Impressions - September 2017 - 34

CTS Imaging System Types & Attributes
Masked (Inkjet) Systems:
* Lower initial cost
* Additional consumable cost of the ink or wax
* Resolution up to 1,200 dpi
* Primary market: T-shirt and small-format graphic printers
* Larger choice of emulsion options when used with static
(stationary) exposure systems
Maskless (Direct-Light Exposure) Systems:
* Higher initial cost
* Do not require ink or wax consumables
* Resolution up to 2,540 dpi
* Primary market: medium- to large-format graphic printers
* Typically requires ultra-fast exposing emulsions to meet
throughput expectations

DIAZO-SENSITIZED EMULSIONS
Single Cure

Diazo

Un-sensitized Emulsion

Diazo Sensitizer

Dual Cure

Resin

narrow band near a single wavelength (e.g., 405
nanometers). To provide better UV breadth,
some systems incorporate two or three different LED wavelengths.
As demand for CTS systems with integrated
exposure increases, so does the demand for faster-exposing emulsions. Those once considered
fast on static light sources now are considered
slow on dynamic exposure systems.

Re-Examining
Emulsion Choices
With many different types of imaging and
exposing systems on the market, and as ink
systems continue to evolve, many printers
now wonder what is best for their systems.
The answer depends on many factors, including ink type and cleanup solvents used,
artwork complexity, job size, and level of stencil control and consistency. Selecting the best
emulsion requires a basic understanding of
the available types.
There are four primary categories of emulsions: diazo, diazo-photopolymer, SBQ and
SBQ-photopolymer. They can be classified by
the type of sensitizer (diazo or SBQ) and the
number of light-sensitized curable components - single cure (one) or dual cure (two).
Diazo emulsions come with a small bottle
of powder (sometimes syrup) that typically is
dissolved in water and mixed into the emulsion. SBQ emulsions also come in single- and
dual-cure formulations.
Dual cures (both diazo and SBQ) contain
UV-curable resin; single cures (both diazo
and SBQ) do not. Also, dual cures are capable of dual resistance (solvent and water),
while single cures are not. The latter provides
single resistance to either solvent or water,
but not both.
Garment printers traditionally used
P.34

single-cure emulsions offering only single
resistance, but now they use inks that may
require both water and solvent resistance. Most
high-solids acrylics contain both water and
solvent, so a dual-resistant, dual-cure emulsion is the best choice for these inks.
Furthermore, some plasticizers used in new
eco-friendly plastisol inks require greater solvent resistance than currently is provided by
some single-cure emulsions, so a dual-cure
emulsion will be more compatible.
The consumer trend is toward SBQ
dual-cure emulsions because they expose much
faster than diazo dual cures, meaning they can
handle the demand for faster throughput associated with CTS equipment with integrated
exposure systems. Dual-cure SBQs typically
have better copying properties and chemical
resistance compared to single-cure SBQs.
While dual-cure SBQs sometimes are called
hybrids, a better definition of a hybrid emulsion may be an SBQ emulsion to which diazo
sensitizer is added.
Both diazo-style emulsions require mixing and four to eight times longer exposure
times than most SBQ-style emulsions, and
have a four- to six-week pot life after mixing.
Conversely, both SBQ-style emulsions
require no mixing, are the fastest-exposing
emulsions available, and have a shelf and pot
life of 12-18 months. Typically, both dual-cure
varieties have better copying properties, exposure latitude and chemical resistance than
single-cure varieties.
Today's printers have myriad screen-making
equipment options, as well as a multitude of
emulsion choices. Developing an understanding of the fundamental principles of screen
making and instituting tighter control of key
variables will enable printers to incorporate
these new technologies while preventing mishaps along the way. 

I M P R E S S I O N S M A G . C O M SEPTEMBER 2017

Diazo

Un-sensitized Emulsion

Diazo Sensitizer

SBQ-SENSITIZED EMULSIONS
Single Cure

SBQ

Pre-sensitized Emulsion

Dual Cure

SBQ

Resin

Pre-sensitized Emulsion

Pictograms courtesy of Kiwo Inc.

Dave Dennings is technical product manager of
screen-making products for KIWO Inc., where he
oversees product development and the company's applications laboratory. He has worked in the
screen-printing industry for 30 years, has served
in technical sales positions with KIWO and Sefar,
and was inducted into the Academy of Screen and
Digital Printing Technologies (ASDPT) in 2006. He
can be reached at daved@kiwo.com.


http://www.IMPRESSIONSMAG.COM

Table of Contents for the Digital Edition of Impressions - September 2017

Impressions - September 2017
Contents
First Impressions
From the Show Director
Overheard
First Look
Scene at ISS
On Design
High-Flying Outerwear Embroidery
Cut From the Same Cloth
Screen Making in a New Era
Shop Talk
Embroidery Design & Digitizing
Sublimation
Direct-To-Garment
Ad Index/Online Directory
Classifieds
Impressions - September 2017 - CT1
Impressions - September 2017 - CT2
Impressions - September 2017 - Impressions - September 2017
Impressions - September 2017 - Cover2
Impressions - September 2017 - 1
Impressions - September 2017 - Contents
Impressions - September 2017 - 3
Impressions - September 2017 - 4
Impressions - September 2017 - 5
Impressions - September 2017 - First Impressions
Impressions - September 2017 - 7
Impressions - September 2017 - From the Show Director
Impressions - September 2017 - 9
Impressions - September 2017 - Overheard
Impressions - September 2017 - 11
Impressions - September 2017 - 12
Impressions - September 2017 - 13
Impressions - September 2017 - 14
Impressions - September 2017 - 15
Impressions - September 2017 - 15a
Impressions - September 2017 - 15b
Impressions - September 2017 - First Look
Impressions - September 2017 - 17
Impressions - September 2017 - 18
Impressions - September 2017 - Scene at ISS
Impressions - September 2017 - On Design
Impressions - September 2017 - 21
Impressions - September 2017 - High-Flying Outerwear Embroidery
Impressions - September 2017 - 23
Impressions - September 2017 - 24
Impressions - September 2017 - 25
Impressions - September 2017 - 26
Impressions - September 2017 - 27
Impressions - September 2017 - Cut From the Same Cloth
Impressions - September 2017 - 29
Impressions - September 2017 - 30
Impressions - September 2017 - 31
Impressions - September 2017 - Screen Making in a New Era
Impressions - September 2017 - 33
Impressions - September 2017 - 34
Impressions - September 2017 - 35
Impressions - September 2017 - 36
Impressions - September 2017 - Shop Talk
Impressions - September 2017 - 38
Impressions - September 2017 - Embroidery Design & Digitizing
Impressions - September 2017 - 40
Impressions - September 2017 - 41
Impressions - September 2017 - Sublimation
Impressions - September 2017 - 43
Impressions - September 2017 - 44
Impressions - September 2017 - 45
Impressions - September 2017 - Direct-To-Garment
Impressions - September 2017 - 47
Impressions - September 2017 - 48
Impressions - September 2017 - 49
Impressions - September 2017 - Ad Index/Online Directory
Impressions - September 2017 - Classifieds
Impressions - September 2017 - 52
Impressions - September 2017 - Cover3
Impressions - September 2017 - Cover4
Impressions - September 2017 - IO1
Impressions - September 2017 - IO2
Impressions - September 2017 - IO3
Impressions - September 2017 - IO4
Impressions - September 2017 - IO5
Impressions - September 2017 - IO6
Impressions - September 2017 - IF1
Impressions - September 2017 - IF2
Impressions - September 2017 - IF3
Impressions - September 2017 - IF4
Impressions - September 2017 - IF5
Impressions - September 2017 - IF6
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