Hot Tack Testing of Flexible Packings

Hot Tack Testing of Flexible Packings

The hot tack tester is an essential tool for gauging the seal strength of packages while the seal is still hot. The type of food products largely determines the type of packaging needed, and consequently, the sealing process as well. Effective sealing ensures product safety during the filling process, necessitating precise sealing conditions for a successful outcome.

Manufacturers often encounter seal breakage issues during the filling process due to insufficient strength when the bond is still hot and in the process of cooling to room temperature.

To prevent seal breakage during filling, several key factors must be considered:

1. Polymer Structure: Different polymers exhibit varying behaviors, impacting the performance of the sealant. It's crucial to identify the properties of the polymer to choose the right sealant.
2. Sealant Selection: The selection of sealant is critical and should consider factors like melt index, density, and zero shear viscosity. These parameters influence how the packet behaves during the filling process.
3. Sealing Temperature: It's important to know the temperature at which the sealant forms a bond with the substrate to set the correct sealing temperature.
4. Hot Tack Strength: This refers to the force required to break the seal while it's still hot. A higher hot tack strength indicates lower chances of seal failure and is a key performance indicator for flexible packaging.
5. Dwell Time: The period required for the sealant to form a bond is known as dwell time. While shorter dwell times are preferable for better seal quality, they should not compromise seal strength. A balance is essential.

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What Can a Hot Tack Tester Do?

A hot tack tester measures the hot tack seal strength, i.e., the seal’s strength while still hot. Presto is a leading manufacturer and supplier of seal testing machines, offering highly standardized and precise testing equipment for flexible packings.

For comprehensive testing solutions, consider Cell Instruments' Hot Tack Tester.