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Ultra-Fine Grinding

 

Pulverizing of Spices with the Contra Selector Mill, type PPS & PPSR

Pulverizing of oily, fatty, sticky and moist materials

The self cleaning screen type Contra-Selector is preferred for the pulverizing of greasy, sticky and moist products.  Thus, materials like press cakes, cellulose ether or spices, can be processed to fine powders under ambient conditions.

This system is also suitable for grinding and drying in a single step operation.

Method of Operation

Material must be metered into the machine. Inside the grinding chamber an impeller accelerates the material and throws it against a rotating screen basket. Due to high impact and sheering forces created by the differential speed between impeller and screen basket the material is reduced in size.

The main feature of the Contra Selector Mill is the rotating screen basket. When rotating, centrifugal forces keep the screen free from clogging. Due to the rotation the total screen area is engaged in the grinding process.

Particle size of the end product can be adjusted in a very wide range by changing the speeds of the impeller and screen basket, by the screen size and the number and shape of grinding elements installed.

A rotating scraper keeps the inside of the machine housing free from any sticking material. For special applications the machine housing can be water-cooled or steam jacketed.

Type PPS Type PPSR

Advantages & Features

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One pass size reduction step produces the desired final particle size

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No loss of aroma due to pre-grinding

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Cool grinding operation; no artificial coolants are required

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Continuous operation, no clogging or screen blinding

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Self cleaning design; scrapers keep inside of machine housing clean

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Easy adjustment of particle size

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Hinged front door allows quick access to the grinding chamber

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Screen basket and impeller can be easily removed from the front

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Water or steam jackets available for special applications

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Stainless Steel and gas tight designs available

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Pressure shock resistant design available up to 10 bar

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Safety switches for maximum operator safety

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Steel fabricated design, rugged and reliable

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Compact space saving design

1. Material feeding

2. Contra-Selector Mill, PPS

3. Motor, screen basket

4. Motor, impeller

5. Discharge funnel

6. Rotary air lock

7. Filter

8. Ventilator

Technical Specifications

Spices

Capacity*

kg/h

d*50

m

d*97

m

Anise

120

200

600

Coriander

450

200

700

Caraway

1200

200

1000

Nutmeg

990

250

1000

Nutmeg flower

1100

250

900

Cloves

310

200

800

Paprika

150

100

400

White pepper

1200

100

1250

*Reference to PPS 6-180

Type

PPS

4-120

6-180

8-240

10-300

12-360

14-420

Scale-up Factor

f

0.4

1.0 1.7 2.7 4.0 5.2

Rotor Diameter

mm

400

600 800 1000 1200 1400

Width of screen

mm

120

180 240 300 360 420
Motor, Impeller kW 15-22 30-55 55-110 110-160 160-250 200-315
Motor, Screen kW 7.5-11 15-30 30-55 55-90 90-132 110-160
Machine Weight kg 1750 3300 5250 7650 9750 11500

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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