Upgrading Pasteurization Processes for Pet Wet Food: From Thermal Penetration to Packaging Integrity

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Spray Retort: Solving the Conflict Between F0 Value Fluctuation and Flexible Packaging Deformation

      In the industrial production of pet wet food (such as cat treats, pouches, and foil bowls), the sterilization stage is the core link that determines commercial sterility and shelf-life stability.

Two Major Process Pain Points of Traditional Water Immersion Sterilization:

Uneven Heat Distribution: There are cold spots within the retort, leading to lagging thermal penetration and fluctuating F0 values (sterilization intensity). This results in uncontrollable batch-to-batch microbial risks and a high tendency for late-stage swelling.

Compromised Package Integrity: During the heating and cooling stages, gases in the headspace expand or contract violently. Without precise back pressure control, it leads to issues like collapsed pouches, crumpled tubes, and deformed foil containers, driving up the scrap rate.

Technical Advantages of Spray Retorts:

Uniform Heat Distribution: A high-pressure atomized spray system breaks the sterilization water into micron-sized mist. The temperature difference within the retort is controlled within ±0.5°C, ensuring precise F0 value compliance for every batch.

Dynamic Back Pressure Technology: During the heating and cooling stages, the PLC system automatically adjusts the injection of compressed air to precisely counteract the internal pressure of the package, achieving "zero-deformation" sterilization. It is perfectly compatible with soft pouches, tubes, and irregular-shaped foil containers.

Efficient Heat Exchange & Energy Saving: Requires only a small amount of circulating water. Combined with a waste heat recovery system, steam consumption is reduced by over 30% compared to full water immersion. This shortens the come-up time and improves production line efficiency.

Data Traceability & Compliance: The fully automatic HMI interface records temperature, pressure, and time curves in real-time, meeting audit requirements for HACCP systems and thermal process validation.

      Whether it's high-viscosity cat treats or easily deformable gold foil bowls, spray sterilization is currently the optimal solution for achieving both "commercial sterility" and "zero-damage product appearance."

I am Zongon Company, specializing in sterilization process equipment. Feel free to send us samples. We will provide you with a customized thermal process schedule and equipment selection plan through laboratory thermal testing. Sunny 8615169670012