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Clean(er) Polyester

Polyester’s ubiquity in the outdoor market

and its consequential impact have given rise

to technologies aimed at improving the dye

process on several fronts. One of which was

featured in

Inside Outdoor Summer 2014

,

“Dyeing to be Clean,” a look into waterless

supercritical CO2 dyeing. Another new ap-

proach, with potential lower cost of process

integration and with low or no water usage

could well be a formidable competitor. These

two disruptive technologies have similar

ends, but the following illustrates how differ-

ent they are, starting with supercritical CO2.

A supercritical fluid (SCF) is simply a

lesser known phase of matter unlike the

very familiar solid, liquid and gas states.

The supercritical phase is where matter

transitions back and forth between a liquid

and a gas (Figure 2). The Yeh Group’s Dry-

dye Technology takes advantage of polyes-

ter’s physical characteristics and combines

them with carbon dioxide’s supercriticality to

make a waterless dye process. What makes

CO2 especially well-suited to this process is

its ability to swell polyester.

Additionally, enabled by its gas-like,

low-viscosity behavior, the dyes piggy-

Figure 2. The critical point were carbon dioxide (CO2) becomes supercritical

is at 88F/31C and 1,071 pounds per square inch/7.39 MPa (Image: Creative

Commons CCO 1.0 Ben Finney, Mark Jacobs, 2010)

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cl_insideOutdoorJuly2017.indd 1

12/07/2017 11:18:20 AM

Inside

Outdoor

|

SUMMER

2017

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