Fully Automatic Random Carton Sealing for High-Performance Packaging Lines

Designed for automated packaging lines, the SM44-HS can process cartons in random formats without requiring an operator to manually adjust the machine between different box sizes. An automatic four-flap folding system closes the top major and minor flaps before the carton is sealed.

The SM44-HS combines automatic carton adjustment, four-flap folding, carton sensing and centring, side-drive belts and automatic top-and-bottom taping to provide a highly automated carton sealing solution.

The range is particularly suited to businesses handling multiple carton sizes, where frequent manual changeovers could otherwise reduce productivity.

SIAT also offers the SM446-HS, a larger-format version designed for larger cartons and providing a maximum carton size of up to 800 × 650 × 650 mm, compared with up to 600 × 500 × 500 mm for the standard SM44-HS configuration.

Machine Overview

Fully automatic random case sealer
Automatic carton size adjustment
Automatic four-flap folding
Simultaneous top and bottom carton sealing
Dual 75 mm side-drive belts
Automatic carton height detection
Integrated centring, sensing and indexing
Up to 10 cartons per minute on the SM44-HS
Up to 8 cartons per minute on the larger SM446-HS
Standard 50 mm taping units
Optional 75 mm taping units
Designed for RSC, HSC and FEFCO 0201 cartons
Suitable for random, fixed-format and bypass applications
PLC-controlled communication for packaging-line integration
CE-compliant safety protection

Key Features of the SIAT SM44-HS

Fully Automatic Random Carton Adjustment

One of the key advantages of the SM44-HS is its ability to automatically adjust to different carton dimensions.

This makes the machine particularly valuable for production environments where cartons of different sizes are processed on the same packaging line. The automatic adjustment eliminates the need for continuous manual changeovers between random carton formats.

Automatic Four-Flap Folding

The integrated four-flap folding system automatically closes the carton’s top major and minor flaps.

This removes the need for an operator to manually fold the carton flaps before sealing, helping create a continuous automated packaging process.

Automatic Top and Bottom Sealing

The SM44-HS applies adhesive tape to the top and bottom of the carton, creating a secure closure ready for conveying, storage and transport.

The standard configuration uses two K11 taping units for 50 mm tape, with optional K12 units available for 75 mm tape.

Dual Side-Drive Belts

The machine uses two 75 mm side-drive belts to transport cartons through the sealing process.

The belts operate at up to 30 metres per minute, supporting efficient carton movement through the machine.

Automatic Carton Height Detection

An electro-pneumatic detection system identifies carton height and allows the upper sealing system to automatically position itself according to the carton being processed.

This is an important part of the machine’s random-format capability.

Centring and Indexing System

The SM44-HS incorporates an indexing system with carton holding functionality, together with centring and sensing capabilities.

These systems help position cartons correctly before they enter the sealing process and support consistent automatic operation.

Side Pressure Rollers

Side pressure rollers help control the carton flaps as they are closed, supporting reliable flap positioning before the tape is applied.

Automatic Tape Application

The machine automatically applies two strips of pressure-sensitive adhesive tape along the centre line of the upper and lower carton surfaces.

SIAT’s K-Series taping units can process tape materials including PVC, PP/PET and paper, subject to the selected taping-unit configuration.

Easy Integration into Packaging Lines

The SM44-HS is designed for integration into automated packaging systems.

The machine features sensing, centring, indexing and PLC functionality to support communication and signal exchange with upstream and downstream equipment.

Safety Protection

The machine incorporates safety fencing and protection systems, including safety interlocks designed to stop or disconnect relevant machine functions when access protection is opened.

This supports safer operation within an automated production environment.

Why Choose the SIAT SM44-HS?

Automate Random Carton Sealing

The biggest advantage of the SM44-HS is its ability to process random carton sizes automatically.

For manufacturers handling multiple SKUs or variable carton dimensions, this can remove the need for manual machine adjustments between production runs.

Reduce Manual Intervention

The automatic four-flap folding system means operators do not need to manually close the top carton flaps before sealing.

This can free operators to perform other tasks within the production process.

Improve End-of-Line Productivity

With a capacity of up to 10 cartons per minute for the SM44-HS, the machine can provide a substantial increase in carton-sealing productivity compared with manual sealing processes.

Maintain Consistent Sealing

Automated flap closing and tape application help provide a repeatable sealing process across different carton formats.

Reduce Changeover Requirements

Random adjustment means cartons of different dimensions can be processed without requiring the operator to manually reset the machine for every box size.

Integrate with Automated Packaging Equipment

The SM44-HS is designed to work as part of a wider packaging line and can be positioned downstream from equipment such as case packers and conveyors.

It can also feed into downstream equipment such as pallet wrappers or palletising systems.

Choose the Larger SM446-HS for Larger Cartons

For businesses handling larger carton formats, the SM446-HS extends the capability of the range, accommodating cartons up to approximately 800 × 650 × 650 mm.

Benefits of the SIAT SM44-HS

The SM44-HS can help manufacturers:

Automate carton sealing
Process random carton sizes
Eliminate frequent manual machine adjustments
Automatically fold carton flaps
Reduce repetitive operator intervention
Seal carton tops and bottoms consistently
Increase end-of-line productivity
Improve carton presentation
Reduce manual handling
Support multiple SKUs and carton formats
Integrate carton sealing into an automated packaging line
Improve packaging-line efficiency
Support future packaging automation

SIAT SM44-HS vs SM446-HS

The SM44-HS range includes configurations designed for different carton sizes.

SIAT SM44-HS

The standard SM44-HS is designed for cartons up to approximately:

600 mm L × 500 mm W × 500 mm H

A low-box configuration is also available, allowing the machine to process cartons with lower minimum heights.

SIAT SM446-HS

The larger SM446-HS is designed for bigger cartons, with a maximum carton size of approximately:

800 mm L × 650 mm W × 650 mm H

Its maximum production rate is approximately 8 cartons per minute, compared with up to 10 cartons per minute for the SM44-HS.

The appropriate model depends on carton dimensions, production requirements and the overall packaging-line configuration.

Applications for the SIAT SM44-HS

The SM44-HS is suited to industries where carton sizes can vary and automated sealing is required.

Potential applications include:

E-commerce
Logistics and distribution
Food and beverage
Wine and spirits
Pharmaceutical manufacturing
Personal care
Household and consumer products
General manufacturing

The random-format capability makes the machine particularly useful where different products and carton sizes are processed through the same packaging line.

Talk to Packserv About the SIAT SM44-HS

If you are looking to automate carton sealing and regularly process cartons of different sizes, the SIAT SM44-HS provides a flexible solution that combines random carton adjustment, automatic flap folding and top-and-bottom sealing.

Contact Packserv to discuss your carton dimensions, production requirements and packaging-line configuration.

Specifications	SIAT SM44-HS	SIAT SM446-HS
Machine Type	Fully automatic random case sealer	Fully automatic random case sealer
Carton Adjustment	Automatic	Automatic
Flap Folding	Automatic 4-flap folder	Automatic 4-flap folder
Carton Sealing	Top and bottom	Top and bottom
Carton Type	RSC, HSC, FEFCO 0201	RSC, HSC, FEFCO 0201
Flute Types	B, C, E	B, C, E
Minimum Carton L × W × H	200 × 160 × 140 mm	300 × 160 × 140 mm
Maximum Carton L × W × H	600 × 500 × 500 mm	800 × 650 × 650 mm
Low-Box Option	Yes	Configuration dependent
Minimum Carton Weight	1.5 kg	1.5 kg
Maximum Carton Weight	32 kg	32 kg
Production Capacity	Up to 10 boxes/min	Up to 8 boxes/min
Belt Speed	30 m/min	30 m/min
Side-Drive Belts	2 × 75 mm	2 × 75 mm
Standard Taping Units	K11 / 50 mm	K11 / 50 mm
Optional Taping Units	K12 / 75 mm	K12 / 75 mm
Tape Materials	PVC / OPP / PET / Paper	PVC / OPP / PET / Paper
Tape Reel Maximum Diameter	410 mm	410 mm
Inner Tape Core	76 mm	76 mm
Pneumatic Supply	5.5–7 bar	5.5–7 bar
Machine Dimensions L × W × H	Approx. 3,355 × 1,251 × 1,830–2,105 mm	Approx. 4,187 × 1,215 × 2,240–2,440 mm
Machine Weight	Approx. 750 kg	Approx. 1,200 kg
*Specifications are based on SIAT’s current January 2025 datasheet. Exact machine configuration, carton dimensions, options and production performance should be confirmed when specifying equipment for an individual application.

Sealer Type	Case Sealers
Make	SIAT
Automatic Function	Automatic
Mounting	Stand

SIAT Automatic Case Sealing from Packserv

The SIAT SM44 HS provides a higher level of automation than semi-automatic carton sealing machines, making it suitable for manufacturers looking to integrate random carton sealing into an automated production line.

Packserv can assist with evaluating the machine against your carton dimensions, production volumes, carton variation and existing packaging equipment.

Building a Complete Automated Packaging Line

The SM44 HS can be incorporated into a broader end-of-line packaging system.

A typical automated process could include filling, capping, labelling, conveying, case erecting, and pallet wrapping.

The SM44 HS can therefore form an important link between automated case packing and downstream pallet handling.

Why Random Carton Sealing Matters

For manufacturers processing multiple carton sizes, conventional fixed-format case sealers can require manual adjustments between production runs.

A random case sealer such as the SM44-HS automatically adjusts to changing carton dimensions, helping reduce changeover time and operator intervention.

This can be particularly valuable for:

Multi-SKU production
E-commerce fulfilment
Third-party logistics
Contract packaging
Distribution centres
Mixed-product manufacturing
High-volume packaging operations

Choosing Between the SM44-HS and SM446-HS

The main consideration is carton size.

Choose the SM44-HS where cartons fall within the standard machine’s size range up to approximately 600 × 500 × 500 mm.

Consider the SM446-HS where larger cartons up to approximately 800 × 650 × 650 mm need to be processed.

Packserv can help determine the most appropriate configuration based on your complete carton range rather than selecting a machine based only on your average carton size.

Explore common packaging machinery terms, equipment types and technical terminology.

Packaging Machinery Glossary

Frequently Asked Questions

What is the SIAT SM44 HS Case Sealer?

The SIAT SM44 HS is a fully automatic random case sealer designed to automatically adjust to different carton sizes, fold the top carton flaps and seal the carton with pressure-sensitive adhesive tape.

Is the SIAT SM44 HS fully automatic?

Yes. The SM44 HS is a fully automatic case sealer. It automatically detects carton dimensions, adjusts to the carton, closes the four top flaps and applies tape without requiring an operator to manually adjust the machine between random carton sizes.

What does "random case sealer" mean?

A random case sealer is designed to process cartons of different dimensions without requiring manual machine adjustment between each carton. The SM44 HS automatically adjusts its sealing system to accommodate different carton sizes as they enter the machine.

Does the SM44 HS fold carton flaps automatically?

Yes. The machine incorporates an automatic four-flap folding device that closes the major and minor top flaps before sealing.

Does the SM44 HS seal the top and bottom of cartons?

Yes. The SM44 HS automatically applies adhesive tape to both the top and bottom of the carton.

How fast can the SIAT SM44 HS seal cartons?

The current SIAT datasheet specifies productivity of up to 10 cartons per minute for the SM44 HS, based on the shortest processable carton length. The larger SM446 HS is rated at up to 8 cartons per minute. Actual throughput depends on carton dimensions and the overall packaging-line configuration.

What carton sizes can the SM44 HS handle?

The standard SM44 HS configuration handles cartons from approximately 200 × 160 × 140 mm up to 600 × 500 × 500 mm (L × W × H). A low-box configuration can accommodate a minimum height of approximately 90 mm, depending on the selected leg configuration.

What carton sizes can the SM446 HS handle?

The larger SM446 HS can process cartons from approximately 300 × 160 × 140 mm up to 800 × 650 × 650 mm.

What type of cartons can the SM44 HS seal?

The machine is designed for RSC, HSC and FEFCO 0201 carton formats. SIAT specifies compatibility with B, C and E flute types.

What is the maximum carton weight?

SIAT's current datasheet specifies a carton weight range of approximately 1.5–32 kg for the SM44/SM446 HS range.

What type of tape does the SM44 HS use?

The machine can process pressure-sensitive adhesive tapes including PVC, OPP, PET and paper, depending on the taping-unit configuration. Standard machines use 50 mm K-Series taping units, with 75 mm taping units available as an option.

Can the SM44 HS be integrated into an existing packaging line?

Yes. The SM44 HS is designed for automated line integration and incorporates centring, cadencing, sensing and PLC signal exchange to support connection with upstream and downstream equipment.

Can the SM44 HS run fixed-size cartons as well as random cartons?

Yes. The machinery range can operate in fully random format, fixed format and bypass mode, providing flexibility for different production requirements.

What is the difference between the SM44 HS and the Nastro-SB R?

The Nastro-SB R is a semi-automatic random case sealer, while the SM44 HS is a fully automatic random case sealer. The SM44 HS also automatically folds the four top carton flaps, making it suitable for a higher level of packaging-line automation.

What is the difference between the SM44 HS and SM44 HD?

Both are automatic random case sealers. The SM44 HS is the higher-performance version, using brushless motor control for the top taping unit and a carton-height detection system.

Is the SM44 HS suitable for e-commerce?

Yes. The random-format capability and automatic adjustment make the SM44 HS well suited to applications such as e-commerce and logistics, where carton sizes can vary significantly.

Can Packserv help integrate the SM44 HS?

Yes. Packserv can assess carton dimensions, production volumes and existing equipment to determine how the SIAT SM44 HS could be incorporated into an automated packaging line.

Automatic Case Sealers with Random Adjustment – SM44-HS