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What is
"Soarnol®"? |
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"Soarnol®"
is the trade name for ethylene vinyl alcohol copolymer (EVOH)
resin manufactured
by The Nippon Synthetic Chemical Industry Co., Ltd. (Nippon
Gohsei). Polyethylene, polypropylene, nylon, polystyrene,
polyester and other materials can be combined to form multilayer
films, sheets, bottles, tubes, pipes and so on. Using Soarnol®
with these molded materials creates a product with excellent
gas barrier properties, solvent barrier properties and fragrance
preservation properties, suitable for use in a wide array
of packaging products that include food packaging, medical
packaging, cosmetic packaging, and agrochemical containers. |
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What are
the properties of Soarnol®? |
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Gas barrier properties,
solvent resistance, oil resistance, solvent barrier properties,
high transparency, weatherability, fragrance preservation,
printability, high luster, environmental preservation performance,
and others. |
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What kind
of method is used to manufacture Soarnol®? |
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Soarnol® is manufactured
by polymerizing vinyl acetate monomer and ethylene monomer
and hydrolyzing the resulting poly-(ethylene-vinyl acetate). |
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What is
the chemical structure of Soarnol®? |
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Soarnol® is a random
copolymer of ethylene and vinyl alcohol. |
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What
is Soarnol®'s shape? |
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Soarnol® is manufactured
in cylindrical pellet form. |
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Does Soarnol®
contain any lubricants? |
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Yes, depending on the grade.
Customers may choose grades that either include or do not
include lubricants. |
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What does "MFR" mean? |
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"MFR" stands
for "melt flow rate" and indicates the quantity
of resin that flows out from a cylinder during a ten-minute
period at a prescribed temperature and load. A high MFR value
indicates a low melt viscosity. |
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How does
one go about selecting the proper grade of Soarnol®? |
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You should select the grade
of Soarnol® by the required barrier properties and the
processing method to be used. For example, grades with a
low ethylene content (for example, 29 mol%) offer better
barrier properties at normal humidity than the grades with
a high ethylene content (for example, 44 mol%). On the other
hand, grades with a high ethylene content have a lower melting
point than those with a low ethylene content and can generally
be molded easily even at low processing temperatures. Other
selection criteria include the melt flow rate (MFR). You
should select the ideal MFR for the fabrication conditions. |
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How should
Soarnol® be handled? |
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Soarnol® is hydrophilic
and will absorb moisture if unprotected. High moisture uptake
will not degrade the polymer but can cause voids during processing.
After use, be sure to protect remaining
Soarnol® from
moisture uptake by sealing it in its original (moisture proof)
container. If it has absorbed moisture,
dry
it
until
the moisture
content
is 0.3% or less. Please see the separate technical references
for the proper drying conditions. |
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How transparent
is Soarnol® film? |
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Soarnol® film has
extremely high transparency. |
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Do barrier
properties of Soarnol® depend on the humidity? |
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Barrier properties decrease
as the humidity increases. Normally Soarnol® is used
in a multilayer configuration with other resins having
good moisture barrier
properties. |
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How does
one determine the thickness of Soarnol® that one needs? |
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Many factors come into play when determining
thickness required, such as shelf life, Soarnol® grade
type, storage conditions, etc. Please contact us for assistance
in making this determination. We can provide calculations using
Nippon Gohsei's proprietary simulation program, GTR2000. |
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How is
Soarnol® processed? |
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Recommended screws for Soarnol®
have LD=24-30 and CR=3-3.5. Temperature conditions are generally
190-230deg C(374-446deg F).
In order to prevent thermal decomposition, please make sure
the temperature does not exceed
250deg C(482deg F). For more information, see the Processing
Technique page. |
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What is
the recommended screw design? |
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You should avoid using rapid
compression type screws such as those used for nylon. There
should be at least four turns in the compression zone;
this number will vary slightly depending on the L/D and compression
ratio. Trouble is particularly likely to occur on high revolution
extruders equipped with rapid compression type screws with
1 - 3 turns in the compression zone. The recommended
percentage of turns in each zone should be as follows: 30-40
% in the feed zone, 20-25 % in the
compression zone
and 35-50 % in the metering zone. |
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What kind
of adhesive resins are appropriate for Soarnol®? |
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Through our sister company,
MSI Technology L.L.C., we can help you select the proper
adhesive resin for your applications. (MSI Technology markets
Plexar® tie layer adhesive produced by LyondellBasell.)
For details, contact your Soarus'
representative. |
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