Jet Mills, Fluidised Bed Opposed Jet Mills Fluidised Bed Opposed Jet Mills are Jet Mills for manufacturing powders with a steep par-ticle size distribution and sharp top size limitation

The Fluidised Bed Opposed Jet Mills are Jet Mills for manufacturing powders with a steep par-

ticle size distribution and sharp top size limitation in the range of 1 µm to 120 µm (microns). The

grinding is performed by using specially prepared and purified compressed air or inert gas. As a

special service we also offer the inert micronization in encapsulated form. The plants are suitable

for pressure-shock resistant milling up to 10 bar (overpressure).

Jet Mills, Fluidised Bed Opposed Jet Mills(100 AFG, 200 AFG, 400 AFG)

Jet mills for abrasion-free and contamination-free grinding

With our Fluidized Bed Opposed Jet Mills we can realize abrasion-free

and contamination-free micronization.

At ACU all product contacted parts are made of rust resistant and

acid resistant stainless steel.

Plant Technology

© 2014 ACU PHARMA und CHEMIE GmbH, DE-99510 Apolda, all rights reserved Version 2, Issue date: 19.12.2014

The milling on the AFGs is character-ized by the following features

With Fluidised Bed Opposed Jet Mills grit-free final products with steep particle size distribution can be produced.

The integrated Turboplex Classifier allows extreme selectivity.

Grinding finenesses between d97 = 2 µm up to 120 µm (microns) can be produced.

ACU usually processes products up to Mohs’ hardness 7, which needs to be proven in each individual case.

The 200 AFG and 400 AFG are suitable for the milling of dust-explosive materials (St 0-2).

Upon special request a silicone-free micronization (400 AFG) is feasible.

Only air but no material is directed through the grinding nozzles. Along with the size reduction in the fluidized bed this significantly leads to a wear-free grinding.

In addition monobloc ceramic classifying wheels (400 AFG) reduce wear when processing abrasive products.

The ACU Jet Mills are particularly well suited for grinding temperature-sensitive products. A heat-ing of the product is safely ruled out. This is a fundamental difference of the Jet Mills compared to conventional mechanical grinders with increase of temperature.

The major production plants at ACU are explosion-pressure-shock resistant to 10 bar (overpressure) with type test certificate as defined in 94/9/EC.

The 200 AFG is manufactured in pharmaceutical design.

The AFGs are easy and reliable to clean and thus offer a high product quality.

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Plant Technology


Benefits that arise from inertisation

ACU can grind temperature-sensitive products additionally under inert gas.

Inerting benefits a product-gentle grinding.

A high bio-availability of food additives is favoured, inter alia, by inerting during fine grind-ing.

Application areas

The following product groups can be milled on our AFGs:

Ideal suitability for calcium citrate

Nutritional supplements

Food additives

Heat-sensitive materials, such as varnishes, resins, waxes, teflon powder, ion exchangers (Amberlite), etc.

High-purity substances which have to be milled contamination-free, e.g. silica gels, citrates, carbonates, chlorides, etc.

Mineral resources such as kaolin, talcum, etc.

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ACU is your partner from product development to product maturity and continuous production

In our capacity as a laboratory and development

center we help to realize the development of your

new product, taking into account your wishes and

requirements. We can manufacture small trial product

samples for testing purposes and development trials

as well as products to their final product maturity. We

offer the possibility of a reproducibility of the pro-

cesses and the ability to scale-up to a production

plant used for the continuous production.

ACU is an efficient service provider who supports you from

the development of a new product to the product maturity

and the final market introduction, and after that we manu-

facture the marketable product on a permanent basis.

In the processing of explosive products the laboratory plant

is rendered inert with nitrogen.

Plant Technology


100 AFG 200 AFG 400 AFG

Mill

The mill is made of full material (monoblock design), without

welding seams, and most widely free of clearance volume and

gaps.

Classifier stainless steel stainless steel or monoblock ceramic

Classifier head (Single-wheel

classifier head)Turboplex classifier head made of stainless steel

Explosion-pressure-shock-proof

Yes, by means of inertisation Yes, up to 10 bar (overpressure)

Minimum quantity starting from 1 kg for testing purposes starting from 50 kg starting from 1.000 kg

Design standard pharmaceutical standard

Clean room The plant is placed in a clean room and has a separate material lock and personnel lock.

Nozzles Various nozzles and various arrangements of the nozzles depending on the requirement

Inertisation is possible yes yes no

Technical Data

ACU PHARMA und CHEMIE GmbH

Am tiefen Graben 6

DE-99510 Apolda

Phone: +49 (3644) 5058-0

Fax: +49 (3644) 5058-99

Web: www.acu-pharma.com

e-mail: [email protected]

CONTACT:


(1) Dosage with reservoir

(2) Rotary airlock valves (product entry into the mill, product discharge at the filter)

(3) Turboplex classifier wheel

(4) Mill housing (grinding chamber)

(5) Fines discharge

(6) Nozzles

(7) Supply line for nozzles

(8) Fan

(9) Discharge of the finished product; the container of the finished product is docked there

(10) Filter with filter cleaning

Principle of operation

Very fine particle sizes can be achieved on an AFG

in conjunction with the Turboplex Air Classifier. The

special feature of the Fluidized Bed Opposed Jet Mill is

that too coarse particles are rejected by the classifier

and get back into the fluidized bed along the wall of

the mill. This process is repeated until the particles

have the desired fineness.

In a Fluidized Bed Opposed Jet Mill two effects come to

bear to the entire crushing effect: the crushing in the

single beam and the crushing in the counter beam.

The crushing in the single beam is characterized

by the fact that two particles that have occurred at

different locations in this air jet have different speeds,

due to the different length of the acceleration distance

they have traveled. The direction of their velocity is

the same. This mechanism acts during the entire

beam length from the nozzle outlet to the nozzle

focal point. If two of such particles hit each other, in

the case of a sufficiently large speed difference, a

comminution will take place.

The comminution in the counter rotating beam differs

from the crushing in a single beam by the fact that it is

effective only around the focal point. In this case, the

particles have a velocity component directed towards

one another whereby the impact velocities are rather

larger than in the comminution in a single beam.

Plant Technology


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Jet Mills, Fluidised Bed Opposed Jet Mills Fluidised Bed Opposed Jet Mills are Jet Mills for manufacturing powders with a steep par-ticle size distribution and sharp top size limitation