Autumn winds rise, chestnuts ripen. From October to November each year, chestnut kernels reach peak saccharification—soft, glutinous, and flavorful. To ensure this "limited-time delicacy" remains safe and available year-round, each bag of chestnut kernels must undergo rigorous commercial sterilization before leaving the factory. ZLPH Machinery Technology's spray retort machine has become the preferred choice for chestnut processors, delivering three core advantages: uniform heat distribution, zero deformation, and extended shelf life.
±0.3°C Uniform Heating – Truly "No Dead Corners“
Chestnut kernels are rich in sugar and starch, making them prone to "overcooked outside, undercooked inside" or localized gelatinization if temperatures vary—compromising both taste and safety. ZLPH's retort food machine uses a multi-angle 3D spray system with strategically placed nozzles and multi-stage intelligent temperature control. Temperature differences inside the retort machine are locked within ±0.3°C, ensuring every bag—whether top or bottom—reaches a uniform core temperature of 121°C. Sterilization value (F₀) deviation is ≤3%, improving microbial safety performance tenfold.
±0.05Bar Pressure Control – Smooth Packaging with "Zero Wrinkles"
Soft packaging often suffers from bulging and wrinkling. ZLPH's retort packaging machine integrates dual pressure sensors and a proportional valve micro-control system, limiting pressure fluctuations to ±0.05Bar. The three-stage pressure curve (heating, holding, cooling) synchronizes with internal bag expansion, maintaining a "zero-stress" state throughout sterilization. Post-process bags remain smooth, wrinkle-free, and label-aligned, increasing yield by over 8% and reducing manual re-packaging costs.
Indirect Heating + Rapid Cooling – 24-Month Shelf Life
Traditional steam sterilization often causes oxidation and darkening due to prolonged heating and thermal shock. ZLPH's retort canning machine employs a patented spiral-wound heat exchanger for indirect heating, isolating process water from steam and coolant to prevent cross-contamination. Rapid cooling post-sterilization brings core temperatures below 40°C in ~15 minutes, locking in golden color and glutinous aroma. Tests at 25°C confirm a 24-month shelf life for bagged chestnut kernels, with moisture content at 42%±2%, hardness below 3.5N, and flavor matching freshly peeled chestnuts.
30% Energy Savings
The system requires minimal process water per cycle and eliminates pre-heating venting, reducing steam consumption by 30% compared to traditional retorts.
One-Touch Start – 3-Minute Product Changeover
With PLC recipe management and touchscreen operation, ZLPH's food retort machine stores multiple sterilization programs. Switching between chestnut varieties or packaging sizes takes just 3 minutes by selecting the corresponding recipe. Multi-level access passwords and triple safety interlocking prevent operational errors, ensuring safe 24/7 production.
From e-commerce flagship stores to nationwide convenience stores, ZLPH Machinery Technology’s retort machine delivers precision measured in half-degrees and millimeters—building an invisible yet reliable safety net for bagged chestnut kernels. Choosing ZLPH lets autumn’s flavor transcend seasons, keeping chestnuts soft, sweet, and authentic all year round.
