Discussion on the process of printing nameplate of

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In order to meet the needs of all levels of commodity packaging, the application of packaging and printing nameplate products transferred under normal pressure in dial, electrical appliances, dial, panel, automobile, machinery and other industries is becoming more and more mature. After long-term production practice, the author has formed a variety of stereotypes technology. For these products, we should not only consider the scientific nature of the nominal and the modernity of the face decoration art, but also consider the practicality and economy of different commodities, closely focus on the continuous expansion of basic materials and the continuous improvement of technological means (silk printing, rotogravure printing and lithography/paper, synthetic paper, plastic, metal foil, etc.), and strive to make the production process of products simpler and reduce costs, It can also improve the quality of its products. Now we talk about the following key points of technology on the production method of its soft (paper, plastic, etc.) nameplate, and sincerely hope that colleagues in the packaging and printing industry will make criticism and suggestions

I. key points of process

① design (I) layout specification → plate making/slightly larger graphic version (reinforcing layer) → blanking I/paper or plastic sheet → coating with reinforcing layer coating/slightly larger graphic version → drying or drying/standby

② design (II) according to commodity requirements → plate making/graphic color plate. The important reason is the lack of standardization → adjusting ink/printing positioning → drying or drying for use

③ design (III) according to the first and second specifications → plate making/adhesive layer plate → adjusting the glue/adhesive layer coating → printing → drying or drying/standby

④ design (IV) blanking according to design (I) → bonding/printing and anti sticking materials → cutting II/cutting of finished products → packaging and warehousing/for sale

note: I is a graphic carrier; II is the graphic protective film bonding carrier

in order to achieve the transfer effect, whether we use silk printing, intaglio printing or lithography, except that the enhancement layer is slightly larger than the specification of 0.5-1mm of the text, the accuracy of each printing process should not exceed 0.1-0.2mm. Otherwise, ensuring the product quality of the product and expanding the application scope of flexible packaging printed nameplate will become empty talk. In this regard, the author introduces in detail the production process of atmospheric pressure transfer printing of commodity packaging printing products, in order to achieve the scientific and economic practicality of high added value to improve the printing quality

II. Examples of silk screen or gravure printing production process

① printing carrier: paper or polyester, poly nameplate schematic diagram B, poly propylene material

operating procedures: remove dust to avoid affecting the ink layer of coating printing, silk screen printing or gravure printing, and avoid no bright gloss of graphics and texts; Coating method/spray or wipe the liquid debonding agent to enhance the uniform waterproof, solvent proof and acid-base immersion of the coating, especially the film removal transfer effect (the genuine rate is 95-100%)

② example of preparation of reinforcement coating: pH of rubber = about 6.5

in the process of modulation, it can be as thick and less viscous as possible, but the shorter the wire head, the better, especially not clear with the ink (it should be slightly sticky); Formula design: thermoplastic resin solution 25-30%, 107 glue 68-72%, thickener 2-50%, anti-aging agent 0.5-10%, total: 100%

stir the above to milky white to form an antioxidant reinforcement coating. At the same time, it should be noted that when there is too little thermoplastic resin solution, the reinforcing layer is easy to be hydrophobic and shrink into pinholes or the printing edge becomes a sawtooth shape. On the contrary, after the thermoplastic sensor resin liquid is excessive, the rubber is acidic and rainy, and it is not easy to control silk screen printing or gravure printing to enhance the consistency of the thick film of the coating layer. Secondly, it will directly affect the authenticity rate of atmospheric pressure transfer printing, which is the key of the technology. On this basis, we strive to achieve that the enhancement layer is slightly larger than the image and text by 0.5-1mm

③ printing ink, silk or gravure printing ink with thermoplastic resin as binder is preferred

operating procedures: in the printing process, the phenomenon of bottom leakage (whitening) can be avoided as much as possible. We know that the bottom leakage fault is usually caused by insufficient or excessive pressure. Sometimes ink coarse impurities will also lead to its density difference is not full. This kind of failure often determines the success or failure of transfer printing. That is to say, when the adhesive coating is printed, it is very easy to penetrate or directly Miss printing and bite the ink into the reinforcing layer or carrier, which seriously hinders or destroys the graphic ink film, so it should be paid attention to as the second key of the technology

④ white cover (or yellow, etc.), that is, the higher the coverage rate, the better, and the ink that does not turn yellow or gray. The scientific nature of this technology is to use the same property and energy as the ink

operating procedures: the purpose of white covering is very simple. First, to improve the density of silk printing or gravure printing and achieve high quality. High price packaging and printing nameplate products; The second is to improve the resolution of the ink and the smoothness (mirror) of the silk screen or gravure printing of the adhesive layer, so as to facilitate the smooth progress of the next process, and use it after the printing price rises and then rises, brush the cover and dry it

⑤ adhesive layer, aiming to achieve the adhesion rate of silk or gravure transfer objects

operating procedures: when using unsaturated adhesive layer, it should be aimed at its oil degree, viscosity, silk head, etc., which will hinder the effect of silk screen printing or gravure printing. Generally, the solvent should be selected in the following order for necessary dilution adjustment: ethanol isopropanol n-butanol cyclohexanone, etc. after selection, put the adhesive into the adjustment. The length of the diluted rubber silk head and the order of drying speed are: ethanol, isopropanol, n-butanol. Cyclohexanone and so on. Sometimes the plasticity can be improved by adding mineral oil. Generally, it should be understood that the material cannot be miscible with the white layer and become waste

in addition, in the process of printing the adhesive layer, we should pay attention to neither over coating nor bottom leakage, and often install a splitter plate (sleeve), otherwise it is not difficult to transfer completely, or it is difficult to transfer to the part of the commodity packaging under normal pressure. At the same time, the adhesion fastness of the adhesive layer is the key technology of printing in the operating procedures

in the study of the structure of atmospheric pressure transfer and packaging printing products, the author believes that the addition of different tackifiers is one of the effective measures to improve the success or failure of the adhesive layer. In other words, different tackifiers should be used for different flexible packaging printing nameplates, otherwise it will not meet the user's transfer technology operation. For example, we can meet the transfer (bonding) requirements of non-polar polymers by adding poly (. Diene) pre olefin resin or dimer Ben rosin ester. Therefore, the author believes that this is the key of the technology

⑥ anti stick coating and carrier, a brief description

as the anti sticking layer, i.e. the cutting, blanking and edge cleaning requirements of the carrier for the printed graphic specifications of both paper and plastic after the completion of the same with its carrier and the packaging of goods, whether it is a single graphic or a multi-color mosaic silk plate or gravure printing, the anti sticking layer strives to smoothly achieve the ultimate goal of rapid adhesion without re adhesion or extremely difficult to transfer and remove the graphic ink film, so as to achieve the technical standard

in the normal pressure transfer packaging printing nameplate, according to the characteristics and characteristics of the product, one has the advantages of light weight, low cost and high work efficiency. The paper is abrasion resistant, not easy to corrode, easy to process and can be transferred and pasted on non planar bodies. Plastic, aluminum and other synthetic materials will spring up in front of people like flowers blooming after a spring rain

information source: Interconnection

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