In plastic printing, the control of ink viscosity is very important. Especially in high-speed printing, whether the viscosity is controlled properly will directly affect the gloss of the product; static electricity; block printing; water lines; Based on my personal operating experience, I will introduce some reasonable control methods.
Usually the ink is composed of resin, pigment, additive and solvent. The quality of the pigment transfer is directly related to the viscosity. Ink manufacturers generally recommend that the ink viscosity control between 15-18S. However, in practice (printing speed 100M/MIN or more) tells us that in order to ensure a good transfer effect, it is advisable to control the viscosity between 12-25S (the third Zahn cup). The greater the viscosity is, the poorer the effect of pigment transfer is, because the greater the viscosity is, the worse the fluidity is, and the particles cannot be uniformly dispersed and clustered, resulting in failure to enter the cell site and block the plate. Therefore, to ensure that the ink has a certain degree of fluidity at an appropriate viscosity, the pigment can be dispersed therein and smoothly enter the cell site.
In the plastic printing process, we often see a layer of stencil that has a roll. If it is used for a long time, it will be transferred to the substrate to produce ink that is not clean and the name is dirty. Produced dirty version in addition to the hardness of the knife, pressure and angle, the quality of the version is related. With the ink viscosity is also a great relationship, because the viscosity is too large, the ink's fluidity is poor, can not be evenly dispersed and accumulated together, causing the knife to the version of the roller damage, resulting in dirty version. At the same time, the ink is also in a state of supersaturation. A large amount of resin accumulates together and has affinity for the plate roll under the pressure of the knife and sticks on the platen roller to form a dirty plate. In general, the problem of controlling the dirty version is not easy to occur.
Ink viscosity is too low, indicating that the higher the solvent content, the pigment and the resin is relatively small, so that will appear on the substrate will appear white, no gloss (saturation) but also produce water lines and static electricity phenomenon . Therefore, we can see the importance of proper ink viscosity for the quality of the products we guarantee.
"It used to be like this before and it wouldn't be a problem." "It's just a little bit okay." "It's only like this." The excuse of these escort duties is often heard in our actual production. Will not always use another angle to sum up our problems? What should be done will be better. The print industry has a lot of suddenness: weather problems; machine problems; auxiliary materials problems; version problems and so on. There are too many problems that we cannot expect to change. The only thing that can change is our operating habits. Summarize a little more; ask more questions why; more to overcome; use a little more to do things. It will be more successful and more rewarding.
Source: Printing Technology
Types of brushes.There are so many many brushes:washes/glazes, rounds, flats, filberts and liners and more. Choosing the right type for the technique is important. Let`s look at the different types.Flat Brushes-Flats are brushes with a straight chisel edge and square shaped filaments. These can be known as shades if they`re in smaller sizes and washes/glazes if in bigger sizes. Large areas are painted with a wash/glaze brush whereas smaller flats are used for small areas of painting. Round brushes-Round brushes have a large diameter of the ferrule, more so than a liner, which can be used for applying thick to thin lines, filling in odd shaped areas, painting details and work great for lettering. Liners don`t hold as much paint as a round, however, they are super great for creating lines or curves. Script liners are similar to liners but the filaments are much longer and hold more paint. A round brush tapers to a pointed tip – several types of rounds are referred to rounds, liners or script liners. Angle brushes are filaments that have been cut on an angle – these are excellent to use in small or curved areas of the painting.Filberts Brushes with oval shaped filaments are known as filberts in smaller sizes and oval wash in larger sizes. Both shapes can be used for base coating, stroke work and more. There are filbert combs, filbert wash and more.Mop Brushes,Then there are mop brushes–great for blending and smoothing out small areas. They`re also ideal for applying powdered pigments–just dust them lightly over hot or tacky wax.Specialty Brushes-Then there are all the speciality brushes on the market used for certain techniques and garner their own results–fan, deer-foot, stumbler, mops,stencil and more.
Stencil Brush for Painting, Paint Brush, Boar Painting Brushes
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