GEA Mechanical Equipmentengineering for a better world

Cold Milk Skimming

» For the production of raw milk cheeses no pasteurization is per-formed, so cold milk skimming is necessary to standardize the fat content.

» For the production of high quality products – i.e. low heat milk powder - cold milk skimming is applied to avoid double heat-ing.

» A significant energy saving will be achieved if double heating is avoided.

» The main markets for cold milk skimming are Australia, New Zealand, Mexico and USA.

» Typically temperatures are bet-ween 4°C and 8°C, but in general terms anything below 20°C is regarded as cold milk separation.

In some cases milk is skimmed at low temperatures

Brochure

Video

cold mIlk skImmIng

Separator MSE 140-48-177

3-D AnimAtion

Cream Pump

Rising Channel

Separating Disk

Disk Stack

Distributor Channel

Distributor

Ejection Port

Feed Bore in Spindle

Skim Pump

Bowl Top

Sediment Holding Space

Sliding Piston

Bowl Bottom

Hermetic Skimming Bowl

Bowl Flow AnimATion

Technology

» Milk viscosity higher at low temperatures, reduced separation velocity of fat globules

» Cream viscosity much higher at low temperatures, with risk of internal blockage of bowl

» Max. cream fat limited to 42%

» Cold milk skimming separators designed as hermetic machines, supply from below allows central cream discharge with big cross sections

» Cold milk skimming has higher demand of clarifying surface, equivalent machines handle smaller capacities than for hot milk skimming

» Skimming efficiency very dependent on temperature and capacity, with values of 0.08% to 0.4%

» Most milk fat fractions crystal-lized at low temperatures, fat globules much more fragile and sensitive to shearing stress

Cold milk skimming differs from hot milk separation

Technology

COMPARISON

Cold Milk SkimmingHot Milk Skimming

Key facTs

COMPARISON

Cold Milk SkimmingHot Milk Skimming

» feed from above

» discharge via double centripetal pump (static)

» hydrohermetic sealing

» feed from below

» discharge via double pumping wheel (rotating)

» mechanical seals

Key facTs

COMPARISON

MSE 500-01-777MSE 140-48-177

50.000 l/h _

45.000 l/h _

40.000 l/h _

35.000 l/h _

30.000 l/h _

25.000 l/h _

20.000 l/h _

15.000 l/h _

_ 10.000 l/h _

_ 5.000 l/h _

_ 0 l/h _

Capacity

maChine seleCtion

CapacityCold milk skimming 10,000 l/h

Process dataSolids space 5.0 lFeed pressure 6.0 barUseful discharge pressure skim milk 2.5 barUseful discharge pressure cream 0.5 bar

Energy requirementMotor rating 30 kWOil pump 0.14 kWOperating water 150 l/hCooling water 300 l/hControl air 0.02 Nm³/h

WeightsSeparator, complete 1,550 kgBowl 400 kg

Separator MSE 140-48-177Technical Data

FeaTUreS

SpeCiFiCaTiONS

MSE 140-48-177

DaTa SheeT

1 heavy phase discharge 2 Light phase discharge 3 Disk stack 4 Distributor 5 Sliding piston 6 Closing chamber 7 hollow spindle, drive 8 product feed 9 Solids holding space 10 Solids ejection port 11 Separating disk

Operating principles and constructional features

DiMeNSiONS

MSE 140-48-177

DaTa SheeT

1 heavy phase discharge 2 Light phase discharge 3 Disk stack 4 Distributor 5 Sliding piston 6 Closing chamber 7 hollow spindle, drive 8 product feed 9 Solids holding space 10 Solids ejection port 11 Separating disk

Operating principles and constructional features

DiMeNSiONS

A 1,700 mm B 850 mm C 1,455 mm D 2,600 mm

DiMeNSiONaL DraWiNg

MSE 140-48-177

MSE 500-48Throughput vs. temperature at 40% cream concentration

1.5 mm Disc Spacers

0.85 mm Disc Spacers

0.6 mm Disc Spacers

20,00013,500

0.20

0.16

0.12

0.08

0.04

0.0025,000 30,000 35,000

20,000

0.10

0.08

0.06

0.04

0.02

0.0025,000 30,000 35,000 40,000

20,000

1.5

1.2

0.9

0.6

0.3

0.025,000 30,000 35,000 40,000 45,000 50,000

4.5 ºC10.0 ºC15.0 ºC20.0 ºC

4.2 ºC7.0 ºC

15.0 ºC

10 ºC15 ºC52 ºC

EfficiEncy

GEA Mechanical Equipment / GEA Westfalia Separator

Separators from GEA Westfalia Separator for the Dairy Industry

Liquids to Value

Brochure

Dimensional Drawing