Note: Descriptions are shown in the official language in which they were submitted.
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BACKGROUND OF THE INVENTION
The present invention relates to a process for transfer printing papers. More
particularly,
the present invention relates to laser reflecting flip-flop printing on
transfer paper for
screen printing.
Conventional process for transfer printing papers involves printing ink having
a
determined shape on a metal layer which is provided on substrate, resulting in
an
aesthetic effect due to the combination of the ink and reflecting effect of
the metal layer.
However, the conventional transfer printing papers still need to be modified
due to the
following reasons:
1. Most of the conventional transfer printing papers are monochromatic.
Multichromatic effect can be achieved by printing a plurality of colors,
however
the printing process will be uneconomic and time-consuming.
2. Color migration might occur during the colors printing, thus reducing the
yield of
process for transfer printing papers.
3. The aesthetic effects might be diminished since the colors will be blurred
due to
overlapping.
In view of the drawbacks occurring in the prior art methods, the present
invention solves
the problems heretofore commonly in. existence.
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It is the purpose of this present invention; therefore; to mitigate and/or
obviate the above-
mentioned drawback in the manner set forth in the detailed description of the
preferred
embodiment.
SUMMARY OF THE 1NVENTION
It is an object of this invention to provide a process for transfer printing
papers having a
flip-flop effect in an economic and time saving manner.
Further objects and advantages of the present invention will become apparent
as the
following description proceeds, and the features of novelty which characterize
the
invention will be pointed out with particularity in the claims annexed to and
forming a
part of this application.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIME
The process for laser reflecting flip-flop printing on transfer paper for
screen printing is
performed at 22°C to 25°C a humidity of 75% to 85%.
The first step is the manufacture of a substrate consisting of a base paper, a
glue, a
transparent tape; and transparent resin, a hydrophilic paint and a metal layer
is sequence
by a vapor deposition method.
The second step is to print a flip-flop ink of determined patterns on the
substrate by
means of a screen printing. The flip-flop ink is prepared from applying a
metal powder
such as A1 and Ni to a solvent,,mixing the solution by a mixer at 1000 to 1500
rpm for 5
to 10 minutes, adding a defoaming agent and a leveling agent and further
mixing 2 to 3
minutes, adding acrylic resin and butylated melamine resin, and then adding
calcium
carbonate and an anti-settling agent. The surface of the flip-flop ink which
is illuminated
by a light source, may, depending on the visual angle, have different colors.
The flip-flop
effect is achieved by using only one ink, i.e., it is not necessary to perform
a plurality of
printing steps for obtaining the flop-flop effect as used in prior art
methods.
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The third step is to dry the substrate thus obtained in the previous step and
then immerse
the substrate into a weak alkaline solution, for example, a sodium carbonate
solution
having a ratio of sodium carbonate to water of 1:5 and a temperature of
30°C to 35°C.,
for 10 to 15 seconds so that the metal layer which is not covered by the ink
and the
corresponding portions of the hydrophilic paint and the transparent resin are
etched
simultaneously.
The fourth step is to immerse the substrate thus obtained in the previous step
into a weak
acid solution, for example a glacial aectic acid solution having a ration of
glacial aceteic
acid : water of 1:5 and a temperature of 30°C to 40°C., for
about 5 seconds to neutralize
the alkaline solution remaining on the substrate.
The fifth step is to wash the substrate thus obtained so as to completely
remove the
remaining acid solution, alkaline solution, powders of metal layer,
hydrophilic paint, and
transparent resin.
The sixth step is to air dry the substrate thus obtained in the previous step
or perform the
drying at 30°C to 40°C.
After the dried substrate is effected a surface finishing treatment, a
transfer printing paper
having a combination of the flip-flop effect of ink and the reflecting effect
of the metal
layer is obtained.
After the transfer printing paper is subjected to a static treatment, the ink
is directly
applied to an object and then the base paper and glue axe removed, so that the
combination of the flip-flop effect of ink and the reflecting effect of the
metal layer
imparts the object with a multichromatic effect when visual angles vary. Thus,
the third
party will find it difficult to imitate and copy the special effects of the
present invention.
Accordingly, the present invention provides a process for transfer printing
papers having
a flip-flop effect, in which the substrate having a metal layer thereon is
formed with a
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flip-flop ink and the metal Iayer is etched by an alkaline solution, resulting
in the transfer
printing paper having a flip-flop effect. The transfer printing paper of the
present
invention overcome the shortcomings of the conventional transfer printing
paper and also
can be produced in an economic and ime-saving manner.
