1. Tetra Therm Lacta B ®
Pasteurisation module based on automatic
processing and push button operated sequences
Application The process control is semi-automatic. By pressing
Tetra Therm Lacta B is designed for processing and push buttons, the operator initiates the required func-
pasteurisation of market milk, cheese milk, yoghurt milk, tions, such as starting the pumps and changing the set
cream, ice-cream mix, etc. point on the temperature controller. The pasteurisation
temperature and the position of the flow diversion valve,
Working principle are continuously recorded.
After the balance tank, the product is preheated in the
regenerative section of the plate heat exchanger by the Standard process data
outgoing pasteurised product. In the heating section, the Market Yoghurt Cheese Cream
product is heated to pasteurisation temperature by hot milk milk milk
water generated in a steam heated hot water unit. Then Inlet temp., °C 4–8 4–8 4–8 4–8
the product passes through the holding tube, dimen- Pasteurisation temp., °C 72 90–95 72 85–95
sioned for a specific holding time. Holding time, s 15 300 15 3
Separation and
After the holding tube, the product is cooled by the
homogenisation temp., °C >55 – – –
incoming product in the regenerative section. If required,
Outlet temp., °C 4 40–45 28–32 6–8
the product is further cooled by ice water in the final
Deaeration temp., °C 68–70 68–70 – –
cooling section.
Heat regeneration,% 90 90 90 80
Right after the holding tube, the flow diversion valve
automatically diverts insufficiently heated product to the
balance tank.
TM

2. ®
Tetra Therm Lacta B – Pasteurisation module based on
automatic processing and push button operated sequences
Basic design Options
Tetra Therm Lacta B is a pre-tested pasteurisation • Design complies with relevant EU directives:
module. All components are mounted on a stainless steel – Higher pressure on pasteurised side
frame, except for the PHE. – Differential pressure device for display, registration
Scope of supply: and alarm
• Balance tank (BTD) with level control – Protection sheets on PHE
• Centrifugal product feed pump • Automatic product circulation, interlocked with flow
• Flow control (mechanical flow controller, frequency diversion and BTD low level switch
controlled pump, or homogeniser as timing device) • Automatic cream circulation, interlocked with flow
• Free-standing plate heat exchanger (PHE) with diversion and BTD low level switch
Teknotext AB
cooling, regenerative, and heating sections • Increased/decreased heat regeneration
• Holding tube, on top of the module • Automatic outlet and/or intermediate temperature
• Hot water unit, incl. PHE, pump, steam valve and trap, control
expansion vessel, shut-off valves, etc. • Registration of outlet temperature
• Control panel including; relay/regulator control, push • CIP by external circulation, reducing number of
buttons, recorder, solenoid valves, and motor starters cleaning circuits
• Push button operated sequences • Start/stop buttons for Tetra Alrox Lacta
• Automatic pasteurisation temperature control • Capacity control for homogeniser
• Automatic flow diversion, interlocked with tempera- • Circular recorder
ture failure before and after the holding tube • Remote on/off for homogenisation pressure
• Registration of pasteurisation temperature and
position of flow diversion valve Additional modules
• CIP by internal circulation over BTD • Tetra Alrox Lacta S deaeration module
• Tetra Centri separation module
• Tetra Alfast automatic standardisation module
Installation data • Tetra Alex homogeniser for full or partial
Typical footprint for basic module excluding PHE:
homogenisation
Capacity, l/h ≤ 10 000 > 10 000
• Spiral holding cell for increased holding time
Length, mm 2 400 3 000
Width, mm 1 000 1 000
Capacity
Height, mm 2 300*) 2 300*) Milk pasteurisation 2 000 – 35 000 l/h
*) Higher if holding time more than 15 seconds.
Cream pasteurisation 1 000 – 10 000 l/h
Simplified flowchart Flow diversion
Tetra Alfast
standardisation
valve module
Surplus
Hot water unit
cream
Code PD 63517 en1 00-04
Product IP
circulation Tetra Alex
Milk out valve Steam homogeniser
Tetra Plex By-pass at partial
plate heat homogenisation
exchanger
Whole milk
Control panel Tetra Centri Standardised milk
separator
Tetra Pak
Tetra Therm
Lacta
Holding Skimmilk
tube Cream
Ice water
Hot water
© 2000 Tetra Pak Dairy & Beverage Systems AB, Lund, Sweden.
Steam
Tetra Alrox Diverted flow
Flow controller Lacta
deaerator
Milk in
Balance tank Additional modules
We reserve the right to introduce design modifications without
prior notice. Tetra Pak and Tetra Therm are trademarks belonging
to the Tetra Pak Group.