Material Document
Formal agreements between packaging buyers and suppliers must define the exact physical and chemical properties of the paperboard required for a specific product line. This technical agreement, known as a packaging substrate specification, serves as the legal and operational baseline for quality control and material acceptance. Having a clear document prevents misunderstandings regarding the capability of the board to withstand the stresses of high-speed filling lines and distribution.
Technical Variable
The document details critical parameters including basis weight, caliper, moisture content and surface treatment, alongside tolerances for each value. It also outlines structural requirements such as stiffness, surface strength and tear resistance, which are necessary to ensure the runnability of the substrate. For food-contact applications, the specification must also list the required compliance certificates and chemical migration limits.
This detailed compilation of properties ensures that the purchasing department can source equivalent materials from alternative mills without risking the performance of the packaging on the production floor.
Quality Agreement
Well-defined tolerances protect both parties by establishing the clear conditions under which a batch of board can be rejected. When the substrate properties deviate from the specified values, it can lead to failures such as carton jams or poor ink adhesion. Maintaining an updated specification sheet ensures that the supplier is held accountable for consistency across different production lots.
