Solve long de-residual time & production bottlenecks, full-process upgrading from vaporization, diffusion to active residue removal

After long-term operation of  VHP pass chambers, one major concern from production sites is total cycle duration. Especially in the de-residual phase, slow decay of hydrogen peroxide extends running time. Even when sterilization is completed, materials cannot be transferred out immediately, which negatively impacts production throughput.

Residual removal time is related to loading pattern. Meanwhile, equipment design for VHP vapor delivery, internal circulation and residual H₂O₂ treatment is equally critical.

VHP sterilization is a continuous process. H₂O₂ solution is vaporized and delivered into the chamber. VHP diffusion speed depends on air supply and circulation. After exposure, residual vapor must drop rapidly below the release limit. Therefore, VHP equipment should not be judged merely by its vaporization capability.

HJ Clean’s VHPB series adopts targeted designs across the whole process:

1. High-precision flash evaporation temperature control Temperature during vaporization directly affects H₂O₂ status and sterilization performance. Precise temperature control minimizes unnecessary thermal decomposition, ensuring stable VHP activity entering the chamber and consistent biocidal efficiency.
2. Matched air flow for rapid VHP distribution Insufficient air supply leads to poor vapor diffusion. Hongji VHPB series is designed by inner chamber volume. Selection shall be based on chamber volume, load materials and process requirements, instead of blindly pursuing maximum air volume.
3. Integrated H₂O₂ remover for active residual decomposition Traditional systems rely only on air exchange to purge vapor, heavily limited by chamber volume and adsorptive loads. HJCLEAN units are equipped with H₂O₂ decomposer, which actively breaks down residual hydrogen peroxide into water and oxygen. It shortens de-residual phase instead of passive waiting.

Note: There is no universal fixed de-residual time. Chamber size, loading quantity and packaging material all affect H₂O₂ decay curve. Focus should be placed on residual removal principle and validated performance under worst-case load, not a single number.

1. Computerized data recording for deviation investigationThe system continuously records flash temperature, VHP concentration, RH, temperature and H₂O₂ consumption, generating audit-trail reports. When cycle time suddenly increases, historical curves can be compared to find root cause:

• Parameter drift → equipment issue
• Stable parameters with changed loading → material adsorption issue

1. Practical functions for continuous production Preset sterilization programs, scheduled start-up, LAN network control for multiple synchronized units.

VHP equipment selection requires comprehensive evaluation of chamber size, load type, batch quantity and allowed cycle time. For sites suffering long de-residual time, simply extending purging is not recommended. The whole workflow should be analyzed: vaporization stability, VHP distribution, sterilization profile and active residual treatment.

Vaporization is only the starting point of  VHP sterilization. VHP delivery & diffusion, active residual degradation and full-cycle data traceability determine actual cycle performance, which should be key evaluation criteria during equipment selection.