Accurate in pad printing technology, color reduction plays an important role in the quality of printing.In color matching and color measurement equipment related color matching subject is the science of objective, the expression of the available data;And has nothing to do with the equipment of color matching subject is subjective, is limited by self-restraint, observe the level of art.In order to content the needs of the customers, press both want to consider the influence of the objective data, and to consider to achieve the artistic effect.
Observation target, observation light sources or light and observer is necessary to form a specific color of the three elements, be short of one cannot, observer to colorific regrets infection ability is limited by many factors, almost all of the variables are included in the observation of the three elements of color, these variables affect the colour matching ability, any one variable changes will affect this transfer after image color, the following will introduce these variables influence.

      The influence of substrates

The customer required a certain color usually come from color matching system such as Pantone color sample or a certain scale.For the influence of the substrates, mainly consider the following four aspects:

     The base color of substrates or medium and the influence of surface characteristics

Reach a certain covering power required for printing

Ink to add material, thinner, and the influence of the catalyst

Have adapted to a certain colour printing way

The base color and surface characteristics

        Substrate surface color is the image color reduction effect on printing technology of important factor.Observing the printing color, can see color is from the surface of the substrates and printing ink dieyin layer of light reflection to the eyes.Because of accumulated on substrates in the pad printing ink layer thick, so the light through the ink layer to the bottom base, usually then after the base surface reflection, again through the ink layer, reflection to the eyes.In the bottom of the substrates on the reflected light is related to the color of the material itself, especially the color dark substrates themselves, and observations on its relatively light, the effect is more significant.

        Substrate surface properties such as smoothness or smoothness, porous of color reproduction effect also plays an important role, observed in the same color but different roughness of the unification of the two kinds of medium color, visual effect is gained by the different: on the base in the bottom of a smooth color looks more bright, the higher;Printed on the surface of the fabric and other porous coarse, same color is dark.This is because the two hostages reflect light caused by different, when the light to smooth level off of the surface of the medium and large department reflect the light in the same point of view, thus reflecting the light into the human eye big department;On the contrary, coarse, porous surface light reflection from different angles, into the light of the human eye is much less.

      Therefore, printing of the closer with the colour collocation of the substrates, the pad printing effect, the better: a certain color can be coated or not coated paper media representation of color, and in the dark plastic medium reproducibility is poor.In addition, for the premise in a particular way of printing, to print white ink as the bottom of layer or one multilayer gezer, otherwise there will be a better matching effect.For transparent varnish applied, for example, in order to avoid losing characteristics, before printing any color printed a layer of white ink.

Print the number

      As mentioned earlier, observe the print color at the same time, also saw the color of the substrates themselves, in order to reduce the influence of substrates, selection of ink should be as opaque as possible.Dry in the pad printing, printing ink layer thickness is about 20% of the plate erosion depth.If etching depth of 0.001 inches, so dry film thickness between 0.0002 inches and 0.00025 inches, it has to do with screen printing compared to much thinner, so too thin film under enough to cover the influence of the substrate color.One solution is to increase etching depth, but the depth more than 0.0015 inches, ink transfer is greatly reduced, the image becomes trance, began to paste, so can only take another way to print the number of advanced, in printing, a process known as double or multiple printing printing.

     Using multiple printing will extend the time of produce, so before taking multiple printing, to decide whether or not to do so can obtain the required yield rate, even a single printing can't really be the ideal color match, does not necessarily produce at the expense of time cost and use printing for many times, can reduce diluent or increase the number of pigment in the ink.In addition, several times with printing before, shall determine the increase in number of printing, whether to still maintain a good image details clearly, in the process of printing not deformation or bending.