Tube filling is an automated packaging process used to place creams, gels, ointments, pastes, adhesives, sauces, and other flowable products into preformed tubes before closing the open end. A modern machine can load, orient, clean, dose, seal, code, trim, inspect, and discharge each tube through a controlled sequence.
The exact working principle depends on the tube material, product viscosity, required fill weight, sealing method, and production speed. Plastic and laminate tubes are commonly closed through a heat-based or ultrasonic process. Aluminum tubes are normally closed by folding and crimping the open end rather than melting it.
This guide explains every stage of the process, the main machine components, the differences between tube materials, and the factors that affect filling accuracy and seal quality.
Process at a Glance
| Process stage | What happens | Main control point |
|---|---|---|
| 1. Tube loading | Empty tubes enter holders or pucks | Correct tube supply and holder size |
| 2. Orientation | Registration marks are aligned | Sensor accuracy and tube rotation |
| 3. Cleaning | Air removes loose particles when required | Clean, dry air and extraction |
| 4. Product feeding | Product reaches the dosing system | Stable temperature and hopper level |
| 5. Dosing | A measured quantity enters each tube | Fill volume, speed and nozzle position |
| 6. Tail preparation | The open end is prepared for closure | Tube material and sealing method |
| 7. Sealing or folding | The tube is closed securely | Heat, pressure, time or fold settings |
| 8. Coding | Batch or date information is applied | Correct and readable code |
| 9. Trimming | Excess plastic or laminate is removed | Uniform cut and finished appearance |
| 10. Inspection and discharge | Defective tubes are rejected and accepted tubes exit | Fill, seal, code and appearance checks |
A rotary machine usually moves tubes through these stations on an indexing table. Linear and intermittent-motion systems use different transport layouts, but the operating sequence remains broadly similar.
What Is a Tube Filling and Sealing Machine?
A tube filling and sealing machine is packaging equipment designed for preformed plastic, laminate, or aluminum tubes. It measures the product into each tube and closes the open tail so that the contents remain contained during handling, storage, distribution, and normal consumer use.
Typical applications include:
Cosmetic creams, lotions, gels, scrubs and hair products
Pharmaceutical ointments, topical gels and dental products
Toothpaste and oral-care formulations
Food pastes, sauces, condiments and concentrates
Adhesives, sealants, lubricants and industrial compounds
Veterinary and household products
The machine can operate as a standalone unit or as part of an automatic filling machine line connected to cartoning, case-packing, inspection and coding equipment.
Main Machine Components
Understanding the machine’s components makes its working principle easier to follow.
Tube feeder and loading system
The feeder supplies empty tubes to the machine. Small or semi-automatic systems may require manual placement. Higher-output machines can use magazines, hoppers, pick-and-place systems, or robotic loading.
Tube holders or pucks
Each tube sits inside a holder that supports it during movement, filling, sealing, trimming, and discharge.
The holder must match the tube diameter closely enough to maintain alignment without damaging the package.
Orientation sensor
Printed tubes often have an eye mark or registration mark. A photoelectric or vision sensor detects this mark while the holder rotates the tube into the correct position.
Correct orientation keeps the artwork, coding, and final seal properly aligned.
Product hopper and feeding system
The product may enter from:
A heated hopper
A mixing tank
A pressure vessel
A transfer pump
An upstream processing system
Thick products may require controlled temperature, agitation, or positive-displacement feeding to maintain a stable flow.
Dosing system
The dosing system measures the product placed inside each tube.
Common options include:
Piston fillers
Servo-piston fillers
Rotary-lobe pumps
Gear pumps
Progressive-cavity pumps
Other product-specific systems
Filling nozzle
The nozzle directs the product into the tube. Its diameter, shape, cutoff design, diving movement, and position affect accuracy, air entrapment, stringing, and contamination around the seal area.
Sealing or folding station
This station closes the tube’s open end. The configuration depends on whether the tube is plastic, laminate, or aluminum.
Coding and trimming station
The machine may emboss or print:
Batch numbers
Production dates
Expiration dates
Product codes
Other traceability information
Plastic and laminate tube tails may also be trimmed into a straight or shaped finish.
Inspection and rejection system
Sensors or cameras can inspect tube presence, orientation, fill completion, seal formation, trimming, code readability, and other defined quality requirements.
A rejection device separates defective packages from accepted production.
How the Machine Works
Step 1: Empty Tube Loading
The process begins when empty tubes are placed into individual holders with their capped ends facing downward and their open tails facing upward.
On a semi-automatic machine, an operator may insert each tube manually. On a fully automatic system, a tube magazine or feeding mechanism separates and transfers tubes into the holders.
Reliable loading depends on:
Consistent tube dimensions
Correct holder size
Undamaged tube rims
Stable tube supply
Correct machine timing
Bent, oval, dented, or incorrectly sized tubes may not enter the holders properly and can cause stoppages later in the process.
Step 2: Tube Orientation
After loading, the machine rotates each tube until a sensor identifies the printed registration mark.
The machine then stops the tube at the programmed angle. This ensures that:
The front artwork faces the intended direction
The seal remains aligned with the printed design
Batch coding appears in the correct position
Tubes look consistent inside retail packaging
Unprinted tubes may not require this stage.
Transparent, reflective, metallic, or low-contrast tubes may require a specialized sensor or camera system instead of a standard eye-mark sensor.
Step 3: Internal Tube Cleaning
Some machines direct filtered air into each empty tube before filling. Vacuum extraction may then remove loosened particles.
This process can remove light debris created during tube production, cutting, transportation, or storage.
However, the cleaning system must not introduce:
Moisture
Oil
Unfiltered compressed air
Additional particles
Cross-contamination
The required cleaning method depends on the product, packaging material, facility, and quality system.
Step 4: Product Feeding and Conditioning
Before dosing begins, the formulation must reach the filling station under stable conditions.
Depending on the product, this may require:
A jacketed hopper
Gentle agitation
A heated product pathway
Controlled pressure
Vacuum deaeration
A sanitary transfer pump
Stable minimum and maximum hopper levels
Product temperature can significantly affect creams, gels, adhesives, ointments, and pastes. When a formulation becomes thicker or thinner during production, dosing pressure and fill consistency may change.
For difficult formulations, the setup principles in the viscous liquid filling machine guide can help determine suitable hopper, pump, nozzle, and temperature controls.
Step 5: Product Dosing and Filling
At the dosing station, the nozzle enters or approaches the open tube and dispenses a measured quantity of product.
This stage is the core of tube filling. The machine coordinates product measurement, nozzle movement, tube position, and cutoff timing.
A typical sequence is:
The tube arrives beneath the nozzle.
A tube-presence sensor confirms its position.
The nozzle moves to the programmed filling height.
The dosing system dispenses the target quantity.
The nozzle may rise as the product level increases.
Product flow slows near the end of the dose.
The shut-off system stops the flow.
The nozzle retracts before the tube advances.
Bottom-up filling can help reduce:
Air pockets
Splashing
Product folding
Contact with the upper tube wall
Contamination near the sealing area
A positive shut-off or suck-back nozzle can help prevent dripping and product strings.
The dosing system must match the formulation. A smooth lotion, abrasive paste, adhesive, toothpaste, and sauce containing particles may require different pumps, valves, and product-contact pathways.
Step 6: Keeping the Seal Area Clean
The tube’s open tail must remain free from product contamination before closure.
Product around the internal sealing surface can cause:
Weak seals
Channels through the seal
Product leakage
Poor appearance
Inconsistent closure
Increased rejection rates
The machine reduces this risk through:
Correct fill height
Controlled nozzle withdrawal
Accurate cutoff timing
Anti-drip nozzle design
Sufficient headspace above the product
Persistent dripping should be investigated through the tube filling and sealing troubleshooting guide instead of being hidden by unnecessarily reducing the fill quantity.
Step 7: Tube Sealing or Folding
The closure method changes according to the tube material.
Plastic tube sealing
Plastic tubes are commonly closed using hot-air or ultrasonic technology.
With hot-air sealing, heated air softens the inner surfaces of the open tail. Cooling and pressing jaws then compress the softened material to form the seal.
The machine controls:
Air temperature
Heating time
Jaw pressure
Cooling time
Tube position
Production speed
With ultrasonic sealing, high-frequency mechanical vibration generates localized heat at the sealing interface while pressure holds the tube material together.
The appropriate method depends on the material, formulation, required output, and machine configuration.
Laminate tube sealing
Laminate tubes may use:
Hot-air sealing
High-frequency sealing
Ultrasonic sealing
Another material-compatible closure system
The correct method depends on the laminate structure, including whether the tube contains an aluminum barrier layer.
Seal settings must be developed using the actual tube specification. Two laminate tubes that look similar may require different heating, pressure, and cooling parameters.
Aluminum tube folding
Collapsible aluminum tubes are normally closed mechanically.
Folding tools flatten and fold the open tail one or more times. The machine then crimps the fold securely.
Common configurations include:
Single fold
Double fold
Triple fold
Saddle fold
Smooth crimp
Serrated or wave crimp
The correct folding style depends on the tube, product, appearance, coding requirements, and closure specifications.
Aluminum tubes should not be treated as if they use the same melting process as plastic tubes.
Step 8: Batch Coding or Embossing
After or during closure, the machine may apply:
Batch number
Lot number
Manufacturing date
Expiration date
Product code
Traceability information
Coding may be embossed into the tail or printed using:
Inkjet equipment
Laser equipment
Thermal-transfer equipment
Another integrated coding system
The code must remain readable and correctly positioned.
Where required, a vision system can inspect the presence, content, contrast, and position of the code.
Step 9: Tail Trimming and Shaping
Plastic and laminate tubes may have excess material above the completed seal.
A trimming station removes this material and creates a consistent finished edge.
The cutting tool may produce:
A straight edge
Rounded corners
A curved contour
A custom promotional shape
A hanging hole
Another supported finish
Trimming is not only cosmetic. Poor cutting can produce:
Sharp edges
Inconsistent tube lengths
Damaged seals
Loose fragments
Uneven presentation
Aluminum tubes are folded and crimped rather than trimmed in the same way as heat-sealed plastic tubes.
Step 10: Inspection, Rejection and Discharge
At the final stations, the machine checks the defined process conditions and removes defective output.
Depending on the equipment, inspection may include:
Tube presence
Correct orientation
Fill completion
Tube-tail cleanliness
Seal formation
Trim quality
Code presence
Tube height
Weight verification
Leakage testing
Vision inspection
Accepted tubes move to a discharge conveyor, collection area, cartoning machine, or another downstream system.
Rejected tubes should enter a separate controlled container so they cannot be mixed with accepted production.
Working Principle by Machine Type
Semi-Automatic Machines
A semi-automatic machine may require an operator to:
Load tubes
Initiate the filling cycle
Transfer tubes to a sealing station
Remove completed packages
This design can be suitable for:
Product trials
Low-volume manufacturing
Small businesses
Frequent product changeovers
Facilities with limited space
Output depends significantly on operator speed and consistency.
Automatic Rotary Machines
A rotary system uses an indexing table with several tube holders. Each movement advances the tubes to the next processing station.
Rotary machines offer a compact layout and can combine:
Loading
Orientation
Cleaning
Filling
Sealing
Coding
Trimming
Inspection
Discharge
Automatic Linear Machines
A linear machine moves tubes through a straight transport path.
This layout may provide greater flexibility for:
Specialized process stations
Larger machine modules
Inspection systems
Controlled production zones
Integration with downstream equipment
The correct layout depends on output, product behavior, tube format, available space, and line requirements.
Factors That Affect Filling Accuracy
Accurate tube filling requires more than entering a target volume on the touchscreen.
Important variables include:
Product density
Product viscosity
Temperature
Air trapped inside the formulation
Hopper level
Pump or piston condition
Valve condition
Nozzle cutoff
Tube dimensions
Machine speed
Calibration method
Filling-head setup
For weight-controlled products, operators should account for empty-tube tare variation and measure the net product quantity rather than judging accuracy only by visible product level.
The machine should be tested with the actual formulation and intended tube at normal production speed.
Factors That Affect Seal Quality
A strong seal depends on the interaction between the packaging material, machine settings, and seal-area cleanliness.
Important variables include:
Tube material
Tube-wall structure
Tail thickness
Heat or energy input
Exposure time
Jaw pressure
Cooling time
Fold geometry
Tool alignment
Product contamination
Tube position
Production speed
A seal that looks acceptable may still contain weak areas or hidden channels.
The quality procedure should define suitable visual, dimensional, leak, burst, peel, or other package tests based on the product and tube specification.
Common Operating Problems
| Problem | Likely cause | Corrective direction |
|---|---|---|
| Underfilled tubes | Air in the product path, restricted flow, wrong dose or worn seal | Prime, inspect and recalibrate |
| Overfilled tubes | Incorrect target, delayed cutoff or unstable pressure | Verify recipe and cutoff timing |
| Product on tube tail | Nozzle dripping, excessive fill height or poor withdrawal | Adjust nozzle and anti-drip settings |
| Weak plastic seal | Insufficient heat, low pressure, contamination or inadequate cooling | Confirm material-specific settings |
| Burned or distorted tail | Excessive heat or exposure time | Reduce heat input and verify cooling |
| Uneven aluminum fold | Misaligned tools or incorrect fold setup | Realign and inspect folding components |
| Misaligned artwork | Eye-mark sensor or tube-rotation problem | Clean, reposition and recalibrate sensor |
| Poor trimming | Dull blade or incorrect tool position | Inspect, replace or realign cutter |
| Tube jams | Damaged tubes, wrong holders or poor timing | Check tube quality and format parts |
| Unreadable code | Incorrect settings or contaminated coding equipment | Clean, adjust and verify code |
For a broader fault library, review common tube filling and sealing machine problems.
Cleaning and Maintenance
Regular cleaning helps protect product quality and keeps the dosing and sealing systems stable.
Before production
Confirm the correct recipe and format parts.
Inspect machine guards and safety devices.
Check the hopper, pump, hose, nozzle and seals.
Verify tube holders and sensors.
Run test tubes.
Confirm fill quantity and seal quality.
During production
Monitor fill weight.
Inspect tails for contamination.
Check seal and trim consistency.
Monitor product temperature and hopper level.
Record alarms, rejects and stoppages.
After production
Remove the remaining product safely.
Clean approved product-contact components.
Inspect the nozzle and cutoff valve.
Clean tube holders and sensors.
Check sealing jaws, folding tools and cutters.
Record faults and replaced components.
The detailed tube filling machine cleaning and maintenance guide explains the main cleaning sequence and component checks.
Only trained and authorized personnel should work inside guarded, electrical, pneumatic, heated, ultrasonic, or moving machine areas.
How to Choose the Right Machine
Before requesting a quotation, prepare the following information:
Product name
Product application
Product viscosity
Filling temperature
Target fill weight or volume
Tube material
Tube diameter
Tube length
Tube-tail specification
Required tubes per minute
Number of tube formats
Required sealing or folding method
Coding requirements
Cleaning requirements
Inspection requirements
Facility utilities
Destination country
Documentation requirements
Upstream equipment
Downstream equipment
The tube sealing and filling machine product page provides available configurations for cosmetic, pharmaceutical, food, and industrial applications.
A representative product-and-tube test should be completed before final machine approval.
Frequently Asked Questions
What is the tube filling process?
The process loads an empty tube, aligns it, optionally cleans it, dispenses a measured product quantity, closes the open tail, applies coding, trims the package where required, inspects it, and discharges the completed tube.
How does a tube filling machine work?
It moves preformed tubes through timed stations for orientation, dosing, sealing or folding, coding, trimming, inspection, and discharge. Sensors and control systems coordinate each stage.
What products can a tube filler handle?
Depending on its dosing system, it may handle creams, gels, lotions, ointments, toothpaste, food pastes, adhesives, lubricants, sealants, and other flowable or viscous formulations.
How are plastic tubes sealed?
Plastic tubes are commonly sealed using hot-air or ultrasonic technology. The material is softened or activated, pressed together, and cooled to create a closed tail.
How are aluminum tubes sealed?
Aluminum tubes are normally closed mechanically through flattening, folding, and crimping. They do not use the same heat-melting process as standard plastic tubes.
What causes a tube seal to leak?
Common causes include product contamination, incorrect heat or pressure, insufficient cooling, tool misalignment, damaged tube material, poor fold geometry, or worn sealing components.
How accurate is tube filling equipment?
Accuracy depends on the product, dose, dosing system, machine condition, temperature, speed, and calibration. Buyers should request testing with the actual formulation and tube.
Can one machine handle different tube sizes?
Many machines support several diameters and lengths through change parts and recipe adjustments. Confirm the supported range, tooling cost, and changeover time before ordering.
Is a separate capping machine required?
Most collapsible tubes arrive with caps already installed. The filler closes the opposite open tail. Specialized rigid tubes or alternative package designs may require another closing system.
Get a Machine Recommendation
An effective tube filling system must match the product, tube material, target output, sealing method, cleaning process, facility utilities, and quality requirements.
Foshan Popper Machinery supplies semi-automatic and automatic tube filling and sealing equipment for cosmetics, pharmaceuticals, food pastes, adhesives, and industrial products.
Contact the technical team with your product details, tube drawings or samples, target fill quantity, required production speed, destination country, and preferred sealing method to receive a suitable machine recommendation.
