PET Food Processing - June 2020 - 33

COLDFORMING
possibilities

FORMULATION

A look at cold extrusion applications
common in the pet food industry.

By Keith Loria | petfoodprocessing@sosland.com

T

There are numerous cold extrusion applications in the pet
food industry that can be broken down into different segments such as products (animal feed, treats, supplements
and medicines), formats (fresh, shelf stable, wet, semimoist, dry, freeze dried or dehydrated), and shapes (kibble,
balls, chubs, cubes, coins, strips, bites, sticks and bones).
"Cold extrusion is applicable for a wide variety of animal
and pet feed, treats, supplements and medicines," said Jeff
Zeak, pet food and treats application specialist for Canton,
Mass.-based Reiser & Co., Inc. "Cold extrusion is very useful when additive ingredients are sensitive to heat as can be
the case with some types of supplements, vitamins, minerals and medicines."   
Eric Altom, Ph.D, technical nutritionist, animal health
and nutrition for New Hampton, N.Y.-based Balchem
Corp., explained cold extrusion is primarily leveraged to
properly mix and form products prior to a final cooking
and/or drying step. This may be a cold, co-product extrusion with two components combined into a single product
or a treat with high fresh meat content.
"Cold extrusion is necessary in the use of fresh meats
in treats and dietary supplements," Altom said. "High
fresh protein treat products can be a challenge in product
development. These products usually contain very high
concentrations of meats, and meats are highly susceptible
to oxidation (proteins, amino acids, fats, and fatty acids).
Leveraging organic trace minerals to limit metals from

being available for chemical reactions, and using encapsulated acidulants to better control pH, can help as a foundational part of the shelf-stable platform in cold formed
products cooked via smoke houses."
Proteins, amino acids, fat, and fatty acids are highly
susceptible to degradative reactions prior to cooking.
When added to the matrix and thermally processed, the
encapsulated acid is released, thereby reducing the pH of
the matrix.
"Certain microbes and pathogenic bacteria cannot survive and/or replicate at low pH concentrations," Altom
said. "This pH reduction will control microbial populations
by providing a stable, targeted pH level in the material.
Encapsulated acids are encapsulated to prevent any prereactions with the matrix's composition, whether that is
protein denaturation (otherwise known as shocking or acid
shock), purging of moisture, or discoloration/off-flavors."
Tim Spannbauer, engineering services manager for
Handtmann, which manufactures vacuum stuffers/formers
used to extrude pet foods and treats, explained the company's role with cold extrusion pet food processing is focused
in two areas: mixing and emulsifying with smart technologies by Inotec, and high volume extruding with its vacuum
fillers and multilane extruding solutions.
"The cold processing of pellets is a growing segment
because of the public's concern for the quality and nutritional content of the kibble, bites and treats they are

After cold-extrusion,
products can be cut
or diced into different
shapes and sizes
based on customer
specifications.
Urschel Laboratories, Inc.

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

PFP_Jun20.indb 33

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5/15/2020 3:05:25 PM


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PET Food Processing - June 2020

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