Mill, Laboratory STANDARD OPERATING PROCEDURE

Transcription

1 STANDARD OPERATING PROCEDURE Mill, Laboratory Model: Model 4 Manufacturer: Thomas Scientific Location: Dry Processing Pilot Plant, 1851 Food Sciences Building Publication Date: 05/06/2014 Iowa State University does not discriminate on the basis of race, color, age, ethnicity, religion, national origin, pregnancy, sexual orientation, gender identity, genetic information, sex, marital status, disability, or status as a U.S. veteran. Inquiries regarding non-discrimination policies may be directed to Office of Equal Opportunity, 3350 Beardshear Hall, 515 Morrill Road, Ames, Iowa 50011, Tel , eooffice@iastate.edu.

2 Description and Uses The Wiley Model 4 Laboratory Mill is a grinder that uses cutting action to comminute its samples. Fed from the hopper, the material drops into the path of four revolving hard-steel knife blades driven at a high speed by an electric motor. The revolving knives work against six stationary knives and the resulting particles are forced through one of three available steel screens (0.5 mm, 1 mm, and 2 mm mesh). The mill is suitable for grinding soft, medium-hard, fibrous and tough materials. Power Specifications Motor: Wiley Model 3375-E15 Horsepower: 1 HP Voltage/Amperage: 120V/11.8A Phase: Single Speed/Frequency: Hz. Potential Hazards and Safety Precautions Electric Shock/Standard Voltage ( V) Make certain to use the correct outlet that is specifically designed to fit the electrical cord plug. Make sure the area around the outlet, floor and your hands are completely dry when plugging or unplugging the electrical cord to/from the outlet. Sharp, Rotating Cutting Blades/Abrasions, Cuts, or Severed Body Parts Do not insert hands, fingers or other body parts into the hopper or the product discharge shoot while the mill is in operation. The blades are sharp! Use extra caution when cleaning the interior of the mill or changing/ adjusting cutting blades. Mechanical Pinch Points/Possible Entanglement of Extremities, Hair, Jewelry or Clothing Never operate the mill if the chamber door is swung open. Make sure the chamber door is completely closed and secure before operating the mill. Never open the chamber door until the mill is shut OFF, unplugged, and the rotor has come to a complete stop. Do not use any tool to assist product flow through the hopper, as serious injury may result. Make sure to secure long hair and any loose clothing or jewelry before operating the mill. Nothing, except the material for which the mill is intended to cut, should ever be placed into the hopper while the mill is running. 2

3 Flying Debris/Potential Eye Damage Do not operate the mill without wearing all required personal protective equipment, including safety goggles. Required Personal Protective Equipment Lab Coat Dust Mask Safety Goggles Hair Net (Tie Back Long Hair) Boots No Open-toed or Open-heeled Shoes Long Pants & Sleeves No Loose Fitting Clothing Training Required Training *Denotes courses offered online Machine & Site-Specific Training Fire Safety & Extinguisher Training* Laboratory Safety: Core Concepts* Recommended Training for Frequent Users *Denotes courses offered online Laboratory Safety: Spill Procedures Shop Safety Fundamentals: Basic Procedures & Policies* 3

4 Operation 1. Be sure to acquire all required training from the pilot plant manger before operating the Wiley Model 4 Laboratory Mill. Operation requires site-specific training on this machine. 2. Thoroughly read the Wiley Laboratory Mill operator s manual (located in the pilot plant office, 1955 Food Sciences Building) before operating the mill. Please refer to this manual during operation. 3. Be sure to wear all required personal protective equipment previously listed. 4. Before plugging in the machine, open the chamber door and make sure that the grinding chamber is clean. 5. After cleaning the chamber, carefully rotate the blades to make sure that there is no interference between the revolving and stationary blades. 6. Install the delivery chute and the desired screen size (choose from 0.5 mm, 1 mm, or 2 mm mesh openings). 7. Close and secure the chamber door. Note: The mill should be equipped with a chamber door safety switch that, when operating correctly, will prevent the mill from operating if the chamber door is not secured properly (see operator s manual). 8. Plug the power cord into the correct electrical outlet. Note: Make sure the area around the outlet, floor and your hands are completely dry when plugging or unplugging the electrical cord to/from the outlet. 9. Flip the red power switch (located on the right side of the mill) to the ON position. 10. To start the motor, flip the green START switch (located on the right side of the mill). 11. Feed the sample into the hopper slowly enough so that the mill is not overloaded, slows down or becomes jammed. A sliding shutter at the bottom of the hopper controls the feed rate. Note: Samples containing excessive moisture or oil cannot be satisfactorily run through the mill, as this material will cling to the walls of the chamber. Allow these samples to dry or be treated with suitable extraction solvents before milling. 12. Continually adjust the feed rate according to the grinding output. 13. When milling is complete, flip the start and power switches to the OFF position. 14. Carefully unplug the power cord. 15. Let the rotating blades inside the grinding chamber come to a complete stop before opening the chamber door. 16. Remove the delivery chute and screen. Prepare to clean the chute, screen and grinding chamber as per the Clean-up Procedures listed below. 17. To switch screens and mill your sample once again, repeat Operation steps 3 through Report any operational problems to the pilot plant manager. 4

5 Clean-up Procedures 1. Before cleaning, be sure that the mill is turned OFF and unplugged. 2. Dry clean only. Clean the hopper, delivery chute, screens and grinding chamber with a brush and air hose. Do NOT use water. Note: When cleaning, be especially cautious of the sharp blades. 3. Sweep up and discard all debris into the appropriate place for disposal. 4. Once the mill and area is clean, have the mill inspected by the pilot plant manager and initiate check-out procedures. Machine Care and Maintenance The mill must be properly cleaned and inspected after each use. All inspections are performed by the pilot plant manager. Should the rotor-shaft bearings need lubrication, or the cutting knives need replacement, please refer to the operator s manual. Note: These functions should only be performed by the pilot plant manager or a trained service technician. Accessories Three screen sizes (with 0.5 mm, 1 mm, and 2 mm mesh openings). The mill is mounted on a movable cart. 5