In the medical device manufacturing industry, the production of PP (polypropylene) syringes must adhere to exceptionally strict standards. A critical pain point for many manufacturers is poor ink adhesion on graduations and scales. When markings become blurry or peel off during use, it doesn't just lead to product rejection—it creates a significant medical safety hazard.
The challenge lies in the material itself. Polypropylene (PP) is a non-polar, crystalline plastic with extremely low surface tension. Printing on it is comparable to trying to write on a greased surface; standard screen printing inks simply cannot "grip" the substrate.
Traditionally, manufacturers have relied on flame treatment or corona treatment to increase surface energy before printing. However, these methods introduce several drawbacks:
The most efficient way to solve this at the root is by switching to a professional No-Treatment PP Syringe Screen Printing Ink. To solve production bottlenecks, a high-quality medical-grade ink must meet these four core performance indicators:
Peeling ink on PP syringes is a solvable problem. By adopting specialized inks designed for low-surface-energy plastics, manufacturers can bypass unstable pretreatment stages, reduce costs, and—most importantly—ensure the safety of the end-user. Partnering with an expert ink supplier is the strategic move to boost your product’s reliability and your company's competitive edge.
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