What is the glue used in paper bag making machine?

The glue used in a paper bag making machine is typically a type of water-based adhesive or hot melt adhesive. The choice of glue depends on the type of paper bag being produced, the machine, and the desired application. Here are the most common types of glue used in the process:

1. Water-Based Adhesive (Cold Glue)

Water-based adhesives are widely used in the paper bag making industry. These adhesives are environmentally friendly, non-toxic, and easy to apply. Common types include:

- Polyvinyl Acetate (PVA) Glue: This is one of the most commonly used water-based adhesives in paper bag manufacturing. It bonds well to paper, dries clear, and is cost-effective.

- Starch-Based Adhesives: Derived from natural sources like corn, potato, or wheat starch, these adhesives are biodegradable and eco-friendly. They are often used in the production of paper bags where sustainability is a priority.

- Dextrin Adhesive: Made from starch, dextrin adhesives are commonly used for lighter paper bags, providing a strong bond that dries quickly.

2. Hot Melt Adhesive

Hot melt adhesives are used when a stronger, faster-drying bond is needed, particularly in high-speed paper bag making machines. These adhesives are solid at room temperature and are applied in molten form using specialized equipment in the machine.

- EVA (Ethylene Vinyl Acetate): A popular hot melt adhesive used in the paper bag industry due to its excellent bonding properties and resistance to environmental factors like moisture and temperature.

- Pressure-Sensitive Adhesive (PSA): This type of hot melt adhesive remains tacky and is often used for self-sealing paper bags. It offers a strong bond that can handle higher stresses.

3. Polyurethane (PUR) Glue

Although less common, polyurethane adhesives are sometimes used for specific applications where very strong and flexible bonding is required, such as in luxury or laminated paper bags.

Factors to Consider When Choosing Glue for Paper Bag Making

- Bag Type: The strength and purpose of the paper bag (e.g., grocery bag, luxury bag) will dictate the type of glue.

- Machine Speed: Faster machines may require hot melt adhesives for quick drying.

- Environmental Considerations: For eco-friendly or biodegradable paper bags, water-based or starch adhesives are preferred.

- Cost Efficiency: Water-based adhesives are usually more affordable, while hot melt adhesives provide faster bonding at higher costs.

In conclusion, the adhesive choice for paper bag making is crucial for both the durability and production efficiency of the bags, with water-based and hot melt adhesives being the most commonly used options.

Wenzhou Zhengding Packaging Machinery Co.,Ltd， formerly Ruian Zhengdong Packaging Machinery Co.,Ltd. is a technical enterprise that manufacture and develop the environmental friendly paper based courier and e-commerce bags making machine and PP stationery making machine, which has over twenty years machine manufacturing experience.Visit our website at https://www.zhengdingcn.com to learn more about our products. For inquiries, you can reach us at Office@nbzjnp.cn.