A toilet paper making machine can run continuously for many hours, but some components are exposed to regular wear, friction, cutting forces, paper dust, and repeated movement.
When a small wear part fails, the cost is not necessarily the part itself. The bigger cost may come from unexpected production downtime.
For example, a toilet paper converting line operating at 160–200 m/min can process a large amount of tissue paper during a single production shift. If a low-cost perforation blade or sensor stops the line, waiting several days for a replacement may cause more disruption than keeping the spare part in stock. Some current machine specifications list operating speeds in this range, while larger commercial systems can operate at substantially higher speeds.
For this reason, buyers should establish a spare-parts inventory before the machine enters regular production.
1. Why Should You Keep Spare Parts in Stock?
Not every component needs to be stored in large quantities.
A practical spare-parts strategy is to divide components into three groups:
| Spare Part Category | Example | Recommended Approach |
|---|---|---|
| High-Wear Parts | Blades, belts, bearings | Keep regular stock |
| Critical Parts | Sensors, valves, electrical modules | Keep emergency stock |
| Long-Life Parts | Motors, major rollers | Usually order when required |
The most important question is:
If this part fails, can the machine continue operating?
If the answer is no and the replacement lead time could be several days or weeks, keeping at least one spare may be worthwhile.
2. Perforation Blades
Perforation blades are among the most important wear components on a toilet paper making machine.
The perforation system creates the tear lines between individual sheets. Some machines use multiple rotating blades or spiral perforation systems. For example, published equipment specifications show configurations using four-blade and two-blade perforation systems with adjustable perforation pitches.
A worn blade can cause:
Uneven perforation
Poor tearing performance
Paper dust
Increased web breaks
Inconsistent sheet length
Example Inventory
Suppose a factory operates one toilet paper converting line and normally changes the perforation blades several times during the year.
A practical starting inventory could be:
2 complete replacement sets + 1 emergency set
The exact replacement frequency should be determined from actual operating hours, paper grade, production speed, and blade condition rather than a universal calendar interval.
3. Log Saw Blades and Cutting Components
If the production line includes a log saw for cutting long toilet paper logs into individual rolls, cutting components should receive high priority.
Typical spare parts may include:
Log saw blades
Cutting blades
Blade holders
Blade clamps
Sharpening components
Related fasteners
Cutting quality directly affects the appearance of the finished toilet paper roll.
A dull or damaged blade can produce:
Rough edges
Deformed rolls
Excessive paper dust
Increased cutting resistance
Reduced production stability
Example
Suppose a factory produces:
20 logs/minute
and each log is cut into multiple finished rolls.
Even a relatively short interruption can affect a large number of finished rolls.
Therefore, keeping at least one complete replacement blade set available can reduce the risk associated with unexpected blade damage.
The exact number depends on the saw design and manufacturer's recommended replacement procedure.
4. Bearings
Bearings are used in many moving sections of a toilet paper making machine.
They may be found in:
Rewinding shafts
Rollers
Embossing systems
Perforation systems
Conveyor systems
Drive assemblies
A failed bearing can stop a production section even if the bearing itself is inexpensive.
For example, a factory may keep:
| Bearing Type | Example Stock |
|---|---|
| Frequently Used Bearing | 4 pcs |
| Medium-Use Bearing | 2 pcs |
| Special Bearing | 1 pc |
This is only an inventory example.
The actual stock quantity should be based on the machine's parts list and the number of identical bearings installed.
When ordering bearings, do not rely only on appearance. Confirm:
Bearing model
Internal diameter
External diameter
Width
Sealing type
Speed rating
Manufacturer requirements
5. Drive Belts
Belts can gradually wear, stretch, crack, or become damaged.
Typical belt-related problems include:
Slipping
Abnormal noise
Reduced transmission efficiency
Inconsistent speed
Unexpected breakage
A machine may contain several different belt types.
For example:
| Belt Type | Example Stock |
|---|---|
| Main Drive Belt | 1–2 pcs |
| Rewinding Belt | 2 pcs |
| Conveyor Belt | 1 spare |
| Auxiliary Belt | 1 spare |
When purchasing replacement belts, the machine model and belt code should be checked carefully.
A belt that appears similar may have a different length, profile, or material.
6. Pneumatic Components
Many toilet paper machines use compressed air for functions such as roll loading, cutting, sealing, or other machine movements. One published machine specification, for example, lists a pneumatic system requiring approximately 5 kg/cm² minimum pressure, while another current machine specification gives a compressed-air requirement of 0.6–0.8 MPa. The actual requirement depends on the machine model.
Important pneumatic spare parts can include:
Solenoid valves
Pneumatic cylinders
Air hoses
Fittings
Seals
Pressure regulators
Filters
Flow-control valves
Example
For one production line, a factory might keep:
2 commonly used solenoid valves
1 spare cylinder for a critical mechanism
5–10 m of compatible air hose
10–20 spare fittings
1 pressure regulator
These quantities are examples for inventory planning rather than universal requirements.
Pneumatic parts are often relatively inexpensive compared with the production downtime caused by their failure.
7. Sensors
Sensors are small components, but they can have a large effect on machine operation.
Depending on the machine design, sensors may detect:
Paper position
Roll diameter
Core position
Machine position
Safety conditions
Product counting
Material presence
A failed sensor can cause:
Machine alarm → automatic stop → production interruption
The operator may initially spend considerable time troubleshooting a sensor fault.
Keeping commonly used sensors in stock can shorten troubleshooting time.
Example
If a machine uses eight different sensors and two of them are critical to production, the factory could keep:
1–2 spare units of each critical sensor
The spare should have the same electrical specifications and sensing characteristics as the original.
8. Embossing Roller Components
Embossing rollers are important for creating the desired tissue pattern and product appearance.
Complete embossing rollers are relatively large and expensive, so they are not necessarily the first parts a factory needs to keep in large quantities.
However, supporting components can be useful to stock.
These may include:
Bearings
Seals
Rubber components
Couplings
Fasteners
Adjustment components
Some tissue converting equipment suppliers list embossing rollers, rubber rollers, doctor blades, grinding stones, and other components as spare-part categories for paper converting machinery.
For a factory operating several different embossing patterns, the machine supplier should also provide the correct roller identification information.
9. Glue System Spare Parts
For machines using glue for tail sealing, ply bonding, or other functions, the adhesive system also requires maintenance.
Possible spare parts include:
Glue nozzles
Filters
Hoses
Seals
Valves
Pump components
Scrapers or glue knives
A blocked glue nozzle can cause:
Poor tail sealing
Open roll ends
Excessive glue
Uneven adhesive application
Production waste
Because these parts are generally small and relatively inexpensive, keeping several replacements available can be practical.
10. Electrical and Control System Components
Modern toilet paper making machines commonly use PLC and HMI control systems. Current machine documentation also identifies PLC control, HMI operation, sensors, and frequency or drive systems as parts of the control architecture.
Electrical spare parts may include:
Proximity sensors
Photoelectric sensors
Relays
Fuses
Contactors
Push buttons
Emergency-stop components
Power supplies
PLC modules
Communication cables
Not every factory needs to stock a complete PLC system.
However, if a particular PLC module is difficult to obtain locally, keeping one critical spare module can reduce potential downtime.
Before ordering, record:
PLC model
Module number
Input/output type
Voltage
Communication interface
Software/parameter backup requirements
11. Fuses, Relays, and Small Electrical Parts
Small electrical components are often overlooked because they are inexpensive.
However, they can stop the entire machine.
For example, a factory may keep:
| Component | Example Stock |
|---|---|
| Fuses | 10–20 pcs |
| Relays | 3–5 pcs |
| Contactors | 1–2 pcs |
| Push Buttons | 2–3 pcs |
| Indicator Lights | 2–3 pcs |
| Common Sensors | 2 pcs |
The exact quantity should be based on the machine's electrical drawings.
Small components are generally easier to store than large mechanical parts, so maintaining a small emergency inventory can be practical.
12. How Many Spare Parts Should You Keep?
There is no universal number because different machines have different configurations and production schedules.
A simple approach is to classify spare parts by risk.
Category A — Production-Critical
Keep at least 1–2 complete replacement units or sets.
Examples:
Critical sensors
Perforation blades
Log saw blades
Critical pneumatic valves
Important drive components
Category B — Regular Wear Parts
Keep enough for approximately 3–6 months of normal operation, based on actual consumption.
Examples:
Bearings
Belts
Seals
Small pneumatic fittings
Category C — Long-Life Components
Usually keep limited emergency stock or purchase when necessary.
Examples:
Large motors
Major rollers
Gearboxes
Complete rewinding assemblies
This classification can help prevent excessive inventory spending while maintaining production security.
13. Example: Spare Parts Plan for One Toilet Paper Machine
Consider a factory operating one converting line:
Production speed: 180 m/min
Working hours: 8 hours/day
Production days: 26 days/month
The theoretical monthly web-processing distance would be:
180 × 60 × 8 × 26 = 2,246,400 m/month
This is a simplified calculation and does not account for stops, speed changes, material changes, or production losses.
At this production intensity, consumable and wear components can become important operational factors.
A possible initial spare-parts package could look like:
| Spare Part | Initial Stock Example | Priority |
|---|---|---|
| Perforation Blade Set | 2–3 sets | High |
| Log Saw Blade Set | 1–2 sets | High |
| Bearings | 4–10 pcs depending on models | High |
| Drive Belts | 1–2 pcs per type | High |
| Pneumatic Valves | 1–2 pcs per critical type | High |
| Sensors | 1–2 pcs per critical model | High |
| Seals/O-rings | 10–20 pcs mixed | Medium |
| Fuses | 10–20 pcs | Medium |
| Relays | 3–5 pcs | Medium |
| Glue Nozzles | 2–5 pcs | Medium |
Again, this is a planning example, not a standard spare-parts list for every toilet paper making machine.
The supplier's recommended parts list and the actual machine configuration should always take priority.
14. Keep Spare Parts According to Lead Time
Lead time is another important factor.
Suppose:
Local sensor delivery: 1 day
Domestic bearing delivery: 2–3 days
Special pneumatic valve: 7 days
Customized embossing roller: 30–60 days
The inventory strategy should reflect these differences.
A part that can be delivered locally within 24 hours may not need six months of inventory.
A special component requiring several weeks to manufacture may justify keeping one spare.
A simple risk calculation can be:
Downtime Risk = Failure Probability × Downtime Impact × Replacement Lead Time
This does not need to be a complicated mathematical model. The purpose is to identify which components could cause the greatest operational disruption.
15. Keep the Spare Parts Properly Identified
Having spare parts in the factory does not help if operators cannot identify the correct component.
Each spare part should ideally have:
Part number
Machine model
Component name
Quantity
Supplier
Installation location
Purchase date
For example:
Part No.: PT-024
Name: Perforation Blade
Machine: TP-1800
Location: Perforation Unit
Stock: 3 sets
This makes maintenance and purchasing much easier.
16. Keep Technical Documents With the Spare Parts
The spare-parts inventory should be supported by technical documentation.
Useful documents include:
Spare-parts list
Exploded assembly drawings
Electrical diagrams
Pneumatic diagrams
PLC backup
HMI parameters
Maintenance manual
Machine parts catalog
When ordering replacement components, the machine model alone may not always be enough.
The part number, drawing position, dimensions, and electrical specifications can help the supplier identify the correct component.
17. What Should You Order With a New Toilet Paper Machine?
When purchasing a new machine, buyers should ask the supplier for a recommended initial spare-parts package.
A practical package can include:
Mechanical Parts
Bearings
Belts
Seals
Roll-related components
Fasteners
Cutting Parts
Perforation blades
Log saw blades
Blade holders
Sharpening components
Pneumatic Parts
Solenoid valves
Cylinder seals
Air fittings
Tubes
Electrical Parts
Sensors
Relays
Fuses
Contactors
Critical control modules
Glue System
Nozzles
Filters
Hoses
Seals
The exact package should be matched to the machine configuration.
Conclusion
A good spare-parts strategy for a toilet paper making machine is not about keeping every possible component in the warehouse.
It is about identifying the parts that can stop production, reduce product quality, or require long replacement lead times.
For most converting lines, particular attention should be given to:
Perforation blades
Log saw blades
Bearings
Drive belts
Sensors
Pneumatic valves
Seals
Electrical protection components
Glue-system components
Critical control-system parts
For example, a factory running a line at approximately 180 m/min for 8 hours per day and 26 days per month can theoretically process more than 2.24 million meters of tissue web per month. At this production intensity, keeping a small inventory of critical wear and emergency parts can help reduce the impact of unexpected component failures.
The best spare-parts list should ultimately come from the specific toilet paper making machine model, parts diagram, operating hours, production speed, local supplier availability, and expected replacement lead times.
When purchasing a new machine, buyers should request a complete spare-parts list with part numbers, recommended quantities, replacement intervals, and technical drawings. This makes future maintenance and parts purchasing significantly easier.