Pinhole, adhesion and Blocking as common problems in Flexo printing

1. FLEXOGRAPHY
TROUBLESHOOTI
NG
Ir. Sugeng Endarsiwi, ST, MBA
(Professional Engineer at PII)
Pinhole, Adhesion,
Blocking

2. The Contents:
Pinhole
A common issue with flexible
packaging designs is the
“pinholing” effect.
It describes the uneven or
incomplete ink distribution
when printing a solid area,
which leads to a loss of
density and reduced color
vibrancy.

3. PinholE

4. A common issue with flexible packaging designs is the “pinholing”
effect. It describes the uneven or incomplete ink distribution when
printing a solid area, which leads to a loss of density and reduced
color vibrancy.

5. Adhesion,
A property of a substance that
describes its ability to stick to
another material, either mechanically
or chemically, as in the ability of a
printing ink to adhere to the surface
of a paper.
Treat substrate if treatable, but do
not over-treat; change to
recommended ink type; and/or
coating primer if possible.

6. Trapping is,
a pre-press technique used to compensate for registration
errors in lithographic printing and is the process of adding a
slight overlap between adjacent areas of colour to avoid gaps
caused by misalignment.
Wax or slip aid in first down ink
is excessive.
second down ink is not
compatible with first down ink.

7. blocking,
as "an undesired adhesion between layers of materials placed in contact under
moderate pressure and/or temperature in storage or use, usually occurs in a
stack of printed material that is stacked prior to thorough drying." This can occur
with single- or double-sided prints.
Add a wax compound or silicone (if applicable) to formula
structure. Wax/silicones will act as a release in the re-wind

8. Author:
Sugeng Endarsiwi was born in Purworejo, Midst
Java but when grow up live in Banten west java.
18 years working at overseas as Printing Ink
Manufacturer. Vietnam for 13 years, and Malaysia
for 4 years. During working overseas, He also has
project to completed to Sri Lanka, Philippine,
Thailand and Singapore.
Graduated from Trisakti Printing Academy, Jakarta
(ATGT), and Bachelor of Art as Industrial
Engineering from UMB, Jakarta. Also, an
Executive MBA graduated from Jesselton
University college, Malaysia.
Registered at PII (The Indonesia Engineer
Institution), 2022
Chartered Management Association (CMA, HK
SAR), 2022
Currently live in Tangerang, Indonesia after
relocate from Malaysia since 2021.
Email address: endarsiwi.sugeng@gmail.com