Press lock zippers, also known as press-to-close zippers or press-to-seal zippers, are innovative sealing mechanisms commonly used in flexible packaging to provide airtight and resealable closures. While they are effective in creating a tight seal to prevent air and moisture ingress, they are not specifically designed to support airflow. In fact, their primary function is to restrict airflow to maintain product freshness and extend shelf life.
However, proper airflow is crucial for certain food products to prevent spoilage and maintain optimal conditions for storage. In packaging applications where controlled airflow is necessary, Press Lock Zipper such as for fresh produce or baked goods, packaging solutions with perforations or breathable materials are preferred over press lock zippers.
That said, some packaging designs incorporate features to balance the need for airtight sealing with controlled airflow. For example, resealable pouches with press lock zippers may include small vent holes or microperforations strategically placed in the packaging to allow for limited airflow while still maintaining the integrity of the seal.
In summary, while press lock zippers provide effective airtight sealing to extend shelf life by minimizing air exposure, they are not specifically designed to support airflow. Packaging solutions with controlled airflow features, such as perforations or breathable materials, are preferred for products that require proper ventilation to maintain freshness and quality.
