Date: April 8, 2026
By: Zhengzhou Yishang Machinery Equipment Co., Ltd.

In the fast-paced world of construction material production, efficiency at the end of the packaging line is just as critical as the mixing quality. For manufacturers of dry mortar, tile adhesive, and wall putty, the final step—stacking heavy 25kg bags onto pallets—has traditionally been a bottleneck. It is labor-intensive, physically demanding, and prone to errors that lead to pallet instability.

At Zhengzhou Yishang Machinery Equipment Co., Ltd. , we have engineered a solution to change that. Our Fully Automatic Dry Mortar Bags Palletizing System.mp4  is transforming how Chinese and global manufacturers handle their 25kg finished product bags .

But how exactly does this system work, and why is it a game-changer for your production line? Let us take you through the seamless journey of the 25kg Bag Stacking Machine.

Step 1: The Automated Bag Arrival and Alignment

The process begins the moment your dry mortar exits the filling machine. Instead of falling onto a conveyor chaotically, the 25kg bags are transferred via a high-speed belt conveyor to our centering and flattening device .

What happens here: Sensors detect the position of each bag. Mechanical arms gently push the bag from the sides to ensure it is perfectly centered. Simultaneously, a roller flattens the product inside the bag, removing air pockets and creating a rigid, rectangular shape. This is crucial for dimensional stability; a flat bag is a stackable bag.

Step 2: The High-Speed Layer Formation (The "Twin-Belt" Principle)

Once aligned, the bag moves toward the "layer preparation area." This is the technical heart of the dry mortar palletizing system .

Traditional palletizers use mechanical "pushers" or "sweepers" that slam the bag into place. This can deform the bag and damage the seal, causing leaks in your expensive product.

Our approach: We utilize an advanced turning device similar to high-end European designs but optimized for the abrasive nature of dry mortar. The bag is carried by two parallel belt conveyors moving at differential speeds. This causes the bag to rotate gently into the required position (e.g., a 90-degree turn for an interlocking pattern) without any jerky movements .

Why it matters: This gentle handling ensures that even paper or woven polypropylene bags filled with 25kg of sharp sand or cement retain their structural integrity and aesthetic appeal.

Step 3: The "Layer by Layer" Palletizing Logic

Unlike robotic arms that stack one bag at a time (which can be slow), our high-capacity layer palletizer collects a full layer of bags before placing them onto the pallet .

The Process:

1. Accumulation: Bags are arranged on a "dead plate" or apron to form a specific pattern (e.g., 4 bags in one direction, 3 in another).

2. Lifting: An overhead magnetic or vacuum head grips the entire layer simultaneously.

3. Placement: The head moves over to the pallet and precisely lowers the layer.

This method ensures geometric precision. For a 25kg dry mortar stack, maintaining a column-straight load is vital to prevent pallets from toppling during warehouse storage or transit.

Step 4: Smart Pattern Programming (HMI Control)

Every dry mortar plant has different requirements. Some need 1,200 bags per hour for bulk cement, while others require slower, more varied stacking for specialty tile grouts .

Our system features a User-Friendly PLC Control System with a Touchscreen HMI. The operator can select from pre-programmed patterns (interlocking, column, or brick-lay) or create a new pattern on the fly .

Key Advantage: If you change your bag size from 25kg to 20kg or switch from a valve bag to an open-mouth bag, the operator simply enters the new dimensions. The servo-driven system auto-adjusts the turning device and stop gates without requiring mechanical tooling changes.

Step 5: Pallet Dispensing and Final Discharge

While the stacking happens, an automatic pallet dispenser feeds empty wooden or plastic pallets into the palletizing zone. Once the system reaches the programmed stack height (e.g., 1,600mm or 1,800mm), the conveyor automatically moves the full pallet out to the stretch-wrapping station .

This continuous flow means your production line never stops to wait for a pallet change.

Why Choose Zhengzhou Yishang's 25kg Bag Palletizer?

In a market where downtime is expensive, our machinery is built for the heavy dust loads of the dry mortar industry. We focus on dust-proofing and low maintenance.

• Dust Control: Our electrical cabinets are sealed, and our bearings are shielded to prevent abrasive dry mortar dust from seeping into moving parts.

• Energy Efficiency: We utilize energy-efficient synchronous servomotors for our turning and lifting mechanisms, reducing operational costs compared to pneumatic-heavy systems .

• Speed: Achieve stacking speeds of up to 1,200 bags per hour, drastically reducing labor costs and eliminating the safety risks associated with manual lifting of heavy 25kg loads .

The Future of Your Production Line

Integrating a Dry Mortar Bags Palletizing System is not just about replacing manpower; it is about data, consistency, and safety. By automating the "25kg Bags Stacking Machine" process, you guarantee that every pallet leaving your factory is stable, square, and ready for shipping.

Looking to upgrade your dry mortar line?
Zhengzhou Yishang Machinery Equipment Co., Ltd. offers customizable solutions tailored to your factory layout in Zhengzhou and beyond. Contact our sales team today for a free consultation and a video demonstration of the system in action.

About Zhengzhou Yishang Machinery Equipment Co., Ltd.
Based in Zhengzhou, China—the heart of industrial manufacturing—Yishang Machinery is dedicated to providing high-quality construction material production lines, including dry mortar mixers, sand dryers, and automatic packing & palletizing solutions.+8615137127837