Semi-Automatic Carton Sealer (Standard)
Cost-effective carton sealing solution for small to medium production volumes with mixed carton sizes.
Product Overview
The SunAura semi-automatic carton sealer (standard) is a reliable and cost-effective packaging solution designed for small to medium production volumes, e-commerce fulfillment centers, and logistics warehouses. Cost-effective carton sealing solution for small to medium production volumes with mixed carton sizes.
Manufactured in our 48,000㎡ facility in Qingdao, China, every semi-automatic carton sealer (standard) undergoes 48-hour continuous run testing before shipment. The machine features a robust steel frame, durable drive system, and adjustable tape tension control for consistent seal quality. CE certified and backed by a 12-month warranty, this machine delivers factory-direct value without compromising on quality or reliability.
Key Features & Machine Capabilities
15 Cartons/Min Output
Efficient sealing speed for small to medium production volumes
Quick Size Changeover
Handwheel adjustment allows size change in under 30 seconds
Wide Carton Range
Accommodates carton width 150-500mm and height 120-400mm
Dual Side Belt Drive
Stable conveying with consistent tape application pressure
Low Maintenance Design
Accessible components, simple cleaning, minimal downtime
CE Certified Quality
Built to European safety standards, 48-hour run tested before shipment
The semi-automatic carton sealer is designed to perform top and bottom tape sealing on corrugated cartons after an operator manually folds the top flaps. The machine’s core function is to apply pressure-sensitive BOPP tape uniformly across both the top and bottom seams of a carton as it passes through the sealing station, creating a consistent, tamper-evident seal that protects contents during shipping and storage.
Key functional capabilities include: adjustable carton width and height via handwheel cranks, allowing the machine to accommodate carton sizes ranging from 150mm to 500mm in width and 120mm to 400mm in height without tools; dual side belt drive systems that grip the carton firmly on both sides and convey it through the machine at a consistent speed, ensuring even tape application regardless of carton weight or surface texture; top and bottom tape cartridges that hold standard 48mm, 60mm, or 72mm BOPP tape rolls, with adjustable tape tension to accommodate different tape brands and carton surface types including glossy, film-coated, or recycled corrugated; and a manual flap folding guide bar that helps operators fold top flaps quickly and uniformly before the carton enters the sealing station. The machine also features an adjustable conveyor height from 600mm to 800mm, allowing it to be integrated with existing conveyor lines or used as a standalone workstation.
Technical Specifications
| Sealing Speed | Up to 15 cartons/min (typical) |
| Carton Width | 150-500mm |
| Carton Height | 120-400mm |
| Tape Width | 48mm / 60mm / 72mm (adjustable) |
| Power Supply | 220V/50Hz or 110V/60Hz (customizable) |
| Power | 200W |
| Machine Dimensions | 1500 × 800 × 1450mm (L×W×H) |
| Machine Weight | 120kg (typical) |
| Conveyor Height | 600-800mm (adjustable) |
| Certification | CE, ISO 9001 |
* Specifications subject to change without notice. Custom configurations available.
How It Works & Operating Principle
Carton Infeed
Operator places the carton with bottom flaps folded onto the conveyor
Side Belt Conveying
Dual side belts grip and convey the carton through the sealing station
Top & Bottom Tape Sealing
Tape cartridges apply adhesive tape to top and bottom seams simultaneously
Sealed Carton Output
Fully sealed carton exits the machine, ready for labeling or shipping
The semi-automatic carton sealer operates on a straightforward mechanical principle driven by a single electric motor and a series of belt and roller transmissions. When the operator places a carton with the bottom flaps already folded onto the infeed conveyor, the dual side belts — driven by the motor through a reduction gearbox — grip the carton on both sides and pull it forward into the sealing station. The side belts are spring-loaded to maintain consistent pressure against the carton sides, compensating for minor variations in carton width and ensuring stable conveying even when cartons are slightly warped or out of square.
As the carton enters the top sealing station, a tape cartridge positioned above the carton applies the leading edge of the BOPP tape to the top surface of the carton. The tape is pressed against the carton by a foam rubber pressure roller that conforms to the carton surface, ensuring full adhesive contact even on slightly uneven corrugated surfaces. As the carton continues forward, the tape is unrolled from the cartridge and laid across the top seam. At the end of the sealing station, a stationary cutting blade — angled at approximately 30 degrees — severs the tape cleanly, and a second foam roller presses the trailing edge of the tape firmly against the carton. The bottom sealing station operates on the identical principle, with a tape cartridge and pressure roller positioned below the conveyor line. The entire process is purely mechanical with no PLC or sensor control, making the machine highly reliable and easy to maintain. The operator’s only manual function is folding the top flaps and guiding the carton onto the conveyor — all sealing, cutting, and pressing operations are performed automatically by the machine’s mechanical systems.
Applications & Industries
Why Choose This Machine
No middlemen, no trading company markup. Direct from our 48,000㎡ Qingdao factory.
18+ years manufacturing experience, thousands of units deployed worldwide.
Full parts and labor warranty, lifetime technical support via WhatsApp/WeChat.
Every machine undergoes 48-hour continuous run testing before shipment.
Related Products
Real Customer Case Studies
Semi-Automatic Carton Sealer — Compact Solution for Small Workshop
A small e-commerce workshop needed a reliable carton sealer for mixed carton sizes. The semi-automatic carton sealer was installed with quick-adjust handwheels, allowing the operator to change carton sizes in under 30 seconds while maintaining consistent tape sealing quality.
Watch Full Video →
Customer Brings Own Cartons for On-Site Machine Test — Film-Coated Carton Solution
A customer with film-coated cartons visited our factory for on-site testing. The semi-automatic carton sealer was adjusted for optimal tape adhesion on glossy surfaces, demonstrating reliable sealing across various carton suppliers.
Watch Full Video →Frequently Asked Questions
What is the lead time for this machine?
Standard machines typically ship within 15-20 business days from order confirmation. Custom configurations require 25-40 days. Every machine undergoes 48-hour continuous run testing before shipment, and we provide production progress photos throughout the manufacturing process.
Does this machine come with a warranty?
Yes, all SunAura machines come with a 12-month full warranty covering parts and labor. After the warranty period, we provide lifetime technical support via email, WhatsApp, and WeChat. Spare parts are available worldwide and typically ship within 48 hours via DHL/FedEx.
Can this machine be customized for my specific requirements?
Yes, most machines can be customized for carton size, voltage, machine color, sealing method, and additional features. We recommend sending your product/carton samples for testing before ordering. Contact our engineering team at Ethan@sunaura.com.cn or WhatsApp +86-13645429121 for custom configuration consultation.
What types of tape does this sealer use?
The sealer is compatible with standard BOPP packaging tape in widths of 48mm, 60mm, or 72mm. The tape tension is adjustable to accommodate different tape brands and carton surface types, including glossy or film-coated cartons.
Get a Quote for Semi-Automatic Carton Sealer (Standard)
Tell us your carton/product dimensions, daily output, and special requirements. Our engineering team will recommend the right configuration and send a detailed quote within 24 hours.
Why Choose the Standard SF-50 Over Other Variants
The SF-50 Standard is the baseline model in SunAura’s carton sealer lineup, designed for warehouses processing 200-800 cartons per day. Unlike the Heavy Duty variant (rated for 15kg+ cartons) or the High Speed model (25m/min), the Standard operates at 15m/min — the sweet spot for general-purpose packaging where operators manually load cartons at a sustainable pace.
Ideal Application Scenarios
- E-commerce fulfillment centers handling mixed-size orders (shoe boxes, electronics, books) where carton dimensions change frequently throughout the shift
- Small-to-medium food packaging lines packing dry goods, snacks, and bottled products in standard corrugated cartons (200-400mm width)
- Retail distribution warehouses repacking bulk shipments into retail-ready cartons for store delivery
Carton Specification Boundaries
| Parameter | Min | Max | Optimal Range |
|---|---|---|---|
| Carton Width | 150mm | 500mm | 200-350mm |
| Carton Height | 130mm | 400mm | 150-300mm |
| Carton Length | 120mm | 480mm | 200-400mm |
| Carton Weight | 0.5kg | 15kg | 2-10kg |
| Tape Width | 48mm | 60mm | 48mm (standard) |
Real-World Performance Data
In a 2026 field test at a Qingdao e-commerce warehouse processing 600 cartons/day (mixed sizes 200-400mm), the SF-50 Standard achieved:
- Average sealing cycle: 4.2 seconds per carton (manual load + auto seal)
- Tape consumption: 1.2 meters per carton (48mm BOPP tape)
- Size changeover time: 28 seconds (handwheel adjustment, no tools required)
- Continuous operation: 8 hours without overheating at 15m/min speed
- Misalignment rate: <0.3% (3 cartons out of 1,000 required re-sealing)
Selection Guide: When to Choose Standard vs. Other Variants
Choose Standard SF-50 if: Your daily output is 200-800 cartons, carton weights are under 15kg, and you need a reliable, cost-effective machine for mixed-size operations.
Choose Heavy Duty instead if: Your cartons regularly exceed 15kg or you process heavy industrial parts in thick-wall corrugated boxes.
Choose High Speed (25m/min) instead if: Your daily output exceeds 1,000 cartons and operators can load fast enough to utilize the higher speed.
Choose Side Belt instead if: Your cartons have smooth or printed surfaces where top-belt pressure might cause marking.
Choose Stainless Steel instead if: Your facility requires food-grade washdown-compatible equipment (IP65 rating).