Ensuring Quality with Confectionery Packaging: Test Purpose, Process, and Materials

Flex Tester and ASTM F392: Understanding the Gelbo Flex Test Method

Confectionery packaging plays a critical role in maintaining the quality, freshness, and shelf life of sweets. To meet the demands of both consumers and regulators, packaging must endure flexing, bending, and handling throughout its lifecycle. This is where the Gelbo-Flex-Testverfahren—outlined in ASTM F392—proves essential. It uses a Elastomerprüfgerät to assess the Flex-Haltbarkeit of packaging materials, especially flexible films commonly used in candy wraps.

Der Elastomerprüfgerät subjects a packaging sample to simultaneous twisting and compression motions. This simulates the repetitive mechanical stress the packaging may experience during shipping and handling. The Flex-Haltbarkeit is evaluated by checking for pinholes or barrier breaches, which compromise the protection of the product inside.

Purpose of the Gelbo Flex Test in Confectionery Packaging

The primary goal of the Gelbo-Flex-Test is to simulate real-world stress conditions and assess how resistant the confectionery packaging material is to mechanical fatigue. By testing for Flex-Haltbarkeit, manufacturers can:

• Detect weaknesses in multilayer films
• Reduce product spoilage due to oxygen or moisture ingress
• Sicherstellung der Einhaltung von ASTM F392 and industry safety standards
• Improve material selection and product shelf life

Ultimately, this improves packaging performance while protecting the confectionery product and brand integrity.

Test Process for Flex Durability Using a Flex Tester

1. Probenvorbereitung: Cut samples of the packaging film to the specified dimensions (as per ASTM F392).
2. Machine Setup: Insert the sample into the Elastomerprüfgerät, typically a Gelbo-Flex-Prüfgerät, and set parameters such as number of flexes, cycle rate, and angle.
3. Flexing Procedure: The machine twists and compresses the sample for a pre-defined number of cycles.
4. Inspection: After testing, evaluate the sample for pinholes using dye penetration or gas transmission methods.
5. Result Interpretation: Determine material durability by the number and size of pinholes detected.

This method ensures that the packaging maintains its barrier integrity throughout the supply chain.

Application Materials in Confectionery Packaging Testing

Materials tested using the Gelbo-Flex-Test include:

• Biaxially-oriented polypropylene (BOPP)
• Polyethylene (PE)
• Metallized films
• Laminates with aluminum or paper

These films are common in candy wrappers, pouches, and sachets. Testing ensures that they retain protective properties during processing, transportation, and storage.

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