PET Food Processing - June 2020 - 46

EQUIPMENT

MUENSTER MILLING CO.'S EXTRUSION PROCESS
Muenster Milling C o., Muenster, T ex as, uses a single-screw
W enger ex truder to create its pet food products, said C had
Felder o director o o erations
O r et ood starts its o rne in a o r or
eanin
t at e er t in as een ro nd into a ne o r so t at t e
particles are around 3 / 6 4 of an inch in siz e," he said. " After
ein ro nd into a ne o r t e et ood t en a es its a
to t e conditionin c linder
ic co ines stea and ater to
create a slurry type product."
is sl rr t en is o ed
t e conditionin c linder to t e
inlet t roat o t e e tr der Felder o said
e et ood is t en
introd ced to t e sin le scre and e ins o in do n t e
lti i ted a er
e di erent i ts o t e a er slo and s eed
t e
rocess o o in t e et ood t ro
t e e tr der e
said
ese di erent i ts and conto rs are at creates
t ei
ense a o nt o ress re t at rea s do n t e
car o drates in t e o r and ca ses t e to elatini e
e et ood t en o es to t e end o t e e tr der co
onl
re erred to as t e ead o t e e tr der Felder o e lained
ere are an ario s attac ents at t e ead o t e
ex truder that help to shape the product you see on the store
shelves," he said. " W e use an E ver E x truder valve to help us
control t e ress re and coo o t e rod ct
e r ose
of this valve is to act as a restriction plate and slow dow n the
a o nt o rod ct t at is allo ed to reac t e die late
e
need to et ore coo t en e increase t e restriction on t e
al e and i e need less coo
e o en t e restriction on t e
al e Felder o said
ter t e rod ct o es t ro
t e al e it t en o es to
the die plate.
" T he die plate is also a very crucial part of the ex truder, and
t e a e and t e nat re o t e ild o t e die late la s a
cr cial role in o t e rod ct loo s en it e its t e e tr der
Felder o said
e die late t icall as c to ts o s a es t at
are placed evenly around the die plate. T he die plate shapes the
et ood into a c lindrical or rectan le or
ter t e rod ct asses t ro
t e die late it is et it
t e ni e set
e ni e set t at e se is t e atented er tr der
ni e set t at is ade
o car on lades t at are eld on
a
s rin loaded
Felder o said
e ni e set
dictates ot t e len t and t e s a e o t e
die plate.
ere are t o aria les to t e ni e set t at t e o erator
as t e a ilit to control e said
e rst ein t e n
er
o ni es t at are sed t ical set is aro nd e to ei t
ni es t at to c and c t t e i le
e ot er aria le is t e
s eed at
ic t e ni es s in a ainst t e die late
e s eed
at
ic t e ni es t rn el s deter ine t e len t
e ni es
die late and s eed at
ic t e t rn are all i ortant in
deter inin t e si e o i le

46

The shape and size configurations of a die plate, as well as the
speed at which knives rotate around the plate, determine the size
and shape of an extruded kibble or treat. Wenger
manager, Corporate Project Services, a division of Wenger
Manufacturing, said it's important to know what pet food
manufacturers intend to produce (e.g., standard pet food,
high-meat pet food, short treats, long treats, etc.) to determine the equipment requirements and layout.
"For example, to be able to produce both pet food and
long treats using the same extrusion system, multi-directional die arrangements would be required," he said.
"Long goods would be extruded in the form of ropes
straight out onto conveyors. Pet food and short goods
would be routed directly into a drying device."
For products requiring a 50/50 color split, Tramp said
there's a unique die that injects color into the extrudate
stream to accomplish this.
"More advanced multicolor products may require a
second extruder with a specifically designed die that allows both extruders to feed product into the die at the
same time," he added.
Hadrien Delemazure, feed extrusion expert at
Firminy,  France-based Clextral, said dry kibbles and
treats are treated differently at the end of the barrel.
"Dry kibbles are usually cut at the die face," he said.
"These products are slightly expanded and have moisture
around 20% to 25% and density around 350-450 grams
per liter as they exit the extruder. Die heads are available
that can provide up to four shapes simultaneously.
"Pet treats are usually formed by a remote cutter,"
Delemazure continued. "Ropes or strings of product exit
the extruder and are fed by conveyor to the cutter."

PET FOOD PROCESSING | June 2020 | www.petfoodprocessing.net

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PET Food Processing - June 2020

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