May 22, 2025
How Do You Seal Cartons? A Guide to Carton Sealing Machines and Solutions
In today’s fast-paced warehousing and production environments, efficient and secure packaging is a must. Sealing cartons properly protects products, reduces downtime, and ensures your packaging line runs smoothly. Whether you’re scaling up operations or upgrading old equipment, understanding how carton sealing works — and choosing the right machine — is key.
At Contract Packaging Systems (CPS), we offer a market-leading range of semi-automatic and fully automatic carton sealers, including premium machines from SIAT and YGEN8, trusted by manufacturers across Australia and New Zealand.
What Is Carton Sealing?
Carton sealing is the process of closing cardboard boxes (typically corrugated cartons) using adhesive tape applied to the top and/or bottom flaps. It’s a critical final step in the packaging process, ensuring your products are protected during shipping or storage.
Done manually, this process can be slow, inconsistent, and labour-intensive. That’s where carton sealing machines come in — automating the process and improving speed, consistency, and safety.
How Do You Seal Cartons?
There are three common methods:
Manual Sealing
Using handheld tape dispensers – cost-effective for very low-volume packing but slow and prone to inconsistencies.
Semi-Automatic Carton Sealers
Machines that require an operator to feed and position the box, but automatically apply tape. Ideal for mid-volume lines or growing businesses.
Fully Automatic Carton Sealers
Machines that automatically feed, size, and seal boxes without operator involvement – best for high-speed, high-volume production lines.
How Does a Carton Sealer Work?
A carton sealer applies pressure-sensitive tape to the top and/or bottom flaps of a cardboard box. Most machines use top and bottom drive belts to move the carton through the taping heads, which apply and cut the tape cleanly.
Steps in the process include:
- Box loaded (manually or automatically)
- Machine adjusts to box size (manual or automatic)
- Tape applied and sealed
- Carton exits, ready for shipment
What Is a Semi-Automatic Random Carton Sealer?
A semi-automatic random carton sealer is designed to handle boxes of different sizes without requiring manual adjustments between each carton. The machine automatically detects the box dimensions and adjusts the height and width of the taping heads accordingly — saving time and reducing operator error.
This is especially useful in operations with mixed product lines or variable box sizes.
CPS Carton Sealer Range: Top Machines We Recommend
At CPS, we stock premium SIAT and YGEN8 carton sealers designed for durability, precision, and performance. Our product range includes:
SIAT NASTRO-SB M5 Semi-Automatic Carton Sealer
A robust, user-friendly machine ideal for medium-volume packaging lines. Offers reliable tape application with minimal maintenance.
SIAT SK20 Semi-Automatic Carton Sealer
Perfect for operations sealing standardised box sizes. Easy to set up and ideal for batch production.
SIAT NASTRO-SB – R8 Semi-Automatic Random Carton Sealer
Handles varied box sizes with automatic adjustment. Ideal for packing lines with frequently changing carton dimensions.
SIAT SR20 Semi-Automatic Random Carton Sealer
Compact, powerful, and ideal for small-to-medium operations handling random-size cartons. Built with high-quality Siemens and Festo components.
Why Choose CPS for Carton Sealers?
- Premium SIAT & YGEN8 machines
- Options for fixed-size or random-size cartons
- Top & bottom sealing capabilities
- Installation, training & ongoing national service
- 24/7 technical support and spare parts availability
Whether you need a compact sealer for small spaces or a high-performance machine for an automated line, CPS has the right carton sealing solution for your business.
Explore the Range
🔗 View our full product range here: Carton Sealers – CPS
Let’s Find the Right Carton Sealer for You
Ready to improve your packaging line? Speak to the experts at Contract Packaging Systems. We’ll help you select the right machine and provide full support from install to ongoing servicing.
📞 Call us on 03 9474 3800
📩 Email info@cpspackaging.com
