I. Case Summary

This case successfully demonstrates  ES60A- The development process of the YEW model’s translucent TPE material for use in PP overmolding applications for baby bowls. The product must meet stringent requirements. Food-grade (FDA) testing standards and achieve Bottom anti-slip suction the function. The customer went through two rounds of material iteration: the initial proposal The ES60C-01 has poor surface finish. , improvement plan The ES60A-GB also has molding issues. Ultimately, our company launched...  ES60A- YEW, this material ensures food safety while— Perfectly balances surface appearance and processing performance. Successfully gained customer recognition.

 

II. Application Background and Customer Needs

• End product Baby bowl
• Specific components PP with TPE coating (the bowl body is made of PP, and the outer layer is coated with TPE)
• Food safety It must pass FDA food-grade testing to ensure safety for use by infants and young children.
• Anti-slip adsorption The TPE material coating the bottom of the bowl must provide excellent anti-slip performance and be able to stably adhere to the tabletop.
• Excellent appearance The surface is smooth and flat, free of defects, meeting the high aesthetic requirements for baby products.
• Solid rubber coating with efficient molding It bonds firmly with the PP matrix and is easy to process, with smooth demolding.

III. Material Selection and Development Process

1. First trial sample (ES60C-01) ：
2. Test result: NG Although the basic performance is comparable,   “The surface effect is not good.”   This may manifest as flow marks, uneven glossiness, or a hazy surface, failing to meet the high aesthetic standards required for baby products.
3. Second trial material (ES60A-GB) ：
4. Optimization direction Improvements have been made to meet food-grade requirements and address surface issues.
5. Test result: NG Although the food safety issue has been resolved and the appearance has been improved, ...   “Poor molding effect”   This may manifest as excessive fluidity, leading to unstable molding, flash formation, or mold sticking, thereby affecting production yield and efficiency.
6. Final Successful Solution (ES60A-) YEW ) ：
7. Targeted optimization Based on the food-grade standard of ES60A-GB, The formulation’s flowability and processing window have been optimized. We have found the optimal balance between surface quality and molding stability.
8. The test sample result is OK. The customer’s trial molding was successful. The product surface is smooth and aesthetically pleasing, with excellent anti-slip performance, and the production process is stable and highly efficient—all requirements have been met.

IV. Material Comparison and Successful Solutions

The table below clearly illustrates the evolution of material performance from failure to success, highlighting the comprehensive advantages of ES60A-MW.

Comparative analysis ：

• Key Breakthrough: Finding the Optimal Liquidity
  • The failure of ES60C-01 (insufficient liquidity) Its extremely low melt index (3 ± 2) is the direct cause of the “poor surface quality.” Insufficient flowability results in inadequate filling of the material within the mold, making it prone to surface defects such as flow marks and insufficient filling.
  • The failure of ES60A-GB (excessive liquidity) Its melt index (22 ± 8) is excessively high, resulting in “poor molding performance.” Although the excessively high flowability facilitates filling, it also easily leads to flash formation and mold sticking, and the process control window is narrow, making production unstable.
  • ES60A- YEW Success (Liquidity Optimization) : Stabilize the melt index at 9 We’ve found an ideal balance. This ensures excellent high fluidity for a perfect surface finish while also avoiding the molding challenges that come with excessively high fluidity, enabling fast and stable production.
• Comprehensive performance balance
  • ES60A- While ensuring food safety and sufficient mechanical strength (with physical properties comparable to or moderately similar to those of the first three materials), YEW has achieved ultimate optimization of flowability and processability, thereby simultaneously meeting the requirements of: Appearance With Production efficiency Its stringent requirements.

V. Case Summary and Value

• Key to Success ：ES60A- The success of YEW material lies in its precise resolution of the core contradictions identified in the first two rounds of development. It achieves this by... Optimize liquidity to the optimal range. , which makes up for Surface defects caused by insufficient liquidity in ES60C-01 , and also conquered Molding instability caused by excessive fluidity in ES60A-GB , has been realized Food safety, excellent appearance, and efficient, stable production The perfect balance of the three.
• Customer Value ：
  • Security Compliance Ensuring that products meet FDA food-grade standards provides a solid foundation for brand credibility and market access.
  • Outstanding quality Its excellent appearance and reliable anti-slip performance enhance the product’s premium quality and user experience.
  • Highly efficient production Moderate fluidity and stable processing characteristics ensure high production yield and efficiency, thereby reducing overall costs.
• Material positioning This case confirms that...  ES60A- YEW is a high-performance TPE material specifically designed for food-contact-grade, overmolded PP products with stringent appearance requirements—such as infant and toddler products and high-end kitchenware. It represents the ideal choice for balancing safety, aesthetics, and efficiency.