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Pulverizing of Cacao with the Universal Mill, type PX

Pulverizing of Cacao with an Air Cooled Grinding System

Powders for instant chocolate drinks can be produced from pre-crushed cacao press cake using an Universal mill type PX 315. The cacao press cake usually has a fat content of approx. 12 percent and gets pre-crushed into pieces having a size of approx. 12 mm and smaller (1/2 inch). The material is very heat sensitive and thus for pulverizing a system using chilled air is needed. The system can produce a cacao powder with a particle size 90 percent minus 74 m (200 mesh). The throughput capacity is approx. 200 kg/h.

Method of Operation

Material is metered into the Universal mill by means of a vibratory feeder. Process air, going into the mill and used for air conveying of the material, is chilled in a heat exchanger using cold water. Size reduction of the material takes place inside the grinding chamber by impact of the material against the pins of a rotating and a stationary pin disc.

Pulverized material is discharged into a pick-up pan and air conveyed into a cyclone separator. Material and air are separated in the cyclone. Fine powder is discharged through a rotary airlock installed at the outlet of the cyclone. The air from the cyclone separator passes through a filter. Super fine material is discharged through the rotary airlock underneath the filter. The whole system is operated under negative pressure created by a blower; this ensures a clean operation of the system. Air is circulated, cooled in the heat exchanger and then used in the process again.

Closed loop pulverizing system with Universal mill, cyclone, filter and heat exchanger.

Advantages & Features

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Chilled air allows heat sensitive materials to be pulverized

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Closed loop system provides dry grinding conditions

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Good access to the grinding chamber for easy cleaning

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Pipes supplied with fast disconnects for easy cleaning

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Rotary airlocks in "quick clean design" with pull-out rotor

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Pick-up pan with cleanout door provides good access for cleaning

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Electric panel to control all system functions

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Safety switches for maximum operator protection

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Casted design, rugged and reliable in operation

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Compact space saving design

  1   Feed hopper

  2   Vibratory feeder

  3   Infeed chute

  4   Universal mill

  5   Main drive motor

  6   Drive guard

  7   Pick-up pan

  8   Machine stand

Technical Specifications

Type

PX

250

315

500

630 1000

Scale up Factor

f

0.5

1.0

2.4

4.0 8.6

Rotor Diameter

mm

250

315

500

630 1000

Rotor Speed, max

rpm

8800

7000

4600

3500 2300

Rotor Speed,min

rpm

6250

5000

3280

2470

1550

Motor

kW

5.5-11 11-18.5 30-45 55-75 110-160

Throughput rate *

kg/h

50-250

100-500

250-1200

400-2000 800-4300

* Throughput Rate  may vary depending of the feed material

 

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2009 PALLMANN Industries, Inc.
PALLMANN Industries, Inc.
36 Atlantic Way, Clifton, New Jersey 07012 - USA
Phone: (973) 471-1450 - Fax: (973) 471-7152
Email: info@PallmannIndustries.com