Littleford Day Frequently Asked Questions

What qualifies the requirement to test my application on the Littleford Day process equipment?
Unless your application is a simple dry-powder mixing operation, in which previous experience will tell us batch times and final product quality, it is generally suggested to perform either in-plant or lab tests to optimize the process and establish the right specifications for production equipment.

Can we set-up a fast preliminary test to check equipment feasibility?
If your application is a mixing and/or drying operation, we can probably run a preliminary feasibility test with only 5 liters of product.  For proper scale-up, we usually require an additional test trial with 90 liter batches.  For paste dispersions, reactions or other applications, the amount of material required for testing will vary.

Is it possible to perform testing at my plant?
We have a wide array of rental units in which to run your own in-plant tests, market-tests or production requirements.

I am concerned about confidentiality?
We sign Confidentiality Agreements to ensure the secrecy of your process and application.

Why not settle for a simple mixing device?
Low speed mixers, such as ribbon blenders are recommended for simple mixing of materials with similar densities. These types of mixing devices are not efficient for mixing products with different densities, dispersing liquids into powders or for conductng heat-exchange operations.

I need to mix powders with various densities: from very light to very heavy. What equipment should I use?
Either our "mechanically-fluidized-bed" Horizontal Ploughshare® Mixer or the Day Nauta Processor Mixer, depending on your product and your production requirements.

When mixing, I get some undesirable lumps due to moisture in my product. What is the best way to eliminate them?
For de-agglomerating lumps we use the high-speed choppers of our Ploughshare®  mixers, designed to prevent lumping while performing high-efficiency mixing, drying or reacting operations.

I have a temperature-sensitive material or I need to maintain the particle size of my material during mixing or drying operations. What equipment should I use?
Temperature sensitive materials are best dried in either VT or Day Nauta Dryers designed for full vacuum operation. Full vacuum enables drying to be carried out at lower temperatures. Shear sensitive materials may be able to be processed in FKM units run at reduced plow speeds. For extremely shear sensitive materials, the Day Nauta mixer with its extremely gentle mix action is highly recommended. For the same degree of mix accuracy, cycle times are usually longer than for the FKM types.

I need to instantanize my powders by adding a low amount of lecithin. I keep having problems using a low-speed mixer. What's the best option?
Proper lecithinization requires coating of each powder particle with the right amount of lecithin while avoiding formation of lumps. High-speed choppers, combined with suitable lecithin spraying systems will perform the very best operation and yield a highly soluble final product.

I need to dry at a low temperature to avoid material degradation. What's the best way to accomplish this?
Vacuum Drying.  If the required final product requires maintenance of original particle size, using either a Day Nauta Processor Dryer or a Horizontal Ploughshare® Dryer at the proper agitator speed without chopper utilization would accomplish this. If particle size is not a main concern, a Horizontal Ploughshare® Dryer will generate faster drying times.

I have a heavy paste which needs to be mixed. Which options do I have?
Products with high viscosities are easily handled by the Littleford Day Ploughshare®  technology.  Products such as rubber compounds, moulding compounds or adhesives with very high viscosities, in excess of 5,000,000cps, can be efficiently blended in the Littleford Day Double Arm/Sigma Blade Mixers.

I need a highly efficient dispersion of pastes, but at the same time have to control temperature. How can I accomplish this?
Utilize the Daymax Liquid Disperser which is equipped with an efficient jacket to control paste temperature during the high-speed dispersion while its closed-vessel design lowers evaporation losses.

I need to dry paste, but it becomes very sticky at a certain drying step. What options do I have?
There are several drying options that should be tested in an effort to overcome the obstacles that sticky products present. These include choice of vacuum or air purge drying, type of mixing tool, shaft speed, choice of drive assembly, fill level, surface finish, plow to wall clearance, actual drying procedure, or a combination of these.

After mixing dry powders, I need a granular final product, without fine powders. How can I accomplish this?
After a brief mix of dry powders, the addition and dispersion of properly sprayed agglomerating liquid in conjunction with careful use of plows and chopper will bring about the desired agglomeration of the powder blend and eliminate the fines.

My Cowles-Type dispersers aren’t able to disperse certain pigments. What's an option?
Faster Blade Tip-Speed. The Daymax Disperser provides a much faster tip speed which is required to properly disperse certain tough solid particles.

My process requires a high-pressure operation. Does Littleford offer reactor technology?
Yes, the Littleford DVT Series Reactor offers pressure reactions for gas/solids, liquids/solids and solids/solids reactions.  Vessel costs are greatly affected by its pressure rating, therefore, for cost optimization, production equipment should be matched to the specific required internal pressure.

What types of seals should I use on my equipment?
There are several options, from standard packing designs to air-seals and double-face mechanical seals.  Seal choice should be matched to your specific application.

What's the delivery time for your equipment?
Littleford maintains an inventory of Mixers, Dryers and Reactors in its Rental Fleet.  In-stock machines generally deliver within one week of the clients order.  Machines purchased and built for your specific application however, average 14-16 weeks to delivery after drawing approval.

Do you have a Parts and Service Department?
Yes, the Littleford Day Parts and Service Department provides the very best direct support for our equipment.  A fully stocked warehouse provides parts for all our lines of equipment and parts not stocked can be manufactured in our state-of-the-art manufacturing facility. Our service technicians have years of experience providing state-of-the-art support.