Shanghai Jimei Food Machinery Co. Ltd

Model Number: JM-11 Brand Name: JIMEI Key Specifications/Special Features: Complete UHT milk processing machineDescription:With a product that can be stored for long periods without spoiling and with no need for refrigeration, there are many advantages for both the producer, the retailer and the consumerThis includes expensive products such as cream, desserts and sauces

In a modern UHT plant (Ultra High Temperature) the milk is pumped through a closed system

On the way it is preheated, highly heat treated, homogenized, ultra highly heat treated, cooled and packed aseptically

Low acid (pH above 4.5 – for milk more than pH 6.5) liquid products are usually treated at 135 – 150C for a few seconds holding, by either indirect heating or direct steam injection or infusion

High acid (pH below 4.5) products such as juice are normally heated at 90 to95°C for 15 to30 seconds holding

All parts of the system downstream of the actual highly heating section are of aseptic design to eliminate the risk of reinfection, include aseptic packaging in packages protecting the product against light and atmospheric oxygen

Ambient storage is normal

Various UHT systems:

There are two main types of UHT systems on the market

In direct systems product comes in direct contact with heating medium, followed by flash cooling in a vacuum vessel and eventually further indirect cooling to packaging temperature

Direct systems are divided into:

• Steam injection systems (steam injected into product)
• Steam infusion systems (product introduced into a steam-filled vessel)

In the indirect systems the heat is transferred from the heating media to the product through a partition (plate or tubular wall)

Indirect systems can be based on:

• Plate heat exchangers
• Tubular heat exchangers
• Scraped surface heat exchangers

Furthermore it is possible to combine the heat exchangers in the direct systems according to product and process requirements