Cleaning and processing herbs:

Separating good from unwanted materials, classifying, separating and reconditioning.

To achieve this target we follow HACCP quality control systems, laboratory facilities and our well trained staff properly operate the right equipment that remove or reduce the percentage of extraneous materials such as excreta, foreign  seeds, leaves, stones, hair, stems, insects, metal, wood, glass, etc.

Cleaning process is based on some physical properties of herbs such as:

  • Size and Dimension
  • Weight and Specific Gravity
  • Different Behavior in Air Currents
  • Metallic Properties


And based on basic equipments like:

Air Separator (Aspirator):

Each herb has a size, shape and density that reacts to an air current.  A steady stream of material is  subjected to a steady flow of air.  The air pressure can be regulated so that the heavier materials will fall and the lighter materials will be drawn forward.

This equipment helps to remove items as feathers, dust or dirt, stems, and sometimes insect fragments from spices.

Cutting Machines:

Cutting machines are used to reduce products to a smaller, more uniform size to allow for better cleaning and separation of unwanted materials in herb products.  The cutters provide high capacity product reduction and are in widespread use for cutting, chopping and producing herb products of a specific size or granulation achieving geometrical shapes and particle sizes for the herbs.



A destoner is effective for removing stones by flowing dry material over an inclined, vibrating, screen covered deck. Air from a pressure fan located in the body of the machine below the deck is forced up through the deck and through the bed of material.  This steady air flow holds the material in stratified flotation.  The lighter material stays in the upper strata as it flows down the inclined vibrating deck. The heavier material, such as stones, coarse sand, glass and metal, travels up the inclined vibrating deck and out. The fine sand falls through the screen and into the body of the destoner where it is removed.


Vacuum Gravity Separator:

The vacuum gravity separator or air table separates material on the principle of density.

The device mechanism consists of a perforated, vibrating deck or screen through which an air current is blown.  The angle at which the screen is set, the frequency of vibration and the air velocity are adjusted to achieve the desired separation.  The oscillation of the deck “walks” the heavy material, such as dirt or stones uphill, while light material, such as stems and leaves, float on the air and go down the table.  The medium density material, usually the intended product, goes to the center.  By means of movable   splitters, the discharge can be divided into a number of density fractions.


Cylinder Separator (Indent):

Indent cylinders use centrifugal force and length differences to lift material from a seed or leaf mass, making a length size separation.  The indent cylinder consists of a rotating, horizontal cylinder and a movable, horizontal separating trough.  The inside surface of the cylinder has small, closely spaced, semispherical indentations.  In operation, the seed or leaf masses, to be separated, lie on the bottom of the cylinder. As the cylinder rotates on its axis, the short seeds or leaves in the mass are lifted from the mixture by the numerous indents.  At some point before reaching the top  of the rotation, the good seeds or leaves drop from the indents and are received by an adjustable trough or vibrating tray to the discharge conveyor.


Sifter Aspirator:

The sifter aspirator combines the use of air movement with sifters to separate materials.  The material to be cleaned is fed into the aspiration channel over an oscillation conveyor.  A vibrating motor causes the feeder table to swing horizontally. At the same time, the weight of the material being cleaned opens the feeder uniformly and a thin stream along the entire width of the aspirator is discharged.  In the aspiration channel, the adjustable stream of suction air passes vertically upward through the thin horizontally fed stream of material and carries the undesirable materials (dust, husk particles, light seeds, etc.) into the expansion chamber. The cleaned product then falls directly out of the aspirator and is ready for further processing.  The back wall of the aspiration channel is adjustable to obtain optimum separating action. 

The double-valve airlock discharges materials, without difficulty, which would normally adhere to surfaces.



A sifter separates dry materials by  particle size.  It allows for the removal of undersize and oversize materials.  The sifter mechanically shakes a sieve or sieves.  The sieve screens can be the same size or can be various sizes, depending on how many separations are to be made. In the sifter, the finer material drops through the screen, and the coarser material rides over and is discharged.

They provide dependable continuous performance and allow for removal of contaminants such as large stems, and bits of paper or plastic.


Spiral Gravity Separator:

The spiral separator is a device used primarily for separating round seeds from fractures, shriveled kernels or other impurities.  It consists of a number of descending spiral chutes around a central column. The spiral separators separate seeds according to shape and their ability to roll or slide. 

To operate, material is dropped from a feed hopper into the top of the inner most steel spiral at a steady rate.  The uniformly pitched slides of the separator carry the material down by gravity.  After attaining optimum speed, the faster moving spherical seeds, roll toward the outer edge of the slide and are discharged.  The flatter kernels and oddly shaped contaminants discharge near the center.


Air Screen Separator:

The air screen separator separates materials on the basis of differences based on spice size, shape, and density.  The separators  use three cleaning elements: aspiration in which light material is removed;  scalping in which material larger than the product desired is removed; and grading in which separation of the product can be in two classifications – large or small. The separator units come in a variety of  models with two to eight vibrating screens.  

Material to be separated falls through the inlet onto the top sieve, which scalps and removes such impurities as string, straw, and stones. Air streams remove the trash and impurities, and the product moves into the second sieve which holds acceptable material allowing sand and smaller impurities to fall through.



The most common and simplest devices used for cleaning ferrous metal are magnets.

Magnets catch and remove damaging iron contamination from material flows.

Magnets are placed at raw material inlets and usually before and after milling equipment.

The equipment is dependable and provides economical protection against tramp iron damage in processing lines.  Magnets catch and remove damaging iron contamination from material flows.  They help prevent machinery damage and costly shutdowns, spark-caused fires and explosions and product contamination.


Metal Detectors:

Metal detectors are used to detect all types of metals, both magnetic (iron) and non magnetic, such as aluminum and other non-ferrous metals, including stainless steel.  These devices operate on the  inductive measuring principle.   A high frequency electromagnetic alternating field is generated.  If a metal object passes through the metal detector, the detector experiences a  change in the field based on the magnetic and electrical properties of the metal object.

Metal detectors help protect both the processors and end consumer from metal contaminates.