Great Wester Manufacturing

Frequently Asked Questions


Continuous Innovation in Product Protection & Production Sifters Since 1858!

 


Sifting, or screening, is a mechanical process that separates material according to particle size. This is done by moving the material over screens of various apertures to separate coarse and fine material.

Sifting can be divided into three categories:

  • Scalping – removes a small amount of oversize material from the product.
  • Grading – separates material by particle size using appropriate mesh sizes.
  • Fines Removal – removes a small amount of undersize material.

Sifters are used in many industries including: cereal processing, mix plants, bakeries, spice industry, confectionery, dried dairy products, pet foods, plastics, chemicals, and minerals.

HS Free Swinging Sifter – High capacity machine made in two, four, six, or eight sections utilizing from 10 to 30 sieves in three sieve sizes. These machines are suspended with a set of flexible reeds. Dust-tight doors and crevice free joints assure sanitary operation. Interiors are bonded with plastic laminate or stainless steel to meet sanitary requirements and provide abrasive resistance.

Box Type Tru-Balance Sifter –Four to 14 sieves in four sieve sizes to provide 10 to 127 sq ft of sieving area and up to six separations. Can be configured for up to six separations.

Modular Tru-Balance Sifter –A box-less design with nest-together sieve frames, utilizes a pneumatic sieve clamping system or reliable cable clamping system.

In-Line Pneumatic Sifter – Four models available with up to seven sieves, which provides up to 62 sq ft of screen area. All product contact surfaces are fabricated of stainless steel which ensures compliance with the most stringent sanitation standards. The In-Line Pneumatic Sifter allows for direct insertion into a dilute phase vacuum or pressure pneumatic conveying line.

Stainless Steel Gravity Flow Sifter – Two standard models use up to nine sieves providing a screen area of up to 45 sq ft or 80 sq ft. Gravity Flow machines allow for accurate separation and sizing of a single product stream into two or more particle sizes.

GyroSift Sifter – Offers the benefits of our gyratory motion in a small size. Two models with one to four sieves in a variety of construction types.

Sampl-Sifter – A sample sized sifter widely used to determine and monitor sifting and grinding performance.

Please send your trays to:
Great Western Mfg. Co.
Attn: Doug Price
2017 South Fourth Street
Leavenworth, KS 66048

Please include complete contact information with your tray(s):
Contact’s Name
Company
Full Address
Contact’s Phone Number
Contact’s Email

Orders should include tray size or shop number, type of screen desired, type of cleaners, and number of cleaners. If we do not receive these specifications, the tray will be rescreened the same way it was received, including the number of cleaners currently installed.

If a PO hasn’t been provided, we will contact you with pricing after we have received and inspected your trays. You can then provide a PO to begin the repair.
  1. The size of your frame. (Outside dimensions)
  2. Depth – The overall height of the sieve frame.
  3. Sieve Frame Type – Full Cloth, Single Channel, or 2 Sided Channel.
  4. Sieve Hand – Right Hand, Left Hand, or No Hand (Double discharge). (For instructions see How do I determine the hand of a sieve? FAQ below.)
  5. Throat Width – The inside dimension of the throat.
  6. Side Opening – Measure the vertical height of the thrus side opening from the pan to the tray support.
  7. Backwire – Does your sieve have a backwire? If so, what is the mesh size and type (galavanized intercrimp or stainless steel intercrimp)?
  8. Cleaner Compartment Liner – UHMW liners are typical in the tray and/or Pan Compartment. Depending on the type of sieve, the tray may have no liner, a UHMW liner, or a laminate liner.
Special Features – These include lining specifications, saddles on the cleaner compartment cross members, stainless steel facing on the outside of sieve frame, reinforced corners, cutouts, blocks, special bottom sieve, pan cleaner retainer pins, etc.

Determining the hand of a sieve can be done by using one of two methods:

  1. Hold the head of the sieve toward you and the tail away from you. The side of the sieve on which the thrus discharge determines whether it is a Right Hand or Left Hand sieve frame. A No Hand or Double Discharge sieve discharges the thrus out both sides of the sieve.
  2. Place the sieve so that the thrus discharge is toward you. The location of the throat or tail of the sieve (where overs discharge) determine the hand of the sieve.

CLICK HERE for a diagram.

Generally speaking, the rotation of the sifter does not matter. For some types of sieves, you may find reversing the rotation of the sifter can help to retain or accelerate the discharge of oversize material.

We previously had multiple castings used to fabricate various eccentrics. We find it more cost effective to use one casting and reduce raw inventory. Thus, we machine our various eccentrics from a single casting. In order to accommodate all the possible offsets between the shaft and bore, the hub is required to be larger. The larger hub will not affect the form, fit, or function of the eccentric, nor will it affect the balance of the sifter.