Results 1 to 5 of 5

Thread: Mass Flow Hoppers for Pharmaceuticals

  1. #1
    Join Date
    Nov 02
    Posts
    2

    Mass flow hoppers in pharmaceuticals

    I want to know what type of hoppers are used in pharmaceutical industry ? Is is mass flow or core flow?

  2. Bearing in mind the major importance of blend homogeneity and the ramifications for product quality if segregation or flow problems occur, the answer to your question should be - mass flow. However, in practice this is not necesarily the case (whether by lack of accepted design procedures for flow, or by ignorance of basic flow behaviour when specifying equipment). It is not unusual to find far more attention being paid to the quality of external finishes on vessels and handling equipment than to that at the bounding flow surface (which is where it actually counts!).

    The widespread misunderstanding of flow properties and discharge behaviour is manifested as poor plant performance and unnecesaarily high reject levels in a large number of production facilities.

    Richard Farnish
    Consulting Engineer

    The Wolfson Centre for Bulk Solids Handling Technology, University of Greenwich, London

    http://www.bulksolids.com

  3. Selection of Mass Flow

    There are two main criteria for selecting Mass Flow as a flow regime in a bulk storage container. The first is to guarantee that there are no 'dead' pockets of storage where the material may deteriorate in flow property or quality in some way. It is Not usually chosen for this reason if the process entails a total batch discharge of all the contents, for example. This mode of discharge is frequently quoted as a way to redress segregation but it is not a complete answer, and some experience and special techniques are apprproriate in sensitive cases.

    The other reason is to secure the flow benefits of mass flow with regard to the size of orifice needed to guarantee reliable flow. In such cases, an 'expanded flow' form of geometry may be the most efficient shape. This is one where the section adjacent to the outlet has mass flow characterisitics, but at a cross section that is greater than the 'critical rathole' diameter, the construction may convert to a non-mass flow form.

    Also to be taken into account for optimum performance of bins and hoppers are the alternate forms of construction. For example, pyramid shapes have terrible characteristics for total wall slip, mass flow, cleaning and contamination and the like, so these are rarely used in quality pharmaceutical applications. Cones are widely used, in spite of their relatively poor flow characteristics. Vee shaped are better, but conventionally require a feeder to serice a slot outlet. More sophisiticated shapes are available that overcome these drawbacks, but cost more to fabricate. Overall, expert advice is useful to optimise selection, as no one shape fits all duties. Advice is free from tech@ajax.co.uk and some technical publications will help you to steer clear of many common problems and hazards.

    Lyn Bates

  4. Mass flow hoppers for pharmaceuticals

    The pharmaceutical hoppers are mostly small. For such hoppers the usual hopper design don’t work. Therefore the IPT have develop so called ideal flow silos – the silos without the cone where the diameter of the discharge equipment is equal to the silo diameter. Such – ideal flow silos – are suitable for storage of free flowing and cohesive powders. This means that the same design can be used for all available powders and it is not necessary to design the powder for each material separately. Contact us for more information.


    PLEASE VISIT OUR WEBSITE AND CONTACT US FOR FURTHER DEVELOPMENT OF A COOPERATION. WWW.IPT-ONLINE.COM.


    Best regards
    IPT
    Dr. Ivan Peschl

  5. #5
    Lawrence K. Nordell

    Lawrence K. Nordell

    President and CEO

    Conveyor Dynamics Inc.

    Conveyor Dynamics Inc.

    Professional Experience 59 Years / 11 Month Lawrence K. Nordell has 59 Years and 11 Month professional experience

    Discussions 304 Lawrence K. Nordell acceded to 304 discussions, Publications 0 Lawrence K. Nordell Nordell released 0 publications

    Know-How Design (1524) Lawrence K. Nordell used this tag 1524 times, Pipe Conveyor (239) Lawrence K. Nordell used this tag 239 times, Chutes (119) Lawrence K. Nordell used this tag 119 times

    Simulate Pill Flow in Hoppers

    Dear PEP,

    True flow similation can be performed using Discrete Element Modeling (DEM). Visit our website for an introduction. Virtually any shape can be modelled with surface degradation, mixing behavior, core flow, mass flow or other derivatives that may occur.

    Lawrence Nordell
    COnveyor Dynamics, Inc.
    www.conveyor-dynamics.com

Similar Threads

  1. AJAX Top Tips: Achieving Reliable Flow 1 - Mass Flow
    By Author in forum Whitepapers / Technical Articles / Guidelines
    Replies: 0
    Last Post: 22nd August 2014, 17:38
  2. Mass Flow or Funnel Flow?
    By mahmud in forum Ask Lyn Forum
    Replies: 3
    Last Post: 13th November 2007, 15:41
  3. Mass Flow Feeder
    By Author in forum New Products, New Orders
    Replies: 0
    Last Post: 26th January 2007, 18:43
  4. Mass Flow Feeder
    By Takaharu Sakata in forum New Products, New Orders
    Replies: 0
    Last Post: 12th August 2003, 3:41
  5. How To Detect Mass Flow in Existing Bins/Hoppers ?
    By jack_archer in forum Ask Lyn Forum
    Replies: 1
    Last Post: 20th May 2003, 12:41

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Single Sign On provided by vBSSO