Vacuum Precooling & Cold Chain Solution for Hong Kong Fresh Vegetables

Vacuum Cooling System | Leafy Vegetable Cold Chain | Postharvest Fresh Preservation Solution

With the increasing food safety and freshness requirements in the Hong Kong market, traditional transportation methods without rapid precooling can no longer meet the standards of high-end vegetable supply chains.

Especially for leafy vegetables such as:

• Choy Sum
• Lettuce
• Spinach
• Romaine Lettuce
• Broccoli
• Coriander
• Mushrooms

postharvest temperature control directly affects:

• Freshness
• Shelf life
• Transportation loss
• Market appearance
• Final selling price

Yuanxian Machinery specializes in:

• Vacuum precooling systems
• Postharvest vegetable preservation systems
• Food vacuum cooling systems
• Cold chain engineering solutions

We provide complete:

“Rapid Precooling + Full Cold Chain + Standardized Freshness Management” solutions.

Why Vacuum Precooling is Important?

Fresh vegetables continue respiration after harvesting.

Without rapid cooling, vegetables may quickly develop:

• Yellow leaves
• Water loss
• Softening
• Rotting
• Short shelf life
• Reduced market quality

Especially for the Hong Kong market, vegetables usually require:

2–5 days of shelf life after arrival.

Therefore:

Rapid precooling within 30–60 minutes after harvest is critical.

Advantages of Vacuum Precooling

Compared with traditional cold storage cooling:

Vacuum precooling offers major advantages:

Fast Cooling Speed

Typically:

• Complete cooling within 20–30 minutes
• Uniform internal temperature reduction

Example:

• Choy Sum: 30°C → 3°C
• Lettuce: 28°C → 2°C

Better Freshness Preservation

Rapidly reduces respiration intensity and effectively minimizes:

• Yellowing
• Water loss
• Rotting
• Softening

Greatly extending shelf life.

Improved Market Appearance

Maintains:

• Leaf firmness
• Color
• Moisture
• Freshness

Increasing market value.

Reduced Transportation Loss

Effectively reduces:

• Cold chain losses
• Delivery losses
• Supermarket waste

Improving overall profitability.

Standard Cold Chain Workflow

Harvesting During Low Temperature Period
↓
Precooling Within 30–60 Minutes
↓
Rapid Vacuum Cooling
↓
Sorting & Packaging
↓
Cold Storage
↓
Refrigerated Transportation
↓
Hong Kong Wholesale / Supermarket / Catering

Yuanxian Complete Solution Vacuum Precooling System

Including:

• Vacuum precooler
• Water capture system
• Chilled water circulation system
• PLC automatic control system

Cold Chain System

Including:

• Precooling buffer room
• Cold storage
• Refrigerated transportation
• Temperature & humidity monitoring

Traceability Management

Recommended records include:

• Farm block management
• Batch coding
• Temperature records
• Pesticide residue inspection
• Harvest records

Ensuring complete product traceability.

Suitable Products

This solution is especially suitable for:

• Choy Sum
• Lettuce
• Spinach
• Romaine Lettuce
• Broccoli
• Coriander
• Green onion
• Mushrooms

and other high-value leafy vegetables.

About Yuanxian Machinery

Yuanxian Machinery has extensive experience in:

• Vacuum precooling systems
• Food vacuum cooling systems
• Cold chain engineering
• Postharvest preservation solutions

We provide complete:

“Equipment + Process + Cold Chain + Standardization” integrated solutions.