Pasteurization

Pasteurization involves heat treatment of substances, which aims to curb or destroy almost all of pathogenic microorganisms while maintaining the taste of the products and to avoid a reduction in their nutritional value . Main task of pasteurization is to extend the life of a product . This name comes from the Louis Pasteur, who developed the method . Commonly, the products are heated to a temperature of 70 ° C to 100 ° C. Pasteurization are subject products such as milk, wine, beer, meat, cold cuts and fruit (marmalades, jams, juices). Pasteurized products are stored in airtight containers.

We distinguish two types of heat treatment:

  • long Pasteurization – treatment at a low temperature of 63 ° C for 30 minutes.
  • mild pasteurization – mild treatment at 72 ° C for 15 – 30 seconds.

The table below shows the temperature and the time accepted as sufficient to destroy pathogens.

The minimum time-temperature combination recommended for pasteurization by the Board d / s Articles Food and Drug Administration (FDA).

Dairy Products Method Temperature Time
Milk: normal, low-fat, skim LTLT* 62,8 30 min.
Cream, milk with chocolate LTLT 65,6 30 min.
Ice Cream LTLT 68,3 30 min.
Milk: normal, low-fat, skim HTST** 71,7 15 s
Cream, milk with chocolate HTST 74,4 15 s
Ice Cream HTST 79,4 25 s
Milk: normal, low-fat, skim HTST** 88,3 1 s
Milk: normal, low-fat, skim HTST 90 0,5 s
Milk: normal, low-fat, skim HTST 94 0,1 s
Milk: normal, low-fat, skim HTST 95,5 0,05 s
Milk: normal, low-fat, skim HTST 100 0,01 s
All liquid products U-P**** 137,8 2 s

LTLT * – low temperature, long time pasteurization or baths (detention method )

HTST** – high temperature short time pasteurization.

U-P **** – ultra-pasteurized heating can take place before or after packaging.

Types of pasteurization shown in the table below:

 

Type Of Pasteurization Condition Use For
long-term or otherwise low Temp. 60-65 C , longer pasteurization time Milk , Juice , ice Cream ,

Bottled Beer

High Temperature and for short time – HTST High Tem. and short pasteurization time Milk , Juice, Ice Cream
Instant Heat up to Temp. of 85-90 C and instantly cool down Milk
High High Temp. of  85-100 C and keep it for 15-30 seconds Cream

General guidelines that must be taken into account when pasteurizing:

 

–  Milk should be pasteurized as soon as possible after milking. Warm milk can be pasteurized faster than the pre-cooled milk. This prevents the growth of bacteria.

– Once the target temperature is reached we should   cool dwn the substance as fast as possible.

– After pasteurization we should  carefully and thoroughly washe the pasteurizer.

 

Margo  company also produces many types of mixing tanks . The mixing tank as a device for heat treatment of milk is used in the dairy industry. However, it may also be applicable in other industries: food, chemical or pharmaceutical industry, as well as where there is a required processes for mixing, heating and cooling products.

 

All of Margo  tanks are produced from stainless steel material AISI 304 or AISI 316 .

 

Our tanks have many benefits:

  • Made in accordance with applicable standards,
  • Easy to clean and maintain thanks to excellent finish and accessibility to all components,
  • Control panel designed in accordance with the needs of the individual customer,
  • Possibility of multiple processes in a single device (heating, mixing and cooling substances),
  • Easy to use,
  • Environmentally friendly,
  • Manufactured for long-term and reliable operation of high-quality steel,
  • Have low energy consumption and are very efficient.

 

The mixing process is done by  a single rotary mixer. Depending on the substance we want to mix,  we can use a paddle , screw or a frame stirrer. Both the   gearbox and agitator speed  is matched to the individual needs of the customer, taking into account the type and density of the substance.

Each  Mixer is equipped with a control panel has an electronic thermostat programmed according to customer expectations.

Mixing Tanks produced by Margo have:

– Three coats (inner jacket , heating jacket and the outer jacket is made of  stainless steel grade 304 or 316 , between the heating jacket and the outside is a layer of insulation made of polyethylene foam or glass wool).

– Two coats (inner jacket , heating jacket)

– One coat (inner sheath )

 

The tank may be made of stainless steel grade 304 or 316, depending on the nature of the substance .

Selecting  the appropriate heater to the temperature rise and the capacity of the mixer.

 

Time Of Pasterization

 

 

Pasteurizers capacity in [ liters ]
100 150 200 250 300 350 400 450 500 550 600
Heaters Power in [ kW ] to temperature rise by 10 0C
30 min 3,3 4,4 5,6 7,0 8,1 9,3 10,7 12,1 13,3 14,7 15,9
60 min 1,6 2,2 2,8 3,5 4,1 4,6 5,4 6,1 6,7 7,4 7,9
1 h 30 min 1,1 1,5 1,8 2,3 2,7 3,5 4,0 4,6 5,0 5,5 5,9
2 h 0,8 1,1 1,4 1,8 2,0 2,3 2,7 3,0 3,3 3,7 3,9
2 h 30 min 0,7 0,9 1,1 1,4 1,6 1,0 2,1 2,4 2,7 2,9 3,2
3 h 0,6 0,7 0,9 1,2 1,4 1,0 1,8 2,0 2,2 2,5 2,6