282446864-High-Shear-Mixing (2)

8/18/2019 282446864-High-Shear-Mixing (2)

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HIGH SHEAR MIXING

Mesin ini dirancang untuk mengurangi ukuran partikel dan mencampur.

Metode pencampuran ini memiliki efisiensi yang lebih baik daripada metode

pencampuran lain. Kecepatan putaran mesin ini 3000-15000 rpm.

High shear adalah suatu metode pengadukan, dimana cairan dengan

kekentalan rendah (biasanya air ditambahkan ke dalam campuran serbuk yang

telah mengandung pengikat yang kemudian dicampur dengan sisa bahan dalam

formulasi. !amun, penggunaan high shear mixing pada kondisi tertentu dapat

digunakan untuk membantu serbuk yang mempunyai karakteristik khusus"sulit

tercampur terdispersi ke dalam cairan.

Gambar 1. #ambar High Shear Mixer

(Sumber : Anonim, 2007)

Mekanisme pencampuran yang dihasilkan oleh high shear mixing hampir

sama dengan vortex. $ntuk gambaran lebih %elasnya mengenai pusaran atau gerak

yang dihasilkan oleh high shear mixer (&'M yaitu seperti pada gambar .


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Gambar 2. )rah pusaran yang dihasilkan oleh &'M


Komponen utama yang menyusun alat high shear mixer tersebut yaitu

sebuah rotor yang berputar dengan kecepatan tinggi dan sebuah komponen

stasioner yang disebut %uga dengan istilah stator. *aktor utama dari desainmeliputi diameter rotor dan kecepatan rotasi, %umlah baris gigi, sudut dan lebar

bukaan antar gigi pada rotor, %arak antara rotor dan stator serta %umlah generator.

)lat ini membutuhkan tenaga listrik dalam pengoperasiannya.

Gambar 3. Macam-macam bentuk u%ung kepala &'M (rotor dan stator



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Gambar 4. Inline SLIM


High shear Mixer menyebar, atau mengangkut, salah satu fase atau bahan

(cair, padat, gas men%adi fase utama kontinyu (cair, dengan yang biasanya akan

bercampur. 'ebuah high shear mixer dapat digunakan untuk membuat emulsi,

suspensi, lyosols (gas tersebar dalam cairan, dan produk granular. &al ini

digunakan dalam perekat, kimia, kosmetik, makanan, farmasi, dan industri plastik

untuk emulsifikasi, homogenisasi, pengurangan ukuran partikel, dan dispersi.

+rinsip ker%a dari high shear mixing yaitu cairan mengalami pergeseran

ketika salah satu daerah cairan bergerak dengan kecepatan relatif yang berbeda

untuk daerah yang berdekatan.

*aktor desain utama meliputi yaitu diameter rotor dan kecepatan rotasi

yang dimilikinya, %arak antara rotor dan stator, aktu dalam mixer , dan %umlah

generator dalam seri. ariabel meliputi %umlah baris gigi, sudut mereka, dan lebar

bukaan antara giginya. Kegunaan dan aplikasi mixing ditentukan oleh fase yang

akan dicampurkan (cair-cair, padat-cair, atau padat-padat sebagaimana

karakteristik fisik dari produk akhir seperti iskositas dan densitas.

DAFTAR PUSTAKA

)nonim. 00/. Mixing Technologies in the harmaceutical an! Me!icinal

In!ustries. $') harles 2oss and 'on ompany

hatt, hana and )graal, '.' . 00/. harmaceutical "ngineering # Mixing$

%elhi Institute o& harmaceutical Science an! 'esearch Sector # ( . !e

4elhi +ushp ihar


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High-shear mixer

) high-shar mi!r disperses, or transports, one phase or ingredient (liuid,

solid, gas into a main continuous phase (liuid, ith hich it ould normally

be immiscible. ) rotor or impeller, together ith a stationary component knon as a

stator, or an array of rotors and stators, is used either in a tank containing the solution to

be mi6ed, or in a pipe through hich the solution passes, to create shear . ) high-shear

mi6er can be used to create emulsions, suspensions, lyosols (gas dispersed in liuid, and

granular products. 7t is used in the adhesies, chemical, cosmetic, food, pharmaceutical,

and plastics industries for emulsification, homogeni8ation, particle si8e reduction, and

dispersion

Pri"#i$%s &' (&r)

*luid undergoes shear hen one area of fluid traels ith a different elocity

relatie to an ad%acent area. ) high-shear mi6er uses a rotating impeller or high-

speed rotor, or a series of such impellers or inline rotors, usually poered by an

electric motor, to 9ork9 the fluid, creating flo and shear. :he tip elocity, or

speed of the fluid at the outside diameter of the rotor, ill be higher than the

elocity at the center of the rotor, and it is this elocity difference that creates

shear.

) stationary component may be used in combination ith the rotor, and is referred

to as the stator. :he stator creates a close-clearance gap beteen the rotor and

itself and forms an e6tremely high-shear 8one for the material as it e6its the rotor.

:he rotor and stator combined together are often referred to as the mi6ing head, or

generator. ) large high-shear rotor;stator mi6er may contain a number of

generators.

Key design factors include the diameter of the rotor and its rotational speed, thedistance beteen the rotor and the stator, the time in the mi6er, and the number of

generators in the series. ariables include the number of ros of teeth, their angle,

and the idth of the openings beteen teeth.

Batch high-shear mixers

7n a batch high-shear mi6er, the components to be mi6ed (hether immiscibleliuids or poder in liuid are fed from the top into a mi6ing tank containing the

mi6er on a rotating shaft at the bottom of the tank. ) batch high-shear mi6er can

process a gien olume of material appro6imately tice as fast as an inline rotor;

https://en.wikipedia.org/wiki/Immisciblehttps://en.wikipedia.org/wiki/Immisciblehttps://en.wikipedia.org/wiki/Immisciblehttps://en.wikipedia.org/wiki/Shearing_(physics)https://en.wikipedia.org/wiki/Emulsionhttps://en.wikipedia.org/wiki/Emulsionhttps://en.wikipedia.org/wiki/Emulsionhttps://en.wikipedia.org/wiki/Suspension_(chemistry)https://en.wikipedia.org/wiki/Suspension_(chemistry)https://en.wikipedia.org/w/index.php?title=Lyosol&action=edit&redlink=1https://en.wikipedia.org/wiki/Homogenization_(chemistry)https://en.wikipedia.org/wiki/Shearing_(physics)https://en.wikipedia.org/wiki/Emulsionhttps://en.wikipedia.org/wiki/Suspension_(chemistry)https://en.wikipedia.org/w/index.php?title=Lyosol&action=edit&redlink=1https://en.wikipedia.org/wiki/Homogenization_(chemistry)https://en.wikipedia.org/wiki/Immiscible


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stator mi6er of the same poer rating< such mi6ers continue to be used here

faster processing by olume is the ma%or reuirement, and space is not limited.=>? @hen mi6ing sticky solutions, some of the product may be left in the tank,

necessitating cleaning. &oeer, there are designs of batch high-shear mi6ers that

clean the tank as part of the operating run. 'ome high-shear mi6ers are designed

to run dry, limiting the amount of cleaning needed in the tank.

Inline high-shear mixers

7n an inline high-shear rotor;stator mi6er, the rotor;stator array is contained in a

housing ith an inlet at one end and an outlet at the other, and the rotor drien

through a seal. :he components to be mi6ed are dran through the generator

array in a continuous stream, ith the hole acting as a centrifugal pumping

deice. 7nline high-shear mi6ers offer a more controlled mi6ing enironment, take

up less space, and can be used as part of a continuous process. Auilibrium mi6ing

can be achieed by passing the product through the inline high-shear mi6er more

than once.

Inline powder induction

)n inline rotor;stator mi6er euipped for poder induction offers fle6ibility,

capability, and portability to sere multiple mi6 essels of irtually any si8e. 7ts

straightforard operation and conenience further ma6imi8e euipment utility

hile simplifying material handling.

@hen used ith a acuum pump and hopper, an inline shear mi6er can be a ery

effectie ay to incorporate poders into liuid streams. Btherise knon as

high-shear poder inductors, these systems hae the adantage of keeping the process on the floor leel instead of orking ith heay bags on me88anines.

&igh-shear poder induction systems also offer easy interchangeability ith

multiple tanks.

High-shear granulators

) high-shear granulator is a process array consisting of an inline or batch high-

shear mi6er and a fluid-bed dryer. 7n a granulation process, only the solid

component of the mi6ture is reuired. *luid is used only as an aid to processing.

:he high-shear mi6er processes the solid material don to the desired particle

https://en.wikipedia.org/wiki/High-shear_mixer#cite_note-ArtofHSM-4https://en.wikipedia.org/wiki/High-shear_mixer#cite_note-ArtofHSM-4


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si8e, and the mi6ture is then pumped to the drying bed here the fluid is remoed,

leaing behind the granular product.

Ultra-high-shear inline mixers

7n an ultra-high-shear inline mi6er, the high-shear mi6ing takes place in a single

or multiple passes through a rotor;stator array. :he mi6er is designed to sub%ect

the product to higher shear and a larger number of shearing eents than a standard

inline rotor;stator mi6er, producing an e6ceptionally narro particle-si8e

distribution. 'ub-micrometre particle si8es are possible using the ultra-high-shear

technology. :o achiee this, the machine is euipped ith stators ith precision-

machined holes or slots through hich the product is forced by the rotors. :he

rotor;stator array can also include a mechanism hereby the momentum of the

flo is changed (for e6ample by forcing it sideays through the stator, alloing

for more processing in a single pass.

E*+i%ibri+m mi!i"g

&igh-shear mi6ers are used in industry to produce standard mi6tures of

ingredients that do not naturally mi6. @hen the total fluid is composed of to or

more liuids, the final result is an emulsion


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• +aper manufacture, bleaching and preparation of paper pulp

• *ood preparation, emulsions for condiments, sauces and dressings

• Manufacture of cosmetics
https://en.wikipedia.org/wiki/Paperhttps://en.wikipedia.org/wiki/Cosmeticshttps://en.wikipedia.org/wiki/Cosmeticshttps://en.wikipedia.org/wiki/Paperhttps://en.wikipedia.org/wiki/Cosmetics

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282446864-High-Shear-Mixing (2)