Complete 30 Mesh Acid Casein production line GEA/Westfalia CB450, Siebtechnik H-700 Conturbex

Input: 30.000 liter per hour of skim milk.

End product: 30 Mesh Acid Casein.

Basic of the line build up in 1990, several components updated in the following years.

Dismantling / pick up date: latest July 2025.

Casein is the major protein in cow’s milk and constitutes about 80% of the total protein content of which the rest, some 20%, are the whey or serum proteins. Casein is the basic component of ordinary cheese. In the cheesemaking process, casein is precipitated by the action of rennet enzyme, and a coagulum is formed consisting of casein, whey proteins, fat, lactose and the minerals of the milk.

In order to produce high-quality casein, the raw material, skimmed milk, must be of good quality. If bacteria have had time to act on the protein in the milk as a result of a change in acidity, this will affect the color and consistency of the casein, which will acquire a greyish color and a smoother consistency.

Commercial casein is made from skim milk by one of two general methods, precipitation by acid or coagulation by rennet. At this Casein production plant, Casein is produced from skim milk through acid precipitation (sulphuric acid / H2SO4) obtained by acidifying skim milk to the isoelectric point (pH 4.6 -4.7). As much of the fat, whey proteins, lactose and minerals as possible must be removed by multistage washing in water, as they reduce the quality of the casein as well as its keeping quality. Dried, properly produced casein has a relatively good keeping quality and is used mainly in the food and chemical industries.

The stored pasteurized skim milk (72°C for 15 seconds) will be pumped to the Casein plant. The skim milk will be indirect heated through a plate heat exchanger, the acid will be injected and the product will be further heated by steam injection to a temperature of 50-55 °C. After a brief period of residence in a “cooking” line, the product will be sent to an acidulation tank. The mixture of cooked casein curd and whey is gently stirred in this vat for  period of 5-10 minutes. The acidified mixture passes through a pre-screen before going to the dewhey decanter (dewhey decanter is used to reduce consumption of wash water). After catch the product into the wash tub, the product will go through a mincer and the 1st wash tubes before it arrives at the 1st Wash Screen. After 3x wash treatments (wash tubes and wash screens where the product is washed with warm water of ± 45 - 60 °C) and a mincing of the product after wash screen number 3, the chopped curd will goes into the screen worm centrifuge (Conturbex) to take out the remaining liquid before the product is sent out to the drier.

The wash water from the line goes through a fines decanter to remove the remaining solids and these solids will be added in the wash tub of the dewhey decanter and will follow the same process as the final product for the de-whey decanter.

The product will first pass a hot air pre-drier (50-55°C) and finally will be finalized after the hot air main drier (± 65°C) until the water content is 12% and the product is ground to a powder; 30 Mesh Acid Casein.

The storage bins for the final product are too big for dismantling / transport so they are excluded in this quotation as well as the final filling station.

The Complete Casein production line existing out of:

1.        Feed pump from the skim milk from the skim milk tank to the Casein production plant.

Manufacturer: Alfa Laval

Type: SRU6/260/LS

Serial number: 435909

Motor: 11 kW – 380 / 420 V – 22 A – 50 Hz – 1475 rpm

               Pump speed: i: 3,09 – n2: 477 rpm

Including 2x Alfa Laval MR self-priming CIP return pumps.

2.        Acid preparation set by using 10% sulphuric acid / H2SO4 for an end product of Dilute Sulphuric Acid, set mounted in a drip tray.

-            HDPE Tank for 10% sulphuric acid / H2SO4

Volume: 1.000 liter

Manufacturer: APD Ltd, Auckland

Year: 2008

Design standard: BS EN 12573

Design pressure: Atmospheric

Design temperature: 40°C

Design life: 25 year

-            2x Magnet Pumps

Manufacturer: Iwaki

Model: MDM 25-2103ECFF075A-D2

Head: 61 m

Capacity: 100 ltr/min

Motor: 7,5 kW – 50 Hz

-            Dilute acid makeup water supply pump

Manufacturer: APV

Model: W30/20

Motor: 2,2 kW – 50 Hz – 380/415 V

-            Level tank with filter.

-            All interconnecting piping (usually plastic) and valves.

-            Stainless Steel Control panel with 2x Rosemount Analytical 1056 display, 1x Rosemount 54e display, emergency stop, motor groups, flow transmitter controls, Delta Electronics GES102N2000035 and cabling.

3.        Wash water set.

-            2x plastic tanks of ± 5.000 ltr with drain and level transmitters.

-            Wash water recycle pump, 27PUO004 – CCT228

Manufacturer: Fristam

Type: FP 722 KFC

Serial number: 0424470447

Motor: 5,5 kW – 2.935 rpm – 400 V – 50 Hz – 10,3 A

-            Centrifugal pump, 27PU0203

Manufacturer: APV

Type: W30/25

Serial number: 177

-            Line 1 Fresh water supply pump, 27PUO103 – CCT230A – L1FWS

Manufacturer: APV

Type: W30/25

Serial number: 178

-            Wash Water Acid Isolation set with control valve and flowmeters.

-            Stainless steel control panel with read out and controls.

4.        Injection of Acid + cooking system.

-            Skim milk heating in a plate heatexchanger with indirect hotwater (made in another plate heatexchanger water – steam transfer).

Water – Steam PHE: Alfa Laval, T6-SR, 30108-44768, 2015, 1 section, 0/8 bar, 0/135°C

Hotwater – Product PHE: Tetra Pak, MS10-KSR, 2015, 1 section, 10 bar, 120°C

Including pre-heat condensate circ pump (4 kW – 1450 rpm) and piping.

-            Dilute Sulphuric Acid injection in the skim milk.

-            Steam injection nozzle for heating up the skim milk.

5.        Acidulation vat.

Manufacturer: National Dairy Assn. of N.Z. Ltd. ( rebrands to Tira, https://www.tiragroup.co.nz )

On top screen for the returning CBX Curd effluent, 3x man holes for inspection.

Spray balls for cleaning.

Agitator over the full length of the vat which rotated in the vat driven by 1x motor (3,0 kW – 400 V – 50 Hz – n1: 1.440 rpm – i:  57,13 - n2: 25 rpm) with chain transmission.

Level transmitter which controls the pre-screen feed pump.

6.        Pre-Screen feed pump.

Manufacturer: IBEX

Type: MOG 3040

7.        Pre-Screen with whey tank

Manufacturer: National Dairy Assn. of N.Z. Ltd. ( rebrands to Tira, https://www.tiragroup.co.nz )

Filter screen

CIP cleanable

Including lobe feed pump to Decanter (Alfa Laval SRU6/260/LS, serialnr 432410A, 11 kW) and centrifugal whey pump.

8.        De-Whey Decanter

Manufacturer: GEA Westfalia

Type: CB 450-01-30

Year: 2004

Serial number: 8003-587

Max bowl speed: 3.000 rpm

Dia. In mm: 458/245

Solids kg/dm3: 2,0

Min/Max Temperature feed product: 5 – 80 °C

Motor: 380/420V – 45 kW – 2.965 rpm – 50 Hz

Tools for maintenance available.

Excluding the drum / bowl of this decanter!!!

9.        Fines Decanter

Manufacturer: GEA Westfalia

Type: CA 365-01-00

Reconditioned year: 2004

Serial number: 1666-179

Max bowl speed: 4.000 rpm

Dia. In mm: 365/265

Min/Max Temperature feed product: 5 – 100 °C

Motor: 380/420V – 30 kW – 2.945 rpm – 50 Hz

Tools for maintenance available.

10.   Wash Tub

Open tub, to collect the casein from the Decanters and sent it by a product lobe pump (Alfa Laval SRU6/260/LS, serial number: 432410C, motor 11 kW) to the next washing stages.

11.   Mincer

Manufacturer: Engineering Services

Motor: 400 V - 7,5 kW – 1.450 rpm – 50 Hz

12.   First wash tubes

4x Stainless steel tubes, hanging in a frame.

13.   Wash screen 01

Manufacturer: National Dairy Assn. of N.Z. Ltd. ( rebrands to Tira, https://www.tiragroup.co.nz )

Filter screen

CIP cleanable

Including lobe feed pump to next stage (Ibex MOG3040, serialnr 16477, 11 kW) and centrifugal screen 1 return pump.

14.   Second wash tubes

4x Stainless steel tubes, hanging in a frame.

15.   Wash screen 02

Manufacturer: National Dairy Assn. of N.Z. Ltd. ( rebrands to Tira, https://www.tiragroup.co.nz )

Filter screen

CIP cleanable

Including lobe feed pump to next stage (Alfa Laval SRU6/260/LS, serialnr 432410B, 11 kW) and centrifugal screen 2 return pump.

16.   Third wash tubes

3x Stainless steel tubes, hanging in a frame.

17.   Wash screen 03

Manufacturer: National Dairy Assn. of N.Z. Ltd. ( rebrands to Tira, https://www.tiragroup.co.nz )

Filter screen

CIP cleanable

Agitator at the bottom of the tank

Including lobe feed pump to next stage (Ibex MOG3040, serialnr 16467, 11 kW), centrifugal screen 3 return pump and curd mincer (Engineering Services, Motor: 400 V - 7,5 kW – 1.450 rpm – 50 Hz).

18.   Fourth wash tubes

2x Stainless steel tubes, hanging in a frame.

19.   Wash screen 04

Manufacturer: National Dairy Assn. of N.Z. Ltd. ( rebrands to Tira, https://www.tiragroup.co.nz )

Filter screen

CIP cleanable

Agitator at the bottom of the tank

Including lobe feed pump to the CBX (Pureflo lobe, serialnr C2-3873) and screen 4 return lobe pump (Pureflo lobe Jabsco model 24250-4310, serialnr 10257).

20.   Wash water preparation set.

Plate heatexchanger (Tetra Pak, 4-sections, CW8-KSR, 2008, serialnr 30106-34338, 190 liter, 0-6 bar, 0-120°C).

Centrifugal pump, APV, 2-3-9, serialnr U7607M

Flowplate for manual selection between Casein / Curd process.

21.   Worm Screen Centrifuge (to take out the remaining liquid before the product is sent out to the drier)

Manufacturer: Siebtechnik GmbH / Tema B.V.

Model: Conturbex H-700

Serial number: 4270

Year: 1990

Basket diameter: 700 mm

Material of basket: 1.4581

Max speed: 1.500 rpm

At density: 1,2 kg/dm3

Oil filling: 50 liters

Motor: : 400 V - 45 kW – 1.475 rpm – 50 Hz

The CONTURBEX is a continuously operating filtration centrifuge and it achieves his flexibility by means of a centrifuge scroll driven at a differential speed. The unique functional principle of pre-accelerated suspension feed to the screening device, combined with homogeneous distribution by means of the worm, enables this centrifuge to perform complex tasks. We achieve optimum dewatering results by adapting the machine parameters, G force and dwell time. The solid material is conveyed by means of a worm rotating at a different speed from the bowl. Solid and liquid are conducted away into separate housing sections. Mother liquor and washing liquid can be drained away separately from each other. The drive for the SIEBTECHNIK screen worm centrifuge stands out for its powerful gear units and a high-quality bearing support. A central oil-circuit lubrication system supplies all the bearings with continuously filtered and temperature-controlled lubricant. This machine concept enables excellent access to all the components coming into contact with the product. The result is fast servicing and maintenance procedures and special cleaning requirements to be met inside the process space. Video of the working principle of this Conturbex: https://www.youtube.com/watch?v=OPN8q_KJLDc

Including rotary valve to sent the product to the pre-drier, CBX tank and CBX return pump (Pureflo lobe Jabsco, 24250-4310, serialnr: 10256)

22.   Pre-Drier

Manufacturer: National Dairy Assn. of N.Z. Ltd. ( rebrands to Tira, https://www.tiragroup.co.nz )

2 layers

Including cyclones, rotary valves (GEA Nu-Con), exhaust, blowers and outfeed to the main drier.

23.   Main Drier

Manufacturer: National Dairy Assn. of N.Z. Ltd. ( rebrands to Tira, https://www.tiragroup.co.nz )

4 layers

Including cyclones, rotary valves (GEA Nu-Con) exhaust, blowers and outfeed to the buffer / product Bins.

24.   Electrical cabling and MCC control panels.

25.   All interconnecting piping, flowmeters and valves.

26.   All available manuals, flowschemes and other information.

Videos of the complete line are available on request.

Excluding: PLC / Scade programs, Visuals on computer, Drum/Bowl of the De-Whey Decanter, Transport, Import, Reconditioning, Installation or startup.

Dismantling, loading and strapping in containers will be done by the Supplier.

Dismantling date: latest July 2025.

A supervisor (or dismantling team) from the Buyer can be present on site during the dismantling.

Transport (containers), has to be arranged and paid for by the Buyer. Date and time on request of the Supplier.