Formula and Manufacturing Technology of Adhesive (cooked glue)        The quality of adhesive is closely related to the quality and dosage of starch, which has a very direct impact on the packaging and printing industry.Formula and Manufacturing Technology of Adhesive (cooked glue) Paste:Formula and Manufacturing Technology of Adhesive (cooked glue)       Industrial caustic soda (NaOH) there are crystalline, rod-shaped, flake and 30% NaOH aqueous solutions. As long as the purity is qualified, caustic soda in any state can be used. The amount of caustic soda is added to oxidized starch and stirred for 20 minutes until the starch solution is translucent paste. Formula and Manufacturing Technology of Adhesive (cooked glue)        The amount of caustic soda is too large, the glue solution has high fluidity, good transparency and long storage time, but the alkali content in corrugated peak sizing will also increase The corrugated box is easy to turn yellow, causing the ink on the surface of […]

Influence of Paper and Ink Characteristics On Dot Expansion        For dot image printing, although dot expansion is inevitable, how to effectively control dot expansion to make it within the normal specified range is the guarantee to improve the quality of printed matter. Generally speaking, the 50% dot gain value specified in the printing requires that fine products should be < 12% and general products should be < 18%. Influence of Paper and Ink Characteristics On Dot Expansion        Once it exceeds this range, there will be quality problems such as printing tone loss, density increase, color change and so on. In the prepress production and printing process, certain compensation will be made for the normal dot increase, but the abnormal dot increase is often irregular. Influence of Paper and Ink Characteristics On Dot Expansion        In this way, reasonable compensation can not be made in the prepress production process, but can only be controlled in the printing process. The […]

Dot Transfer Law of Flexographic Printing       In the packaging and printing industry, a variety of flexible printing are often used.Dot Transfer Law of Flexographic Printing 1. Reasons for network expansion        Dot expansion in printing is inevitable. There are two main reasons for dot expansion: one is physical or mechanical. At the moment of embossing, the ink on the printing plate dot will deform due to extrusion, resulting in dot expansion;Dot Transfer Law of Flexographic Printing       Another reason is optical, that is, dot enlargement is caused by the reflection of light. Light is scattered at the edge of dot ink film, resulting in considerable dot enlargement in vision. Optical dot expansion depends on the transparency of ink and the smoothness and absorption of paper.Dot Transfer Law of Flexographic Printing   2. Flexo dot transfer law         In flexographic printing, due to the large elasticity of the photosensitive resin plate used and the need to apply a certain print […]

Tips And Answers For Using Ink         Composite ink has no problem in printing, but there are white spots in composite aluminized film, and the covering power is greatly reduced. How to deal with the above problems?Tips And Answers For Using Ink        First, increase the amount of coloring material in the ink; Secondly, alcohol ether solvent or leveling agent is introduced in the formulation design; Third, increase the amount of antistatic dispersant or auxiliary resin with low viscosity;Tips And Answers For Using Ink         Fourth, when printing, move the scraper upward a little or increase the printing pressure appropriately. You can also change the printing plate with deep hole to improve the thickness of ink film and promote the wetting and leveling of ink.Tips And Answers For Using Ink  Surface printing ink is not inked when printing. How to deal with it?Tips And Answers For Using Ink        The ink does not adhere to the substrate, indicating that the formulation design of the […]