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EXTech™ Multiwall Paper Bags
EXTech™ is a family of high performance paper bags developed by combining
the very best high-stress kraft papers available with an advanced bag manufacturing
process. The result, our "EXTech" multiwall paper bags, provides superior
performance while allowing significant paper 'basis weight' reduction.
The high-stress papers we use are made from the strongest fibre available
and have outstanding strength and resistance. Some of the paper used is
as much as 200% stronger than other ordinary multiwall bag kraft paper.
To ensure customers can take full advantage of the opportunities presented
by this tough, lighter weight paper we have invested in modern, high-speed
bag making equipment and methods. Combining these methods and equipment
with our own bag making knowledge allows us to manufacture to the exacting
specifications required and give customers the best attributes of materials
and construction.
EXTech high performance bags offer opportunities not available with conventional
bags:
- Stronger paper means fewer plies and less paper - this means less
packaging volume
- Less volume means less weight - producing less storage, freight,
inventory and handling costs
- Stronger paper results in stronger, lighter bags and better fill
rates
The science behind EXTech:
Softwood tree species that are grown in
cool, temperate zones like Canada, the US Northwest and Scandinavia
produce the long slender and tough fibres that are ideal for high
strength kraft paper. |
| The fibre from these trees is mechanically processed
in the paper making process to develop optimal strength and tear qualities.
New paper making technology means that this fibre is less subject
to being rolled, twisted, bent, crushed and pulled, all of which reduces
strength. "High Consistency Refining" (HCR) results in a 'curling'
of fibre - the formation of kinks, twists and micro-compressions that
create the superior tensile and elastic properties of high performance
bag quality paper. |
Before Refining
Pics. courtesy of Tolko ManitobaIinc.
After Refining |
Modern drying techniques, like "Flakt" drying, further enhance the paper,
allowing it to shrink naturally in the direction that provides the greatest
stretch properties.
The result is paper with superior Tensile Energy Absorption (TEA) - the
amount of shock a multiwall bag can absorb during filling and handling.
This is the most important property defining the strength of multiwall kraft
paper and the bags produced from it. Extech™ papers outperform conventional
multiwall kraft papers by 70 to 200% depending on grade.
See reviews of this paper by some suppliers:
Eurocan (West Fraser)
www.westfraser.com/Products/pulp/kitkraft.asp
Canfor
www.kodiakpolar.com/strengths.htm
Plastic Film and Bags
'Paradigm®' technology films are a new collection of
proprietary films developed by blending metallocene and other resins to
produce high strength, low weight film and industrial plastic bags.
Innovators not only in the use of additives and blends, but also in the
practical aspects of physical film extrusion, our proprietary methods
permit us to process metallocene resins to enhance physical film properties
as measured by tear, dart and tensile strength, sealing temperatures and
film rigidity.
The result is a stronger, thinner and lighter film that works better on
filling equipment because of its stiffness. And, the film produced uses
substantially less resin!
Paradigm technology
Polyethylene |
Polymeric materials are all around us and are naturally
occurring (like wood and natural rubber) or are produced synthetically
(like nylon and polyethylene). Most known synthetic polymers are composed
of combinations of carbon, nitrogen and oxygen. By including other
new elements, materials can be created with unique new properties |
'Metallocene' resins, as the name suggests, are the result of a polymer
that has been changed through the introduction of a metal 'catalyst' into
a chemical reactor when the polymerization of ethylene takes place. When
the resulting polymer resins are used to produce polyethylene film, the
properties of the metal polymer created are passed onto the film.
| The metallocene catalysts used produce polyolefins
(like polyethylene) with controlled microstructures, as defined by
the distributions of molecular weight (MWD), chemical composition
(CCD) and long chain branching (LCB). These distributions determine
mechanical and rheological (form and flow) properties of polyolefins
and consequently their final applications. |
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In the case of Paradigm films, the relative concentration of molecules becomes
much more consistent, offering advantages beyond that of other conventional
polyethylene films.
Paradigm films:
- Are stronger, stiffer films
- Have better sealing properties
- Permit use of narrower gauge film
- Use less resin
And the advantages of this 'Paradigm' are in addition to the high barrier
properties and hermetic seal inherent in polyethylene film and film packaging.
Innovations such as our Paradigm Technology Films have permitted many
customers who are currently shipping product in other forms of packaging
to achieve the advantages of plastic, while reducing their packaging,
handling and inventory costs.
For more information about metallocene resins:
pubs.acs.org/hotartcl/cenear/950911/art01.html
For more information about multilayer technology:
www.macchi.it/news/06en.html
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