The GK35-6A is a fully automatic, high-speed industrial bag sewing machine engineered for reliable, precision bag closing across a wide range of packaging materials and industries. Designed as a complete bag sealing solution, this machine performs automatic single-needle, double-thread chain stitch (stitch type 401) closing of all types of filled bags, operating at speeds of up to 2000 stitches per minute. Whether you are running a flour mill, grain storage facility, fertilizer plant, chemical processing unit, or food packaging line, the GK35-6A delivers consistent, clean, and durable bag seals at industrial scale.

What Is the GK35-6A Bag Closing Machine?

The GK35-6A is an automatic bag closer that starts and stops on its own using a built-in photoelectric sensor. When a filled bag enters the machine on the conveyor, the light-controlled switch automatically activates the stitching process. Once the bag passes through, the machine stops and the electro-pneumatic guillotine thread cutter cuts the thread chain cleanly and precisely — all without any manual intervention. This makes the GK35-6A one of the most operator-friendly and production-efficient bag closing machines available for industrial packaging environments.

It supports both plain closing and crepe-tape bound closing, giving it the flexibility to meet varied packaging requirements across industries.

Compatible Bag Types and Industries

The GK35-6A automatic bag sewing machine is compatible with a broad range of bag materials and packaging types, including:

• Plastic woven bags (PP woven sacks)
• Paper bags and multi-wall paper sacks
• Paper-plastic composite bags
• Aluminum-coated paper bags
• Jute or fabric-based bags (where applicable)

In terms of industry applications, the GK35-6A is widely used for closing bags filled with:

• Flour, rice, grain, and cereals
• Animal feed and pet food
• Fertilizers and agrochemicals
• Sugar, salt, and food-grade powders
• Seeds and plant nutrition products
• Coffee, tea, and dried goods
• Chemical powders and industrial minerals
• Coal, cement, and construction-grade materials

This level of material compatibility makes the GK35-6A one of the most versatile industrial bag stitching machines available in its class.

Key Features of the GK35-6A

1. Fully Automatic Start-Stop Operation The machine uses a photoelectric sensor (light-controlled switch) to detect incoming bags and automatically begin the stitching cycle. After each bag passes through, the machine stops and the thread is cut automatically. This fully automated cycle eliminates operator fatigue, reduces errors, and significantly improves throughput on high-volume packaging lines.
2. High-Speed Stitching at 2000 RPM With a maximum operating speed of 2000 revolutions per minute, the GK35-6A is built for high-volume industrial production. Depending on the type of bag, conveyor speed, and infeed method, the machine can process six to twelve or more bags per minute, making it suitable for continuous packaging operations.
3. Single Needle Double Thread Chain Stitch (Type 401) The GK35-6A uses the internationally recognized chain stitch type 401 — a single needle, double thread configuration that produces strong, consistent, and tamper-evident seals. This stitch type is widely trusted in the food, agricultural, and chemical packaging industries for its reliability and stitch integrity.
4. Adjustable Stitch Width (6.5–11 mm) The stitch width is adjustable within the range of 6.5 to 11 mm, allowing the machine to handle bags of varying thickness — up to 8 mm of material depth and up to 32 plies of paper. This makes it suitable for both lightweight and heavy-duty bag construction.
5. Electro-Pneumatic Guillotine Thread Cutter The built-in air cylinder-operated guillotine-type cutter ensures clean and reliable thread cutting after every bag. This pneumatic cutter works automatically in sync with the stitching cycle, reducing thread waste and maintaining a neat finish on every sealed bag.
6. Comprehensive Automation Functions The GK35-6A performs all core bag-closing tasks in one automated pass, including:

• Dust cleaning of the bag opening
• Edge binding and alignment
• Stitching and thread chaining
• Automated thread cutting
• Heat sealing (in compatible configurations)
• Press closing for secure seals

7. Dust-Proof and Contamination-Resistant Sealing The sealed stitch produced by the GK35-6A is dust-proof, moisture-resistant, and provides strong protection against contamination and infestation. This is especially important in food-grade, pharmaceutical, and agricultural packaging environments where seal integrity directly affects product quality and regulatory compliance.
8. Conveyor Integration The GK35-6A is designed to be mounted on a belt conveyor and sewing column assembly, enabling full integration into existing packaging lines. It is compatible with conveyor systems including LFS1500, LFS2000, LFS2500, and LFS3000, as well as standard sewing machine table setups.
9. Automatic Bag Counter The machine includes an automatic bag counting function, which helps production supervisors track output, manage shift-based production targets, and maintain packaging records without manual tallying.

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📊 Technical Parameters

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Why Choose the GK35-6A for Your Packaging Line?

Selecting the right bag closing machine is a critical decision for any industrial packaging operation. The GK35-6A is engineered to reduce downtime, minimize labor dependency, and deliver consistently high seal quality across diverse bag materials and production volumes. Here is why it stands out among industrial bag sewing machines:

• Reliability in demanding environments: Built from high-quality alloy steel and wear-resistant components, the GK35-6A is designed for continuous-duty operation with minimal maintenance requirements.
• Operational simplicity: The automatic start-stop system means operators do not need to physically interact with the machine during each cycle, reducing workplace fatigue and the chance of operator error.
• Flexibility across materials: From lightweight paper bags to heavy PP woven sacks, the adjustable stitch settings and broad needle compatibility allow the machine to adapt to different packaging requirements without major reconfiguration.
• Integration-ready design: The machine mounts easily onto conveyor columns and integrates smoothly into new or existing automatic packaging lines, making it scalable for growing production facilities.
• Compact footprint: At just 350 × 240 × 440 mm and 28 kg, the GK35-6A is compact enough to fit into space-constrained packaging environments without sacrificing performance.

GK35-6A vs. Manual Bag Closing: A Practical Comparison

In environments where manual or semi-automatic bag closing is still used, switching to the GK35-6A automatic bag sewing machine typically results in measurable gains in output speed, seal consistency, and labor cost reduction. Manual bag closing depends entirely on operator skill and stamina, which introduces variability in seal quality. The GK35-6A eliminates this variability by standardizing every seal through its automated chain stitch cycle, producing uniform results regardless of shift duration or operator experience.

Frequently Asked Questions

What types of bags can the GK35-6A close? The GK35-6A can close plastic woven bags, paper bags, paper-plastic composite bags, aluminum-coated paper bags, and other similar filled packaging materials.

What is chain stitch type 401? Chain stitch 401 is a single needle, double thread industrial stitch widely used for bag closing. It creates a strong, consistent seam that can be opened easily for emptying the bag while remaining secure during transport and storage.

Can the GK35-6A be used on a conveyor system? Yes. The GK35-6A is designed for conveyor mounting and is compatible with standard belt conveyor and column setups used in industrial packaging lines.

What industries use this machine? It is used in agriculture, food processing, chemical manufacturing, mining, fertilizer production, grain storage, animal feed, and port logistics industries.

Is the GK35-6A available with a reverse-direction version? Yes. The GK35-6AF is the left-hand (reverse-direction) variant of the GK35-6A. Both models can be paired on the same conveyor column to simultaneously stitch bag openings from both sides.

The GK35-6A automatic bag sewing machine represents a proven, cost-effective solution for industrial bag closing operations that demand high speed, precision stitching, and dependable performance across multiple bag materials. Its fully automated cycle, robust mechanical construction, and seamless conveyor integration make it a reliable addition to any packaging line seeking to improve efficiency and seal quality.