The Sonoco Alcore Technical Approach
Why do we specify our cores on outside diameter stiffness and not flat crush?
Flat crush simply measures the amount of compression strength it takes on the top and bottom of the core for it to break. In reality, when metals are wound on a core forces are not only exerted on the top and bottom of the core. Simply, flat crush does not tell you the most accurate needs or specification in which to design a core for metal applications.
What is outside diameter stiffness?
This is how much the outside diameter shrinks due to wound pressure.
Why should metal producers be concerned with outside diameter stiffness?
Sonoco Alcore focuses on specifying a core for outside diameter stiffness and sufficient wall thickness to meet the needs of metal producers and your production process, avoiding issues such as v-buckles, sagging, telescoping, scratches and longitudinal breaks in the core.
Specifying using outside diameter stiffness provides a cost-effective core solution with more reliable core performance
Outside diameter stiffness and core wall-based design benefits:
- Reflects the load placed on a core by the winding process
- Prevents v-buckle and sagging issues by allowing a wider range of web tensions
- Provides a good core design foundation for forming a metal roll, which is especially important for supporting the inner layers
- Delivers cost savings on core spend and production issues