Use of water-based ink

Water-based ink composition:
Pigment: provides color to provide color and color density, can not be directly attached to the paper resin (Resins): a sticky and shiny, used to carry disperse pigments, provide ink strength and hardness, the only part of the ink chemical reaction .
Solvent: dissolves the resin, assists in controlling viscosity and drying speed.
Water: A solvent used to dilute the ink to the upper viscosity.
Additives: Hodifier controls friction coefficient and abrasion resistance, Defoamers control foam, Amine soluble resin, viscosity control and drying speed....
※ All of the water-based inks contain the above ingredients, and can be used as part of the composition for each printing requirement called <Printability>

※ The use of ink - pH value, viscosity in the recent work, to improve the efficiency of the water-jet printing mill and the drag and drop problems of rolling. Problems have also been raised in many factories regarding the pH, viscosity and surface tension of aqueous inks.
Water-based ink is a chemical product. It is synthesized from water, pigments, resins, and amine water mixed into latex. It is pumped out of the ink tank into the ink-transfer system. In the production process, it is expected that the water-based ink viscosity (concentration) range can be controlled stably, so that the product can reduce the occurrence of chromatic aberration. However, after tens of minutes, the pigment begins to precipitate due to the slow ambient temperature environment, but water, resin, The gradual evaporation of the amine water will cause the aqueous ink to thicken and even solidify.
Therefore, the operator thinks that the ink is thickened and diluted with water. Although we require the correct hue in the process, we will lose the hue in the operation of the machine due to the continuous addition of water. Therefore, we need to add resin and amine water to the aqueous ink to improve it.
Many paper packers have also started to measure the initial viscosity and pH of new inks. The pH value range of the ideal new ink is 8.3~9.5, but due to the high pH value of the coated paper and the low number of ink lines, the anilox roller should pay attention to the application of increasing the pH value.
Therefore, the viscosity will affect the pH and the pH will also affect the viscosity. If the viscosity rises, the pH will begin to drop, then the printing plate will start to remain pigment, and the grid holes in the pattern will clog. This is why we often see the quality of the production will be uneven coating, leaving a small amount of ink transfer Imprinted on the object to be printed, this is the effect of too low pH. If water is added, the pH value of the water-based ink will be reduced (because the pH of the water is 7), which makes it difficult for the pigment to re-wet and the ink in the anilox roll is difficult to reach the plate.
Transferability is controlled by surface tension, and the ink itself does not flow from this surface to the other surface unless the new surface tension is greater than the surface tension to be removed. If the water-based ink contains too much water to increase the surface tension, it is difficult to attach the pattern roller, and splashing may occur when the printing speed is high.
Water will reduce the pH of water-based ink (pH of water is 7) and cause negative effects. For example, if the ink is accelerated, the ink will deposit on the printing plate. When the pH is too low, the viscosity will increase, while the ink is on the pattern roll, printing plate, The drying speed on the board becomes faster, the resin will condense, the ink film will be difficult to be wetted and cleaned, and the printing plate will become dirty and napped.
When the pH is too high, the viscosity will decrease, the drying time will increase, and the ink film will become softer. The printing plate and the pattern are easier to clean, and are more suitable for printing on coated paper.
In the case of high-line printing, since the dot area is small, the pH is relatively high. Therefore, it is recommended that you have a high pH and reduce the number of dots when printing the first color. Examples are as follows:
First color: 9.2 pH, second color: 9.0 pH, third color: 8.8 pH, fourth color: 8.6 pH, fifth color: 8.4 pH Establishing the interrelationship of the pH values ​​of the machines is helpful. However, the pH of the paper surface also increases as the pH of the aqueous ink increases.
Most ink suppliers supply two different products to avoid the problem of pH values ​​that cannot be controlled after aqueous inks are added to water. Both of these products are very effective for the control of printability as additives (non-pigmented inks) and pH adjusters (amine waters).
The most important conclusion is not to use water to adjust the color density, which will increase the surface tension, and the transfer capacity will not be able to reach the original design. Therefore, lowering the pH after adding water also causes problems with aqueous ink.
The conditions that cause problems with aqueous ink are:
(a) Ink content, number of doctor blades, type of doctor blade, middle height and hardness of rubber squeegee, (b) ink transfer ability of printing plate, embossing area, and surface roughness of printing surface (c) Machine contact adjusted ink Pressure, printing pressure, printing speed (d) The pH value of the paperboard surface after processing is acidic or alkaline, paperboard temperature, paperboard humidity (e) paper color, ink absorbency (f) working environment temperature ,Relative humidity

Source: Printing Industry

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