Yondo Corrugated Plastic Products Ltd

Ink peeling off corrugated plastic sheets is a common concern in printing applications, especially when producing outdoor signs, promotional displays, packaging, and customized PP products. Understanding the causes of poor ink adhesion can help manufacturers and buyers improve print quality and achieve more durable results.

One of the main reasons is the low surface energy of polypropylene (PP). Corrugated plastic sheets are typically made from PP, a material that naturally resists wetting and makes it difficult for ink to bond firmly to the surface. Without proper surface treatment, ink may not adhere well and can peel, scratch, or rub off after printing.

Another important factor is insufficient surface treatment. Processes such as corona treatment increase the surface energy of PP sheets, allowing ink to spread more evenly and adhere more effectively. However, if the treatment level is too low or decreases during storage, printing performance may be affected. Testing the surface energy before printing can help ensure suitable conditions for ink adhesion.

The type of ink also plays a significant role. Not all inks are compatible with polypropylene. Using an unsuitable ink may result in weak bonding, even when the sheet has been properly treated. Selecting ink specifically formulated for PP materials and following the ink manufacturer's recommendations can help reduce peeling problems.

Printing conditions can also influence the final result. Dust, oil, moisture, or other contaminants on the sheet surface may interfere with ink adhesion. In addition, improper drying or curing can prevent the ink from forming a durable bond. Maintaining a clean printing surface and following the recommended drying or curing process are essential for consistent quality.

To prevent ink peeling, manufacturers should focus on several key steps: ensure adequate surface treatment, select compatible printing inks, keep the sheet surface clean, and control printing and curing conditions. Conducting adhesion tests before mass production is also recommended, particularly for customized orders and products intended for outdoor use.

At Mantis, we manufacture PP corrugated plastic sheets for a wide range of applications, including signage, packaging, and industrial protection. With appropriate surface treatment and printing process control, our sheets can be prepared to meet different printing requirements. If you are looking for customized corrugated plastic sheets with reliable print performance, our team can help you select suitable specifications for your application.