Pad
printing inks have very excellent release characteristics from the silicon pad.
It is very important that the ink film on the pad becomes tacky by the solvent
evaporation during the transfer process. Ink is used to mark or decorate parts.
It comes in different chemical compositions to match the type of material to be
printed. Pad printing inks are "solvent-based" and require mixing with
additives at the time of use. They typically dry to touch in seconds although
complete drying (cure) might take a substantially longer period of time. Inks
of today (Year 2011) have come a long way. There are many more option. Two part
inks usually have a pot life only a few hours or so. Ink choices are available
in many convenient and time saving forms, but for some substrates you will have
to use the type of ink that best adheres to the surface. It is very important
that the proper ink viscosity is maintained during the printing process by adding
thinner at frequent intervals after (approx. every one hour) during the day. Ink
viscosity plays crucial role in the image transfer process. Often seasonal changes
will affect the actual ratio of solvent used. For e.g. the solvent may flash quickly
in winter because of dry air than in summer when there is moisture in air. Most
of the printing problems that are seen in summer directly relate to heat or humidity
levels on higher side.
Climatic conditions will significantly affect the
performance of any pad printing ink, specially the open ink well style printers.
Also the climate affect other aspects of printing process such as ink pick-up
and release from the plate to the pad to the substrate, as well as keep this in
mind when planning the location of your pad printer. Generally the inks used are
one component inks which can be re-used again and again. Whereas two component
inks can't be used again and again. When we speak of two component inks we are
always refering to hardener as the second component. The addition of hardner allows
the ink to resist mechanical abrasion and most solvents. It is also necessary
to give two component ink a heat cure. It is important to note the difference
between the terms "dry" and "cure". "Dry" simply
means dry to the touch. It does not imply that ink is cured. "Curing"
means that an ink has undergone a chemical reaction and its physical structure
has reaches a maximum level of performance. Various inks are formulated to allow
adhesion to different products/substrates.
Two component inks are also
widely used in industrial pad printing requirements. Maximum recommended thinner
ratio is 15-20%. When you are going to use the ink thoroughly stir the ink in
its can as soon as you open it so that any ingredients of the ink that may have
settled down are properly mixed into the entire contents. All good inks deserves
good mixings. Inks are available in every colour imaginable, they also come in
a variety of series which are specific to the type of substrate to be printed
on. Different materials react differently to the various elements in inks. For
example, the ink used for printing on certain plastics may not adhere to glass
or aluminum. There are medical grade inks for use in the medical industry, as
well as edible inks which can be pad printed onto candles or other food products.
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PAD
PRINTING PLATES (CLICHÉ)
Param
International feels proud in telling that we have developed best quality steel
material plates of lot many different sizes to cater the needs of clients of our
machines and also those who are having some different models.
The benefit
of these type of Laser Etched steel plates is that they can be used for very very
long printing runs and when some particular designs is not to be used again, these
plates can be re-grinded and again laser etched with new design as required. Both
sides of the plates can be made. These are non-sensitive to aggressive inks. Good
quality steel plates can run for millions of prints. The experienced product printing
operators, who are familiar with pad printing process know clarity and definition
of print produced is the quality of the steel plate (cliché).the steel
plate (cliché) durability relates directly to chemical make up, flatness,
hardness and surface finish. |
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PAD
PRINTING INK CUPS
Many different types of
sealed ink cups for different pad printing machines with various sizes like 40mm,
60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, etc. are available. You can purchase
extra cups for machines to reduce the ink colour changing time during printing.
PRODUCT
OR SUBSTRATE.
Product or Substrate is the technical name used to
address any parts of material to be printed, it is critically important to match
substrates and ink series so as to their chemical compatibility.
you will
need a "fixture or zig" In order to hold and support your substrate
in order to ensure good quality printing. Fixtures vary in materials and complexity
depending on the application.
Some substrates like LDPE, HDPE & PP cannot
be printed without pre-treatment prior to the printing process. For this, the
area to be printed of these substrates must be pre-treated by flame treatment
or using base-coat. |
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| OPEN
INKWELS of different size are specially made and also provided on requirement. |
| INK
CUPS of 60 mm and 90 mm are also available |
| BLADES
of different sizes are provided on your valuable orders. |
| CUP
SYSTEM saves inks and works more economical in long runs. This system tackles
several problems that are caused by ink on the machine being exposed to air. With
cup you can ink and protect the ink from dust also. |
| Minimum
evaporation of solvents. No solvents smells. Highest and constant printing quality
because of equal ink viscosity. |
| Also
suitable for in-line machines (as constant monitoring is not necessary. Short
or medium shift stops do not make any problem ( no drying even during overnight
stops) therefor production efficiency is higher. |
| Two
component ink system is having a longer pot life. The cup is easily removable
from the plate and you can change any colour with in 5 minutes. These machines
can reduce the cost of production by actually saving the inks and solvents by
nearly 40% |
| SHUTTLE
System is suitable for Multi color printing i.e. 2-colour etc. It is pneumatically
driven and gives perfect registration with a tolerance of +- 0.02mm |
| The
schuttle is mounted on a working table that can be moved up and down. It is electronically
synchronized with all pad printing machines. |
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