rails might also be too tight or too loose.
Servo Control Improves Label Feeding
Servo-controlled labeling allows the labeler to have greater accuracy for the following factors in its operation:
- Length of feed
- Position of start
- Acceleration of feed
- Speed of labeling
- Position of stop
This factor becomes particularly important when the manufacturer uses various lengths of labels.
The recorded mechanical positions become particularly helpful in avoiding any mistakes in the setup process. The scales or digital counters can offer references for labeling heads, guide rails, sensors, and pressing belts.
Changeover Element | Traditional Setup | Flexible Labeling Equipment |
Product parameters | Entered manually | Stored in PLC recipes |
Guide rails | Adjusted with tools | Handwheel or tool-free adjustment |
Label position | Set through trial and error | Restored from recorded settings |
Sensor setup | Recalibrated each time | Saved or quickly adjusted |
Operator dependence | High | Lower |
Test bottle waste | Higher | Reduced |
Therefore, changeover accuracy would not be a question of the number of products but the ability of the machine to reproduce the validated positions.
Myth 3: One Labeling Machine Cannot Handle Different Bottle Shapes
Different Containers Need Different Control Methods
Round, square, oval, and flat bottles behave differently on a conveyor.
Round bottles are commonly processed with wrap-around labeling. Flat and square containers may require single-side or front-and-back labeling. Oval bottles often need additional stabilization because they can rotate during label application.
A basic machine configured for only one container type has limited flexibility. However, modular bottle labeling machines can include the following:
- Wrap-around belts
- Side pressing units
- Top-hold belts
- Adjustable guide rails
- Front-and-back labeling heads
- Bottle orientation systems
- Interchangeable positioning modules
More information about modular equipment design is available in Mejo’s guide to precision engineering for bottle labeling machines.
Flexibility does not mean one machine can process every bottle without adjustment. It means the necessary adjustments are built into the equipment design.
Product Families Simplify Production Planning
Manufacturers should group products according to:
- Bottle shape
- Bottle diameter
- Product height
- Label size
- Label material
- Required application position
Products within the same family usually require fewer mechanical adjustments.
For example, a factory can process all-round bottles before converting the machine for flat containers. Within the round-bottle group, it may move from smaller bottles to larger ones.
This reduces major conversions and makes the production schedule more efficient.
Smart Sensors Support Different Label Materials
Standard photoelectric sensors can usually detect paper and opaque labels. Transparent labels are more difficult because the sensor must distinguish the clear label from its backing material.
Ultrasonic or specialized fork sensors may therefore be required. For example, SICK UFS label sensors can detect labels with different colors, transparency levels, patterns, and surface finishes.
Transparent bottles may also require sensors developed for the detection of clear objects.
Manufacturers should provide actual bottles, labels, and backing materials for testing before the machine configuration is finalized.
Myth 4: Flexible Labeling Machines Are Difficult to Maintain
Even though a modular machine might have additional adjustment possibilities and other extra parts, it will not necessarily lead to a more difficult process of performing maintenance.
The modern labeling machines are often created on the basis of independent units. Heads, sensors, pressing units, bottle separators, and conveyor units can be checked and repaired individually.
Some detachable units make the following easier:
- Changing rolls of labels
- Cleaning dispensing rollers
- Removing adhesive deposits
- Examining the surface of sensors
- Checking the tightness of belts
- Replacing pressing pads
Using independent units could facilitate the process of finding malfunctions. Technicians can check the unit responsible for feeding, detecting, or stabilizing bottles individually.
Maintenance Must Not Be Sacrificed for Speed
Maintenance should consist of:
- Sensor and roller cleaning
- Conveyor chain inspection
- Drive belt testing
- Emergency stop testing
- Checking the condition of safety guards
- Collecting label backing waste
- Electrical connection inspection
Operators should never adjust moving components while the machine is running. The OSHA machine-guarding guidance explains the importance of protecting workers from rotating parts, nip points, and other equipment hazards.
Fast changeover is best accomplished through good machine design rather than neglecting the safety procedures.
Key Features That Enable Fast Product Switching
A flexible labeling machine should combine several technologies.
PLC Recipe Storage
Parameters that are proven can be stored using the name of the product or the SKU number.
Tool-Free Adjustment
The handwheel, slide rail, lock handle, and quick-release clamp eliminate the need for tools.
Servo-Driven Label Feeding
Servos control the feed of labels as the label length or speed of production varies.
Adjustable Labeling Heads
The labeling head must have the ability to adjust in the vertical, horizontal, and angled directions.
Modular Bottle Stabilization
Bottle-holding systems such as top-hold belts, side guides, and orientation units.
Business Benefits of Flexible Labeling
Faster changeovers offer several practical advantages:
- Less production downtime
- Lower bottle and label waste
- More efficient small-batch production
- Better equipment utilization
- Faster new-product introduction
- More consistent label placement
Saved recipes and documented settings also support better process control. This aligns with the principles of ISO 9001 quality management, including controlled processes and documented production information.
How to Evaluate Real Machine Flexibility
Before selecting a labeling machine, buyers should confirm:
- Minimum and maximum bottle diameter
- Supported product height
- Label width and length range
- Compatible container shapes
- Transparent-label capability
- Number of available PLC recipes
- Tool-free adjustment points
- Required change parts
- Expected changeover time
- Operator training and technical support
Manufacturers should test the smallest, largest, and most difficult products rather than only the easiest bottle.
The Mejo packaging technology blog provides additional information about labeling equipment and packaging-line configuration.
Final Takeaways
Flexible production does not simply mean that a machine can physically accommodate different bottles.
A practical, flexible labeling system should combine the following:
- PLC recipe storage
- Servo-driven label feeding
- Tool-free adjustment mechanisms
- Smart label and product sensors
- Modular bottle-positioning units
These features make product switching faster, reduce trial production, and improve setup consistency.
For a labeling system configured around your bottle sizes, label materials, production speeds, and changeover requirements, visit Mejo Pack or contact the engineering team.
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