Fitzmill Comminuting Machine
Fitzpatrick Fitzmill Comminuting Machine
Fitzmill Comminuting Machine, Model D-2 made by the W. J. Fitzpatrick Company, Chicago Illinois.
Drive: 5 HP motor, Peak motor load 1750 rpm.
The FitzMill Comminuting offers a unique combination of efficiency and flexibility for emulsifying pulverizing, granulating, emulsifying, blending and dispersing and similar process operations calling for controlled size reduction.
Material is gravity feed into the milling chamber tangentially to the rotation of the blades into the milling chamber. The type, quantity, speed (600 rpm to 5000 rpm), direction (forward or reverse) and shape of the blade helps determine the degree of reduction achieved based on the material being processed. Some blade styles offer flexibility of knife on one side and impact on the other. Knife-edged configuration is for gentle granulation and impact-edged for more aggressive reduction.
The different types of blades are described below:
Swinging type with flat impact on both sides. This type of blade is used when operation requires pulverizing or the dispersion of products. Examples include pulverizing of dried milk, chemicals, or other similar products, or dispersion operations including the distribution of colors in wet or dry bases, the dispersion of solids in oil bases.
Swinging type with flat impact on one side and a sharpened or knife-edge on the other side. This type of blade provides complete flexibility for both pulverizing and dispersion operations, as well as granulating and precision pulverizing with a minimum of fines.
Swinging type with sharpened or knife edges on both sides. Blades of this type are indicated when the operation is confined to precision granulating and has proven to be particularly efficient in producing uniform granulation.
Fixed type with a flat serrated edge on one side. The use of these blades are for pulverizing and a concave cutting edge on the other side for sizing products like fruits and vegetables and other similar products. Because these blades are fixed, the rotor may be operated at very low speeds, which permits the cutting without mashing of shoft products.
Fixed type with flat impact edges on both sides. These blades are good for shredding and pulverizing.
Fixed type with knife-edges on both sides. (Half of standard thickness, or 1/8”.) These blades are best for chopping.
The
screens used for the Fitzmill are stainless steel and can have round or square
perforations available in a wide range of size openings. The different sizes
available onsite are summarized in the table below. And to meet other
processing needs, a variety of screens can be purchased which can have round or
square perforations, diagonal or straight slots, or wire-mesh openings.
| Label | 112S | 7 | 6 | 5 | 4 | 3A | 3 | 2A | 2AA | 2 | 1 | N00 |
| Size (in) | 1.5 | 1 | 0.75 | 0.5 | 0.25 | 0.187 | 0.125 | 0.093 | 0.075 | 0.063 | 0.031 | 0.02 |
| Size (mm) | 38.1 | 25.4 | 19.05 | 12.7 | 6.35 | 4.75 | 3.17 | 2.36 | 1.9 | 1.6 | 0.787 | 0.51 |
| Holes | Square | Round | Round | Round | Round | Round | Round | Round | Round | Round | Round | Round |
| Type** | A | A | A | A | A | A | A | A | B | B | B | B |
**Type A screens are perforated from 18-gauge stainless steel. Type B screens are perforated from lighter gauges of stainless steel, reinforced on the back with 18-gauge.
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