Resin vs Starch-Based Adhesives for Paper Bag Manufacturing

Both resin and starch-based adhesives can be used to manufacture paper bags. In this article, we’ll break down both adhesives by exploring their properties, pros, and cons as it relates to paper bag manufacturing.

Resin-Based Adhesives

Resin adhesives are synthetic, made from polymers like Poly Vinyl Acetate (PVA) or Vinyl Acetate Ethylene (VAE), often called “white glues.”

Advantages

• Strong Bond: Resin adhesives have increased flexibility, which creates a durable bond, suitable for tasks requiring strength, like carrying heavy items in paper bags.
• Water Resistance: They are often more moisture-resistant, which is crucial for bags designed for transporting anything that could leak through the bag, like food.
• Fast Drying: These adhesives can cure quickly, boosting production speed.
• Stability: Resin adhesives maintain a consistent viscosity throughout their shelf life, helping minimize downtime and reducing variability.

Disadvantages

• Limited Compostability: Being plastic-based, they aren’t as compostable as starch adhesives, though the adhesive’s weight is minimal.
• Higher Cost: Resin adhesives typically cost more per pound than natural starch-based alternatives.

Starch-Based Adhesives

Derived from plant starches like corn, potato, or tapioca, starch adhesives are eco-friendly and sustainable, sometimes called “brown glues.”

Advantages

• Environmentally Friendly: Starch adhesives are more biodegradable and compostable, which can be beneficial in getting a compostability certification, such as BPI.
• Cost-Effective: They generally cost less per pound, reducing manufacturing costs.

Disadvantages

• Weaker Bond: They may not provide as strong a bond as resin adhesives, particularly on a more difficult-to-bond paper stock, limiting heavy-duty use.
• Water Sensitivity: Starch adhesives can lose strength in moist conditions.

Shorter Shelf Life: They may not store as well as resin adhesives, which can affect production efficiency. (For best practices, see how to properly store water-based adhesives.)

Conclusion

Resin-based adhesives excel in strength, speed, and consistency, ideal for high-speed manufacturing, but can cost more per pound and be less compostable. Starch-based adhesives offer sustainability and lower costs but may fall short in strength, water resistance, and viscosity stability. Your choice depends on the paper bag’s intended use, equipment, budget, and sustainability goals.

At Capital Adhesives, we help paper bag converters optimize their production lines by providing high-performance, consistent water-based adhesives. Whether you prefer resin or starch adhesives, we manufacture both and can send samples for validation on your production line.