Why are spray or water immersion sterilization methods used for soft-packaged chili sauce packets?

Soft-packaged chili sauce packets (such as stand-up pouches made of materials like aluminum-plastic composite film) primarily use spray or water bath sterilization. The core reason is that these two methods provide gentle, uniform, and controllable heat conduction, effectively achieving sterilization while maximizing the protection of packaging integrity and product quality.

The specific reasons are as follows:

Protects Packaging Integrity: The pressure and high-temperature resistance of flexible packaging materials (e.g., PET/AL/CPP) is generally inferior to that of metal cans or glass jars. Spray or water bath sterilization is conducted under atmospheric or slightly pressurized conditions. This avoids the significant internal and external pressure differentials created by traditional high-temperature, high-pressure steam sterilization, preventing pouch expansion, rupture, or seal failure.

Uniform Heating Ensures Sterilization Efficacy: Chili sauce is a viscous semi-fluid with relatively slow heat conduction.

Spray Sterilization: High-velocity, multi-angle hot water spray rapidly and uniformly transfers heat to all parts of the package, especially the seal edges and the center of the product, ensuring no sterilization dead zones.

Water Bath Sterilization: Immersion in hot water also facilitates a uniform heating process.

Precise Temperature Control Optimizes Product Quality: Both methods allow for precise temperature control (e.g., within the 90-95°C range), utilizing the principle of "Pasteurization." This effectively kills pathogenic and spoilage microorganisms while maximizing the retention of the chili sauce's fresh color, flavor compounds (volatile aromas), and texture. It avoids the "overcooked" flavor, darkening, and nutrient loss associated with prolonged high-temperature cooking.

Suitable for Continuous Production: Spray and water bath sterilization equipment is easily automated for continuous operation, offering high production efficiency, making it highly suitable for large-scale production of soft-packaged products.

In summary: Spray and water bath sterilization are among the optimal choices for balancing food safety, packaging compatibility, and product sensory quality.