PET Food Processing - September 2021 - 48

EQUIPMENT
" Co-extrusion
combines
steam-induced
expansion and
filling injection
for expanded
products with
dual textures. "
Dave Carney, B├╝hler
and filling systems can combine both nutritional and
prescription ingredients for specific dietary requirements,
as the filling does not reach the high temperatures
and pressure as
the extrudate, "
said Hadrien
Delemazure, process engineer, feed extrusion expert,
Clextral, Firminy, France.
But Clextral cautions, " co-extrusion shouldn't be confused
with 'true co-extrusion,' which implies two extruders
connected together to extrude two products simultaneously
and form only one, " according to Clextral's website.
Also known as co-filling, co-extrusion can be used
for profiles featuring crunchy exteriors and creamy or
liquid-filled centers. Ingredients for the crispy outer
shell are mixed, cooked and processed in the twin screw
extruder while the filling is mixed and prepared in a
separate recirculating tank. The filling is then injected
into the extruded material just before the extruder die.
To ensure there is no disruption of the filling, it is important
to know the filling percentage at all times so all
pillows are properly filled.
These crunchy-on-the-outside treats are often marketed
as dental treats, a category that continues to grow
in pet market sales of pet food with health claims for
dental hygiene. Kansas City Treats, Kansas City, Kan.,
produces dental and long-lasting chews, a $1 billion segment,
that deliver dental benefits through mechanical
abrasion. The company's co-extrusion process uses twinscrew
extruders from Wenger, Sabetha, Kan., to create
products with an outer envelope and an auxiliary system
for injecting a filling. After extrusion, the product is
dried and cooled. An array of shapes and textures can be
produced using this technology.
Considerations for consistency
Reiser, Canton, Mass., offers a variety of meat extruding
systems including a solution combining a Vemag
Stuffer with a shape-forming extruding attachment. The
Vemag Stuffer features a powerful positive displacement
48 PET FOOD PROCESSING | September 2021 | www.petfoodprocessing.net
double-screw pump to provide portioning accuracy that
transports product gently without smearing to achieve a
consistently accurate portion size and weight.
Compared to a kibble that is cut at the die level and
sent to the dryer, co-extruded product comes out the extruder
as ropes that need to be managed and manually
fed into a pinching former by the operators on startup.
With many outlets (up to 12), the linear speed between
each rope needs to be even to obtain consistent product
dimensions, according to Delemazure.
The pinching former, another important piece of
equipment, crimps the ropes into individual pieces. The
pinching former needs to be mechanically resistant and
consistent in alignment so the product will be crimped
well for easy separation later in the process. Delemazure
recommended considering that the product may not be
fully separated at the pinching former and to accommodate
this while transporting the product. For this, he
suggested a horizontal belt dryer.
" Co-extrusion combines steam-induced expansion
and filling injection for expanded products with dual
textures, usually with a crispy shell and a soft filling, "
Carney said. " One of the challenges of co-extrusion is
the potential for moisture to migrate between the filling
and the cream, which is controlled through the ingredients
and extrusion settings, set to cooling parameters. "
To prove out the dynamic extrusion conditions needed
for co-extruded pet food products, Carney suggested
processors run pilot trials for new products, on scalable
systems, before running larger lots while sampling
for consistent results. A user-friendly control system on
the equipment helps control ingredients and parameters
like temperature, specific mechanical energy and speed.
Along this vein, co-extrusion equipment manufacturers
Co-extrusion is popular in the long-lasting dental chew category
where it is often used to deliver two formulas, each offering
unique health benefits to pets. Kansas City Treats
http://www.petfoodprocessing.net

PET Food Processing - September 2021

Table of Contents for the Digital Edition of PET Food Processing - September 2021

PET Food Processing - September 2021 - Intro
PET Food Processing - September 2021 - 1
PET Food Processing - September 2021 - 2
PET Food Processing - September 2021 - 3
PET Food Processing - September 2021 - 4
PET Food Processing - September 2021 - 5
PET Food Processing - September 2021 - 6
PET Food Processing - September 2021 - 7
PET Food Processing - September 2021 - 8
PET Food Processing - September 2021 - 9
PET Food Processing - September 2021 - 10
PET Food Processing - September 2021 - 11
PET Food Processing - September 2021 - 12
PET Food Processing - September 2021 - 13
PET Food Processing - September 2021 - 14
PET Food Processing - September 2021 - 15
PET Food Processing - September 2021 - 16
PET Food Processing - September 2021 - 17
PET Food Processing - September 2021 - 18
PET Food Processing - September 2021 - 19
PET Food Processing - September 2021 - 20
PET Food Processing - September 2021 - 21
PET Food Processing - September 2021 - 22
PET Food Processing - September 2021 - 23
PET Food Processing - September 2021 - 24
PET Food Processing - September 2021 - 25
PET Food Processing - September 2021 - 26
PET Food Processing - September 2021 - 27
PET Food Processing - September 2021 - 28
PET Food Processing - September 2021 - 29
PET Food Processing - September 2021 - 30
PET Food Processing - September 2021 - 31
PET Food Processing - September 2021 - 32
PET Food Processing - September 2021 - 33
PET Food Processing - September 2021 - 34
PET Food Processing - September 2021 - 35
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PET Food Processing - September 2021 - 37
PET Food Processing - September 2021 - 38
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PET Food Processing - September 2021 - 42
PET Food Processing - September 2021 - 43
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PET Food Processing - September 2021 - 84
https://digital.petfoodprocessing.net/sosland/pfp/pet-food-processing-september-2021
https://digital.petfoodprocessing.net/sosland/pfp/pet-food-processing-june-2021
https://digital.petfoodprocessing.net/sosland/pfp/pet-food-processing-march-2021
https://digital.petfoodprocessing.net/sosland/pfp/2020_12_01
https://digital.petfoodprocessing.net/sosland/pfp/2020_10_01
https://digital.petfoodprocessing.net/sosland/pfp/2020_09_01
https://digital.petfoodprocessing.net/sosland/pfp/2020_06_01
https://digital.petfoodprocessing.net/sosland/pfp/2020_03_01
https://digital.petfoodprocessing.net/sosland/pfp/2019_12_01
https://digital.petfoodprocessing.net/sosland/pfp/2019_10_01
https://digital.petfoodprocessing.net/sosland/pfp/2019_09_01
https://digital.petfoodprocessing.net/sosland/pfp/2019_06_01
https://digital.petfoodprocessing.net/sosland/pfp/2019_03_01
https://digital.petfoodprocessing.net/sosland/pfp/2018_12_01
https://digital.petfoodprocessing.net/sosland/pfp/2018_09_01
https://digital.petfoodprocessing.net/sosland/pfp/2018_06_01
https://digital.petfoodprocessing.net/sosland/pfp/2018_03_01
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