Practice Test Geeks(CPT) Certified Packaging Technologist Practice Test
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Flexible Packaging Technologies Flashcards

7 cards from real CPT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Flexible Packaging Technologies flashcards as text

  1. Which lamination process applies adhesive to one substrate and bonds it to a second substrate under pressure without using heat?

    Answer: Solventless lamination

    Solventless lamination uses a 100% solids adhesive system that requires no drying oven, bonding substrates at room or slightly elevated temperature under nip pressure.

  2. In flexible packaging, what is the primary purpose of a slip additive incorporated into a polyethylene film?

    Answer: Reduce coefficient of friction for handling and machinability

    Slip additives migrate to the film surface and reduce COF, allowing the film to run smoothly on packaging equipment and preventing blocking.

  3. A flexible pouch fails a burst test at the bottom seal but passes at the side seals. What is the most likely root cause?

    Answer: Insufficient dwell time at the bottom seal bar

    Insufficient dwell time prevents complete polymer fusion at the bottom seal bar, creating a weaker bond that fails under internal pressure before properly formed side seals.

  4. What does the term 'retort packaging' specifically refer to in flexible packaging?

    Answer: Flexible pouches or trays that withstand high-temperature sterilization (typically 121°C)

    Retort packaging withstands sterilization temperatures of 121°C (250°F) or higher under pressure, allowing shelf-stable food products without refrigeration.

  5. Which property of EVOH film is most significantly reduced when the material is exposed to high humidity conditions?

    Answer: Oxygen barrier performance

    EVOH is highly moisture-sensitive; absorbed water disrupts the polymer chain interaction that provides its excellent oxygen barrier, causing barrier performance to drop dramatically at high RH.

  6. In gravure printing on flexible packaging films, what is the function of the doctor blade?

    Answer: Remove excess ink from the non-engraved cylinder surface

    The doctor blade wipes excess ink from the smooth land areas of the gravure cylinder, leaving ink only in the engraved cells to be transferred to the substrate.

  7. Which flexible packaging structure would provide the highest level of moisture barrier for a dry snack product?

    Answer: OPP / adhesive / metallized OPP / adhesive / LLDPE

    Metallized OPP provides an exceptional moisture vapor transmission rate barrier, and combining it with OPP and LLDPE in a laminate gives the best overall moisture protection for dry snacks.