Page 462 - Plastic Process Equipment, Inc

HOPPER MAGNET INFORMATION

WHY RARE EARTH IS BETTER FOR YOUR APPLICATION!

Standard Hopper Grate Magnets are made with one (1) Here’s why you should select
inch diameter magnets on two (2) inch centers. This creates the correct magnet size:
a one (1) inch gap between the magnets. Consequently, the 1. An 8” round magnet gives you 50.265 square inches of
magnets are required to attract and hold tramp metal from a magnetized area as opposed to 660.62 square inches in a
maximum distance of one half (1/2) inch. Due to the fact that 29” round magnet.
Rare Earth Grate magnets capture and hold significantly
2. A larger magnet will permit you to process more plastic
greater amounts of tramp iron when compared to Ceramic
through it between cleanings, however, magnets should
magnets, they are the preferred choice in the plastics industry.
be checked and cleaned as often as possible. Don’t wait
until you change material or color before cleaning your
PPE Stainless Steel Grate Type Hopper Magnets have been
hopper magnet.
designed and developed for use by the Plastics Industry. They
are not a “me too” copy of existing magnets with plugged and 3. A larger magnet allows the material to pass over it more
pinned ends allowing entry of contaminants. Our magnets slowly permitting longer exposure to the hopper magnet’s
magnetic field of flux. This is why we question the use of
are a fresh new approach to not only trapping ferrous metals,
small drawer type magnets. They can be cleaned more
but to also eliminate the problem of material contamination.
easily but they pass more material faster over a smaller
Ask the person who cleans the magnets about plugged and
magnetized surface.
pinned open ends. The components used in the construction
of our magnets are top quality comparable or better than any Hopper Magnet should rest
other magnet brand available. We will always maintain top evenly on all sides of your hop-
quality at fair prices. Note: PPE recommends using Rare Earth per. Never support with bolts
grate magnets only in stainless steel hoppers. Placing Rare which could come loose or cause
Earth magnets in a mild steel hopper may result in serious contamination.
injury.

FACTS ABOUT
HOW TO MEASURE:
Years ago a hopper magnet source suggested you select your
magnet size by measuring up to 8 to 10 inches from the feed
outlet in your material hopper. This was a good idea at the
time because it applied to a few relatively small plunger W006
presses like old 10D8 Reeds which processed small amounts Warning: Magnetic field
of material compared to today’s standards. Through the years FOR MAXIMUM
other suppliers followed the 8 to 10” suggestion like sheep in
a herd since it seemed right because it kept the buyers’ initial PROTECTION WE RECOMMEND:
magnet purchase price lower. 1. A hopper magnet as close to the full size of the hopper as
possible. For example, an 18” inside diameter hopper
Today’s molding conditions and today’s volume of materials should have a 17” diameter round magnet.
processed require magnets suited to the application both in
design and the amount of protection they offer. The frequency 2. The minimum size magnet used should be at least 3 to 4
of today’s high cost of screw and barrel repairs is an indication times the hopper feed opening outlet size. For example, a
4” x 4” feed outlet requires a 12” x 12” or a 16” x 16” square
that more foreign damaging ferrous metals are getting past magnet.
the grate type hopper magnets than ever before. Therefore,
we recommend a magnet as close to the full size of the hopper 3. Be sure the magnet is sized to your hopper. A square hopper
as possible. We realize a larger magnet will increase your should have a square magnet, a round hopper, etc. The
initial purchase price but you will eliminate many hours of magnet should rest on the inside taper of the feed hopper
expensive press down time to justify it. Remember the larger allowing an equal clearance on all sides.
the hopper magnet, the greater the area of protection. We 4. Select the model which is suitable for your application. Fine,
have observed 8” round magnets in 6 foot high 30” round medium, and coarse materials require the correct diverter
hoppers which should have had a 29” round magnet in its angle and spacing to insure continuous material flow without
place. bridging.

PLASTIC PROCESS EQUIPMENT, INC. www.ppe.com
e-mail: sales@ppe.com
E 8303 CORPORATE PARK DRIVE W 6385 MONTESSOURI STREET
A MACEDONIA, OHIO 44056-2300 E LAS VEGAS, NEVADA 89113-1186 Toll Free: USA, Canada & Mexico
S 216-367-7000 • FAX: 216-367-7022 S 702-433-6385 • FAX: 702-433-6388 800-362-0706
T TOLL FREE: 800-321-0562 T TOLL FREE: 800-258-8877 Order Fax: 800-223-8305
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