kraft paper bag sealing machine
The kraft paper bag sealing machine is an automated packaging system integrating automatic bag feeding, positioning, sewing, hot-melt sealing, cutting, and stacking. It is designed for paper-plastic composite and kraft paper woven bags used in powder, feed, chemical, and building material packaging. The machine uses PLC touch screen control with servo and frequency conversion coordination to ensure stable operation and high efficiency. Through vacuum suction bag feeding and automatic correction, bags are accurately conveyed to the sewing unit for high-speed double-thread stitching, followed by hot-melt tape sealing and precise cutting. The finished bags are neatly stacked and counted automatically, significantly reducing manual labor, improving sealing quality, and increasing production efficiency.
Core advantages of the product
The fully automatic kraft paper bag sealing machine is designed for automatic sewing and hot-melt sealing of kraft paper and paper-plastic bags. It features PLC control and photoelectric detection for accurate operation. The machine integrates feeding, sewing, sealing, cutting, counting, and stacking in one process, delivering stable performance and speeds of up to 45 bags per minute.
High Production Capacity
Capable of producing 35–45 bags per minute, the machine integrates automatic bag feeding, alignment, sewing, hot-melt sealing, cutting, counting, and stacking into one continuous workflow. This highly automated process minimizes manual handling, reduces labor costs, and ensures consistent production quality. The stable conveying and synchronized control system enable efficient operation throughout long production cycles, making it an ideal solution for manufacturers seeking higher productivity and lower operating costs.
Strong and Leak-Proof Sealing
The machine combines high-speed sewing technology (up to 2600 rpm) with hot-melt tape sealing to create a strong, secure, and leak-resistant bag bottom. The heated adhesive tape effectively covers stitching holes and sewing lines, preventing powder or granular materials from leaking during storage and transportation. This sealing method improves package integrity, enhances product protection, and helps manufacturers meet higher packaging quality standards in demanding industrial applications.
Wide Bag Size Compatibility
Designed to handle kraft paper bags and paper-plastic composite bags, the machine supports bag lengths from 500–1100 mm and widths from 350–650 mm. Adjustable guides and feeding components allow quick adaptation to different bag specifications without complex mechanical changes. This flexibility enables manufacturers to produce various bag sizes on a single machine, reducing equipment investment while improving production versatility and responsiveness to changing market requirements.
Intelligent Automation Control
Equipped with a PLC-based control system and touch-screen interface, the machine allows operators to easily adjust production parameters such as bag dimensions, sewing settings, counting quantity, and operating speed. Real-time monitoring and automatic coordination of machine functions improve production accuracy and consistency. The user-friendly control system reduces operator training requirements, minimizes human error, and helps maintain stable performance during continuous industrial operation.
Precision Feeding and Alignment
The advanced vacuum suction feeding system automatically separates individual bags from a stack and transfers them smoothly into the production line. Combined with photoelectric detection and automatic alignment technology, the machine accurately positions each bag before sewing and sealing. This design prevents double feeding, reduces material waste, and improves processing accuracy, ensuring smooth operation and high-quality finished products even during high-speed production.
Servo-Controlled Cutting System
A servo-driven rotary cutting mechanism works together with photoelectric sensors to detect bag spacing and perform precise cutting operations. This system delivers clean and consistent cuts while maintaining synchronization with the sewing and sealing processes. Compared with conventional cutting methods, servo control provides greater accuracy, smoother operation, and reduced maintenance requirements, resulting in improved product appearance and enhanced production reliability.
Automatic Counting and Stacking
After sealing and cutting, finished bags are automatically counted, conveyed, and stacked into neat bundles for easy handling. The integrated counting function improves production management by providing accurate output records and reducing manual counting errors. Neatly stacked bags simplify downstream packaging, palletizing, warehousing, and transportation processes. This automation helps improve workplace efficiency, reduce labor intensity, and support continuous high-volume production.
