
Streamline your end-of-line palletizing using a low-cost automatic bag palletizer. Adding a palletizer is one of the most cost-effective ways to reduce labor costs and improve efficiency. This article provides an overview of what a low-cost automatic bag palletizer is and highlights the features of the SentryStack palletizer.
What is a Low-Cost Automatic Bag Palletizer?
A low-cost automatic bag palletizer is designed to automate the manual and tedious process of stacking filled bags or boxes onto pallets. This type of palletizer is designed for businesses that need a palletizing solution but may not have the budget for a higher-speed robotic palletizer. Palletizers like the SentryStack offer reliable performance, medium-speed stacking rates, and user-friendly controls, making them a cost-effective solution for small to mid-sized operations.
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Overview of the SentryStack Palletizer
The SentryStack Palletizer combines affordability with automation. It can stack up to 7 bags per minute on undamaged pallets measuring up to 48” x 48” and at stacking heights of up to 6.5 feet. It has a gantry-style design and compact footprint, which makes it a great palletizing solution for facilities with limited floor space. Infeed conveyors (90 degree conveyor, bag pick conveyor, conveyor controls) are included in the price of the SentryStack Palletizer.
Watch a Video Demonstration of the SentryStack Palletizer
Core Features
- 3-Axis Cartesian Movement: Provides accurate bag placement with a servo-actuated gantry system.
- Mechanical Claw Gripper: Ensures secure handling using pneumatic power.
- Intuitive Touchscreen Interface: A 15” screen and HMI simplify operation and programming.
- Safety Measures: Includes light curtains and mechanical stoppers for operator protection.
- Durable Construction: Made with powder-coated carbon steel for long-term use.
- Recipe Storage: Capable of storing up to 10 pallet configurations.
Optional Enhancements
- Stainless steel construction (SS304/SS316) for specific industry needs.
- Automatic pallet and slip sheet dispensers.
- Bag flattening conveyors, settling conveyors, and custom grippers.
- ATEX-rated components for hazardous environments.

Frequently Asked Questions (FAQ)
Q: How much does the SentryStack palletizer cost?
A: As of June 2025, the turn-key SentryStack palletizer that includes infeed conveyors starts at around $132,000. A higher speed reconditioned robotic bag palletizer with conveyors, and a dual pallet stack configuration starts at around $181,000. A new high speed robotic bag palletizer with conveyors and automatic pallet and slip sheet dispensing system starts at around $325,000.
Q: What types of bags can the SentryStack handle?
A: The system is designed for various bag materials and sizes, supporting weights up to 154 lbs. (70 kg). It can also palletize boxes. For stacking drums, you will need an automatic drum palletizer.
Q: Is it difficult to change stacking configurations?
A: No. The HMI interface allows quick programming and storage of up to 10 configurations.
Q: Can this palletizer be integrated into an existing line?
A: Yes, its compact design and modular components make it easy to retrofit into current packaging operations. The entire system comes assembled in sections and contains detailed instructions for assembly, start-up, and continuous operation.

Q: What is a gantry-style palletizer, and how does it work?
A: A gantry-style palletizer uses a cartesian coordinate system (X, Y, Z axes) to move a gripper or suction head to place items on a pallet. It offers precise and repeatable movements, making it ideal for consistent stacking patterns.
Q: How does a gantry-style palletizer compare to a robotic arm palletizer?
A: Gantry palletizers are more affordable, easier to program, and better suited for high-weight or consistent-sized products. Robotic arms offer more flexibility for complex patterns or varied products but often come at a higher cost.
Q: What maintenance is required for a gantry palletizer?
A: Routine maintenance includes checking lubrication of the axis tracks, inspecting servo motors, calibrating sensors, and ensuring pneumatic components are functioning correctly.
Q: Can gantry palletizers handle variable product sizes?
A: Yes, many gantry-style systems can be programmed to handle different product dimensions and stacking configurations, although extreme variability may require custom grippers or programming adjustments.
Q: Are gantry palletizers scalable for future automation upgrades?
A: Absolutely. Many gantry systems, including the SentryStack, offer optional add-ons such as pallet dispensers, slip sheet applicators, and integration with conveyors for higher levels of automation.

Q: What are common troubleshooting issues with gantry palletizers?
A: Typical issues include sensor misalignment, air leaks in pneumatic systems, or programming errors in stacking logic. These are usually easy to diagnose with the built-in HMI diagnostics.
Q: How much space does a gantry-style palletizer require?
A: Gantry-style systems typically have a more compact and rectangular footprint compared to robotic arms, which need 360-degree clearance. The SentryStack, for example, is designed with space efficiency in mind.
Ready to Automate with a Low-Cost Automatic Bag Palletizer?
Ask a question or get a detailed price quote!
Call: (979) 217-1480